Smoke abatement device capable of treating smoke of roots pump test bench

Abstract

The utility model discloses a smoke abatement device capable of treating smoke of a roots pump testboard. The smoke abatement device is used in the roots pump testboard. The smoke abatement mechanism is connected with the roots pump test bench through a smoke collecting pipe. The smoke abatement mechanism comprises a rack, a smoke abatement device and a smoke abatement device, a liquid ring pump; a gas-water separator; the first connecting pipe is connected with the liquid ring pump and the gas-water separator; a second connecting pipe is connected with the gas-water separator and a cooler; a third connecting pipe is connected with the cooler and the liquid ring pump, one end of a fourth connecting pipe is connected with the liquid ring pump, and the other end of the fourth connecting pipe is connected with an external water supply device; a first control valve is positioned on the third connecting pipe; the second control valve is located on the fourth connecting pipe, and the controller is connected with the first control valve and the second control valve. The liquid ring pump, the first connecting pipe, the gas-water separator, the second connecting pipe, the cooler, the third connecting pipe and the liquid ring pump are connected into a whole in a closed loop mode.

Description

Technical Field

[0001] The utility model relates to a smoke elimination device for a Roots pump, in particular to a smoke elimination device capable of treating the flue gas of a Roots pump test bench. Background Art

[0002] A Roots pump is a gas compression pump. After the Roots pump is assembled, performance tests of the flow rate and vacuum degree of the Roots pump need to be carried out. During the performance test of the Roots pump, a fore-vacuum pump capable of directly discharging to the atmosphere is required. During the performance test, the fore-vacuum pump compresses and discharges the air extracted by the Roots pump, so that the flow rate and vacuum degree of the Roots pump can be accurately measured. Among them, the performance test is usually carried out for multiple sets of Roots pumps at the same time. Each set of Roots pumps is equipped with a set of fore-vacuum pumps. The fore-vacuum pumps are generally rotary vane pumps or slide valve pumps. These pumps are oil hydraulic pumps. A large amount of flue gas discharged from the outlet of the fore-vacuum pump contains oil and water. If these flue gases are directly discharged into the air, a large amount of smoke will be generated, often making the production site filled with smoke, which not only pollutes the environment but also affects the production line of sight. Therefore, it is necessary to centrally collect the flue gases discharged from each test point of the Roots pump test bench and then properly treat them.

[0003] Among them, the liquid ring pump has the working characteristics of being oil-free, has the ability to extract condensable gases and gases containing fine particles (liquid droplets in oil mist), and has the ability to achieve clean production under harsh working conditions.

[0004] Avoiding the pollution caused by the direct external discharge of flue gas, purifying the air, and cleaning and beautifying the environment are problems that practitioners need to face and solve.

[0005] Therefore, the utility model hopes to propose a brand-new smoke elimination device capable of treating the flue gas of a Roots pump test bench to solve the above-mentioned defects in the prior art. Summary of the Utility Model

[0006] Therefore, the purpose of the present utility model is to solve the above problems in the prior art. A smoke elimination device is proposed in the present utility model for treating the flue gas of a Roots pump test bench. The smoke elimination device is used in a Roots pump test bench, and the Roots pump test bench includes: a plurality of Roots pump test devices; each Roots pump test device includes: a test cover; a Roots pump connected to the test cover; a fore-vacuum pump connected to the Roots pump; and a variety of detection instruments; the plurality of Roots pump test devices are used to perform performance tests such as gas extraction volume and vacuum degree on the Roots pump. During the test, the fore-vacuum pump evacuates the tested Roots pump, and then the fore-vacuum pump will discharge a large amount of flue gas; the flue gas has a relatively high temperature and contains impurities such as water and oil; the smoke elimination device includes: a flue gas collection pipe connected to each fore-vacuum pump for transporting the flue gas discharged by each fore-vacuum pump; a smoke elimination mechanism connected to the flue gas collection pipe for receiving the flue gas discharged by the fore-vacuum pump; wherein the smoke elimination mechanism includes: a frame; a liquid ring pump for extracting the flue gas generated by the Roots pump test bench; the liquid ring pump is installed on the top of the frame; a gas-water separator is installed below the frame; it is used to wash the oil mist contained in the flue gas with water; a first connecting pipe connects the liquid ring pump and the gas-water separator, and it is used to transport the flue gas from the liquid ring pump and the circulating water in the smoke elimination mechanism; a cooler is installed below the frame; a second connecting pipe connects the gas-water separator and the cooler; a third connecting pipe connects the cooler and the liquid ring pump for supplying the circulating water to the liquid ring pump; a fourth connecting pipe has one end connected to the liquid ring pump and the other end connected to an external water supply device, and the fourth connecting pipe provides the water in the external water supply device to the liquid ring pump; a first control valve is located on the third connecting pipe; a second control valve is located on the fourth connecting pipe, and a controller is connected to each first control valve and the second control valve for controlling the opening or closing of each control valve; the first control valve and the second control valve are used to adjust the water supply to the liquid ring pump by the third connecting pipe and the fourth connecting pipe; wherein the controller performs sequential control on the first control valve and the second control valve, that is, before the liquid ring pump starts to operate, the second control valve is opened, so the fourth connecting pipe is connected, enabling the external water supply device to supply water to the liquid ring pump. When there is enough water level in the liquid ring pump, the second control valve is closed, closing the passage of the fourth connecting pipe; when the second control valve is closed, the first control valve is opened, enabling the third connecting pipe to be connected to the liquid ring pump and inputting the circulating water into the liquid ring pump; thus achieving the purpose of transporting the water from the external water supply device and the circulating water in the pipelines of the gas-water separator and the cooler to the liquid ring pump located at a high position, so that there is sufficient water level in the pump cavity of the liquid ring pump to work properly before starting up and during normal operation; and wherein the liquid ring pump, the first connecting pipe, the gas-water separator, the second connecting pipe, the cooler, the third connecting pipe, and the liquid ring pump are connected in a closed loop to form a circulating water circuit.

