Low-concentration wind power utilization device

Abstract

The utility model provides a kind of low concentration ventilation air utilization equipment, including ventilation air branch, gas branch, mixer and mixed pipeline;Turbulence device is arranged inside mixer, and turbulence device separates the inside of mixer into import mixing cabin and export mixing cabin, and ventilation air branch and gas branch are connected import mixing cabin respectively, and mixed pipeline is connected export mixing cabin;The import of ventilation air branch is connected low concentration ventilation air, and the import of gas branch is connected high concentration gas gas;Ventilation air branch and gas branch are sequentially provided with hand valve, methane concentration sensor, dehydrator, flowmeter, pneumatic regulating valve and temperature sensor by import to mixer respectively.

Description

Technical Field

[0001] This utility model belongs to the field of coal mine ventilation and gas treatment, and in particular relates to a device for utilizing low-concentration exhaust gas. Background Technology

[0002] Methane gas is used to replace coal in mining areas and is recycled on-site. The heat generated is used to heat the mining area, for well insulation, and to provide hot water within the coal mine. High-concentration methane gas, as unconventional natural gas, is directly transported through pipelines to surrounding residential areas or factories for use as domestic fuel to meet residents' cooking and heating needs.

[0003] "Low-concentration exhaust gas," also known as "coal mine ventilation gas," is extracted from coal seams. Although low-concentration exhaust gas contains methane, it is more difficult to utilize because the methane content is less than 0.75%. Therefore, most coal mines can only release this exhaust gas into the atmosphere, resulting in a large waste of clean energy and significant greenhouse gas pollution. Utility Model Content

[0004] In view of this, the present invention aims to propose a low-concentration exhaust gas utilization device that can mix low-concentration exhaust gas with high-concentration methane gas in a certain proportion, and solve the problem of low-concentration exhaust gas being difficult to utilize according to the methane concentration required by the user or equipment.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A low-concentration waste air utilization device includes a waste air branch, a gas branch, a mixer, and a mixing pipeline; the mixer is equipped with a flow turbulence device that divides the interior of the mixer into an inlet mixing chamber and an outlet mixing chamber, the waste air branch and the gas branch are respectively connected to the inlet mixing chamber, and the mixing pipeline is connected to the outlet mixing chamber. The inlet of the exhaust air branch is connected to low-concentration exhaust air, and the inlet of the gas branch is connected to high-concentration gas. From the inlet to the mixer, the exhaust air branch and the gas branch are respectively equipped with a manual valve, a methane concentration sensor, a dehydrator, a flow meter, a pneumatic regulating valve, and a temperature sensor. A shut-off valve is installed on the exhaust air branch, located between the dehydrator and the flow meter. An emergency shut-off valve is installed on the gas branch, located between the dehydrator and the flow meter. From the mixer to the outlet, the mixing pipeline is equipped with a mixed methane concentration sensor, a mixed pressure sensor, and a manual butterfly valve.

[0006] Furthermore, multiple pressure sensors are respectively installed on the exhaust air branch and the gas branch. The multiple pressure sensors include a first pressure sensor installed between the hand valve and the dehydrator, a second pressure sensor installed between the dehydrator and the shut-off valve, and a third pressure sensor installed between the pneumatic regulating valve and the mixer.

[0007] Furthermore, the mixer is also equipped with a blockage detection device, which is used to detect the pressure difference between the inlet mixing chamber and the outlet mixing chamber. The blockage detection device includes a differential pressure gauge and a pressure tapping pipe.

[0008] Furthermore, the mixed methane concentration sensor includes a first mixed methane concentration sensor and a second mixed methane concentration sensor.

[0009] Furthermore, an overpressure protection device, including a safety vent valve, is also installed on the gas branch.

[0010] Furthermore, it also includes a gas leak detection device, which includes a combustible gas detection alarm.

[0011] Furthermore, it also includes a PLC controller, the signal input terminal of which is connected to the methane concentration sensor and flow meter respectively installed on the exhaust air branch and the gas branch; the signal output terminal of the PLC controller is connected to the pneumatic regulating valve respectively installed on the exhaust air branch and the gas branch.

