Gas extraction pipe self-degreasing double-loop deflagration flame arrestor

Abstract

The application discloses a gas extraction pipe self-degreasing double-circuit deflagration flame arrestor, which comprises a double-circuit self-degreasing device and a combustion explosion flame arrestor connected to a gas pipeline, wherein the double-circuit self-degreasing device comprises two branch circuits connected in parallel, and each branch circuit is provided with a filter, a pressure detection mechanism and a circuit electromagnetic valve, which are used for controlling the closing of the branch circuit under the condition that the pressure difference of the branch circuit reaches a pressure difference critical value, and controlling the opening of the branch circuit under the condition that the pressure difference of the other branch circuit reaches the pressure difference critical value. The combustion explosion flame arrestor comprises a gas pipeline and a transverse flame arrestor and explosion relief membrane net, a temperature sensor and an electromagnetic valve device arranged in the gas pipeline, which are used for controlling the closing of the gas pipeline under the condition that the temperature of the gas in the pipeline reaches a temperature critical value. The application adopts the pressure detection mechanism and the circuit electromagnetic valve, realizes the double-circuit self-switching in the process of filtering mixed impurities, and can significantly reduce the labor cost.

Description

Technical Field

[0001] This invention relates to the field of coal mine gas extraction engineering technology, and in particular to a gas extraction pipe self-slag removal dual-circuit deflagration arrestor device. Background Technology

[0002] Currently, most coal mines require gas drainage. Gas, being a flammable and explosive gas, is highly susceptible to temperature rise during transport within drainage pipelines due to environmental and pipeline system factors, potentially igniting the gas and causing explosions. This is especially true for low-concentration gas pipelines, where gas concentrations are typically between 10% and 20%, while explosive concentrations range from 5% to 16%. Currently, low-concentration gas pipelines are generally equipped with two-stage (explosion arrestor, powder injection for explosion suppression) or three-stage (explosion arrestor, powder injection for explosion suppression, and backfire prevention) flame arrestors and explosion venting devices. While these achieve the goal of flame arrest and explosion venting, multiple sets of equipment are required to prevent combustion and explosion. This is not only costly and involves a large amount of engineering work, but also relies on passive flame arrest and explosion venting—meaning that the explosion is only detected after combustion and explosion has already occurred within the pipeline, resulting in weak disaster prevention capabilities. In addition, during the extraction of gas from underground coal mines, the gas contains coal slag and water. Currently, the main method used is to install local water discharge and slag removal devices to periodically discharge water and slag, and all of these are single-channel installations. If water and slag are not discharged in time, it will cause the entire extraction pipeline network to be blocked, affecting extraction efficiency and increasing the risk of accidents. Summary of the Invention

[0003] In view of the problems existing in the prior art, the present invention provides a dual-circuit deflagration and flame arrestor device for gas extraction pipes with self-removing slag, so as to solve a series of problems such as the large number of flame arrestor and explosion relief devices for low-concentration gas transportation pipelines, high cost, large amount of engineering work, lagging disaster prevention capabilities, low efficiency of pipeline water discharge and slag removal, and the risk of pipe blockage increasing the accident hazard.

[0004] This invention discloses a dual-loop deflagration and flame arrestor for a gas extraction pipe with self-cleaning slag removal, comprising: a dual-loop self-cleaning slag remover and a deflagration and flame arrestor sequentially connected to the gas pipeline according to the gas flow direction, wherein the dual-loop self-cleaning slag remover includes two branch loops arranged in parallel, and each branch loop is equipped with:

[0005] A filter is used to remove mixed impurities from the gas entering the gas pipeline;

[0006] Pressure detection mechanism, used to obtain the pressure difference before and after the filter in the branch circuit;

[0007] A solenoid valve is used to control the closure of a branch circuit when the differential pressure in the branch circuit reaches a critical value, and to control the opening of a branch circuit when the differential pressure in another branch circuit reaches a critical value.

[0008] The aforementioned flame arrester includes a gas pipeline, the front and rear ends of which are respectively connected to the gas outlet of the dual-circuit autonomous slag remover and the gas pipeline; it also includes a component installed in the gas pipeline:

[0009] Horizontal flame arrestor and explosion relief membrane mesh is used to dissipate heat and cool down the gas passing through it.

