A multi-stage linkage gas-liquid reciprocating waste gas treatment device and a waste gas treatment method

Abstract

The present invention relates to the field of waste gas treatment, and specifically relates to a multi-stage linkage gas-liquid reciprocal waste gas treatment device and a waste gas treatment method. The waste gas to be treated enters the interior of the device from the air inlet of the mixing injector in the jet absorption device, and after being absorbed by the jet absorption device and each stage of spray absorption tower in sequence, it is discharged from the air outlet cylinder of the last stage of spray absorption tower; the absorption liquid enters the interior of the device from the liquid inlet of the last stage of spray absorption tower, and enters each stage of spray absorption tower and jet absorption device in sequence along the direction opposite to the waste gas flow direction, and finally is discharged from the second liquid outlet of the jet absorption device. The waste gas flows from front to back, and the absorption liquid advances from back to front. The waste gas and the absorption liquid are in countercurrent contact, which can maximize the absorption capacity of the absorption liquid for harmful substances in the waste gas, effectively maintain the absorption effect of each absorption device, prevent insufficient absorption of harmful gases caused by the gradual weakening of the absorption capacity, and finally achieve the effect of zero emission or extremely close to zero emission.

Description

Technical Field

[0001] The present invention relates to the field of waste gas treatment, and particularly to a multi-stage linked gas-liquid reciprocal waste gas treatment device and a waste gas treatment method. Background Art

[0002] In the existing industrial production system for electrolyzing metal chloride solutions, chlorine gas is generated during the electrolysis process by releasing chloride ions. As a toxic and harmful substance, chlorine gas must be harmlessly treated.

[0003] Currently in the industry, a two-stage absorption (a few use three stages) method is generally used to remove waste gas and then discharge it. In the absorption process, the waste gas that cannot be absorbed by the upper stage is continuously absorbed by the lower stage and finally discharged into the atmosphere. In the existing absorption devices, the absorption of each stage is not interconnected, and the absorption capacity of each stage weakens due to the absorption solution approaching saturation. In the prior art, when replacing the absorption liquid, usually the original absorption liquid is first transferred out, and then the new absorption liquid is transferred in. During actual operation, there is a time interval, and there is a gap period in the absorption tank. However, due to the requirements of the process and safe and stable production, the production system cannot be stopped or reduced in production at will because of updating the absorption liquid. Electrolytic production usually requires continuous operation for several days in a cycle, and the chlorine gas generated by electrolysis will be continuously and stably transported to the waste gas treatment device, and will not decrease because of the weakening of the treatment capacity of the absorption device. Therefore, during the operation of replacing the absorption liquid, waste gas will be continuously released, resulting in the waste gas not being absorbed during the gap period of replacing the absorption liquid and directly entering the next-stage absorption. Usually, the absorption capacity of the next stage is relatively small, making it difficult to ensure that all the absorbed waste gas is treated, and ultimately may lead to excessive emissions at the end. At this time, if the absorption liquid in the subsequent one or two-stage absorption devices has also been almost completely absorbed, the risk of direct discharge of waste gas into the atmosphere is extremely high. Similar situations also exist in other chemical reaction processes that require stable production and generate waste gas. Therefore, in actual industrial production, there are often phenomena of excessive chlorine emissions at the discharge port of the chlorine waste gas treatment device. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the present invention provides a multi-stage linked gas-liquid reciprocal waste gas treatment device and a waste gas treatment method, which specifically include the following contents:

