A SYSTEM AND A METHOD FOR ONLINE MEASUREMENT OF FLUE TEMPERATURE OF COKE OVEN

FIELD OF INVENTION:
[001] The present subject matter described herein, relates to a system and method for online measurement of Flue temperature of the coke ovens heating wall. The present subject matter, in particularly, relates to a system and method for online measurement of plurality of flues of the coke oven using single pyrometer.

BACKGROUND AND PRIOR ART AND PROBLEM IN PRIOR ART:
[002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[003] The coking oven battery is heated by vertical heating walls which can consist of up to 32 heating flues, located between each oven chamber. Heat is transferred from the walls to the center of the oven, whereby the coal is converted into coke during the coking process and solidifies away from the oven walls. To achieve efficient coking of the coal, an optimal heat distribution must be ensured over the entire heating wall. This is done by adjusting the amount of heat. Any residue and deposits on the heating walls can not only have a negative effect on the quality of the coking process, but can also result in production losses and high costs on a restart.
[004] Accurate control of the supply of heat and monitoring of the temperature distribution in the heating walls throughout the whole production process are therefore essential and objective. The battery consists of a large number of refractory bricks which, together, have a great heat capacity. As a result of this, the results of a particular heating interruption are not immediately visible but only show up after some time heating up of a coke battery is done by feeding in a specific quantity of gas. The burning of this gas produces heat (energy). The energy also disappears again from the battery; otherwise, the battery would maintain its temperature without heating. When no ovens are being pushed and charged the battery only requires to be heated to upto 50%. If more heat is provided than required, the battery becomes hotter. On the other hand, if less heat is provided than required, the battery gets colder.
[005] The temperature of the battery is the result of the difference between the incoming and outgoing energy flows. If exactly the same amount of energy is supplied as it disappears, then the battery temperature remains constant. If there is any unbalance creates due to variation of operating parameter or input material parameter to the battery, same unbalance has to be identified and required heat to be supplied to the battery.
[006] Therefore, it is required to optimize the heat input as required at any instant of time. Supplying heat as per requirement maintain the heat balance of the system. The relevant temperature measurements are made in the heating walls of the adjacent coke ovens directly from the furnace cover after opening the heating flue ports.
[007] In the existing technologies, the temperature recording is carried out alternately as a longitudinal or transverse measurement. During a transverse measurement, several heating walls are usually measured and recorded as series of measurements. In this way, in a transverse measurement 45 heating walls can be measured in 2 stages (45*2 values). So, at list 90 measurements are required per block. In cross battery, three 3 measurement per wall is required. In the current time, worldwide in coke making technology temperature are measurements are done manual by different type of devices.
[008] Therefore, there is need to develop a system and a method that can measure the temperature of plurality of flues of the coke oven instantly at a same time instead without approaching each flue of the coke oven. More important is safety and manpower utilization. Additionally now it is being done only three times in 24 hours. They don’t have any means to know the temperature change before 8 hours. One more point, present level- 2 heating model works on the feedback from regenerator temperature which is delayed information due to lot of inertia in the system. This would provide real-time thermal information of the wall.
[009] The information disclosed in this background of the disclosure section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

OBJECTS OF THE INVENTION:
[0010] It is therefore the object of the present subject matter to overcome the aforementioned and other drawbacks in prior method/product/apparatus.
[0011] The principal objective of the present subject matter is to develop a system and a method to measure online measurement of flue temperature of coke oven having a plurality of flue.
[0012] Another object of the present subject matter is to develop a system having single pyrometer to measure to temperature of plurality of flues of the coke oven.
[0013] Another object of the present subject matter is to develop a system based on fiber optics to measure temperature having of plurality of flues of the coke oven from a distance.
[0014] Yet another object of the present subject matter is to provide protection to the fiber optics provided in the plurality of flues.
[0015] Yet another object of the present subject matter is to provide a system based on programmable logic controller to control movement of the pyrometer head.
[0016] Yet another object of the present subject matter is to provide a system that provides safety and manpower utilization.
