Acid-alkali waste gas multi-stage circulation environment-friendly treatment device

Abstract

The utility model discloses a multistage circulating environment-friendly treatment device for acid-base waste gas, which relates to the technical field of environment-friendly treatment of waste gas and comprises a washing tower, a gas inlet is arranged on one side of the washing tower, a liquid box is arranged on one side opposite to the gas inlet, and a first gas outlet pipe is fixedly connected to the top of the washing tower. An activated carbon adsorption box is arranged on one side of the tail end of the first air outlet pipe and is matched and connected with the first air outlet pipe; a second air outlet pipe is fixedly connected to the top of the activated carbon adsorption box, a centrifugal fan is connected to the tail end of the second air outlet pipe in a matched mode, and an exhaust pipe is arranged on one side of the centrifugal fan; waste gas treated by the washing tower enters the activated carbon adsorption box, the granular activated carbon layer can effectively adsorb residual organic pollutants, a trace amount of acid-base gas which is not completely treated and peculiar smell substances, the gas is further purified, and the treated waste gas can reach a higher emission standard through the cooperation of multi-stage treatment, so that the waste gas treatment efficiency is improved. The pollution to the environment is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to waste gas environmental protection treatment technical field, specifically is a kind of acid-base waste gas multistage circulation environmental protection treatment device. BACKGROUND

[0002] With the rapid development of modern industry, numerous chemical industry, electroplating, pharmaceutical, printing and dyeing etc. in production process emit a large amount of acid-base waste gas. These acid-base waste gas not only contains hydrochloric acid, sulfuric acid, nitric acid and other acid gases, but also contains ammonia and other alkaline gas components. If they are directly discharged into the atmosphere without effective treatment, they will cause extremely serious harm to the environment and human health.

[0003] Traditional acid-base waste gas treatment method has many limitations. Although single acid-base neutralization method can treat waste gas to some extent, it is difficult to meet the increasingly stringent environmental emission standards for complex composition and large concentration fluctuation of waste gas. If adsorption method is used alone, the adsorbent is easy to saturate, and frequent replacement or regeneration is required, which has high cost and limited treatment efficiency. Simple spray washing method can only remove part of acid or alkaline substances in waste gas, and has weak removal capacity for some insoluble or volatile pollutants, and may produce a large amount of wastewater, which may cause secondary pollution if not properly treated. UTILITY MODEL CONTENT

[0004] The utility model aims at providing an acid-base waste gas multistage circulation environmental protection treatment device, which utilizes the synergistic effect of different material packing layers in the washing tower and spray liquid to make the acid-base components in the waste gas fully contact with the spray liquid and react or be absorbed, so as to remove most of the acid-base substances. Then, the granular activated carbon layer in the activated carbon adsorption tank is used to further adsorb the residual organic pollutants, trace untreated acid-base gases and odor substances in the waste gas, so that the treated waste gas can meet the strict environmental emission standards, effectively reduce the pollution of atmospheric environment, and protect the ecological balance and human health. Thus, the technical problems in the above background technology are solved.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] An acid-base waste gas multistage circulation environmental protection treatment device includes a washing tower, one side of the washing tower is provided with an air inlet, the opposite side of the air inlet is provided with a liquid tank, the top of the washing tower is fixedly connected with a first gas outlet pipe, the tail end of the first gas outlet pipe is provided with an activated carbon adsorption tank, and the activated carbon adsorption tank is connected with the first gas outlet pipe; the top of the activated carbon adsorption tank is fixedly connected with a second gas outlet pipe, the tail end of the second gas outlet pipe is connected with a centrifugal fan, and one side of the centrifugal fan is provided with an exhaust pipe.

[0007] As a further technical scheme of the utility model, the liquid tank is fixedly connected with a liquid pipe at one side of the bottom of the washing tower, and the other end of the liquid pipe extends to the inside bottom of the washing tower and is fixedly connected with the washing tower; the top of the liquid tank is fixedly connected with two liquid pumps, and each of the liquid pumps is installed with a liquid circulating pipe at one side; one end of the liquid circulating pipe is arranged inside the liquid tank, and the other end extends to the inside of the washing tower and is fixedly connected with the washing tower; a valve is connected with the liquid circulating pipe, and a pressure gauge is installed above the valve.