[0007] Further, the third connecting pipe and the fourth connecting pipe are connected by a tee pipe, so that they can alternately supply water to the liquid ring pump at a high position.

[0008] Further, the cooler uses the water from the external water supply device as cooling water to reduce the temperature of the circulating water entering the liquid ring pump to ensure the long-term operation of the liquid ring pump, and at the same time improve the air extraction ability of the liquid ring pump.

[0009] Further, the first control valve and the second control valve are pneumatic ball valves.

[0010] Further, the gas-water separator separates the flue gas generated by the Roots pump test bench extracted by the liquid ring pump. The gas-water separator is a closed cylinder, which includes: a gas-water mixture inlet located above the cylinder, and one end of it is connected to the first connecting pipe; an exhaust port located at the top of the cylinder; and a drain port located below the cylinder, and one end of it is connected to the second connecting pipe; and

[0011] One end of the supplementary water supply pipes of the two gas-water separators is connected to a water inlet above the cylinder, and the other ends are respectively connected to the external water supply device, so that the external water supply device can supply water to the gas-water separator.

[0012] Further, the supplementary water supply pipes of the two gas-water separators are connected by a three-way valve.

[0013] Further, it also includes:

[0014] A third control valve and a fourth control valve are respectively located on the supplementary water supply pipes of the two gas-water separators, and are used to adjust the water supply in the supplementary water supply pipes of each gas-water separator; wherein the third control valve is connected to the controller.

[0015] Further, the fourth control valve is a manual control valve; when the third control valve fails, water can be added to the gas-water separator by opening the fourth control valve.

[0016] Further, the third control valve is a pneumatic ball valve; the fourth control valve is a manual ball valve.

[0017] Further, it also includes:

[0018] A liquid level gauge is located on the gas-water separator and is used to measure the water level of the gas-water separator; when the liquid level displayed by the liquid level gauge is lower than the set value, the sensor in the liquid level gauge sends a signal to turn on the third control valve to add water to the gas-water separator. When the liquid level displayed by the liquid level gauge is higher than another set value, the sensor in the liquid level gauge sends a signal again to close the third control valve and stop adding water to the gas-water separator. In this way, the automatic adjustment and control of the liquid level of the gas-water separator is realized.

[0019] Furthermore, the liquid level gauge is a magnetic liquid level gauge.

[0020] Furthermore, it further includes:

[0021] A thermometer is used to measure the water temperature of the circulating water in the smoke elimination mechanism.

[0022] Furthermore, it further includes:

[0023] A flow meter is used to measure the water flow of the circulating water in the smoke elimination mechanism.

[0024] Furthermore, it further includes:

[0025] An expansion joint flexible connection mechanism is located on the first connecting pipe. The expansion joint flexible connection mechanism is a metal elastic connection component, which can freely expand and contract when the first connecting pipe is subjected to external forces or internal force changes, and has good high-temperature resistance to effectively absorb the thermal expansion and contraction deformation and vibration of the first connecting pipe, thereby improving stability and reliability.