[0017] Yet another object of the present subject matter is to provide a system to store calibration data of each flue from the plurality of flues of the coke oven into memory of programmable logic controller.
[0018] These and other objects and advantages of the present subject matter will be apparent to a person skilled in the art after consideration of the following detailed description taken into consideration with accompanying drawings in which preferred embodiments of the present subject matter are illustrated.

SUMMARY OF THE INVENTION:
[0019] One or more drawbacks of conventional system for measurement of temperature of plurality of flue of coke oven, and additional advantages are provided through the method as claimed in the present disclosure. Additional features and advantages are realized through the technicalities of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered to be a part of the claimed disclosure.
[0020] The present subject matter relates to a method and a system to for online measurement of flue temperature of coke oven having a plurality of flue.
[0021] In an embodiment, the present subject matter discloses a system for online measurement of flue temperature of coke oven having a plurality of flue. The system comprises a fiber optic system and a pyrometer based temperature measurement system. The fiber optic system capture Infrared Radiations (IR) from the plurality of flue. The fiber optic system includes a fiber optic provided in each of the plurality of flue. Further, a lens is provided at one end of the fiber optic to capture Infrared radiations (IR) from base of each of the plurality of flue and transmit the captured IR radiation to other end provided at a center location. Where the center location consists of a base plate having the other end of the fiber optic from each of the plurality of flue. The pyrometer based temperature measurement system includes a pyrometer provided on a platform movable by servo motors in three axes (X, Y, Z), where a programmable logic controller (PLC) is provided to control movement of the platform in predefined path by the servo motors. The programmable logic controller (PLC) moves the platform equipped with the pyrometer on the base plate having other end of the fiber optic from each of the plurality of flue. The pyrometer based temperature measurement system has a fiber optic with coupling lens is provided on the pyrometer to transfer the captured Infrared Radiations (IR) from the plurality of flue to the pyrometer. The pyrometer based temperature measurement system measures temperature of the plurality of flue based on the captured Infrared Radiations (IR).
[0022] In an aspect, length of the fiber optic from each of the plurality of flue to the base plate is different.
[0023] In an aspect, the pyrometer based temperature measurement system includes calibration data for the each of fiber optic for the plurality of flue is stored in memory of the programmable logic controller (PLC) and upon contacting of the fiber optic of the pyrometer with the other end of the fiber optic provided on the base plate. Further, the pyrometer based temperature measurement system calculates the temperature of the plurality of flue based on the corresponding calibration data of the fiber optic stored in the PLC.
[0024] In an aspect, focal length of the lens provided at one end of the fiber optic is calculated based on distance between the one end of the fiber optic and base of the flue.
[0025] In an aspect, the fiber optic system includes a purging jacket with ceramic tube is provided at top of each of the plurality of flue, where the fiber optic is provided along central axis of the purging jacket of ceramic tube in the plurality of flue.
[0026] In an aspect, the air gas is purged into the purging jacket with ceramic tube at slow flow rate and the purging jacket is made of metal.
[0027] In an aspect, the base plate is provided closer to the pyrometer based temperature measurement system.
[0028] In an aspect, the base plate defines the other end of the fiber optic from each of the plurality of flue in the three axes (X, Y, Z).
[0029] It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined to form a further embodiment of the disclosure.
[0030] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS
[0031] It is to be noted, however, that the appended drawings illustrate only typical embodiments of the present subject matter and are therefore not to be considered for limiting of its scope, for the invention may admit to other equally effective embodiments. The detailed description is described with reference to the accompanying figures. In the figures, a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and components. Some embodiments of system or methods or structure in accordance with embodiments of the present subject matter are now described, by way of example, and with reference to the accompanying figures, in which:
[0032] Fig. 1 illustrates system with fiber optics and pyrometer, in accordance with an embodiment of the present subject matter;
[0033] Fig. 2 illustrates base plate with three axes movement, in accordance with an embodiment of the present subject matter;
[0034] Fig. 3 illustrates stain less steel purging jacket with ceramic tube, in accordance with an embodiment of the present subject matter;
[0035] Fig. 4 illustrates installation of cover provided on a plurality of flues in the coke oven, in accordance with an embodiment of the present subject matter; and
[0036] Fig. 5 illustrates Graphical User Interface with online temperature of the plurality of flues, in accordance with an embodiment of the present subject matter.
