High-concentration brine treatment system with gas-liquid separation function

Abstract

The utility model relates to the technical field of waste liquid treatment, and discloses a high-concentration brine treatment system with a gas-liquid separation function. A refrigerant heat exchanger; the water storage tank is connected with the refrigerant heat exchanger; a baffle plate is arranged between an inlet and an outlet of the intermediate tank; gas sucked by a vacuum pump firstly enters the intermediate tank, most of condensate water is deposited at the bottom of the intermediate tank, the gas flows towards an outlet of the intermediate tank and impacts on the baffle, the baffle can intercept a small part of residual condensate water, the part of condensate water flows downwards along the baffle and falls to the bottom of the intermediate tank, and the part, which is not completely condensed, in steam enters the intermediate tank. The steam can be completely condensed into water in the water storage tank so as to be stored in the water storage tank, that is, when the vacuum pump does work, water mixed in the gas can be intercepted in a distributed mode and fully condensed and collected, gas-liquid separation is achieved, and the problem that the vacuum condition of the whole system is unstable due to the fact that the steam mixed with the water flows is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste liquid treatment, in particular to a high-concentration brine treatment system with a gas-liquid separation function. 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 retrieved some existing technologies that can extract distilled water that meets the emission standards from sewage. For example, the patent publication number is CN112661219A. Its main technical means is to store cooled distilled water in a distilled water tank. When the equipment is started, water is first stored in the distilled water tank. By utilizing the water in the distilled water tank, the centrifugal water pump and the water ejector connected thereto can achieve a continuous vacuum effect, and then provide hot steam to the condensation tank through a steam device, so that the heat exchange medium in the condensation tank is heated and evaporated into a gaseous state, thereby realizing the evaporation treatment of sewage. After analysis by the applicant, the disadvantage of this technical solution is that: in the process of treating highly concentrated brine, the gas produced by evaporation and concentration contains condensed water, which can easily affect the vacuum components, resulting in unstable vacuum conditions of the highly concentrated brine treatment system, and causing incomplete condensed water collection and low steam utilization. Based on this, the utility model provides a highly concentrated brine treatment system with a gas-liquid separation function, which has a structure that can avoid the condensed water in the gas produced by the heat exchanger causing unstable vacuum conditions of the system. Utility Model Content

[0004] The purpose of this utility model is to address the deficiencies of the existing technology and provide a highly concentrated brine treatment system with a gas-liquid separation function to solve the technical problem that the condensed water in the gas produced by the heat exchanger causes unstable vacuum conditions in the system.

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

[0006] A highly concentrated brine treatment system with gas-liquid separation function, comprising:

[0007] an evaporation tank connected to the circulation component and used for evaporating and concentrating highly concentrated brine;

[0008] A refrigerant heat exchanger is connected to the circulation component, and a compressor is provided on the connecting pipeline between the two;

[0009] A water storage tank connected to the refrigerant heat exchanger, and a vacuum pump is provided on the connecting pipeline between the two; and

[0010] The intermediate tank has an outlet connected to the refrigerant heat exchanger, and the outlet of the intermediate tank is connected to the vacuum pump, and a baffle is provided between the inlet and outlet of the intermediate tank.

[0011] As a further solution of the present invention: a liquid level sensor is provided in the intermediate tank.

[0012] As a further solution of the present invention: the vacuum pump is a water ring vacuum pump.

[0013] As a further solution of the present invention: the circulation component includes a shell and tube heat exchanger connected to the evaporator, and a circulation pump arranged on the connecting pipeline between the two, the refrigerant outlet of the shell and tube heat exchanger is connected to the refrigerant inlet of the refrigerant heat exchanger, the refrigerant outlet of the refrigerant heat exchanger is connected to the compressor, and the compressor is connected to the refrigerant inlet of the shell and tube heat exchanger.

[0014] As a further solution of the present invention: a plate heat exchanger is provided on the connecting pipeline between the refrigerant outlet of the shell and tube heat exchanger and the refrigerant inlet of the refrigerant heat exchanger.

[0015] As a further solution of the present invention: the refrigerant heat exchanger is a flooded heat exchanger.

