Absorber for neutralizing acid mist in acid-alkali solution

Abstract

The invention relates to an acid mist absorber for neutralizing acid and alkali liquor, which comprises a raw alkali liquor tank and an absorption main body, a stirrer is arranged in the raw alkali liquor tank, a filler layer is arranged in the absorption main body, liquid distribution plates are arranged on the upper end face and the lower end face of the filler layer, and the absorption main body is divided into a lower alkali liquor storage cavity and an upper isolation cavity by the filler layer. The original alkali liquor tank is communicated with the diaphragm pump through the replenishment pump check valve, the diaphragm pump, the replenishment pump check valve, the replenishment pump outlet valve, the flow meter and the first switch valve are connected in series and then are communicated with the alkali liquor storage tank of the absorption main body, and the absorption main body is further provided with an air inlet pipeline, a purification outlet pipeline, a circulation pipeline and a liquor drainage pipeline. And safety and reliability are realized.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment technology, and in particular to an acid mist absorber for neutralization by acid and alkali solutions. Background Technology

[0002] Acid mist pollution originates from industrial production (such as electroplating and metallurgy), and traditional treatment methods include physical adsorption and simple spraying. Existing absorber equipment has long suffered from technical challenges, including: Existing equipment relies on manual, periodic monitoring of alkali concentration, which can easily lead to alkali failure due to untimely inspections, reducing acid mist treatment efficiency to below 80% and even resulting in the emission of substandard gases. Waste alkali discharge and new alkali replenishment require manual operation, which is cumbersome and poses safety hazards such as acid mist leakage and alkali splashing. Reaction precipitates easily accumulate in the alkali storage chamber, causing blockage of the concentration sensor and reduced detection accuracy. The inner wall of the equipment is easily corroded by acids and alkalis, shortening its service life. Furthermore, the lack of closed-loop control and remote alarm functions means that faults cannot be responded to in a timely manner.

[0003] Therefore, an acid-base neutralization acid mist absorber is provided to solve the above problems. Summary of the Invention

[0004] The main objective of this invention is to address the following problems in existing technologies: Firstly, existing equipment relies on manual, periodic monitoring of alkali concentration, which can easily lead to alkali failure due to untimely inspections, resulting in acid mist treatment efficiency dropping below 80% and even the emission of substandard gases. Secondly, the discharge of waste alkali and the replenishment of new alkali require manual operation, which is cumbersome and poses safety hazards such as acid mist leakage and alkali splashing. Thirdly, the alkali storage chamber is prone to the accumulation of reaction precipitates, causing blockage of concentration sensors and reduced detection accuracy. Fourthly, the inner walls of the equipment are easily corroded by acids and alkalis, shortening its service life. Finally, the lack of closed-loop control and remote alarm functions makes it impossible to respond to faults in a timely manner.

[0005] This invention provides an acid-base neutralization acid mist absorber, the acid-base neutralization acid mist absorber comprising: The original alkali solution tank includes a stirrer and an absorption body. The absorption body contains a packing layer with liquid distribution plates on both its upper and lower surfaces. The packing layer divides the absorption body into a lower alkali storage chamber and an upper isolation chamber. The original alkali solution tank is connected to a diaphragm pump via a replenishment pump check valve. The diaphragm pump, replenishment pump check valve, replenishment pump outlet valve, flow meter, and first switching valve are connected in series to the alkali storage tank of the absorption body. The absorption body also includes... The unit is equipped with an air inlet pipe, a purified outlet pipe, a circulation pipe, and a drain pipe. The drain pipe is located at the lower part of one side of the absorption body and is connected to the alkali storage chamber. The circulation pipe is located above the drain pipe, with one end connected to the alkali storage chamber and the other end connected to the isolation chamber. The air inlet pipe and the purified outlet pipe are both located at the upper end of the absorption body and are both connected to the isolation chamber.