[0008] As a further technical scheme of the utility model, the centrifugal fan is provided with a base at the bottom, a motor is fixedly connected above the base, a pulley is installed at one end of the output shaft of the motor and at the same side of the centrifugal fan, and the pulley is connected with the centrifugal fan through a belt transmission; a pipeline assembly is installed at the air outlet of the centrifugal fan, and the other end of the pipeline assembly extends to the inside of the exhaust pipe.

[0009] As a further technical scheme of the utility model, the washing tower is provided with a liquid storage tank below the inside, the liquid pipe extends to the inside of the liquid storage tank, a plurality of spray holes are formed in the liquid circulating pipe inside the washing tower, a filler layer is arranged below each of the spray holes and is fixedly connected with the inner wall of the washing tower, and a gas-liquid separation device is arranged above the inside of the washing tower and is fixedly connected with the inner wall of the washing tower.

[0010] As a further technical scheme of the utility model, the filler layer inside the washing tower is made of ceramic Rasching ring filler, polypropylene Paul ring filler and metal wire mesh filler.

[0011] As a further technical scheme of the utility model, a liquid level monitoring sensor is arranged inside the liquid tank, and the liquid level monitoring sensor is in communication connection with an external control unit.

[0012] As a further technical scheme of the utility model, a fiber filter is arranged in the air inlet of the washing tower and is in connection with the inner wall of the air inlet.

[0013] As a further technical scheme of the utility model, a granular activated carbon layer is arranged in the activated carbon adsorption tank, and a maintenance door is arranged at one side of the activated carbon adsorption tank.

[0014] As a further technical scheme of the utility model, a ladder stand is fixedly connected with one side of the washing tower, and a plurality of maintenance openings are formed at the filler layer.

[0015] As a further technical scheme of the utility model, a protective cover is arranged outside the liquid pump and is fixedly connected with the top of the liquid tank.

[0016] As a further technical scheme of the utility model, a belt protective cover is arranged at the pulley belt of the pulley installed at one end of the output shaft of the motor.

[0017] Compared with the prior art, the utility model has the beneficial effects that:

[0018] 1. The utility model discloses, the spray hole on the liquid circulation pipe sprays the liquid provided by the liquid tank into night fog, and fully contacts with the acid-base waste gas from the air inlet, because the packing layer that adopts the combination of ceramic rasching ring packing, polypropylene bower ring packing and metal wire mesh packing greatly increases the gas-liquid contact area and mass transfer efficiency, so that the acidic or alkaline substances in the acid-base waste gas can rapidly neutralize with the spray liquid or be absorbed, and the waste gas after the treatment of the washing tower enters the activated carbon adsorption tank, the granular activated carbon layer can effectively adsorb the residual organic pollutants, trace untreated acid-base gas and odor substances, further purify the gas, through the cooperation of the multistage treatment, the treated waste gas can reach higher emission standard, and the pollution to the environment is reduced.

[0019] 2. The utility model discloses, the liquid level monitoring sensor in the liquid tank is connected with the external control unit, can real -time monitoring liquid level height, when the liquid level is abnormal, the control unit automatically starts corresponding liquid level supplement or discharge device, ensures that the liquid tank always has the liquid of proper amount to supply the spray system of washing tower, avoids the processing effect decline caused by the liquid shortage, also prevents the situation such as liquid too much overflow, guarantees the stability and continuity of the whole device operation, reduces the equipment failure and downtime caused by liquid level problem, improves the reliability and operability of the equipment.

[0020] 3. The utility model discloses, the liquid circulation system that the liquid tank and washing tower build, realizes the recycling of liquid through liquid pump and liquid circulation pipe, this not only reduces the consumption of liquid, reduces the processing cost, also reduces the discharge of waste liquid, meets the requirements of environmental protection and resource saving, simultaneously, the equipment structure design of reasonable and stable operation performance also reduces the equipment maintenance and replacement cost, from the long -term operation, has good economy, can save a large amount of funds and resources for enterprise in waste gas treatment aspect. ACCURACY

[0021] Figure 1 It is the three-dimensional structure schematic diagram of the utility model.

[0022] Figure 2 It is the front view of the utility model Figure 1 .

[0023] Figure 3 It is another perspective three-dimensional structure schematic diagram of the utility model Figure 1 .

[0024] Figure 4 It is the left view of the utility model Figure 1 .

[0025] Figure 5 is another perspective view of the utility model Figure 3 .

[0026] Figure 6 is a top view of the utility model Figure 1 .

