Exhaust gas and waste liquid treatment device and method

Abstract

The present application relates to a kind of waste gas waste liquid collaborative treatment device, waste gas waste liquid mixture enters collection tower from the first feed port, waste liquid flows downward under the action of gravity, waste gas moves upward, wherein waste liquid flows through the water outlet, drain pipe, evaporative tank, condenser and is converted into reclaimed water into water storage tank, part of reclaimed water passes through the water pump and three-way valve and enters spray pipe, and then is sprayed out by the spray head and contacted with the upward moving waste gas.The purpose is to solve the problem that a large amount of fresh water resources is continuously consumed during the operation of the existing spray tower, and harmful substances absorbed from the waste gas are enriched in the washing waste liquid formed after use.

Description

Technical Field

[0001] This invention relates to the field of environmental protection technology, specifically to a device and method for the co-treatment of waste gas and waste liquid. Background Technology

[0002] In industries such as chemical, pharmaceutical, printing and dyeing, spraying, and electronics manufacturing, the production process often generates waste gases containing volatile organic compounds and toxic and harmful components, as well as waste liquids with high concentrations, high salinity, or those that are difficult to biodegrade. If these waste gases and waste liquids are discharged directly without proper treatment, they will cause serious harm to the ecological environment and human health.

[0003] Currently, traditional treatment equipment for this type of waste gas and waste liquid mainly employs two independent units: First, spray towers for waste gas purification. These towers typically use a large amount of fresh water as the washing liquid, absorbing pollutants from the waste gas through gas-liquid contact, thereby purifying the waste gas. Second, low-temperature evaporation wastewater treatment equipment for waste liquid reduction or regeneration. This equipment lowers the boiling point of water by reducing the internal pressure, causing the wastewater to boil and evaporate at a lower temperature (typically 30-60℃), thus separating pollutants from the water.

[0004] However, the spray tower needs to continuously consume a large amount of fresh water during operation, and the washing waste liquid formed after use is enriched with harmful substances absorbed from the exhaust gas. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a waste gas and waste liquid co-treatment device and method to solve the problem that in the prior art, the spray tower needs to continuously consume a large amount of fresh water resources during operation, and the washing waste liquid formed after use is enriched with harmful substances absorbed from the waste gas.

[0006] This invention is achieved through the following technical solution: A waste gas and waste liquid co-treatment device includes a collection tower. The collection tower has an air outlet, a first feed inlet and a water outlet arranged sequentially from top to bottom along its height direction. A packing assembly is installed inside the collection tower. A spray pipe is installed above the packing assembly. One end of the spray pipe is connected to a nozzle inside the collection tower. The outlet is connected to a drain pipe, and the end of the drain pipe away from the outlet is connected to an evaporator. A heating element is installed inside the evaporator. The output end of the evaporator is connected to a condenser. A vacuum pump is connected to the condenser. The output end of the condenser is connected to a water storage tank. A water pump is connected inside the water storage tank. The output end of the water pump is connected to a three-way valve. The two output ends of the three-way valve are connected to the outside and the spray pipe, respectively. After the waste gas and waste liquid mixture enters the collection tower through the first feed inlet, the waste liquid flows downward under the action of gravity, while the waste gas moves upward. The waste liquid flows through the outlet, drain pipe, evaporator, and condenser and is transformed into regenerated water that enters the water storage tank. Part of the regenerated water enters the spray pipe through the water pump and three-way valve, and then is sprayed out through the nozzle to contact the upward-moving waste gas.

[0007] Furthermore, an exhaust pipe is connected to the air outlet, an exhaust fan is connected to the output end of the exhaust pipe, a gas supply pipe is connected to the output end of the exhaust fan, a condenser coil is installed inside the condenser, and the end of the gas supply pipe away from the exhaust fan is connected to the input end of the condenser coil. The exhaust gas moves upward and is filtered by the packing assembly, transforming into compliant emission gas. Under the action of the exhaust fan, the compliant emission gas flows through the exhaust pipe and the gas delivery pipe and enters the condenser coil, thereby providing auxiliary cooling to the inside of the condenser.

[0008] Furthermore, a gas cooler is connected between the exhaust fan and the gas supply pipe, and a three-way pipe is connected between the exhaust pipe and the exhaust fan. The three-way pipe has two input ends and one output end. The output end of the three-way pipe is connected to the input end of the exhaust fan, and the two input ends of the three-way pipe are respectively connected to the outside and the exhaust pipe. A regulating valve is installed inside the three-way pipe. Once stable, compliant emission gas is generated, the regulating valve is adjusted to connect the exhaust pipe to the input end of the exhaust fan. The compliant emission gas enters the gas cooler through the exhaust fan for cooling, and then enters the condenser coil through the gas delivery pipe to cool the inside of the condenser.

