Multi-stage spray exhaust gas treatment device based on automatic pH regulation

Abstract

The application provides a multi-stage spraying waste gas treatment device based on automatic pH regulation, comprising an air inlet assembly, multiple treatment assemblies and an air outlet assembly; the air inlet ends and the air outlet ends of the multiple treatment assemblies are connected in series, the air inlet assembly is connected to the first treatment assembly, the air outlet assembly is connected to the last treatment assembly, and a complete waste gas purification channel is formed. The treatment assembly comprises a spraying tank and a spraying assembly, the spraying tank is provided with a first storage tank and a second storage tank on both sides, which are used for temporarily storing the waste gas to be treated and collecting the purified waste gas respectively. The first storage tank is provided with a pH sensor, and the second storage tank is provided with an agitator tank which is connected to an external liquid supply structure and the spraying assembly. The device can monitor the acid-base value of the waste gas in real time, automatically adjust the spraying liquid with the appropriate concentration, solve the problem that the traditional spraying device relies on manual dispensing and cannot adapt to the pH fluctuation of the waste gas, leading to insufficient acid-base neutralization and excessive tail gas, reduce the waste of reagents, and ensure the continuous and stable operation of the waste gas purification.

Description

Technical Field

[0001] This invention belongs to the field of waste gas treatment technology, and more specifically, relates to a multi-stage spray waste gas treatment device based on automatic pH control. Background Technology

[0002] Industrial production processes continuously generate process waste gas containing acidic and alkaline pollutants. In order to achieve harmless and compliant emissions of waste gas, it is necessary to use multi-stage spray waste gas treatment devices. This can effectively remove the acidic and alkaline harmful components inside the waste gas through acid-base spray neutralization, thereby meeting environmental protection emission control requirements.

[0003] However, in actual use, spray exhaust gas treatment equipment needs to match the corresponding concentration of spray solution in real time according to the changes in the acidity and alkalinity of the exhaust gas. However, most traditional multi-stage spray treatment devices lack the structure of automatically adjusting the dosing according to the acidity and alkalinity of the exhaust gas. They can only rely on manual sampling and testing at regular intervals and manual addition of agents. They cannot accurately adjust the spray agent ratio according to the pH fluctuation of the inlet exhaust gas in real time. This results in problems such as insufficient alkaline solution addition when the exhaust gas is too acidic and insufficient acid solution addition when the exhaust gas is too alkaline, causing incomplete neutralization reaction of exhaust gas and excessive exhaust gas pollutants. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a multi-stage spray exhaust gas treatment device based on automatic pH control. This solves the technical problem in the prior art where traditional multi-stage spray treatment devices rely on manual dosing and cannot automatically adjust the dosing according to fluctuations in the pH of the exhaust gas, resulting in insufficient neutralization of the exhaust gas and unstable purification effects.

[0005] The purpose and effectiveness of the multi-stage spray exhaust gas treatment device based on automatic pH control of the present invention are achieved by the following specific technical means: A multi-stage spray exhaust gas treatment device based on automatic pH control includes an air intake component for exhaust gas pretreatment and purification, multiple treatment components for acid and alkali neutralization and washing of exhaust gas, and an exhaust component for tail gas demisting. The air inlet and air outlet of the multiple sets of processing components are connected in series. The air outlet of the air inlet component is connected to the air inlet of one set of processing components, and the air inlet of the exhaust component is connected to the air outlet of another set of processing components. The processing assembly includes a spray tank and a spray assembly for atomizing and spraying the liquid medicine inside the tank. A first storage box for temporarily storing the waste gas to be treated that is about to enter the spray tank and a second storage box for collecting the purified waste gas after the spray tank has been processed are respectively provided on both sides of the spray tank. The air inlet of the spray tank is connected to the first storage box, and the air outlet of the spray tank is connected to the second storage box. The first storage tank is equipped with a pH sensor, and the second storage tank is equipped with a stirring tank for preparing the required spray solutions at each stage and mixing the raw materials of the agent. The stirring tank is connected to the external liquid supply structure and the spray assembly.

[0006] Furthermore, the air intake assembly includes an air intake tank, in which exhaust gas flows from bottom to top. The air intake tank is provided with a filter section, a flow equalization section, and a condensation section. The filter section, the flow equalization section, and the condensation section are arranged sequentially from bottom to top along the air intake tank. The air intake tank is connected to the first storage tank in one of the sets of processing assemblies. The air inlet tank is equipped with an air inlet for introducing the raw waste gas to be treated; The filtration unit includes a filter plate installed inside the air inlet tank for intercepting solid dust and particulate impurities in the exhaust gas. The flow equalization section includes a flow equalization air distribution plate installed inside the air inlet tank for dispersing turbulent airflow; The condensation section includes a condensation box installed on the top of the air inlet tank and condensation pipes installed inside it for condensing and removing water vapor and oily mist droplets in the exhaust gas. The air inlet pipe is connected to the condensation box, and the condensation pipes are connected to an external cooling structure.

