Equipment for treating waste gas by spraying

Abstract

The utility model relates to the field of waste gas treatment, and discloses waste gas spraying treatment equipment which comprises a spraying tower, a spraying device, a circulating pump and a control device, and the spraying tower is provided with a detection device for detecting the gas inflow; the spraying device is arranged in the spraying tower and is used for spraying spraying liquid into the spraying tower; the circulating pump is connected between the spray tower and the spray device and is used for circularly conveying spray liquid in the spray tower into the spray device; the control device is electrically connected with the detection device and the circulating pump and controls the power of the circulating pump for conveying the spraying liquid so that the spraying amount of the spraying liquid can be in direct proportion to the air inflow. The waste gas spraying treatment equipment provided by the utility model can solve the problem of how to automatically adjust the spraying amount according to the air inlet amount.

Description

Technical Field

[0001] The utility model relates to the field of waste gas treatment, in particular to a device for spraying waste gas. Background Art

[0002] The main components of polycarboxylic acid water-reducing agent waste gas usually include volatile organic compounds (mainly acidic substances), tiny particles, trace harmful gases and a small amount of incompletely burned organic matter. The components are diverse and relatively complicated to handle.

[0003] The prior art discloses a device for treating waste gas in the production process of polycarboxylic acid water-reducing agent, which includes an alkali washing tower, an induced draft fan and a circulating pump. The alkali washing tower is connected to the exhaust port of the equipment through an exhaust pipe, and an exhaust valve is installed on the pipe to control the flow of the waste gas. The alkali washing tower is equipped with a spray system. When the device for treating waste gas is used, first open the liquid inlet valve to inject alkali solution into the bottom of the alkali washing tower, and then start the circulating pump and the spray system. The circulating pump pumps the alkali solution at the bottom of the alkali washing tower to the spraying part of the tower, thereby circulating and spraying the alkali solution. Then, open the exhaust valve and the induced draft fan to allow the waste gas to enter the alkali washing tower, fully contact and react with the alkali solution, and play a role in treating the waste gas of the polycarboxylic acid water-reducing agent.

[0004] However, the exhaust gas volume is not constant during the production of polycarboxylate water-reducing agent. For example, the exhaust gas volume is large at the beginning of the reaction, and it decreases at the end of the reaction. The exhaust gas treatment device cannot automatically adjust the spray volume according to the intake volume of the exhaust gas. Therefore, when the intake volume is large and the spray volume is insufficient, the exhaust gas treatment effect is not ideal. When the intake volume is small and the spray volume is too much, the spray energy consumption of the circulation pump is large. Utility Model Content

[0005] 1. Technical issues to be solved

[0006] The utility model provides a device for spraying waste gas, which can at least solve the technical problem of how to automatically adjust the spraying volume according to the size of the air intake volume.

[0007] (II) Technical solution

[0008] In order to solve the above technical problems, the utility model provides the following technical solutions: a device for spraying waste gas, comprising:

[0009] Spray tower, the spray tower is equipped with a detection device for detecting the air intake volume;

[0010] A spray device, arranged in the spray tower, for spraying spray liquid into the spray tower;

[0011] A circulation pump is connected between the spray tower and the spray device, and is used to circulate the spray liquid in the spray tower to the spray device;

[0012] The control device is electrically connected with the detection device and the circulation pump, and controls the power of the circulation pump to deliver the spray liquid so that the spraying amount of the spray liquid is proportional to the air intake amount.

[0013] It is further provided that the equipment for spraying waste gas treatment also includes a PH monitoring device, which is arranged in the spray tower and is used to detect the PH value of the spray liquid in the spray tower. The spray tower is provided with a discharge port, and the discharge port is provided with a discharge valve, which is used to control the opening and closing of the discharge port;

[0014] The control device is also electrically connected to the PH monitoring device and the discharge valve. When the PH value obtained by the PH monitoring device reaches a preset range, the control device controls the discharge valve to open.

[0015] It is further configured that the aforementioned spray tower is provided with a liquid inlet for inputting spray liquid, the liquid inlet is connected to a water inlet pipe and a liquid alkali input pipe, both the water inlet pipe and the liquid alkali input pipe are provided with a liquid inlet valve, the control device is also electrically connected to the liquid inlet valve, and controls the opening and closing of the liquid inlet valve.