[0009] Furthermore, the heating assembly includes a gas electric heater, the input end and the output end of which are respectively connected to a first connecting pipe and a second connecting pipe. The end of the first connecting pipe away from the gas electric heater is connected to the output end of the condensing coil, and the end of the second connecting pipe away from the gas electric heater is connected to a heating coil. The heating coil is located inside the evaporator, and the output end of the heating coil extends upward through the side wall of the evaporator. After the qualified emission gas is discharged from the output end of the condenser coil, it enters the gas electric heater through the first connecting pipe for heating, and then is transported to the heating coil through the second connecting pipe to heat the evaporator. Finally, the qualified emission gas is discharged to the outside from the output end of the heating coil.

[0010] Furthermore, the packing assembly includes a support frame that slides within the collection tower, and a plurality of hollow spherical packings are placed within the support frame.

[0011] A guide rod is fixedly connected inside the collection tower. The guide rod extends upward along the central axis of the collection tower. Both ends of the guide rod can be detachably connected to limit blocks. The support frame is provided with a sliding groove that matches the guide rod.

[0012] When the pressure of the exhaust gas below the support frame is greater than a set value, it causes the support frame to move upward until it abuts against the limiting block at the upper end of the guide rod, thereby causing multiple hollow ball packings inside the support frame to move. When the pressure of the exhaust gas below the support frame is less than a set value, the support frame falls back to abut against the limiting block at the lower end of the guide rod under the action of gravity.

[0013] Furthermore, a demister is detachably installed inside the collection tower, and the demister is located between the support frame and the air outlet. When the compliant emission gas passes through the demister, the demister intercepts the water vapor in the compliant emission gas.

[0014] Furthermore, the collecting tower is provided with a second feed inlet, which is located above the first feed inlet. A guide plate is fixedly connected to the second feed inlet, which is inclined downwards and located directly above the first feed inlet. The second feed inlet is used specifically for discharging waste liquid. Under the action of the guide plate, the waste liquid falls in a water curtain shape and blocks the upward movement of exhaust gas. During the falling process, the waste liquid comes into contact with the exhaust gas.

[0015] Furthermore, the diameter of the lower end of the evaporator gradually decreases downward, and a through hole is provided at the lower end of the evaporator. A waste discharge pipe is connected to the through hole, and a valve is installed at the pipe opening of the waste discharge pipe away from the evaporator. When the valve is closed, the concentrated liquid remaining after evaporation settles and is stored at the bottom of the evaporation tank under gravity. When the valve is opened, the concentrated liquid flows through the waste discharge pipe and is discharged.

[0016] A method for co-treating waste gas and waste liquid includes a waste gas and waste liquid co-treating device. S1: The waste gas and waste liquid mixture enters the collection tower through the first feed inlet, wherein the waste liquid flows downward and flows through the outlet and drain pipe in sequence before entering the evaporator. S2: The regulating valve connects the outside air to the input of the exhaust fan. The outside air flows through the gas supply pipe, condenser coil and first connecting pipe into the gas electric heater. The gas electric heater is started and enters the heating coil through the second connecting pipe to heat the waste liquid in the evaporator, so that the waste liquid evaporates into water vapor. The water vapor enters the condenser and is condensed into regenerated water. The regenerated water enters the water storage tank. S3: Start the water pump to extract the reclaimed water from the water storage tank, and deliver part of the reclaimed water to the spray pipe through the three-way valve. The reclaimed water is sprayed out through the nozzle and sprayed above the packing assembly. S4: After the exhaust gas enters the collection tower, it moves upward and comes into contact with the sprayed regenerated water at the packing assembly to achieve exhaust gas washing.

[0017] Furthermore, it also includes: S5: The qualified emission gas after being filtered by the packing assembly flows through the air outlet and exhaust pipe. When a stable qualified emission gas is generated, the exhaust pipe is connected to the input end of the exhaust fan through the regulating valve. The emission gas is transported to the gas transmission pipe under the action of the exhaust fan, and then introduced into the condensing coil in the condenser to cool the inside of the condenser and assist the condensation process of water vapor. S6: After the qualified emission gas is discharged from the condenser coil, it flows through the first connecting pipe into the gas electric heater for heating. After heating, the qualified emission gas enters the heating coil through the second connecting pipe to heat the waste liquid in the evaporator, and is discharged from the output end of the heating coil.

[0018] The beneficial effects of this invention are as follows: This invention relates to a co-treatment device and method for waste gas and waste liquid. The waste gas and waste liquid mixture enters a collection tower through a first inlet. The waste liquid flows downwards under gravity and then flows through an outlet and drain pipe into an evaporator. Inside the evaporator, a gas electric heater and heating coil heat the waste liquid, while a vacuum pump reduces the pressure inside the tank, causing the waste liquid to boil and evaporate into water vapor at a lower temperature (30-60℃). The water vapor rises and enters a condenser, where it is cooled and condensed into reclaimed water, stored in a water tank. Part of the reclaimed water in the tank is pumped back to the spray pipe via a three-way valve and sprayed out through nozzles to contact the rising waste gas, further absorbing residual pollutants and achieving self-recycling of the spray water to replace fresh water resources, significantly reducing the need for external water replenishment. This is particularly suitable for water-scarce areas or water-intensive industries. The other part of the reclaimed water can be discharged or reused.