[0037] The figures depict embodiments of the present subject matter for the purposes of illustration only. A person skilled in the art will easily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

DESCRIPTION OF THE PREFERRED EMBODIMENTS:
[0038] While the embodiments of the disclosure are subject to various modifications and alternative forms, specific embodiment thereof have been shown by way of example in the figures and will be described below. It should be understood, however, that it is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternative falling within the scope of the disclosure.
[0039] The terms “comprises”, “comprising”, or any other variations thereof used in the disclosure, are intended to cover a non-exclusive inclusion, such that a device, system, assembly that comprises a list of components does not include only those components but may include other components not expressly listed or inherent to such system, or assembly, or device. In other words, one or more elements in a system or device proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or device.
[0040] Coke is made in an oven sandwiched within two heating walls. These walls consist of channels, where gas is burned. For efficient coking, optimal heat distribution over the entire heating wall to be ensured. If not, coking process would be impacted, production loss and higher cost for restart would occur. Thus it is essential to measure temperature to control the heating. In the existing system, measurement is done manually in 3 shifts by 3 persons daily, directly from the furnace top by opening the flue caps, irrespective of weather condition, in presence of carcinogenic fumes, heavy dust and extreme heat. It was a repetitive unskilled job. Only the position changes and temperature is being measured in the same way.
[0041] To overcome above mentioned technical problem, the present subject matter provides a method and system for online measurement of flue temperature of coke oven having a plurality of flue. The present method and the present system to measure online temperature of coke oven at a distance with a fiber optic as explained in the figure 1. The present system 100 uses a single pyrometer and multiple fiber optics to measure temperature from a distance. There is no need of manual intervention to measure the temperature therefore, safety of human beings are also ensured.
[0042] The present system gets embedded in the online temperature measurement of the flue of coke ovens heating walls. The present system would enable the operation team to have a more current visualization of the flue temperature. Accordingly, the operation team can have instantaneous process temperature. Unlike earlier, where the team has to wait for the entire shift (8 hours) or day to know the temperature of flues of the coke oven. Ultimately the present system enables a new heating model which presumably would be able to provide more accurate and faster 'Pause time prediction'. 'Pause time' is the KPI which determines the usage of gas or fuel to run the coke oven battery efficiently. It will also affect the environment. The present coke ovens heating model relies on re-generator thermocouple data. Re-generator is a big thermal capacitor where the temperature information would have high inertia. Based on these signals the present heating model works. The output of the heating model is the set-point for 'Pause Time'. Pause time is the time, during which no heating takes place. In coke oven heating cycle is alternatively changed from one side to another after a brief time gap or Pause. This time gap or pause is known as Pause time. If the Pause time is increased, fuel savings would occur, but bigger time gap would have detrimental effect on the coke quality and refractory.
[0043] So an optimized pause time is calculated using mathematical modelling by taking input from regenerator thermocouple values. As explained earlier, regenerator is a huge thermal capacitor, so the change in temperature is sensed at a delay to the thermocouples. If latest and near process data of temperature is available, it would reflect the more current scenario of the process. Eventually if these signals are taken for the calculation of pause time, it would provide a much better output in terms of accuracy and quickness. The change or control action would also be faster, resulting in quicker and efficient process control. This will have a direct correlation with environment pollution. Lesser the fuel burnt, lesser pollution would occur in environment without compromising coke quality.
[0044] The present system provides latest and near process data of temperature for effective calculation of pause time.