[0005] A multi-stage linked gas-liquid reciprocal waste gas treatment device, comprising at least one set of jet absorption device and at least two-stage spray absorption towers. The jet absorption device includes a mixing ejector and an absorption liquid tank. The absorption liquid tank is provided with a first liquid outlet, a second liquid outlet, a first liquid inlet, a second liquid inlet and a gas outlet. The mixing ejector is provided with a liquid inlet, a liquid outlet and a gas inlet. The liquid inlet of the mixing ejector and the first liquid outlet of the absorption liquid tank, and between the liquid outlet of the mixing ejector and the first liquid inlet of the absorption liquid tank are respectively connected through a first pipeline and a second pipeline; The spray absorption tower is provided with a liquid inlet, a liquid outlet, a gas inlet and a gas outlet. The gas inlet of the spray absorption tower is connected to the gas outlet of the absorption liquid tank, and the liquid outlet of the spray absorption tower and the liquid inlet of the absorption liquid tank are connected through a third pipeline; Between the liquid inlet of the spray absorption tower and the liquid outlet of the next-stage spray absorption tower, and between the gas outlet of the spray absorption tower and the gas inlet of the next-stage spray absorption tower are respectively connected through a fourth pipeline and a fifth pipeline; The liquid inlet of the last-stage spray absorption tower is connected to an external absorption liquid system through a liquid inlet pipeline, and an exhaust chimney is provided at the gas outlet of the last-stage spray absorption tower.

[0006] Specifically, it includes at least two sets of jet absorption devices. The absorption liquid tanks of each set of jet absorption devices are connected through a communication pipeline, and a communication valve is provided on the communication pipeline.

[0007] Specifically, the spray absorption tower includes a spray part and an absorption liquid tank arranged at the bottom of the spray part and communicating with the spray part. The lower end of the spray part is provided with a gas inlet, and the upper end of the spray part is provided with a gas outlet and a spray liquid inlet; The absorption liquid tank is provided with a liquid inlet, a liquid outlet and a spray liquid outlet. Between the spray liquid outlet and the spray liquid inlet are connected through a spray liquid pipeline, and a spray liquid flowmeter is provided on the spray liquid pipeline.

[0008] Specifically, a gas balance box is also provided between the jet absorption device and the connected spray absorption tower. The gas balance box is provided with a gas inlet and a gas outlet. Between the gas inlet of the gas balance box and the gas outlet of the absorption liquid tank of the jet absorption device, and between the gas outlet of the gas balance box and the gas inlet of the spray absorption tower are respectively connected through a sixth pipeline and a seventh pipeline. Condensate may be generated in the gas balance box, and a drain valve and a pipeline can be additionally provided for drainage, leading to the absorption circulation tank or the absorption tower circulation tank.

[0009] Specifically, the second liquid outlet of the absorption liquid tank is connected to the liquid outlet pipeline, and a liquid outlet valve and a liquid outlet pump are arranged on the liquid outlet pipeline; a liquid inlet valve is arranged on the liquid inlet pipeline of the last-stage spray absorption tower; the absorption liquid tank of the jet absorption device is provided with a first pH meter, a first liquid level meter, a first thermometer and a first pressure gauge; the spray absorption tower is provided with a second pH meter, a second liquid level meter and a second thermometer; a first valve and a first liquid pump are arranged on the first pipeline; a third valve and a third liquid pump are arranged on the third pipeline; a fourth valve and a fourth liquid pump are arranged on the fourth pipeline; a first induced draft fan is arranged on the seventh pipeline; a second induced draft fan is arranged on the fifth pipeline.

[0010] Specifically, the absorption liquid tank is further provided with a third liquid inlet, and the jet absorption device further includes a heat exchanger. The feed inlet of the heat exchanger is connected to the liquid outlet pipeline at the second liquid outlet of the absorption liquid tank, and the discharge outlet of the heat exchanger is connected to the third liquid inlet of the absorption liquid tank through an eighth pipeline, and an eighth valve is arranged on the eighth pipeline; the discharge outlet of the heat exchanger is also communicated with an external sodium hypochlorite storage tank through a ninth pipeline, and a ninth valve is arranged on the ninth pipeline.

