Automatic air distribution system for coal mine gas

Abstract

The utility model belongs to the technical field of coal mine gas distribution, in particular to an automatic coal mine gas distribution system, which comprises a gas mixer, a centrifugal fan and a heat storage oxidation device, and two connecting pipes are fixedly communicated with the inlet end of the gas mixer. According to the automatic air distribution system for the coal mine gas, the gas mixer, the centrifugal fan, the heat storage oxidation device, the connecting pipe, the pipeline I, the pipeline II, the primary air distribution assembly, the secondary air distribution assembly, the gas infrared analyzer I, the pneumatic stop valve and the flow meter are arranged; the gas mixed by the gas mixer is mixed by the primary air distribution assembly, the gas mixed by the primary air distribution assembly is mixed again by the secondary air distribution assembly in the continuous conveying process, and finally the concentration of the gas can be controlled within 1.25%. Therefore, the operation safety of the rear-end heat storage oxidation device is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mine gas air distribution, and specifically relates to an automatic coal mine gas air distribution system. Background Technique

[0002] At present, low-concentration gas with a concentration of less than 30% in the extracted coal mine gas generally cannot be directly utilized. In order to save energy, the low-concentration gas can be incorporated into a mixing device, and the gas concentration can be reduced by incorporating air, and then it is transported into a regenerative oxidation device to generate utilizable energy through exothermic oxidation. When reducing the concentration of coal mine gas, a mixing and air distribution system is correspondingly required. However, in the current automatic mixing and air distribution system for coal mine gas, there are defects in the adjustment accuracy and timing accuracy of the control method for the mixing ratio of low-concentration gas and air, which is not conducive to the safe and normal operation of the regenerative oxidation device. Therefore, we propose an automatic coal mine gas air distribution system to solve the above problems. Content of the Utility Model

[0003] (1) Technical Problems to be Solved

[0004] Aiming at the deficiencies of the prior art, the utility model provides an automatic coal mine gas air distribution system, which solves the problems put forward in the above background technique.

[0005] (2) Technical Solutions

[0006] The utility model specifically adopts the following technical solutions to achieve the above purposes:

[0007] An automatic coal mine gas air distribution system includes a gas mixer, a centrifugal fan, and a regenerative oxidation device. The inlet end of the gas mixer is fixedly connected with two connecting pipes. The outlet end of the gas mixer is fixedly connected with the inlet end of the centrifugal fan through a pipeline 1. The outlet end of the centrifugal fan is fixedly connected with the inlet end of the regenerative oxidation device through a pipeline 2. A primary air distribution component and a secondary air distribution component are installed on the pipeline 1. A gas infrared analyzer 1 for sampling and detecting the mixing concentration of the gas mixer is installed on the pipeline 1.

[0008] Further, the primary air distribution component includes an air inlet pipe 1 fixedly connected to the pipeline 1. A pneumatic control valve 1 is installed on the air inlet pipe 1. A gas laser concentration detection sensor 1 and a gas infrared analyzer 2 are installed on the pipeline 1.

[0009] Further, the secondary air distribution component includes an air inlet pipe 2 fixedly connected to the pipeline 1. A pneumatic control valve 2 is installed on the air inlet pipe 2. A gas laser concentration detection sensor 2 and a gas infrared analyzer 3 are installed on the pipeline 1.

[0010] Furthermore, a pneumatic cut-off valve for controlling and cutting off the conveyed gas is installed on the first pipeline.

[0011] Furthermore, a flowmeter for measuring the gas flow inside the pipeline is installed on the second pipeline.

[0012] Furthermore, flange plates are installed at one ends of the two connecting pipes.

