Claims:

1. A system (100) for continuous sensing and measuring of temperature of liquid steel, the system comprises:
a lens (114) mounted in a pipe (108), wherein the lens (114) is placed such that infrared radiation (IR) (106) from the liquid steel is at an incident angle to the lens;
an optic fibre (116) connected to the lens (114) at a first end, and further the optic fibre (116) is connected with a processor (118) at a second end, wherein the processor (118) is configured to convert IR (106) into an analog temperature signal;
a filter (120) is coupled to the processor (118), wherein the filter (120) is configured to filter out slag temperature from the analog temperature signal; and
a display (122) coupled to the filter (120), wherein the display (122) is configured to render temperature of the liquid steel.

2. The system as claimed in claim 1, wherein the pipe (108) is hollow within to capture the IR (106).

3. The system as claimed in claim 1, wherein the pipe (108) is made up of mild steel.

4. The system as claimed in claim 1, wherein Nitrogen gas is blown in the pipe (108) to make it free from particles to get obstruction free IR.

5. The system as claimed in claim 1, wherein the lens (114) is provided with a glass protector.

6. A method for continuous sensing and measuring temperature of a liquid steel, the method comprising:
homogenizing the temperature of the liquid steel using argon gas purging;
capturing an infrared radiation (IR) from the liquid steel;
converting the captured IR to an analog temperature signal;
mapping the analog temperature signal to a predefined temperature, wherein the predefined temperature is in range of 1550-16500C;
displaying the temperature of the liquid steel.
7. The method as claimed in claim 6, wherein the temperature of the liquid is compared with a dip temperature, wherein the dip temperature is measured using thermocouple at end of argon gas purging.
, Description:CROSS-REFERENCE TO RELATED APPLICATIONS AND PRIORITY

[001] The present application does not claim priority from any patent application.

TECHNICAL FIELD

[002] The present disclosure in general relates to a system for sensing temperature. More particularly, the present invention relates to a system and method for sensing and measuring temperature of the steel real time during the argon purging process of the steel for homogenization before casting in a continuous casting machine.
BACKGROUND
[003] Presently, liquid steel is purged or rinsed by inert gas like Argon (Ar) by injecting the inert gas into the liquid steel bath. Argon (Ar) gas is preferred for rinsing not only because of its inert nature but its solubility in steel which is low. The rinsing of liquid steel by Argon is performed to obtain homogenous temperature, composition, and promotion of slag metal refining reaction. Further the rinsing of liquid steel helps in floatation and separation of non-metallic inclusions or impurities. In order to maintain the homogenous temperature, composition and promotion of slag metal refining reaction continuous temperature needs to be measured and maintained.

[004] Currently only thermocouple-based temperature measuring device are being used. The drawback of the thermocouple-based devices is that the device gets consumed in liquid bath after one short dip, giving a single reading only. Moreover, there is no measuring or sensing device to know the continuous temperature profile during inert gas/Argon rinsing process in liquid steel.

SUMMARY

[005] Before the present systems and methods to sense and measure temperature of the liquid steel, it is to be understood that this application is not limited to the particular systems, and methodologies described, as there can be multiple possible embodiments which are not expressly illustrated in the present disclosure. It is also to be understood that the terminology used in the description is for the purpose of describing the particular versions or embodiments only, and is not intended to limit the scope of the present application. This summary is not intended to identify essential features of the claimed subject matter nor is it intended for use in determining or limiting the scope of the claimed subject matter.

[006] In one implementation, a system to continuously sense and measure a temperature of a liquid steel is disclosed. The system may comprise a lens mounted in a pipe. The lens may be placed such that infrared radiation (IR) from the liquid steel is at an incident angle to the lens. Further, a fibre optic cable may be connected to the lens at a first end, while the second end may be connected to a processor at a second end. The processor may be configured to convert IR into an analog temperature signal. The processor may further be coupled to a filter coupled. Wherein the filter may be configured to filter out slag temperature from the analog temperature signal. The system may further comprise a display coupled to the filter, wherein the display is configured to render temperature of the liquid steel.