[0006] Optionally, a liquid level gauge is installed on one side of the original alkali tank to detect the liquid level height inside the original alkali tank. A low liquid level sensor and a high liquid level sensor are installed on the side wall of the absorption body. A pH meter for the alkali storage chamber is also installed on the side wall of the absorption body. The detection head of the pH meter for the alkali storage chamber is vertically installed inside the alkali storage chamber. A porous stainless steel protective sleeve is fitted over the detection head of the pH meter for the alkali storage chamber. The diameter of the holes on the porous stainless steel protective sleeve is 2-5mm. A conical guide head is provided at the bottom of the porous stainless steel sleeve. The detection head of the pH meter for the alkali storage chamber maintains a gap of 3-5mm with the inner wall of the sleeve.

[0007] Optionally, the air inlet pipeline includes an acid mist inlet check valve and a second switching valve. One end of the acid mist inlet check valve is connected to the acid mist conveying fan, and the other end of the acid mist inlet check valve is connected to the second switching valve. The second switching valve is connected to the alkaline storage chamber of the absorption body.

[0008] Optionally, a purified gas outlet detection sensor is installed on the purified outlet pipeline.

[0009] Optionally, the circulation pipeline includes a circulation pump inlet valve, a Y-type filter, a circulation pump, a circulation pump check valve, a circulation pump outlet valve, and a spray assembly. The circulation pump inlet valve is connected to the alkali storage chamber of the absorption body. The circulation pump inlet valve, the Y-type filter, the circulation pump, the circulation pump check valve, and the circulation pump outlet valve are connected in series and then connected to the spray assembly. The spray assembly is fixedly installed in the isolation chamber inside the absorption body.

[0010] Optionally, the drainage pipeline includes a drainage pipe check valve, a drainage pipe solenoid valve, a waste alkali collection tank, and a waste alkali collection tank level gauge. One end of the drainage pipe check valve is connected to the alkali storage chamber inside the absorption body, and the other end of the drainage check valve is connected to the drainage pipe solenoid valve. The drainage pipe solenoid valve is connected to the waste alkali collection tank. A waste alkali collection tank level gauge is fixedly installed on the side wall of the waste alkali collection tank. A discharge port is opened on the side wall of the waste alkali collection tank, and a third switch valve is installed on the discharge port.

[0011] Optionally, the filler layer is filled with plastic multifaceted hollow spheres.

[0012] Optionally, the inner wall of the alkali storage chamber within the absorption body is coated with an FRP anti-corrosion coating, and the bottom of the alkali storage chamber has a 5°-10° inclined structure.

[0013] Optionally, a PLC closed-loop control box is also included. The PLC closed-loop control box is equipped with a PLC controller, a touch screen, an audible and visual alarm, and a remote communication module. The PLC controller is electrically connected to the touch screen, the audible and visual alarm, and the remote communication module. The PLC controller is also electrically connected to the stirrer, the original alkali tank level gauge, the replenishment pump inlet valve, the replenishment pump check valve, the replenishment pump outlet valve, the flow meter, the acid mist inlet check valve, the purified gas outlet detection sensor, the low level sensor, the high level sensor, the alkali storage chamber pH meter, the drain pipe solenoid valve, the drain pipe check valve, the diaphragm pump, the circulation pump, the circulation pump inlet valve, the circulation pump check valve, the circulation pump outlet valve, the waste alkali collection tank level gauge, the first switch valve, the second switch valve, and the third switch valve through the remote communication module.

[0014] This invention solves the problems of high reliance on manual labor, large fluctuations in treatment efficiency, and easy corrosion and clogging of traditional absorbers. It achieves an acid mist removal rate of ≥98%, strong continuous operation stability, and is suitable for acid mist treatment in multiple industries such as electroplating, chemical, and metallurgy. It automates the entire process of alkali concentration detection, failure assessment, drainage, and replenishment without manual intervention, reducing labor intensity by over 90% and avoiding human error. It also reduces acid mist leakage and equipment corrosion; leaves no residual liquid, preventing secondary pollution; and features a remote alarm function for rapid fault response, reducing environmental risks. The alkali type can be adjusted according to the type of acid mist (hydrochloric acid mist, sulfuric acid mist, etc.), and the equipment size can be adjusted according to the treatment capacity, making it suitable for various industrial scenarios. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the present invention; Figure 2 This is a structural diagram of the spray assembly of the present invention; Figure 3 This is a schematic diagram of the structure of the plastic multifaceted hollow sphere of the present invention; Figure 4 This is a schematic diagram of the structure of the PLC closed-loop control box of the present invention; Figure 5 This is a schematic diagram of the pH detector for the alkali storage chamber of the present invention.

