Steam treatment system of high-concentration brine evaporation tank

Abstract

The utility model relates to the technical field of waste liquid treatment, and discloses a steam treatment system of a high-concentration brine evaporation tank. A refrigerant heat exchanger; a steam discharge pipeline of the evaporation tank is a Y-shaped pipeline, and two outlets of the steam discharge pipeline are respectively connected with a steam inlet of the refrigerant heat exchanger and a steam inlet of the steam heat exchanger; a water storage tank; and a cooling unit. Steam after heat exchange in the refrigerant heat exchanger and the steam heat exchanger can be discharged into the water storage tank to be condensed and collected, meanwhile, cooling water after the cooling unit does work is input into the steam heat exchanger and the water storage tank through the cooling water inlet pipe, the condensation efficiency of the steam in the steam heat exchanger and the water storage tank can be improved, and it is guaranteed that the steam is fully condensed and fully utilized; cooling water subjected to heat exchange in the steam heat exchanger and the water storage tank is input into the cooling unit through a cooling water outlet pipe to be cooled.

Description

Technical Field

[0001] The utility model relates to the technical field of waste liquid treatment, in particular to a steam treatment system of a high-concentration brine evaporation tank. Background Art

[0002] Media have different boiling points at different pressures. Under low pressure or even vacuum conditions, the boiling point of water decreases, making it easier to evaporate at low temperatures. Evaporators, based on this principle, concentrate and reduce wastewater discharge or concentrate and purify liquids to be treated. Vacuum evaporators are important chemical equipment. Vacuum evaporation is performed under vacuum. Low pressure lowers the boiling point of the solution and evaporates large amounts of water with less steam. This process can be used to treat heat-sensitive materials that easily decompose at high temperatures. It is often used for product separation and concentration, and is widely used in wastewater treatment, pharmaceutical equipment, and industry.

[0003] The applicant has identified several prior arts that can extract distilled water from wastewater that meets discharge standards, such as patent publication number CN112661219A. Its primary technical approach involves compressing a gaseous heat exchange medium into a liquid state through a compressor, releasing a large amount of heat that enters a first heat exchanger, thereby heating the waste liquid in the evaporator. The heat exchange medium then absorbs a significant amount of heat through the throttling action of an expansion valve before entering a second heat exchanger, thereby cooling the steam in the condenser. After absorbing the heat from the steam, the heat exchange medium reforms into a gaseous state and enters the compressor for recirculation. Analysis by the applicant reveals a drawback of this technical solution: condensing steam through only one heat exchanger results in a low condensed steam volume, which prevents full condensation and condensed water utilization. Consequently, the present invention provides a steam treatment system for a high-concentration brine evaporator that can fully condense and process the steam generated by evaporation and concentration, while also providing sufficient work for the liquid refrigerant. Utility Model Content

[0004] The purpose of the utility model is to address the deficiencies of the prior art and provide a steam treatment system for a high-concentration brine evaporation tank to solve the technical problem of insufficient condensation caused by a single heat exchanger condensing steam.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A steam treatment system for a high-concentration brine evaporation tank, comprising:

[0007] An evaporation tank is provided with a raw liquid inlet for inputting highly concentrated brine, the liquid outlet on the evaporation tank is connected to the liquid inlet of the tube-and-tube heat exchanger, and the liquid inlet on the evaporation tank is connected to the liquid outlet of the tube-and-tube heat exchanger, and a circulating pump is provided on the connecting pipeline between the liquid inlet on the evaporation tank and the liquid outlet of the tube-and-tube heat exchanger;

[0008] A refrigerant heat exchanger, wherein the refrigerant inlet of the refrigerant heat exchanger is connected to the refrigerant outlet of the shell and tube heat exchanger, the refrigerant outlet of the refrigerant heat exchanger is connected to the refrigerant inlet of the shell and tube heat exchanger, and a compressor is provided on the connecting pipeline between the refrigerant outlet of the refrigerant heat exchanger and the refrigerant inlet of the shell and tube heat exchanger;