[0016] It is further configured that the equipment for spraying waste gas treatment also includes a weighing device, which is arranged in the spray tower and is used to measure the weight of the spray liquid input into the liquid inlet. The control device is also electrically connected to the weighing device and controls the opening and closing of the weighing device.

[0017] It is further configured that the equipment for spraying waste gas treatment also includes a discharge pump, the discharge port is connected to the liquid inlet end of the discharge pump, and the control device is also electrically connected to the discharge pump and controls the opening and closing of the discharge pump.

[0018] It is further provided that the liquid outlet end of the aforementioned circulation pump is connected to a circulation liquid outlet main pipe, and a check valve is provided on the circulation liquid outlet main pipe, and the check valve is used to limit the flow of the spray liquid toward the spray device.

[0019] It is further arranged that the liquid outlet end of the aforementioned circulation pump is connected to a circulation liquid outlet main pipe, and a plurality of circulation liquid outlet branch pipes are connected in parallel to the output end of the circulation liquid outlet main pipe. The number of the circulation liquid outlet branch pipes is the same as the number of the spray devices and are connected one by one. The spray devices are arranged at intervals along the vertical direction of the spray tower. A switch valve is provided at the input end of the circulation liquid outlet branch pipe. The control device is also electrically connected to the switch valve and controls the connection or cutoff of the circulation pump and the corresponding spray device.

[0020] It is further arranged that a packing layer is also provided in the aforementioned spray tower, the number of the packing layers is the same as the number of the spray devices, and they correspond one to one, and the packing layers are arranged below the corresponding spray devices.

[0021] It is further arranged that the aforementioned circulation pump is a variable frequency pump.

[0022] (III) Beneficial effects

[0023] Compared with the prior art, the device for spraying waste gas provided by the utility model has the following beneficial effects:

[0024] When the equipment for treating waste gas by spraying provided by the utility model is used, the circulation pump is started to extract the spray liquid in the spray tower and pump it into the spray device, and the spray device then sprays the spray liquid back into the spray tower, so that the spray liquid circulates in the spray tower. When the waste gas is input into the spray tower, the waste gas rises and fully reacts with the spray liquid sprayed by the spray device. At the same time, the detection device detects the air intake volume and sends it to the control device. The control device controls the power of the circulation pump for conveying the spray liquid according to the air intake volume of the waste gas. When the air intake volume increases, the power of the circulation pump is controlled to increase accordingly, thereby increasing the spraying volume of the spray liquid, so as to avoid the problem of unsatisfactory waste gas treatment effect due to insufficient spraying volume. On the contrary, when the air intake volume decreases, the power of the circulation pump is controlled to decrease accordingly, thereby reducing the spraying volume of the spray liquid and reducing the energy consumption required for the circulation pump to convey the spray liquid. It can be seen that the equipment for spraying waste gas treatment can monitor and measure the emission of waste gas, and automatically adjust the power of the circulation pump, so as to achieve the effect of automatically adjusting the spraying volume according to the air intake volume, which not only ensures the waste gas treatment effect, but also reduces the energy consumption of the circulation pump, thereby reducing electricity consumption and achieving energy-saving effect. Compared with the existing waste gas treatment equipment, it is more suitable for treating the situation where the waste gas emission is not constant during the production process of polycarboxylic acid water reducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a connection diagram of the equipment for spraying waste gas treatment in the embodiment.

[0026] Figure Number:

[0027] 1. Spray tower; 11. Liquid inlet; 12. Air inlet; 13. Liquid outlet; 14. Air outlet; 15. Liquid inlet valve; 16. Discharge port; 17. Water inlet pipe; 18. Liquid alkali input pipe; 19. Packing layer;

[0028] 2. Weighing device; 3. Spraying device;

[0029] 4. Circulation pump; 41. Switch valve; 42. Circulation outlet main pipe; 43. Check valve; 44. Circulation outlet branch pipe;

[0030] 5. Control device; 6. Detection device; 7. PH monitoring device;

[0031] 8. Discharge pump; 81. Discharge valve. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by conventional technicians in this field without creative work are within the scope of protection of the utility model.

[0033] The utility model provides a device for spraying waste gas, which is used to solve the problem of how to automatically adjust the spraying volume according to the size of the air intake volume.

[0034] See also Figure 1 As shown, Figure 1 Schematic diagram of the connection of the equipment for spraying waste gas in the embodiment, the equipment for spraying waste gas comprises a spray tower 1, a spray device 3, a circulation pump 4 and a control device 5.

