Automatic liquid supplementing and liquid discharging counting device for MVR (Mechanical Vapor Recompression)

Abstract

An automatic liquid supplementing and liquid discharging counting device for MVR (mechanical vapor recompression) belongs to the technical field of sewage treatment and comprises a heat exchanger, an evaporator, a compressor, an evaporator liquid discharging pipeline, an evaporator liquid inlet pipeline, a condensate water overflow pipeline and a condensate water tank. An evaporator liquid discharge pipeline and an evaporator liquid inlet pipeline are arranged at the bottom of the heat exchanger, a third pneumatic valve is arranged on the evaporator liquid discharge pipeline, a fourth pneumatic valve is arranged on the evaporator liquid inlet pipeline, the side end of the heat exchanger is connected with a condensate water tank through a condensate water overflow pipeline, and a first liquid level sensor is arranged on the side wall of the upper end of the heat exchanger. The device disclosed by the utility model can be used for automatically supplementing liquid, one-time heating and automatic liquid supplementing, the treatment efficiency is higher, the heating times are reduced, the heating time is shortened, and the evaporation energy consumption is reduced; by means of a liquid discharge counting mode, convenience and simplicity are achieved, counting is more accurate than that of a flow sensor, and cost is lower.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment and relates to an automatic liquid replenishing and liquid discharging counting device for MVR. Background Art

[0002] Traditional MVR evaporation equipment cannot automatically replenish liquid, and each evaporation requires evaporation heating, resulting in long heating time, low efficiency, and high evaporation energy consumption.

[0003] The counting method of traditional MVR evaporation equipment uses flow sensors for counting, such as vortex flow sensors, electromagnetic flow sensors, and ultrasonic flow sensors. These flow sensors have certain limitations on the waste liquid they process. Impurities, foreign matter, or high oil content in the waste liquid will affect the accuracy of the counting. Air in the pipeline and the inability of the liquid to fill the pipeline will also affect the accuracy of the counting. Summary of the invention

[0004] In order to solve the defects existing in the prior art, the purpose of the utility model is to provide an MVR automatic liquid replenishment and discharge counting device, including a heat exchanger, an evaporator, a compressor, an evaporator discharge pipeline, an evaporator inlet pipeline, a condensate overflow pipeline and a condensate tank, the evaporator is connected to the heat exchanger, and the evaporator is connected to the heat exchanger through the compressor. The evaporator discharge pipeline and the evaporator inlet pipeline are arranged at the bottom of the heat exchanger, the evaporator discharge pipeline is arranged on the third pneumatic valve, the evaporator inlet pipeline is arranged on the fourth pneumatic valve, the side end of the heat exchanger is connected to the condensate tank through the condensate overflow pipeline, and the first liquid level sensor is arranged on the upper side wall of the heat exchanger.

[0005] Furthermore, the side wall of the bottom end of the condensate tank is connected to the bottom of the counter pump through a condensate drainage pipeline, and a first pneumatic valve is arranged on the condensate drainage pipeline.

[0006] Furthermore, the upper end of the condensate tank is connected to the A outlet of the pneumatic three-way valve through an air pressure balance pipeline, the B outlet of the pneumatic three-way valve is connected to the top of the counting pump, and the C outlet of the pneumatic three-way valve is connected to the external equipment through an air supply pipeline, and a pressure reducing valve is arranged on the air supply pipeline.

[0007] Furthermore, a drainage pipeline is inserted from the top of the counter pump to the bottom thereof and connected to an external device, and a second pneumatic valve and a check valve are sequentially arranged on the drainage pipeline.

[0008] Furthermore, a third liquid level sensor is arranged on the lower side wall of the counter pump, and a fourth liquid level sensor is arranged on the upper side wall.

[0009] Furthermore, a second liquid level sensor is disposed on the upper side wall of the condensate tank.

[0010] Furthermore, the fourth liquid level sensor is lower in height than the second liquid level sensor.