[0027] In the figure: 1-washing tower, 2-liquid tank, 3-activated carbon adsorption tank, 4-centrifugal fan, 5-exhaust pipe;

[0028] 11-inlet, 12-crawling ladder, 13-first exhaust pipe;

[0029] 21-liquid circulation pipe, 22-valve, 23-pressure gauge, 24-protective cover, 25-liquid pump;

[0030] 31-access door, 32-second exhaust pipe;

[0031] 41-base, 42-motor, 43-belt protective cover, 44-pipeline assembly. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0033] Please refer to Figures 1-6 , in the embodiments of the utility model, including washing tower 1, the washing tower 1 one side is equipped with inlet 11, the opposite side of inlet 11 is equipped with liquid tank 2, the washing tower 1 top is fixedly connected with first exhaust pipe 13, and the tail end one side of first exhaust pipe 13 is equipped with activated carbon adsorption tank 3, and is connected with cooperation;The activated carbon adsorption tank 3 top is fixedly connected with second exhaust pipe 32, and the tail end of second exhaust pipe 32 is connected with centrifugal fan 4, and one side of centrifugal fan 4 is equipped with exhaust pipe 5.

[0034] By adopting the above technical scheme, the gas inlet 11 is used as the inlet of the acid and alkali waste gas into the treatment device, and is arranged at one side of the washing tower 1, so that the waste gas can orderly enter the subsequent treatment link. The liquid tank 2 arranged at the opposite side provides a source of liquid medium required for treating the waste gas for the washing tower 1. The first gas outlet pipe 13 at the top of the washing tower 1 guides the waste gas after preliminary treatment to the activated carbon adsorption tank 3. Through the adsorption of the activated carbon, the residual organic pollutants, trace amounts of acid and alkali gas and odor substances and the like in the waste gas are further purified. The second gas outlet pipe 32 at the top of the activated carbon adsorption tank 3 transmits the gas after re-purification to the centrifugal fan 4. The centrifugal fan 4 draws the purified gas out of the activated carbon adsorption tank 3 and discharges the gas to the atmospheric environment through the exhaust pipe 5 at one side of the centrifugal fan 4.

[0035] In the embodiment, the liquid tank 2 is fixedly connected with a liquid pipe 14 at one side of the bottom end of the washing tower 1. The other end of the liquid pipe 14 extends to the inside bottom of the washing tower 1 and is fixedly connected with the washing tower 1. Two liquid pumps 25 are fixedly connected at the top of the liquid tank 2. Liquid circulation pipes 21 are respectively arranged at one side of each of the liquid pumps 25. One end of each of the liquid circulation pipes 21 is arranged in the liquid tank 2, and the other end of each of the liquid circulation pipes 21 extends to the inside of the washing tower 1 and is fixedly connected with the washing tower 1. Valves 22 are connected with the liquid circulation pipes 21. Pressure gauges 23 are arranged above the valves 22.

[0036] By adopting the above technical scheme, the liquid tank 2 is connected with the inside bottom of the washing tower 1 through the liquid pipe 14 at one side of the bottom end. The gravity causes the liquid to naturally flow into the liquid tank 2. The two liquid pumps 25 at the top of the liquid tank 2 and the liquid circulation pipes 21 connected with the liquid pumps 25 form a circulating power core. The liquid pumps 25 can draw the liquid in the liquid tank 2 and deliver the liquid to the inside of the washing tower 1 through the liquid circulation pipes 21 for spraying operation, so as to realize the recycling of the liquid. The valves 22 on the liquid circulation pipes 21 play a role in flow regulation. According to the actual treatment conditions in the washing tower 1, such as the flow rate, concentration and treatment effect of the waste gas, the opening of the valve 22 can be accurately adjusted, so as to control the circulating flow rate of the liquid. When it is necessary to increase the spraying intensity to cope with high-concentration waste gas, the opening of the valve 22 can be appropriately increased. Conversely, when the concentration of the waste gas is low or the treatment effect has reached the requirement, the opening of the valve 22 can be reduced, so as to save energy and liquid resources. The pressure gauges 23 above the valves 22 provide intuitive data support for flow regulation. The operator can monitor the pressure change in the liquid circulation pipes 21 in real time.

[0037] In the embodiment, the centrifugal fan 4 is provided with a base 41, and a motor 42 is fixedly connected above the base 41. A pulley is cooperatively installed on one end of an output shaft of the motor 42 and the same side of the centrifugal fan 4, and the pulley is connected through a belt drive. A pipeline assembly 44 is cooperatively installed at an air outlet of the centrifugal fan 4, and the other end of the pipeline assembly 44 extends into the exhaust pipe 5.

