A device and method for treating high-chlorine waste liquid

Abstract

This application relates to the field of chemical production equipment, and in particular to a high-chlorine-content wastewater treatment device and method. It includes an incinerator for burning the chlorine-containing wastewater and a treatment tower for treating chlorine-containing flue gas. The incinerator and the treatment tower are connected by an inlet pipe for introducing the chlorine-containing flue gas into the treatment tower. A blower is connected to the inlet pipe. An absorption zone is located at the lower end of the treatment tower, and a certain amount of clean water is filled in the absorption zone. One end of the inlet pipe is connected to the clean water in the absorption zone. A partition plate is fixed on the inner wall of the treatment tower above the absorption zone, dividing the absorption zone into independent areas. An exhaust port is provided on the partition plate. A spray assembly is installed inside the treatment tower above the absorption zone, forming a water curtain above the partition plate. The application also relates to a high-chlorine-content wastewater treatment method. This application has the effect of improving the absorption and treatment efficiency of chlorine-containing flue gas.

Description

Technical Field

[0001] This application relates to the field of chemical production equipment, and in particular to a device and method for treating high-chlorine waste liquid. Background Technology

[0002] Currently, high-chlorine-content waste liquids are generated in the industrial production processes of chemicals, electroplating, papermaking, and oils. If these high-chlorine-content waste liquids are discharged directly without treatment, they can easily cause environmental pollution. Incineration is usually used to treat these waste liquids, which will produce a large amount of chlorine-containing flue gas. The main component of chlorine-containing flue gas is HCl. HCl gas is a colorless gas with a strong pungent odor. It is highly corrosive to the environment and equipment, and it irritates human skin and respiratory tract, harming human health.

[0003] Under normal temperature and pressure, 1 volume of water can dissolve 500 volumes of HCl. Based on the principle that HCl gas is readily soluble in water, water absorption is the most economical and convenient way to treat HCl-containing gases. For the treatment of high-HCl-content gases generated from the incineration of high-chlorine waste liquids, direct water absorption of HCl gas is often used. Currently, chlorine-containing flue gas is usually directly treated by water spraying, causing the HCl gas to react with water to obtain hydrochloric acid with a lower concentration. The obtained hydrochloric acid is then collected for further treatment.

[0004] The existing method of treating chlorine-containing flue gas by spraying is easily affected by the amount of water sprayed. When the amount of water sprayed is relatively small, chlorine-containing flue gas that has not had time to react with water will be directly emitted into the air, polluting the environment and causing harm to people if inhaled. When the amount of water sprayed is relatively large, it will cause the water to reach saturation, increasing water consumption and wasting water resources. Summary of the Invention

[0005] In order to improve the absorption and treatment efficiency of chlorine-containing flue gas, this application provides a high-chlorine-content waste liquid treatment device and treatment method.

[0006] In a first aspect, this application provides a high-chlorine-content wastewater treatment device, which adopts the following technical solution:

[0007] A high-chlorine-content wastewater treatment device includes an incinerator for burning chlorine-containing wastewater and a treatment tower for treating chlorine-containing flue gas. The incinerator and the treatment tower are connected by an inlet pipe for introducing chlorine-containing flue gas into the treatment tower. A blower is connected to the inlet pipe. An absorption zone is provided at the lower end of the treatment tower, and a certain amount of clean water is filled in the absorption zone. One end of the inlet pipe is connected to the clean water in the absorption zone. A partition plate is fixed on the inner wall of the treatment tower above the absorption zone, dividing the absorption zone into independent areas. An exhaust port is provided on the partition plate. A spray assembly is provided inside the treatment tower and above the absorption zone, forming a water curtain above the partition plate.

[0008] By adopting the above technical solution, when treating chlorine-containing flue gas generated in the incinerator, the chlorine-containing flue gas can first be introduced into the clean water in the absorption zone, allowing the chlorine-containing flue gas to react fully with the clean water. This neutralizes a large amount of hydrogen chloride gas in the flue gas, producing hydrochloric acid which is retained in the clean water. Flue gas that fails to react in time is discharged from the exhaust port into the area between the spray assembly and the partition plate. Under the action of the spray assembly, the discharged flue gas is sprayed, causing the hydrogen chloride gas in the flue gas to react chemically with the sprayed water. The combination of the clean water in the absorption zone absorbing hydrogen chloride gas and the spray assembly absorbing hydrogen chloride gas forms a two-stage treatment method of primary absorption and secondary absorption, which effectively improves the treatment efficiency of chlorine-containing flue gas and avoids a large waste of water resources.

[0009] Optionally, the spray assembly includes a clean water tank located outside the treatment tower, a main spray pipe installed on the inner wall of the treatment tower, and a connecting pipe connecting the clean water tank and the spray pipe. The main spray pipe has multiple spray holes on its downward-facing pipe wall, and a water pump is connected to the connecting pipe.

[0010] By adopting the above technical solution, the spray assembly installed inside the treatment tower can pump clean water from the clean water tank into the main spray pipe through a water pump during the spraying process, and drip down through the spray holes. During the dripping process, the chlorine-containing flue gas emitted from the absorption zone is absorbed again, and the hydrochloric acid produced can flow back to the absorption zone through the exhaust port. Removing chlorine-containing flue gas by spraying can achieve the purpose of saving water resources.