[0011] Specifically, it further includes an automatic control system. The automatic control system includes a calculation device, and a signal receiving device and a control device respectively connected to the calculation device; the signal receiving device is respectively connected to the first pH meter, the first liquid level meter, the first thermometer, the first pressure gauge, the second pH meter, the second liquid level meter, the second thermometer, the first valve, the first liquid pump, the third valve, the third liquid pump, the fourth valve, the fourth liquid pump, the first induced draft fan, the second induced draft fan, and the liquid inlet valve by signal; the control device is respectively connected to the first valve, the third valve, the fourth valve and the liquid inlet valve.

[0012] A method for treating waste gas by using the multi-stage linkage gas-liquid reciprocating waste gas treatment device disclosed by the present invention. The waste gas to be treated enters the device from the air inlet of the mixing injector in the jet absorption device, and after being absorbed by the jet absorption device and each stage of spray absorption tower in sequence, it is discharged from the air outlet cylinder of the last-stage spray absorption tower; the absorption liquid enters the device from the liquid inlet of the last-stage spray absorption tower, and sequentially enters each stage of spray absorption tower and jet absorption device in the direction opposite to the waste gas flow direction, and finally is discharged from the second liquid outlet of the jet absorption device.

[0013] Specifically, the amount of the absorption liquid in the absorption liquid tank of the jet absorption device is 70%-75% of the capacity of the absorption liquid tank; the spray absorption tower includes an absorption liquid tank, and the amount of the absorption liquid in the absorption liquid tank is 80%-85% of the capacity of the absorption liquid tank.

[0014] An application of the waste gas treatment method disclosed by the present invention in the treatment of chlorine-containing waste gas, and the absorption liquid is a sodium hydroxide solution.

[0015] Advantages of the present invention:

[0016] (1) The waste gas absorption device disclosed in the present invention includes at least one set of jet absorption devices. Each jet absorption device includes a mixing injector and an absorption liquid tank. The waste gas first contacts the absorption liquid in the mixing injector, and then enters the absorption liquid tank together with the absorption liquid through the connecting pipe between the mixing injector and the absorption liquid tank. During this process, the waste gas contacts the absorption liquid again. In addition, the two continue to mix and contact in the absorption liquid tank, which can ensure to the greatest extent that the absorption liquid fully absorbs the waste gas.

[0017] (2) The waste gas absorption device disclosed in the present invention is provided with multiple sets of parallel jet absorption devices. On the one hand, it can realize the synchronous absorption of harmful gases from multiple sources; on the other hand, when one set of jet absorption devices needs to be repaired or fails, other jet absorption devices can be used for waste gas absorption, which can ensure the continuous and uninterrupted waste gas treatment.

[0018] (3) At least two-stage spray absorption towers are arranged after the jet absorption device. The spray absorption towers play a role in supplementing the absorption of the waste gas, which can prevent the emission of harmful gases that are not fully absorbed.

[0019] (4) An automatic control device is provided in the waste gas absorption device disclosed in the present invention. The automatic control device is connected to each detection device on each jet absorption device and spray absorption tower, as well as valves, pumps, fans, etc. on each pipeline, which can realize the real-time transmission of detection signals and control signals, monitor the operation of the device in real time, and realize the automatic control of the entire device.

[0020] (5) In the waste gas treatment method disclosed in the present invention, from the jet absorption device to each stage of spray absorption tower, the waste gas flows from front to back, and the absorption liquid advances from back to front. The waste gas and the absorption liquid are in countercurrent contact, which can maximize the absorption capacity of the absorption liquid for harmful substances in the waste gas. Moreover, the absorption liquid in each absorption device can be updated in time, which can effectively maintain the absorption effect of each absorption device, prevent the insufficient absorption of harmful gases caused by the gradual weakening of the absorption capacity, and finally achieve the effect of zero emission or extremely close to zero emission. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of a multi-stage linkage gas-liquid countercurrent waste gas treatment device disclosed in the present invention. Detailed Embodiments

[0022] The present invention will be described in detail below with reference to the drawings and specific embodiments. The following embodiments do not limit the content of the invention recorded in the claims in any way. In addition, all the contents shown in the following embodiments are not limited to those necessary for the solution of the invention recorded in the claims.

