Diluted acid purification and concentration treatment system

Abstract

The utility model discloses a dilute acid purification and concentration treatment system which comprises a tubular filter, a membrane distillation system and a flash tower, the membrane distillation system comprises a raw material tank, a concentrated water tank, a membrane distillation assembly, a vacuum pump and a cold circulation system, the flash tower is connected with a heat circulation system, and the membrane distillation assembly comprises a membrane evaporation assembly and a membrane condensation assembly. The bottom of the flash tower is fixedly connected with a concentrated acid pipeline, an efflux pump and an online sulfuric acid concentration meter are arranged on the concentrated acid pipeline, the other end of the concentrated acid pipeline is communicated with a concentrated water tank, and the cold circulation system comprises a cooling water inlet pipeline, a cooling water return pipeline, a circulation water tank and a vacuum system heat exchanger. By means of the structure, removal of impurities in the dilute sulfuric acid and concentration and recycling of the dilute sulfuric acid are achieved, the dilute sulfuric acid can be economically and efficiently purified and concentrated, and the problems that in the waste acid and dilute acid treatment process, the environment is affected, and resources are wasted are solved.

Description

Technical Field

[0001] This utility model relates to the technical field of a dilute acid purification and concentration system, and particularly to a dilute acid purification and concentration system. Background Technology

[0002] Existing dilute acid purification and concentration systems, while designed for ease of use, are not economically efficient in purifying and concentrating dilute sulfuric acid. The process is environmentally unfriendly and wasteful. For example, Chinese patent disclosure "A Waste Acid Concentration and Regeneration Sulfuric Acid Production Line" (application number: CN202121788298.9) includes a pretreatment system, a double-effect evaporation system, and a concentration system. The pretreatment system comprises a raw material tank, a pretreatment tower, a dilution tank, a first filter, an activated carbon adsorption tower, a carbonized buffer tank, and a second filter, all connected in sequence. The system includes a filter and a purified acid tank; the double-effect evaporation system comprises a preheating kettle, a second-effect evaporator, a second-effect intermediate tank, a first-effect evaporator, a first-effect evaporator, and a cooling buffer kettle connected in sequence, with the preheating kettle connected to the purified acid tank; the concentration system comprises a concentration evaporator, a finished product cooling kettle, and a finished product intermediate tank connected in sequence, with the concentration evaporator connected to the cooling buffer kettle via a buffer pump. This structure facilitates use, but it cannot perform economical and efficient purification and concentration of dilute sulfuric acid. The process is environmentally unfriendly and wasteful, limiting its application. Summary of the Invention

[0003] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide a dilute acid purification and concentration treatment system. By setting up components such as a tubular filter, a membrane distillation system, a flash evaporator, a raw material tank, a concentrated water tank, a membrane distillation assembly, a vacuum pump, a cold circulation system, a hot circulation system, a hot circulation heat exchanger, a hot circulation pump, a membrane evaporation assembly and a membrane condensation assembly, concentrated acid pipelines, an external discharge pump and an online sulfuric acid concentration meter, etc., it realizes the removal of impurities in dilute sulfuric acid and the concentration and reuse of dilute sulfuric acid. It can economically and efficiently purify and concentrate dilute sulfuric acid, and solve the problems of environmental impact and resource waste in the process of waste acid and dilute acid treatment.

[0004] This utility model also provides a dilute acid purification and concentration system as described above, comprising: a tubular filter, a membrane distillation system, and a flash distillation tower. The membrane distillation system includes a raw material tank, a concentrated water tank, a membrane distillation assembly, a vacuum pump, and a cold circulation system. A hot circulation system is connected to the flash distillation tower, including a heat exchanger and a pump. The membrane distillation assembly includes a membrane evaporation assembly and a membrane condensation assembly. A concentrated acid pipeline is fixedly connected to the bottom of the flash distillation tower. An external discharge pump and an online sulfuric acid concentration meter are installed on the concentrated acid pipeline. Concentrated acid flows inside the concentrated acid pipeline. The end is connected to the concentrated water tank, and the vacuum pump is connected to the membrane distillation system through the suction pipe. The cold circulation system includes a cooling water inlet pipe, a cooling water return pipe, a circulating water tank, and a vacuum system heat exchanger. The cold circulation system is connected in parallel with the membrane condensation component and the vacuum system heat exchanger for heat exchange. The hot circulation system includes a depressurized steam pipe and a condensate pipe. Through the above structure, the removal of impurities in dilute sulfuric acid and the concentration and reuse of dilute sulfuric acid are realized. It can economically and efficiently purify and concentrate dilute sulfuric acid, and solve the problems of environmental impact and resource waste in the process of waste acid and dilute acid treatment.

