Water supply device of water ring compressor

Abstract

The utility model relates to the technical field of PVC (polyvinyl chloride) production, and discloses a water supply device of a water ring compressor, which comprises a filter, the water ring compressor, a gas-liquid separator, a balance water tank, a water outlet of the filter and a water inlet of the water ring compressor are connected through the balance water tank, and a gas outlet of the water ring compressor is connected with the gas-liquid separator. The mounting position of the balance water tank is positioned above the water ring compressor; the number of the balance water tanks is at least two. The plurality of balance water tanks are arranged above the water inlet of the water ring compressor, so that when one balance water tank is cleaned and maintained, the other balance water tank can operate normally, the balance water tanks can be cleaned and maintained without stopping the system, and the technical problem that the balance water tanks are inconvenient to clean and maintain in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of PVC (polyvinyl chloride) production, in particular to a water supply device for a water ring compressor in a PVC production process. Background Art

[0002] Acetylene is one of the raw materials required for the production of PVC. In the process of wet production of acetylene, the crude acetylene gas generated in the acetylene generation section needs to be pressurized and transported by a water ring compressor. After removing impurities such as sulfur and phosphorus entrained in the crude acetylene gas in the acetylene purification section, it is then sent to the PVC synthesis section. In the above process, as an important device for purification, the quality of the working fluid of the water ring compressor is particularly important. Industrial water usually contains calcium and magnesium ions and solid impurities. If industrial water is used as the makeup water for the water ring compressor for a long time, scale will form in the pump cavity of the water ring compressor, which will affect the normal operation of the water ring compressor.

[0003] The PVC production process includes a PVC drying step. In the prior art, the centrifugal mother liquor water in the drying section of the PVC production process is usually used as the working fluid of the water ring compressor. When the balance water tank in the prior art needs to be cleaned and maintained, the system must be shut down to clean and maintain it. This operation will reduce the working efficiency of the water ring compressor and ultimately affect the entire industrial process of wet production of acetylene. Summary of the Utility Model

[0004] In order to solve the technical problem that the working fluid of the water ring compressor applied in the wet acetylene production process in the prior art is inconvenient to clean and maintain, the utility model proposes a water supply device for a water ring compressor.

[0005] The water supply device for a water ring compressor includes a filter, a water ring compressor, a gas-liquid separator, and a balance water tank. The outlet of the filter is connected to the inlet of the water ring compressor through the balance water tank. The outlet of the water ring compressor is connected to the gas-liquid separator. It also includes a water circulation pump. At least two balance water tanks are provided. The inlets of the balance water tanks are all connected to the outlet of the filter and the inlets of the balance water tanks are all connected to the inlet of the water ring compressor, and the installation position of the balance water tank is above the water ring compressor; the balance water tank is also provided with a return port. The liquid separated by the gas-liquid separator is sent to the return port through the water circulation pump, and the other part is sent to the acetylene generation section for use.

[0006] In the above water supply device for a water ring compressor, a makeup water regulating valve is provided between the inlet of the balance water tank and the outlet of the filter, and an outlet regulating valve is provided between the outlet of the balance water tank and the inlet of the water ring compressor.

[0007] In the above water supply device for a water ring compressor, the height difference between the balance water tank and the inlet of the water ring compressor is set to be greater than or equal to 10 m, and a liquid level gauge is also provided on the balance water tank.

[0008] The above water ring compressor water supply device further includes a heat exchanger, which is connected between the water circulation pump and the balance water tank. Part of the liquid processed by the heat exchanger is sent to the return port, and the other part is sent to an external pipeline.

[0009] In the above water ring compressor water supply device, the balance water tank is further provided with a sewage discharge port, and the sewage discharge port is connected to a sewage pipeline through a sewage control valve.

[0010] In the above water ring compressor water supply device, a liquid level gauge is provided on the gas-liquid separator, a return regulating valve is provided on the pipeline between the heat exchanger and the return port, and a water removal regulating valve is provided on the pipeline where the heat exchanger sends liquid to the acetylene production section.

[0011] The beneficial effects of the present utility model include: by providing a plurality of balance water tanks above the water inlet of the water ring compressor, when one of the balance water tanks is being cleaned and maintained, the other balance water tank can continue to operate, solving the technical problem of inconvenient maintenance of the balance water tank in the prior art. Description of the Drawings

[0012] Figure 1 It is a schematic structural diagram of one embodiment of the water ring compressor water supply device of the present utility model.