[0016] Beneficial effects of the utility model:

[0017] (1) In the present invention, the gas sucked by the vacuum pump first enters the intermediate tank. After passing through the inlet of the intermediate tank, most of the condensed water will be deposited at the bottom of the intermediate tank. The vacuum pump continues to work, and the gas will flow to the outlet of the intermediate tank and hit the baffle. The baffle can intercept the remaining small part of the condensed water. This part of the condensed water flows down along the baffle and falls to the bottom of the intermediate tank. The gas can bypass the baffle and enter the water storage tank through the outlet of the intermediate tank. The part of the steam that is not completely condensed will be completely condensed into water after contacting the atmospheric pressure in the water storage tank and will be stored in the water storage tank and finally discharged. That is, when the vacuum pump works, the water mixed in the gas can be distributedly intercepted and fully condensed and collected to achieve gas-liquid separation, avoiding the problem of unstable vacuum conditions of the entire system caused by the flow of steam mixed with water;

[0018] (2) In the present invention, when the water level in the intermediate tank reaches a threshold, it is drained, thereby avoiding the problem of excessive water being trapped and the water level being too high, which causes the steam to be entrained again when flowing through the intermediate tank, and also facilitates the reuse of condensed water;

[0019] (3) In the present invention, highly concentrated brine is input into the evaporation tank, and the circulating pump operates to cause the highly concentrated brine to circulate between the evaporation tank and the shell-and-tube heat exchanger, which can effectively avoid the problem of excessive evaporation and concentration of the highly concentrated brine in the evaporation tank, resulting in the deposition of impurities at the bottom of the evaporation tank, thereby improving the stability of the system. 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. Circulation pump; 4. Refrigerant heat exchanger; 5. Compressor; 6. Water storage tank; 7. Vacuum pump; 8. Intermediate tank; 9. 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 high-concentration brine treatment system with gas-liquid separation function, comprising:

[0025] The evaporation tank 1 is connected to the circulation component and is used for evaporating and concentrating the highly concentrated brine;

[0026] The refrigerant heat exchanger 4 is connected to the circulation component, and a compressor 5 is provided on the connecting pipeline between the two;

[0027] A water storage tank 6 is connected to the refrigerant heat exchanger 4, and a vacuum pump 7 is provided on the connecting pipeline between the two; and

[0028] The outlet of the intermediate tank 8 is connected to the refrigerant heat exchanger 4 , and the outlet of the intermediate tank 8 is connected to the vacuum pump 7 . A baffle is provided between the inlet and outlet of the intermediate tank 8 .

[0029] In actual application of this embodiment, highly concentrated brine is input into the evaporation tank 1, and the circulation component allows the highly concentrated brine to circulate. At the same time, the water storage tank 6 cooperates with the vacuum pump 7 to evacuate the system, so that a vacuum environment is formed in the evaporation tank 1, the circulation component, the refrigerant heat exchanger 4, the compressor 5 and the intermediate tank 8. The boiling point of the liquid is reduced, and the hot refrigerant that has absorbed the heat of the compressor 5 is input into the circulation component. The hot refrigerant exchanges heat with the circulating highly concentrated brine to produce steam and concentrated liquid, and the hot refrigerant undergoes a phase change to become 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 perform work, and then enters the evaporation tank 1 to perform concentration and evaporation in this circulation manner. Considering that the gas absorbed when the vacuum pump 7 performs work cannot contain liquid, but the steam generated in the evaporation tank 1 passes through the refrigerant heat exchanger 4, it will be mixed with condensed water. The gas sucked by the vacuum pump 7 first enters the intermediate tank 8. After passing through the inlet of the intermediate tank 8, most of the condensed water will be deposited at the bottom of the intermediate tank 8. The vacuum pump 7 continues to work, and the gas will flow to the outlet of the intermediate tank 8 and hit the baffle. The baffle can intercept the remaining small part of condensed water. This part of condensed water flows down along the baffle and falls to the bottom of the intermediate tank 8. The gas can bypass the baffle and enter the water storage tank 6 through the outlet of the intermediate tank 8. Moreover, the part of the steam that is not completely condensed will be completely condensed into water after contacting the atmospheric pressure in the water storage tank 6 and thus be stored in the water storage tank 6 and finally discharged. That is, when the vacuum pump 7 works, the water mixed in the gas can be distributedly intercepted and fully condensed and collected, thereby realizing gas-liquid separation and avoiding the problem of unstable vacuum conditions of the entire system caused by the flow of steam mixed with water.

[0030] like Figure 1 As shown, as a preferred embodiment of the present invention, a liquid level sensor is provided in the intermediate tank 8; in actual application, when the level of the water intercepted in the intermediate tank 8 reaches a threshold value, it is emptied to avoid the problem of excessive intercepted water and excessively high liquid level causing the steam to carry water again when flowing through the intermediate tank 8, and also facilitate the reuse of condensed water.

[0031] like Figure 1 As shown, as a preferred embodiment of the present invention, the vacuum pump 7 is a water ring vacuum pump; in actual application, no ejector is required, which reduces the production cost of the high-concentration brine treatment system.