[0005] According to the dilute acid purification and concentration system of this utility model, the tubular filter is filled with a micron-sized filter element, a drain valve is provided at the bottom of the tubular filter, and a feed pipe is fixedly connected to the top side surface of the tubular filter. Through the above structure, impurities are filtered and materials are purified.

[0006] According to the dilute acid purification and concentration system of this utility model, the bottom of the tubular filter is fixedly connected to a water outlet pipe, and the other end of the water outlet pipe is connected to the raw material tank. The above structure facilitates the connection.

[0007] According to the dilute acid purification and concentration system of this utility model, a discharge pipe is fixedly connected to the raw material tank, and the discharge pipe is connected to the membrane evaporation assembly. The above structure facilitates connection and use.

[0008] According to the dilute acid purification and concentration system of this utility model, the concentrate tank is fixedly connected to the discharge pipe II, the discharge pipe II is connected to the flash evaporator, and the membrane evaporation component is connected to the concentrate tank through the feed pipe II. The above structure facilitates use.

[0009] According to the dilute acid purification and concentration system of this utility model, the membrane condensation component is provided with a fresh water drainage pipe, which facilitates the discharge of water.

[0010] According to the dilute acid purification and concentration system of this utility model, two sets of tubular filters are provided and operate alternately. The micron-level filter element is made of acid-resistant filter material. The above structure facilitates the filtration of impurities.

[0011] According to the dilute acid purification and concentration system of this utility model, the tubular filter, membrane distillation system and flash tower are supported by support columns. Each connecting pipe of the tubular filter, membrane distillation system and flash tower is equipped with a solenoid valve. When the acidic liquid flows from low to high, it is drawn by an acid-resistant liquid pump. The above structure facilitates the control of the liquid flow.

[0012] Beneficial effects:

[0013] Compared with existing technologies, this dilute acid purification and concentration system, by incorporating components such as a tubular filter, membrane distillation system, flash tower, raw material tank, concentrated water tank, membrane distillation assembly, vacuum pump, cold circulation system, hot circulation system, heat exchanger, heat circulation pump, membrane evaporation assembly and membrane condensation assembly, concentrated acid pipeline, exhaust pump, and online sulfuric acid concentration meter, achieves the removal of impurities from dilute sulfuric acid and the concentration and reuse of dilute sulfuric acid. It can economically and efficiently purify and concentrate dilute sulfuric acid, solving the problems of environmental impact and resource waste in the treatment of waste acid and dilute acid. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0015] Figure 1 This is an overall structural diagram of a dilute acid purification and concentration system according to the present invention;

[0016] Figure 2 This is a rear view structural diagram of a dilute acid purification and concentration treatment system according to the present invention.

[0017] Figure 3 This is a cross-sectional view of a dilute acid purification and concentration system according to the present invention.

[0018] Figure 4 This is a bottom view of the dilute acid purification and concentration system of this utility model.

[0019] Figure 5 This is a side view of the dilute acid purification and concentration system of this utility model.

[0020] Legend:

[0021] 1. Feed pipe 1; 2. Tubular filter; 3. Micron-level filter element; 4. Drain valve; 5. Water outlet pipe 1; 6. Raw material tank; 7. Concentrate tank; 8. Discharge pipe 1; 9. Feed pipe 2; 10. Discharge pipe 2; 11. Concentrated acid pipe; 12. Membrane distillation assembly; 13. Membrane evaporation assembly; 14. Membrane condensation assembly; 15. Vacuum system heat exchanger; 16. Circulating water tank; 17. Vacuum pump; 18. Cooling water inlet pipe; 19. Cooling water return pipe; 20. Fresh water drain pipe; 21. Suction pipe; 22. Flash distillation tower; 23. Heat circulation heat exchanger; 24. Heat circulation pump; 25. Pressure reducing steam pipe; 26. Condensate pipe; 27. External discharge pump; 28. Concentrated acid; 29. ​​Online sulfuric acid concentration meter. Detailed Implementation