[0035] A detection device 6 is installed on the spray tower 1 , and the detection device 6 is used to detect the intake volume of the exhaust gas into the spray tower 1 .

[0036] The spray device 3 is installed in the spray tower 1 , and is used to spray spray liquid into the spray tower 1 .

[0037] The circulation pump 4 is connected between the spray tower 1 and the spray device 3, and is used to circulate the spray liquid in the spray tower 1 to the spray device 3;

[0038] The control device 5 is electrically connected to the detection device 6 and the circulation pump 4, and controls the power of the circulation pump 4 to deliver the spray liquid so that the spraying amount of the spray liquid is proportional to the intake amount of the exhaust gas.

[0039] When the equipment for spraying waste gas treatment provided by the above technical solution is used, the circulation pump 4 is started, the circulation pump 4 extracts the spray liquid in the spray tower 1 and pumps it into the spray device 3, and the spray device 3 sprays the spray liquid back into the spray tower 1, so that the spray liquid circulates in the spray tower 1. When the waste gas is input into the spray tower 1, the waste gas rises and fully reacts with the spray liquid sprayed by the spray device 3. At the same time, the detection device 6 detects the air intake and sends it to the control device 5. The control device 5 controls the power of the circulation pump 4 to transport the spray liquid according to the air intake of the waste gas. When the air intake increases, the power of the circulation pump 4 is controlled to increase accordingly, thereby increasing the spraying amount of the spray liquid, so as to avoid the problem of unsatisfactory waste gas treatment effect due to insufficient spraying amount. On the contrary, when the air intake decreases, the power of the circulation pump 4 is controlled to decrease accordingly, thereby reducing the spraying amount of the spray liquid and reducing the energy consumption required for the circulation pump 4 to transport the spray liquid. It can be seen that the equipment for spraying waste gas treatment can monitor and measure the emission of waste gas, and automatically adjust the power of the circulation pump 4, so as to achieve the effect of automatically adjusting the spraying amount according to the air intake, which not only ensures the waste gas treatment effect, but also reduces the energy consumption of the circulation pump 4, thereby reducing electricity consumption and achieving energy-saving effect. Compared with the existing equipment for treating waste gas, it is more suitable for treating the situation where the waste gas emission is not constant during the production process of polycarboxylic acid water reducer.

[0040] In this embodiment, the spray tower 1 has a liquid inlet 11, an air inlet 12, a liquid outlet 13 and an air outlet 14, wherein the liquid inlet 11 is used to input the spray liquid for treating the waste gas; the air inlet 12 is used to input the waste gas, and can be connected to the exhaust pipe of the polycarboxylic acid water reducer production equipment, and the detection device 6 can use an existing vortex flowmeter, which can be installed on the air inlet 12 or the exhaust pipe, and is used to measure the flow of the waste gas entering the spray tower 1, so as to obtain the air intake volume; the liquid outlet 13 is located at the bottom of the spray tower 1, and the liquid outlet 13 of the spray tower 1 is connected to the liquid inlet end of the circulation pump 4 through a pipeline; the air outlet 14 is located at the top of the spray tower 1. In this way, the spray liquid input into the spray tower 1 flows downward and is concentrated at the bottom of the spray tower 1 so as to be extracted by the circulation pump 4, while the waste gas rises in the spray tower 1, and is discharged from the top of the spray tower 1 after being sprayed.

[0041] The above-mentioned spray device 3 can use existing spray devices such as nozzles and spray pipes, and the spray device 3 is located between the air inlet 12 and the air outlet 14 to ensure that the exhaust gas entering the spray tower 1 will be sprayed by the spray device 3 before rising and being discharged from the air outlet 14.

[0042] The equipment for spraying waste gas treatment also includes a PH monitoring device 7, which is installed in the spray tower 1 and is used to detect the PH value of the spray liquid in the spray tower 1. The spray tower 1 has a discharge port 16, and a discharge valve 81 is installed on the discharge port 16. The discharge valve 81 is used to control the opening and closing of the discharge port 16. The control device 5 is also electrically connected to the PH monitoring device 7 and the discharge valve 81. When the PH value obtained by the PH monitoring device 7 reaches a preset range, the control device 5 controls the discharge valve 81 to open. In this way, since the spray liquid in the spray tower 1 reacts with the waste gas, the PH value of the spray liquid will change accordingly. When the PH monitoring device 7 detects that the PH value of the spray liquid reaches a preset range, the equipment for spraying waste gas treatment can automatically discharge the spray liquid (i.e., waste liquid) after the PH value reaches the standard. The waste liquid can be discharged to an external waste liquid pool for treatment and then reused for compounding production.