[0023] Reference appendix Figure 1 In the figure, the arrows indicate the flow direction of gas or liquid. A multi-stage linked gas-liquid reciprocal waste gas treatment device includes at least one set of jet absorption device and at least two-stage spray absorption towers 10. The jet absorption device includes a mixing ejector 11 and an absorption liquid tank 12. The absorption liquid tank 12 is provided with a first liquid outlet, a second liquid outlet, a first liquid inlet, a second liquid inlet and a gas outlet. The mixing ejector 11 is provided with a liquid inlet, a liquid outlet and a gas inlet. The liquid inlet of the mixing ejector 11 and the first liquid outlet of the absorption liquid tank 12, and the liquid outlet of the mixing ejector 11 and the first liquid inlet of the absorption liquid tank 12 are respectively connected by a first pipeline 1 and a second pipeline 2. The spray absorption tower 10 is provided with a liquid inlet, a liquid outlet, a gas inlet and a gas outlet. The gas inlet of the spray absorption tower 10 is connected to the gas outlet of the absorption liquid tank 12, and the liquid outlet of the spray absorption tower 10 and the liquid inlet of the absorption liquid tank 12 are connected by a third pipeline 3. The liquid inlet of the spray absorption tower 10 and the liquid outlet of the next-stage spray absorption tower 101, and the gas outlet of the spray absorption tower 10 and the gas inlet of the next-stage spray absorption tower 101 are respectively connected by a fourth pipeline 4 and a fifth pipeline 5. The liquid inlet of the last-stage spray absorption tower 101 is connected to an external absorption liquid system through a liquid inlet pipeline, and the gas outlet of the last-stage spray absorption tower 101 is provided with an exhaust stack 13, and the height of the exhaust stack 13 is not less than 25 meters. The jet absorption device includes a mixing ejector 11 and an absorption liquid tank 12. The waste gas D first enters the mixing ejector 11 through a pipeline, contacts the absorption liquid in the mixing ejector 11, and then enters the absorption liquid tank 12 together with the absorption liquid through the connecting pipeline between the mixing ejector 11 and the absorption liquid tank 12. During this process, the waste gas contacts the absorption liquid again. In addition, the two continue to contact in the absorption liquid tank 12, which can ensure to the greatest extent that the absorption liquid fully absorbs the waste gas. At least two-stage spray absorption towers 10 are arranged after the jet absorption device, and the spray absorption towers 10 play a role in supplementary absorption of the waste gas, which can prevent the emission of harmful gases that are not fully absorbed.

[0024] In an embodiment of the present invention, the device includes at least two sets of jet absorption devices, and the absorption liquid tanks 12 of each set of jet absorption devices are connected by a communication pipeline, and a communication valve is arranged on the communication pipeline. Multiple sets of parallel jet absorption devices can, on the one hand, realize the synchronous absorption of harmful gases from multiple sources; on the other hand, when one set of jet absorption device is under maintenance or fails, other jet absorption devices can be used for waste gas absorption, which can ensure the continuous and uninterrupted waste gas treatment.

[0025] In an embodiment of the present invention, the spray absorption tower 10 includes a spray section and an absorption liquid tank disposed at the bottom of the spray section and communicating with the spray section. An air inlet is provided at the lower end of the spray section, and an air outlet and a spray liquid inlet are provided at the upper end of the spray section. The absorption liquid tank is provided with a liquid inlet, a liquid outlet, and a spray liquid outlet. The spray liquid outlet and the spray liquid inlet are connected through a spray liquid pipeline, and a spray liquid flowmeter is provided on the spray liquid pipeline.