[0013] (III) Beneficial effects

[0014] Compared with the prior art, the present utility model provides a coal mine gas automatic air distribution system, which has the following beneficial effects:

[0015] In the present utility model, by setting up a gas mixing device, a centrifugal fan, a regenerative oxidation device, a connecting pipe, a first pipeline, a second pipeline, a primary air distribution assembly, a secondary air distribution assembly, a first gas infrared analyzer, a pneumatic cut-off valve and a flowmeter, during the process of using this coal mine gas automatic air distribution system, with the cooperation of the primary air distribution assembly, the gas after being mixed by the gas mixing device will be further mixed by the primary air distribution assembly. During the continuous conveying process of the gas after being mixed by the primary air distribution assembly, it will be further mixed by the secondary air distribution assembly again. Finally, the gas concentration can be controlled within 1.25%, thus ensuring the safety of the operation of the subsequent regenerative oxidation device. Description of the drawings

[0016] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0017] Figure 2 is a schematic diagram of the structure of the primary air distribution assembly of the present utility model;

[0018] Figure 3 is a schematic diagram of the structure of the secondary air distribution assembly of the present utility model;

[0019] Figure 4 is a schematic diagram of the structure of the regenerative oxidation device of the present utility model.

[0020] In the figure: 1, gas mixing device; 2, centrifugal fan; 3, regenerative oxidation device; 4, connecting pipe; 5, first pipeline; 6, second pipeline; 7, primary air distribution assembly; 701, first air inlet pipe; 702, first pneumatic regulating valve; 703, first gas laser concentration detection sensor; 704, second gas infrared analyzer; 8, secondary air distribution assembly; 801, second air inlet pipe; 802, second pneumatic regulating valve; 803, second gas laser concentration detection sensor; 804, third gas infrared analyzer; 9, first infrared analyzer; 10, pneumatic cut-off valve; 11, flowmeter; 12, flange plate. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] Embodiment

[0023] As Figure 1 、 Figure 2 、 Figure 3 and Figure 4 shown, an automatic coal mine gas air distribution system proposed in an embodiment of the present utility model includes a gas mixer 1, a centrifugal fan 2, and a regenerative oxidation device 3. Two connecting pipes 4 are fixedly connected to the inlet end of the gas mixer 1. Flange plates 12 are installed at one ends of the two connecting pipes 4, which facilitates the connection and fixation of the two connecting pipes 4 to the pipeline for transporting gas. The outlet end of the gas mixer 1 is fixedly connected to the inlet end of the centrifugal fan 2 through a pipeline 1 5. The outlet end of the centrifugal fan 2 is fixedly connected to the inlet end of the regenerative oxidation device 3 through a pipeline 2 6. A primary air distribution component 7 and a secondary air distribution component 8 are installed on the pipeline 1 5. A gas infrared analyzer 1 9 for sampling and detecting the mixing concentration of the gas mixer 1 is installed on the pipeline 1 5. When using this automatic coal mine gas air distribution system, this gas extraction mixer 1 is a Venturi mixer, which can accelerate the incoming gas to 45 m / s through a unique design, generate negative pressure siphon in the internal orifice plate to suck the gas on the other side inlet, and enable the gas transported by the two connecting pipes 4 to be fully mixed. During the flow of the gas mixed by the gas mixer 1 in the pipeline 1 5, the gas infrared analyzer 1 9 can monitor the concentration of the mixed gas in real time. Then the gas will continue to be transported to the primary air distribution component 7 for mixing, and at this time, the gas concentration after primary air distribution can be controlled within 1.5%. Then the gas after primary mixing will continue to move to the secondary air distribution component 8 for further mixing, and at this time, the gas concentration after secondary air distribution will be controlled within 1.25%. Finally, under the action of the centrifugal fan 2, the qualified mixed gas can be sent into the regenerative oxidation device 3 for use. Among them, the infrared analyzer 1 9 is composed of a sample gas sampling pipeline, a sampling pump, a sample gas condensation dryer, a methane infrared analysis device, and a compressed gas purging system, and this system can accurately detect the concentration of the gas.