[0013] The marks in the figure are: 1 - filter, 2 - water ring compressor, 3 - gas-liquid separator, 4 - water circulation pump, 5 - balance water tank, 6 - make-up water regulating valve, 7 - outlet water regulating valve, 8 - liquid level gauge, 9 - heat exchanger, 10 - sewage control valve, 11 - return regulating valve, 12 - water removal regulating valve. Detailed Embodiments

[0014] The present utility model will be described below with reference to the accompanying drawings.

[0015] Embodiment 1:

[0016] As Figure 1 shown, the water ring compressor water supply device of the present utility model includes a filter 1, a water ring compressor 2, a gas-liquid separator 3, and a balance water tank 5. The outlet of the filter 1 is respectively connected to the inlets of a plurality of balance water tanks 5, the outlets of the balance water tanks 5 are all connected to the water inlet of the water ring compressor 2, the gas outlet of the water ring compressor 2 is connected to the gas-liquid separator 3, and it further includes a water circulation pump 4. Moreover, the installation position of the balance water tank 5 is above the water ring compressor 2, so as to ensure the constant pressure at the water inlet of the water ring compressor 2. The staff can set the height difference between the balance water tank 5 and the water inlet of the water ring compressor 2 according to the specific working conditions, so as to ensure that the centrifugal mother liquor water in the balance water tank 5 can generate sufficient static pressure, thereby stabilizing the pressure at the water inlet of the water ring compressor 2; the balance water tank 5 is further provided with a return port, and part of the liquid separated by the gas-liquid separator 3 is sent to the return port through the water circulation pump 4, and the other part is sent to an external pipeline.

[0017] Further, the water ring compressor water supply device described in this embodiment further includes a heat exchanger 9, which is connected between the water circulation pump 4 and the balance water tank 5. Since the working fluid temperature will increase during the process of the water ring compressor 2 treating the crude acetylene gas, a heat exchanger 9 is provided for cooling treatment. After the mixture of the compressed crude acetylene gas and the working fluid output by the water ring compressor 2 is separated by the gas-liquid separator 3, the working fluid in the high-temperature state is sent to the heat exchanger 9 by the circulating water pump 4. After being treated by the heat exchanger 9, a part of the working fluid is sent to the return port, and the other part is sent to the acetylene generation section for use.

[0018] In this embodiment, due to the possible entrainment of organic substances, polyvinyl chloride resin particles and solid impurities in the centrifuged mother liquor water, the centrifuged mother liquor water first needs to pass through the filter 1. After being filtered, the centrifuged mother liquor water enters the balance water tank 5 for storage. When starting for the first time, when the centrifuged mother liquor water in the balance water tank 5 reaches the specified liquid level, then start the water ring compressor 2 to compress the crude acetylene gas. The mixture of the treated crude acetylene gas and the working fluid enters the gas-liquid separator 3 for separation. The separated crude acetylene gas enters the next process of the acetylene production process. The working fluid in the high-temperature state is sent to the heat exchanger 9 by the water circulation pump 4 for cooling treatment. A part of the treated working fluid is sent to the return port of the balance water tank 5 for recycling, and the other part is sent to the acetylene generation section for reuse.

[0019] Example 2:

[0020] As Figure 1 shown, on the basis of the water ring compressor water supply device described in Example 1, further, a makeup water regulating valve 6 is provided between the water inlet of the balance water tank 5 and the water outlet of the filter 1, and an outlet water regulating valve 7 is provided between the water outlet of the balance water tank 5 and the water inlet of the water ring compressor 2. When the makeup water regulating valve 6 and the outlet water regulating valve 7 of one of the balance water tanks 5 are opened, the makeup water regulating valve 6 and the outlet water regulating valve 7 of the remaining balance water tanks 5 are both closed, and they are switched for use according to the states of the balance water tanks 5, which is convenient for cleaning and maintenance.

[0021] Further, in this embodiment, the height difference between the balance water tank 5 and the water inlet of the water ring compressor 2 is set to be greater than or equal to 10 m. Under the working conditions described in this embodiment, when the balance water tank 5 is 10 m higher than the water inlet of the water ring compressor 2, a more appropriate static pressure can be generated to ensure the stability of the water inlet pressure of the water ring compressor 2. And a liquid level gauge 8 is also provided on the balance water tank 5 to monitor the liquid level in the balance water tank 5 at any time, and the makeup water regulating valve 6 and the outlet water regulating valve 7 of the balance water tank 5 are feedback-controlled through the control system.