[0016] The corresponding reference numerals in the attached diagrams should be: 1. Raw alkali tank; 2. Stirrer; 3. Raw alkali tank level gauge; 4. Inlet valve of the replenishment pump; 5. Check valve of the replenishment pump; 6. Outlet valve of the replenishment pump; 7. Flow meter; 8. Alkali storage chamber; 9. Acid mist inlet check valve; 10. Purified gas outlet detection sensor; 11. Spray assembly; 12. Packing layer; 13. Liquid distribution plate; 14. Low level sensor; 15. High level sensor; 16. Alkali storage. 17. pH meter for cavity, 18. Solenoid valve for drain pipe, 19. Check valve for drain pipe, 20. Waste alkali collection tank, 21. PLC closed-loop control box, 22. PLC controller, 23. Touch screen, 24. Audible and visual alarm, 25. Remote communication module, 26. Diaphragm pump, 27. Circulating pump, 28. Circulating pump inlet valve, 29. Y-type filter, 30. Circulating pump check valve, 31. Circulating pump outlet valve, 32. Level gauge for waste alkali collection tank. Detailed Implementation

[0017] This invention provides an acid-base neutralization acid mist absorber, comprising: a raw alkali tank, wherein a stirrer is installed inside the raw alkali tank; an absorption body, wherein a packing layer is installed inside the absorption body; liquid distribution plates are installed on both the upper and lower ends of the packing layer; the packing layer divides the absorption body into a lower alkali storage chamber and an upper isolation chamber; the raw alkali tank is connected to a diaphragm pump via a replenishment pump check valve; the diaphragm pump, replenishment pump check valve, replenishment pump outlet valve, flow meter, and a first switching valve are connected in series to the alkali storage tank of the absorption body; the absorption body is also provided with an air inlet pipe, a purified outlet pipe, a circulation pipe, and a drain pipe; the drain pipe is located on the lower part of one side of the absorption body and is connected to the alkali storage chamber; the circulation pipe is located above the drain pipe. One end of the circulation pipeline is connected to the alkali storage chamber, and the other end is connected to the isolation chamber. Both the air inlet pipeline and the purification outlet pipeline are located at the upper end of the absorption body, and both are connected to the isolation chamber. The main objective of this invention is to solve the problems in the prior art, such as: existing equipment relies on manual periodic monitoring of alkali concentration, which easily leads to alkali failure due to untimely inspections, reducing acid mist treatment efficiency to below 80%, and even resulting in non-compliant gas emissions; waste alkali discharge and new alkali replenishment require manual operation, which is cumbersome and poses safety hazards such as acid mist leakage and alkali splashing; the alkali storage chamber is prone to the accumulation of reaction precipitates, leading to blockage of the concentration sensor and reduced detection accuracy; the inner wall of the equipment is easily corroded by acids and alkalis, shortening its service life; and the lack of closed-loop control and remote alarm functions results in untimely fault response.

[0018] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" or "having" and any variations thereof are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0019] Example Reference manual attached Figure 1-5 This embodiment provides an acid-base neutralization acid mist absorber, which includes: The original alkali tank 1 contains a stirrer 2 and an absorption body. The absorption body contains a packing layer 12, and liquid distribution plates 13 are provided on both the upper and lower ends of the packing layer. The packing layer divides the absorption body into a lower alkali storage chamber and an upper isolation chamber. The original alkali tank 1 is connected to a diaphragm pump via a replenishment pump inlet valve 4. The diaphragm pump 25, the replenishment pump check valve 5, the replenishment pump outlet valve 6, the flow meter 7, and the first switch valve are connected in series to the alkali storage chamber 8 of the absorption body. The absorption body is also equipped with an air inlet pipe, a purification outlet pipe, a circulation pipe, and a drain pipe. The drain pipe is located on the lower part of one side of the absorption body and is connected to the alkali storage chamber. The circulation pipe is located above the drain pipe, with one end connected to the alkali storage chamber and the other end connected to the isolation chamber. The air inlet pipe and the purification outlet pipe are both located at the upper end of the absorption body and are connected to the isolation chamber.