[0038] By adopting the above technical scheme, the motor 42 is fixedly connected above the base 41, and a pulley is cooperatively installed on one end of an output shaft of the motor 42 and the same side of the centrifugal fan 4, and the pulley is connected through a belt drive. The belt drive has a certain elastic buffering effect, can effectively alleviate the impact generated in the starting and stopping moments of the motor 42, reduces the mechanical damage to the motor 42 and the centrifugal fan 4, prolongs the service life of the equipment, and ensures that the treated exhaust gas discharged from the centrifugal fan 4 can be smoothly and orderly discharged into the external environment through the exhaust pipe 5.

[0039] In the embodiment, the washing tower 1 is provided with a liquid storage tank inside the lower part, and the liquid pipe 14 extends into the liquid storage tank. A plurality of spray holes are formed in the liquid circulating pipe 21 inside the washing tower 1, and each of the spray holes is provided with a filler layer below and is fixedly connected with the inner wall of the washing tower 1. The washing tower 1 is provided with a gas-liquid separation device inside the upper part and is fixedly connected with the inner wall of the washing tower 1.

[0040] By adopting the above technical scheme, the washing tower 1 is provided with a liquid storage tank inside the lower part, and the liquid pipe 14 extends into the liquid storage tank. This design realizes the reasonable layout of the liquid supply, and the sprayed liquid drops into the liquid storage tank and then flows into the liquid tank 2 for recycling. When the liquid flows through the plurality of spray holes formed in the liquid circulating pipe 21, the liquid is dispersed into numerous fine mists, so that the surface area of the liquid is greatly expanded. The fine mists can fully contact the exhaust gas, greatly increasing the contact opportunity between the gas and the liquid, so that the acid-base components in the exhaust gas can more efficiently react with the sprayed liquid, or other pollutants soluble in the liquid can be more easily absorbed into the liquid, thereby fundamentally improving the preliminary treatment capacity of the washing tower 1 for acid-base exhaust gas. After being treated by spraying and the filler layer, the exhaust gas inevitably carries some liquid droplets. If the exhaust gas carrying the liquid droplets is directly discharged from the washing tower 1, on the one hand, the loss of the treatment liquid is caused, and on the other hand, the liquid droplets enter the subsequent active carbon adsorption tank 3 and the like, which may affect the normal operation of the equipment, such as blocking the pores of the active carbon, reducing the adsorption efficiency, and even being discharged with the finally discharged exhaust gas, causing secondary pollution and harming the environment.

[0041] In the embodiment, the filler layer inside the washing tower 1 is ceramic Raschig ring filler, polypropylene Paul ring filler, and metal wire mesh filler.

[0042] By adopting the above technical scheme, when treating acid and alkali waste gas, especially for waste gas containing strong acidic components, it can maintain stable chemical properties and will not be corroded and damaged, which makes the scrubbing tower still run normally in the face of high corrosive waste gas environment, prolonging the service life of the packing layer; the polypropylene Pall ring packing is of good chemical corrosion resistance and has certain resistance to various acid and alkali substances; the structural characteristics of the wire mesh packing make it have good liquid distribution performance, and the filtered gas contains liquid, which is separated from the gas by the wire mesh packing.

[0043] In the embodiment, the liquid tank 2 is internally provided with a liquid level monitoring sensor, which is in communication connection with an external control unit.

[0044] By adopting the above technical scheme, the liquid level monitoring sensor can obtain the height information of the liquid level in the liquid tank 2 in real time and accurately, and transmit it to the external control unit, and based on the feedback data, the control unit can timely judge whether the liquid amount in the liquid tank 2 is in a reasonable range.

[0045] In the embodiment, the fiber filter is arranged in the gas inlet 11 of the scrubbing tower 1 and is in matched connection with the inner wall of the gas inlet 11.

[0046] By adopting the above technical scheme, the fiber filter can play a preliminary filtering role on the acid and alkali waste gas entering the scrubbing tower 1 due to its unique fiber structure; the acid and alkali waste gas generated in the industrial production process often contains some large particle substances, such as dust, debris, and incompletely reacted raw material particles, etc., when the waste gas enters the scrubbing tower 1 through the gas inlet 11, these large particle substances will be intercepted on the filter due to the particle size being larger than the pore size of the fiber filter, and cannot further enter the inside of the scrubbing tower 1 along with the waste gas.