[0011] Furthermore, the inlet of the drainage pipeline is lower than the third liquid level sensor.

[0012] The beneficial effects of the utility model are as follows: the utility model can automatically replenish liquid, heat once, automatically replenish liquid, have higher processing efficiency, reduce the number of heating times, shorten the heating time, and reduce evaporation energy consumption; the utility model utilizes a liquid discharge counting method, which is convenient and simple, more accurate than a flow sensor counting method, and has lower cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The structure of the utility model is shown in FIG. Figure 1 ;

[0014] Figure 2 The structure of the utility model is shown in FIG. Figure 2 .

[0015] The reference numerals in the figures are as follows:

[0016] 100, heat exchanger, 101, evaporator, 102, compressor, 103, evaporator drain pipeline, 104, evaporator inlet pipeline, 105, condensate overflow pipeline, 106, condensate tank, 107, counter pump, 108, condensate drain pipeline, 109, air pressure balance pipeline, 110, air supply pipeline, 111, drainage pipeline;

[0017] 201, a first liquid level sensor, 202, a second liquid level sensor, 203, a third liquid level sensor, 204, a fourth liquid level sensor;

[0018] 301, first pneumatic valve, 302, second pneumatic valve, 303, pneumatic three-way valve, 304, pressure reducing valve, 305, check valve, 307, third pneumatic valve, 308, fourth pneumatic valve. DETAILED DESCRIPTION

[0019] The following is combined with Figure 1-Figure 2 The utility model is further described as follows: an automatic liquid replenishment and discharge counting device for MVR includes a heat exchanger 100, an evaporator 101, a compressor 102, an evaporator discharge pipeline 103, an evaporator inlet pipeline 104, a condensate overflow pipeline 105 and a condensate tank 106, the evaporator 101 is connected to the heat exchanger 100, and the evaporator 101 is connected to the heat exchanger 100 through the compressor 102, the evaporator discharge pipeline 103 and the evaporator inlet pipeline 104 are arranged at the bottom of the heat exchanger 100, the evaporator discharge pipeline 103 is arranged on the third pneumatic valve 307, the evaporator inlet pipeline 104 is arranged on the fourth pneumatic valve 308, the side end of the heat exchanger 100 is connected to the condensate tank 106 through the condensate overflow pipeline 105, and the first liquid level sensor 201 is arranged on the upper side wall of the heat exchanger 100.

[0020] The side wall of the bottom end of the condensed water tank 106 is connected to the bottom of the counter pump 107 through a condensed water drainage pipeline 108 , and a first pneumatic valve 301 is provided on the condensed water drainage pipeline 108 .

[0021] Among them, the upper end of the condensed water tank 106 is connected to the A outlet of the pneumatic three-way valve 303 through the air pressure balance pipeline 109, the B outlet of the pneumatic three-way valve 303 is connected to the top of the counting pump 107, and the C outlet of the pneumatic three-way valve 303 is connected to the external equipment through the air supply pipeline 110, and the pressure reducing valve 304 is arranged on the air supply pipeline 110.

[0022] A drainage pipeline 111 is inserted from the top of the counter pump 107 to the bottom thereof and connected to an external device. A second pneumatic valve 302 and a check valve 305 are sequentially arranged on the drainage pipeline 111 .

[0023] Wherein, a third liquid level sensor 203 is disposed on the lower side wall of the counter pump 107 , and a fourth liquid level sensor 204 is disposed on the upper side wall.

[0024] Wherein, a second liquid level sensor 202 is disposed on the upper side wall of the condensed water tank 106 .

[0025] The fourth liquid level sensor 204 is lower in height than the second liquid level sensor 202 .

[0026] The inlet of the drainage pipeline 111 is lower than the third liquid level sensor 203 .