[0020] A liquid level gauge 3 is installed on one side of the original alkali tank 1 to detect the liquid level in the original alkali tank 1. A low liquid level sensor 14 and a high liquid level sensor 15 are installed on the side wall of the absorption body. A pH meter for the alkali storage chamber is also installed on the side wall of the absorption body. The detection head of the pH meter for the alkali storage chamber is vertically installed inside the alkali storage chamber. The detection head of the pH meter for the alkali storage chamber is covered with a porous stainless steel protective sleeve with a hole diameter of 2-5 mm. A conical guide head is provided at the bottom of the porous stainless steel sleeve. The detection head of the pH meter for the alkali storage chamber maintains a gap of 3-5 mm with the inner wall of the sleeve.

[0021] The air inlet pipeline includes an acid mist inlet check valve 9 and a second switch valve. One end of the acid mist inlet check valve 9 is connected to the acid mist conveying fan, and the other end of the acid mist inlet check valve 9 is connected to the second switch valve. The second switch valve is connected to the alkaline storage chamber of the absorption body.

[0022] A purified gas outlet detection sensor 10 is installed on the purified gas outlet pipeline.

[0023] The circulation pipeline includes a circulation pump inlet valve 27, a Y-type filter 28, a circulation pump 26, a circulation pump check valve 29, a circulation pump outlet valve 30, and a spray assembly 11. The circulation pump inlet valve is connected to the alkaline storage chamber of the absorption body. The circulation pump inlet valve, the Y-type filter, the circulation pump, the circulation pump check valve, and the circulation pump outlet valve are connected in series and then connected to the spray assembly 11. The spray assembly 11 is fixedly installed in the isolation chamber inside the absorption body.

[0024] The drainage pipeline includes a drainage pipe check valve 18, a drainage pipe solenoid valve 17, a waste alkali collection tank 19, and a waste alkali collection tank level gauge 31. One end of the drainage pipe check valve is connected to the alkali storage chamber inside the absorption body, and the other end of the drainage check valve is connected to the drainage pipe solenoid valve. The drainage pipe solenoid valve is connected to the waste alkali collection tank. A waste alkali collection tank level gauge is fixedly installed on the side wall of the waste alkali collection tank. A discharge port is opened on the side wall of the waste alkali collection tank, and a third switch valve is installed on the discharge port.

[0025] The filler layer is filled with multifaceted hollow plastic spheres.

[0026] The inner wall of the alkali storage chamber inside the absorber is coated with FRP anti-corrosion material, and the bottom of the alkali storage chamber has a 5°-10° inclined structure.

[0027] It also includes a PLC closed-loop control box 20, which contains a PLC controller 21, a touch screen 22, an audible and visual alarm 23, and a remote communication module 24. The PLC controller is electrically connected to the touch screen, the audible and visual alarm, and the remote communication module. The PLC controller is also electrically connected to the stirrer, the original alkali tank level gauge, the replenishment pump inlet valve, the replenishment pump check valve, the replenishment pump outlet valve, the flow meter, the acid mist inlet check valve, the purified gas outlet detection sensor, the low level sensor, the high level sensor, the alkali storage chamber pH meter, the drain pipe solenoid valve, the drain pipe check valve, the diaphragm pump, the circulation pump, the circulation pump inlet valve, the circulation pump check valve, the circulation pump outlet valve, the waste alkali collection tank level gauge, the first switch valve, the second switch valve, and the third switch valve through the remote communication module.