[0026] The beneficial effects of the present utility model are as follows: The device of the present utility model can treat the flue gas of the Roots pump test bench as the pre-stage. By washing the oil mist-containing flue gas with water and then discharging it, the direct discharge of the oil mist-containing flue gas into the environment is avoided. And through the sequential control of each control valve, the water in the peripheral pipeline and the circulating water in the third connecting pipe between the cooler and the liquid ring pump are supplied into the liquid ring pump located at a high position, so that there is sufficient water level in the pump chamber of the liquid ring pump before startup and during normal operation to enable normal operation. The smoke elimination device arranges the liquid ring pump on the upper layer and arranges the gas-water separator and the cooler on the lower layer, so that the smoke elimination device occupies a small plane position and effectively utilizes the space position. The equipment layout is presented with a small area occupation and a large space utilization. The design scheme is novel, highly integrated, neat and beautiful, and is worthy of popularization and application.

[0027] The features and advantages of the present utility model can be further understood from the following description. Please refer to the accompanying drawings when reading. Description of the Drawings

[0028] Figure 1 Showing a structural diagram of the present utility model;

[0029] Figure 2 Showing a structural plan view of the present utility model;

[0030] Figure 3 Showing a block diagram of the controller and each control valve of the present utility model;

[0031] Figure 4 Showing a schematic diagram of the smoke elimination device of the present utility model;

[0032] Figure 5 Show the structural diagram of the gas-water separator of the present utility model;

[0033] Figure 6 Show the schematic diagram of the external water supply device of the present utility model supplying water to the liquid ring pump;

[0034] Figure 7 Show the schematic diagram of the circulating water flow direction of the present utility model.

[0035] Explanation of reference numerals

[0036] 1. Frame; 2. Liquid ring pump; 3. Flue gas collection pipe; 6. Thermometer; 7. Flowmeter; 8. Cooler; 9. First control valve; 10. Second control valve; 11. Fourth connecting pipe; 12. Third connecting pipe; 13. Second connecting pipe; 14. Third control valve; 15. Fourth control valve; 16. Gas-water separator make-up water supply pipe; 17. Gas-water separator; 171. Gas-water mixture inlet; 172. Exhaust port; 173. Drain port; 174. Water inlet; 176. Three-way valve; 18. Liquid level gauge; 19. First connecting pipe; 20. Expansion joint flexible connection mechanism; 21. Gas discharge pipe; 100. Roots pump test bench; 101. Roots pump test device; 102. Test cover; 103. Roots pump; 104. Front-stage vacuum pump; 200. Smoke elimination mechanism; 112. External water supply device; 111. Three-way pipe; 113. Controller. Detailed implementation manners

[0037] Now, with respect to the structural composition of the present utility model, as well as the functions and advantages that can be achieved, in conjunction with the accompanying drawings, a preferred embodiment of the present utility model will be described in detail as follows.

[0038] Please refer to Figures 1 to 7 As shown, the smoke elimination device that can treat the flue gas of the Roots pump test bench of the present utility model includes the following components:

[0039] A Roots pump test bench 100 includes: a plurality of Roots pump test devices 101 (such as Figure 2 shown). Each Roots pump test device 101 includes:

[0040] A test cover 102;

[0041] A Roots pump 103 is connected to the test cover 102;

[0042] A front-stage vacuum pump 104 is connected to the Roots pump 103; and

[0043] A variety of detection instruments, etc.

[0044] The multiple Roots pump test devices 101 are used to test the performance of the Roots pump 103, such as the gas extraction volume and vacuum degree. During the test, the fore-vacuum pump 104 evacuates the Roots pump 103 being tested, and then the fore-vacuum pump 104 will discharge a large amount of flue gas. The flue gas has a relatively high temperature and contains impurities such as water and oil.

[0045] A flue gas collection pipe 3 is connected to each fore-vacuum pump 104 for transporting the flue gas discharged by each fore-vacuum pump 104.

[0046] A smoke elimination mechanism 200 is connected to the flue gas collection pipe 3 for receiving the flue gas discharged by the fore-vacuum pump 104 (as Figure 1 and Figure 2 shown). Among them, the smoke elimination mechanism 200 includes:

[0047] A frame 1;

[0048] A liquid ring pump 2 extracts the flue gas generated by the Roots pump test bench 100. The liquid ring pump 2 is installed on the top of the frame 1;

[0049] A gas-water separator 17 is installed below the frame 1.