[0009] A steam heat exchanger, wherein the steam exhaust pipeline of the evaporator is a Y-shaped pipeline, and the two outlets of the steam exhaust pipeline are respectively connected to the steam inlet of the refrigerant heat exchanger and the steam inlet of the steam heat exchanger;

[0010] a water storage tank connected to the steam outlet of the refrigerant heat exchanger and the steam outlet of the steam heat exchanger, and connected to the vacuum assembly; and

[0011] A cooling unit is connected to a cooling water outlet pipe and a cooling water inlet pipe, the cooling water outlet pipe is provided with a first interface and a second interface, the first interface is connected to the cooling outlet on the water storage tank, and the second interface is connected to the cooling outlet on the steam heat exchanger, the cooling water inlet pipe is provided with a third interface and a fourth interface, the third interface is connected to the cooling inlet on the water storage tank, and the fourth interface is connected to the cooling inlet on the steam heat exchanger.

[0012] As a further solution of the present invention: the shell and tube heat exchanger is connected to the plate heat exchanger, and the cooling water outlet pipe is connected to the cooling outlet of the plate heat exchanger, and the cooling inlet of the plate heat exchanger is connected to the cooling water inlet pipe.

[0013] As a further solution of the present invention: the refrigerant heat exchanger is an immersion heat exchanger, which is provided with a steam pipe for flowing steam, and the steam pipe is immersed in the refrigerant inside the refrigerant heat exchanger.

[0014] As a further solution of the present invention: a sight glass is provided on the refrigerant heat exchanger.

[0015] As a further solution of the present invention: the connecting pipeline between the liquid feed inlet on the evaporation tank and the liquid feed outlet of the tube-in-tube heat exchanger is connected to a centrifuge.

[0016] Beneficial effects of the utility model:

[0017] (1) In the present invention, the steam generated in the evaporation tank is input into the refrigerant heat exchanger for heat exchange, and the remaining steam exceeding the processing capacity of the refrigerant heat exchanger is input into the steam heat exchanger for heat exchange, so as to improve the steam processing capacity of the evaporation processing system and the efficiency of condensing the steam. The steam after heat exchange in the refrigerant heat exchanger and the steam heat exchanger is discharged into the water storage tank for condensation and collection. At the same time, the cooling water after the cooling unit works is input into the steam heat exchanger and the water storage tank through the cooling water inlet pipe, which can improve the condensation efficiency of the steam in the steam heat exchanger and the water storage tank, and ensure that the steam is fully condensed and fully utilized; the cooling water after heat exchange in the steam heat exchanger and the water storage tank is input into the cooling unit through the cooling water outlet pipe for cooling, and then input into the steam heat exchanger and the water storage tank through the cooling water inlet pipe, so that the system can perform circulating cooling;

[0018] (2) In the present invention, the cooling unit inputs cooling water to the plate heat exchanger through the cooling water inlet pipe to ensure the performance of the plate heat exchanger, maintain the low pressure of the system, and ensure the stable operation of the system. The cooling water after heat exchange is input into the cooling unit through the cooling water outlet pipe for cooling treatment;

[0019] (3) In the present invention, the height of the sight glass on the surface of the refrigerant heat exchanger is half the height of its inner cavity. The refrigerant liquid level inside the refrigerant heat exchanger is controlled at half the height of the inner cavity by observing the sight glass, and the height of the steam pipe is set to be lower than the height of the refrigerant liquid level. When in use, the steam pipe is immersed in the refrigerant, and the refrigerant liquid level just submerges the steam pipe, which can avoid the refrigerant liquid level being too low, resulting in part of the steam in the steam pipe being unable to be fully condensed. At the same time, it can avoid the refrigerant liquid level being too high, which can cause the compressor to entrain too much incompletely vaporized liquid refrigerant and steam condensate when sucking in the refrigerant. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0022] In the figure: 1. Evaporator; 2. Shell and tube heat exchanger; 3. Circulating pump; 4. Refrigerant heat exchanger; 5. Compressor; 6. Steam heat exchanger; 7. Water storage tank; 8. Cooling water outlet pipe; 9. Cooling water inlet pipe; 10. Cooling unit; 11. First interface; 12. Second interface; 13. Third interface; 14. Fourth interface; 15. Plate heat exchanger. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] See also Figure 1 As shown, the utility model is a steam treatment system for a high-concentration brine evaporation tank, comprising:

[0025] An evaporation tank 1 is provided with a raw liquid inlet for inputting highly concentrated brine. The liquid outlet on the evaporation tank 1 is connected to the liquid inlet of the shell and tube heat exchanger 2, and the liquid inlet on the evaporation tank 1 is connected to the liquid outlet of the shell and tube heat exchanger 2. A circulating pump 3 is provided on the connecting pipeline between the liquid inlet on the evaporation tank 1 and the liquid outlet of the shell and tube heat exchanger 2.

[0026] A refrigerant heat exchanger 4, whose refrigerant inlet is connected to the refrigerant outlet of the shell and tube heat exchanger 2, and whose refrigerant outlet is connected to the refrigerant inlet of the shell and tube heat exchanger 2, and a compressor 5 is provided on the connecting pipeline between the refrigerant outlet of the refrigerant heat exchanger 4 and the refrigerant inlet of the shell and tube heat exchanger 2;

[0027] The steam heat exchanger 6, the steam exhaust pipeline of the evaporation tank 1 is a Y-shaped pipeline, and the two outlets of the steam exhaust pipeline are respectively connected to the steam inlet of the refrigerant heat exchanger 4 and the steam inlet of the steam heat exchanger 6;

[0028] a water storage tank 7 connected to the steam outlet of the refrigerant heat exchanger 4 and the steam outlet of the steam heat exchanger 6, and connected to the vacuum assembly; and

[0029] The cooling unit 10 is connected to a cooling water outlet pipe 8 and a cooling water inlet pipe 9. The cooling water outlet pipe 8 is provided with a first interface 11 and a second interface 12. The first interface 11 is connected to the cooling outlet on the water storage tank 7, and the second interface 12 is connected to the cooling outlet on the steam heat exchanger 6. The cooling water inlet pipe 9 is provided with a third interface 13 and a fourth interface 14. The third interface 13 is connected to the cooling inlet on the water storage tank 7, and the fourth interface 14 is connected to the cooling inlet on the steam heat exchanger 6.

[0030] In one case of this embodiment, the vacuum component may be a vacuum centrifugal pump or a water ring vacuum component, as long as a negative pressure environment can be achieved. This embodiment does not make any specific restrictions here.

[0031] In actual application of this embodiment, the vacuum component is used to make the entire system a negative pressure environment, and the highly concentrated brine is input into the evaporation tank 1. The circulating pump 3 works to make the highly concentrated brine circulate between the evaporation tank 1 and the tube-and-tube heat exchanger 2. The hot refrigerant after the compressor 5 works enters the tube-and-tube heat exchanger 2 to exchange heat with the highly concentrated brine, generating steam and concentrated liquid, and the hot refrigerant undergoes a phase change to become a liquid refrigerant. The liquid refrigerant is input into the refrigerant heat exchanger 4 for heat exchange. The refrigerant after heat exchange is input into the compressor 5 to work, and then enters the evaporation tank 1 for concentration and evaporation in this cycle. The steam generated in the evaporation tank 1 is input into the refrigerant heat exchanger 4 for heat exchange. The remaining steam exceeding the processing capacity of the refrigerant heat exchanger 4 will be input into the steam Heat exchange is carried out in the heat exchanger 6 to increase the amount of steam processed by the evaporation treatment system and the efficiency of condensing steam. The steam after heat exchange in the refrigerant heat exchanger 4 and the steam heat exchanger 6 will be discharged into the water storage tank 7 for condensation and collection. At the same time, the cooling water after work of the cooling unit 10 is input into the steam heat exchanger 6 and the water storage tank 7 through the cooling water inlet pipe 9, which can improve the condensation efficiency of the steam in the steam heat exchanger 6 and the water storage tank 7, and ensure that the steam is fully condensed and fully utilized; the cooling water after heat exchange in the steam heat exchanger 6 and the water storage tank 7 is input into the cooling unit 10 through the cooling water outlet pipe 8 for cooling, and then input into the steam heat exchanger 6 and the water storage tank 7 through the cooling water inlet pipe 9, so that the system can perform circulating cooling.

