MVR wastewater treatment system

Abstract

The utility model relates to the technical field of wastewater treatment, and particularly discloses an MVR wastewater treatment system which comprises a separator, a compressor, a heater, a preheater and a wastewater pipe, the wastewater pipe passes through the preheater and is connected with the separator; a steam outlet of the separator is connected with an inlet of the compressor; an outlet of the compressor is connected with a steam inlet of the heater; a steam outlet of the heater is connected with a steam inlet of the separator; a distilled water outlet of the heater is connected with a water inlet end of a water outlet pipe; and the water outlet pipe passes through the preheater. According to the scheme, distilled water generated by the heater can flow through the preheater to preheat wastewater entering the separator, so that the heat of the distilled water is utilized, and the energy utilization rate of the whole system is improved.

Description

Technical Field

[0001] This application relates to the technical field of wastewater treatment, and particularly to an MVR wastewater treatment system. Background Art

[0002] MVR is the abbreviation of mechanical vapor recompression technology. Correspondingly, an MVR wastewater treatment system is a device that heats wastewater by introducing steam into a separator, evaporates the water in the wastewater, and then pumps the concentrated liquid left in the wastewater into a crystallization kettle for crystallization into salt for recovery.

[0003] Existing MVR wastewater treatment systems generally include a heater, a separator, and a compressor; the compressor compresses steam and then sends the steam into the heater to exchange heat with the wastewater; the wastewater after heat exchange enters the separator and is separated into steam and concentrated liquid. However, in existing MVR wastewater treatment systems, the distilled water after heat exchange is generally directly discharged or stored, resulting in low energy utilization efficiency. Summary of the Utility Model

[0004] In view of this, the purpose of this application is to provide an MVR wastewater treatment system to solve the problem of low energy utilization efficiency of existing MVR wastewater treatment systems.

[0005] To achieve the above technical purpose, this application provides an MVR wastewater treatment system, including: a separator, a compressor, a heater, a preheater, and a wastewater pipe;

[0006] The wastewater pipe passes through the preheater and the wastewater pipe is connected to the separator;

[0007] The steam outlet of the separator is connected to the inlet of the compressor;

[0008] The outlet of the compressor is connected to the steam inlet of the heater;

[0009] The steam outlet of the heater is connected to the steam inlet of the separator;

[0010] The distilled water outlet of the heater is connected to a water outlet pipe;

[0011] The water outlet pipe passes through the preheater.

[0012] Further, the circulating discharge port of the separator is connected to the material inlet of the heater through a circulation pipe;

[0013] The material outlet of the heater is connected to the circulating inlet of the separator;

[0014] A forced circulation pump is provided on the circulation pipe;

[0015] The described circulating discharge port is used for the concentrated liquid to flow out.

[0016] Furthermore, it further includes a crystallization kettle and a controller;

[0017] The discharge port of the separator is connected to the crystallization kettle;

[0018] A discharge valve is provided at the discharge port of the separator;

[0019] A concentration monitor is provided inside the separator;

[0020] Both the concentration monitor and the discharge valve are electrically connected to the controller.

[0021] Furthermore, it further includes a secondary separator;

[0022] The steam outlet of the separator is connected to the secondary separator;

[0023] The return port of the secondary separator is connected to the separator;

[0024] The steam outlet of the secondary separator is connected to the inlet of the compressor.

[0025] Furthermore, a temperature monitor is provided inside the separator;

[0026] A return valve is provided at the return port of the secondary separator;

[0027] Both the temperature monitor and the return valve are electrically connected to the controller;

[0028] The controller is used to close the return valve after the temperature monitor monitors that the temperature inside the separator reaches the preset temperature.

[0029] Furthermore, it further includes: a steam pipe;

[0030] The steam pipe is connected to the inlet of the compressor.

[0031] Furthermore, the steam pipe is connected to the separator through a branch pipe;

[0032] A steam valve is provided on the branch pipe.

[0033] Furthermore, the water outlet end of the water outlet pipe is connected to the cooling gland seal of the compressor.

[0034] Furthermore, a distilled water storage tank is provided on the water outlet pipe;

[0035] The distilled water storage tank is arranged between the preheater and the heater.