[0019] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ; Figure 3 This is a partial structural diagram of the present invention; Figure 4 For the present invention Figure 3 A magnified view of a section at point A in the middle; Figure 5 For the present invention Figure 3 A magnified view of a section at point B in the middle; Figure 6 This is a schematic diagram showing the connection between the limiting block and the support frame in this invention.

[0021] In the diagram: 1. Collection tower; 2. Air outlet; 3. First feed inlet; 4. Water outlet; 5. Packing assembly; 6. Spray pipe; 7. Nozzle; 8. Drain pipe; 9. Evaporator; 10. Heating assembly; 11. Condenser; 12. Vacuum pump; 13. Water storage tank; 14. Water pump; 15. Three-way valve; 16. Exhaust pipe; 17. Exhaust fan; 18. Gas transmission pipe; 19. Condensation coil; 20. Gas cooler; 21. Three-way pipe; 22. Regulating valve; 23. Gas electric heater; 24. First connecting pipe; 25. Second connecting pipe; 26. Heating coil; 27. Support frame; 28. Hollow ball packing; 29. ​​Guide rod; 30. Limiting block; 31. Slide groove; 32. Demister; 33. Second feed inlet; 34. Baffle plate; 35. Through hole; 36. Waste discharge pipe; 37. Valve. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the above description of the present invention, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0027] Please see Figures 1 to 6 The present invention provides a technical solution: a waste gas and waste liquid co-treatment device, including a collection tower 1, wherein an air outlet 2, a first feed inlet 3 and a water outlet 4 are arranged sequentially from top to bottom along the height direction of the collection tower 1, a packing assembly 5 is installed inside the collection tower 1, and a spray pipe 6 is installed above the packing assembly 5, and one end of the spray pipe 6 located inside the collection tower 1 is connected to a nozzle 7. The outlet 4 is connected to a drain pipe 8. The end of the drain pipe 8 away from the outlet 4 is connected to an evaporator 9. A heating element 10 is installed inside the evaporator 9. The output end of the evaporator 9 is connected to a condenser 11. A vacuum pump 12 is connected to the condenser 11. The output end of the condenser 11 is connected to a water storage tank 13. A water pump 14 is connected inside the water storage tank 13. The output end of the water pump 14 is connected to a three-way valve 15. The two output ends of the three-way valve 15 are connected to the outside and the spray pipe 6, respectively. After the waste gas and waste liquid mixture enters the collection tower 1 through the first feed inlet 3, the waste liquid flows downward under the action of gravity, while the waste gas moves upward. The waste liquid flows through the outlet 4, drain pipe 8, evaporator 9, and condenser 11 and is transformed into regenerated water, which enters the water storage tank 13. Part of the regenerated water enters the spray pipe 6 through the water pump 14 and three-way valve 15, and is then sprayed out through the nozzle 7 to contact the upward-moving waste gas.

[0028] An exhaust pipe 16 is connected to the air outlet 2. An exhaust fan 17 is connected to the output end of the exhaust pipe 16. An air supply pipe 18 is connected to the output end of the exhaust fan 17. A condenser coil 19 is installed inside the condenser 11. The end of the air supply pipe 18 away from the exhaust fan 17 is connected to the input end of the condenser coil 19. The exhaust gas moves upward and is filtered by the packing assembly 5, transforming into compliant emission gas (compliant emission gas refers to gas that meets national or local air pollutant emission standards after treatment). Under the action of the exhaust fan 17, the compliant emission gas flows through the exhaust pipe 16 and the gas transmission pipe 18 and enters the condenser coil 19, thereby providing auxiliary cooling to the interior of the condenser 11.

[0029] A gas cooler 20 is connected between the exhaust fan 17 and the gas supply pipe 18. A three-way pipe 21 is connected between the exhaust pipe 16 and the exhaust fan 17. The three-way pipe 21 has two input ends and one output end. The output end of the three-way pipe 21 is connected to the input end of the exhaust fan 17. The two input ends of the three-way pipe 21 are connected to the outside and the exhaust pipe 16, respectively. A regulating valve 22 is installed inside the three-way pipe 21. Once stable, compliant emission gas is generated, the regulating valve 22 is adjusted to connect the exhaust pipe 16 to the input end of the exhaust fan 17. The compliant emission gas enters the gas cooler 20 through the exhaust fan 17 for cooling, and then enters the condenser coil 19 through the gas delivery pipe 18 to cool the inside of the condenser 11.

[0030] The heating assembly 10 includes a gas electric heater 23. The input end and the output end of the gas electric heater 23 are respectively connected to a first connecting pipe 24 and a second connecting pipe 25. The end of the first connecting pipe 24 away from the gas electric heater 23 is connected to the output end of the condensing coil 19. The end of the second connecting pipe 25 away from the gas electric heater 23 is connected to a heating coil 26. The heating coil 26 is located inside the evaporator 9. The output end of the heating coil 26 extends upward through the side wall of the evaporator 9. After the qualified emission gas is discharged from the output end of the condenser coil 19, it enters the gas electric heater 23 through the first connecting pipe 24 for heating, and then is transported to the heating coil 26 through the second connecting pipe 25 to heat the evaporator 9. Finally, the qualified emission gas is discharged to the outside from the output end of the heating coil 26.

