Claims:We claim

1. N2 PURGING SYSTEM FOR FINE COAL BIN AERATION comprising with plurality number of seamless cylinder, N2 cylinder valve and duly filled with N2 gas, load cell mechanism, seamless pipe, cylinder manifold, Solenoid valves, pneumatically operated high-pressure valve, limit switch, Pressure reducing valve, Position control unit with Analogue signal output, Isolation valves, discharge nozzle
Wherein the number of the cylinder will be finalized based on user gas requirement and duration of the operation;
Wherein the Cylinders located on the platform with load cell mechanism for monitoring the gas weight;
Wherein cylinder manifold fabricated with the seamless pipe;
Wherein all N2 cylinders connected to the main header with high-pressure hose connection;
Wherein Solenoid valves provided between the hose connection and cylinder manifold to control the operation/selection of the cylinder from the user panel.
Wherein pneumatically operated high-pressure valve is provided at outlet of each cylinder manifold with a solenoid actuator;
Wherein the limit switch is provided after the outlet of selector valve Isolation valve with open/close indication;
wherein Pressure reducing valve with solenoid actuator provided on main and standby line joint with a common outlet,
wherein Position control unit with Analogue signal output for User use/controls (optional);
wherein after the Isolation valves (Manual and solenoid valve) Pressure gauge and Pressure transmitter with Analogue signal output provided;
Wherein after pressure reducing section pneumatically operated flow control valve with solenoid actuator provided. Along with this flow control valve, Each branch is provided with a solenoid valve and manual isolation valve for control flow to each area;
Wherein at the end of the gas flow line, N2 gas Discharge Nozzle is provided

2. N2 PURGING SYSTEM FOR FINE COAL BIN AERATION as claimed in claim 1 wherein if the system for multiple uses then a directional valve manifold and number of braches propose according to the number for the area protected.

3. N2 PURGING SYSTEM FOR FINE COAL BIN AERATION as claimed in claim 1 wherein required number of N2 gas-filled seamless cylinder (Item No-1) mount on the cylinder mounting platform, this platform resting on load cell unit ( Item no.11), wherein the load cell unit has connected with a digital weight monitoring unit for continued monitoring of the cylinder with gas weight and the total weight during the commissioning of the system total cylinder bank weight will set with monitoring unit and alarm set point also user can finalize the alarm set point, hence during gas discharger user panel can get the audio/visual signal as N2 gas cylinder weight loss/empty.

4 N2 PURGING SYSTEM FOR FINE COAL BIN AERATION as claimed in claim 1 wherein Each cylinder fitted with N2 cylinder valve, cylinder valve outlet connected with a high-pressure discharge hose ( item-2), and other end connected with solenoid valve ( Item 3) fixed on the cylinder manifold, normally required cylinder are kept in open condition however N2 gas will available inlet of the solenoid valve.

5 N2 PURGING SYSTEM FOR FINE COAL BIN AERATION as claimed in claim 1 wherein the solenoid on manifold (item-3) operation controls by the user, they have the option to operate single or multiple cylinders from Main or Standby bank.

6 N2 PURGING SYSTEM FOR FINE COAL BIN AERATION as claimed in claim 1 wherein the outlet of each cylinder manifold is fixed with a Pneumatic operated directional valve with a solenoid actuator (item-4), this valve is operated by the user according to the selection of Main/Standby wherein after the solenoid valve manual operated valve with open/close position indicator (Item 6) provided with Main/Standby line for the isolated line during the maintenance.

7 N2 PURGING SYSTEM FOR FINE COAL BIN AERATION as claimed in claim 1 wherein main & standby lines join together and lead to a single supply line for gas flow to the Fine coal Bin/protected area wherein in this line, a pneumatically operated Pressure reducing valve with position indicator (Item-5) with analogue output signal provided for reducing the initial gas pressure to 2.5 bar and the multi number of pressure-reducing valves also will provide if pressure is not reached in the designed out-put pressure.

8 N2 PURGING SYSTEM FOR FINE COAL BIN AERATION as claimed in claim 1 wherein after the pressure reducing valve, a solenoid valve (Item-3-a) is provided to control ON/OFF the gas flow from the Users panel and Manual operated isolation valve (Item-6-a) with ON/OFF position indicator is also provided for the Isolate line manually, pressure transmitter with analogue output (Item-8) provided in the same line, so user can find the actual pressure available in the line.

