Printing and dyeing wastewater heat energy recycling device
By introducing recovery and drying mechanisms into the printing and dyeing wastewater treatment device and optimizing the heat recovery and material drying processes, the problems of low heat recovery efficiency of printing and dyeing wastewater and stability of the activated sludge system were solved, and efficient heat energy utilization and sludge reduction were achieved.
Patent Information
- Application Number
- CN202422610930.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-10-29
Smart Images
Figure CN223361184U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of wastewater heat recovery and utilization, and specifically to a printing and dyeing wastewater heat recovery and utilization device. Background Art
[0002] With increasingly stringent environmental protection requirements and increasing awareness of resource conservation, efficient treatment and resource recycling of printing and dyeing wastewater have become important directions for the development of the industry.
[0003] Due to the unique printing and dyeing process, the resulting wastewater is generally at a high temperature, which provides a potential for heat recovery. According to 2023 water inflow statistics, there are 11 manufacturers with wastewater suitable for heat recovery (above 45°C), with a daily water volume of approximately 15,000 m³. Of these, four have high-temperature wastewater (above 50°C), with a daily water volume of approximately 5,000 m³. Effectively recovering this heat energy would have significant economic and environmental value.
[0004] As disclosed in Chinese Patent Publication No. (CN218210926), a printing and dyeing wastewater heat energy recovery device is characterized in that it includes a sewage tank, a recovery tank and a water collecting bucket, the lower end of the sewage tank is connected to the top of the recovery tank through a first drain pipe, the top of the recovery tank is connected to the lower end of the water collecting bucket through a second drain pipe, the lower end of the recovery tank is connected to the top of the water collecting bucket through a third drain pipe, the lower end of the recovery tank is provided with a water outlet pipe, the outer wall of the recovery tank is bonded with a first thermal insulation layer, an S-shaped first water inlet pipe is provided in the recovery tank, one end of the first water inlet pipe is connected to the first drain pipe, the other end of the first water inlet pipe is connected to the third drain pipe, a heat recovery device is provided on the outer circle of the first drain pipe, the outer circle of the first drain pipe is bonded with a second thermal insulation layer, the outer wall of the sewage tank is bonded with a third thermal insulation layer, and a PLC controller is provided on the recovery tank.
[0005] However, the existing technology, such as the above-mentioned patent, still has the problem of low efficiency in wastewater heat recovery and utilization, because high-temperature wastewater poses a challenge to the activated sludge biological treatment system. The high-temperature environment will not only reduce the physiological activity of microorganisms in the activated sludge and slow down the metabolic rate, resulting in reduced wastewater treatment efficiency; it may also cause the death of certain microorganisms, further affecting the stability and treatment effect of the activated sludge, and high temperature may also cause the expansion of the activated sludge. The expanded activated sludge will occupy more treatment space, reduce the treatment efficiency, and may even cause the collapse of the treatment system. Utility Model Content
[0006] In response to the shortcomings of the existing technology, the present application provides a printing and dyeing wastewater heat energy recovery and utilization device, which has the advantages of good wastewater heat energy recovery and utilization effect, and solves the problem of low wastewater heat energy recovery and utilization efficiency.
[0007] To achieve the above-mentioned purpose, the present application provides the following technical solution: a printing and dyeing wastewater heat energy recovery and utilization device, comprising a wastewater treatment tank, a recovery mechanism is provided on the left inner wall of the wastewater treatment tank, and a drying mechanism is provided on the right side of the wastewater treatment tank;
[0008] The recovery mechanism includes an evaporator, a low-pressure pipe, a compressor, a high-pressure pipe, a condenser, a return pipe, an energy storage box, a cold air inlet pipe and a hot air outlet pipe. The evaporator is fixed to the left inner wall of the wastewater treatment tank, the low-pressure pipe is connected to the output end of the evaporator, and the other end of the low-pressure pipe is fixed to the compressor, one end of the high-pressure pipe is connected to the output end of the compressor, and the other end of the high-pressure pipe is connected to the input end of the condenser, one end of the return pipe is connected to the output end of the condenser, and the other end of the return pipe is connected to the input end of the evaporator, the energy storage box is mounted on the outside of the condenser, the cold air inlet pipe is connected to the inner bottom wall of the energy storage box, and the hot air outlet pipe is connected to the top of the energy storage box.