[0031] In this scheme: the waste gas and waste liquid mixture enters the collection tower 1 through the first feed inlet 3. The waste liquid flows downward under gravity and enters the evaporator 9 through the outlet 4 and drain pipe 8. Inside the evaporator 9, the waste liquid is heated by a gas electric heater 23 and a heating coil 26. At the same time, the pressure inside the tank is reduced by the vacuum pump 12, causing the waste liquid to boil and evaporate into water vapor at a lower temperature (30-60℃). The water vapor moves upward and enters the condenser 11, where it is cooled and condensed into reclaimed water by the condensing coil 19 and stored in the water storage tank 13. The reclaimed water in the water storage tank 13 is sent back to the spray pipe 6 through the water pump 14 and the three-way valve 15. Part of the water is sprayed out through the nozzle 7 and comes into contact with the rising waste gas to further absorb residual pollutants in the waste gas, realizing the self-circulation of the spray water to replace fresh water resources and significantly reduce the external water replenishment demand. This is especially suitable for water-scarce areas or high water-consuming industries. The other part of the reclaimed water can be discharged or reused.

[0032] The exhaust gas rises through the packing assembly 5, where pollutants are intercepted and adsorbed, becoming compliant emission gas. Under the action of the exhaust fan 17, the compliant emission gas flows from the outlet 2 through the exhaust pipe 16, the three-way pipe 21, and the gas cooler 20, then enters the condenser coil 19 within the condenser 11 through the gas delivery pipe 18, assisting in cooling the condenser 11. Finally, it is discharged from the output end of the condenser coil 19. The gas electric heater 23 recovers heat from the output end of the condenser coil 19, compresses it, and delivers it to the heating coil 26 to heat the evaporator 9. Once the system produces stable compliant gas, the three-way pipe 21 is switched via the regulating valve 22, connecting the exhaust pipe 16 to the exhaust fan 17, forming a stable thermal cycle and achieving waste heat recovery and purified gas emission.

[0033] In use, S1: the waste gas and waste liquid mixture enters the collection tower 1 through the first feed port 3, wherein the waste liquid flows downward and flows through the water outlet 4 and the drain pipe 8 in sequence before entering the evaporator 9; S2: The regulating valve 22 connects the outside air to the input end of the exhaust fan 17. The outside air flows through the gas supply pipe 18, the condenser coil 19 and the first connecting pipe 24 into the gas electric heater 23. The gas electric heater 23 is started, and the gas enters the heating coil 26 through the second connecting pipe 25 to heat the waste liquid in the evaporator 9, so that the waste liquid evaporates into water vapor. The water vapor enters the condenser 11 and is condensed into regenerated water. The regenerated water enters the water storage tank 13. S3: Start the water pump 14 to extract the regenerated water in the water storage tank 13, and transport part of the regenerated water to the spray pipe 6 through the three-way valve 15. The regenerated water is sprayed out through the nozzle 7 and sprayed above the packing assembly 5. S4: After the exhaust gas enters the collection tower 1, it moves upward and comes into contact with the sprayed regenerated water at the packing assembly 5 to achieve exhaust gas washing.

[0034] S5: The qualified emission gas after being filtered by the packing assembly 5 flows through the air outlet 2 and the exhaust pipe 16. After a stable qualified emission gas is generated, the exhaust pipe 16 is connected to the input end of the exhaust fan 17 through the regulating valve 22. The emission gas is transported to the gas delivery pipe 18 under the action of the exhaust fan 17, and then introduced into the condenser coil 19 in the condenser 11 to cool the inside of the condenser 11 and assist the condensation process of water vapor. S6: After the qualified emission gas is discharged from the condenser coil 19, it flows through the first connecting pipe 24 into the gas electric heater 23 for heating. After heating, the qualified emission gas enters the heating coil 26 through the second connecting pipe 25 to heat the waste liquid in the evaporator 9, and is discharged from the output end of the heating coil 26.

[0035] Compared to existing technologies, the waste heat from the compliant emissions and the heat pump system provide a heat source for the low-temperature evaporation of waste liquid. At the same time, the cooled gas assists the condenser 11 in cooling down, achieving efficient recovery and reuse of heat within the system and reducing overall energy consumption.

[0036] By switching the operating conditions of regulating valve 22 and three-way pipe 21, the system can flexibly adjust the operating mode according to the changes in gas and liquid load, ensuring efficient and energy-saving operation under stable conditions, and improving the reliability and adaptability of the device.

[0037] In this embodiment: the packing assembly 5 includes a support frame 27 that slides within the collection tower 1, and a plurality of hollow spherical packings 28 are placed within the support frame 27.

[0038] A guide rod 29 is fixedly connected inside the collection tower 1. The guide rod 29 extends upward along the central axis of the collection tower 1. Both ends of the guide rod 29 can be detachably connected to limit blocks 30. The support frame 27 is provided with a sliding groove 31 that matches the guide rod 29.