[0011] Optionally, a pressure regulating device is provided on the partition plate. The pressure regulating device includes a pressure boosting component that controls the increase of pressure inside the absorption zone and a pressure reducing component that controls the decrease of pressure inside the absorption zone. The pressure boosting component includes a pressure boosting ball that controls the opening or closing of the exhaust port. The pressure boosting ball can float at the exhaust port due to the influence of the pressure. The pressure reducing component includes a pressure reducing pipe fixed on the partition plate and communicating with the absorption zone. A pressure reducing cap is slidably fitted at the pipe opening away from the partition plate. The pressure reducing cap controls the opening or closing of the pressure reducing pipe. Whether the pressure reducing cap slides is controlled by the magnitude of the pressure inside the absorption zone. The pressure reducing cap can withstand 1.5-3 atmospheres of pressure. When the pressure inside the absorption zone is greater than the pressure reducing cap can withstand, the pipe opening opens.

[0012] By adopting the above technical solution, when the flue gas inside the incinerator is continuously transported to the absorption zone, gases that cannot react with water and hydrogen chloride gas that cannot react in time gradually accumulate in the absorption zone space, and the pressure inside the absorption zone gradually increases. As the pressure increases, the floating pressure boosting ball seals the exhaust port, and then the pressure inside the absorption zone gradually increases again. Due to the characteristics of hydrogen chloride gas, its efficiency in dissolving in water can be significantly improved under high atmospheric pressure. When the pressure inside the absorption zone reaches the set safe range, the pressure reducing cap automatically opens the pressure reducing pipe, allowing the flue gas inside the absorption zone to be discharged into the area above the partition plate, so that the pressure inside the absorption zone gradually decreases and returns to normal. Through the combined use of the pressure boosting component and the pressure reducing component, the absorption zone can be intermittently kept under high pressure, thereby improving the absorption efficiency of hydrogen chloride gas.

[0013] Optionally, a guide tube is fixed on the partition plate. The guide tube is located inside the absorption zone of the treatment tower. One end of the guide tube is connected to the exhaust port, and the other end of the guide tube extends into the clean water in the absorption zone. The pressurizing ball floats on the water surface inside the guide tube.

[0014] By adopting the above technical solution, the guide tube can play a guiding role, preventing the pressurizing ball from floating to other positions and failing to align with the exhaust port. When the pressure inside the absorption zone gradually increases, the liquid inside the absorption zone will gradually rise along the guide tube, allowing the pressurizing ball to be sealed at the exhaust port under the pressure. When the water level inside the absorption zone is low and much lower than the exhaust port, the gas inside the absorption zone will be discharged from the exhaust port, failing to increase the pressure inside the absorption zone.

[0015] Optionally, the pressure-reducing tube is provided with an elastic element, which connects the pressure-reducing cap to the pressure-reducing tube. When the pressure inside the absorption zone is greater than the maximum pressure that the elastic element can withstand due to elastic deformation, the pressure-reducing cap slides at the opening of the pressure-reducing tube. Multiple pressure-reducing holes are evenly opened on the tube wall of the pressure-reducing tube, and the pressure-reducing cap controls the opening or closing of the pressure-reducing holes.

[0016] By adopting the above technical solution, the elastic element can adapt to the pressure inside the absorption zone. When the pressure inside the absorption zone reaches the set range, the elastic element deforms and drives the pressure reducing cap to move, so that the pressure reducing cap controls the opening of the pressure reducing pipe, releasing excess gas inside the absorption zone into the area above the partition plate, thus regulating the pressure. When the pressure inside the absorption zone gradually decreases, under the action of the elastic element, the pressure reducing cap gradually retracts and resets to the pressure reducing pipe, and re-seals the opening of the pressure reducing pipe, allowing the absorption zone to undergo the next pressurization operation.

[0017] Optionally, the absorption zone inside the processing tower is rotatably equipped with a stirring assembly. The stirring assembly includes a stirring motor installed outside the processing tower, a stirring shaft rotatably connected inside the processing tower, and multiple stirring blades fixed on the stirring shaft. The stirring motor drives the stirring shaft to rotate.

[0018] By adopting the above technical solution, when the pressure inside the absorption zone gradually increases, the stirring motor drives the stirring shaft to rotate, so that the stirring blades can fully stir the water. During the stirring process, the liquid inside the absorption zone can be agitated, allowing the hydrogen chloride gas to react more effectively with the flowing water, thereby increasing the speed at which hydrogen chloride dissolves in the water.

[0019] Optionally, it also includes a PLC controller. A concentration detector is installed on the inner wall of the absorption zone of the treatment tower. The PLC controller is communicatively connected to the concentration detector. A collection box is provided outside the treatment tower. A drain pipe is connected between the collection box and the absorption zone inside the treatment tower. A drain solenoid valve is connected to the drain pipe. The PLC controller is communicatively connected to the drain solenoid valve. The PLC controller is also communicatively connected to the blower.

[0020] By adopting the above technical solution, the concentration detector can monitor the concentration of hydrochloric acid in the water in the absorption zone in real time. When the concentration reaches the set range, the liquid can be discharged into the collection tank as soon as possible, avoiding the need for manual detection. In addition, if the hydrochloric acid concentration in the water in the absorption zone does not reach the standard in time, the flue gas transported to the absorption zone again cannot effectively react with the water, which reduces the efficiency of hydrogen chloride dissolving in water and easily causes a large amount of chlorine-containing flue gas to be discharged from the inside of the treatment tower into the outdoor air.