[0043] The above-mentioned PH monitoring device 7 can use the existing PH online measuring instrument. In addition to being directly installed inside or outside the spray tower 1, it can also be connected to the bottom of the spray tower 1 through a pipeline. Regardless of the installation method, it is only necessary to ensure that the PH monitoring device 7 can monitor the PH value of the spray liquid flowing to the bottom of the spray tower 1.

[0044] In one embodiment of the spray tower 1, the spray tower 1 has a liquid inlet 11, the liquid inlet 11 is connected to a water inlet pipe 17 and a liquid alkali input pipe 18, and a liquid inlet valve 15 is installed on the water inlet pipe 17 and the liquid alkali input pipe 18. The control device 5 is also electrically connected to the liquid inlet valve 15, and controls the opening and closing of the liquid inlet valve 15 to control the input amount of water and liquid alkali. In this way, the spray liquid is prepared by mixing water and liquid alkali in proportion. The equipment for spraying and treating waste gas can control the flow of water and liquid alkali input into the spray tower 1 at the same time through two liquid inlet valves 15, thereby controlling the mixing ratio of water and liquid alkali to ensure that the concentration of the prepared spray liquid meets the use concentration requirements. And the above-mentioned pH monitoring device 7 can automatically detect the pH value of the prepared spray liquid, further ensuring that the concentration of the prepared spray liquid meets the use concentration requirements.

[0045] The equipment for spraying waste gas treatment also includes a weighing device 2, which is installed in the spray tower 1 and is used to measure the weight of the spray liquid input into the liquid inlet 11. The control device 5 is also electrically connected to the weighing device 2 and controls the opening and closing of the weighing device 2. During the waste gas treatment process, if the weight of the spray liquid in the spray tower 1 is lower than the preset value due to factors such as discharge or consumption, the control device 5 opens the liquid inlet valve 15 and starts the weighing device 2 to replenish the spray liquid in time until the weight of the replenished spray liquid reaches the preset range, and the control device 5 closes the liquid inlet valve 15 and the weighing device 2 again. It can be seen that the equipment for spraying and treating waste gas can automatically and quantitatively input the spray liquid into the spray tower 1 through the cooperation of the control device 5, the liquid inlet valve 15 and the weighing device 2, so as to avoid waste caused by excessive spray liquid in the spray tower 1 and reduce the amount of waste liquid treated, thereby achieving the effect of emission reduction. The spray liquid can also be automatically replenished to ensure that the equipment for spraying and treating waste gas has sufficient spray liquid for treating waste gas, thereby ensuring the waste gas treatment effect.

[0046] When all the waste liquid in the spray tower 1 is discharged from the spray tower 1, the weighing device can also send a weightless signal to the control device 5. When the control device 5 receives the signal sent by the weighing device or the PH monitoring device 7, the control device 5 automatically closes the discharge valve 81, stops discharging, and automatically replenishes new spray liquid. It can be seen that the spray treatment equipment for waste gas can also automatically stop discharging waste liquid through the cooperation of the control device 5, the liquid inlet valve 15 and the weighing device 2, and has a high degree of automation.

[0047] The weighing device 2 can use existing weighing equipment and can be installed at the bottom of the spray tower 1. Since the spray liquid will be concentrated at the bottom of the spray tower 1, the weighing device 2 at the bottom of the spray tower 1 can accurately measure the weight of the spray liquid input into the spray tower 1.

[0048] The equipment for spraying waste gas treatment also includes a discharge pump 8, and the discharge port 16 is connected to the liquid inlet end of the discharge pump 8 through a pipeline. The control device 5 is also electrically connected to the discharge pump 8 and controls the opening and closing of the discharge pump 8. In this way, when the pH value obtained by the pH monitoring device 7 reaches a preset range, the control device 5 controls the discharge valve 81 to open the discharge port 16 to discharge the waste liquid from the spray tower 1. At the same time, the control device 5 controls the discharge pump 8 to start. After the discharge is completed, the control device 5 controls the discharge valve 81 and the discharge pump 8 to close. The equipment for spraying waste gas treatment can greatly increase the discharge speed of the waste liquid through the discharge pump 8, thereby improving the waste gas treatment efficiency of the equipment for spraying waste gas treatment.