[0047] In the embodiment, the activated carbon adsorption tank 3 is internally provided with a granular activated carbon layer, and one side of the activated carbon adsorption tank 3 is provided with a maintenance door 31.

[0048] By adopting the above technical scheme, the granular activated carbon layer arranged in the activated carbon adsorption tank 3 has a developed pore structure, including micropores, mesopores and macropores of different scales, which greatly increases the specific surface area thereof, when the waste gas after preliminary treatment by the scrubbing tower 1 enters the activated carbon adsorption tank 3, the residual organic pollutants, trace amounts of acid and alkali gas and odor substances in the waste gas can be adsorbed on the pore surface of the granular activated carbon by means of intermolecular adsorption; the setting of the maintenance door 31 provides convenience for the replacement of the granular activated carbon layer and the later maintenance.

[0049] In the embodiment, the washing tower 1 is fixedly connected with a ladder 12 on one side, and a plurality of inspection openings are formed at the packing layer.

[0050] By adopting the above technical scheme, the ladder 12 enables the operator to safely and conveniently reach different height positions on the washing tower 1, especially the areas close to the packing layer and other areas that need to be focused on and maintained; when the operator performs daily inspection, fault checking or regular maintenance on the washing tower 1, the operator does not need to use complex external climbing equipment, but only needs to climb along the ladder 12 to quickly reach the corresponding height level, thereby saving time and effort for preparing and operating the external climbing tool and improving the efficiency of the maintenance work.

[0051] In the embodiment, the liquid pump 25 is provided with a protective cover 24 on the outside, and is fixedly connected with the top of the liquid tank 2.

[0052] By adopting the above technical scheme, the protective cover 24 prevents dust, sundries and other foreign matters in the external environment from entering the inside of the liquid pump 25 and accumulating at the impeller, the pump cavity and other parts, thereby affecting the normal operation of the liquid pump 25.

[0053] In the embodiment, the belt protective cover 43 is arranged at the belt wheel belt at one end of the output shaft of the motor 42.

[0054] By adopting the above technical scheme, the belt protective cover 43 effectively prevents the operator from accidentally contacting the high-speed running belt, thereby greatly ensuring the personal safety of the operator when the operator performs inspection, operates a valve or other daily maintenance work around the equipment, and creating a safe working environment for the operator.

[0055] The working principle of the utility model is as follows: the air inlet 11 is used as the inlet of the acid and alkali waste gas into the treatment device, and is arranged at one side of the washing tower 1, so that the waste gas can orderly enter the subsequent treatment link; the liquid tank 2 arranged at the opposite side provides a source of liquid medium required for treating the waste gas for the washing tower 1; the first gas outlet pipe 13 at the top of the washing tower 1 guides the waste gas after preliminary treatment to the activated carbon adsorption tank 3, and through the adsorption of the activated carbon, further purifies the residual organic pollutants, trace amounts of acid and alkali gas and odor substances and the like in the waste gas; the second gas outlet pipe 32 at the top of the activated carbon adsorption tank 3 transmits the gas after secondary purification to the centrifugal fan 4; the centrifugal fan 4 draws out the purified gas from the activated carbon adsorption tank 3, and discharges the gas to the atmospheric environment through the exhaust pipe 5 at one side of the centrifugal fan 4.

[0056] The liquid storage tank is arranged below the inside of the washing tower 1, and the liquid pipe 14 extends to the inside of the liquid storage tank, which realizes reasonable layout of the liquid supply, and the sprayed liquid drops into the liquid storage tank and then flows into the liquid tank 2 for recycling; the plurality of spray holes arranged on the liquid circulating pipe 21 can disperse the liquid into a plurality of fine mists when the liquid flows through the spray holes, so that the surface area of the liquid is greatly expanded, the fine mists can fully contact the waste gas, the contact opportunity between the gas and the liquid is greatly increased, the acid-base components in the waste gas can more efficiently react with the spray liquid, or other pollutants soluble in the liquid can be more easily absorbed into the liquid, and the preliminary treatment capacity of the washing tower 1 for the acid-base waste gas is fundamentally improved; the waste gas after the spray and the filler layer treatment inevitably carries some liquid droplets, if the waste gas carrying the liquid droplets is directly discharged from the washing tower 1, on the one hand, the treatment liquid is lost, and on the other hand, the liquid droplets enter the subsequent activated carbon adsorption tank 3 and other equipment, which may affect the normal operation of the equipment, for example, block the pores of the activated carbon, reduce the adsorption efficiency, and even be discharged with the finally discharged waste gas, causing secondary pollution and harming the environment.