9 N2 PURGING SYSTEM FOR FINE COAL BIN AERATION as claimed in claim 1 wherein a pressure gauge (Item 7) was proposed for local verification of the pressure, pressure reduced N2 gas entering to Flow control valve (Item-9) with position control with analogue output, User can control the valve opening position based on flow available at the pipeline and flow monitor with the analogue output signal (Item- 10) also provided for monitoring the flow rate at the entry point, so the user can do the needful control from the user panel.

10. N2 PURGING SYSTEM FOR FINE COAL BIN AERATION as claimed in claim 1 wherein self-resetting type nozzle is provided for discharge the gas to the Coal Bin/protected area which nozzle normally in close condition and during the gas discharge nozzle opens with the pressure of N2 gas.

11. N2 PURGING SYSTEM FOR FINE COAL BIN AERATION as claimed in claim 1 wherein operation log of the present invented system is utilizing 120 to 150 bar high-pressure Nitrogen gas storage gas injecting to Fine Coal Bin hopper area through discharge nozzle at the pressure 2.5 to 1.5 bar with a required flow rate of 3.5 M3 to 20 M3 per hour.

12. N2 PURGING SYSTEM FOR FINE COAL BIN AERATION as claimed in claim 1 wherein Facilities are provided for controlling the operation of pressure, flow rate, isolation, etc. by user DSC panel wherein each cylinder is provided with manually operated valves but gas flow controls by the solenoid provided with the main header, solenoid provided for each cylinder outlet however the user can select the number of cylinder operations from the control room.

13. N2 PURGING SYSTEM FOR FINE COAL BIN AERATION as claimed in claim 1 wherein the outlet of each cylinder manifold is provided with an electro/pneumatic selector valve so, gas flow can control by the user from the control panel as main or standby , wherein main and Stand by header joined with a common outlet line where pressure reducing valve provided control the pressure as user requirement. (Maximum 150 to minimum 1.5 bar pressure.) and in a pressure transmitter and valve position monitor with analogue 4 -20 mA output signal to the user panel, so the user can monitor the valve position and pressure in the pipeline , the number of pressure reducing valves considered based on the inlet pressure and outlet pressure.

14. N2 PURGING SYSTEM FOR FINE COAL BIN AERATION as claimed in claim 1 wherein one Isolation valve provided the outlet line of each selector valve so the user can isolate the line for doing the maintenance of further outlet portion of the pipeline.

15. N2 PURGING SYSTEM FOR FINE COAL BIN AERATION as claimed in claim 1 after the pressure reducing section Flow monitor valve with position indicator and flow monitor provided, therefore the user can monitor the flow rate and valve operation from the user control DCS panel, these units also give the 4-20 ma signal for the user DCS panel and in between the gas flow line manual isolation valves and solenoid valves are provided for isolate flow lines by the user whenever they need for maintenance.

16. N2 PURGING SYSTEM FOR FINE COAL BIN AERATION as claimed in claim 1 wherein outlet pipeline directly fixed with to fine coal bin hopper portion, the same line can be provided with multiple coal bin hopper with electric/pneumatic directional valves, this can make the economic system with a centralized cylinder bank.

17. N2 PURGING SYSTEM FOR FINE COAL BIN AERATION as claimed in claim 1 wherein at the end line proposed self-resetting type gas discharge nozzle to avoid the dust entering to nozzle orifice and cylinder bank provided with load cell mechanism for monitoring the cylinder with gas weight, so during the discharge of gas, user can get the information how much weight becomes less in the cylinder bank so user can replace empty cylinder immediately for further use
Dated this __________________
For ,
VIMAL FIRE CONTROLS PVT LTD

___________________
To, Name
The Controller of Patent Designation
The Patent Office, At MUMBAI
, Description:FORM 2
THE PATENT ACT 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)

1. TITLE OF THE INVENTION
N2 PURGING SYSTEM FOR FINE COAL BIN AERATION
2. APPLICANT (S)
APPLICANT (S)
NAME NATIONALITY COUNTRY OF
RESIDENCE ADDRESS
VIMAL FIRE CONTROLS PVT LTD INDIAN INDIA A – 1, 851 / 1 , G.I.D.C, Makarpura, Vadodara – 390 01, GUJARAT, INDIA.

PREMABLE TO THE DESCRIPTION
The following specification particularly describes the nature of the invention and the manner in which it is to be performed.