[0021] Optionally, a water supply pipe connects the clean water tank to the absorption zone inside the treatment tower. A water supply pump and a water supply solenoid valve are connected to the water supply pipe. Both the water supply solenoid valve and the water supply pump are communicatively connected to the PLC controller.

[0022] By adopting the above technical solution, when the hydrochloric acid concentration inside the absorption zone reaches the standard, it can be discharged in a timely manner through the PLC controller, and fresh clean water can be promptly supplied to the absorption zone to facilitate the next treatment of chlorine-containing flue gas. The entire process can be automated, eliminating the need for manual operation and improving work efficiency.

[0023] Secondly, this application provides a method for treating high-chlorine waste liquid, which adopts the following technical solution:

[0024] A method for treating high-chlorine wastewater includes the following steps:

[0025] High-chlorine waste liquid generated in industrial production is fed into an incinerator for incineration;

[0026] The chlorine-containing flue gas produced after incineration is sent into the clean water in the absorption zone of the treatment tower through the flue gas inlet pipe;

[0027] Hydrogen chloride gas in chlorine-containing flue gas reacts with water to produce hydrochloric acid. Excess flue gas and flue gas that does not have time to undergo chemical reaction accumulate in the absorption zone.

[0028] As excess flue gas gradually increases inside the absorption zone, the pressure inside the absorption zone will gradually increase, which will cause the water level inside the guide tube to gradually rise, and enable the pressurizing ball to block the exhaust port.

[0029] After the exhaust port is blocked, the pressure inside the absorption zone increases further. When the pressure is higher than the maximum pressure at which the elastic element undergoes elastic deformation, the pressure reducing cap opens the pressure reducing pipe, allowing the excess chlorine-containing gas inside the absorption zone to be discharged above the partition plate.

[0030] Under the action of the spray assembly, the chlorine-containing flue gas is further treated, so that the hydrogen chloride gas in the chlorine-containing flue gas reacts fully with water, and the hydrochloric acid after the reaction flows into the absorption zone through the exhaust port.

[0031] When the concentration detector detects that the hydrochloric acid concentration in the absorption zone has reached the set value, the drain solenoid valve opens and the blower stops working, allowing the hydrochloric acid inside the absorption zone to flow into the collection tank for storage.

[0032] Once all the hydrochloric acid in the absorption zone has flowed into the collection tank, the water supply solenoid valve and water pump are opened, allowing clean water from the clean water tank to be pumped into the absorption zone for better treatment of chlorine-containing flue gas in the next cycle.

[0033] In summary, this application includes at least one of the following beneficial technical effects:

[0034] 1. The chlorine-containing flue gas treatment device set up in this application conforms to the natural law of flue gas diffusion, and gradually absorbs and treats the flue gas from bottom to top. The lower absorption zone can first treat a large amount of hydrogen chloride gas in the flue gas, and through the pressure regulating device, the internal working environment of the absorption zone can be made higher than one atmosphere, so that the hydrogen chloride gas can quickly dissolve in clean water. After the absorption zone absorbs most of the hydrogen chloride gas, the remaining small amount of hydrogen chloride gas can diffuse into the treatment range of the spray component, and the clean water absorbs the diffused small amount of hydrogen chloride gas in the form of spray. Through the two-stage absorption device, the treatment efficiency of hydrogen chloride gas is improved.

[0035] 2. The special structure of the treatment tower allows hydrogen chloride gas to be absorbed multiple times after entering the tower, resulting in a high hydrochloric acid extraction rate and energy and water saving effects.

[0036] 3. The concentration detector can monitor the concentration of hydrochloric acid in the water in the absorption zone in real time. When the concentration reaches the set range, it can automatically control the discharge of the liquid into the collection tank, avoiding the need for manual detection of the hydrochloric acid concentration in the absorption zone. In addition, if the hydrochloric acid concentration in the water in the absorption zone does not reach the standard in time, the flue gas transported to the absorption zone again cannot effectively react with the water, which reduces the efficiency of hydrogen chloride dissolving in water and easily causes a large amount of chlorine-containing flue gas to be discharged from the inside of the treatment tower into the outdoor air. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0038] Figure 2 This is a cross-sectional view illustrating the internal structure of the processing tower in an embodiment of this application;

[0039] Figure 3 This is a schematic diagram illustrating the pressurization component and the depressurization component in an embodiment of this application.

[0040] Explanation of reference numerals in the attached diagram: 1. Treatment tower; 11. Absorption zone; 12. Separator plate; 121. Exhaust port; 13. Sponge board; 14. Mist catching net; 15. Packing layer; 2. Incinerator; 21. Flue gas inlet pipe; 22. Blower; 23. Bubble generating ring; 24. Ventilation valve; 3. Spray assembly; 31. Main spray pipe; 32. Clean water tank; 33. Connecting pipe; 34. Water pump; 35. Secondary spray pipe; 36. Atomizing nozzle; 4. 1. Pressure boosting assembly; 41. Guide tube; 42. Pressure boosting ball; 43. Water inlet; 5. Pressure reducing assembly; 51. Pressure reducing pipe; 511. Pressure reducing hole; 52. Pressure reducing cap; 53. Pressure reducing spring; 6. Stirring assembly; 61. Stirring shaft; 62. Stirring motor; 63. Stirring blades; 7. Collection box; 71. Drain pipe; 72. Drain solenoid valve; 8. Concentration detector; 9. Water delivery pipe; 91. Water delivery pump; 92. Water delivery solenoid valve. Detailed Implementation

[0041] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0042] This application discloses a device for treating high-chlorine waste liquid.