[0024] As Figure 1 and Figure 2As shown, in some embodiments, the primary air distribution component 7 includes an air inlet pipe 701 connected and fixed to the first pipe 5. A pneumatic control valve 702 is installed on the air inlet pipe 701. A gas laser concentration detector 703 and a second gas infrared analyzer 704 are installed on the first pipe 5. During use, with the cooperation of the centrifugal fan 2, when the gas after being mixed by the gas mixer 1 flows, it will be mixed with the air entering from the air inlet pipe 701. The gas laser concentration detector 703 and the second gas infrared analyzer 704 can detect and monitor the gas after the primary mixing in real time. The pneumatic control valve 702 can accurately control the air intake volume of the air inlet pipe 701, so as to control the gas concentration after the primary air distribution within 1.5%.

[0025] As Figure 1 and Figure 3 As shown, in some embodiments, the secondary air distribution component 8 includes an air inlet pipe 801 connected and fixed to the first pipe 5. A pneumatic control valve 802 is installed on the air inlet pipe 801. A second gas laser concentration detector 803 and a third gas infrared analyzer 804 are installed on the first pipe 5. During use, with the cooperation of the centrifugal fan 2, when the gas after being mixed by the primary air distribution component 7 continues to flow, it will be mixed with the air entering from the air inlet pipe 801. The second gas laser concentration detector 803 and the third gas infrared analyzer 804 can detect and monitor the gas after the secondary mixing in real time. And the pneumatic control valve 802 can accurately control the air intake volume inside the air inlet pipe 801, so as to control the gas concentration after the secondary air distribution within 1.25%.

[0026] As Figure 3 As shown, in some embodiments, a pneumatic cut-off valve 10 for controlling and cutting off the conveyed gas is installed on the first pipe 5. When the gas concentration exceeds the limit or the system gives a corresponding instruction, the pneumatic cut-off valve 10 can cut off the gas supply at this time.

[0027] As Figure 1 and Figure 4 As shown, in some embodiments, a flow meter 11 for measuring the gas flow inside the pipe is installed on the second pipe 6. The flow meter 11 can detect the gas flow entering the regenerative oxidation device 3, so that the staff can know its flow value.

[0028] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A coal mine gas automatic air distribution system, comprising a gas blender (1), a centrifugal fan (2) and a thermal storage oxidation device (3), characterized in that: The inlet end of the gas mixer (1) is connected and fixed with two connecting pipes (4); the outlet end of the gas mixer (1) is connected and fixed with the inlet end of the centrifugal fan (2) through a pipe 1 (5); the outlet end of the centrifugal fan (2) is connected and fixed with the inlet end of the thermal storage oxidation device (3) through a pipe 2 (6); a primary air distribution component (7) and a secondary air distribution component (8) are installed on the pipe 1 (5); and a gas infrared analyzer 1 (9) for sampling and detecting the mixing concentration of the gas mixer (1) is installed on the pipe 1 (5).

2. The automatic coal mine gas air distribution system according to claim 1, characterized in that: The primary air distribution assembly (7) comprises an air inlet pipe (701) connected and fixed to a pipe (5), a pneumatic regulating valve (702) being installed on the air inlet pipe (701), and a gas laser concentration detection sensor (703) and a gas infrared analyzer (704) being installed on the pipe (5).

3. The automatic coal mine gas air distribution system according to claim 1, characterized in that: The secondary air distribution assembly (8) comprises an air inlet pipe 2 (801) connected and fixed on the pipeline 1 (5), a pneumatic regulating valve 2 (802) is installed on the air inlet pipe 2 (801), and a gas laser concentration detection sensor 2 (803) and a gas infrared analyzer 3 (804) are installed on the pipeline 1 (5).

4. The automatic air distribution system for coal mine gas according to claim 1, characterized in that: The pipeline 1 (5) is provided with a pneumatic shut-off valve (10) for controlling and shutting off the transported gas.

5. The automatic coal mine gas air distribution system according to claim 1, characterized in that: The second pipeline (6) is provided with a flow meter (11) for measuring the gas flow inside the pipeline.

6. The coal mine gas automatic air distribution system according to claim 1, characterized in that: One end of the two connecting pipes (4) is provided with a flange (12).

Images