[0022] Further, in the water ring compressor water supply device described in this embodiment, the balance water tank 5 is further provided with a sewage outlet, and the sewage outlet is connected to a sewage pipeline through a sewage control valve 10. When regular cleaning and maintenance are required, the balance water tank 5 that is not in operation can be cleaned by closing the water outlet regulating valve 7 and opening the water replenishing regulating valve 6 and the sewage control valve 10, without affecting the normal use of the other balance water tanks 5.

[0023] Further, in the water ring compressor water supply device described in this embodiment, a liquid level gauge 8 is provided on the gas-liquid separator 3, a reflux regulating valve 11 is provided on the pipeline between the heat exchanger 9 and the reflux port, and a water removal regulating valve 12 is provided on the pipeline where the heat exchanger 9 sends water to the acetylene generation section. The control system can perform feedback control on the liquid level in the gas-liquid separator 3 by controlling the reflux regulating valve 11 and the water removal regulating valve 12 according to the parameters fed back by the liquid level gauges 8 of the balance water tank 5 and the gas-liquid separator 3.

[0024] In this embodiment, on the basis of the operation mode of Embodiment 1, a spare balance water tank 5 is provided by additionally paralleling the balance water tank 5. By switching the balance water tank 5, the cleaning and maintenance of the balance water tank 5 can be achieved without shutting down the system. At the same time, liquid level gauges 8 are provided on the balance water tank 5 and the gas-liquid separator 3. The upper control system can perform feedback control on the liquid levels in the balance water tank 5 and the gas-liquid separator 3 by controlling the water replenishing regulating valve 6, the water outlet regulating valve 7, the reflux regulating valve 11, and the water removal regulating valve 12, further ensuring the stability of the device operation.

[0025] Compared with the prior art, the present utility model ensures the stability of the water inlet pressure of the water ring compressor 2 by the static pressure of the centrifugal mother liquor water itself by arranging the balance water tank 5 at a certain height above the water inlet of the water ring compressor 2. And by providing multiple balance water tanks 5, the cleaning and maintenance of the balance water tank 5 can be carried out without shutting down the machine, effectively improving the work efficiency and solving the technical problem of inconvenient cleaning and maintenance of the balance water tank 5 in the prior art.

Claims

1. Water ring compressor water supply device, comprising a filter (1), a water ring compressor (2), a gas-liquid separator (3), and a balance water tank (5). The outlet of the filter (1) is connected to the inlet of the water ring compressor (2) through the balance water tank (5), and the gas outlet of the water ring compressor (2) is connected to the gas-liquid separator (3). It is characterized in that: It further includes a water circulation pump (4), at least two balance water tanks (5) are provided, the water inlets of the balance water tanks (5) are all connected to the water outlet of the filter (1), the water outlets of the balance water tanks (5) are all connected to the water inlet of the water ring compressor (2), and the installation position of the balance water tank (5) is above the water ring compressor (2); the balance water tank (5) is further provided with a reflux port, and the liquid separated by the gas-liquid separator (3) is sent to the reflux port through the water circulation pump (4), and the other part is sent to the acetylene generation section for use.

2. The water ring compressor water supply device according to claim 1, characterized in that: A makeup water regulating valve (6) is provided between the water inlet of the balance water tank (5) and the water outlet of the filter (1), and an outlet water regulating valve (7) is provided between the water outlet of the balance water tank (5) and the water inlet of the water ring compressor (2).

3. The water ring compressor water supply device according to claim 2, characterized in that: The height difference between the balance water tank (5) and the water inlet of the water ring compressor (2) is set to be greater than or equal to 10 m, and a liquid level gauge (8) is further provided on the balance water tank (5).

4. The water ring compressor water supply device according to claim 1, characterized in that: It further includes a heat exchanger (9), the heat exchanger (9) is connected between the water circulation pump (4) and the balance water tank (5), and a part of the liquid after being processed by the heat exchanger (9) is sent to the reflux port, and the other part is sent into an external pipeline.

5. The water ring compressor water supply device according to claim 1, characterized in that: The balance water tank (5) is further provided with a sewage discharge port, and the sewage discharge port is connected to a sewage discharge pipeline through a sewage discharge program control valve (10).

6. The water ring compressor water supply device according to claim 4, characterized in that: A liquid level gauge (8) is provided on the gas-liquid separator (3), a reflux regulating valve (11) is provided on the pipeline between the heat exchanger (9) and the reflux port, and a water removal regulating valve (12) is provided on the pipeline where the heat exchanger (9) sends liquid to the acetylene generation section.

Images