[0032] like Figure 1 As shown, as a preferred embodiment of the present invention, the shell and tube heat exchanger 2 is connected to the plate heat exchanger 15, and the cooling water outlet pipe 8 is connected to the cooling outlet of the plate heat exchanger 15, and the cooling inlet of the plate heat exchanger 15 is connected to the cooling water inlet pipe 9.

[0033] In one case of this embodiment, the plate heat exchanger 15 is connected to the drying filter, the solenoid valve and the electronic expansion valve to form a hot gas bypass pipeline. During the preheating stage, there is no steam in the refrigerant heat exchanger 4 for heat exchange with the refrigerant, and the system low pressure will become lower and lower. When the low pressure is lower than the protection value, the solenoid valve of the bypass pipeline opens, bypassing a part of the exhaust gas for heat exchange with the low-temperature and low-pressure refrigerant after throttling by the electronic expansion valve, so as to maintain the low pressure of the system and ensure stable operation of the system.

[0034] In actual application of this embodiment, the cooling unit 10 inputs cooling water to the plate heat exchanger 15 through the cooling water inlet pipe 9 to ensure the performance of the plate heat exchanger 15. The cooling water after heat exchange is input into the cooling unit 10 through the cooling water outlet pipe 8 for cooling treatment.

[0035] like Figure 1 As shown, as a preferred embodiment of the present invention, the refrigerant heat exchanger 4 is an immersion heat exchanger, in which a steam pipe for flowing steam is provided, and the steam pipe is immersed in the refrigerant inside the refrigerant heat exchanger 4.

[0036] In one aspect of this embodiment, a sight glass is provided on the refrigerant heat exchanger 4 .

[0037] In actual application of this embodiment, the height of the sight glass on the surface of the refrigerant heat exchanger 4 is half of the height of its inner cavity. The refrigerant liquid level inside the refrigerant heat exchanger 4 is controlled at half of the inner cavity height by observing the sight glass, and the steam pipe height is set to be lower than the refrigerant liquid level. When in use, the steam pipe is soaked in the refrigerant, and the refrigerant liquid level just submerges the steam pipe, which can avoid the refrigerant liquid level being too low, resulting in part of the steam in the steam pipe being unable to be fully condensed. At the same time, it can avoid the refrigerant liquid level being too high, and the compressor 5 entraining too much incompletely vaporized liquid refrigerant and steam condensate when inhaling the refrigerant.

[0038] like Figure 1 As shown, as a preferred embodiment of the present invention, the connecting pipeline between the liquid inlet on the evaporation tank 1 and the liquid outlet of the shell and tube heat exchanger 2 is connected to the centrifuge.

[0039] In actual application of this embodiment, when the highly concentrated brine is evaporated and concentrated to the point where salt separation is imminent, the solenoid valve on the connecting pipe between the liquid inlet on the evaporation tank 1 and the liquid outlet on the shell-and-tube heat exchanger 2 is opened, so that the liquid can be discharged into the centrifuge for salt separation, thereby avoiding the problem of excessive salt precipitation in the steam treatment system leading to serious precipitation in the equipment.

