Inerting protection device of coal mine gas oxidation utilization system

Abstract

The invention provides an inerting protection device of a coal mine gas oxidation utilization system, and belongs to the field of coal mine gas utilization safety protection. An inerting protection device of a coal mine gas oxidation utilization system is composed of an inerting gas storage tank, a gas pipeline, an inerting gas nozzle device, an electromagnetic valve and an alarm. The high-pressure inert gas stored in the gas storage tank is quickly injected into the gas pipeline from the inert gas nozzle device through the gas pipeline, so that the concentration of the gas entering the gas oxidation device is quickly reduced, and the gas oxidation device is filled with the inert gas in the shortest time; the explosion-proof inerting function of the gas oxidation device is realized, and the safety risk of the gas oxidation device caused by factors such as overhigh concentration, temperature or pressure can be effectively prevented.

Description

Technical Field

[0001] The invention relates to the technical field of safety protection for coal mine gas oxidation utilization, and in particular to an inerting protection device for a coal mine gas oxidation utilization system. Background Art

[0002] Coal mine gas refers to the mixed gas mainly composed of methane that escapes from coal seams during underground coal mining. According to statistics, the amount of coal mine gas in my country is about 50-60 billion m3. 3 / year. For high-concentration gas, the general method of utilizing it is to build a gas power station. However, for low-concentration gas, it is not suitable for direct power generation. The current mainstream treatment method is to oxidize and decompose the low-concentration gas by flameless oxidation and other methods. For example, the patent "An oxidation bed for a countercurrent catalytic oxidation device for exhaust gas" (application number CN 106268312A) provides a low-concentration exhaust gas oxidation treatment method.

[0003] However, gas itself is a flammable and explosive gas, and it also releases a lot of heat when it is used in flameless oxidation treatment. This leads to the possibility that the gas evolution and utilization system may be dangerous when working due to factors such as internal temperature, pressure, and gas concentration exceeding the safety threshold, which may cause equipment damage or even explosion.

[0004] To this end, the present application designs an inerting protection device for a coal mine gas oxidation utilization system to solve the above-mentioned problems. Summary of the invention

[0005] In order to make up for the deficiencies in the prior art, the present invention provides an inerting protection device for a coal mine gas oxidation and utilization system. By monitoring the sensor arranged inside the gas oxidation and utilization system, the inerting protection device is activated when a possible safety risk is detected, thereby quickly realizing the inerting protection of the gas oxidation and utilization system and effectively avoiding the occurrence of safety risks.

[0006] An inerting protection device for a coal mine gas oxidation and utilization system, comprising a coal mine gas pretreatment system and a coal mine gas oxidation device, characterized in that: A gas pipeline is connected between the coal mine gas pretreatment system and the coal mine gas oxidation device. An inerting gas nozzle device is arranged on the gas pipeline. The inerting gas nozzle device is connected to an inerting gas storage tank arranged on the ground through a pipeline.

[0007] Furthermore, in order to better realize the present invention, the inerting protection device of the coal mine gas oxidation utilization system is provided with redundant protection measures, that is, two sets of inerting gas storage tanks are provided, each set of inerting gas storage tanks is connected to the gas distribution row through the gas main line, and the gas distribution row is connected to the inerting gas nozzle device through the secondary pipeline; the main gas line is provided with a main solenoid valve and an alarm instrument, and the secondary pipeline is provided with a secondary solenoid valve.

[0008] Furthermore, in order to better realize the present invention, the inerting gas nozzle device is arranged on the gas pipeline near the gas oxidation device, and a plurality of inerting gas nozzles are arranged in a ring at equal intervals on the inerting gas nozzle device, and the number of nozzles is an even number greater than or equal to 6; each inerting gas nozzle is connected to a secondary pipeline, and any two adjacent inerting gas nozzles are ultimately connected to different gas storage tanks.

[0009] Furthermore, in order to better realize the present invention, each of the inerting gas nozzles forms an angle α with the gas flow direction of the gas pipeline, and α is 25°~65°; the size and number of the inerting gas nozzles arranged on the inerting gas nozzle device are determined according to the diameter and flow rate of the gas pipeline.

[0010] Furthermore, in order to better realize the present invention, each of the inerting gas nozzles forms an angle α with the gas flow direction of the gas pipeline, and α is 25°~65°; the size and number of the inerting gas nozzles arranged on the inerting gas nozzle device are determined according to the diameter and flow rate of the gas pipeline.