[0028] The main body of the absorption unit is made of Q235 carbon steel, and the inner wall is coated with an FRP anti-corrosion coating with a thickness of ≥3mm. The entire absorption unit is cylindrical, with a diameter of 1000-1500mm and a height of 2500-3500mm. The diameter and height of the absorption unit can be flexibly adjusted according to the treatment capacity of 3000-10000m³ / h. A check valve is installed at the top acid mist inlet to prevent gas backflow. A purifier outlet detection sensor is installed at the purified gas outlet to monitor the acidity and alkalinity of the emitted gas in real time. The internal spray assembly uses a ring-shaped 316L stainless steel spray pipe, equipped with 12-18 spiral spray heads, with a spray angle of 120-150° to ensure that the alkali solution uniformly covers the packing layer; the stepped ring packing layer is filled with φ50mm multi-faceted hollow spheres, which are made of PP / PVDF, with a layer height of 800-1200mm and a specific surface area ≥200m² / m³, improving gas-liquid contact efficiency; the liquid distribution plate is a porous grid structure with a pore diameter of 10mm to prevent alkali solution from flowing off course. The bottom of the alkali storage chamber is designed with a 5-10° inclined structure, with a drain outlet at the lowest point. Combined with the drainage pipeline with a slope of more than 3°, it ensures that no waste alkali is discharged. Two submersible liquid level sensors are arranged at the top and bottom of the chamber, namely a low liquid level sensor and a high liquid level sensor. The low liquid level sensor monitors the lowest liquid level L1 (100-150mm from the bottom of the chamber), and the high liquid level sensor monitors the highest liquid level L2 (700-800mm from the bottom of the chamber), so as to achieve precise liquid level control.

[0029] The original alkali solution tank has a volume of 1-3 m³, is made of PP material, and has an inner wall thickness of ≥5 mm. The inner wall is lined with a thick, corrosion-resistant lining to prevent corrosion from 10% sodium hydroxide / sodium carbonate alkali solution. The tank is equipped with a float-type low-level alarm sensor, which triggers a replenishment alarm when the alkali solution level is ≤20%. The agitator includes a 0.75-1.5 kW stirring motor and a 316L stainless steel stirring paddle, controlled by a PLC, stirring for 3-5 minutes every 30-60 minutes to prevent alkali solution sedimentation and stratification, ensuring concentration uniformity (deviation ≤±0.5%). The pipeline is made of PPR material and connects the inlet valve of the replenishment pump, the diaphragm pump, the check valve of the replenishment pump, the outlet valve of the replenishment pump, and the flow meter in series. The flow rate of the diaphragm pump is 2-8 m³ / h and the head is 15-25 m. The replenishment amount is precisely controlled to avoid waste of alkali. The pipeline is connected to the upper part of the alkali storage chamber to prevent impact on the liquid level sensor during replenishment.

[0030] The pH meter for the alkali storage chamber has a measurement range of pH 0-14, a detection accuracy of ±0.01, a response time ≤5s, and is resistant to acid and alkali corrosion. The probe extends into the middle of the alkali storage chamber, 300-500mm from the bottom, placing it in the active alkali circulation area to ensure representative data. The detection head of the alkali storage chamber pH meter is fitted with a porous stainless steel protective sleeve with 2-5mm orifices. A tapered guide head at the bottom guides the alkali flow and prevents sediment accumulation. A 3-5mm gap is maintained between the probe and the inner wall of the sleeve, preventing debris from impacting the probe and ensuring rapid alkali replenishment, completely solving the problems of clogging and detection lag in traditional sensors.

[0031] The drain pipe is made of corrosion-resistant PPR material, with one end connected to the drain port of the storage chamber and the other end connected to a 1-3m³ waste alkali liquid collection tank, which is made of PP material. The drain pipe is tilted at ≥3° throughout, and together with the inclined structure at the bottom of the chamber, it allows the waste alkali liquid to flow by gravity without residue. The drain pipe solenoid valve is installed near the drain port, with a response time ≤0.5s, a nominal pressure of 0.6MPa, and resistance to acid and alkali corrosion. A drain pipe check valve is also connected in series on the drain pipe to prevent the waste alkali liquid from flowing back and contaminating the new alkali liquid. The waste alkali liquid collection tank has a sealed cover on the top, a transparent level gauge (or observation window) on the side, and a discharge port with a manual valve at the bottom for centralized treatment of waste alkali liquid.