[0009] By adopting this technical solution, a recovery mechanism is set on the left inner wall of the wastewater treatment tank and a drying mechanism is set on the right side to achieve an integrated design of heat recovery and wastewater drying, thereby improving space utilization and operational efficiency.
[0010] Furthermore, a throttle valve is fixed on the outside of the return pipe, and the inner walls of the evaporator and the condenser are filled with coolant.
[0011] By adopting this technical solution, the setting of the throttle valve can accurately control the flow of the working fluid and optimize the efficiency of the heat energy recovery process; the filling of the coolant improves the heat exchange efficiency of the evaporator and condenser.
[0012] Furthermore, the height of the evaporator is equal to the depth of the inner cavity of the wastewater treatment tank.
[0013] By adopting this technical solution, the height of the evaporator is equal to the depth of the inner cavity of the wastewater treatment tank, ensuring the maximization of the heat exchange area during the heat energy recovery process and improving the heat energy recovery efficiency.
[0014] Furthermore, the drying mechanism includes a suction pipe, a molding machine, a processing box, two conveyor belts, a dry air duct, a circulating fan, an evaporative condensing device and an air outlet pipe, one end of the suction pipe is connected to the right inner wall of the wastewater treatment tank, and the other end of the suction pipe is connected to the molding machine, the processing box is fixed on the outside of the molding machine, the two conveyor belts are fixed between the front and rear inner walls of the processing box, and the two conveyor belts are staggered up and down, the dry air duct is connected to the lower surface of the processing box, the air outlet end of the circulating fan is connected to the end of the dry air duct away from the processing box, the evaporative condensing device is fixed to the air inlet end of the circulating fan, one end of the air outlet pipe is connected to the input end of the evaporative condensing device, and the other end of the air outlet pipe is connected to the inner wall of the processing box.
[0015] By adopting this technical solution, the design of the drying mechanism realizes the continuous drying process of the material through the coordinated work of multiple components, thereby improving the drying efficiency and output.
[0016] Furthermore, an installation opening is provided on the inner top wall of the processing box, and the processing box is fixed to the outer side of the molding machine through the installation opening.
[0017] By adopting this technical solution, the fixed connection between the processing box and the forming machine ensures the stability and reliability of the drying process and simplifies the equipment structure.
[0018] Furthermore, a discharge port is provided on the lower left side of the processing box, and a lower hopper is fixed on the inner wall of the discharge port, and the lower hopper is located below the lower conveyor belt.
[0019] By adopting this technical solution, the design of the discharge port and lower hopper realizes the smooth discharge of the dried material, avoids blockage and accumulation, and improves the continuity and efficiency of the drying process.
[0020] Furthermore, a dry material bin is fixed on the outside of the processing box and below the lower hopper.
[0021] By adopting this technical solution, the setting of the dry material bin provides storage space for the dried material, which is convenient for the collection and subsequent processing of the material.
[0022] Furthermore, the top end of the dry air duct passes through and extends to the inner bottom wall of the processing box.
[0023] By adopting this technical solution, the design of the dry air duct ensures that the hot air can be evenly distributed in the processing box, improving the uniformity and efficiency of material drying.
[0024] Compared with the existing technology, the technical solution of this application has the following beneficial effects:
[0025] 1. The printing and dyeing wastewater heat energy recovery and utilization device improves the efficiency of heat recovery from printing and dyeing wastewater through a specific recovery mechanism design, including the coordinated work of evaporators, compressors, condensers and other components. The recovered heat energy can be used to heat air or other media, providing the necessary heat energy for the wastewater treatment process, thereby reducing the consumption of additional energy. By lowering the wastewater temperature, a more suitable living environment is provided for the microorganisms in the activated sludge, improving the efficiency and effect of wastewater biological treatment. Through heat recovery, the negative impact of high-temperature wastewater on the stability and treatment effect of the activated sludge system is effectively reduced.