[0043] Reference Figure 1 and Figure 2 A high-chlorine wastewater treatment device includes a vertically arranged treatment tower 1 and an incinerator 2 located outside the treatment tower 1. The treatment tower 1 has a hollow interior and an open top. The incinerator 2 has a hollow interior and a feed inlet. A heat source is provided inside the incinerator 2 to heat and incinerate the chlorine-containing wastewater added to the incinerator 2. A flue gas inlet pipe 21 is provided between the incinerator 2 and the treatment tower 1. One end of the flue gas inlet pipe 21 connects to the interior of the incinerator 2, and the other end connects to the treatment tower 1. The lower outer wall is connected to the interior of the treatment tower 1, so that the chlorine-containing flue gas generated after incineration can be transported into the treatment tower 1 for treatment. An absorption zone 11 is set up near the lower end of the treatment tower 1 to absorb and treat the chlorine-containing flue gas. A certain amount of clean water is poured into the absorption zone 11. The end of the flue gas inlet pipe 21 away from the incinerator 2 can be connected to the clean water. When the chlorine-containing flue gas is introduced into the clean water, it can react fully with the clean water to produce low-concentration hydrochloric acid, which is convenient for subsequent recycling.

[0044] A blower 22 is connected to the flue gas inlet pipe 21. The chlorine-containing flue gas passing through the blower 22 can be quickly sent into the clean water in the absorption zone 11, generating a large number of bubbles in the clean water. During the bubble generation process, the chlorine-containing flue gas fully reacts with the clean water to produce hydrochloric acid. If the blower 22 is not used, the chlorine-containing flue gas inside the incinerator 2 cannot be delivered to the clean water zone with a certain water pressure, resulting in the chlorine-containing flue gas not being able to react with the clean water. A horizontally set bubble generating ring 23 is fixed at the inlet of the flue gas inlet pipe 21 inside the absorption zone 11. The bubble generating ring 23 has a hollow internal structure and multiple air outlets. The flue gas inlet pipe 21 is connected to the inside of the bubble generating ring 23. When chlorine-containing flue gas enters the inside of the bubble generating ring 23, it can be discharged simultaneously through multiple air outlets, thereby better reacting with clean water. A vent valve 24 is installed at each of the multiple air outlets. The vent valve 24 allows the gas inside the bubble generating ring 23 to be discharged normally, preventing clean water from flowing into the inside of the bubble generating ring 23, thereby preventing clean water from flowing back into the incinerator 2.

[0045] Reference Figure 1 and Figure 2 A partition plate 12 is horizontally installed inside the treatment tower 1 and is fixedly connected to the inner wall of the treatment tower 1. The partition plate 12 is located above the clean water injected into the absorption zone 11. The partition plate 12 divides the absorption zone 11 into independent areas. An exhaust port 121 is provided on the partition plate 12. When the chlorine-containing flue gas in the absorption zone 11 cannot react with the clean water, it can be discharged into the area above the partition plate 12 through the exhaust port 121. A spray assembly 3 is installed inside the treatment tower 1 and above the partition plate 12. The spray assembly 3 can spray water to further react the chlorine-containing flue gas that has not been fully reacted in the absorption zone 11 and prevent the chlorine-containing flue gas from being discharged into the air.

[0046] Reference Figure 1 , Figure 2 and Figure 3A pressure regulating device for increasing the internal pressure of the absorption zone 11 is provided on the partition plate 12. The pressure regulating device includes a pressure boosting component 4 and a pressure reducing component 5 installed on the partition plate 12. The pressure boosting component 4 includes a guide pipe 41 fixed on the partition plate 12 and a pressure boosting ball 42 slidably disposed inside the guide pipe 41. The guide pipe 41 is vertically disposed in the clean water of the absorption zone 11, and the upper end of the guide pipe 41 is aligned and connected with the exhaust port 121. The lower end of the guide pipe 41 extends into the clean water and is connected to the inner wall of the treatment tower 1. The bottom wall is fixedly connected, and multiple water inlet holes 43 are evenly opened on the pipe wall near its lower end of the guide pipe 41. The clean water inside the absorption zone 11 can flow into the guide pipe 41 through the water inlet holes 43. The pressure ball 42 has a hollow internal structure and is made of elastic material. When the clean water inside the absorption zone 11 flows into the guide pipe 41, the pressure ball 42 can float on the water surface. When the chlorine-containing flue gas inside the incinerator 2 is continuously introduced into the clean water, the flue gas that cannot react with the clean water is... Unreacted chlorine-containing flue gas will be stored above the water surface in the absorption zone 11. When the flue gas volume exceeds the storage volume inside the absorption zone 11, chlorine-containing flue gas is continuously introduced, gradually increasing the pressure inside the absorption zone 11. This causes the water level inside the guide pipe 41 to rise. Guided by the guide pipe 41, the booster ball 42 gradually moves towards the exhaust port 121. When the booster ball 42 reaches the exhaust port 121, it seals the exhaust port 121, preventing the flue gas inside the absorption zone 11 from escaping. The gas is discharged through a process that causes the pressure inside the absorption zone 11 to continue to rise. Since hydrogen chloride is a corrosive but non-flammable gas, it does not react with water but is easily soluble in water. In the air, it usually exists in the form of hydrochloric acid mist. At 25°C and 1 atmosphere, 1 volume of water can dissolve about 500 volumes of hydrogen chloride gas. As the gas pressure inside the absorption zone 11 gradually increases, it will increase the reaction efficiency between the chlorine-containing flue gas and the water, and allow 1 volume of water to dissolve a larger volume of chlorine-containing flue gas, resulting in a higher concentration of hydrochloric acid.