[0039] When the pressure of the exhaust gas below the support frame 27 is greater than a set value (e.g., 500 Pa), the support frame 27 moves upward to abut against the limiting block 30 at the upper end of the guide rod 29, thereby causing the multiple hollow ball packings 28 inside the support frame 27 to move. When the pressure of the exhaust gas below the support frame 27 is less than the set value, the support frame 27 falls back to abut against the limiting block 30 at the lower end of the guide rod 29 under the action of gravity.

[0040] In this scheme: when the exhaust gas pressure inside the collection tower 1 and below the support frame 27 is less than a set value, the support frame 27, under its own gravity, slides down along the guide rod 29 until it abuts against the lower limit block 30. At this time, the support frame 27 is in a low position, and multiple hollow spherical packings 28 naturally accumulate inside the support frame 27, forming a static packing layer. The rising exhaust gas passes through the gaps between the hollow spherical packings 28, and particulate matter and some pollutants in the exhaust gas are captured or intercepted by impact on the surface of the hollow spherical packings 28, achieving preliminary filtration.

[0041] When the exhaust gas pressure below the support frame 27 exceeds the set value (e.g., a sudden increase in exhaust gas production or increased intake gas concentration leading to increased resistance), the upward airflow pressure is converted into lift on the support frame 27. The support frame 27 slides upward along the guide rod 29 until it abuts against the upper limit block 30. During the upward movement, the hollow spherical packing 28 inside the support frame 27 rolls, rubs, and rearranges due to inertia, mutual collisions, and relative movement with the support frame 27. The packing layer, which might have clumped or blocked, is "disturbed" or even "fluidized."

[0042] When the exhaust gas pressure fluctuates, the support frame 27 dynamically floats between the upper and lower limit blocks 30 according to the pressure. When the pressure is high, the packing layer "loosens" or "rises" to reduce resistance; when the pressure is low, it falls back to maintain effective contact. The hollow ball packing 28 continuously tumbles during the floating process, constantly renewing the gas-liquid contact surface, causing the attached substances to fall off due to mechanical vibration and be carried away by the downward flowing waste liquid. The hollow ball packing 28 is driven by the kinetic energy of the exhaust gas itself, achieving online self-cleaning and extending the cleaning cycle and maintenance interval.

[0043] The two limiting blocks 30 clearly define the range of motion, reducing the probability that the support frame 27 will detach or collide with the top or bottom of the tower.

[0044] In this embodiment: a demister 32 is detachably installed inside the collection tower 1, and the demister 32 is located between the support frame 27 and the air outlet 2. When the compliant emission gas passes through the demister 32, the demister 32 intercepts the water vapor in the compliant emission gas.

[0045] In this design, the demister 32 is detachably installed inside the collection tower 1, located above the support frame 27 and below the air outlet 2. The qualified exhaust gas, purified by the packing assembly 5, flows upward under the suction of the exhaust fan 17, first passing through the demister 32, and then being discharged through the air outlet 2 and the exhaust pipe 16.

[0046] Under continuous spraying conditions from spray pipe 6 and nozzle 7, the rising, compliant emission gas carries a large number of fine droplets and saturated water vapor. Due to their relatively large mass, the droplets in the gas cannot quickly change direction with the airflow when passing around the blades or mesh of demister 32, and instead collide with the surface of demister 32 and coalesce. The tiny droplets are adsorbed upon contact with the fibers or blades of demister 32. The coalesced droplets increase in size and, under the influence of gravity, slide down the surface of demister 32, eventually falling back to the packing assembly 5 or the bottom of the tower, and being discharged along with the waste liquid.

[0047] The demister 32 removes liquid water and water mist in advance, significantly reducing the risk of icing and improving the applicability of the device in cold regions. The intercepted water is condensed by the demister 32 and returned to the collection tower 1, and finally enters the evaporator 9 for regeneration through the outlet 4, improving the overall water recovery rate.

[0048] In this embodiment: the collecting tower 1 is provided with a second feed inlet 33, the second feed inlet 33 is located above the first feed inlet 3, and a guide plate 34 is fixedly connected to the second feed inlet 33. The guide plate 34 is inclined downward and is located directly above the first feed inlet 3. The second feed inlet 33 is used specifically for discharging waste liquid. Under the action of the guide plate 34, the waste liquid falls in a water curtain shape and blocks the upward movement of the exhaust gas. During the falling process, the waste liquid comes into contact with the exhaust gas.

[0049] In this design: the first inlet 3 (bottom) is used to receive a mixture of waste gas and waste liquid or waste gas. The second inlet 33 (top) is specifically used to discharge waste liquid, which enters the collection tower 1 through this inlet.

[0050] The guide plate 34 is fixedly connected to the second inlet 33 and is inclined downwards. After the waste liquid flows out of the second inlet 33, it flows along the surface of the guide plate 34 under the action of gravity. When it leaves the end of the guide plate 34, it forms a continuous and spreading water curtain due to surface tension and flow continuity. This water curtain is located directly above the first inlet 3 and covers most or all of the flow area on the cross-section of the collection tower 1.