[0026] 2. The printing and dyeing wastewater heat recovery and utilization device reduces the amount of sludge disposal and related costs through sludge drying technology, saves costs for the printing and dyeing wastewater treatment industry, reduces pollution to the environment, and improves the environmental friendliness of the wastewater treatment process. It provides new technical ideas and solutions for the printing and dyeing wastewater treatment industry, promotes the industry's technological progress and sustainable development, and can bring significant economic savings to printing and dyeing wastewater treatment manufacturers. Through heat recovery and sludge drying technology, the stability of the entire wastewater treatment system is enhanced, and problems such as activated sludge expansion caused by high-temperature wastewater are reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 This is a schematic diagram of the structure of this application;
[0028] Figure 2 This is a schematic diagram of the recycling organization for this application;
[0029] Figure 3 This is a schematic diagram of the drying mechanism for this application;
[0030] Figure 4 This is a partial schematic diagram of the drying mechanism of this application.
[0031] In the figure: 1. Wastewater treatment tank; 2. Recovery mechanism; 21. Evaporator; 22. Low-pressure pipe; 23. Compressor; 24. High-pressure pipe; 25. Condenser; 26. Return pipe; 27. Energy storage box; 28. Cold air inlet pipe; 29. Hot air outlet pipe; 3. Drying mechanism; 31. Extraction pipe; 32. Molding machine; 33. Processing box; 34. Conveyor belt; 35. Dry air pipe; 36. Circulating fan; 37. Evaporation and condensation equipment; 38. Air outlet pipe; 39. Lower hopper; 310. Dry material bin. DETAILED DESCRIPTION
[0032] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.
[0033] See also Figure 1 The printing and dyeing wastewater heat energy recovery and utilization device in this embodiment includes a wastewater treatment pool 1, a recovery mechanism 2 is provided on the left inner wall of the wastewater treatment pool 1, and a drying mechanism 3 is provided on the right side of the wastewater treatment pool 1.
[0034] See also Figure 2In order to recycle the heat energy of printing and dyeing wastewater, the recovery mechanism 2 in this embodiment includes an evaporator 21, a low-pressure pipe 22, a compressor 23, a high-pressure pipe 24, a condenser 25, a return pipe 26, an energy storage box 27, a cold air inlet pipe 28 and a hot air outlet pipe 29. The evaporator 21 is fixed to the left inner wall of the wastewater treatment tank 1, and the printing and dyeing wastewater is introduced into the wastewater treatment tank 1. The heat energy in the wastewater is absorbed by contact with the evaporator 21, and the working medium inside the evaporator 21 evaporates into steam. The low-pressure pipe 22 is connected to the output end of the evaporator 21, and the other end of the low-pressure pipe 22 is fixed to the compressor 23. One end of the high-pressure pipe 24 is connected to the output end of the compressor 23, and the high-pressure pipe 2 The other end of the pipe 4 is connected to the input end of the condenser 25. The low-pressure pipe 22 transports the steam to the compressor 23. The compressor 23 increases the pressure and temperature of the steam. The high-temperature and high-pressure steam enters the condenser 25, where it condenses and releases heat. One end of the return pipe 26 is connected to the output end of the condenser 25, and the other end of the return pipe 26 is connected to the input end of the evaporator 21. The energy storage tank 27 is mounted on the outside of the condenser 25 to heat the air or other medium in the energy storage tank 27. The condensed liquid working medium returns to the evaporator 21 through the return pipe 26 to complete the cycle. The cold air inlet pipe 28 is connected to the inner bottom wall of the energy storage tank 27, and the hot air exhaust pipe 29 is connected to the top of the energy storage tank 27.
[0035] In this embodiment, a throttle valve is fixed to the outside of the return pipe 26, the inner walls of the evaporator 21 and the condenser 25 are filled with coolant, the height of the evaporator 21 is equal to the depth of the inner cavity of the wastewater treatment tank 1, and the energy storage box 27 may be used to store and regulate thermal energy to adapt to different thermal requirements. The cold air inlet pipe 28 transports cold air into the energy storage box 27, and the cold air passes through the condenser 25 for heat exchange. The heated air is output through the hot air exhaust pipe 29 for other purposes.