[0007] Furthermore, a collection box is provided inside the condensation box, the collection box is located below the condensation pipe fitting, and the condensation pipe fitting is provided with a guide for guiding the condensate adhering to the surface of the condensation pipe fitting, the guide being perpendicular to the top of the collection box; The condenser box has guide plates on both opposite inner sides, and one side of the guide plate contacts the outside of the condenser fitting.

[0008] Furthermore, the spray tank is provided with a spray zone and two sets of buffer zones. The spray zone is located between the two sets of buffer zones, and the diameter of the spray tank located in the spray zone is smaller than the diameter of the spray tank located in the buffer zone.

[0009] Furthermore, the spray assembly includes multiple sets of spray elements, and the spray tank has multiple sets of mounting slots corresponding to the spray elements. The mounting slots are located in the spray area, the spray elements are fitted into the mounting slots, and the spray elements are connected to the mixing tank. The spray element is provided with multiple sets of atomizing nozzles on its inner side. A spray water curtain is formed by the multiple sets of atomizing nozzles on the spray element. When the exhaust gas in the spray tank flows from bottom to top, it passes through the spray water curtain.

[0010] Furthermore, the spray assembly also includes a manifold tank, which is installed in the buffer zone located below the spray zone, with the opening of the manifold tank facing the spray zone; The outer diameter of the manifold is larger than the inner diameter of the spray tank located in the spray zone, but smaller than the inner diameter of the spray tank located in the buffer zone; The spray tank located in the spray zone is equipped with a flow guide plate, which forms an inverted trumpet shape.

[0011] Furthermore, the bottom of the manifold is provided with a drain pipe, which is installed at the bottom of the manifold to form a drain pipe. A through groove is opened at the bottom of the manifold, and the manifold is connected to the drain pipe through the through groove. The bottom of the drain pipe is provided with a first connecting pipe, and a second connecting pipe is provided on one side of the spray tank. One end of the second connecting pipe extends from the outside of the spray tank to the inside of the spray tank and is connected to the first connecting pipe. The other end of the second connecting pipe is connected to the waste liquid treatment mechanism.

[0012] Furthermore, the drain pipe is equipped with a threaded push rod for pushing the waste liquid, deposited salt residue, and impurities in the manifold. The threaded push rod is rotatably connected to the drain pipe. A motor is provided on one side of the spray tank, and the motor shaft passes through the spray tank and is connected to the threaded push rod.

[0013] Furthermore, the exhaust assembly includes an exhaust canister connected to the second storage tank in one of the sets of processing assemblies; The exhaust tank is equipped with a baffle-type demister for removing exhaust mist. The exhaust tank is equipped with an exhaust port for discharging compliant exhaust gas after demisting and purification.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention sets up multiple sets of series-connected processing components to form a complete waste gas treatment pathway in conjunction with the air intake and exhaust components. A pH sensor installed in the first storage tank monitors the acidity and alkalinity of the waste gas in real time. A mixing tank in the second storage tank automatically prepares the chemical solution, allowing for adjustments to the spray solution ratio based on real-time acidity and alkalinity fluctuations in the waste gas. This eliminates the reliance on manual timed monitoring and manual dosing of traditional equipment. It dynamically matches the corresponding spray solution according to changes in the acidity and alkalinity of the waste gas, improving the situation of unbalanced chemical dosing when the acidity and alkalinity of the waste gas fluctuates. This effectively avoids problems such as insufficient neutralization reaction and excessive pollutants in the exhaust gas, enhancing the overall stability of multi-stage spray waste gas treatment.

[0015] 2. The air intake component of this invention can filter, equalize, and condense the raw exhaust gas for pretreatment, effectively removing dust particles, water vapor, and oily droplets from the exhaust gas, reducing equipment blockage caused by impurities entering the spray unit, and lowering the equipment maintenance load. The spray tank adopts a variable diameter structure combined with spray components and a manifold slag discharge structure, which can stabilize the gas-liquid contact conditions and promptly discharge spray waste liquid, deposited salt slag, and impurities, avoiding pipeline clogging. The end exhaust component can effectively remove tail gas mist, reducing reagent consumption. The entire device, combined with an automatic pH control structure, realizes integrated operation of exhaust gas pretreatment, multi-stage acid-base graded purification, automatic waste liquid slag discharge, and tail gas demisting emission. It has a high degree of automation, stable exhaust gas purification effect, and is suitable for complex working conditions with fluctuating acid and alkali in industrial exhaust gas, making it more practical. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the assembled structure of the present invention; Figure 2 This is a schematic diagram of the disassembled intake assembly of the present invention; Figure 3 This is a right view of the air intake assembly of the present invention; Figure 4 yes Figure 3 Cross-sectional view of region AA in the middle; Figure 5 This is a schematic diagram of the disassembled condenser section of the present invention; Figure 6 This is a front view of the condenser section of the present invention; Figure 7 yes Figure 6 Cross-sectional view of the BB region; Figure 8 This is a schematic diagram of the exhaust assembly of the present invention; Figure 9 This is a schematic diagram of the disassembled spray tank of the present invention; Figure 10 This is a right view of the spray tank of the present invention; Figure 11 yes Figure 10 Cross-sectional view of the CC region.