[0045] It should be noted that the description and figures merely illustrate the principles of the present subject matter. It should be appreciated by those skilled in the art that conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present subject matter. It should also be appreciated by those skilled in the art that by devising various arrangements that, although not explicitly described or shown herein, embody the principles of the present subject matter. Furthermore, all examples recited herein are principally intended expressly to be for pedagogical purposes to aid the reader in understanding the principles of the present subject matter and the concepts contributed by the inventor(s) to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions. The novel features which are believed to be characteristic of the present subject matter, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures.
[0046] These and other advantages of the present subject matter would be described in greater detail with reference to the following figures. It should be noted that the description merely illustrates the principles of the present subject matter. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described herein, embody the principles of the present subject matter and are included within its scope.
[0047] Referring to Figure 1 illustrating a system 100 for online measurement of temperature of plurality of flues of coke oven. The present system 100 includes a fiber optic system and pyrometer based temperature measurement system which is coupled to a display unit to display information of real time temperature of flue. The fiber optic system comprises a fiber optic 103 provided in each of the plurality of flue 101. The fiber optics 103 are used to carry the Infrared radiation from a harsh environment to a safer place into the electronics to measure the temperature. Each flue from the plurality of flue 101 has a fiber optic 103 to transmit the Infrared radiations. Individual fibers are calibrated with the transmitters from the factory end and calibration data is saved in the PLC. This is done to nullify any deviation in measurement.
[0048] Each fiber topic 103 is provided to capture the infrared radiation from each flue and transmit the same to the central location. A lens is provided at one end 103a of the fiber optic 103 to capture Infrared radiations (IR) from base of each of the plurality of flue and transmit the captured IR to other end 103b provided at a center location. The center location consists of a base plate 104 having the other end 103b of the fiber optic 103 from each of the plurality of flue. Each fiber optic head is equipped with the lens having focal length calculated based on the distance from the fiber optic tip to the burner of the flue 101 for seamless transfer of Infrared radiation from flue base to the fiber head. With this, the basic problem of capturing IR radiation from multiple points to a central location has been resolved. Though it was a challenge to protect the lens tip from the extreme hash environment of the flue zone as well as to maintain cleanliness of the fiber optic 103.
[0049] To protect the fiber tip from the extreme harsh environment of the flue zone as well as to maintain cleanliness of the fiber tip. A special purging jacket made up of ceramic tube is provided at top of each of the plurality of flue 101. Further, the ceramic tube is stainless steel coupled. The fiber optic 103 is provided along central axis of the purging jacket of ceramic tube in the plurality of flue 101. The ceramic tube holds the fiber optic 103 along the central axis and air is purged into the ceramic tube at very slow flow rate to create a positive pressure in the ceramic tube and around the tip of the lens. This solved both issues, maintained positive pressure within the ceramic tube, thus preventing ingress of dust, flame into the lens tip as well as ensuring required thermal protection for the sustenance of the glass lens tip. To prevent damage to fiber optic laid over the furnace top, the fiber optic 103 is passed through protective conduits. In another embodiment, the ceramic tube is provided in the stainless steel purging unit.
[0050] The pyrometer based temperature measurement system uses single pyrometer to measure temperature of all plurality of flues of the coke oven. The pyrometer based temperature measurement system includes a pyrometer 106 provided on a platform 107 movable by servo motors in three axes (X, Y, Z). A programmable logic controller (PLC) is provided to control movement of the platform 107 in predefined path by the servo motors. The programmable logic controller (PLC) moves the platform 107 equipped with the pyrometer 106 on the base plate 104 having other end 103b of the fiber optic 103 from each of the plurality of flue 101. Further, a fiber optic 105 with coupling lens is provided on the pyrometer 106 to transfer the captured Infrared Radiations (IR) from the plurality of flue to the pyrometer 106. The pyrometer based temperature measurement system measures temperature of the plurality of flue based on the captured Infrared Radiations (IR).