[0011] Furthermore, in order to better realize the present invention, the main solenoid valve is arranged at the inert gas outlet position close to the gas storage tank, and the secondary solenoid valve is arranged at the inert gas nozzle position; the main solenoid valve and the secondary solenoid valve are both normally open solenoid valves, that is, when the solenoid valve is powered off, the solenoid valve automatically enters the open state.

[0012] Furthermore, in order to better realize the present invention, when any of the temperature, pressure or gas concentration sensors in the coal mine gas oxidation device exceeds the set safety threshold, an opening instruction is immediately sent to the inerting gas protection device to control all solenoid valves to enter the open state, and the high-pressure inert gas stored in the gas tank enters the gas pipeline along the gas pipeline to realize the inerting protection of the gas oxidation device.

[0013] The beneficial effects of the present invention are: The inerting protection device of the present invention can rapidly release high-pressure inert gas when it detects that the temperature, pressure, gas concentration, etc. inside the gas oxidation device exceed the set safety threshold, so that the gas oxidation device rapidly enters the inerting protection state, thereby effectively realizing the protection of the oxidation device and reducing the risk of safety accidents occurring in the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the inerting protection device of the coal mine gas oxidation utilization system of the present invention; Figure 2 It is a cross-sectional schematic diagram of an inerting gas nozzle device of an inerting protection device of a coal mine gas oxidation utilization system of the present invention; Figure 3 The present invention is a schematic diagram of the inerting gas nozzle device of the inerting protection device of the coal mine gas oxidation utilization system and the gas flow direction and angle.

[0015] In the figure, 1. Coal mine gas pretreatment system, 2. Gas pipeline, 3. Coal mine gas oxidation device, 4. Inerting gas storage tank, 5. Main solenoid valve, 6. Alarm, 7. Gas main line, 8. Gas distribution exhaust, 9. Secondary pipeline, 10. Inerting gas nozzle device, 11. Inerting gas nozzle, 12. Secondary solenoid valve, 401, charging port, 402, valve, 403, barometer. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0018] Figure 1-Figure 3 This is a specific embodiment of the present invention, which is an inerting protection device for a coal mine gas oxidation utilization system, consisting of an inerting gas storage tank 4, a gas main line 7, a secondary pipeline 9, an inerting gas nozzle device 10, a main solenoid valve 5, a secondary solenoid valve 12, and an alarm 6.

[0019] The inerting protection device itself has redundant protection measures, that is, the inerting gas storage tank 4, the gas main line 7 and the secondary pipeline 9, the main solenoid valve 5 and the secondary solenoid valve 12, and the alarm 6 all have two sets of equipment, which are rotated at the position of the inerting gas nozzle device 10 and connected to the gas pipeline 2 together, which can not only reduce the inerting protection time of the gas oxidation utilization system, but also avoid as much as possible the situation where the protection device cannot work due to damage to some equipment.

[0020] When any of the temperature, pressure or gas concentration sensors set in the coal mine gas oxidation device 3 exceeds the set safety threshold, an opening instruction is immediately sent to the inerting gas protection device to control the solenoid valve to enter the open state, and the high-pressure inert gas stored in the gas storage tank 4 will enter the gas pipeline along the gas pipeline to achieve inerting protection of the gas oxidation device.

[0021] The solenoid valve comprises a two-stage valve, a main solenoid valve 5 and a secondary solenoid valve 12 . The main solenoid valve 5 is arranged at the inert gas outlet position close to the gas storage tank, and the secondary solenoid valve 12 is arranged at the inert gas nozzle 11 position.

[0022] The gas pipeline includes a two-level structure of a main pipeline 7 and a secondary pipeline 9 , and the main pipeline 7 and the secondary pipeline 9 are connected by a gas distribution row 8 .

[0023] The inerting gas nozzle device 10 is arranged on the gas pipeline 2 near the gas oxidation device 3. A plurality of inerting gas nozzles 11 are arranged in an annular manner at equal intervals on the inerting gas nozzle device 10, and the number of nozzles is an even number greater than or equal to 6. Each inerting gas nozzle 11 forms an angle α with the gas flow direction of the gas pipeline 2, and α is 25° to 65°. The size and number of the inerting gas nozzles 11 arranged on the inerting gas nozzle device 10 are determined according to the pipe diameter and flow rate of the gas pipeline.

[0024] The inerting gas nozzles 11 are connected to the two gas storage tanks 4 respectively through the secondary pipeline 9 , the gas distribution row 8 , and the main pipeline 7 in sequence, and any two adjacent inerting gas nozzles 11 are finally connected to different gas storage tanks 4 .