[0050] A first connecting pipe 19 connects the liquid ring pump 2 and the gas-water separator 17, and is used to transport the flue gas from the liquid ring pump 2 and the circulating water in the smoke elimination mechanism 200.

[0051] A cooler 8 is installed below the frame 1.

[0052] A second connecting pipe 13 connects the gas-water separator 17 and the cooler 8).

[0053] A third connecting pipe 12 connects the cooler 8 and the liquid ring pump 2 for supplying the circulating water to the liquid ring pump 2.

[0054] A fourth connecting pipe 11 has one end connected to the liquid ring pump 2 and the other end connected to an external water supply device 112, and the fourth connecting pipe 11 supplies the water in the external water supply device 112 to the liquid ring pump 2.

[0055] Among them, the third connecting pipe 12 and the fourth connecting pipe 11 are connected by a three-way pipe 111 so that the liquid ring pump 2 at a high position can be supplied with water alternately.

[0056] A first control valve 9 is located on the third connecting pipe 12;

[0057] A second control valve 10 is located on the fourth connecting pipe 11, and

[0058] A controller 113 is connected to each first control valve 9 and the second control valve 10 for controlling the opening or closing of each control valve (asFigure 3 as shown

[0059] The first control valve 9 and the second control valve 10 are used to regulate the water supply to the liquid ring pump 2 by the third connecting pipe 12 and the fourth connecting pipe 11. Preferably, the first control valve 9 and the second control valve 10 are pneumatic ball valves.

[0060] The controller 113 performs timing control on the first control valve 9 and the second control valve 10, that is, before the liquid ring pump 2 starts to operate, the second control valve 10 is opened, so the fourth connecting pipe 11 is connected, enabling the external water supply device 112 to supply water to the liquid ring pump 2 (as Figure 6 shown). After there is enough water level in the liquid ring pump 2, the second control valve 10 is closed, closing the passage of the fourth connecting pipe 11. When the second control valve 10 is closed, the first control valve 9 is opened, connecting the third connecting pipe 12 to the liquid ring pump 2 to input circulating water into the liquid ring pump 2. In this way, the water from the external water supply device 112 and the circulating water in the pipelines of the gas-water separator 17 and the cooler 8 are transported to the liquid ring pump 2 located at a high position, so that there is sufficient water level in the pump chamber of the liquid ring pump 2 to work properly before starting up and during normal operation.

[0061] such as Figure 7 shown, where the liquid ring pump 2, the first connecting pipe 19, the gas-water separator 17, the second connecting pipe 13, the cooler 8, the third connecting pipe 12, and the liquid ring pump 2 are connected in a closed loop to form a circulating water circuit under the action of the liquid ring pump 2.

[0062] The cooler 8 is used to reduce the temperature of the circulating water entering the liquid ring pump 2. Since the liquid ring pump 2 uses water as the working medium for air extraction, if the working medium temperature is relatively high, it will not only cause a relatively serious decrease in the suction volume of the liquid ring pump 2, but also easily cause cavitation and damage to the liquid ring pump 2. By reducing the temperature of the circulating water entering the liquid ring pump 2 through the cooler 8, the long-term operation of the liquid ring pump 2 can be ensured, and at the same time, the air extraction capacity of the liquid ring pump 2 can be improved.

[0063] such as Figure 5 shown, the gas-water separator 17 separates the flue gas generated by the roots pump test bench 100 extracted by the liquid ring pump 2. The gas-water separator 17 is a closed cylinder, which includes:

[0064] A gas-water mixture inlet 171 is located above the cylinder and connects one end of the first connecting pipe 19;

[0065] An exhaust port 172 is located at the top of the cylinder; and

[0066] A drain port 173 is located below the cylinder body and is connected to one end of the second connecting pipe 13.

[0067] One end of each of the two water and gas separator supplementary water supply pipes 16 is connected to a water inlet 174 above the cylinder body, and the other ends are respectively connected to the external water supply device 112, so that the external water supply device 112 can supply water to the water and gas separator 17. The purpose of the water supply is to wash the oil mist contained in the flue gas with water. The two water and gas separator supplementary water supply pipes 16 are connected by a three-way valve 176, so that the two water and gas separator supplementary water supply pipes 16 can both communicate with the water inlet 174.

[0068] A third control valve 14 and a fourth control valve 15 are respectively located on the two water and gas separator supplementary water supply pipes 16 for adjusting the water supply in each water and gas separator supplementary water supply pipe 16. The third control valve 14 is connected to the controller 113.