[0047] Reference Figure 1 , Figure 2 and Figure 3The pressure-reducing assembly 5 includes a pressure-reducing pipe 51 vertically fixed to the upper surface of the partition plate 12. The pressure-reducing pipe 51 communicates with the interior of the absorption zone 11. A pressure-reducing cap 52 is slidably installed at the upper end of the pressure-reducing pipe 51. The pressure-reducing cap 52 can control the opening or closing of the upper end of the pressure-reducing pipe 51, thereby regulating the pressure inside the absorption zone 11. An elastic element, namely a pressure-reducing spring 53, is installed on the pressure-reducing pipe 51. A vent plate is horizontally fixed inside the pressure-reducing pipe 51. The pressure-reducing spring 53 is vertically installed inside the pressure-reducing pipe 51. The upper end of the pressure-reducing spring 53 is fixed inside the pressure-reducing cap 52, and the lower end of the pressure-reducing spring 53 is fixed to the vent plate. When the pressure inside the absorption zone 11 gradually increases and reaches the designed safe air pressure standard of the absorption zone 11, the pressure inside the absorption zone 11 can push the pressure-reducing cap 52 upward, causing the pressure-reducing cap 52 to slide upward along the pressure-reducing pipe 51 and drive... The pressure-reducing spring 53 deforms, thereby opening the pipe opening at the upper end of the pressure-reducing pipe 51, allowing excess flue gas inside the absorption zone 11 to be discharged from the absorption zone 11. When the pressure inside the absorption zone 11 decreases, the pressure-reducing cap 52 is reset on the pressure-reducing pipe 51 under the action of the pressure-reducing spring 53, allowing chlorine-containing flue gas to be continuously introduced into the absorption zone 11, and the pressure inside the absorption zone 11 to continue to gradually increase. To prevent the pressure-reducing cap 52 from failing to accurately reset after detaching from the upper end of the pressure-reducing pipe 51, multiple pressure-reducing holes 511 are evenly provided on the pipe wall of the pressure-reducing pipe 51 near its upper opening. In the initial state, the pressure-reducing cap 52 controls the pressure-reducing holes 511 to be closed. When the pressure inside the absorption zone 11 increases, the pressure-reducing cap 52 slides upward, causing the pressure-reducing holes 511 to be opened, allowing the gas inside the absorption zone 11 to be discharged from the pressure-reducing holes 511, and preventing the pressure-reducing cap 52 from slipping off the upper end of the pressure-reducing pipe 51.

[0048] Furthermore, as the pressure inside the absorption zone 11 gradually increases, in order to ensure that the pressure-reducing cap 52 can smoothly control the opening of the pressure-reducing hole 511, the maximum pressure that the pressure-reducing spring 53 can withstand during deformation matches the pressure inside the absorption zone 11, so that the pressure-reducing spring 53 can withstand 1.5-3 atmospheres of pressure. When the pressure inside the absorption zone 11 reaches the maximum value of the elastic deformation of the pressure-reducing spring 53, the pressure-reducing spring 53 deforms upward inside the pressure-reducing tube 51, driving the pressure-reducing cap 52 to slide upward and fully open the pressure-reducing hole 511 to adjust the pressure inside the absorption zone 11.

[0049] Reference Figure 1 and Figure 2The spray assembly 3 includes a main spray pipe 31 horizontally fixed to the inner wall of the treatment tower 1. The main spray pipe 31 is an annular pipe. A clean water tank 32 is installed outside the treatment tower 1. A connecting pipe 33 connects the clean water tank 32 and the main spray pipe 31. A water pump 34 is connected to the connecting pipe 33. Under the action of the water pump 34, clean water in the clean water tank 32 can be input into the main spray pipe 31. Inside the annular main spray pipe 31, multiple auxiliary spray pipes 35 are vertically crisscrossed. The multiple auxiliary spray pipes 35 are connected to the main spray pipe 31, and the main spray pipe 31 and the multiple auxiliary spray pipes 35 face the partition plate 12. Multiple water spray holes are provided on the outer pipe wall. The water spray pump 34 can spray the clean water in the clean water tank 32 out of the water spray holes. When the excess flue gas inside the absorption zone 11 is discharged, the clean water sprayed by the spray assembly 3 can spray the excess flue gas to treat it. This allows the excess hydrogen chloride in the flue gas to react with the clean water and produce hydrochloric acid. The hydrochloric acid produced can fall onto the partition plate 12 and flow into the absorption zone 11 from the exhaust port 121. The spray assembly 3 can play a secondary absorption role, preventing the hydrogen chloride gas that cannot react in time inside the absorption zone 11 from being directly discharged into the atmosphere and polluting the environment.