[0036] See also Figures 3 and 4In order to reduce the amount of sludge to be disposed of, the drying mechanism 3 in this embodiment includes a suction pipe 31, a molding machine 32, a processing box 33, two conveyor belts 34, a dry air duct 35, a circulating fan 36, an evaporative condensation device 37 and an air outlet pipe 38. One end of the suction pipe 31 is connected to the right inner wall of the wastewater treatment tank 1. Through the suction pipe 31, the material in the wastewater treatment tank 1 or the solid components in the wastewater are transported to the molding machine 32. The molding machine 32 performs molding processing on the material to make it suitable for the subsequent drying process. The other end of the suction pipe 31 is connected to the molding machine 32. The processing box 33 is fixed on the outside of the molding machine 32. The two conveyor belts 34 are connected to the inner walls of the front and rear sides of the processing box 33. The two conveyor belts 34 are staggered in an upper and lower arrangement. The formed materials are transported to the drying area through the processing box 33 and the conveyor belts 34. The dry air duct 35 is connected to the lower surface of the processing box 33. The air outlet end of the circulating fan 36 is connected to the end of the dry air duct 35 away from the processing box 33. The evaporative condensing device 37 is fixed to the air inlet end of the circulating fan 36. One end of the air outlet duct 38 is connected to the input end of the evaporative condensing device 37, and the other end of the air outlet duct 38 is connected to the inner wall of the processing box 33. The circulating fan 36 sends hot air into the processing box 33 through the dry air duct 35 to heat and dry the materials. The materials move on the conveyor belt 34 and are affected by the hot air and gradually lose moisture.
[0037] In this embodiment, the inner top wall of the processing box 33 is provided with a mounting port, and the processing box 33 is fixed to the outer side of the forming machine 32 through the mounting port. A discharge port is provided on the lower left side of the processing box 33, and a lower hopper 39 is fixed to the inner wall of the discharge port. The lower hopper 39 is located below the lower conveyor belt 34. A dry material bin 310 is fixed on the outside of the processing box 33 and below the lower hopper 39. The top of the dry air duct 35 passes through and extends to the inner bottom wall of the processing box 33. The evaporation and condensation equipment 37 may be used to recover the water evaporated during the drying process and adjust the humidity and temperature of the hot air. The dried material falls into the dry material bin 310 through the lower hopper 39 to complete the drying process. The dried material can be taken out from the dry material bin 310 for further processing or utilization.
[0038] It should be noted that the evaporation and condensation equipment 37 is a conventional evaporation and condensation structure, which includes components such as evaporation, condensation, and compression. Its principle is to use hot air for drying. The moisture content of the material after drying is reduced, and the dry cold air is heated by the compressor to form recycled hot air. The specific structure will not be repeated in this application.
[0039] The working principle of the above embodiment is:
[0040] (1) The printing and dyeing wastewater is introduced into the wastewater treatment pool 1. The heat energy in the wastewater is absorbed by contacting with the evaporator 21. The working medium inside the evaporator 21 evaporates into steam. The low-pressure pipe 22 transports the steam to the compressor 23. The compressor 23 increases the pressure and temperature of the steam. The high-temperature and high-pressure steam enters the condenser 25, condenses and releases heat in the condenser 25, and heats the air or other medium in the energy storage tank 27. The condensed liquid working medium returns to the evaporator 21 through the return pipe 26, completing the cycle. The energy storage tank 27 may be used to store and regulate heat energy to meet different heat requirements. The cold air inlet pipe 28 transports cold air to the energy storage tank 27. The cold air passes through the condenser 25 for heat exchange. The heated air is output through the hot air exhaust pipe 29 for other purposes.
[0041] (2) The material in the wastewater treatment tank 1 or the solid components in the wastewater are transported to the molding machine 32 through the extraction pipe 31. The molding machine 32 molds the material to make it suitable for the subsequent drying process. The molded material is transported to the drying area through the processing box 33 and the conveyor belt 34. The circulating fan 36 sends hot air into the processing box 33 through the dry air pipe 35 to heat and dry the material. The material moves on the conveyor belt 34 and is affected by the hot air and gradually loses moisture. The evaporation condensation device 37 may be used to recover the evaporated moisture during the drying process and adjust the humidity and temperature of the hot air. The dried material falls into the dry material bin 310 through the lower hopper 39 to complete the drying process. The dried material can be taken out from the dry material bin 310 for further processing or utilization.