[0012] Compared with existing technologies, the low-concentration waste air utilization device of this utility model has the following advantages: This invention relates to a low-concentration waste gas utilization device, comprising a waste gas branch, a gas branch, a mixer, and a mixing pipeline. It solves the problem of low methane concentration in waste gas, making it difficult to utilize. The principle is to proportionally mix low-concentration waste gas with high-concentration gas to increase the methane concentration in the waste gas, achieving the methane concentration required by the user or equipment. This helps reduce the use of clean energy and can reduce greenhouse gas pollution. Attached Figure Description

[0013] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a schematic diagram of the low-concentration exhaust gas utilization equipment described in an embodiment of the present invention.

[0014] Explanation of reference numerals in the attached figures: 1-Manual valve; 2-First pressure sensor; 3-Methane concentration sensor; 4-Dehydrator; 5-Second pressure sensor; 6-Shut-off valve; 7-Flow meter; 8-Pneumatic regulating valve; 9-Third pressure sensor; 10-Temperature sensor; 11-Exhaust air branch; 12-Gas branch; 13-Mixing pipeline; 14-Overpressure protection device; 15-Emergency shut-off valve device; 18-Inlet mixing chamber; 19-Outlet mixing chamber; 22-Mixer; 23-Blocking detection device; 24-Break current device; 25-First mixed methane concentration sensor; 26-Second mixed methane concentration sensor; 27-Mixing pressure sensor; 28-Manual butterfly valve. Detailed Implementation

[0015] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0016] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0017] like Figure 1 As shown, a low-concentration waste air utilization device includes a waste air branch line 11, a gas branch line 12, a mixer 22, and a mixing pipeline 13; the mixer 22 is equipped with a flow turbulence device 24, which divides the interior of the mixer 22 into an inlet mixing chamber 18 and an outlet mixing chamber 19. The waste air branch line 11 and the gas branch line 12 are respectively connected to the inlet mixing chamber 18, and the mixing pipeline 13 is connected to the outlet mixing chamber 19. The inlet of the exhaust air branch 11 is connected to low-concentration exhaust air, and the inlet of the gas branch 12 is connected to high-concentration gas. From the inlet to the mixer 22, the exhaust air branch 11 and the gas branch 12 are respectively equipped with a manual valve 1, a methane concentration sensor 3, a dehydrator 4, a flow meter 7, a pneumatic regulating valve 8, and a temperature sensor 10. The exhaust air branch 11 is equipped with a shut-off valve 6, located between the dehydrator 4 and the flow meter 7. The gas branch 12 is equipped with an emergency shut-off valve device 15, located between the dehydrator 4 and the flow meter 7. From the mixer 22 to the outlet, the mixing pipeline 13 is equipped with a mixed methane concentration sensor, a mixed pressure sensor 27, and a manual butterfly valve 28.

[0018] Specifically, manual valve 1 is used to manually open or close exhaust air branch 11 and gas branch 12 respectively; methane concentration sensor 3 is used to collect the methane concentration in the exhaust air branch 11 and gas branch 12 respectively; the low-concentration exhaust air extracted from underground contains a large amount of water vapor, which is dehydrated by dehydrator 4 to ensure the dryness of the gas; flow meter 7 is used to collect the gas flow rate in exhaust air branch 11 and gas branch 12 respectively, preferably a differential pressure flow meter; pneumatic regulating valve 8 is used to regulate the gas flow rate in exhaust air branch 11 and gas branch 12 respectively; temperature sensor 10 is used to collect the internal temperature of exhaust air branch 11 and gas branch 12 respectively. Specifically, shut-off valve 6 is used to shut off the exhaust gas branch 11 in an emergency; emergency shut-off valve device 15 is used to shut off the gas branch 12 in an emergency; the gas branch 12 is equipped with emergency shut-off valve device 15, which can promptly cut off the intake gas source in the event of a dangerous equipment failure, thereby ensuring safety; the emergency shut-off valve device 15 consists of two quick-shut-off valves to prevent gas from flowing through the pipeline when a single shut-off valve is fully closed; preferably, the quick-shut-off valve is a pneumatic quick-shut-off ball valve, and the use of pneumatic drive greatly reduces the valve closing time. At the same time, the control and feedback signals of the quick-shut-off valve are sent and received by the PLC control system. When the pressure, temperature, or gas concentration of the pressure equipment reaches the low-low limit or high-high limit shutdown interlock parameters, the PLC control system automatically sends a quick-shut-off valve closing signal.