[0069] Since the specific gravity of the gas phase and the liquid phase of water is different and the difference is significant, the gas in the flue gas gradually separates from the water naturally under a certain saturation pressure. The gas in the flue gas is discharged upward through the exhaust port 172 and is transported through a gas discharge pipe 21 to a trench (not shown in the figure) for further collection and treatment, so as to avoid the direct discharge of the gas in the flue gas to pollute the environment. The water in the flue gas remains in the cylinder body, thus achieving the purpose of gas-water separation.

[0070] The fourth control valve 15 is a manual control valve. When the third control valve 14 fails, the water can be supplemented to the water and gas separator 17 by opening the fourth control valve 15. Preferably, the third control valve 14 is a pneumatic ball valve; the fourth control valve 15 is a manual ball valve.

[0071] A liquid level gauge 18 is located on the water and gas separator 17 for measuring the water level of the water and gas separator 17. The liquid level gauge 18 is a magnetic liquid level gauge, which measures and displays the liquid level by the movement of a magnetic float. When the liquid level display of the liquid level gauge 18 is lower than the set value, a sensor (not shown in the figure) in the liquid level gauge 18 sends a signal to turn on the third control valve 14 to supplement water to the water and gas separator 17. When the liquid level display of the liquid level gauge 18 is higher than another set value, the sensor of the liquid level gauge 18 sends a signal again to turn off the third control valve 14 and stop supplementing water to the water and gas separator 17, thus achieving the automatic adjustment and control of the liquid level of the water and gas separator 17.

[0072] The present utility model further includes:

[0073] A thermometer 6 is used for measuring the water temperature of the circulating water in the smoke elimination mechanism 200.

[0074] A flow meter 7 is used to measure the water flow rate of the circulating water in the fume elimination mechanism 200. Through the real-time monitoring of the thermometer 6 and the flow meter 7, the stability of the water temperature and the water volume is ensured, thereby ensuring the stable operation of the liquid ring pump 2.

[0075] An expansion joint flexible connection mechanism 20 is located on the first connecting pipe 19. The expansion joint flexible connection mechanism 20 is a metal elastic connection component that can freely expand and contract when the first connecting pipe 19 is subjected to external forces or internal force changes. It has good high-temperature resistance and can effectively absorb the thermal expansion and contraction deformation and vibration of the first connecting pipe 19, protecting the first connecting pipe 19 from damage, thereby improving stability and reliability. Since the outlet pipeline of the liquid ring pump 2 has a relatively high temperature, installing the expansion joint flexible connection mechanism 20 on the first connecting pipe 19 can avoid the deformation and damage of the outlet pipeline and reduce the vibration of the outlet pipeline at the same time.

[0076] The advantages of the present utility model are that the device of the present utility model can treat the flue gas of a Roots pump test bench as a pre-stage. By washing the oil mist-containing flue gas with water and then discharging it, the direct external discharge of the oil mist-containing flue gas and environmental pollution are avoided. And through the sequential control of each control valve, the water in the peripheral pipeline and the circulating water in the third connecting pipe 12 between the cooler 8 and the liquid ring pump 2 are supplied into the liquid ring pump 2 located at a high position, so that there is sufficient water level in the pump chamber of the liquid ring pump 2 before startup and during normal operation to enable normal operation. The fume elimination device arranges the liquid ring pump 2 in the upper layer and arranges the gas-water separator 17 and the cooler 8 in the lower layer, so that the fume elimination device occupies a small planar position and effectively utilizes the space position. The equipment layout is presented with a small area occupation and a large space utilization. The design scheme is novel, ingenious, highly integrated, neat and beautiful, and is worthy of popularization and application.

[0077] The above detailed description is a specific description of a feasible embodiment of the present utility model, but this embodiment is not intended to limit the patent scope of the present utility model. Any equivalent implementation or modification made without departing from the technical spirit of the present utility model shall be included in the patent scope of the present utility model.