[0051] After entering through the first inlet 3, the exhaust gas moves upwards, passing through the water curtain to continue rising to the packing assembly 5 area. During its passage through the water curtain, the exhaust gas undergoes intense gas-liquid two-phase contact with the falling waste liquid: particulate matter in the exhaust gas is captured by the droplets and carried downwards. Soluble pollutants in the exhaust gas (such as ammonia, hydrogen sulfide, and hydrophilic components of volatile organic compounds) dissolve or are absorbed into the waste liquid. Furthermore, the exhaust gas temperature may decrease due to contact with the cooler waste liquid, which is beneficial for subsequent condensation and recovery.

[0052] Pre-washing of exhaust gas before it enters the core purification zone via a water curtain extends the effective gas-liquid contact time and distance, significantly improving the removal rate of pollutants, especially particulate matter and soluble gases. Furthermore, the waste liquid used in the water curtain is itself the waste liquid to be treated, reducing the consumption of fresh water resources. The downward-sloping design of the guide plate 34 allows the waste liquid to continuously flush its surface, reducing the probability of solid particles depositing on the guide plate 34 surface.

[0053] In this embodiment: the diameter of the lower end of the evaporator 9 gradually decreases downward, and a through hole 35 is provided at the lower end of the evaporator 9. A waste discharge pipe 36 is connected to the through hole 35, and a valve 37 is installed at the pipe opening of the waste discharge pipe 36 away from the evaporator 9. When the valve 37 is closed, the remaining concentrated liquid after evaporation settles and is stored at the bottom of the evaporator 9 under the action of gravity. When the valve 37 is opened, the concentrated liquid flows through the waste discharge pipe 36 and is discharged.

[0054] In this scheme: the waste liquid is heated by the heating coil 26 in the evaporator 9 and undergoes low-temperature boiling and evaporation under the negative pressure created by the vacuum pump 12. Moisture continuously converts into water vapor and enters the condenser 11, while non-evaporable components such as dissolved solids, high-boiling-point organic matter, and salts in the waste liquid gradually concentrate. When valve 37 is closed, the concentrated liquid cannot be discharged and naturally sinks under gravity, storing at the conical bottom of the evaporator 9, forming a clear stratification interface with the waste liquid to be evaporated above. When valve 37 is opened, the concentrated liquid automatically flows through the waste discharge pipe 36 and is discharged by gravity. The tapered conical structure reduces dead zones and accumulation surfaces, ensuring the concentrated liquid always converges towards the lowest point, making it less prone to adhering to the tank wall and reducing the risk of scaling.

[0055] A method for co-treating waste gas and waste liquid includes a waste gas and waste liquid co-treating device. S1: The waste gas and waste liquid mixture enters the collection tower 1 through the first feed port 3, wherein the waste liquid flows downward and flows through the water outlet 4 and the drain pipe 8 in sequence before entering the evaporator 9; S2: The regulating valve 22 connects the outside air to the input end of the exhaust fan 17. The outside air flows through the gas supply pipe 18, the condenser coil 19 and the first connecting pipe 24 into the gas electric heater 23. The gas electric heater 23 is started, and the gas enters the heating coil 26 through the second connecting pipe 25 to heat the waste liquid in the evaporator 9, so that the waste liquid evaporates into water vapor. The water vapor enters the condenser 11 and is condensed into regenerated water. The regenerated water enters the water storage tank 13. S3: Start the water pump 14 to extract the regenerated water in the water storage tank 13, and transport part of the regenerated water to the spray pipe 6 through the three-way valve 15. The regenerated water is sprayed out through the nozzle 7 and sprayed above the packing assembly 5. S4: After the exhaust gas enters the collection tower 1, it moves upward and comes into contact with the sprayed regenerated water at the packing assembly 5 to achieve exhaust gas washing.

[0056] S5: The qualified emission gas after being filtered by the packing assembly 5 flows through the air outlet 2 and the exhaust pipe 16. After a stable qualified emission gas is generated, the exhaust pipe 16 is connected to the input end of the exhaust fan 17 through the regulating valve 22. The emission gas is transported to the gas delivery pipe 18 under the action of the exhaust fan 17, and then introduced into the condenser coil 19 in the condenser 11 to cool the inside of the condenser 11 and assist the condensation process of water vapor. S6: After the qualified emission gas is discharged from the condenser coil 19, it flows through the first connecting pipe 24 into the gas electric heater 23 for heating. After heating, the qualified emission gas enters the heating coil 26 through the second connecting pipe 25 to heat the waste liquid in the evaporator 9, and is discharged from the output end of the heating coil 26.

[0057] In this solution, outside air is introduced through regulating valve 22 as the initial heat source for the gas electric heater 23, enabling the heating coil 26 to initially heat the waste liquid in the evaporator 9. This solves the problem of insufficient initial emission volume of compliant gas and lack of heat transfer medium.

[0058] Wastewater is converted into reclaimed water through evaporation and condensation, and stored in water tank 13. The reclaimed water is partially returned to spray pipe 6 via pump 14 and three-way valve 15, serving as wastewater for waste gas scrubbing. This replaces fresh water resources, achieving a closed-loop cycle from wastewater to reclaimed water and then to scrubbing liquid, reducing the total amount of wastewater discharged. It is suitable for water-scarce areas or water-intensive industries.