[0010] Temperature sensor, used to detect the temperature of gas inside a gas pipeline;

[0011] A solenoid valve is used to control the shut-off of a gas pipeline when the gas temperature inside the pipeline reaches a critical temperature value.

[0012] Furthermore, the device also includes several pipeline flanges, with the dual-loop autonomous ash remover and the flame arrester connected to the gas pipeline through corresponding pipeline flanges, and the dual-loop autonomous ash remover and the flame arrester are also connected through corresponding pipeline flanges.

[0013] Furthermore, the nominal diameter D of the pipeline flange shall not be greater than the nominal diameter d of the gas pipeline; the distance between the installation location of the flame arrester and the potential explosion source shall not be greater than 50 times the nominal diameter D of the pipeline flange.

[0014] Furthermore, the filter includes an explosion-proof sealing shell, inside which is a slag remover main pipe for connecting to the branch circuit; the bottom of the slag remover main pipe is connected to a vertically arranged slag discharge funnel, and a slag discharge port is provided at the connection between the two, so that the slag remover main pipe and the slag discharge funnel are connected; the bottom of the slag discharge funnel is provided with a slag discharge port, and a slag discharge valve is provided at the slag discharge port.

[0015] Furthermore, the slag discharge funnel is spindle-shaped or olive-shaped.

[0016] Furthermore, the pressure detection mechanism includes: an inlet pressure gauge and an outlet pressure gauge disposed in the branch circuit and located before and after the filter, respectively.

[0017] On the branch circuit, the circuit solenoid valve is located in front of the pressure gauge at the inlet end.

[0018] Furthermore, the expression for obtaining the pressure difference before and after the filter on the branch loop is as follows:

[0019] P = P1 - P2

[0020] Where P is the pressure difference before and after the filter in the branch circuit, P1 is the pressure value detected by the pressure gauge at the inlet end, and P2 is the pressure value detected by the pressure gauge at the outlet end.

[0021] Furthermore, the solenoid valve device includes:

[0022] The solenoid valve stroke mechanism installed in the gas pipeline is used to block the propagation path of flammable and explosive gases when closed.

[0023] A solenoid valve trigger, connected to the solenoid valve stroke mechanism, is used to control its closure;

[0024] The signal transmission cable connects the temperature sensor to the solenoid valve trigger, which provides feedback to the solenoid valve trigger when the gas temperature inside the pipe reaches the critical temperature value.

[0025] Furthermore, the horizontal flame arrestor and explosion venting membrane mesh is a copper horizontal flame arrestor and explosion venting membrane mesh, and its gap degree Y ranges from 0.4mm to 1.0mm.

[0026] The present invention has at least the following beneficial effects:

[0027] When using this invention for gas extraction, coal slag and wastewater in the gas are filtered through a filter via one branch of the dual-loop autonomous slag remover to prevent clogging. This invention employs a pressure detection mechanism and a loop solenoid valve to switch to the other branch loop when coal slag and wastewater accumulate to a certain level in the filter, achieving autonomous switching between the two loops and significantly reducing labor costs.

[0028] When the temperature of the gas rises or gas combustion or explosion occurs in the gas extraction pipeline, the flame arrester monitors and identifies the situation through a temperature sensor, and closes the gas passage inside the flame arrester through a solenoid valve device, thereby blocking the continued propagation of the flammable gas and greatly improving the safety and reliability of the gas extraction pipeline system.

[0029] Other beneficial effects of the present invention will be described in detail in the Detailed Description of the Embodiments section. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of a dual-circuit deflagration arrestor device for a gas extraction pipe with self-removing slag removal, provided in an embodiment of the present invention.

[0032] Figure 2 This is a schematic diagram of the filter structure in a dual-loop deflagration arrestor device for a gas extraction pipe with self-removing slag removal, provided as an embodiment of the present invention.

[0033] Figure 3 This is a schematic longitudinal section of the structure of the flame arrestor in a gas extraction pipe self-slag removal dual-loop deflagration flame arrestor provided in an embodiment of the present invention.