N2 PURGING SYSTEM FOR FINE COAL BIN AERATION
Field of the Invention
The present invention relates to an N 2 purging system for fine coal bin aeration. Nitrogen gas Purging system for fine Bin aeration using inject the low-pressure Nitrogen gas into the Coal Bin Hopper for not allow accommodate dust particles in the hopper portion for avoiding the wrong reading of different monitoring equipment installed within the Coal Bin. Once the contents of the Coal Bin are combined with nitrogen, dilution occurs. This combination is then vented, and the process is repeated.
This method is ideal when a Coal Bin only operation. The amount of nitrogen required in this case will depend on the number of pressurized purges required to reduce the contaminant until it reaches an acceptable level. The present invention is mainly used for FINE COAL BIN aeration purposes at Cement plants and this system can use other areas also where low-pressure nitrogen continue or with intervals injection is required for the part of system requirement.

Background of the Invention
The coal grinding process is a process in which coal is broken and its surface area is continuously increased. Coal is ground into pulverized coal in a coal mill, mainly by crushing, crushing and grinding. In order to improve the combustion efficiency of pulverized coal, it is always desirable to mill the pulverized coal finer. The more the surface area of the pulverized coal is in contact with the air, the more the oxidation reaction with oxygen in the air is intensified, which will cause the container to accumulate. The pulverized coal temperature rises, and the spontaneous combustion of pulverized coal is more likely to occur and cause an explosion. The coal mill is prone to spontaneous combustion explosion during the working process, mainly due to the oxidation reaction of pulverized coal and oxygen in the air to produce CO. The concentration of CO gas increases in the limited space inside the coal mill, which reduces the ignition point of the combustible mixture in the coal mill. The risk of fire or explosion of the coal mill is increased. In addition, the internal temperature and pressure of the coal mill are sharply increased, which will accelerate the spontaneous combustion explosion.
The CO content in the coal mill is the main factor causing the spontaneous combustion explosion of the coal mill. When the CO content is detected, the probe with the filtering device is generally used, but the probe is easy to wear for a long time and the coal powder is easy to accumulate at the gas inlet of the probe. The sampling is inaccurate, the sampling speed is slow, the large granular coal powder is filtered through the filtering device, and then pre-treatment such as cooling, dust removal, water removal, etc., finally, the CO gas is analyzed, and the analysis methods mainly include electrochemical analysis method and infrared method. However, although the electrochemical analysis method has a fast response, it has a cumulative drift and is in direct contact with the CO gas. In contrast, the infrared detection method has a slower detection speed, a higher cost, is very sensitive to vibration, and has poor maintainability. Direct contact with gas, the advantage of non-cumulative drift. Once the CO content in the coal mill is detected to exceed the standard, the prior art often adopts the method of direct shutdown to prevent the spontaneous combustion explosion of the coal mill. In some literatures, the method of eliminating the spontaneous combustion by introducing an inert gas into the coal mill is described in the literature. Improve the anti-explosion performance, but the introduction of inert gas will increase the internal pressure of the coal mill. In the prior art, the influence of the CO content in the coal mill on the explosion of the coal mill is considered, and the temperature and pressure are rarely considered. The impact of changes on the internal working conditions of the coal mill, but the increase in pressure and temperature can lead to the danger of spontaneous combustion of the coal mill. At present, most domestic power plants mainly judge whether the coal mill is in flame or in a dangerous state of explosion by monitoring the temperature of the coal outlet medium. The main disadvantages of this method are: on the one hand, it is impossible to identify the explosion in time. And processing, because the coal mill outlet temperature is regulated by the hot air and cold air door of the coal mill. When the coal mill outlet temperature is high, usually the operating personnel will close the small hot damper and open the large air damper for adjustment. When the outlet temperature of the machine still cannot return to the normal value, the coal mill has caught fire. It is inevitable that the explosion will occur at this time; on the other hand, the outlet temperature of the coal mill cannot completely reflect whether the coal mill is in a dangerous state or not. It is only one of the factors that affect the sister's explosion. When the concentration of flammable gas is high, even at a lower temperature, an explosion will occur.
Chinese invention patent, publication number: 102270374A, publication date: December 7, 2011, disclosed a CO gas detection and alarm device, belonging to the field of harmful gas detection technology, which includes CO gas detection alarm signal processing main control circuit, electricity Chemical sensor, CO gas detection PPM value LCD display and CO gas detection sound and light alarm. The utility model is characterized in that a relay K coil and a contact switch controlled by the CPU program controlled by the CO gas detection alarm signal processing main control system single-chip output signal are added to protect the electrochemical sensor. In addition, the RS485 signal and the 4-20 mACO gas concentration PPM value analog signal are simultaneously sent, so that the alarm signal is connected to other systems through the network, so that the gas leakage accident may be solved in time. The shortcoming is that the patent is for the detection of harmful gases, and there are still many problems in the application of the coal mill, such as the problem of delay in the detection of CO content transmission.
Chinese invention patent, publication number: 104771852A publication date: 15th of 2015, disclosed a pulverized coal tank inert gas protection device and its use method, which comprises a CO2 output line and an N2 output line; The first total control valve, the first decompression table, the first vaporizer, the first inserting controller and the first throttle valve are connected in series, one end of the CO2 output pipeline is connected to the CO2 storage device, and the other end is connected to more than one CO2 branch pipe a road, each CO2 branch line is connected to an upper part of the powder tank; the N2 output line is connected in series to the second main control valve, the second decompression table, the second vaporizer, the second inerting controller and the second throttle valve. One end of the N2 output pipeline is connected to the N2 storage device, and the other end is connected to more than one N2 branch pipeline, and each N2 branch pipeline is connected to the lower part of the powder tank; each powder tank is provided with monitoring devices, and each monitoring device is respectively connected The control system, the control system is respectively connected to the first main control valve and the second main control valve. The invention can effectively prevent the spontaneous combustion of the coal powder, and can also make the inert gas gently pass into the pulverized coal tank, thereby ensuring that the pulverized coal particles reach a stable state gently. The disadvantage is that the patent is used for anti-spontaneous combustion explosion of pulverized coal tank, and the pulverized coal tank is used for storing the pulverized coal pulverized coal, the internal working condition is relatively simple, and the volume is small; The pulverized coal tanks are all equipped with valves and inert gases (carbon dioxide and nitrogen). The gas and temperature conditions inside the pulverized coal tanks are monitored in real time through the control system. The control and maintenance costs are high, which is not suitable for promotion on coal mills; thermocouples Located outside the pulverized coal tank, it can not truly reflect the changing state of the internal temperature of the pulverized coal tank. The error is large and the actual protection is not achieved. Secondly, although the inert gas can reduce the possibility of spontaneous combustion explosion, the inert gas The addition will increase the internal pressure of the pulverized coal tank, which will bring a burden to the pulverized coal tank. It will easily exceed the original pressure limit of the pulverized coal tank to increase the possibility of explosion.