[0017] In the diagram, the correspondence between component names and their corresponding reference numerals is as follows: 11. Spray tank; 12. First storage tank; 13. Second storage tank; 14. pH sensor; 15. Mixing tank; 21. Air inlet tank; 22. Filter plate; 23. Flow distribution plate; 24. Condenser; 25. Condenser fittings; 26. Collection box; 27. Guide component; 28. Guide plate; 31. Spray component; 32. Mounting groove; 33. Atomizing nozzle; 34. Manifold; 35. Drain plate; 36. Drain pipe; 37. First connecting pipe; 38. Second connecting pipe; 39. Threaded push rod; 41. Exhaust tank. Detailed Implementation

[0018] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the technical solutions of the present invention, but should not be used to limit the scope of protection of the present invention.

[0019] Example: like Figures 1 to 11 As shown, this invention provides a multi-stage spray exhaust gas treatment device based on automatic pH control, including an air intake component for exhaust gas pretreatment and purification, multiple sets of treatment components for acid-base neutralization and washing of exhaust gas, and an exhaust component for tail gas demisting. The air intake component is responsible for completing impurity filtration, cooling and condensation, and airflow uniformity before the exhaust gas enters the main purification process, removing dust, condensed water vapor, and oil mist impurities inside the exhaust gas in advance, reducing the probability of clogging of the downstream spray unit. The multiple sets of treatment components serve as the main structure for acid-base neutralization and purification of exhaust gas, relying on the contact reaction between the sprayed liquid and the exhaust gas to remove gaseous acid and base pollutants. The exhaust component performs demisting treatment on the tail gas after multi-stage spraying, intercepting the liquid droplets carried by the tail gas, and the treated tail gas is discharged outward.

[0020] The inlet and outlet ends of multiple treatment components are connected in series. The outlet end of the inlet component is connected to the inlet end of one of the treatment components, and the inlet end of the exhaust component is connected to the outlet end of another treatment component. The series arrangement allows the waste gas to flow through each stage of the treatment components in sequence. During the step-by-step process, the waste gas undergoes acid washing, alkali washing, and neutralization treatment, which extends the overall treatment path of the waste gas and improves the pollutant removal effect. The inlet and outlet ends are respectively connected to the inlet and exhaust components to realize a complete closed conveying process of waste gas from pre-treatment to final exhaust emission.

[0021] The system comprises three treatment components. The first component is used for acid washing and purification of the pretreated exhaust gas, removing alkaline gaseous pollutants such as ammonia and organic amines from the exhaust gas through acidic spraying. The second component is used for alkaline washing and purification of the acid-washed exhaust gas, removing residual acidic pollutants such as sulfur dioxide, hydrogen chloride, and hydrogen sulfide from the exhaust gas through alkaline spraying. The third component is used for neutralization and fine-tuning of the alkaline-washed exhaust gas, neutralizing residual acid and alkaline components in the exhaust gas, stabilizing the acid-base state of the tail gas, reducing mist and acid-base residue in the tail gas, and ensuring that the exhaust gas meets the subsequent exhaust conditions.

[0022] The treatment assembly includes a spray tank 11 and a spraying component for atomizing and spraying the liquid medicine inside the tank. A first storage tank 12 for temporarily storing the waste gas to be treated before entering the spray tank 11 and a second storage tank 13 for collecting the purified waste gas after treatment by the spray tank 11 are respectively provided on both sides of the spray tank 11. The air inlet of the spray tank 11 is connected to the first storage tank 12, and the air outlet of the spray tank 11 is connected to the second storage tank 13. The spray tank 11 is a closed cavity for gas-liquid counter-current contact reaction, and its interior contains space for arranging the spraying component. The spray liquid provides a contact area with the upward exhaust gas; the first storage tank 12 retains the exhaust gas delivered from the preceding components, buffers the airflow fluctuations caused by the intake air, and avoids sudden changes in airflow from interfering with the spray reaction conditions inside the tank. The exhaust gas stored in the tank is continuously sent into the spray tank 11 under the action of pressure difference; the second storage tank 13 collects the exhaust gas after the spray tank 11 has been purified, and plays a role in stabilizing pressure and buffering. The exhaust gas collected inside the tank is transported to the first storage tank 12 of the next-level processing component, completing the transition from the single-stage process to the subsequent process.