[0032] like Figure 1 As shown, as a preferred embodiment of the present invention, the circulation component includes a shell and tube heat exchanger 2 connected to the evaporator 1, and a circulation pump 3 arranged on the connecting pipeline between the two, the refrigerant outlet of the shell and tube heat exchanger 2 is connected to the refrigerant inlet of the refrigerant heat exchanger 4, the refrigerant outlet of the refrigerant heat exchanger 4 is connected to the compressor 5, and the compressor 5 is connected to the refrigerant inlet of the shell and tube heat exchanger 2.

[0033] In actual application, the highly concentrated brine is fed into the evaporation tank 1, and the circulation pump 3 operates to circulate the highly concentrated brine between the evaporation tank 1 and the shell-and-tube heat exchanger 2. This effectively prevents the highly concentrated brine from evaporating excessively in the evaporation tank 1, thereby preventing impurities from being deposited at the bottom of the evaporation tank 1. This improves the stability of the system.

[0034] like Figure 1 As shown, as a preferred embodiment of the present invention, a plate heat exchanger 9 is provided on the connecting pipeline between the refrigerant outlet of the shell and tube heat exchanger 2 and the refrigerant inlet of the refrigerant heat exchanger 4.

[0035] In actual application of this embodiment, the plate heat exchanger 9 is connected to the drying filter, the solenoid valve and the electronic expansion valve to form a hot gas bypass pipeline. In 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.

[0036] like Figure 1 As shown, as a preferred embodiment of the present invention, the refrigerant heat exchanger 4 is a flooded heat exchanger.

[0037] Working principle of the present invention: The above embodiment of the present invention provides a high-concentration brine treatment system with gas-liquid separation function, the gas sucked by the vacuum pump 7 first enters the intermediate tank 8, and after passing through the inlet of the intermediate tank 8, most of the condensed water will be deposited at the bottom of the intermediate tank 8, the vacuum pump 7 continues to work, the gas will flow to the outlet of the intermediate tank 8, and hit the baffle, the baffle can intercept the remaining small part of the condensed water, this part of the condensed water flows down along the baffle and falls to the bottom of the intermediate tank 8, the gas can bypass the baffle and enter the water storage tank 6 through the outlet of the intermediate tank 8, and the part of the steam that is not completely condensed will be completely condensed into water after contacting the atmospheric pressure in the water storage tank 6, and thus be stored in the water storage tank 6, and finally discharged, that is, when the vacuum pump 7 works, the water mixed in the gas can be distributedly intercepted and fully condensed and collected, thereby realizing gas-liquid separation, avoiding the problem of unstable vacuum conditions of the entire system caused by the flow of steam mixed with water.

[0038] 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 highly concentrated brine treatment system with gas-liquid separation function, characterized in that: include: An evaporation tank (1) is connected to the circulation component and is used for evaporating and concentrating highly concentrated brine; A refrigerant heat exchanger (4) is connected to the circulation component, and a compressor (5) is provided on the connecting pipeline between the two; A water storage tank (6) is connected to the refrigerant heat exchanger (4), and a vacuum pump (7) is provided on the connecting pipeline between the two; and The intermediate tank (8) has an outlet connected to the refrigerant heat exchanger (4), and the outlet of the intermediate tank (8) is connected to the vacuum pump (7). A baffle is provided between the inlet and outlet of the intermediate tank (8).

2. The highly concentrated brine treatment system with gas-liquid separation function according to claim 1 is characterized in that: A liquid level sensor is provided in the intermediate tank (8).

3. The highly concentrated brine treatment system with gas-liquid separation function according to claim 1 is characterized in that: The vacuum pump (7) is a water ring vacuum pump.

4. The highly concentrated brine treatment system with gas-liquid separation function according to claim 1, characterized in that: The circulation component comprises a shell and tube heat exchanger (2) connected to an evaporation tank (1), and a circulation pump (3) arranged on a pipeline connecting the two, the refrigerant outlet of the shell and tube heat exchanger (2) is connected to the refrigerant inlet of a refrigerant heat exchanger (4), the refrigerant outlet of the refrigerant heat exchanger (4) is connected to a compressor (5), and the compressor (5) is connected to the refrigerant inlet of the shell and tube heat exchanger (2).

5. The highly concentrated brine treatment system with gas-liquid separation function according to claim 4 is characterized in that: A plate heat exchanger (9) is provided on the connecting pipeline between the refrigerant outlet of the shell and tube heat exchanger (2) and the refrigerant inlet of the refrigerant heat exchanger (4).

6. The highly concentrated brine treatment system with gas-liquid separation function according to claim 1, characterized in that: The refrigerant heat exchanger (4) is a flooded heat exchanger.

Images