[0019] Specifically, the mixer 22 is equipped with a flow-turbulence device 24, which continuously turbulent the two gases inside the mixer before sending them to the inlet of the user or equipment through the mixing pipeline 13. Specifically, the flow-turbulence device 24 uses a three-layer baffle plate made of 316 stainless steel, ensuring both the uniformity of the outlet gas mixing and the mixer's resistance to erosion.

[0020] It should be further noted that the high-concentration methane gas can be 8%, 20%, 70%, or other high-concentration methane gas, and can also be replaced with clean natural gas. Therefore, this device has fewer restrictions on the site and gas usage environment.

[0021] The working process of a low-concentration waste air utilization device is as follows: low-concentration waste air enters the mixer after passing through a manual valve, a dehydrator, a shut-off valve, a flow meter, and a pneumatic regulating valve; high-concentration methane gas enters the pneumatic regulating valve after passing through a manual valve, a dehydrator, an emergency shut-off device, a flow meter, and a pneumatic regulating valve; the gases in the waste air branch 11 and the methane branch 12 are mixed according to the flow rate and a predetermined methane concentration ratio, and then enter the mixer after the flow rate is controlled by the pneumatic regulating valve; the mixer contains a high-precision turbulence device, and after the two gases are continuously turbulent inside the mixer, they are sent to the air inlet of the user or equipment through the mixing pipeline 13.

[0022] In this preferred embodiment, a PLC controller is also included. The signal input terminal of the PLC controller is connected to the methane concentration sensor 3 and the flow meter 7 respectively installed on the exhaust air branch 11 and the gas branch 12; the signal output terminal of the PLC controller is connected to the pneumatic regulating valve 8 respectively installed on the exhaust air branch 11 and the gas branch 12. The low-concentration exhaust air and high-concentration gas undergo flow rate calculation and methane concentration ratio calculation by the central processing unit of the PLC controller. After flow control by the pneumatic regulating valves installed on the exhaust air branch 11 and the gas branch 12, the mixture enters the mixer, realizing automated control.

[0023] like Figure 1 As shown, multiple pressure sensors are also installed on the exhaust air branch 11 and the gas branch 12. These pressure sensors include a first pressure sensor 2 located between the hand valve 1 and the dehydrator 4, a second pressure sensor 5 located between the dehydrator 4 and the shut-off valve 6, and a third pressure sensor 9 located between the pneumatic regulating valve 8 and the mixer 22. Installing multiple pressure sensors allows for the observation of pressure data in different pipe sections, improving equipment operational safety.

[0024] like Figure 1 As shown, the mixer 22 is also equipped with a blockage detection device 23, which is used to detect the pressure difference between the inlet mixing chamber 18 and the outlet mixing chamber 19. The blockage detection device (23) includes a differential pressure gauge and a pressure tapping pipe. By detecting whether the mixer is blocked, the safety and stability are further improved. Preferably, the blockage detection device mainly consists of a differential pressure gauge and pressure tapping pipes before and after the flow turbulence device. When the flow turbulence device is blocked, the pressure before the flow turbulence device is higher than the pressure after it, and the differential pressure gauge will generate a larger differential pressure value.

[0025] like Figure 1 As shown, the mixed methane concentration sensor includes a first mixed methane concentration sensor 25 and a second mixed methane concentration sensor 26. The mixing pipeline 13 employs two methane analyzers for simultaneous monitoring and control, ensuring the stability and accuracy of the equipment.

[0026] An overpressure protection device 14 is also installed on the gas branch line 12. The overpressure protection device 14 includes a safety relief valve. The overpressure protection device is mainly composed of the safety relief valve. When the pipeline pressure is higher than the set pressure of the safety relief valve, the valve disc inside the safety relief valve rises away from the valve seat to automatically release the pressure. When the pressure is released to a level lower than the set pressure, the valve disc slowly descends back to the valve seat and stops releasing pressure.