[0023] The first storage tank 12 is equipped with a pH sensor 14, and the second storage tank 13 is equipped with a stirring tank 15 for preparing the required spray solutions at each stage and mixing the raw materials. The stirring tank 15 is connected to the external liquid supply structure and the spray assembly. The pH sensor 14 collects the acid and alkalinity values ​​of the exhaust gas inside the first storage tank 12 in real time. The collected data serves as a reference for the concentration of the solution prepared by the stirring tank 15. The pH sensor 14 can be a CPS11D-7BA21 digital pH sensor. The stirring tank 15 receives acid, alkali and water raw materials from the external liquid supply structure. During the operation of the tank, the various raw materials are stirred to achieve mixing and preparation. The prepared spray solution is then transported to the inside of the spray assembly for continuous use in the spraying operation.

[0024] The entire device receives signals and performs logic control through an external controller. The controller receives the acidity and alkalinity detection signal transmitted by the pH sensor 14 and sends start and stop commands to the corresponding reagent feed pipeline of the mixing tank 15 based on the monitoring data. This changes the amount of acid or alkali added and adjusts the concentration of the prepared medicine solution inside the mixing tank 15. The prepared medicine solution is then sent to the spray assembly to participate in the waste gas neutralization reaction.

[0025] like Figures 2 to 7As shown, the air intake assembly includes an air intake tank 21. Exhaust gas flows from bottom to top within the air intake tank 21. The air intake tank 21 is equipped with a filtration section, a flow equalization section, and a condensation section, arranged sequentially from bottom to top along the tank. The air intake tank 21 is connected to the first storage tank 12 in one of the processing components. The air intake tank 21 serves as the exhaust gas pretreatment chamber for the entire device, providing installation space and a sealed flow environment for the internal multi-stage pretreatment structure. The bottom-up flow of the exhaust gas extends its residence time within the tank. The layered filtration section, flow equalization section, and condensation section sequentially perform impurity filtration, airflow regulation, and cooling / condensation operations on the exhaust gas. The pretreated exhaust gas can be directly transported to the first storage tank 12, providing a suitable exhaust gas source for subsequent multi-stage spray purification processes.

[0026] The air inlet tank 21 is equipped with an air inlet for introducing raw waste gas to be treated; the air inlet connects to an external waste gas conveying pipeline, which can stably introduce the raw waste gas generated in production into the internal cavity of the air inlet tank 21, realize the continuous feeding and conveying of waste gas, and ensure the continuous operation of the entire waste gas treatment device.

[0027] The filtration section includes a filter plate 22 installed inside the air inlet tank 21 to intercept solid dust and particulate impurities in the exhaust gas. The filter plate 22 is arranged horizontally in the bottom area inside the air inlet tank 21. As the exhaust gas flows upward, it will pass directly through the filter plate 22. The solid impurities such as dust and particles carried in the exhaust gas will be intercepted and blocked by the filter plate 22, reducing the entry of solid impurities into the subsequent spray components, pipelines and packing structures, reducing the probability of internal blockage of the equipment and reducing the frequency of subsequent equipment maintenance.

[0028] The flow equalization section includes a flow equalization distribution plate 23 installed inside the air inlet tank 21 to disperse turbulent airflow. The flow equalization distribution plate 23 is arranged above the filter plate 22. After filtration, the exhaust gas flows upward and contacts the flow equalization distribution plate 23, which can disperse and divide the concentrated and turbulent airflow, change the situation of excessively fast local airflow velocity and uneven airflow distribution, and make the exhaust gas be uniformly transported upward along the cross section of the air inlet tank 21, ensuring that the exhaust gas is in full contact with the condenser pipe 25 during the subsequent condensation process.

[0029] The condensation section includes a condensation box 24 located at the top of the air inlet tank 21 and condensation pipes 25 inside the tank for condensing and removing water vapor and oily mist droplets from the exhaust gas. The air inlet pipe is connected to the condensation box 24, and the condensation pipes 25 are connected to an external cooling structure. The condensation box 24 is a sealed cavity for top-level condensation pretreatment, used to house the condensation pipes 25 and supporting flow guiding and collection structures. After flow equalization treatment, the exhaust gas continuously enters the condensation box 24. The condensation pipes 25 are connected to a low-temperature medium supplied by the external cooling structure, keeping the surface of the pipes at a low temperature. When the high-temperature and high-humidity exhaust gas flows through the outside of the condensation pipes 25, heat exchange occurs. The gaseous water vapor and oily mist droplets contained in the exhaust gas undergo phase change and condense upon cooling, separating from the exhaust gas. This reduces the humidity of the exhaust gas, removes oily impurities from the exhaust gas, and reduces the operating load of the downstream spray purification unit.