[007] In another implementation, a method for continuous sensing and measuring temperature of a liquid steel is disclosed. The method comprises the step of homogenizing the temperature of the liquid steel using argon gas purging. Further capturing an infrared radiation (IR) from the liquid steel. The method further comprises converting the captured Infrared radiation to an analog temperature signal. The analog temperature signal may further be mapped to a predefined temperature, wherein the predefined temperature can be in the range of 1550-16500C. Further, the temperature of the liquid steel may be displayed on a digital indicator.
BRIEF DESCRIPTION OF DRAWINGS
[008] The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the drawings to refer like features and components.
[009] Figure 1, illustrates a system, in accordance with an embodiment of the present subject matter.
[0010] Figure 2 illustrates an infrared radiation sensing device deployed within a processor of Figure 1
[0011] Figure 3 illustrates a conventional schematic of a step-index optical fibre of Figure 1.

DETAILED DESCRIPTION

[0012] Some embodiments of the present disclosure, illustrating all its features, will now be discussed in detail. The words “generating”, “extracting”, “computing” “determining”, and other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items, or meant to be limited to only the listed item or items. It must also be noted that as used herein and in the appended claims, the singular forms "a", "an" and "the" include plural references unless the context clearly dictates otherwise. Although any systems and methods similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, the exemplary, systems and methods for determining a defectiveness score of a current code are now described. The disclosed embodiments of the system and method for determining a defectiveness score of a current code are merely exemplary of the disclosure, which may be embodied in various forms.
[0013] Various modifications to the embodiment will be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments. However, one of ordinary skill in the art will readily recognize that the present disclosure for determining a defectiveness score of a current code is not intended to be limited to the embodiments illustrated, but is to be accorded the widest scope consistent with the principles and features described herein.
[0014] The present subject matter relates to sensing and measuring temperature of liquid steel during homogenisation by rinsing. The system and method as disclosed comprises purging of liquid steel with an inert gas like Argon (Ar). The purging or rinsing causes turbulence in the liquid steel and helping in separation of the slag formed on the liquid steel, thus exposing the actual liquid steel. The system as disclosed then senses the Infrared radiation of the liquid steel and measures the radiation spectrum to create a temperature profile of the same. The Infrared radiation is sensed using a hollow pipe configured to receive Infrared radiation from the liquid steel during or post purging. The hollow pipe can further be configured to release inert gas like Nitrogen to keep the hollow pipe clean and receive the infrared radiation without any obstacle. Further, the infrared radiation is incident on a lens. The lens may be protected by a glass protector against the high temperature and harsh working conditions.
[0015] Further the infrared radiation captured or detected by the lens are transmitted to a processor via optic fibre. The processor converts the infrared radiation into analog signals. The analog signals then filtered by a filter to segregate slag temperature and the liquid steel temperature. The filter may be communicably coupled with the processor. Further the filtered signal may be rendered or displayed on a display.
[0016] Referring to Figure 1 illustrates a system in accordance with the present disclosure. The system (100) as disclosed may comprise a container (104), wherein the container may comprise liquid steel. The liquid steel may be purged or rinsed with inert gas like Argon (Ar). The inert gas may be provided by a supply pipe (112). Further the system (100) may comprise a pipe (108), wherein the pipe (108) may be hollow internally. Further the pipe (108) may be configured to transfer infrared radiation (106), captured or received from the liquid steel, to a lens (114) placed at distal end of the pipe (108). The lens (114) may be protected by a glass protector. The infrared radiation (106) received by the lens (114) may further transmitted to a processor (118) via an optic fibre (116). The optic fibre (116) is connected with the lens (114) at first end and with the processor (118) at the second end. The processor (118) may be configured to convert the infrared radiation signal into an analog signal. The analog signal may further be transmitted to a filter (120). The filter may be communicably connected with the processor (118). The filter (120) may be configured to segregate the temperature of the slag from that of the liquid steel. Further the system may comprise a display (122) wherein a temperature profile may be rendered real time and continuously for the liquid steel during the purging and homogenization.