[0025] The gas storage tank 4 further comprises a charging port 401 , a valve 402 , and a barometer 403 , which are used to replenish the high-pressure inert gas in the gas storage tank 4 .

[0026] The main solenoid valve 5 and the secondary solenoid valve 12 are both normally open solenoid valves, that is, when the solenoid valve is powered off, the solenoid valve automatically enters the open state. An alarm 6 is provided between the main solenoid valve 5 and the main pipeline 7. When the sensor in the alarm 6 detects that there is gas flowing in the pipeline, it will sound a buzzer and turn on a warning light to give an alarm.

[0027] like Figure 2 The present invention is a cross-sectional schematic diagram of an inerting gas nozzle device of an inerting protection device of a coal mine gas oxidation utilization system. It can be seen from the figure that the inerting gas nozzles provided on the inerting gas nozzle device are arranged in an equidistant ring, and any two adjacent inerting gas nozzles are ultimately connected to two different inerting gas storage tanks.

[0028] like Figure 3The present invention is a schematic diagram of an inerting gas nozzle device of an inerting protection device of a coal mine gas oxidation utilization system, a gas flow direction and an angle. As can be seen from the figure, the inerting gas nozzle is connected to the gas pipeline at an angle α along the upstream direction of the gas flow direction, and the angle α is 25°~65°.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. An inerting protection device for a coal mine gas oxidation utilization system, comprising a coal mine gas pretreatment system (1) and a coal mine gas oxidation device (3), characterized in that: A gas pipeline (2) is connected between the coal mine gas pretreatment system (1) and the coal mine gas oxidation device (3). An inert gas nozzle device (10) is provided on the gas pipeline (2). The inert gas nozzle device (10) is connected to an inert gas storage tank (4) arranged on the ground through a pipeline.

2. The inerting protection device of the coal mine gas oxidation and utilization system according to claim 1 is characterized in that: The inerting protection device of the coal mine gas oxidation utilization system is provided with redundant protection measures, namely, two sets of inerting gas storage tanks (4) are provided, each set of inerting gas storage tanks (4) is connected to a gas distribution exhaust (8) via a gas main pipeline (7), and the gas distribution exhaust (8) is connected to an inerting gas nozzle device (10) via a secondary pipeline (9); a main solenoid valve (5) and an alarm (6) are provided on the gas main pipeline (7), and a secondary solenoid valve (12) is provided on the secondary pipeline (9).

3. The inerting protection device of the coal mine gas oxidation and utilization system according to claim 1 is characterized in that: The inerting gas nozzle device (10) is arranged on the gas pipeline (2) near the gas oxidation device (3), and a plurality of inerting gas nozzles (11) are arranged in a ring at equal intervals on the inerting gas nozzle device (10), and the number of nozzles is an even number greater than or equal to 6; each inerting gas nozzle (11) is connected to a secondary pipeline (9), and any two adjacent inerting gas nozzles (11) are ultimately connected to different gas storage tanks (4).

4. The inerting protection device of the coal mine gas oxidation and utilization system according to claim 3 is characterized in that: Each of the inerting gas nozzles (11) forms an angle α with the gas flow direction of the gas pipeline (2), and α is 25° to 65°. The size and number of the inerting gas nozzles (11) arranged on the inerting gas nozzle device (10) are determined according to the diameter and flow rate of the gas pipeline.

5. The inerting protection device of the coal mine gas oxidation and utilization system according to claim 3 is characterized in that: The gas storage tank (4) further comprises a gas charging port (401), a valve (402), and a barometer (403) for replenishing high-pressure inert gas in the gas storage tank (4).

6. The inerting protection device of the coal mine gas oxidation and utilization system according to claim 2, characterized in that: The main solenoid valve (5) is arranged at a position close to the inert gas outlet of the gas storage tank (4), and the secondary solenoid valve (12) is arranged at a position of the inert gas nozzle (11); the main solenoid valve (5) and the secondary solenoid valve (12) are both normally open solenoid valves, that is, when the solenoid valve is powered off, the solenoid valve automatically enters an open state.

7. The inerting protection device of the coal mine gas oxidation and utilization system according to claim 1 is characterized in that: When any of the temperature, pressure or gas concentration sensors in the coal mine gas oxidation device (3) exceeds a set safety threshold, an opening instruction is immediately sent to the inerting gas protection device to control all solenoid valves to enter an open state, and the high-pressure inert gas stored in the gas storage tank (4) enters the gas pipeline (2) along the gas pipeline, thereby realizing inerting protection of the gas oxidation device.

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