[0026] In an embodiment of the present invention, a gas balance tank is further provided between the jet absorption device and the connected spray absorption tower 10. The gas balance tank is provided with an air inlet and an air outlet. The air inlet of the gas balance tank and the air outlet of the absorption liquid tank 12 of the jet absorption device, and the air outlet of the gas balance tank and the air inlet of the spray absorption tower 10 are respectively connected through a sixth pipeline and a seventh pipeline. Condensate may be generated in the gas balance tank, and a drain valve and a pipeline may be additionally provided for drainage, leading to the absorption circulation tank or the absorption tower circulation tank. The gas balance tank can play a role in gas storage and buffering.

[0027] In an embodiment of the present invention, the second liquid outlet of the absorption liquid tank 12 is connected to a liquid outlet pipeline, and a liquid outlet valve and a liquid outlet pump are provided on the liquid outlet pipeline. A liquid inlet valve is provided on the liquid inlet pipeline of the last-stage spray absorption tower 101. The absorption liquid tank 12 of the jet absorption device is provided with a first pH meter, a first liquid level meter, a first thermometer, and a first pressure gauge. The spray absorption tower 10 is provided with a second pH meter, a second liquid level meter, and a second thermometer. A first valve and a first liquid pump are provided on the first pipeline 1. A third valve and a third liquid pump are provided on the third pipeline 3. A fourth valve and a fourth liquid pump are provided on the fourth pipeline 4. A first induced draft fan 14 is provided on the seventh pipeline. A second induced draft fan 15 is provided on the fifth pipeline 5. The pH meter, liquid level meter, thermometer, pressure gauge, etc. in this device can real-time monitor the pH, liquid level, temperature, pressure, etc. inside the absorption liquid tank 12 or the spray absorption tower 10, making the entire process safer and more reliable. The fans or pumps on each pipeline of this device can provide power for the flow of waste gas or absorption liquid, and each valve can control the circulation and closure of the absorption liquid or waste gas.

[0028] In an embodiment of the present invention, the absorption liquid tank 12 is further provided with a third liquid inlet. The jet absorption device further includes a heat exchanger. The feed inlet of the heat exchanger is connected to the liquid outlet pipeline at the second liquid outlet of the absorption liquid tank 12. The discharge outlet of the heat exchanger is connected to the third liquid inlet of the absorption liquid tank 12 through an eighth pipeline, and an eighth valve is provided on the eighth pipeline 8. The discharge outlet of the heat exchanger is also communicated with an external sodium hypochlorite storage tank through a ninth pipeline, and a ninth valve is provided on the ninth pipeline 9. By controlling the eighth valve and the ninth valve, a loop can be formed between the heat exchanger and the absorption liquid tank 12. Thus, the heat exchanger can control the temperature of the absorption liquid in the absorption liquid tank 12, ensure that the absorption liquid maintains the best absorption state, and prevent the absorbed waste gas from being released due to the too high or too low temperature of the absorption liquid. In addition, the heat exchanger can also control the temperature of the absorption liquid finally discharged from the absorption liquid tank 12, preventing the absorbed waste gas from being released due to the too high or too low temperature of the absorption liquid.