[0049] In one embodiment of the circulation pump 4, the liquid outlet end of the circulation pump 4 is connected to a circulation liquid outlet main pipe 42, and a check valve 43 is installed on the circulation liquid outlet main pipe 42, and the check valve 43 is used to limit the spray liquid from flowing toward the spray device 3. In this way, the check valve 43 can effectively prevent the spray liquid from flowing back to the circulation pump 4 along the circulation liquid outlet main pipe 42 when the circulation pump 4 is turned off, and causing impact on the inside of the circulation pump 4, thereby damaging the circulation pump 4.

[0050] In one embodiment of the circulation pump 4, the liquid outlet end of the circulation pump 4 is connected to a circulation liquid outlet main pipe 42, and the output end of the circulation liquid outlet main pipe 42 is integrally connected or connected in parallel with a plurality of circulation liquid outlet branches 44 through a three-way valve. The number of the circulation liquid outlet branches 44 is the same as the number of the spray devices 3 and corresponds one to one. The output end of the circulation liquid outlet branch pipe 44 is connected to the liquid inlet end of the corresponding spray device 3, and each spray device 3 is distributed at intervals along the vertical direction of the spray tower 1. A switch valve 41 is installed at the input end of the circulation liquid outlet branch pipe 44, and the control device 5 is also electrically connected to the switch valve 41, and controls the connection or cutoff of the circulation pump 4 and the corresponding spray device 3. In this way, when the equipment for spraying and treating waste gas is used, the circulation pump 4 draws the spray liquid in the spray tower 1, and pumps it into the spray device 3 through the circulation liquid outlet main pipe 42 and the circulation liquid outlet branch pipe 44 in turn. When the air intake volume increases, the control device 5 increases the number of opened switch valves 41 (that is, increases the spray device 3 connected to the circulation pump 4) to increase the spray range of the spray liquid, so that the spray liquid can fully and thoroughly react with the waste gas, thereby ensuring the waste gas treatment effect. Conversely, when the air intake volume decreases, the control device 5 reduces the number of opened switch valves 41 (that is, reduces the spray device 3 connected to the circulation pump 4) to reduce the spray range of the spray liquid, thereby reducing the spray energy consumption of the circulation pump 4. It can be seen that the equipment for spraying and treating exhaust gas can control the number of open switch valves 41 according to the air intake volume, thereby controlling the number of spray devices 3 connected to the circulation pump 4, and realizing the effect of automatic graded spraying according to the air intake volume. It can ensure that the exhaust gas and the spray liquid fully react and ensure the exhaust gas treatment effect, and can reduce the spraying energy consumption of the circulation pump 4, thereby achieving the effect of energy saving and emission reduction.

[0051] The above-mentioned switch valve 41 is installed at the input end of the circulating liquid outlet branch pipe 44. In this way, when the circulating pump 4 circulates and delivers the spray liquid, the circulating liquid outlet main pipe 42 can flow a large amount of spray liquid directly into the circulating liquid outlet branch pipe 44 opened by the switch valve 41 for large-flow circulation, effectively reducing the accumulation of spray liquid in the cut-off circulating liquid outlet branch pipe 44, so as to avoid a significant reduction in the spray liquid actually in the circulating spraying, affecting the exhaust gas treatment effect.

[0052] In this embodiment, there are three spray devices 3. The equipment for spraying and treating waste gas divides the intake volume of waste gas into three levels: large, medium and small. The detection device 6 detects the intake volume and sends it to the control device 5. The control device 5 determines which level of the three levels the intake volume is in. The small level is only connected to one spray device 3, the medium level is connected to two, and the large level is connected to all the spray devices 3, thereby realizing graded spraying and achieving the effect of automatically adjusting the spray volume.

[0053] On the basis of the above embodiment, a packing layer 19 is further installed in the spray tower 1. The number of the packing layers 19 is the same as that of the spray devices 3, and they correspond one to one. The packing layers 19 are located below the corresponding spray devices 3. In this way, the packing layer 19 can slow down the rising speed of the exhaust gas, so that the exhaust gas can fully react with the spray device 3 in the packing layer 19. In this embodiment, the packing layer 19 uses an existing ceramic step ring packing.