[0051] Working/movement of platform: Using a set of servo motors and a micro PLC a repetitive fixed path movement of the head having the pyrometer 106 is ensured. In the head with the pyrometer 106, a fiber optic 105 with coupling lens is provided with other end fixed to the pyrometer 106. The other end 103b or fiber heads of the fiber optic 103 from the plurality of flue 101 are properly installed into the base plate 104. When the moving head with the pyrometer 106 meets the other end 103b of the fiber optic 103 provided in the base plate 104, the fiber optic 105 transfers the captured IR occurs from the flue 101 to the pyrometer 106. In each cycle the fiber head of the fiber optic 105 with a coupling lens, comes in direct optical contact with the other end 103b of the fiber optic 103, takes the captured IR and transfers the captured IR to the pyrometer 106. Based on the captured IR, the pyrometer based temperature measurement system measures the temperature of the corresponding flue. After measuring temperature of one flue, the head with pyrometer 106 moves to next position, i.e., next other end 103b of the next fiber optic 103 coming from next flue 101. A sufficient waiting time for the fiber optic 105 with coupling lens is provided at a particular port location, thus enabling enough and proper transfer of captured IR from field (flue base) to the pyrometer 106 for accurate measurement of temperature.
Next technical problem solved by the inventors is the calibration of data from the multiple fiber optic with variable length. As the coke oven has multiple flues for example 1440 flues, the fiber optic 103 from each flue has different length to the base plate 104. For example, the fiber length varied from 9 meters to 24 meters in the present system. To ensure same calibration for all fiber optics for the same object temperature, the calibration data for the each of fiber optic 103 for the plurality of flue 101 is stored in memory of the programmable logic controller (PLC) instead of memory of the pyrometer 106. Ideally OEMs store the calibration data into the hardware memory of the pyrometer. Here in the present case, it is not possible to store different calibration data for each fiber optic in the pyrometer therefore, the calibration data is stored in the memory of the PLC. Storing the calibration data into the memory of the PLC provide options for scalability of the system to increase number of flues to measure temperature. Therefore, shifting the calibration data from the pyrometer memory into the PLC memory, where the calibration data is embedded into each channel. So whenever a particular port or point is being measured, its exclusive calibration data would be utilized to arrive at the measured temperature for that particular fiber length. This was achieved by using same object temperature utilizing a black body source as the reference.
[0052] With the present system, temperature of each of the flue in the coke oven is measured online and displayed into the display device connected to the system as shown in the figure 5. Based on the displayed temperature, the operation team can calculate the Pause Time for effective utilization of the coke oven. The present system enable continuous online temperature of the flues helping operators for efficient control the battery performance. This will enable to achieve total man-less operation of a harsh environment.
Installation of the present system:
[0053] To install the present system, plica conduits are used. Those were again protected by hypro jackets. These were laid underneath the rail tracks to protect against any mechanical damages. Airline was laid along with the fiber channels. Referring to figure 3 and 4, this airline was tapped at each port to connect it to the purging jacket which was inserted inside the Flue chamber. Each was equipped with a ball valve to control the flow of air passing into the flue. This air would provide cooling required for the glass lens, it would maintain the cleanliness of the lens and it would prevent the flame to reach the glass lens.
[0054] The major challenge was to calibrate the multiple fibers with the same sensors. Traditionally in instrumentation it is the practice to calibrate a single fiber with a single pyrometer to achieve accurate temperature reading. The radiation loss /gain should be constant along the fiber. Here in the present system there is multiple fibers. Further, each and every fiber has to calibrate with the transmitter so that for a said object temperature, reading from a fiber of length 10 meters should be same as that of 15 meters and 20 meters. To achieve this, shifting the calibration data from the pyrometer hardware to the micro PLC is opted which is acting as the central nervous system of the present system.
[0055] The memory of the PLC has a lookup table of calibration data for each and individual channel, so whenever the head moves to a particular channel its calibration data would be activated and accurate temperature would be sent to the next level. So the scaling would take place in the PLC rather than at pyrometer.