[0040] Working principle of the present invention: The above embodiment of the present invention provides a steam treatment system for a high-concentration brine evaporation tank, wherein the steam generated in the evaporation tank 1 is input into the refrigerant heat exchanger 4 for heat exchange, and the remaining steam exceeding the processing capacity of the refrigerant heat exchanger 4 will be input into the steam heat exchanger 6 for heat exchange, so as to improve the steam processing capacity of the evaporation treatment system and the efficiency of condensing steam. The steam after heat exchange in the refrigerant heat exchanger 4 and the steam heat exchanger 6 will be discharged into the water storage tank 7 for condensation and collection. At the same time, the cooling water after work of the cooling unit 10 is input into the steam heat exchanger 6 and the water storage tank 7 through the cooling water inlet pipe 9, which can improve the condensation efficiency of the steam in the steam heat exchanger 6 and the water storage tank 7, and ensure that the steam is fully condensed and fully utilized; the cooling water after heat exchange in the steam heat exchanger 6 and the water storage tank 7 is input into the cooling unit 10 through the cooling water outlet pipe 8 for cooling, and then input into the steam heat exchanger 6 and the water storage tank 7 through the cooling water inlet pipe 9, so that the system can perform circulating cooling.

[0041] The above describes an embodiment of the present invention in detail. However, the above content is only a preferred embodiment of the present invention and should not be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent application of the present invention.

Claims

1. A steam treatment system for a high-concentration brine evaporation tank, characterized in that: include: An evaporation tank (1) is provided with a raw liquid inlet for inputting highly concentrated brine, a liquid outlet on the evaporation tank (1) is connected to a liquid inlet of a shell-and-tube heat exchanger (2), and the liquid inlet on the evaporation tank (1) is connected to a liquid outlet of the shell-and-tube heat exchanger (2), and a circulation pump (3) is provided on the connecting pipeline between the liquid inlet on the evaporation tank (1) and the liquid outlet of the shell-and-tube heat exchanger (2); A refrigerant heat exchanger (4), the refrigerant inlet of which is connected to the refrigerant outlet of the shell-and-tube heat exchanger (2), the refrigerant outlet of which is connected to the refrigerant inlet of the shell-and-tube heat exchanger (2), and a compressor (5) is provided on the connecting pipeline between the refrigerant outlet of the refrigerant heat exchanger (4) and the refrigerant inlet of the shell-and-tube heat exchanger (2); A steam heat exchanger (6), wherein the steam discharge pipeline of the evaporation tank (1) is a Y-shaped pipeline, and the two outlets of the steam discharge pipeline are respectively connected to the steam inlet of the refrigerant heat exchanger (4) and the steam inlet of the steam heat exchanger (6); a water storage tank (7), which is connected to the steam outlet of the refrigerant heat exchanger (4) and the steam outlet of the steam heat exchanger (6), and is connected to the vacuum component; and A cooling unit (10) is connected to a cooling water outlet pipe (8) and a cooling water inlet pipe (9); the cooling water outlet pipe (8) is provided with a first interface (11) and a second interface (12); the first interface (11) is connected to the cooling outlet on the water storage tank (7), and the second interface (12) is connected to the cooling outlet on the steam heat exchanger (6); the cooling water inlet pipe (9) is provided with a third interface (13) and a fourth interface (14); the third interface (13) is connected to the cooling inlet on the water storage tank (7), and the fourth interface (14) is connected to the cooling inlet on the steam heat exchanger (6).

2. The steam treatment system of a high-concentration brine evaporation tank according to claim 1, characterized in that: The shell and tube heat exchanger (2) is connected to the plate heat exchanger (15), and the cooling water outlet pipe (8) is connected to the cooling outlet of the plate heat exchanger (15), and the cooling inlet of the plate heat exchanger (15) is connected to the cooling water inlet pipe (9).

3. The steam treatment system of a high-concentration brine evaporation tank according to claim 1, characterized in that: The refrigerant heat exchanger (4) is an immersed heat exchanger, in which a steam pipe for flowing steam is provided, and the steam pipe is immersed in the refrigerant inside the refrigerant heat exchanger (4).

4. The steam treatment system of a high-concentration brine evaporation tank according to claim 3, characterized in that: The refrigerant heat exchanger (4) is provided with a sight glass.

5. The steam treatment system of a high-concentration brine evaporation tank according to claim 1, characterized in that: The connecting pipeline between the liquid feed inlet on the evaporation tank (1) and the liquid feed outlet of the tube-in-tube heat exchanger (2) is connected to the centrifuge.

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