[0027] The working process of the utility model is as follows:

[0028] After the MVR device is started, the fourth pneumatic valve 308 is opened, and the waste liquid enters the pipe process of the heat exchanger 100 through the evaporator liquid inlet pipeline 104, and reaches the specified liquid level, that is, the first liquid level sensor 201 triggers the specified time.

[0029] After the equipment is heated, the waste liquid reaches a boiling state, and the water vapor in the evaporator 101 passes through the compressor 102, is pressurized and heated, and then enters the shell side of the heat exchanger 100 to exchange heat with hot water. The condensed water overflows into the condensed water tank 106 through the condensed water overflow pipe 105.

[0030] The waste water evaporates continuously, and the waste water in the heat exchanger 100 flows with the passage of time. The liquid level of the waste liquid drops, and the first liquid level sensor 201 is no longer triggered. The PLC receives the signal and opens the fourth pneumatic valve 308. The waste liquid passes through the evaporator liquid inlet pipeline 104 to automatically replenish the heat exchanger 100. To ensure boiling, the first liquid level sensor 201 is continuously triggered intermittently. The PLC setting is adopted. When the first liquid level sensor 201 is not triggered for a specified time, the replenishment function is implemented.

[0031] The waste liquid evaporates continuously, and the condensed water also increases continuously. When the condensed water level overflowing into the condensed water tank 106 reaches the second liquid level sensor 202, the first pneumatic valve 301 is opened, and the condensed water passes through the condensed water drainage pipeline 108 and enters the counter pump 107. When the third liquid level sensor 203 and the fourth liquid level sensor 204 are triggered at the same time, the first pneumatic valve 301 is closed, and at the same time, the second pneumatic valve 302 and the pneumatic three-way valve 303 are opened. After the pneumatic three-way valve 303 is opened, the compressed air passes through the air supply pipeline 110, and then enters the counter pump 107 through the B port and the C port of the pneumatic three-way valve 303. The pressure in the counter pump 107 increases, and the condensed water in the counter pump 107 is pressed into the drainage pipeline 111 by the air pressure, and is discharged to the designated position through the second pneumatic valve 302.

[0032] When the third liquid level sensor 203 and the fourth liquid level sensor 204 are not triggered at the same time, the second pneumatic valve 302 and the pneumatic three-way valve 303 are closed to end the drainage. At this time, a signal is given to the PLC and counted once.

[0033] By measuring the height difference between the third liquid level sensor 203 and the fourth liquid level sensor 204, and the inner diameter of the counting pump 107, the volume between the two liquid level sensors, that is, the volume of the liquid discharged once, can be calculated. Each time the liquid is discharged, the PLC will count, and the total volume of the liquid discharged can be obtained by multiplying the cumulative number of discharges by the volume of the liquid discharged once.

[0034] The condensed water is clear and free of impurities, and is counted mechanically, which is convenient and accurate.

[0035] The heat exchanger 100 automatically replenishes liquid, the counting pump 107 counts the discharge of liquid, and the equipment operates stably. When the equipment runs for a certain period of time, the equipment is shut down, and the third pneumatic valve 307 is opened. After the waste liquid is concentrated, it is discharged to the designated location through the evaporator 103 discharge pipeline.

[0036] There are many heat exchange tubes in the heat exchanger 100, the inner side of the tube is named as the tube side, and the outer side of the tube is named as the shell side.

[0037] The pneumatic three-way valve 303 is a three-way valve. When the valve is opened, ports B and C of the valve are connected, and when the valve is closed, ports A and B are connected.

[0038] The fourth liquid level sensor 204 needs to be lower in height than the second liquid level sensor 202 .

[0039] The pipe of the drainage pipeline 111 needs to be lower than the third liquid level sensor 203 to ensure that no compressed air but only condensed water enters the pipe.