In the Fixed type of Nitrogen generating plants /PSA unit is installed in the premises for use the low-pressure Nitrogen fine bin coal aeration system, this will high expensive and regular maintenance also required. For providing a Nitrogen generating plant/PSA unit, large space and high cost infrastructural is required. Nitrogen generation plant always located away from Coal Bin and multi Coal Bin also provided in the plant. Fixed type Nitrogen gas supply pipes line have to lay down from Nitrogen plant /PSA unit to Coal Bins. During the shutdown of the Nitrogen generating plant /PSA unit, users do not have any option for operating the system other than providing a reserve Nitrogen generating /PSA unit at the site.
To overcome the limitation of the existing problems in the present invention system is use.

Object of the invention
The main object of the present invention system is available with Industrial Nitrogen filled cylinders, and any number cylinder quantity can provide within the system, hence this very much economically cheaper the fixed type Nitrogen generator/PSA unit.

Another object of the present invention system wherein N2 AERATION SYSTEM is movable and user can fix the system anywhere near to Coal Bin hence nitrogen gas pipeline cost can save much higher than fixed type PSA system

Further object of the present invention N2 AERATION SYSTEM used the number of industrial seamless cylinders and each cylinder provided with electric/manual operated control valves, User can control /select the operation of cylinder hence system can operate continually without any disturbance and full system shut down is not applicable.

N2 AERATION SYSTEM individual cylinder can send for refilling without disturbing the system operation. Even a high-pressure storage cylinder however minimum quantity storage cylinder can store more gas quantity.

In short the present invention system can accommodate within the small area near to operation place, Moreover the system is economically cheaper than any other such system. The system does not need to shut down for replacement of storage cylinder. In the present invention system is fully automatically operated for user DCS panel. In the present invention system provided with all operation feedback to user panel however pressure and gas flow can control by the user as the requirement.

Statement of the Invention
For a better -understanding of the invention, its operating advantages and the specific objects attained by its uses, reference should be the accompanying drawings and descriptive matter in which there is illustrated the preferred embodiments of the invention.

