A split-type MVR evaporator

Abstract

This utility model relates to a split-type MVR evaporation device, including a wastewater evaporation system. The wastewater in the first separation chamber evaporates after exchanging heat with a first heat exchanger via a first circulation pipe. The evaporated wastewater vapor in the first separation chamber liquefies after exchanging heat with a second heat exchanger, and the liquefied distilled water is output. The clean water evaporation system includes a second separation chamber for evaporating clean water. The clean water in the second separation chamber evaporates after exchanging heat with a second heat exchanger via a second circulation pipe. The evaporated clean water vapor in the second separation chamber is pressurized by a compressor and then liquefies after exchanging heat with the first heat exchanger. The liquefied clean water is then returned to the second circulation pipe. By setting up the clean water evaporation system, the wastewater vapor is isolated from the compressor, avoiding the influence of wastewater quality on the entire evaporation system and improving the system's stability.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection, specifically to a split-type MVR evaporation device. Background Technology

[0002] When using an MVR heat exchanger to treat wastewater, a large amount of water vapor is generated during the evaporation of the wastewater. This water vapor becomes high-temperature and high-pressure steam under the action of the compressor, and exchanges heat with the wastewater in the circulation loop, heating the wastewater to above the boiling point to generate water vapor. The water vapor after heat exchange becomes high-temperature condensate, and the heat energy in it is recovered through the wastewater inlet preheating plate.

[0003] The core of this process is the full utilization of wastewater vapor by the compressor, and the quality of the vapor has a very significant impact on the stable operation of the compressor.

[0004] Because wastewater from various industries varies greatly in quality, the properties of the water vapor produced during evaporation also differ. For example, wastewater containing surfactants will carry a large amount of foam during evaporation; wastewater with high carbonic acid alkalinity will contain a large amount of non-condensable gases in its water vapor; in addition, the steam from the evaporation process of wastewater containing hydrochloric acid and ammonia will contain a large amount of hydrogen chloride and ammonia. These components can damage the compressor and greatly shorten its service life. As the core and high-value equipment of MVR, the compressor's damage will directly lead to system paralysis and cause significant economic losses. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a split-type MVR evaporation device to solve the technical problem that the compressor in the evaporation device needs to come into contact with hydrogen chloride and ammonia in the wastewater vapor, thereby damaging the compressor and shortening its service life.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A split-type MVR evaporator is provided, including

[0008] The wastewater evaporation system includes a first separation chamber for evaporating wastewater. Wastewater in the first separation chamber evaporates after exchanging heat with a first heat exchanger via a first circulation pipeline. The wastewater vapor evaporated in the first separation chamber is liquefied after exchanging heat with a second heat exchanger. The liquefied distilled water is then output.

[0009] The water evaporation system includes a second separation chamber for evaporating water. The water in the second separation chamber evaporates after exchanging heat with a second heat exchanger via a second circulation pipeline. The water vapor evaporated in the second separation chamber is pressurized by a compressor and then liquefied by exchanging heat with a first heat exchanger. The liquefied water is then returned to the second circulation pipeline.

[0010] Furthermore, the second heat exchanger is connected to the first steam pipe and the first liquefaction pipe, the first steam pipe is connected to the first separation chamber, and the first liquefaction pipe is equipped with a first distilled water tank and a first vacuum pump.

[0011] Furthermore, the first liquefaction pipeline is connected to the third heat exchanger, the third heat exchanger is connected to the wastewater inlet pipe, the wastewater inlet pipe is connected to the first circulation pipeline, and the wastewater in the wastewater inlet pipe is heated by the third heat exchanger and then sent to the first circulation pipeline.

[0012] Furthermore, a second steam pipe is connected between the first heat exchanger and the second separation chamber, and a second vacuum pump and a compressor are installed on the second steam pipe;

[0013] A second liquefaction pipeline is connected between the first heat exchanger and the first circulation pipeline, and a second distilled water tank and a second hot water pump are installed on the second liquefaction pipeline.

[0014] Furthermore, the first heat exchanger is connected to an external steam pipe, through which steam is supplied to the first heat exchanger.

[0015] Furthermore, the compressor may be a single-screw compressor.

[0016] Furthermore, both the first and second heat exchangers are tubular or plate heat exchangers.