[0022] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0023] Reference Figure 1-5 This utility model discloses a dilute acid purification and concentration system, comprising: a tubular filter 2, a membrane distillation system, and a flash distillation tower 22. The membrane distillation system includes a raw material tank 6, a concentrated water tank 7, a membrane distillation assembly 12, a vacuum pump 17, and a cold circulation system. A hot circulation system is connected to the flash distillation tower 22, which includes a hot circulation heat exchanger 23 and a hot circulation pump 24. The membrane distillation assembly 12 includes a membrane evaporation assembly 13 and a membrane condensation assembly 14. A fresh water drainage pipe 20 is provided on the membrane condensation assembly 14. A concentrated acid pipe is fixedly connected to the bottom of the flash distillation tower 22. 11. An external discharge pump 27 and an online sulfuric acid concentration meter 29 are installed on the concentrated acid pipeline 11. Concentrated acid 28 flows in the concentrated acid pipeline 11. The other end of the concentrated acid pipeline 11 is connected to the concentrated water tank 7. The vacuum pump 17 is connected to the membrane distillation system through the suction pipeline 21. The cold circulation system includes a cooling water inlet 18, a cooling water return pipeline 19, a circulating water tank 16, and a vacuum system heat exchanger 15. The cold circulation system is connected in parallel with the membrane condensation assembly 14 and the vacuum system heat exchanger 15 for heat exchange. The hot circulation system includes a pressure-reducing steam pipeline 25 and a condensate pipeline 26.

[0024] Specifically, the concentrate from membrane evaporation module 13 is discharged into concentrate tank 7 through feed pipe 29. Water vapor from membrane evaporation module 13, passing through the distillation membrane, and water vapor from flash evaporator 22 both enter membrane condenser module 14, where they condense under a cold circulation system. The evaporated condensate is discharged through fresh water drain pipe 20. Flash evaporator 22 is fed intermittently via liquid level control. The concentrated acid 28 enters the external discharge pump 27 through concentrated acid pipe 11 at the bottom of flash evaporator 22. The online sulfuric acid concentration meter 29, equipped with a solenoid valve, controls the switching of concentrated acid 28 for external discharge or return to concentrate tank 7. The cold source for the circulation system is cooling water, which enters membrane condenser module 14 and vacuum system in parallel through cooling water inlet pipe 18. Heat exchanger 15, after heat exchange, is discharged through cooling water return pipe 19. Vacuum pump 17 is an acid-resistant water ring vacuum pump, which achieves cooling through vacuum system heat exchanger 15 and circulating water tank 16. The circulating water tank 16 contains cooling water, which is replenished and replaced regularly. The heat source of the heat circulation system is depressurized steam. The depressurized steam enters heat circulation heat exchanger 23 through steam pipe 25 and is discharged through condensate pipe 26. Heat circulation pump 24 circulates waste acid in flash tower 22 through heat circulation heat exchanger 23 for heating. Vacuum pump 17 draws water vapor after vaporization in flash tower 22, which enters membrane condensation component 14 after passing through membrane evaporation component 13. The secondary steam of flash tower 22 is used to heat membrane evaporation component 13.

[0025] The tubular filter 2 is filled with a micron-level filter element 3. A drain valve 4 is installed at the bottom of the tubular filter 2. A feed pipe 1 is fixedly connected to the top side surface of the tubular filter 2. A water outlet pipe 5 is fixedly connected to the bottom of the tubular filter 2. The other end of the water outlet pipe 5 is connected to the raw material tank 6. A discharge pipe 8 is fixedly connected to the raw material tank 6. The discharge pipe 8 is connected to the membrane evaporation assembly 13. Two sets of tubular filters 2 are installed and operate alternately. The micron-level filter element 3 is made of acid-resistant filter material. The tubular filter 2, the membrane distillation system, and the flash tower 22 are supported by support columns. Solenoid valves are installed on each connecting pipe of the tubular filter 2, the membrane distillation system, and the flash tower 22. When acidic liquid flows from low to high, it is drawn by an acid-resistant liquid pump. A discharge pipe 2 10 is fixedly connected to the concentrate tank 7. The discharge pipe 2 10 is connected to the flash tower 22. The membrane evaporation assembly 13 is connected to the concentrate tank 7 through the feed pipe 2 9.

[0026] Specifically, dilute sulfuric acid enters the tubular filter 2 through the feed pipe 1, and is filtered by the micron-level filter element 3 to remove impurities from the dilute sulfuric acid. The purified dilute acid enters the raw material tank 6 through the water outlet pipe 5. The vacuum pump 17 maintains the membrane distillation system and flash tower 22 under negative pressure through the suction pipe 21. The dilute acid in the raw material tank 6 is drawn into the membrane evaporation component 13 under the action of pressure difference.