[0040] When the pneumatic three-way valve 303 and the second pneumatic valve 302 are closed, there is still air pressure in the counting pump 107. The pneumatic three-way valve 303 is closed, and the A port and B port of the three-way valve are connected. The air pressure is discharged into the condensate tank 106 through the air pressure balance pipeline 109 to prepare for the next drainage. If the pressure of the counting pump 107 is higher than the pressure of the condensate tank 106, the water in the condensate tank 106 cannot be discharged into the counting pump 107. The counting pump 107 is connected to the condensate tank 106 through the air pressure balance pipeline 109. The air pressure of the counting pump 107 and the condensate tank 106 is the same. The condensed water in the condensate tank 106 can flow into the counting pump 107 by utilizing the height difference. If the port A of the pneumatic three-way valve 303 is connected to the atmosphere, the above purpose can also be achieved. However, the port A of the pneumatic three-way valve 303 is connected to the atmosphere. When the pneumatic three-way valve 303 is closed, there is pressure in the counter pump 107, and there is also some water vapor. The water vapor will be discharged from the port A of the pneumatic three-way valve 303. When it accumulates, it will flow to the ground. This problem can be avoided by connecting the counter pump 107 with the condensed water tank 106 through the air pressure balance pipeline 109.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A device for automatic liquid replenishment and liquid discharge counting for MVR, characterized in that: The invention comprises a heat exchanger (100), an evaporator (101), a compressor (102), an evaporator liquid discharge pipeline (103), an evaporator liquid inlet pipeline (104), a condensed water overflow pipeline (105) and a condensed water tank (106); the evaporator (101) is connected to the heat exchanger (100); the evaporator (101) is connected to the heat exchanger (100) via the compressor (102); the evaporator liquid discharge pipeline (103) and the evaporator liquid inlet pipeline (104) are arranged at the bottom of the heat exchanger (100); a third pneumatic valve (307) is arranged on the evaporator liquid discharge pipeline (103); a fourth pneumatic valve (308) is arranged on the evaporator liquid inlet pipeline (104); the side end of the heat exchanger (100) is connected to the condensed water tank (106) via the condensed water overflow pipeline (105); and a first liquid level sensor (201) is arranged on the upper side wall of the heat exchanger (100).

2. The MVR automatic liquid replenishment and liquid discharge counting device according to claim 1, characterized in that: The side wall at the bottom end of the condensate tank (106) is connected to the bottom of the counter pump (107) via a condensate drainage pipeline (108), and a first pneumatic valve (301) is provided on the condensate drainage pipeline (108).

3. The MVR automatic liquid replenishment and liquid discharge counting device according to claim 2, characterized in that: The upper end of the condensed water tank (106) is connected to the A outlet of the pneumatic three-way valve (303) via the air pressure balance pipeline (109), the B outlet of the pneumatic three-way valve (303) is connected to the top of the counter pump (107), and the C outlet of the pneumatic three-way valve (303) is connected to an external device via an air supply pipeline (110), and a pressure reducing valve (304) is provided on the air supply pipeline (110).

4. The MVR automatic liquid replenishment and liquid discharge counting device according to claim 3, characterized in that: A drainage pipeline (111) is inserted from the top of the counter pump (107) to the bottom thereof and connected to an external device. A second pneumatic valve (302) and a check valve (305) are sequentially arranged on the drainage pipeline (111).

5. The MVR automatic liquid replenishment and liquid discharge counting device according to claim 4, characterized in that: A third liquid level sensor (203) is arranged on the lower side wall of the counter pump (107), and a fourth liquid level sensor (204) is arranged on the upper side wall.

6. The MVR automatic liquid replenishment and liquid discharge counting device according to claim 5, characterized in that: A second liquid level sensor (202) is provided on the upper side wall of the condensed water tank (106).

7. The MVR automatic liquid replenishment and liquid discharge counting device according to claim 6, characterized in that: The fourth liquid level sensor (204) is lower in height than the second liquid level sensor (202).

8. The MVR automatic liquid replenishment and liquid discharge counting device according to claim 5, characterized in that: The inlet of the drainage pipeline (111) is lower than the third liquid level sensor (203).

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