[0029] In an embodiment of the present invention, an automatic control system is further included. The automatic control system includes a computing device, and a signal receiving device and a control device respectively connected to the computing device. The signal receiving device is respectively connected to the first pH meter, the first liquid level meter, the first thermometer, the first pressure gauge, the second pH meter, the second liquid level meter, the second thermometer, the first valve, the first liquid pump, the third valve, the third liquid pump, the fourth valve, the fourth liquid pump, the first induced draft fan 14, the second induced draft fan 15, and the liquid inlet valve by signal. The control device is respectively connected to the first valve, the third valve, the fourth valve, and the liquid inlet valve. The automatic control device is connected to each detection device on the jet absorption device and the spray absorption tower 10, as well as valves, pumps, fans, etc. on each pipeline, which can realize the real-time transmission of detection signals and control signals, monitor the operation of the device in real time, and realize the automatic control of the entire device. The specific control method is as follows: The signal receiving device of the automatic control device receives signals from the first pH meter, the first liquid level meter, the first thermometer, the first pressure gauge, the second pH meter, the second liquid level meter, the second thermometer, the first valve, the first liquid pump, the third valve, the third liquid pump, the fourth valve, the fourth liquid pump, the first induced draft fan 14, the second induced draft fan, and the liquid inlet valve, and then the signal receiving device transmits the signals to the computing device. The computing device calculates according to each detection signal and the pre-set process parameters, obtains a calculation result, and transmits the calculation result to the connected control device. The control device sends control signals to the first valve, the first liquid pump, the third valve, the third liquid pump, the fourth valve, the fourth liquid pump, the first induced draft fan 14, the second induced draft fan 15, or the liquid inlet valve according to the calculation result, controls the working states of each valve, pump, and fan, and further realizes the automatic control of the entire device.

[0030] In an embodiment of the present invention, the eighth valve and the ninth valve can also be connected to the automatic control device.

[0031] A method for treating waste gas by using the multi-stage linked gas-liquid reciprocal waste gas treatment device disclosed in the present invention. The waste gas D to be treated enters the device through the air inlet of the mixing injector 11 in the jet absorption device, and after being absorbed by the jet absorption device and each stage of spray absorption tower 10 in sequence, it is discharged from the air outlet cylinder of the last stage of spray absorption tower 101; the absorption liquid enters the device through the liquid inlet of the last stage of spray absorption tower 101, and enters each stage of spray absorption tower 10 and the jet absorption device in sequence along the direction opposite to the waste gas flow direction, and finally is discharged from the second liquid outlet of the jet absorption device. The waste gas flows from front to back, and the absorption liquid advances from back to front. The waste gas and the absorption liquid are in countercurrent contact, which can maximize the absorption capacity of the absorption liquid for harmful substances in the waste gas. Moreover, the absorption liquid in each absorption device can be updated in time, which can effectively maintain the absorption effect of each absorption device and prevent insufficient absorption of harmful gases caused by the gradual weakening of the absorption capacity. Finally, the effect of zero emission or approaching zero emission is achieved.

[0032] In an embodiment of the present invention, the amount of the absorption liquid in the absorption liquid tank 12 of the jet absorption device is 70%-75% of the capacity of the absorption liquid tank 12; the amount of the absorption liquid in the spray absorption tower 10 is 80%-85% of the capacity of the absorption liquid tank of the spray absorption tower 10.

[0033] In the waste gas treatment method disclosed in the present invention, the running route of the absorption liquid is to enter the device from the last stage of spray absorption tower 101, then flow from back to front, and finally be discharged from the second liquid outlet of the absorption liquid tank 12. Taking the whole device including three-stage absorption devices (the first-stage absorption device A is a jet absorption device, and the second-stage absorption device B and the third-stage absorption device C are spray absorption towers) as an example, the specific flow method of the absorption liquid is as follows:

[0034] (1) When the whole device is used for the first time, the absorption liquid in each stage of spray absorption tower 10 and each absorption liquid tank 12 is added to the appropriate position.

[0035] (2) When the first-stage absorption device needs to be replenished with liquid, the absorption liquid of the second-stage absorption device is transported to the absorption liquid tank 12 of the first-stage absorption device until the specified liquid level;

[0036] (3) When the second-stage absorption device needs to be replenished with liquid, the absorption liquid of the third-stage absorption device is transported to the second-stage absorption device until the specified liquid level;

[0037] (4) When the third-stage absorption device needs to be replenished with liquid, the prepared absorption liquid is added from the liquid inlet until the specified liquid level;

[0038] (5) The waste gas treatment is carried out as described above. When the product of the absorption reaction in the solution in the absorption liquid tank 12 of the primary absorption device reaches a specified concentration, it is the by-product finished solution. This solution is output from the second liquid outlet of the absorption liquid tank 12 and transported through a pipeline to the by-product finished product tank for storage.