[0036] Furthermore, it further includes: a distilled water storage tank;

[0037] The water outlet end of the water outlet pipe is connected to the water inlet end of the distilled water storage tank.

[0038] As can be seen from the above technical solutions, the present application provides an MVR wastewater treatment system, including: a separator, a compressor, a heater, a preheater and a wastewater pipe; the wastewater pipe passes through the preheater and the wastewater pipe is connected to the separator; the steam outlet of the separator is connected to the inlet of the compressor; the outlet of the compressor is connected to the steam inlet of the heater; the steam outlet of the heater is connected to the steam inlet of the separator; the distilled water outlet of the heater is connected to the water inlet end of a water outlet pipe; the water outlet pipe passes through the preheater.

[0039] In this solution, the distilled water generated by the heater can flow through the preheater to preheat the wastewater entering the separator, realizing the utilization of the heat of the distilled water and thus improving the energy utilization rate of the overall system. Description of the Drawings

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1 It is a wireframe schematic diagram of an MVR wastewater treatment system provided by an embodiment of the present application;

[0042] In the figure:

[0043] 10. Separator; 11. Circulation pipe; 12. Discharge valve; 13. Concentration monitor; 14. Temperature monitor;

[0044] 20. Compressor;

[0045] 30. Heater; 31. Water outlet pipe;

[0046] 40. Preheater; 41. Water pump; 42. Distilled water temporary storage tank;

[0047] 50. Wastewater pipe; 51. Wastewater pump;

[0048] 60. Wastewater tank;

[0049] 70. Forced circulation pump;

[0050] 80. Crystallizer; 81. Cooling water inlet pipe; 82. Cooling water outlet pipe;

[0051] 90. Secondary separator; 91. Return valve;

[0052] 100, distilled water storage tank;

[0053] 110, steam pipe; 111, branch pipe; 112, steam valve. Specific embodiments

[0054] The technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the specification of the present application without creative efforts belong to the scope claimed by the present application.

[0055] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the embodiments of the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0056] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a replaceable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0057] Please refer to Figure 1 , a MVR wastewater treatment system provided in the embodiments of the present application, including: a separator 10, a compressor 20, a heater 30, a preheater 40, and a wastewater pipe 50.

[0058] The wastewater pipe 50 is used for the inflow of wastewater. Among them, the wastewater pipe 50 can be connected to the wastewater tank 60 through a wastewater pump 51. The wastewater tank 60 serves to store wastewater. The wastewater pipe 50 passes through the preheater 40 and the wastewater pipe 50 is connected to the separator 10, so that the wastewater in the wastewater pipe 50 can flow through the preheater 40 and then enter the separator 10.

[0059] The steam outlet of the separator 10 is connected to the inlet of the compressor 20; the outlet of the compressor 20 is connected to the steam inlet of the heater 30; the steam outlet of the heater 30 is connected to the steam inlet of the separator 10. Wastewater enters the separator 10 and is heated and separated into steam and concentrated liquid; among them, the steam can enter the compressor 20 to be compressed into high-temperature and high-pressure gas, and then enter the separator 10 through the heater 30 to heat the wastewater.

[0060] The distilled water outlet of the heater 30 is connected with a water outlet pipe 31; the water outlet pipe 31 passes through the preheater 40, so that the distilled water generated in the heater 30 can pass through the preheater 40 to preliminarily preheat the wastewater, improving the utilization rate of the heat of this part of the distilled water.

[0061] It should be noted that the heater 30 is used to exchange heat with the steam generated by the compressor 20, and higher-temperature distilled water will be generated after heat exchange.

[0062] As an implementation manner, the heat exchange object of the heater 30 can be wastewater. That is, the wastewater pipe 50 passes through the heater 30, so that the compressed high-temperature and high-pressure steam heats the wastewater for the second time in the heater 30.

[0063] In another implementation manner, the circulating discharge port of the separator 10 is connected to the material inlet of the heater 30 through a circulating pipe 11; the material outlet of the heater 30 is connected to the circulating inlet of the separator 10; a forced circulation pump 70 is arranged on the circulating pipe 11; the circulating discharge port is used for the concentrated liquid to flow out.