[0032] The PLC closed-loop control box uses a Siemens PLC controller, which has high-speed data acquisition and logic operation capabilities. It connects various sensors and actuators through signal lines to form a closed-loop control. It is equipped with a 7-inch color touch screen display, which displays the pH value, liquid level and equipment operating status of the alkali solution in real time, and supports manual parameter adjustment.

[0033] Preset parameters and control logic: Normal operation: The circulation pump starts, the spray assembly works, the acid mist and alkali react in the packing layer, and the alkali is returned and circulated; the pH meter in the alkali storage chamber collects data every 2 seconds, and when the liquid level is lower than L1, the replenishment pump is started to replenish alkali to L2.

[0034] Failure detection and replacement: When the pH value of the alkaline solution in the alkaline solution storage chamber of the acid mist absorber is ≤7 (failure threshold) and confirmed by 3 consecutive tests (with an interval of 5 seconds between each test), the PLC executes the following steps in sequence: shut down the circulation pump → open the electromagnetic drain valve → drain to L1 and close the drain valve → start the replenishment pump → replenish alkali to L2 and shut down the replenishment pump → restart the circulation pump. The entire process is automated and takes ≤5 minutes.

[0035] Abnormal alarm: When the raw alkali solution level is ≤20%, the purified gas pH is ≤6.5, or the equipment malfunctions, the audible and visual alarm (LTE-1101, volume ≥85dB) will activate. Simultaneously, the wireless communication module (which can be a GPRS / 4G module) will send an SMS / APP alarm to the staff's mobile phone (e.g., "Raw alkali solution insufficient, please replenish" or "Purified gas not up to standard, machine shut down"). Optional function: When the purified gas does not meet the standard, the PLC can control the acid mist inlet valve to close to prevent excessive emissions.

[0036] Workflow Pretreatment: Inject 10% sodium hydroxide solution into the original alkali tank, set the parameters (pH threshold, liquid level threshold, stirring cycle) through the touch screen, and start the equipment.

[0037] Initialization and replenishment: The PLC controls the replenishment pump to inject alkali into the alkali storage chamber to L2, and then shuts down the replenishment pump; the circulation pump and acid mist conveying fan are started, and the acid mist enters the absorption body.

[0038] Acid mist purification: The spray assembly sprays alkaline solution, which reacts fully with the acid mist in the packing layer (HCl+NaOH=NaCl+H2O). The purified gas is then emitted after being detected by a gas detection sensor.

[0039] Alkali management: pH sensor monitors concentration in real time, liquid level sensor monitors liquid level, and automatically replenishes alkali when it is below L1; when pH≤7, it automatically executes the drain-replenish process.

[0040] Abnormal handling: If the raw alkali solution is insufficient, the purified gas does not meet the standard, or the equipment malfunctions, the alarm will be activated and the corresponding protection action will be executed (such as stopping the machine or closing the inlet valve).

[0041] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An acid mist absorber for neutralizing acid and alkali solutions, characterized in that, include: The original alkali solution tank includes a stirrer and an absorption body. The absorption body contains a packing layer with liquid distribution plates on both its upper and lower surfaces. The packing layer divides the absorption body into a lower alkali storage chamber and an upper isolation chamber. The original alkali solution tank is connected to a diaphragm pump via a replenishment pump check valve. The diaphragm pump, replenishment pump check valve, replenishment pump outlet valve, flow meter, and first switching valve are connected in series to the alkali storage tank of the absorption body. The absorption body also includes... The unit is equipped with an air inlet pipe, a purified outlet pipe, a circulation pipe, and a drain pipe. The drain pipe is located at the lower part of one side of the absorption body and is connected to the alkali storage chamber. The circulation pipe is located above the drain pipe, with one end connected to the alkali storage chamber and the other end connected to the isolation chamber. The air inlet pipe and the purified outlet pipe are both located at the upper end of the absorption body and are both connected to the isolation chamber.