[0030] A collection box 26 is installed inside the condensation box 24. The collection box 26 is located below the condensation pipe fitting 25. The condensation pipe fitting 25 is equipped with a guide 27 for guiding the condensate adhering to the surface of the condensation pipe fitting 25. The guide 27 is perpendicular to the top of the collection box 26. The liquid water and oil generated by the condensation of the exhaust gas will adhere to the outer wall of the condensation pipe fitting 25. The guide 27 can guide the condensate adhering to the pipe wall, so that the condensate drips in a fixed direction and falls vertically into the collection box 26 below, realizing the centralized collection of condensate waste liquid and preventing condensate from dripping and accumulating inside the equipment at will.

[0031] The condenser box 24 is equipped with guide plates 28 on both opposite inner sides. One side of the guide plate 28 contacts the outside of the condenser pipe fitting 25. Some condensate will adhere to the inner wall of the condenser box 24. The guide plates 28 can guide the condensate flowing on the inner wall of the box, so that the condensate accumulated on the wall flows to the collection box 26. Together with the guide fitting 27, all the condensate waste liquid is collected in a centralized manner, avoiding the condensate from stagnating and accumulating inside the condenser box 24, and preventing the waste liquid from evaporating again and mixing into the exhaust gas.

[0032] like Figures 8 to 11 The spray tank 11 is equipped with a spray zone and two buffer zones. The spray zone is located between the two buffer zones, and the diameter of the spray tank 11 located in the spray zone is smaller than that of the spray tank 11 located in the buffer zones. The spray tank 11 divides the buffer zones and the spray zone by segmented diameter differences. The upper and lower buffer zones have larger cavities, which can buffer the airflow of the exhaust gas before and after entering the spray zone, reduce airflow pulsation and velocity fluctuations during the exhaust gas's journey, and prevent the airflow velocity from directly dispersing the spray liquid layer. The spray zone cavity in the middle position is relatively constricted, which can reduce the exhaust gas flow cross-section, appropriately increase the upward velocity of the exhaust gas, and allow the exhaust gas to make sufficient contact with the spray liquid inside the spray zone, ensuring the contact time of the gas-liquid reaction and stabilizing the overall exhaust gas treatment conditions inside the tank.

[0033] The spray assembly includes multiple spray elements 31. Multiple mounting slots 32 are provided on the spray tank 11 corresponding to the spray elements 31. The mounting slots 32 are located in the spray area, and the spray elements 31 are fitted into the mounting slots 32, connecting to the mixing tank 15. The multiple mounting slots 32 are evenly distributed on the side wall of the spray area, providing fixed installation positions for the spray elements 31. The snap-fit ​​assembly method facilitates the disassembly, maintenance, and replacement of the spray elements 31. The spray elements 31 are connected to the liquid outlet pipe of the mixing tank 15, allowing the prepared spray solution inside the mixing tank 15 to be continuously delivered to the spray elements 31, providing a stable supply of solution for the spray purification operation.

[0034] Multiple sets of atomizing nozzles 33 are installed inside the spray element 31. These nozzles form a spray water curtain, through which the exhaust gas in the spray tank 11 flows upwards and passes. The atomizing nozzles 33 are evenly distributed within the inner area of ​​the spray element 31. The chemical solution entering the spray element 31 is finely atomized by the nozzles, forming a uniformly distributed spray water curtain that covers the entire flow section of the spray area. As the exhaust gas passes through the spray water curtain from bottom to top, the acidic and alkaline pollutants in the exhaust gas come into full contact with the atomized chemical solution and undergo a neutralization reaction, achieving the removal and purification of pollutants and completing the single-stage spray purification operation.

[0035] The spray assembly also includes a manifold 34, which is installed in the buffer zone below the spray tank 11. The opening of the manifold 34 faces the spray zone. Positioned below the spray zone, the manifold 34 collects the waste liquid falling from the spray zone, centrally collecting and storing the waste liquid after the spray reaction to prevent it from spilling. The opening of the manifold 34 facing the spray zone expands the waste liquid receiving area, allowing most of the waste liquid falling from the spray zone to fall into the manifold 34, achieving centralized collection and treatment of the waste liquid.

[0036] The outer diameter of the manifold 34 is larger than the inner diameter of the spray tank 11 located in the spray zone, but smaller than the inner diameter of the spray tank 11 located in the buffer zone. This size structure allows the manifold 34 to be stably placed inside the lower buffer zone of the spray tank 11 without occupying the airflow space in the spray zone or obstructing the normal flow of upward exhaust gas. At the same time, it can shield and limit the falling waste liquid, reducing the situation of waste liquid flowing along the wall and improving the waste liquid collection efficiency.