Claims
1. A device for recovering and utilizing heat energy from printing and dyeing wastewater, comprising a wastewater treatment tank (1), characterized in that: A recovery mechanism (2) is provided on the left inner wall of the wastewater treatment tank (1), and a drying mechanism (3) is provided on the right side of the wastewater treatment tank (1); The recovery mechanism (2) includes an evaporator (21), a low-pressure pipe (22), a compressor (23), a high-pressure pipe (24), a condenser (25), a return pipe (26), an energy storage box (27), a cold air inlet pipe (28) and a hot air outlet pipe (29), wherein the evaporator (21) is fixed to the left inner wall of the wastewater treatment tank (1), the low-pressure pipe (22) is connected to the output end of the evaporator (21), and the other end of the low-pressure pipe (22) is fixed to the compressor (23), and the high-pressure pipe (24) is fixed to the left inner wall of the wastewater treatment tank (1). One end is connected to the output end of the compressor (23), and the other end of the high-pressure pipe (24) is connected to the input end of the condenser (25), one end of the return pipe (26) is connected to the output end of the condenser (25), and the other end of the return pipe (26) is connected to the input end of the evaporator (21), the energy storage box (27) is sleeved on the outside of the condenser (25), the cold air inlet pipe (28) is connected to the inner bottom wall of the energy storage box (27), and the hot air exhaust pipe (29) is connected to the top end of the energy storage box (27).
2. The printing and dyeing wastewater heat energy recovery and utilization device according to claim 1, characterized in that: A throttle valve is fixed on the outside of the return pipe (26), and the inner walls of the evaporator (21) and the condenser (25) are filled with coolant.
3. The device for recovering heat energy from printing and dyeing wastewater according to claim 1, characterized in that: The height of the evaporator (21) is equal to the depth of the inner cavity of the wastewater treatment tank (1).
4. The printing and dyeing wastewater heat energy recovery and utilization device according to claim 1 is characterized in that: The drying mechanism (3) includes a material extraction pipe (31), a molding machine (32), a processing box (33), two conveyor belts (34), a dry air duct (35), a circulating fan (36), an evaporation condensation device (37) and an air outlet pipe (38). One end of the material extraction pipe (31) is connected to the right inner wall of the wastewater treatment tank (1), and the other end of the material extraction pipe (31) is connected to the molding machine (32). The processing box (33) is fixed on the outside of the molding machine (32). The two conveyor belts (34) are connected to the processing box (33). ), and the two conveyor belts (34) are staggered in an upper and lower manner, the dry air duct (35) is connected to the lower surface of the processing box (33), the air outlet end of the circulating fan (36) is connected to the end of the dry air duct (35) away from the processing box (33), the evaporative condensing device (37) is fixed to the air inlet end of the circulating fan (36), one end of the air outlet duct (38) is connected to the input end of the evaporative condensing device (37), and the other end of the air outlet duct (38) is connected to the inner wall of the processing box (33).
5. The device for recovering heat energy from printing and dyeing wastewater according to claim 4, characterized in that: The inner top wall of the processing box (33) is provided with a mounting opening, and the processing box (33) is fixed to the outer side of the molding machine (32) through the mounting opening.
6. The device for recovering heat energy from printing and dyeing wastewater according to claim 4, characterized in that: A discharge port is provided on the lower left side of the processing box (33), and a lower hopper (39) is fixed to the inner wall of the discharge port. The lower hopper (39) is located below the lower conveyor belt (34).
7. The device for recovering heat energy from printing and dyeing wastewater according to claim 6, characterized in that: A dry material bin (310) is fixed outside the processing box (33) and below the lower hopper (39).
8. The device for recovering heat energy from printing and dyeing wastewater according to claim 4, characterized in that: The top end of the dry air duct (35) penetrates and extends to the inner bottom wall of the processing box (33).