[0027] Working Principle: Dilute sulfuric acid enters the tubular filter 2 through feed pipe 1, and impurities are removed by the micron-level filter element 3. The purified dilute acid enters the raw material tank 6 through the water outlet pipe 5. The vacuum pump 17 maintains a negative pressure state in the membrane distillation system and flash tower 22 through the suction pipe 21. Under the action of pressure difference, the dilute acid in the raw material tank 6 is drawn into the membrane evaporation component 13. The concentrated liquid in the membrane evaporation component 13 is discharged into the concentrated water tank 7 through feed pipe 29. The water vapor after vaporization in the membrane evaporation component 13 passes through the distillation membrane and enters the membrane condensation component 14 through the water vapor after vaporization in the flash tower 22. It is condensed under the cold circulation system. The evaporated condensate is discharged through the fresh water drain pipe 20. The flash tower 22 is fed intermittently by liquid level control. The concentrated acid 28 enters the external discharge pump 27 through the concentrated acid pipe 11 at the bottom of the flash tower 22. The concentrated acid is then discharged through the online sulfuric acid concentration meter 29 with electromagnetic induction. The valve controls the switching of concentrated acid 28 for discharge or return to concentrated water tank 7. The cold source of the circulation system is cooling water, which enters the membrane condenser 14 and the vacuum system heat exchanger 15 in parallel through the cooling water inlet pipe 18. After heat exchange, it is discharged through the cooling water return pipe 19. The vacuum pump 17 is an acid-resistant water ring vacuum pump, which achieves cooling through the vacuum system heat exchanger 15 and the circulating water tank 16. The circulating water tank 16 contains cooling water, which is replenished and replaced regularly. The heat source of the heat circulation system is depressurized steam. The depressurized steam enters the heat circulation heat exchanger 23 through the steam pipe 25 and is discharged through the condensate pipe 26. The heat circulation pump 24 circulates the waste acid in the flash tower 22 and heats it through the heat circulation heat exchanger 23. The vacuum pump 17 draws the water vapor after vaporization in the flash tower 22, passes it through the membrane evaporation component 13, and enters the membrane condenser 14. The secondary steam of the flash tower 22 is used to heat the membrane evaporation component 13.

[0028] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A dilute acid purification and concentration system, characterized in that, include: The system includes a tubular filter (2), a membrane distillation system, and a flash distillation tower (22). The membrane distillation system includes a raw material tank (6), a concentrated water tank (7), a membrane distillation assembly (12), a vacuum pump (17), and a cold circulation system. A heat circulation system is connected to the flash distillation tower (22), which includes a heat exchanger (23) and a heat pump (24). The membrane distillation assembly (12) includes a membrane evaporation assembly (13) and a membrane condensation assembly (14). A concentrated acid pipeline (11) is fixedly connected to the bottom of the flash distillation tower (22). An external discharge pump (27) and an online sulfuric acid pump are installed on the concentrated acid pipeline (11). The concentration meter (29) contains concentrated acid (28) flowing in the concentrated acid pipeline (11), and the other end of the concentrated acid pipeline (11) is connected to the concentrated water tank (7). The vacuum pump (17) is connected to the membrane distillation system through the suction pipeline (21). The cold circulation system includes a cooling water inlet pipeline (18), a cooling water return pipeline (19), a circulating water tank (16), and a vacuum system heat exchanger (15). The cold circulation system is connected in parallel with the membrane condensation assembly (14) and the vacuum system heat exchanger (15) for heat exchange. The hot circulation system includes a depressurized steam pipeline (25) and a condensate pipeline (26).

2. The dilute acid purification and concentration system according to claim 1, characterized in that, The tubular filter (2) is filled with a micron-sized filter element (3), and a drain valve (4) is provided at the bottom of the tubular filter (2). A feed pipe (1) is fixedly connected to the top side surface of the tubular filter (2).

3. The dilute acid purification and concentration system according to claim 1, characterized in that, The bottom of the tubular filter (2) is fixedly connected to a water outlet pipe (5), and the other end of the water outlet pipe (5) is connected to the raw material tank (6).

4. The dilute acid purification and concentration system according to claim 1, characterized in that, The raw material tank (6) is fixedly connected to a discharge pipe (8), which is connected to the membrane evaporation assembly (13).

5. The dilute acid purification and concentration system according to claim 1, characterized in that, The concentrate tank (7) is fixedly connected to the discharge pipe two (10), which is connected to the flash evaporator (22). The membrane evaporation assembly (13) is connected to the concentrate tank (7) through the feed pipe two (9).

6. The dilute acid purification and concentration system according to claim 1, characterized in that, A freshwater drainage pipe (20) is provided on the membrane condensation assembly (14).

7. The dilute acid purification and concentration system according to claim 2, characterized in that, The tubular filter (2) is provided in two sets and operates alternately. The micron-level filter element (3) is made of acid-resistant filter material.

8. The dilute acid purification and concentration system according to claim 1, characterized in that, The tubular filter (2), membrane distillation system, and flash tower (22) are supported by support columns. Each connecting pipe of the tubular filter (2), membrane distillation system, and flash tower (22) is equipped with a solenoid valve, and acid-resistant liquid pumps are used to extract the acidic liquid when it flows from low to high.

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