[0039] The waste gas treatment method disclosed in the present invention can be used to treat chlorine-containing waste gas. When treating chlorine-containing waste gas, the absorption liquid used is sodium hydroxide solution. The method for preparing the absorption solution is as follows: Purchase an ion-exchange membrane sodium hydroxide solution with a content of 32% on the market, match deionized water in a volume ratio of 1:2, and stir evenly to obtain the required absorption liquid. The absorption principle is: Cl2 + 2NaOH = NaCl + NaClO + H2O.

[0040] When the device disclosed in the present invention is applied, the absorption liquid tank 12 of the primary absorption device (spray absorption device) has a relatively large capacity, while the absorption liquid tank of the absorption tower has a relatively small capacity. Therefore, the transfer and retention of the absorption liquid in each stage of the absorption liquid tank are slightly different as follows: 2 / 3 of the absorption liquid in the absorption liquid tank 12 is transferred out and 1 / 3 is retained at the bottom, and then transferred to the external sodium hypochlorite storage tank; for the second and third stage spray absorption towers 10, 1 / 2 is transferred out and 1 / 2 is retained at the bottom, and they are transferred to the first and second stages in sequence; the absorption liquid in the third stage comes from the absorption liquid prepared in the external absorption liquid system.

[0041] The finally discharged absorption liquid is sodium hypochlorite solution (by-product), and its quality complies with the GB 19106-2013 standard, and it can be used for disinfection, sterilization, water treatment and other purposes. Specifically, it can be adjusted according to the actual needs of the factory. The waste gas treatment device and method disclosed in the present invention have been verified by application, and it can achieve that the chlorine detection data at the emission port is zero or not detected.

[0042] Unless otherwise clearly specified and limited, the terms "set" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0043] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-stage linkage gas-liquid reciprocal waste gas treatment device, characterized in that, Comprising at least one set of jet absorption device and at least two-stage spray absorption tower, the jet absorption device includes a mixing injector and an absorption liquid tank. The absorption liquid tank is provided with a first liquid outlet, a second liquid outlet, a first liquid inlet, a second liquid inlet and an air outlet. The mixing injector is provided with a liquid inlet, a liquid outlet and an air inlet. Between the liquid inlet of the mixing injector and the first liquid outlet of the absorption liquid tank, and between the liquid outlet of the mixing injector and the first liquid inlet of the absorption liquid tank, they are respectively connected by a first pipeline and a second pipeline; the spray absorption tower is provided with a liquid inlet, a liquid outlet, an air inlet and an air outlet. The air inlet of the spray absorption tower is connected to the air outlet of the absorption liquid tank, and the liquid outlet of the spray absorption tower is connected to the second liquid inlet of the absorption liquid tank through a third pipeline; between the liquid inlet of the spray absorption tower and the liquid outlet of the next-stage spray absorption tower, and between the air outlet of the spray absorption tower and the air inlet of the next-stage spray absorption tower, they are respectively connected by a fourth pipeline and a fifth pipeline; the liquid inlet of the last-stage spray absorption tower is connected to an external absorption liquid system through a liquid inlet pipeline, and an exhaust stack is provided at the air outlet of the last-stage spray absorption tower; Comprising at least two sets of jet absorption devices, the absorption liquid tanks of each set of jet absorption devices are connected by a communication pipeline, and a communication valve is provided on the communication pipeline; A gas balance box is also provided between the jet absorption device and the connected spray absorption tower. The gas balance box is provided with an air inlet and an air outlet. Between the air inlet of the gas balance box and the air outlet of the absorption liquid tank of the jet absorption device, and between the air outlet of the gas balance box and the air inlet of the spray absorption tower, they are respectively connected by a sixth pipeline and a seventh pipeline; the second liquid outlet of the absorption liquid tank is connected to a liquid outlet pipeline, and a liquid outlet valve and a liquid outlet pump are provided on the liquid outlet pipeline; A liquid inlet valve is provided on the liquid inlet pipeline of the last-stage spray absorption tower; The absorption liquid tank of the jet absorption device is provided with a first pH meter, a first liquid level meter, a first thermometer and a first pressure gauge; The spray absorption tower is provided with a second pH meter, a second liquid level meter and a second thermometer; A first valve and a first liquid pump are provided on the first pipeline; A third valve and a third liquid pump are provided on the third pipeline; A fourth valve and a fourth liquid pump are provided on the fourth pipeline; A first induced draft fan is provided on the seventh pipeline; A second fan is provided on the fifth pipeline; The absorption liquid tank is also provided with a third liquid inlet, and the jet absorption device also includes a heat exchanger. The feed inlet of the heat exchanger is connected to the liquid outlet pipeline at the second liquid outlet of the absorption liquid tank, and the discharge outlet of the heat exchanger is connected to the third liquid inlet of the absorption liquid tank through an eighth pipeline, and an eighth valve is provided on the eighth pipeline; The discharge outlet of the heat exchanger is also communicated with an external sodium hypochlorite storage tank through a ninth pipeline, and a ninth valve is provided on the ninth pipeline.