[0056] The next challenge is to protect and sustain the glass lens at extreme temperature and harsh environment within the flue cap. Another challenge was to focus the lens just at the measurement point beside the burner which was 6.5 meters below the flue cap. This was overcome by meticulously designing the lens focal length and machining the flue to fit the probe just at center so that no misalignment could take place. The challenge of flame, heat and dust was overcome by using a ceramic tube fitted in stainless steel purging unit. This was put centrally in the flue cap. Air was connected to the purging unit, which maintains flow of Nitrogen to lens body. These actually helped overcome two challenges simultaneously, protection of lens against extreme heat and flame and it helped to maintain a positive pressure inside the ceramic tube, which prevented the ingress of dust on the lens thus providing clean aperture always.
[0057] In another embodiment of the present subject matter a method for online measurement of flue temperature of coke oven having a plurality of flue using a system 100. The method includes steps of capturing Infrared Radiations (IR) of the plurality of flue a fiber optic provided in each of the plurality of flue and transmitting the captured IR radiation to other end of the fiber optic provided at a center location. Where the center location consists of a base plate having the other end of the fiber optic from each of the plurality of flue. Further, the other end of the fiber optic provided on the base plate is contacted with one end of a fiber optic equipped with a pyrometer provided on a platform () movable by servo motors in three axes (X, Y, Z) of the base plate. A programmable logic controller (PLC) is provided to control movement of the platform in predefined path by the servo motors. Further, the pyrometer receives the captured Infrared Radiations (IR) from the other end of the fiber optic provided in the base plate and calculates temperature of the plurality of flue based on the captured IR.
[0058] Further, upon contacting of the fiber optic of the pyrometer with the other end of the fiber optic provided on the base plate, calculating the temperature of the plurality of flue based on the corresponding calibration data of the fiber optic stored in the PLC.
[0059] In an aspect, focal length of the lens provided at one end of the fiber optic is calculated based on distance between the one end of the fiber optic and base of the flue.
[0060] In an aspect, calibration data for the each of fiber optic for the plurality of flue is stored in memory of the programmable logic controller (PLC).
[0061] It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances, where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”
[0062] It will be further appreciated that functions or structures of a plurality of components or steps may be combined into a single component or step, or the functions or structures of one-step or component may be split among plural steps or components. The present invention contemplates all of these combinations. Unless stated otherwise, dimensions and geometries of the various structures depicted herein are not intended to be restrictive of the invention, and other dimensions or geometries are possible. In addition, while a feature of the present invention may have been described in the context of only one of the illustrated embodiments, such feature may be combined with one or more other features of other embodiments, for any given application. It will also be appreciated from the above that the fabrication of the unique structures herein and the operation thereof also constitute methods in accordance with the present invention. The present invention also encompasses intermediate and end products resulting from the practice of the methods herein. The use of “comprising” or “including” also contemplates embodiments that “consist essentially of” or “consist of” the recited feature.
[0063] Although embodiments for the present subject matter have been described in language specific to structural features, it is to be understood that the present subject matter is not necessarily limited to the specific features described. Rather, the specific features and methods are disclosed as embodiments for the present subject matter. Numerous modifications and adaptations of the system/component of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover all such modifications and adaptations which fall within the scope of the present subject matter.

We claim:
1. A system (100) for online measurement of flue temperature of coke oven having a plurality of flue (101), the system (100) comprising:
a fiber optic system to capture Infrared Radiations (IR) of the plurality of flue (101), the fiber optic system comprising:
a fiber optic (103) provided in each of the plurality of flue (101);
a lens is provided at one end (103a) of the fiber optic (103) to capture Infrared radiations (IR) from base of each of the plurality of flue (101) and the fiber optic (103) transmits the captured IR radiation to other end (103b) provided at a center location, where the center location consists of a base plate (104) having the other end (103b) of the fiber optic (103) from each of the plurality of flue (101);
a pyrometer based temperature measurement system comprising:
a pyrometer (106) provided on a platform (107) movable by servo motors in three axes (X, Y, Z), where a programmable logic controller (PLC) is provided to control movement of the platform (107) in predefined path by the servo motors;
the programmable logic controller (PLC) moves the platform (107) equipped with the pyrometer (106) on the base plate (104) having the other end (103b) of the fiber optic (103) from each of the plurality of flue (101);
a fiber optic (105) with coupling lens provided on the pyrometer (106) to transfer the captured Infrared Radiations (IR) from the plurality of flue (101) to the pyrometer (106);
the pyrometer based temperature measurement system measures temperature of the plurality of flue (101) based on the captured Infrared Radiations (IR).