[0054] In one embodiment of the circulation pump 4, the circulation pump 4 is a variable frequency pump. In this embodiment, the circulation pump 4 uses an existing electric variable frequency pump. In this way, the control device 5 can control the frequency of the circulation pump 4 according to the intake volume of the exhaust gas, thereby controlling the power of the circulation pump 4 to transport the spray liquid, so as to achieve the effect of automatically adjusting the spray volume and saving the energy consumption of the circulation pump 4.

[0055] In one embodiment of the control device 5, the control device 5 uses an existing DCS control system, the liquid inlet valve 15, the switch valve 41 and the discharge valve 81 all use existing electric regulating valves, the input end of the control device 5 is electrically connected to the detection device 6, the weighing device 2, and the PH monitoring device 7, and the output end of the control device 5 is electrically connected to the liquid inlet valve 15, the circulation pump 4, the switch valve 41, the discharge valve 81, and the discharge pump 8. In this way, the equipment for spraying waste gas treatment can automatically control the entire process of waste gas treatment through the control device 5, including automatic input of spray liquid, automatic adjustment of spray volume, automatic output of waste liquid, etc., without manual operation, and the working efficiency is higher than that of traditional waste gas treatment equipment, and it can ensure that the waste gas treatment effect is stable and reliable, and is suitable for unattended operation.

[0056] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for spraying waste gas, characterized in that: include: A spray tower, wherein the spray tower is provided with a detection device for detecting the air intake amount; A spray device, disposed in the spray tower, for spraying spray liquid into the spray tower; A circulation pump, connected between the spray tower and the spray device, for circulating the spray liquid in the spray tower to the spray device; The control device is electrically connected to the detection device and the circulation pump, and controls the power of the circulation pump to deliver the spray liquid so that the spraying amount of the spray liquid is proportional to the air intake amount.

2. The device for spraying waste gas according to claim 1, characterized in that: It also includes a pH monitoring device, which is arranged in the spray tower and is used to detect the pH value of the spray liquid in the spray tower. The spray tower is provided with a discharge port, and the discharge port is provided with a discharge valve, and the discharge valve is used to control the opening and closing of the discharge port; Wherein, the control device is also electrically connected to the PH monitoring device and the discharge valve. When the PH value obtained by the PH monitoring device reaches a preset range, the control device controls the discharge valve to open.

3. The device for spraying waste gas according to claim 1 or 2, characterized in that: The spray tower is provided with a liquid inlet for inputting spray liquid, the liquid inlet is connected to a water inlet pipe and a liquid alkali input pipe, both the water inlet pipe and the liquid alkali input pipe are provided with a liquid inlet valve, the control device is also electrically connected to the liquid inlet valve, and controls the opening and closing of the liquid inlet valve.

4. The device for spraying waste gas according to claim 3, characterized in that: It also includes a weighing device, which is arranged in the spray tower and is used to measure the weight of the spray liquid input into the liquid inlet. The control device is also electrically connected to the weighing device and controls the opening and closing of the weighing device.

5. The device for spraying waste gas according to claim 2, characterized in that: It also includes a discharge pump, the discharge port is connected to the liquid inlet end of the discharge pump, and the control device is also electrically connected to the discharge pump to control the opening and closing of the discharge pump.

6. The device for spraying waste gas according to claim 1, characterized in that: The liquid outlet end of the circulation pump is connected to a circulation liquid outlet main pipe, and a check valve is provided on the circulation liquid outlet main pipe. The check valve is used to limit the flow of the spray liquid toward the spray device.

7. The device for spraying waste gas according to claim 1, characterized in that: The liquid outlet end of the circulation pump is connected to a circulation liquid outlet main pipe, and a plurality of circulation liquid outlet branch pipes are connected in parallel to the output end of the circulation liquid outlet main pipe. The number of the circulation liquid outlet branch pipes is the same as the number of the spray devices, and they are connected one by one. The spray devices are arranged at intervals along the vertical direction of the spray tower. A switch valve is provided at the input end of the circulation liquid outlet branch pipe. The control device is also electrically connected to the switch valve, and controls the connection or cutoff of the circulation pump with the corresponding spray device.

8. The device for spraying waste gas according to claim 7, characterized in that: A packing layer is also provided in the spray tower. The number of the packing layers is the same as that of the spray devices and they correspond one to one. The packing layers are provided below the corresponding spray devices.

9. The device for spraying waste gas according to claim 1, characterized in that: The circulating pump is a variable frequency pump.

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