[0017] In another exemplary embodiment of the present disclosure the system (100) as disclosed senses and measures the temperature of the liquid steel, and further render or display a real-time and continuous temperature profile of the liquid steel. For homogenization of the liquid steel, the liquid steel is purged using inert gas, like Argon (Ar), wherein the inert gas may be supplied or provided by the supply pipe (112). The liquid steel held in a container (104) may be exposed to the inert gas to create turbulence in the liquid steel. As an effect of the turbulence a slag deposited on the liquid steel may separate thus exposing the real liquid steel. Further, the infrared radiation (IR) (106) emitting from the liquid steel may be transmitted from the source, i.e. the liquid steel, to a lens (114). The transmission of the IR (106) may be done through the pipe (108). Further, the pipe (108) may be cleaned to remove any dirt being deposited in the pipe (108), by purging the pipe (108) with inert gas like Nitrogen (N), wherein Nitrogen can be supplied via a second pipe (110).
[0018] In one embodiment, the lens (114) may be positioned or mounted at the distal end of the pipe (108). The lens (114) may be protected by the glass protector. The IR (106) captured by the lens are further transmitted to the processor (118). The transmission may be done through the optic fibre (116), wherein a first end of the optic fibre (116) is connected to the lens and the second end is connected to the processor (118). The processor (118), may be configured to convert the IR (106) received into analog signal temperature signals. Further, the filter (120) maps the analog temperature signals from the processor (118) with a pre-defined temperature value. The pre-defined temperature values can be in the range of 1550 degree Celsius to 1650 degree Celsius. The mapping of the analog temperature further enables the separation or segregation of the slag temperature and the liquid steel temperature. Further analog temperature may be rendered or displayed as continuous real time temperature profile of the liquid steel on a display (122) communicably connected to the filter. In an exemplary embodiment, the processor is established a manner that temperatures which are more than 1550 degree Celsius and less than 1650 degree Celsius are counted and averaged into a single reading to represent the bath temperature.
[0019] In one embodiment, the temperature of the liquid steel is compared with a dip temperature, wherein the dip temperature is measured using thermocouple at end of argon gas purging.
[0020] Referring to Figure 2 illustrates an infrared radiation sensing device, in accordance with an embodiment of the present subject matter. A device (200) for sensing and measuring the temperature of the liquid steel during homogenization by purging is disclosed. In an exemplary embodiment the probe (200) as illustrated may be positioned between the pipe (108) and the processor (118) thereby enabling the swapping of the lens, and the optic fibre with the probe (200). The device (200) may comprise a light pipe or lens (202). The infrared radiation emitted from the heat source like liquid steel may be captured the light pipe or lens (202). The infrared radiation captured by the light pipe or lens (202) may transmitted to a filter (204). The filter (204) may segregate the infrared radiations from other spectral waves. The device (200) may further comprise a photodetector (206) connected to the filter (204). The photodetector (206) may be enabled to capture or detect a specific infrared radiation spectrum that corresponds to 1550 degree Celsius to 1650 Degree Celsius in terms of temperature range. Further, the detected radiation may be amplified using an amplifier (208). The amplified radiation or signal may be further transmitted to an analog to digital convertor (210), and further to another processor (212). In one embodiment, the infrared radiation which is emitted from the object surface is collected by the quartz fiber.
[0021] Referring to Figure 3 a schematic of a step-index optical fibre is illustrated. It is noted that an optical fiber consists of a thin, low-loss glass wire with a center or core region having a slightly higher refractive index than its surrounding region or cladding. In one aspect, the light received is guided inside the core region by total internal reflection at the core-cladding interface. Depending on the size of the core region, one single or multiple light paths (modes) are permitted to propagate, referred to as single-mode or multimode fiber. Typically, the bare optical fiber has an outer diameter of 125µm with a core diameter of 9µm in the case of single-mode fibers and 50µm or 62.5µm for multimode fibers. Different protective coatings are applied to protect the fibre from possible mechanical damage. The theory of the fiber optic based temperature measuring devices lies with the spectral radiation energy of a blackbody as by Planck’s law.

Where C1 and C2 are Planck’s radiation constants, ? is the wavelength in micrometer, and T the absolute temperature of the body in Kelvin.
[0022] Exemplary embodiments discussed above may provide certain advantages. Though not required to practice aspects of the disclosure, these advantages may include those provided by the following features.
[0023] Although embodiments of method of preparing wet and fired iron ore pellets are explained, it is to be understood that the appended claims are not necessarily limited to the specific process described. Further, the specific process are disclosed as examples of embodiments of process method of preparing wet and fired iron ore pellets.
[0024] Some of the object of the invention is to provide real-time measurement of liquid steel temperature during the Argon gas rinsing of liquid steel.
[0025] Some of the object of the invention is to homogenize temperature of the liquid steel during argon gas purging time variation from 3 - 7 minutes.