[0034] Figure 4 This is a cross-sectional view of the structure of the flame arrestor in a gas extraction pipe self-slag removal dual-loop deflagration flame arrestor provided in an embodiment of the present invention.

[0035] in, Figure 1 and Figure 3 The arrow "→" in the diagram indicates the direction of gas flow. See the table below for the attached diagram labels.

[0036] 1 Gas pipeline 101 Pipe flange 2 Dual-loop autonomous slag remover 3 Explosion flame arrester 211 First solenoid valve 212 First intake pressure gauge 213 First filter 214 First outlet pressure gauge 221 Second solenoid valve 222 Second intake pressure gauge 223 Second filter 224 Second outlet pressure gauge 200 Explosion-proof sealed housing 201 Slag remover main pipe 202 Slag discharge port 203 Slag funnel 204 Slag discharge valve 205 Slag discharge port 301 Temperature sensor 302 Signal transmission cable 303 Solenoid valve trigger 304 Solenoid valve stroke mechanism 305 Horizontal flame arrestor and explosion relief membrane mesh Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0038] like Figures 1 to 4 As shown, this invention discloses a dual-loop self-cleaning deflagration and flame arrestor for gas extraction pipes, mainly comprising a dual-loop self-cleaning ash remover 2 and a deflagration and flame arrestor 3 inserted into the gas pipeline 1. The inlet of the dual-loop self-cleaning ash remover 2 is connected to the upstream gas pipeline 1 via a pipeline flange 101, and the outlet of the dual-loop self-cleaning ash remover 2 is connected to the inlet of the deflagration and flame arrestor 3 via a pipeline flange 101. The outlet of the deflagration and flame arrestor 3 is connected to the downstream gas pipeline 1. To better achieve explosion-proof and flame-retardant protection for the gas pipeline, the dual-loop self-cleaning ash remover 2 should be installed on the inlet side of the deflagration and flame arrestor 3.

[0039] The dual-loop autonomous ash remover 2 mainly consists of two parallel branch loops. During use, one branch loop is in operation while the other is on standby. Each branch loop of the dual-loop autonomous ash remover 2 is equipped with a loop solenoid valve, an inlet pressure gauge, a filter, and an outlet pressure gauge in sequence from air inlet to air outlet.

[0040] The key component of the dual-loop autonomous slag remover 2 is the filter. The filter components include an explosion-proof sealing shell 200, a main slag remover pipe 201, a slag discharge port 202, a slag discharge funnel 203, a slag discharge valve 204, and a slag discharge outlet 205. The main slag remover pipe 201 is vertically connected to the slag discharge funnel 203, with the connection point being the slag discharge port 202. The slag discharge funnel 203 should be installed vertically. The slag discharge funnel 203 has a spindle-shaped or olive-shaped structure, thicker in the middle and thinner at both ends, designed to provide sufficient storage space for coal slag and water while facilitating rapid discharge of these substances.

[0041] The components of the flame arrester 3 include a temperature sensor 301, a signal transmission cable 302, a solenoid valve trigger 303, a solenoid valve stroke mechanism 304, and a horizontal flame arrestor and explosion relief membrane 305.

[0042] This embodiment provides a dual-circuit deflagration and flame arrestor device for gas extraction pipelines with self-removing slag. The device is installed in the gas extraction pipeline to extract gas, and its working principle includes the following:

[0043] The gas pipeline features automatic slag removal and loop switching. Gas containing coal slag and wastewater first passes through a dual-loop automatic slag remover 2. One branch loop (the first branch loop) of the dual-loop automatic slag remover 2 is operational, while the other branch loop (the second branch loop) is on standby. When the first branch loop is continuously operating, the coal slag and wastewater in the main pipe 201 of the slag remover enter the slag discharge funnel 203 through the slag discharge port 202 for filtration. When the coal slag and wastewater accumulate to a certain amount in the slag discharge funnel 203, the resistance of the gas loop increases, resulting in a greater pressure difference between the inlet and outlet of the first branch loop. When the pressure difference reaches the set critical pressure difference value P0, the first solenoid valve 211 of that branch loop closes, simultaneously triggering the opening of the second solenoid valve 221 of the second branch loop, which is in standby mode, thus completing the automatic switching from the working loop to the standby loop. After switching, the slag discharge valve 204 of the first filter 213 is opened to discharge the coal slag and wastewater deposited in the slag discharge funnel 203 through the slag discharge port 205, and the gas is filtered through the second filter 223 on the second branch circuit. Similarly, the second branch circuit of the dual-circuit autonomous slag remover 2 can also be automatically switched to the first branch circuit.