[0017] The beneficial effects of this utility model are:

[0018] This utility model's split-type MVR evaporation device adds a clean water evaporation system outside the wastewater evaporation system. The steam generated from the wastewater heats the clean water, and the steam generated from the clean water is used as the compressor's intake air. After being heated and pressurized, it exchanges heat with the first heat exchanger and is used to heat the wastewater. The condensed clean water steam is returned to the clean water evaporation system for recycling, thus ensuring that the compressor's intake air is always clean steam, greatly reducing the probability of compressor damage. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the split-type MVR evaporation device of this utility model;

[0021] Figure 2 This is a schematic diagram of a water evaporation system;

[0022] Figure 3 This is a schematic diagram of a wastewater evaporation system;

[0023] in,

[0024] 1. First separation chamber; 11. First vacuum pump; 12. First circulation pump; 13. First hot water pump; 14. Discharge pump;

[0025] 2. Second separation chamber; 21. Second vacuum pump; 22. Second circulation pump; 23. Second hot water pump; 24. Compressor;

[0026] 31. First heat exchanger; 32. Second heat exchanger; 33. Third heat exchanger;

[0027] 41. First distilled water tank; 42. Second distilled water tank;

[0028] 5. External steam pipe. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] This application provides a split-type MVR evaporator, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0031] To address the technical problem in existing evaporation devices where the compressor 24 needs to come into contact with hydrogen chloride and ammonia in wastewater vapor, thereby damaging the compressor 24 and shortening its service life, an embodiment of this application provides a split-type MVR evaporation device. This is described in detail below.

[0032] like Figures 1 to 3 As shown, a split-type MVR evaporator includes...

[0033] The wastewater evaporation system includes a first separation chamber 1 for evaporating wastewater. The wastewater in the first separation chamber 1 is evaporated after exchanging heat with the first heat exchanger 31 through the first circulation pipeline. The wastewater vapor evaporated in the first separation chamber 1 is liquefied after exchanging heat with the second heat exchanger 32. The liquefied distilled water is output to the outside.

[0034] The water evaporation system includes a second separation chamber 2 for evaporating water. The water in the second separation chamber 2 is evaporated after exchanging heat with the second heat exchanger 32 through the second circulation pipeline. The water vapor evaporated in the second separation chamber 2 is pressurized by the compressor 24 and then liquefied by exchanging heat with the first heat exchanger 31. The liquefied water is then transported back to the second circulation pipeline.

[0035] Specifically, as an optional implementation method in this embodiment, such as Figures 1 to 3 As shown, the second heat exchanger 32 is connected to the first steam pipe and the first liquefaction pipe. The first steam pipe is connected to the first separation chamber 1. The first liquefaction pipe is equipped with a first distilled water tank 41 and a first vacuum pump 11.

[0036] For details, see Figure 3 A first hot water pump 13 is also installed on the first liquefaction pipeline. The first hot water pump 13 transports the high-temperature distilled water in the first distilled water tank 41 to the outside.

[0037] Specifically, as an optional implementation method in this embodiment, such as Figures 1 to 3 As shown, the first liquefaction pipeline is connected to the third heat exchanger 33, the third heat exchanger 33 is connected to the wastewater inlet pipe, the wastewater inlet pipe is connected to the first circulation pipeline, and the wastewater in the wastewater inlet pipe is heated by the third heat exchanger 33 and then sent to the first circulation pipeline.

[0038] During operation, the wastewater vapor in the first separation chamber 1 enters the second heat exchanger 32 through the first steam pipe for heat exchange, condenses to form high-temperature distilled water, enters the first distilled water tank 41, and is then sent to the third heat exchanger 33 by the first hot water pump 13.

[0039] Specifically, as an optional implementation method in this embodiment, such as Figures 1 to 3 As shown, a second steam pipe is connected between the first heat exchanger 31 and the second separation chamber 2, and a second vacuum pump 21 and a compressor 24 are installed on the second steam pipe;

[0040] The first heat exchanger 31 is connected to the first circulation pipeline via a second liquefaction pipeline, and the second liquefaction pipeline is equipped with a second distilled water tank 42 and a second hot water pump 23.

[0041] Specifically, as an optional implementation method in this embodiment, such as Figures 1 to 3 As shown, the first heat exchanger 31 is connected to an external steam pipe, and steam is supplied to the first heat exchanger 31 through the external steam pipe 5.

[0042] To maintain stable system operation, the amount of external steam supplied should not be less than 5% of the wastewater treatment volume.

[0043] Specifically, as an optional implementation method in this embodiment, such as Figures 1 to 3 As shown, the compressor 24 can be a single screw compressor 24.

[0044] Specifically, as an optional implementation method in this embodiment, such as Figures 1 to 3 As shown, both the first heat exchanger 31 and the second heat exchanger 32 are tubular heat exchangers or plate heat exchangers.

[0045] Specifically, the first circulation pipeline is as follows: Figure 3 As shown, two pipes are provided between the second heat exchanger 32 and the first separation chamber 1. The first circulation pump 12 is installed on one of the pipes. Starting the first circulation pump 12 can circulate the wastewater in the first separation chamber 1 and the second heat exchanger 32 for heat exchange, thereby causing the wastewater to evaporate.