[0050] Furthermore, atomizing nozzles 36 are installed at the locations of the water spray holes. These nozzles atomize the sprayed water into a mist, forming a water curtain inside the treatment tower 1. When excess chlorinated flue gas passes through this water curtain, it reacts chemically with the clean water, absorbing all the hydrogen chloride from the excess flue gas. A circular sponge plate 13 is placed between the partition plate 12 and the spray assembly 3. The sponge plate 13 is fixedly fitted to the inner wall of the treatment tower 1, forming a sandwich layer between the partition plate 12 and the spray assembly 3. When the water mist sprayed by the atomizing nozzles 36 is excessive, the sponge plate 13 absorbs it, preventing water waste. Additionally, when the sponge plate 13 absorbs excess water, it forms a suspended clean water layer above the partition plate 12. When the chlorinated flue gas inside the absorption zone 11 is discharged upwards, it first reacts chemically with the clean water in the sponge plate 13, neutralizing a portion of the hydrogen chloride gas. The excess gas then reacts with the atomizing nozzles. The water sprayed from the 36th stage reacts with the excess hydrochloric acid neutralized by the sponge plate 13, dripping onto the partition plate 12 and eventually flowing into the absorption zone 11. A mist-catching net 14 is installed inside the treatment tower 1 near the upper tower opening. The net has fine mesh. Since the flue gas passing through the spray assembly 3 contains a large amount of moisture, the moisture accumulates on the net after passing through it. Excess moisture forms droplets, which further purify the unpurified flue gas as they drip downwards, achieving water reuse. Excess water also flows back into the absorption zone 11. A packing layer 15 is fixed inside the treatment tower 1 above the mist-catching net 14. This packing layer 15 uses a two-stage alkaline absorption tower design, capable of absorbing sulfur dioxide, sulfur trioxide, and residual hydrogen chloride gas in the flue gas, ensuring compliance with emission standards.

[0051] Reference Figure 1 and Figure 2 A stirring assembly 6 is installed in the absorption zone 11 inside the treatment tower 1. The stirring assembly 6 includes a stirring shaft 61 rotatably disposed in the clean water of the absorption zone 11. The stirring shaft 61 rotates horizontally in the absorption zone 11, with one end of the stirring shaft 61 extending out of the treatment tower 1. A stirring motor 62 is fixed on the outer wall of the treatment tower 1. The output shaft of the stirring motor 62 is fixed to the end of the stirring shaft 61 and drives the stirring shaft 61 to rotate. Multiple stirring blades 63 are fixedly connected to the stirring shaft 61 inside the treatment tower 1. The multiple stirring blades 63 are evenly distributed along the length and circumference of the stirring shaft 61. When the pressure inside the absorption zone 11 gradually increases, the stirring motor 62 drives the stirring shaft 61 to rotate, so that the stirring blades 63 can fully stir the clean water. During the stirring process, the chemical reaction between hydrogen chloride gas and clean water can be improved, and the speed at which hydrogen chloride dissolves in clean water can be increased.

[0052] A low-concentration hydrochloric acid collection tank 7 is installed outside the treatment tower 1. A drain pipe 71 connects the collection tank 7 and the absorption zone 11 inside the treatment tower 1, and a drain solenoid valve 72 is connected to the drain pipe 71. A high-chlorine wastewater treatment device also includes a PLC controller installed on the treatment tower 1. A concentration detector 8 is installed on the inner wall of the treatment tower 1 located in the absorption zone 11. The PLC controller is communicatively connected to the concentration detector 8 and to the drain solenoid valve 72. The water can submerge the concentration detector 8. As the concentration of hydrochloric acid in the water gradually increases... Once the concentration reaches the value set by the concentration sensor, the concentration detector 8 transmits a signal to the PLC controller, which then controls the drain solenoid valve 72 to open, allowing the hydrochloric acid liquid inside the absorption zone 11 to flow into the collection tank 7 for storage, in order to proceed with the next purification operation. The PLC controller is also electrically connected to the blower 22. When the PLC controller controls the drain solenoid valve 72 to open, the PLC controller can control the blower 22 to close, preventing the chlorine-containing flue gas inside the incinerator 2 from being sent into the absorption zone 11 without clean water to react with it.

[0053] Reference Figure 1 and Figure 2 A water supply pipe 9 is connected between the clear water tank 32 and the absorption zone 11 of the treatment tower 1. A water supply pump 91 and a water supply solenoid valve 92 are connected to the water supply pipe 9. The water supply pump 91 can pump the clear water in the clear water tank 32 to the absorption zone 11. The PLC controller is connected to the water supply pump 91 and the water supply solenoid valve 92 respectively. After the hydrochloric acid liquid inside the absorption zone 11 is discharged, the PLC controller can control the opening of the water supply pump 91 and the water supply solenoid valve 92 so that the clear water in the clear water tank 32 can be sent into the absorption zone 11 so that the chlorine-containing flue gas in the incinerator 2 can continue to carry out chemical reaction.

[0054] This application also discloses a method for treating high-chlorine waste liquid.

[0055] Reference Figure 1 , Figure 2 and Figure 3 A method for treating high-chlorine wastewater includes the following steps:

[0056] S1: High-chlorine waste liquid generated in industrial production is added to incinerator 2. An ignition source is set in incinerator 2 to burn the waste liquid added to incinerator 2. During the incineration process, the high-chlorine waste liquid will produce a large amount of flue gas. The main chlorine gas in the flue gas is hydrogen chloride. Hydrogen chloride is a colorless gas with a strong pungent odor. It is highly corrosive to the environment and equipment, and it irritates human skin and respiratory tract, harming human health.