2. The acid-base neutralization acid mist absorber according to claim 1, characterized in that, A liquid level gauge is installed on one side of the original alkali tank to detect the liquid level height inside the tank. A low-level sensor and a high-level sensor are installed on the side wall of the absorption body. A pH meter for the alkali storage chamber is also installed on the side wall of the absorption body. The detection head of the pH meter is vertically installed inside the alkali storage chamber. A porous stainless steel protective sleeve is fitted over the detection head of the pH meter. The diameter of the holes on the porous stainless steel protective sleeve is 2-5mm. A conical guide head is provided at the bottom of the porous stainless steel sleeve. The detection head of the pH meter maintains a 3-5mm gap with the inner wall of the sleeve.

3. The acid-base neutralization acid mist absorber according to claim 2, characterized in that, The air inlet pipeline includes an acid mist inlet check valve and a second switch valve. One end of the acid mist inlet check valve is connected to the acid mist conveying fan, and the other end of the acid mist inlet check valve is connected to the second switch valve. The second switch valve is connected to the alkaline storage chamber of the absorption body.

4. The acid-base neutralization acid mist absorber according to claim 3, characterized in that, A purified gas outlet detection sensor is installed on the purified outlet pipeline.

5. The acid-base neutralization acid mist absorber according to claim 4, characterized in that, The circulation pipeline includes a circulation pump inlet valve, a Y-type filter, a circulation pump, a circulation pump check valve, a circulation pump outlet valve, and a spray assembly. The circulation pump inlet valve is connected to the alkali storage chamber of the absorption body. The circulation pump inlet valve, the Y-type filter, the circulation pump, the circulation pump check valve, and the circulation pump outlet valve are connected in series and then connected to the spray assembly. The spray assembly is fixedly installed in the isolation chamber inside the absorption body.

6. The acid-base neutralization acid mist absorber according to claim 5, characterized in that, The drainage pipeline includes a drainage pipe check valve, a drainage pipe solenoid valve, a waste alkali collection tank, and a waste alkali collection tank level gauge. One end of the drainage pipe check valve is connected to the alkali storage chamber inside the absorption body, and the other end of the drainage pipe check valve is connected to the drainage pipe solenoid valve. The drainage pipe solenoid valve is connected to the waste alkali collection tank. A waste alkali collection tank level gauge is fixedly installed on the side wall of the waste alkali collection tank. A discharge port is opened on the side wall of the waste alkali collection tank, and a third switch valve is installed on the discharge port.

7. The acid-base neutralization acid mist absorber according to claim 6, characterized in that, The filler layer is filled with plastic multifaceted hollow spheres.

8. The acid-base neutralization acid mist absorber according to claim 7, characterized in that, The inner wall of the alkali storage chamber in the absorption body is coated with FRP anti-corrosion coating, and the bottom of the alkali storage chamber has a 5°-10° inclined structure.

9. The acid-base neutralization acid mist absorber according to claim 8, characterized in that, It also includes a PLC closed-loop control box, which contains a PLC controller, a touch screen, an audible and visual alarm, and a remote communication module. The PLC controller is electrically connected to the touch screen, the audible and visual alarm, and the remote communication module. The PLC controller is also electrically connected to the stirrer, the original alkali tank level gauge, the replenishment pump inlet valve, the replenishment pump check valve, the replenishment pump outlet valve, the flow meter, the acid mist inlet check valve, the purified gas outlet detection sensor, the low level sensor, the high level sensor, the alkali storage chamber pH meter, the drain pipe solenoid valve, the drain pipe check valve, the diaphragm pump, the circulation pump, the circulation pump inlet valve, the circulation pump check valve, the circulation pump outlet valve, the waste alkali collection tank level gauge, the first switch valve, the second switch valve, and the third switch valve via the remote communication module.

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