Claims

1. A smoke elimination device for treating the flue gas of a Roots pump test bench, characterized in that, The smoke elimination device is used in a Roots pump test bench (100), which includes: a plurality of Roots pump test devices (101); each Roots pump test device (101) includes: a test cover (102); a Roots pump (103) connected to the test cover (102); a fore-vacuum pump (104) connected to the Roots pump (103); and a variety of detection instruments. The smoke elimination device includes: A flue gas collection pipe (3) is connected to each fore-vacuum pump (104); A smoke elimination mechanism (200) is connected to the flue gas collection pipe (3); Wherein the smoke elimination mechanism (200) includes: A frame (1); A liquid ring pump (2), which is installed on the top of the frame (1); A gas-water separator (17) is installed below the frame (1); A first connecting pipe (19) connects the liquid ring pump (2) and the gas-water separator (17); A cooler (8) is installed below the frame (1); A second connecting pipe (13) connects the gas-water separator (17) and the cooler (8); A third connecting pipe (12) connects the cooler (8) and the liquid ring pump (2); A fourth connecting pipe (11) has one end connected to the liquid ring pump (2) and the other end connected to an external water supply device (112); A first control valve (9) is located on the third connecting pipe (12); A second control valve (10) is located on the fourth connecting pipe (11), and A controller (113) is connected to the first control valve (9) and the second control valve (10); Wherein the controller (113) performs sequential control on the first control valve (9) and the second control valve (10); Wherein the liquid ring pump (2), the first connecting pipe (19), the gas-water separator (17), the second connecting pipe (13), the cooler (8), the third connecting pipe (12), and the liquid ring pump (2) are connected in a closed loop to form a circulating water circuit under the action of the liquid ring pump (2).

2. The smoke elimination device capable of treating the flue gas of the Roots pump test bench according to claim 1, wherein, The third connecting pipe (12) and the fourth connecting pipe (11) are connected by a tee (111).

3. The smoke elimination device capable of treating the flue gas of the Roots pump test bench according to claim 1, characterized in that, The first control valve (9) and the second control valve (10) are pneumatic ball valves.

4. The smoke elimination device capable of treating the flue gas of the Roots pump test bench according to claim 1, characterized in that, The gas-water separator (17) is a closed cylinder, which includes: a gas-water mixture inlet (171) located above the cylinder and connected to one end of the first connecting pipe (19); an exhaust port (172) located at the top of the cylinder; and a drain port (173) located below the cylinder and connected to one end of the second connecting pipe (13); and One end of two gas-water separator makeup water supply pipes (16) is connected to a water inlet (174) above the cylinder, and the other ends are respectively connected to the external water supply device (112), so that the external water supply device (112) can supply water to the gas-water separator (17).

5. The smoke elimination device capable of treating the flue gas of the Roots pump test bench according to claim 4, characterized in that, The two gas-water separator makeup water supply pipes (16) are connected by a three-way valve (176).

6. The smoke elimination device capable of treating the flue gas of the Roots pump test bench according to claim 4, characterized in that It further includes: A third control valve (14) and a fourth control valve (15) are respectively located on the two gas-water separator makeup water supply pipes (16), wherein the third control valve (14) is connected to the controller (113).

7. The smoke elimination device for treating the flue gas of the Roots pump test bench according to claim 6, characterized in that, The fourth control valve (15) is a manual control valve.

8. The smoke elimination device for treating the flue gas of the Roots pump test bench according to claim 6, characterized in that, The third control valve (14) is a pneumatic ball valve; the fourth control valve (15) is a manual ball valve.

9. The smoke elimination device capable of treating the flue gas of the Roots pump test bench according to claim 6, characterized in that, It further includes: A liquid level gauge (18) is located on the gas-water separator (17); when the liquid level display of the liquid level gauge (18) is lower than a set value, the sensor in the liquid level gauge (18) sends a signal to turn on the third control valve (14) to replenish water to the gas-water separator (17). When the liquid level display of the liquid level gauge (18) is higher than another set value, the sensor of the liquid level gauge (18) sends a signal again to close the third control valve (14) and stop replenishing water to the gas-water separator (17).

10. The smoke elimination device capable of treating the flue gas of the Roots pump test bench according to claim 9, wherein, The liquid level gauge (18) is a magnetic liquid level gauge.

11. The smoke elimination device for treating the flue gas of the Roots pump test bench according to claim 1, characterized in that, It further includes: A thermometer (6) measures the water temperature of the circulating water in the smoke elimination mechanism (200).

12. The smoke elimination device capable of treating the flue gas of the Roots pump test bench according to claim 1, characterized in that, It further includes: A flow meter (7) measures the water flow rate of the circulating water in the smoke elimination mechanism (200).

13. The smoke elimination device for treating the flue gas of the Roots pump test bench according to claim 1, characterized in that, It further includes: An expansion joint flexible connection mechanism (20) is located on the first connecting pipe (19), and the expansion joint flexible connection mechanism (20) is a metal elastic connection component.

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