2. The multi-stage linkage gas-liquid reciprocating waste gas treatment device according to claim 1, wherein, The spray absorption tower includes a spray section and an absorption liquid tank arranged at the bottom of the spray section and communicating with the spray section. An air inlet is provided at the lower end of the spray section, and an air outlet and a spray liquid inlet are provided at the upper end of the spray section. The absorption liquid tank is provided with a liquid inlet, a liquid outlet, and a spray liquid outlet. The spray liquid outlet and the spray liquid inlet are connected by a spray liquid pipeline, and a spray liquid flowmeter is arranged on the spray liquid pipeline.

3. The multi-stage linkage gas-liquid reciprocating waste gas treatment device according to claim 1, characterized in that, It further includes an automatic control system, and the automatic control system includes a calculation device, and a signal receiving device and a control device respectively connected to the calculation device. The signal receiving device is respectively connected to the first pH meter, the first liquid level meter, the first thermometer, the first pressure gauge, the second pH meter, the second liquid level meter, the second thermometer, the first valve, the first liquid pump, the third valve, the third liquid pump, the fourth valve, the fourth liquid pump, the first induced draft fan, the second induced draft fan, and the liquid inlet valve by signal. The control device is respectively connected to the first valve, the third valve, the fourth valve, and the liquid inlet valve.

4. A method for treating waste gas by using the multi-stage linkage gas-liquid reciprocating waste gas treatment device according to any one of claims 1 to 3, characterized in that, The waste gas to be treated enters the device through the air inlet of the mixing injector in the jet absorption device, and after being absorbed by the jet absorption device and each stage of spray absorption tower in sequence, it is discharged from the air outlet cylinder of the last stage of spray absorption tower. The absorption liquid enters the device through the liquid inlet of the last stage of spray absorption tower, and enters each stage of spray absorption tower and jet absorption device in sequence along the direction opposite to the waste gas flow direction, and finally is discharged from the second liquid outlet of the jet absorption device.

5. The waste gas treatment method according to claim 4, characterized in that, The amount of the absorption liquid in the absorption liquid tank of the jet absorption device is 70%-75% of the capacity of the absorption liquid tank. The spray absorption tower includes an absorption liquid tank, and the amount of the absorption liquid in the absorption liquid tank is 80%-85% of the capacity of the absorption liquid tank.

6. Use of the waste gas treatment method according to claim 4 in the treatment of chlorine-containing waste gas, characterized in that, The absorption liquid is a sodium hydroxide solution.

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