[0057] S2: The hydrogen chloride gas after incineration can enter the absorption zone 11 of the treatment tower 1 through the flue pipe 21. The blower 22 on the flue pipe 21 can quickly send the chlorine-containing gas after incineration into the treatment tower 1, so as to avoid the chlorine-containing flue gas accumulating inside the incinerator 2 and affecting the normal combustion of other high-chlorine waste liquids. Before the chemical reaction of the chlorine-containing flue gas begins, the clean water in the clean water tank 32 is transported to the absorption zone 11 in advance through the water pump 91. The chlorine-containing flue gas in the incinerator 2 can be introduced into the clean water, generating a large number of bubbles and reacting chemically with the clean water.

[0058] S3: During the reaction of chlorine-containing flue gas with water, a low concentration of hydrochloric acid is produced and retained in the water. Since the flue gas after incineration contains not only hydrogen chloride gas, but also gases such as CO2, CO, NO, NO2, SO2, and SO3, the gases that react with water are neutralized by the reaction. The gases that cannot react with water, as well as the gases that will react with water in the future, can float on the water surface of the absorption zone 11.

[0059] S4: As the volume of unreacted gas inside the absorption zone 11 gradually increases, and the blower 22 gradually supplies smoke into the absorption zone 11, the pressure inside the absorption zone 11 gradually increases and gradually exceeds the pressure of the clean water itself. This causes the water level inside the guide pipe 41 to gradually rise and drive the booster ball 42 to move upward. When the booster ball 42 contacts the exhaust port 121, it will seal the exhaust port 121 under the action of water pressure, preventing the liquid inside the absorption zone 11 from being discharged upward from the exhaust port 121.

[0060] S5: After the exhaust port 121 is sealed, and the blower 22 continues to deliver chlorine-containing flue gas, the pressure inside the absorption zone 11 further increases. When the pressure inside the absorption zone 11 gradually increases to a level greater than the maximum pressure at which the pressure-reducing spring 53 can undergo elastic deformation, the pressure inside the absorption zone 11 drives the pressure-reducing spring 53 to deform inside the pressure-reducing pipe 51 and causes the pressure-reducing cap 52 to slide upward. When the pressure-reducing cap 52 slides upward and opens the orifice of the pressure-reducing hole 511, the excess gas inside the absorption zone 11 can be quickly discharged from the pressure-reducing hole 511, causing the pressure inside the absorption zone 11 to gradually decrease. Under the elastic force of the pressure-reducing spring 53, the pressure-reducing cap 52 is pulled downward to return to its original position and controls the closure of the orifice of the pressure-reducing hole 511. When the blower 22 delivers flue gas, the pressure inside the absorption zone 11 can continue to gradually increase.

[0061] S6: The flue gas discharged between the spray assembly 3 and the partition plate 12, under the action of the water pump 34, the clean water inside the clean water tank 32 can be sprayed downward through the atomizing nozzle 36. The water mist sprayed by the atomizing nozzle 36 can better react with the flue gas. The hydrochloric acid produced after the reaction can fall onto the partition plate 12 and flow into the absorption zone 11 through the exhaust port 121.

[0062] S7: After the pressure regulating device performs multiple pressurization and depressurization operations inside the absorption zone 11, the hydrochloric acid content in the clean water inside the absorption zone 11 gradually increases. When the concentration detector 8 detects that the hydrochloric acid concentration in the absorption zone 11 has reached its set value, the PLC controller first controls the blower 22 to stop working to prevent the flue gas inside the incinerator 2 from continuing to be transported into the absorption zone 11. Then, the PLC controller controls the drain solenoid valve 72 to open, so that all the liquid inside the absorption zone 11 can flow into the collection box 7 for storage, recycling and reuse.

[0063] S8: When the liquid inside the absorption zone 11 flows into the collection tank 7, the PLC controller controls the water supply solenoid valve 92 and the water supply pump 91 to open in sequence, so that the clean water inside the clean water tank 32 can be pumped into the absorption zone 11. After the clean water inside the absorption zone 11 is filled, the PLC controller controls the blower 22 to continue to open, so that the clean water inside the absorption zone 11 can carry out the next chemical reaction and treat the hydrogen chloride gas in the flue gas. When the concentration sensor detects that the hydrochloric acid concentration inside the absorption zone 11 has reached the set value range again, the liquid inside the absorption zone 11 is discharged and clean water is filled again. This cycle is repeated to complete the gas recovery treatment of the high chlorine waste liquid.