[0037] The spray tank 11, located in the spray zone, is equipped with a guide plate 35, which forms an inverted trumpet shape. The guide plate 35 creates a channel structure that is wider at the top and narrower at the bottom at the lower end of the spray zone. Waste liquid that has completed the reaction in the spray zone flows rapidly downwards along the surface of the guide plate 35, guiding it to converge uniformly at the opening of the manifold 34, reducing the amount of waste liquid remaining on the inner wall of the manifold. Simultaneously, the guide plate 35 regulates the flow of exhaust gas, ensuring that the exhaust gas steadily flows upwards through the spray zone.

[0038] The bottom of the manifold 34 is provided with a drain pipe 36, which forms a drain pipe. The bottom of the manifold 34 is provided with a through groove, which connects the manifold 34 to the drain pipe. The waste liquid collected inside the manifold 34 can flow into the drain pipe 36 through the bottom through groove. The through groove serves as a waste liquid flow channel, realizing fluid communication between the manifold 34 and the drain pipe 36, so that the collected waste liquid can be smoothly transported downwards to complete the discharge of waste liquid from the tank.

[0039] A first connecting pipe 37 is provided at the bottom of the drain pipe 36, and a second connecting pipe 38 is provided on one side of the spray tank 11. One end of the second connecting pipe 38 extends from the outside of the spray tank 11 into the spray tank 11 and connects to the first connecting pipe 37. The other end of the second connecting pipe 38 connects to the waste liquid treatment mechanism. The first connecting pipe 37 is used to receive the waste liquid transported by the drain pipe 36 and guide the waste liquid into the second connecting pipe 38. The second connecting pipe 38 is set through the spray tank 11, which can directly transport the waste liquid discharged from the tank to the external waste liquid treatment mechanism, realizing the external discharge and subsequent centralized treatment of waste liquid, and avoiding the long-term accumulation of waste liquid inside the equipment.

[0040] The drain pipe 36 is equipped with a threaded push rod 39 for pushing the waste liquid and deposited salt residue and impurities in the manifold 34. The threaded push rod 39 is rotatably connected to the drain pipe 36. A motor is installed on one side of the spray tank 11, and the motor shaft passes through the spray tank 11 and is connected to the threaded push rod 39. When the motor is working, it can drive the threaded push rod 39 to rotate continuously inside the drain pipe 36. During the rotation of the threaded push rod 39, an axial pushing force is generated, which can push the waste liquid flowing inside the drain pipe 36, and at the same time drive the deposited salt residue and solid impurities in the pipe to be transported outwards. This reduces the adhesion and accumulation of salt residue and impurities inside the drain pipe 36, reduces the probability of blockage of the drain pipe, and ensures the continuous and smooth discharge of waste liquid.

[0041] like Figure 1 As shown, the exhaust assembly includes an exhaust tank 41, which is connected to a second storage tank 13 in one of the processing components. The exhaust gas, after being purified by multi-stage spraying, is sent from the inside of the second storage tank 13 into the exhaust tank 41. The exhaust tank 41 provides a sealed cavity space to accommodate demisting components and serves as the final treatment station before exhaust gas emission, receiving the waste gas delivered from the previous process.

[0042] The exhaust tank 41 is equipped with a baffle plate demister for removing exhaust gas mist. When the exhaust gas flows through the baffle plate demister inside the exhaust tank 41, the airflow continuously changes its direction. The fine liquid droplets carried by the exhaust gas impact the surface of the demister plate due to inertia. After the droplets gather, they drip down along the plate surface and separate, thereby intercepting the sprayed liquid carried by the exhaust gas and reducing the loss of the liquid agent caused by the exhaust gas being discharged with the exhaust gas.

[0043] The exhaust tank 41 is equipped with an exhaust port for discharging the qualified exhaust gas after demisting and purification. The exhaust gas after demisting is collected at the exhaust port and continuously discharged to the outside of the device, completing the exhaust gas discharge process of the entire waste gas treatment process.

[0044] Specific usage instructions: In use, connect the air inlet of the air inlet tank 21 to the production waste gas conveying pipeline, connect the second connecting pipe 38 to the external waste liquid treatment mechanism, connect the exhaust port of the exhaust tank 41 to the tail gas emission pipeline, connect the mixing tank 15 to the external acid, alkali and clean water supply structure, connect the condenser fitting 25 to the external cooling structure, and electrically connect the pH sensor 14, the mixing tank 15 and the motor of the drive threaded push rod 39 to the external controller to complete the connection and installation of the overall pipeline and circuit of the equipment.