[0046] Specifically, the second circulation pipeline is as follows: Figure 2 As shown, two pipes are provided between the first heat exchanger 31 and the second separation chamber 2. The second circulation pump 22 is installed on one of the pipes. Starting the second circulation pump 22 can circulate the wastewater in the second separation chamber 2 with the first heat exchanger 31 for heat exchange, thereby causing the clean water to be heated and evaporated.

[0047] Specifically, such as Figure 3 As shown, the bottom of the first separation chamber 1 is connected to the discharge pump 14, which discharges the concentrate from the bottom of the first separation chamber 1 into the separation chamber.

[0048] The evaporation device in this embodiment isolates wastewater vapor from the compressor 24 by setting up a clean water evaporation system, thereby avoiding the impact of wastewater quality on the entire evaporation system and improving the stability of the system.

[0049] The working process of the evaporation device is as follows:

[0050] After the wastewater is heated to its boiling point by the second heat exchanger 32, it undergoes gas-liquid separation in the first separation chamber 1. Under the action of the first vacuum pump 11, the wastewater vapor is extracted from the top of the first separation chamber 1 and passes through the first heat exchanger 31. After exchanging heat with the clean water, it becomes wastewater distilled water. The wastewater distilled water is collected by the first distilled water tank 41 and then sent to the third heat exchanger 33 by the first hot water pump 13 to exchange heat with the wastewater inlet water, increase the inlet water temperature, and recover the heat energy of the distilled water.

[0051] After the clean water exchanges heat with the wastewater steam in the first heat exchanger 31, it is heated to above the boiling point. Gas-liquid separation is carried out in the second separation chamber 2. The clean water steam is drawn out of the second separation chamber 2 by the second vacuum pump 21 and then heated and pressurized by the compressor 24 to form high-grade steam. It exchanges heat with the wastewater inlet in the first heat exchanger 31. The clean water condensate is collected by the second distilled water tank 42 and then sent back to the clean water evaporation system by the second hot water pump 23.

[0052] The first vacuum pump 11 and the second vacuum pump 21 control the vacuum level of the first separation chamber 1 and the second separation chamber 2, respectively, thereby controlling the evaporation temperature in the first separation chamber 1 and the second separation chamber 2. To maintain stable system operation, the evaporation temperature of the first separation chamber 1 should generally be at least 8°C higher than the evaporation temperature of the second separation chamber 2.

[0053] All the devices selected in this application (parts whose specific structures are not specified) are general standard parts or parts known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0054] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0055] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0057] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0058] In addition, in the various embodiments of this utility model, each functional unit can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0059] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A split-type MVR evaporation device, characterized in that, include The wastewater evaporation system includes a first separation chamber (1) for evaporating wastewater. The wastewater in the first separation chamber (1) is evaporated after exchanging heat with the first heat exchanger (31) through the first circulation pipeline. The wastewater vapor evaporated in the first separation chamber (1) is liquefied after exchanging heat with the second heat exchanger (32). The liquefied distilled water is output to the outside. The water evaporation system includes a second separation chamber (2) for evaporating water. The water in the second separation chamber (2) is evaporated after exchanging heat with the second heat exchanger (32) through the second circulation pipeline. The water vapor evaporated in the second separation chamber (2) is pressurized by the compressor (24) and then liquefied by exchanging heat with the first heat exchanger (31). The liquefied water is then transported back to the second circulation pipeline.

2. The split-type MVR evaporator according to claim 1, characterized in that, The second heat exchanger (32) is connected to the first steam pipe and the first liquefaction pipe. The first steam pipe is connected to the first separation chamber (1). The first liquefaction pipe is equipped with a first distilled water tank (41) and a first vacuum pump (11).

3. The split-type MVR evaporator according to claim 2, characterized in that, The first liquefaction pipeline is connected to the third heat exchanger (33), the third heat exchanger (33) is connected to the wastewater inlet pipe, the wastewater inlet pipe is connected to the first circulation pipeline, and the wastewater in the wastewater inlet pipe is heated by the third heat exchanger (33) and then sent to the first circulation pipeline.

4. The split-type MVR evaporator according to claim 1, characterized in that, A second steam pipe is connected between the first heat exchanger (31) and the second separation chamber (2), and a second vacuum pump (21) and a compressor (24) are installed on the second steam pipe; The first heat exchanger (31) is connected to the first circulation pipeline via a second liquefaction pipeline, and the second liquefaction pipeline is equipped with a second distilled water tank (42) and a second hot water pump.

5. A split-type MVR evaporator according to claim 4, characterized in that, The first heat exchanger (31) is connected to an external steam pipe, and steam is supplied to the first heat exchanger (31) through the external steam pipe (5).

6. A split-type MVR evaporator according to claim 1, characterized in that, The compressor (24) may be a single screw compressor.

7. A split-type MVR evaporator according to claim 1, characterized in that, Both the first heat exchanger (31) and the second heat exchanger (32) are tubular heat exchangers or plate heat exchangers.

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