[0064] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-chlorine-containing waste liquid treatment device characterized by comprising: The system includes an incinerator (2) for burning chlorine-containing waste liquid and a treatment tower (1) for treating chlorine-containing flue gas. The incinerator (2) and the treatment tower (1) are connected by a flue gas inlet pipe (21) for introducing chlorine-containing flue gas into the treatment tower (1). A blower (22) is connected to the flue gas inlet pipe (21). An absorption zone (11) is provided at the lower end of the treatment tower (1). A certain amount of clean water is filled into the absorption zone (11). The flue gas inlet pipe (21) is connected to the treatment tower (1). One end is connected to the clean water inside the absorption zone (11). A partition plate (12) is fixed on the inner wall of the treatment tower (1) located above the absorption zone (11). The partition plate (12) divides the absorption zone (11) into independent areas. An exhaust port (121) is provided on the partition plate (12). A spray assembly (3) is provided inside the treatment tower (1) and above the absorption zone (11). The spray assembly (3) forms a water curtain above the partition plate (12). The spray assembly (3) includes a clean water tank (32) located outside the treatment tower (1), a main spray pipe (31) installed on the inner wall of the treatment tower (1), and a connecting pipe (33) connecting the clean water tank (32) and the spray pipe. The main spray pipe (31) has multiple spray holes on its downward-facing pipe wall, and a water pump (34) is connected to the connecting pipe (33). A pressure regulating device is provided on the partition plate (12). The pressure regulating device includes a pressure boosting component (4) for controlling the increase of pressure inside the absorption zone (11) and a pressure reducing component (5) for controlling the decrease of pressure inside the absorption zone (11). The pressure boosting component (4) includes a pressure boosting ball (42) for controlling the opening or closing of the exhaust port (121). The pressure boosting ball (42) is floating and positioned at the exhaust port (121) depending on the pressure. The pressure reducing component (5) includes components fixed on the partition plate (12) and connected to the absorption zone (11). 1) A pressure-reducing pipe (51) is connected. A pressure-reducing cap (52) is slidably fitted at the opening of the pressure-reducing pipe (51) away from the partition plate (12). The pressure-reducing cap (52) controls the opening or closing of the opening of the pressure-reducing pipe (51). Whether the pressure-reducing cap (52) slides is controlled by the magnitude of the pressure inside the absorption zone (11). The pressure-reducing cap (52) can withstand 1.5-3 atmospheres. When the pressure inside the absorption zone (11) is greater than the atmospheric pressure that the pressure-reducing cap (52) can withstand, the opening of the pressure-reducing pipe (51) opens. A guide tube (41) is fixed on the partition plate (12). The guide tube (41) is located inside the absorption zone (11) of the treatment tower (1). One end of the guide tube (41) is connected to the exhaust port (121), and the other end of the guide tube (41) extends into the clean water in the absorption zone (11). The pressure boosting ball (42) floats on the water surface inside the guide tube (41). An elastic element is provided on the pressure reducing pipe (51). The elastic element connects the pressure reducing cap (52) to the pressure reducing pipe (51). When the pressure inside the absorption zone (11) is greater than the maximum pressure that the elastic element can withstand due to elastic deformation, the pressure reducing cap (52) slides at the opening of the pressure reducing pipe (51). Multiple pressure reducing holes (511) are evenly opened on the pipe wall of the pressure reducing pipe (51). The pressure reducing cap (52) controls the opening or closing of the pressure reducing holes (511). It also includes a PLC controller. A concentration detector (8) is installed on the inner wall of the absorption zone (11) of the treatment tower (1). The PLC controller is communicatively connected to the concentration detector (8). A collection box (7) is set outside the treatment tower (1). A drain pipe (71) is connected between the collection box (7) and the absorption zone (11) inside the treatment tower (1). A drain solenoid valve (72) is connected to the drain pipe (71). The PLC controller is communicatively connected to the drain solenoid valve (72). The PLC controller is also communicatively connected to the blower (22). A water supply pipe (9) is connected between the clear water tank (32) and the absorption zone (11) inside the treatment tower (1). A water supply pump (91) and a water supply solenoid valve (92) are connected to the water supply pipe (9). Both the water supply solenoid valve (92) and the water supply pump (91) are communicatively connected to the PLC controller.

2. The high-chlorine wastewater treatment device according to claim 1, characterized in that: The absorption zone (11) inside the processing tower (1) is rotatably equipped with a stirring assembly (6). The stirring assembly (6) includes a stirring motor (62) installed outside the processing tower (1), a stirring shaft (61) rotatably connected inside the processing tower (1), and multiple stirring blades (63) fixed on the stirring shaft (61). The stirring motor (62) drives the stirring shaft (61) to rotate.

3. A method for treating high-chlorine wastewater, employing a high-chlorine wastewater treatment device as described in any one of claims 1-2, characterized in that: Includes the following steps: The high-chlorine waste liquid generated in industrial production is fed into the incinerator (2) for incineration; The chlorine-containing flue gas produced after incineration is sent into the clean water in the absorption zone (11) of the treatment tower (1) through the flue gas inlet pipe (21); Hydrogen chloride gas in chlorine-containing flue gas reacts with water to produce hydrochloric acid. Excess flue gas and flue gas that does not have time to undergo chemical reaction accumulate in the absorption zone (11). As the excess flue gas inside the absorption zone (11) gradually increases, the pressure inside the absorption zone (11) will gradually increase, which will cause the water level inside the guide pipe (41) to gradually rise, and enable the pressurizing ball (42) to block the exhaust port (121). After the exhaust port (121) is blocked, the pressure inside the absorption zone (11) increases further. When the pressure is higher than the maximum pressure at which the elastic element undergoes elastic deformation, the pressure relief cap (52) opens the opening of the pressure relief pipe (51), allowing the excess chlorine-containing gas inside the absorption zone (11) to be discharged into the spacer plate (12). Under the action of the spray assembly (3), the chlorine-containing flue gas is further treated so that the hydrogen chloride gas in the chlorine-containing flue gas reacts fully with water, and the hydrochloric acid after the reaction flows into the absorption zone (11) through the exhaust port (121). When the concentration detector (8) detects that the hydrochloric acid concentration in the absorption zone (11) has reached the set value, the drain solenoid valve (72) opens and the blower (22) stops working, so that the hydrochloric acid inside the absorption zone (11) flows into the collection tank (7) for storage. When all the hydrochloric acid inside the absorption zone (11) flows into the collection tank (7), the water supply solenoid valve (92) and the water supply pump (91) are opened, and the clean water inside the clean water tank (32) can be pumped into the absorption zone (11) so as to better treat the chlorine-containing flue gas next time.

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