[0045] After the equipment is started and running, the raw waste gas generated during production continuously enters the air inlet tank 21 through the air inlet. The waste gas flows from bottom to top inside the air inlet tank 21, first passing through the filter plate 22. The filter plate 22 intercepts the dust and solid particulate impurities carried in the waste gas, completing the initial solid-gas separation of the waste gas. The filtered waste gas continues to flow upward through the uniform flow distribution plate 23, and the turbulent airflow is evenly dispersed, so that the waste gas is evenly distributed in the cross section of the air inlet tank 21. The evenly flowing waste gas continues to enter the top condenser box 24. The low-temperature condenser fittings 25 exchange heat with the waste gas, condensing and separating the water vapor and oily mist droplets inside the waste gas. The waste liquid generated by condensation adheres to the surface of the condenser fittings 25 and the inner wall of the condenser box 24, and is guided by the guide component 27 and the guide plate 28 to flow into the collection box 26, completing the waste gas pretreatment operation.

[0046] The pretreated exhaust gas is transported from the inlet tank 21 to the first storage tank 12 of the first group of treatment components for temporary storage. The pH sensor 14 installed inside the first storage tank 12 continuously detects the acid and alkalinity values ​​of the exhaust gas in real time and transmits the detection signal to the external controller in real time. According to the received acid and alkalinity detection signal, the controller controls the start and stop of the reagent feed pipeline of the stirring tank 15, adjusts the feed amount of acid or alkali, and mixes it with clean water to prepare a spray solution suitable for the current exhaust gas conditions. The prepared solution is then transported to the interior of each group of spray components 31.

[0047] The exhaust gas temporarily stored in the first storage tank 12 enters the spray tank 11 upward under the action of pressure difference, and flows through the lower buffer zone, the spray zone and the upper buffer zone in sequence. In the spray zone, the exhaust gas passes through the spray water curtain formed by the atomizing nozzle 33 from bottom to top, and comes into full contact with the atomized liquid to undergo a neutralization reaction. The first group of treatment components removes alkaline pollutants from the exhaust gas with acidic liquid, the second group of treatment components removes acidic pollutants from the exhaust gas with alkaline liquid, and the third group of treatment components performs acid-base neutralization fine adjustment on the exhaust gas. The multi-stage series treatment components gradually complete the purification of the exhaust gas.

[0048] The waste liquid generated by the spray reaction is guided by the diversion plate 35 and falls into the manifold 34. The waste liquid collected in the manifold 34 flows into the drain pipe 36 through the bottom channel. During the operation of the equipment, the motor continuously drives the threaded push rod 39 to rotate, axially pushing the waste liquid, sedimented salt residue and solid impurities in the drain pipe 36, so that the waste liquid and impurities are transported to the external waste liquid treatment mechanism in sequence through the first connecting pipe 37 and the second connecting pipe 38, avoiding pipeline blockage and ensuring continuous discharge of waste liquid.

[0049] After being purified by the single-group spray tank 11, the exhaust gas is fed into the second storage tank 13 for pressure stabilization and buffering, and then sequentially transported to the next stage of treatment components for further purification. After the exhaust gas completes all purification processes of acid washing, alkali washing, and neutralization, it is finally transported from the second storage tank 13 of the last treatment component to the exhaust tank 41. Inside the exhaust tank 41, the exhaust gas flows through a baffle plate demister, where the inertial effect of the airflow change direction traps the chemical mist carried by the exhaust gas, completing the exhaust gas demisting treatment. Finally, the purified exhaust gas is discharged out through the exhaust port, completing the entire continuous exhaust gas treatment operation.

[0050] Throughout the entire operation of the equipment, the pH sensor 14 monitors in real time and the controller automatically adjusts the concentration of the reagent in the mixing tank 15, which can adapt to the dynamic changes in the acidity and alkalinity of the waste gas and maintain a stable waste gas purification effect.

[0051] The foregoing has shown and described the basic principles and main features of the present invention and its advantages. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments.

Claims

1. A multi-stage spray exhaust gas treatment device based on automatic pH control, comprising an air inlet assembly for exhaust gas pretreatment and purification, multiple sets of treatment assemblies for acid-base neutralization and washing of exhaust gas, and an exhaust assembly for tail gas demisting, characterized in that: The air inlet and air outlet of the multiple sets of processing components are connected in series. The air outlet of the air inlet component is connected to the air inlet of one set of processing components, and the air inlet of the exhaust component is connected to the air outlet of another set of processing components. The processing assembly includes a spray tank (11) and a spray assembly for atomizing and spraying the liquid medicine inside the tank. The spray tank (11) is provided with a first storage box (12) for temporarily storing the waste gas to be treated that is about to enter the spray tank (11) and a second storage box (13) for collecting the purified waste gas after the spray tank (11) has been processed. The air inlet of the spray tank (11) is connected to the first storage box (12), and the air outlet of the spray tank (11) is connected to the second storage box (13). The first storage tank (12) is equipped with a pH sensor (14), and the second storage tank (13) is equipped with a stirring tank (15) for preparing the required spray solution and mixing the raw materials of the agent. The stirring tank (15) is connected to the external liquid supply structure and the spray assembly.