[0059] One of the output terminals of the three-way valve 15 is connected to the outside. When the reclaimed water level in the water storage tank 13 is higher than the upper limit, the excess reclaimed water can be discharged or reused in other processes. This achieves adjustable water balance, adapts to different waste gas or waste liquid loads, and reduces the probability of excessive reclaimed water accumulating in the system.

[0060] Once the emissions stabilize after meeting standards, the gases are no longer released to the outside. Instead, they are first used to cool the condenser 11, then heated by a heat pump before being used to heat the evaporator 9, and finally discharged. The waste heat from the exhaust gas is utilized in a cascade manner, reducing the cooling water consumption of the condenser 11 or the energy consumption of the cooling fan. The exhaust gas is cooled before final discharge, reducing thermal pollution.

[0061] Compared to existing technologies, the waste heat from the compliant emissions and the heat pump system provide a heat source for the low-temperature evaporation of waste liquid. At the same time, the cooled gas assists the condenser 11 in cooling down, achieving efficient recovery and reuse of heat within the system and reducing overall energy consumption.

[0062] By switching the operating conditions of regulating valve 22 and three-way pipe 21, the system can flexibly adjust the operating mode according to the changes in gas and liquid load, ensuring efficient and energy-saving operation under stable conditions, and improving the reliability and adaptability of the device.

[0063] Finally, it should be noted that the above 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 preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A waste gas and waste liquid co-treatment device, comprising a collection tower (1), wherein the collection tower (1) is provided with an air outlet (2), a first feed inlet (3) and a water outlet (4) arranged sequentially from top to bottom along its height direction, characterized in that: The collecting tower (1) is equipped with a packing assembly (5), and a spray pipe (6) is installed above the packing assembly (5). One end of the spray pipe (6) is connected to a nozzle (7) inside the collecting tower (1). The outlet (4) is connected to a drain pipe (8), and the end of the drain pipe (8) away from the outlet (4) is connected to an evaporator (9). A heating component (10) is installed inside the evaporator (9). The output end of the evaporator (9) is connected to a condenser (11). A vacuum pump (12) is connected to the condenser (11). The output end of the condenser (11) is connected to a water storage tank (13). A water pump (14) is connected inside the water storage tank (13). The output end of the water pump (14) is connected to a three-way valve (15). The two output ends of the three-way valve (15) are connected to the outside and the spray pipe (6), respectively. After the waste gas and waste liquid mixture enters the collection tower (1) through the first feed port (3), the waste liquid flows downward under the action of gravity, while the waste gas moves upward. The waste liquid flows through the outlet (4), drain pipe (8), evaporator (9), and condenser (11) and is transformed into regenerated water and enters the water storage tank (13). Part of the regenerated water enters the spray pipe (6) through the water pump (14) and three-way valve (15) and is then sprayed out through the nozzle (7) to contact the upward-moving waste gas.

2. The waste gas and waste liquid co-treatment device according to claim 1, characterized in that: An exhaust pipe (16) is connected to the air outlet (2), and an exhaust fan (17) is connected to the output end of the exhaust pipe (16). An air supply pipe (18) is connected to the output end of the exhaust fan (17). A condenser coil (19) is installed inside the condenser (11). The end of the air supply pipe (18) away from the exhaust fan (17) is connected to the input end of the condenser coil (19). The exhaust gas moves upward and is filtered by the packing assembly (5) and becomes qualified emission gas. Under the action of the exhaust fan (17), the qualified emission gas flows through the exhaust pipe (16) and the gas transmission pipe (18) and enters the condenser coil (19), thereby providing auxiliary cooling to the inside of the condenser (11).

3. The waste gas and waste liquid co-treatment device according to claim 2, characterized in that: A gas cooler (20) is connected between the exhaust fan (17) and the gas supply pipe (18). A three-way pipe (21) is connected between the exhaust pipe (16) and the exhaust fan (17). The three-way pipe (21) has two input ends and one output end. The output end of the three-way pipe (21) is connected to the input end of the exhaust fan (17). The two input ends of the three-way pipe (21) are connected to the outside and the exhaust pipe (16) respectively. A regulating valve (22) is installed inside the three-way pipe (21). Once a stable, compliant emission gas is generated, the regulating valve (22) is adjusted to connect the exhaust pipe (16) to the input end of the exhaust fan (17). The compliant emission gas enters the gas cooler (20) through the exhaust fan (17) for cooling, and then enters the condenser coil (19) through the gas delivery pipe (18) to cool the inside of the condenser (11).