The present invention system provides the following standard indigenously and locally available equipment.
(i) Seamless cylinder as per IS 7285 with N2 cylinder valve and duly filled with N2 gas at the pressure of 120 to 150 Bar. The number of the cylinder will be finalized based on user gas requirement and duration of the operation.
(ii) Standby (reserve) cylinder banks also can provide as per the User specification.
(iii) Cylinders located on the platform with load cell mechanism for monitoring the gas weight
(iv) Main header ( Cylinder manifold) fabricated with the seamless pipe as per ASTM A 106 schedule 160,
(v) All N2 cylinders connected to the Main header with high-pressure hose connection,
(vi) In-between the hose connection and Main header (Cylinder manifold) we have provided Solenoid valves to control the operation/selection of the cylinder from the user panel.
(vii) The outlet of each Cylinder Manifold provided with a pneumatically operated high-pressure valve with a solenoid actuator. Operation voltage shall be as available at the site. ( Selector valve- one each for Main and Standby line)
(viii) After the outlet of selector valve Isolation valve with open/close indication with limit switch facility provided. ( One each for main & Standby line)
(ix) Main and Standby line joint with a common outlet, on this outlet pneumatically operated Pressure reducing valve with solenoid actuator provided. Along with this pressure reducing valve, in the present invented system proposed a Position control unit with Analogue signal output for User use/controls. ( Number of pressure reducing valve propose in the gas flow line based on the system design)
(x) After pressure reducing valve, we proposed a Manual and Solenoid isolation valve.
(xi) After the Isolation valves (Manual and solenoid valve) Pressure gauge and Pressure transmitter with Analogue signal output provided.
(xii) After pressure reducing section pneumatically operated Flow control valve with solenoid actuator provided. Along with this flow control valve, the present system proposed a Position control unit and Flow with Analogue signal output for User use/controls.
(xiii) If using the system for multiple uses then the present system proposed a directional valve manifold and number of braches propose according to the number for the area protected.
(xiv) Each branch is provided with a solenoid valve and manual isolation valve for control flow to each area.
(xv) At the end of the gas flow line, we proposed specially designed self-resetting type nozzles for discharge the N2 gas into the Fine Coal Bin/ protected area.
(xvi) The number of nozzles proposed is based on the design.

BRIEF DESCRIPTION OF THE DRAWINGS
The structure and the technical means adopted by the present invention is to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings.
Fig.1 represents the schematic diagram for nitrogen purging system for single coal bin
Fig.2 represents the schematic diagram for nitrogen purging system for multiple coal bin
Detailed description of the invention
Before explaining the present invention in detail, it is to be understood that the invention is not limited in its application to the details of the construction and arrangement of parts illustrated in the accompanying drawings. The invention is capable of other embodiments, as depicted in different figures as described above and of being practiced or carried out in a variety of ways. It is to be understood that the phraseology and terminology employed herein is for the purpose of description and not of limitation.

As shown in Fig. 1 Required number of N2 gas-filled seamless cylinder (Item No-1) mount on the specially designed cylinder mounting platform, this platform resting on load cell unit ( Item no.11). Minimum 4 nos load cell unit proposed for each cylinder mounting platform. This load cell unit has connected with a digital weight monitoring unit for continued monitoring of the cylinder with gas weight. Total weight during the commissioning of the system total cylinder bank weight will set with monitoring unit and alarm set point also user can finalize the alarm set point, hence during gas discharger user panel can get the audio/visual signal as N2 gas cylinder weight loss/empty. After receiving the signal user can replace the N2 cylinder or the user can send the cylinders for re-filling.

Each cylinder fitted with N2 cylinder valve, cylinder valve outlet connected with a high-pressure discharge hose ( item-2), and other end connected with solenoid valve ( Item 3) fixed on the cylinder manifold, normally required cylinder are kept in open condition however N2 gas will available inlet of the solenoid valve.
The solenoid on manifold (item-3) operation controls by the user, they have the option to operate single or multiple cylinders from Main or Standby bank.

The outlet of each cylinder manifold is fixed with a Pneumatic operated directional valve with a solenoid actuator (item-4), this valve is operated by the user according to the selection of Main/Standby. After the solenoid valve manual operated valve with open/close position indicator (Item 6) provided with Main/Standby line for the isolated line during the maintenance.