2. The multi-stage spray exhaust gas treatment device based on automatic pH control according to claim 1, characterized in that: The air intake assembly includes an air intake tank (21), in which exhaust gas flows from bottom to top. The air intake tank (21) is provided with a filter section, a flow equalization section, and a condensation section. The filter section, the flow equalization section, and the condensation section are arranged sequentially from bottom to top along the air intake tank (21). The air intake tank (21) is connected to the first storage tank (12) in one of the processing assemblies. The air inlet (21) is provided with an air inlet for introducing the raw waste gas to be treated; The filtration section includes a filter plate (22) installed inside the air inlet tank (21) for intercepting solid dust and particulate impurities in the exhaust gas. The flow equalization section includes a flow equalization air distribution plate (23) installed inside the air inlet tank (21) for dispersing turbulent airflow. The condensation section includes a condensation box (24) installed on the top of the air inlet tank (21) and a condensation pipe (25) installed inside it for condensing and removing water vapor and oily mist droplets in the exhaust gas. The air inlet pipe is connected to the condensation box (24), and the condensation pipe (25) is connected to the external cooling structure.

3. The multi-stage spray exhaust gas treatment device based on automatic pH control according to claim 2, characterized in that: The condenser box (24) is provided with a collection box (26), which is located below the condenser fitting (25). The condenser fitting (25) is provided with a guide (27) for guiding the condensate adhering to the surface of the condenser fitting (25). The guide (27) is perpendicular to the top of the collection box (26). The condenser box (24) is provided with guide plates (28) on both opposite inner sides, and one side of the guide plate (28) is in contact with the outer side of the condenser fitting (25).

4. The multi-stage spray exhaust gas treatment device based on automatic pH control according to claim 1, characterized in that: The spray tank (11) is provided with a spray zone and two sets of buffer zones. The spray zone is located between the two sets of buffer zones. The diameter of the spray tank (11) located in the spray zone is smaller than the diameter of the spray tank (11) located in the buffer zone.

5. The multi-stage spray exhaust gas treatment device based on automatic pH control according to claim 4, characterized in that: The spray assembly includes multiple spray elements (31), and the spray tank (11) has multiple mounting slots (32) corresponding to the spray elements (31). The mounting slots (32) are located in the spray area, and the spray elements (31) are installed in the mounting slots (32). The spray elements (31) are connected to the mixing tank (15). Multiple sets of atomizing nozzles (33) are provided on the inner side of the spray component (31). A spray water curtain is formed by the multiple sets of atomizing nozzles (33) on the spray component (31). When the exhaust gas in the spray tank (11) flows from bottom to top, it passes through the spray water curtain.

6. The multi-stage spray exhaust gas treatment device based on automatic pH control according to claim 5, characterized in that: The spray assembly also includes a manifold (34), which is installed in a buffer zone below the spray tank (11), with the opening of the manifold (34) facing the spray zone. The outer diameter of the manifold (34) is larger than the inner diameter of the spray tank (11) located in the spray zone, but smaller than the inner diameter of the spray tank (11) located in the buffer zone; The spray tank (11) located in the spray zone is provided with a diversion plate (35), which forms an inverted trumpet shape.

7. The multi-stage spray exhaust gas treatment device based on automatic pH control according to claim 6, characterized in that: The manifold (34) is provided with a drain pipe (36) at the bottom. The drain pipe (36) is installed at the bottom of the manifold (34) to form a drain pipe. The manifold (34) is provided with a through groove at the bottom. The manifold (34) is connected to the drain pipe (36) through the through groove. The drain pipe (36) is provided with a first connecting pipe (37) at the bottom, and a second connecting pipe (38) is provided on one side of the spray tank (11). One end of the second connecting pipe (38) extends from the outside of the spray tank (11) to the inside of the spray tank (11) and is connected to the first connecting pipe (37). The other end of the second connecting pipe (38) is connected to the waste liquid treatment mechanism.

8. The multi-stage spray exhaust gas treatment device based on automatic pH control according to claim 7, characterized in that: The drain pipe (36) is provided with a threaded push rod (39) for pushing the waste liquid and deposited salt residue and impurities in the manifold (34). The threaded push rod (39) is rotatably connected to the drain pipe (36). A motor is provided on one side of the spray tank (11). The motor shaft passes through the spray tank (11) and is connected to the threaded push rod (39).

9. The multi-stage spray exhaust gas treatment device based on automatic pH control according to claim 1, characterized in that: The exhaust assembly includes an exhaust canister (41) connected to a second storage tank (13) in one of the processing assemblies; The exhaust tank (41) is equipped with a baffle plate demister for removing exhaust mist; The exhaust tank (41) is provided with an exhaust port for discharging qualified exhaust gas after demisting and purification.

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