[0044] The pressure detection mechanism in the dual-loop autonomous slag remover 2 includes: an inlet pressure gauge (first inlet pressure gauge 212, second inlet pressure gauge 222) and an outlet pressure gauge (first outlet pressure gauge 214, second outlet pressure gauge 224). The pressure difference P between the two reaches the critical pressure difference value P0, which is the trigger condition for the control loop solenoid valves (first solenoid valve 211, second solenoid valve 221) to close. The critical pressure difference value P0 is specifically set after calculation based on the nominal diameter d of the gas pipeline and the gas concentration and flow rate in the pipeline. Existing methods will not be described in detail here.

[0045] In the deflagration arrestor of the gas pipeline, when the gas containing coal slag and sewage is filtered by the dual-loop self-cleaning slag remover 2, the gas discharged from the dual-loop self-cleaning slag remover 2 is mainly gas. After the gas enters the deflagration arrestor 3, it is cooled by the horizontal flame arrestor and explosion relief membrane 305 and then discharged from the deflagration arrestor 3. When the temperature of the gas rises or a gas combustion or explosion occurs in the gas extraction pipeline on one side of the inlet end of the flame arrester 3, the gas temperature in the pipeline rises. The high-temperature gas enters the flame arrester 3 after being filtered by the dual-loop self-cleaning ash remover 2. When the temperature sensor 301 in the flame arrester 3 detects that the temperature of the high-temperature gas has reached the set critical value T0, it immediately sends a closing signal to the solenoid valve trigger 303 in the flame arrester 3 via the signal transmission cable 302. The solenoid valve trigger 303 controls the solenoid valve stroke mechanism 304 to close the gas passage in the flame arrester 3, that is, to close the gas pipeline of the flame arrester 3, block the gas pipeline, and achieve the purpose of blocking the path of the flammable gas to the outlet end of the flame arrester 3.

[0046] The dual-loop autonomous slag remover 2 adopts a dual-loop structure for automatic slag removal and drainage. Compared with the existing gas extraction pipeline slag remover, it has the advantages of simple structure, convenient installation and maintenance, high efficiency in slag removal and drainage, high level of automation and safety and reliability, and can save a lot of financial, material and human resources.

[0047] In this embodiment, the horizontal flame arrestor and explosion venting membrane 305 in the flame arrestor 3 is made of copper. The gap Y of the horizontal flame arrestor and explosion venting membrane 305 is determined according to the fracture condition of the coal and rock strata from which the gas originates, and generally ranges from 0.4mm to 1.0mm. The horizontal flame arrestor and explosion venting membrane 305 is installed horizontally to achieve rapid heat dissipation and cooling while facilitating the passage of gas and reducing resistance in the gas delivery pipeline. All these features combined effectively ensure that the horizontal flame arrestor and explosion venting membrane 305 has the advantages of rapid heat dissipation and cooling, facilitating gas flow, and significantly reducing resistance in the gas delivery pipeline.

[0048] The nominal diameter D of the pipeline connecting the dual-circuit autonomous slag remover 2, the flame arrester 3, and the gas pipeline 1 is related to the nominal diameter d of the gas pipeline 1: D ≤ d. The distance L between the installation position of the flame arrester 3 and the potential explosion source is related to the diameter D of the pipeline where the flame arrester 3 is installed: L ≤ 50D.

[0049] The device disclosed in this embodiment uses a dual-loop autonomous slag remover 2 and a flame arrester 3, both of which are operated automatically. This greatly reduces the amount of manual maintenance, decreases the probability of human error, improves the slag removal efficiency of the gas extraction pipeline, and further improves the gas extraction efficiency.