[0057] It is apparent for those skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Accordingly, the embodiments should be considered as exemplary only, and not limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and range of equivalents of the elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0058] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and the person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by the person skilled in the art.

Claims

1. A multi-stage circulating environmental protection treatment device for acid and alkali waste gas, characterized in that: Including washing tower (1), the washing tower (1) one side is equipped with air inlet (11), the opposite side of air inlet (11) is equipped with liquid tank (2), the washing tower (1) top is fixedly connected with first gas outlet pipe (13), and the tail end one side of the first gas outlet pipe (13) is equipped with activated carbon adsorption tank (3), and is connected with cooperation;The activated carbon adsorption tank (3) top is fixedly connected with second gas outlet pipe (32), and the tail end of second gas outlet pipe (32) is connected with centrifugal fan (4), and one side of the centrifugal fan (4) is equipped with exhaust pipe (5).

2. The multi-stage circulating environmental protection treatment device for acid-base waste gas according to claim 1, characterized in that: The liquid tank (2) opposite washing tower (1) one side bottom is fixedly connected with liquid pipe (14), and the other end of liquid pipe (14) extends to the inside bottom of washing tower (1), and is fixedly connected with washing tower (1);The liquid tank (2) top is fixedly connected with two liquid pumps (25), and the one side of liquid pump (25) is each connected with liquid circulating pipe (21), and one end of the liquid circulating pipe (21) is arranged in the inside of liquid tank (2), and the other end extends to the inside of washing tower (1), and is fixedly connected with washing tower (1);Valve (22) is connected with the liquid circulating pipe (21), and the pressure gauge (23) is installed above the valve (22).

3. The multi-stage circulating acid-alkali off-gas environmental protection treatment device according to claim 1, characterized in that: The centrifugal fan (4) bottom is equipped with base (41), and the motor (42) is fixedly connected above the base (41), and the output shaft one end of the motor (42) and the same side of centrifugal fan (4) are each connected with pulley, and are connected by belt drive;The centrifugal fan (4) exhaust port is connected with pipe assembly (44), and the other end of the pipe assembly (44) extends to the inside of exhaust pipe (5).

4. The multi-stage circulating acid-alkali off-gas environmental protection treatment device according to claim 2, characterized in that: The inside bottom of the washing tower (1) is equipped with liquid storage tank, and the liquid pipe (14) extends to the inside of the liquid storage tank;A plurality of spray holes are formed in the liquid circulating pipe (21) inside the washing tower (1), and each of the spray holes is provided with a filler layer below and is fixedly connected with the inner wall of the washing tower (1);The inside upper portion of the washing tower (1) is provided with a gas-liquid separation device, and is fixedly connected with the inner wall of the washing tower (1).

5. The multi-stage circulating environmental protection treatment device for acid-base waste gas according to claim 1, characterized in that: The filler layer in the inside of the washing tower (1) is ceramic rasching ring filler, polypropylene bower ring filler and metal wire mesh filler.

6. The multi-stage circulating acid-alkali off-gas treatment device according to claim 2, characterized in that: The inside of the liquid tank (2) is provided with a liquid level monitoring sensor, and the liquid level monitoring sensor is in communication connection with an external control unit.

7. The multi-stage circulating acid-alkali off-gas treatment device of claim 5, wherein: The air inlet (11) of the washing tower (1) is provided with a fiber filter, and the fiber filter is connected with the inner wall of the air inlet (11).

8. The multi-stage circulating environmental protection treatment device for acid-base waste gas according to claim 1, characterized in that: The activated carbon adsorption tank (3) is provided with a granular activated carbon layer, and the activated carbon adsorption tank (3) is provided with an access door (31) on one side.

9. The multi-stage circulating environmental protection treatment device for acid-base waste gas according to claim 1, characterized in that: The washing tower (1) is fixedly connected with a crawling ladder (12) on one side, and a plurality of access openings are formed at the filler layer.

10. The multi-stage circulating environmental protection treatment device for acid and alkali waste gas according to claim 2, characterized in that: The liquid pump (25) is provided with a protective cover (24) on the outside, and the protective cover (24) is fixedly connected with the top of the liquid tank (2).

11. The multi-stage circulating environmental protection treatment device for acid and alkali waste gas according to claim 3, characterized in that: The pulley belt at the one end of the output shaft of the motor (42) is provided with a belt protective cover (43).

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