[0064] Specifically, in this embodiment, the concentrated liquid in the separator 10 will continuously pass through the circulating pipe 11 and the forced circulation pump 70 and be pumped into the heater 30, and then re-enter the separator 10 to realize circulating heat exchange, ensuring the temperature in the separator 10 and ensuring the separation effect on the wastewater.

[0065] In a more specific embodiment, it further includes a crystallization kettle 80 and a controller; the discharge port of the separator 10 is connected to the crystallization kettle 80; a discharge valve 12 is arranged on the discharge port of the separator 10; a concentration monitor 13 is arranged in the separator 10; both the concentration monitor 13 and the discharge valve 12 are electrically connected to the controller.

[0066] The crystallization kettle 80 is simultaneously connected with a cooling water inlet pipe 81 and a cooling water outlet pipe 82. A cooling valve is arranged on the cooling water outlet pipe 82; the concentration monitor 13 is used to monitor the concentration of the concentrated liquid in the separator 10. When the concentration of the concentrated liquid in the separator 10 reaches the preset value, the controller controls the discharge valve 12 to open, and then the concentrated liquid is discharged into the crystallization kettle 80 for cooling and crystallization.

[0067] Furthermore, a liquid level monitor can be arranged inside the crystallization kettle 80; the liquid level in the crystallization kettle 80 can be monitored through the liquid level monitor.

[0068] When the concentration monitor 13 on the separator 10 detects that the concentrated liquid in the separator 10 does not reach the preset concentration or when the crystallization kettle 80 is at a high liquid level, the discharge valve 12 automatically closes; when the concentration monitor 13 on the separator 10 detects that the concentrated liquid in the separator 10 reaches the preset concentration or when the crystallization kettle 80 is at a low liquid level, the discharge valve 12 automatically opens.

[0069] When the crystallization kettle 80 is at a high liquid level, the cooling valve automatically opens to introduce cooling water into the jacket of the crystallization kettle 80 for cooling crystallization; when the crystallization kettle 80 is at a low liquid level, the cooling valve automatically closes.

[0070] In one embodiment, the steam outlet of the separator 10 is connected to the secondary separator 90; the return port of the secondary separator 90 is connected to the separator 10; the steam outlet of the secondary separator 90 is connected to the inlet of the compressor 20.

[0071] When the temperature in the separator 10 does not reach the preset temperature, the steam discharged from the separator 10 may condense in the pipeline; for this reason, in this embodiment, the secondary separator 90 is provided to allow some steam to condense and prevent the compressor 20 from receiving liquid.

[0072] Furthermore, a temperature monitor 14 is provided inside the separator 10; a return valve 91 is provided at the return port of the secondary separator 90; both the temperature monitor 14 and the return valve 91 are electrically connected to the controller; the controller is configured to close the return valve 91 after the temperature monitor 14 detects that the temperature inside the separator 10 reaches the preset temperature.

[0073] Specifically, the preset temperature can be 100 °C. When the temperature inside the separator 10 reaches 100 °C, the water vapor inside the separator 10 is fully evaporated, the return valve 91 closes, and the steam inside the separator 10 can directly lead to the compressor 20.

[0074] In one embodiment, it further includes: a steam pipe 110; the steam pipe 110 is connected to the inlet of the compressor 20.

[0075] The steam pipe 110 is used to supply air to the compressor 20 to ensure a stable heat source.

[0076] In one embodiment, the steam pipe 110 is connected to the separator 10 through a branch pipe 111; a steam valve 112 is provided on the branch pipe 111.

[0077] When the steam valve 112 is opened, the steam inside the steam pipe 110 can directly enter the separator 10 to heat the separator 10; the steam evaporated from the wastewater inside the separator 10 then enters the secondary separator 90.

[0078] In one embodiment, the outlet end of the water outlet pipe 31 is connected to the cooling shaft seal of the compressor 20.

[0079] That is, the distilled water that has exchanged heat with the wastewater in the preheater 40 flows into the cooler seal of the compressor 20 to cool the mechanical seal of the compressor 20, thereby further improving the utilization of the thermal energy of the distilled water.