Main & Standby lines join together and lead to a single supply line for gas flow to the Fine coal Bin/protected area. In this line, a pneumatically operated Pressure reducing valve with position indicator (Item-5) with analogue output signal provided for reducing the initial gas pressure to 2.5 bar. Multi number of pressure-reducing valves also will provide if pressure is not reached in the designed out-put pressure. Users can control the valve opening position according to the pressure in the line. Valve opening potion also can monitor by the users based on the analogue output signal of the position indicator provided with the valve.(Optional)

After the pressure reducing valve, a solenoid valve (Item-3-a) is provided to control ON/OFF the gas flow from the Users panel, Manual operated isolation valve (Item-6-a) with ON/OFF position indicator is also provided for the Isolate line manually.

Pressure transmitter with analogue output (Item-8) provided in the same line, so User can find the actual pressure available in the line. A pressure gauge (Item 7) was proposed for local verification of the pressure.
Pressure reduced N2 gas entering to Flow control valve (Item-9) with position control with analogue output, (Optional) User can control the valve opening position based on flow available at the pipeline. Flow monitor with the analogue output signal (Item- 10) also provided for monitoring the flow rate at the entry point, so the user can do the needful control from the user panel.

End of the pipeline in the present invention system have provided a specially designed self-resetting type nozzle for discharge the gas to the Coal Bin/protected area. This nozzle normally in close condition and during the gas discharge nozzle opens with the pressure of N2 gas.

Brief operation log of the present invented system is utilizing 120 to 150 bar high-pressure Nitrogen gas storage gas injecting to Fine Coal Bin hopper area through discharge nozzle at the pressure 2.5 to 1.5 bar with a required flow rate of 3.5 M3 to 20 M3 per hour. Also in the present invented system have provide the facility to control the pressure and flow rating according customer specification.

N2 cylinder system for fine Coal bin conical portion aeration, the system consisting from the storage N2 cylinder to Gas discharge nozzle to Fine coal Bin. 100% standby cylinders are also included in present system design. Cylinder capacity will finalize based on storage capacity and flow rate required by the user.

Seamless cylinders duly approved by PESO duly filled with Normal Industrial Nitrogen gas at the pressure of 120 to 150 bar pressure injecting to Fine coal Bin at the rate of 1.5 to 3.5 bar pressure and with a discharge rate of 3.5 to 20 M3 per hour. (as per the user requirement).

Facilities are provided for controlling the operation of pressure, flow rate, isolation, etc. by user DSC panel. Each cylinder is provided with manually operated valves but gas flow controls by the solenoid provided with the main header, solenoid provided for each cylinder outlet however the user can select the number of cylinder operations from the control room.

Independent Manifold used for main and Standby cylinder bank. The outlet of each cylinder manifold is provided with an electro/pneumatic selector valve so, gas flow can control by the user from the control panel as main or standby.

One Isolation valve provided the outlet line of each selector valve so the user can isolate the line for doing the maintenance of further outlet portion of the pipeline.

Main and Stand by header joined with a common outlet line where pressure reducing valve provided control the pressure as user requirement. (Maximum 150 to minimum 1.5 bar pressure.) Also, in the present invention system proposed a pressure transmitter and valve position monitor with analogue 4 -20 mA output signal to the user panel, so the user can monitor the valve position and pressure in the pipeline. The number of pressure reducing valves considered based on the inlet pressure and outlet pressure.

After the pressure reducing section Flow monitor valve with position indicator and flow monitor provided, therefore the user can monitor the flow rate and valve operation from the user control DCS panel, these units also give the 4-20 ma signal for the user DCS panel. In-between the gas flow line manual isolation valves and solenoid valves are provided for isolate flow lines by the user whenever they need for maintenance.

Outlet pipeline directly fixed with to Fine coal bin hopper portion, the same line can be provided with multiple coal bin hopper as shown in Fig,2 with electric/pneumatic directional valves, this can make the economic system with a centralized cylinder bank. Such case flow monitor and pressure monitor provide for each flow section.

At the end line, we proposed a specially designed self-resetting type gas discharge nozzle to avoid the dust entering to nozzle orifice.

Cylinder bank provided with load cell mechanism for monitoring the cylinder with gas weight, so during the discharge of gas, user can get the information how much weight becomes less in the cylinder bank so user can replace empty cylinder immediately for further use.

The complete system shall be operated from the user DCS panel. Entire N2 system shall be automatically controlled by the user from the DCS panel. The operating voltage shall be considered based on availability with the user. (If user need separate panel, we can incorporate the same as optional)

While, the invention has been described with respect to the given embodiment, it will be appreciated that many variations, modifications and other applications of the invention may be made. However, it is to be expressly understood that such modifications and adaptations are within the scope of the present invention, as set forth in the following claims.