2. The system (100) as claimed in claim 1, wherein length of the fiber optic (103) from each of the plurality of flue (101) to the base plate is different.
3. The system (100) as claimed in claim 1, wherein the pyrometer based temperature measurement system comprises:
calibration data for the each of fiber optic (103) for the plurality of flue (101) is stored in memory of the programmable logic controller (PLC);
upon contacting of the fiber optic (105) of the pyrometer (106) with the other end (103b) of the fiber optic (103) provided on the base plate (104), the pyrometer based temperature measurement system calculates the temperature of the plurality of flue (101) based on the corresponding calibration data of the fiber optic (103) stored in the PLC.
4. The system (100) as claimed in claim 1, wherein focal length of the lens provided at one end of the fiber optic (103) is calculated based on distance between the one end (103a) of the fiber optic (103) and base of the flue (101).
5. The system (100) as claimed in claim 1, wherein the fiber optic system comprising:
a purging jacket (108) of ceramic tube is provided at top of each of the plurality of flue (101), where the fiber optic (103) is provided along central axis of the purging jacket (108) of ceramic tube in the plurality of flue (101).
6. The system (100) as claimed in claim 5, wherein air gas is purged into the ceramic tube at slow flow rate.
7. The system (100) as claimed in claim 5, wherein the purging jacket (108) is made of stainless steel.
8. The system (100) as claimed in claim 1, wherein the base plate (104) is provided closer to the pyrometer based temperature measurement system.
9. The system (100) as claimed in claim 1, wherein the base plate (104) defines the other end of the fiber optic (103) from each of the plurality of flue (101) in the three axes (X, Y, Z).
10. The system (100) as claimed in claim 1, wherein the pyrometer based temperature measurement system is coupled to a display device to display the measured temperature of each of the plurality of flue (101) at a time.
11. A method for online measurement of flue temperature of coke oven having a plurality of flue (101) using a system (100), the method comprising:
capturing Infrared Radiations (IR) of the plurality of flue a fiber optic (103) provided in each of the plurality of flue (101);
transmitting the captured IR radiation to other end of the fiber optic (103) provided at a center location, where the center location consist of a base plate (104) having the other end of the fiber optic (103) from each of the plurality of flue (101);
contacting the other end (103b) of the fiber optic (103) provided on the base plate (104) with one end of a fiber optic (105) equipped with a pyrometer (106) provided on a platform (107) movable by servo motors in three axes (X, Y, Z) of the base plate (104), where a programmable logic controller (PLC) is provided to control movement of the platform (107) in predefined path by the servo motors;
receiving, by the pyrometer (106), the captured Infrared Radiations (IR) from the other end of the fiber optic (103) provided in the base plate; and
calculating temperature of the plurality of flue (101) based on the captured IR.
12. The method as claimed in claim 11, wherein length of the fiber optic (103) from each of the plurality of flue (101) to the base plate is different.
13. The method as claimed in claim 11, wherein calibration data for the each of fiber optic (103) for the plurality of flue (101) is stored in memory of the programmable logic controller (PLC).
14. The method as claimed in claim 11, wherein the method further comprises:
upon contacting of the fiber optic (105) of the pyrometer (106) with the other end (103b) of the fiber optic (103) provided on the base plate, calculating the temperature of the plurality of flue (101) based on the corresponding calibration data of the fiber optic (103) stored in the PLC.
15. The method as claimed in claim 11, wherein focal length of the lens provided at one end of the fiber optic (103) is calculated based on distance between the one end of the fiber optic (103) and base of the flue (101).