[0080] In another embodiment, a distilled water storage tank 42 is provided on the water outlet pipe 31; the distilled water storage tank 42 is arranged between the preheater 40 and the heater 30.

[0081] The distilled water storage tank 42 can store the distilled water. On the one hand, it ensures the stable water supply of the preheater 40 and thus has stable heat exchange performance. On the other hand, it avoids excessive water inflow at the cooler seal of the compressor 20. A water pump 41 is provided on the water outlet pipe 31.

[0082] As a further improvement, it further includes: a distilled water storage tank 100; the water outlet end of the water outlet pipe 31 is connected to the water inlet end of the distilled water storage tank 100; when the distilled water generation efficiency of the heater 30 is relatively high, the distilled water can be stored in the distilled water storage tank 100.

[0083] The above are the preferred embodiments of the present application and are not used to limit the present invention. Although the present application has been described in detail with reference to the examples, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing examples, or perform equivalent replacements for some of the technical features. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An MVR wastewater treatment system, characterized in that Comprising: A separator (10), a compressor (20), a heater (30), a preheater (40) and a waste water pipe (50); The waste water pipe (50) passes through the preheater (40) and the waste water pipe (50) is connected to the separator (10); The steam outlet of the separator (10) is connected to the inlet of the compressor (20); The outlet of the compressor (20) is connected to the steam inlet of the heater (30); The steam outlet of the heater (30) is connected to the steam inlet of the separator (10); The distilled water outlet of the heater (30) is connected to a water outlet pipe (31); The water outlet pipe (31) passes through the preheater (40).

2. The MVR wastewater treatment system according to claim 1, wherein The circulating discharge port of the separator (10) is connected to the material inlet of the heater (30) through a circulation pipe (11); The material outlet of the heater (30) is connected to the circulating feed inlet of the separator (10); A forced circulation pump (70) is arranged on the circulation pipe (11); The circulating discharge port is used for the concentrated liquid to flow out.

3. The MVR wastewater treatment system according to claim 1 or 2, characterized in that, It further comprises a crystallization kettle (80) and a controller; The discharge port of the separator (10) is connected to the crystallization kettle (80); A discharge valve (12) is arranged on the discharge port of the separator (10); A concentration monitor (13) is arranged inside the separator (10); Both the concentration monitor (13) and the discharge valve (12) are electrically connected to the controller.

4. The MVR wastewater treatment system according to claim 3, characterized in that, It further comprises a secondary separator (90); The steam outlet of the separator (10) is connected to the secondary separator (90); The return material port of the secondary separator (90) is connected to the separator (10); The steam outlet of the secondary separator (90) is connected to the inlet of the compressor (20).

5. The MVR wastewater treatment system according to claim 4, characterized in that, A temperature monitor (14) is arranged inside the separator (10); A return material valve (91) is arranged at the return material port of the secondary separator (90); Both the temperature monitor (14) and the return material valve (91) are electrically connected to the controller; The controller is used to close the return material valve (91) after the temperature monitor (14) monitors that the temperature inside the separator (10) reaches a preset temperature.

6. The MVR wastewater treatment system according to claim 4, wherein It further comprises: A steam pipe (110); The steam pipe (110) is connected to the inlet of the compressor (20).

7. The MVR wastewater treatment system according to claim 6, characterized in that, The steam pipe (110) is connected to the separator (10) through a branch pipe (111); A steam valve (112) is arranged on the branch pipe (111).

8. The MVR wastewater treatment system according to claim 1, wherein, The water outlet end of the water outlet pipe (31) is connected to the cooling gland of the compressor (20).

9. The MVR wastewater treatment system according to claim 8, characterized in that, A distilled water storage tank (42) is arranged on the water outlet pipe (31); The distilled water storage tank (42) is arranged between the preheater (40) and the heater (30).

10. The MVR wastewater treatment system according to claim 9, wherein, It further comprises: A distilled water storage tank (100); The water outlet end of the water outlet pipe (31) is connected to the water inlet end of the distilled water storage tank (100).

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