[0050] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A dual-circuit deflagration arrestor for a gas extraction pipe with self-cleaning slag removal, characterized in that, include: A dual-loop self-cleaning ash remover and a flame arrester are sequentially connected to the gas pipeline according to the gas flow direction. The dual-loop self-cleaning ash remover includes two branch loops connected in parallel, and each branch loop is equipped with: A filter is used to remove mixed impurities from the gas entering the gas pipeline; Pressure detection mechanism, used to obtain the pressure difference before and after the filter in the branch circuit; A loop solenoid valve is used to control the closure of a branch loop when the differential pressure in the branch loop reaches a critical value, and to control the opening of a branch loop when the differential pressure in another branch loop reaches a critical value. The aforementioned flame arrester includes a gas pipeline, the two ends of which are connected to the outlet of the dual-circuit autonomous slag remover and the gas pipeline, respectively; it also includes a component installed in the gas pipeline: Horizontal flame arrestor and explosion relief membrane mesh is used to dissipate heat and cool down the gas passing through it. Temperature sensor, used to detect the temperature of gas inside a gas pipeline; A solenoid valve is used to control the shut-off of a gas pipeline when the gas temperature inside the pipeline reaches a critical temperature value.

2. The gas extraction pipe self-slag removal dual-circuit deflagration arrestor device according to claim 1, characterized in that, The device also includes several pipeline flanges. The dual-loop autonomous ash remover and the flame arrester are connected to the gas pipeline through the corresponding pipeline flanges, and the dual-loop autonomous ash remover and the flame arrester are also connected through the corresponding pipeline flanges.

3. The gas extraction pipe self-slag removal dual-circuit deflagration arrestor device according to claim 2, characterized in that, The nominal diameter D of the pipeline flange shall not be greater than the nominal diameter d of the gas pipeline; the distance between the installation location of the flame arrester and the potential explosion source shall not be greater than 50 times the nominal diameter D of the pipeline flange.

4. The gas extraction pipe self-slag removal dual-circuit deflagration arrestor device according to claim 1, characterized in that, The filter includes an explosion-proof sealing shell, inside which is a slag remover main pipe for connecting to the branch circuit; the bottom of the slag remover main pipe is connected to a vertically arranged slag discharge funnel, and a slag discharge port is provided at the connection between the two, so that the slag remover main pipe and the slag discharge funnel are connected; the bottom of the slag discharge funnel is provided with a slag discharge port, and a slag discharge valve is provided at the slag discharge port.

5. The gas extraction pipe self-slag removal dual-circuit deflagration arrestor device according to claim 4, characterized in that, The slag discharge funnel is spindle-shaped or olive-shaped.

6. The gas extraction pipe self-slag removal dual-circuit deflagration arrestor device according to claim 1, characterized in that, The pressure detection mechanism includes: an inlet pressure gauge and an outlet pressure gauge, which are respectively located in front of and behind the filter in the branch circuit. On the branch circuit, the circuit solenoid valve is located in front of the pressure gauge at the inlet end.

7. The gas extraction pipe self-slag removal dual-circuit deflagration arrestor device according to claim 6, characterized in that, The expression for obtaining the pressure difference before and after the filter on the branch loop is as follows: P = P1 - P2; Where P is the pressure difference before and after the filter in the branch circuit, P1 is the pressure value detected by the pressure gauge at the inlet end, and P2 is the pressure value detected by the pressure gauge at the outlet end.

8. The gas extraction pipe self-slag removal dual-circuit deflagration arrestor device according to claim 1, characterized in that, The solenoid valve device includes: The solenoid valve stroke mechanism installed in the gas pipeline is used to block the propagation path of flammable and explosive gases when closed. A solenoid valve trigger, connected to the solenoid valve stroke mechanism, is used to control its closure; The signal transmission cable connects the temperature sensor to the solenoid valve trigger, which provides feedback to the solenoid valve trigger when the gas temperature inside the pipe reaches the critical temperature value.

9. The gas extraction pipe self-slag removal dual-circuit deflagration arrestor device according to claim 1, characterized in that, The aforementioned horizontal flame arrestor and explosion venting membrane is a copper horizontal flame arrestor and explosion venting membrane, and its gap degree Y ranges from 0.4mm to 1.0mm.

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