[0027] It also includes a gas leak detection device 29, which comprises a combustible gas detector alarm. The gas leak detection device is distributed inside the equipment to detect gas leaks in real time, ensuring the safety and stability of personnel and equipment. Preferably, the gas leak device mainly consists of a combustible gas detector alarm and a combustible gas detection controller. When the combustible gas detector alarm detects a gas leak, it sends a signal to the combustible gas detection controller. Simultaneously, the combustible gas detector alarm's built-in audible and visual alarm light emits a buzzer and flashes an alarm. Upon receiving the signal from the combustible gas detector alarm, the combustible gas detection controller also sounds an alarm, displays the leak value in real time, and transmits the signal to the PLC control system in real time.

[0028] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A low-concentration exhausted air utilization device, characterized in that: It includes an exhausted air branch (11), a gas branch (12), a mixer (22) and a mixing pipeline (13); a flow disturbance device (24) is arranged inside the mixer (22), and the flow disturbance device (24) divides the interior of the mixer (22) into an inlet mixing chamber (18) and an outlet mixing chamber (19). The exhausted air branch (11) and the gas branch (12) are respectively connected to the inlet mixing chamber (18), and the mixing pipeline (13) is connected to the outlet mixing chamber (19). The inlet of the exhausted air branch (11) is connected to low-concentration exhausted air, and the inlet of the gas branch (12) is connected to high-concentration gas. On the exhausted air branch (11) and the gas branch (12), a manual valve (1), a methane concentration sensor (3), a dehydrator (4), a flowmeter (7), a pneumatic regulating valve (8) and a temperature sensor (10) are sequentially arranged from the inlet to the mixer (22). A cut-off valve (6) is arranged on the exhausted air branch (11), and the cut-off valve (6) is located between the dehydrator (4) and the flowmeter (7). An emergency cut-off valve device (15) is arranged on the gas branch (12), and the emergency cut-off valve device (15) is located between the dehydrator (4) and the flowmeter (7). On the mixing pipeline (13), a mixed methane concentration sensor, a mixed pressure sensor (27) and a manual butterfly valve (28) are sequentially arranged from the mixer (22) to the outlet.

2. The low-concentration exhausted air utilization device according to claim 1, wherein: A plurality of pressure sensors are also respectively arranged on the exhausted air branch (11) and the gas branch (12). The plurality of pressure sensors include a first pressure sensor (2) arranged between the manual valve (1) and the dehydrator (4), a second pressure sensor (5) arranged between the dehydrator (4) and the cut-off valve (6), and a third pressure sensor (9) arranged between the pneumatic regulating valve (8) and the mixer (22).

3. The low-concentration exhausted air utilization device according to claim 1, wherein: A blockage detection device (23) is also arranged on the mixer (22). The blockage detection device (23) is used to detect the pressure difference between the inlet mixing chamber (18) and the outlet mixing chamber (19). The blockage detection device (23) includes a differential pressure gauge and a pressure-taking pipe.

4. The low-concentration exhausted air utilization device according to claim 1, characterized in that: The mixed methane concentration sensor includes a first mixed methane concentration sensor (25) and a second mixed methane concentration sensor (26).

5. The low-concentration exhausted air utilization device according to claim 1, wherein: An overpressure protection device (14) is also arranged on the gas branch (12). The overpressure protection device (14) includes a safety relief valve.

6. The low-concentration exhausted air utilization device according to claim 1, wherein: It also includes a gas leakage detection device (29). The gas leakage detection device (29) includes a combustible gas detection alarm.

7. The low-concentration exhausted air utilization device according to claim 1, wherein: It also includes a PLC controller. The signal input end of the PLC controller is connected to the methane concentration sensor (3) and the flowmeter (7) respectively arranged on the exhausted air branch (11) and the gas branch (12). The signal output end of the PLC controller is connected to the pneumatic regulating valve (8) respectively arranged on the exhausted air branch (11) and the gas branch (12).

Images