4. The waste gas and waste liquid co-treatment device according to claim 3, characterized in that: The heating assembly (10) includes a gas electric heater (23). The input end and the output end of the gas electric heater (23) are respectively connected to a first connecting pipe (24) and a second connecting pipe (25). The end of the first connecting pipe (24) away from the gas electric heater (23) is connected to the output end of the condensing coil (19). The end of the second connecting pipe (25) away from the gas electric heater (23) is connected to a heating coil (26). The heating coil (26) is located inside the evaporator (9). The output end of the heating coil (26) extends upward through the side wall of the evaporator (9). After the qualified emission gas is discharged from the output end of the condenser coil (19), it enters the gas electric heater (23) through the first connecting pipe (24) for heating, and then is transported to the heating coil (26) through the second connecting pipe (25) to heat the evaporator (9). Finally, the qualified emission gas is discharged to the outside from the output end of the heating coil (26).

5. The waste gas and waste liquid co-treatment device according to claim 1, characterized in that: The packing assembly (5) includes a support frame (27) that slides within the collection tower (1), and a plurality of hollow spherical packings (28) are placed within the support frame (27). The collection tower (1) is fixedly connected with a guide rod (29). The guide rod (29) extends upward along the central axis of the collection tower (1). Both ends of the guide rod (29) can be detachably connected with limit blocks (30). The support frame (27) is provided with a sliding groove (31) that matches the guide rod (29). When the pressure of the exhaust gas below the support frame (27) is greater than the set value, the support frame (27) moves upward to abut against the limiting block (30) at the upper end of the guide rod (29), thereby causing multiple hollow ball packings (28) inside the support frame (27) to move. When the pressure of the exhaust gas below the support frame (27) is less than the set value, the support frame (27) falls back to abut against the limiting block (30) at the lower end of the guide rod (29) under the action of gravity.

6. The waste gas and waste liquid co-treatment device according to claim 5, characterized in that: A demister (32) is detachably installed inside the collection tower (1). The demister (32) is located between the support frame (27) and the air outlet (2). When the compliant emission gas passes through the demister (32), the demister (32) intercepts the water vapor of the compliant emission gas.

7. The waste gas and waste liquid co-treatment device according to claim 1, characterized in that: The collecting tower (1) is provided with a second feed inlet (33), which is located above the first feed inlet (3). A guide plate (34) is fixedly connected to the second feed inlet (33), which is inclined downward and located directly above the first feed inlet (3). The second feed inlet (33) is used specifically for discharging waste liquid. The waste liquid falls in a water curtain shape under the action of the guide plate (34), and blocks the upward movement of the exhaust gas. The waste liquid comes into contact with the exhaust gas during the falling process.

8. The waste gas and waste liquid co-treatment device according to claim 1, characterized in that: The diameter of the lower end of the evaporator (9) gradually decreases downward. A through hole (35) is provided at the lower end of the evaporator (9). A waste discharge pipe (36) is connected to the through hole (35). A valve (37) is installed at the pipe opening of the waste discharge pipe (36) away from the evaporator (9). When the valve (37) is closed, the remaining concentrated liquid after the waste liquid is evaporated sinks and is stored at the bottom of the evaporator (9) under the action of gravity. When the valve (37) is opened, the concentrated liquid flows through the waste discharge pipe (36) and is discharged.

9. A method for co-treating waste gas and waste liquid, comprising the waste gas and waste liquid co-treating device as described in claim 4, characterized in that: S1: The waste gas and waste liquid mixture enters the collection tower (1) through the first feed port (3), wherein the waste liquid flows downward and flows through the outlet (4) and drain pipe (8) in sequence before entering the evaporator (9). S2: The outside air is connected to the input end of the exhaust fan (17) through the regulating valve (22). The outside air flows through the gas supply pipe (18), the condenser coil (19) and the first connecting pipe (24) into the gas electric heater (23). The gas electric heater (23) is started. The gas electric heater (23) enters the heating coil (26) through the second connecting pipe (25) to heat the waste liquid in the evaporator (9) so that the waste liquid evaporates into water vapor. The water vapor enters the condenser (11) and is condensed into regenerated water. The regenerated water enters the water storage tank (13). S3: Start the water pump (14) to extract the regenerated water in the water storage tank (13), and transport part of the regenerated water to the spray pipe (6) through the three-way valve (15). The regenerated water is sprayed out through the nozzle (7) and sprayed above the packing assembly (5). S4: After the exhaust gas enters the collection tower (1), it moves upward and comes into contact with the sprayed regenerated water at the packing assembly (5) to achieve exhaust gas washing.

10. The method for co-treatment of waste gas and waste liquid according to claim 9, characterized in that: Also includes: S5: The qualified emission gas after being filtered by the packing assembly (5) flows through the air outlet (2) and the exhaust pipe (16). When a stable qualified emission gas is generated, the exhaust pipe (16) is connected to the input end of the exhaust fan (17) through the regulating valve (22). The emission gas is transported to the gas transmission pipe (18) under the action of the exhaust fan (17), and then introduced into the condenser coil (19) in the condenser (11) to cool the inside of the condenser (11) and assist the condensation process of water vapor. S6: After the qualified emission gas is discharged from the condenser coil (19), it flows through the first connecting pipe (24) into the gas electric heater (23) for heating. After heating, the qualified emission gas enters the heating coil (26) through the second connecting pipe (25) to heat the waste liquid in the evaporator (9) and is discharged from the output end of the heating coil (26).

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