Mechanical seal cooling water circulation system of pump in ammonium sulfate evaporative crystallization system

Abstract

The utility model relates to a mechanical seal cooling water circulation system of a pump in an ammonium sulfate evaporative crystallization system, which comprises a cooling water tank, a cooling water pump and a water pump, one end of the water outlet pipe is connected with the heat exchange water pipe, and the other end of the water outlet pipe is connected to the mechanical seal cooling water inlet; one end of the water return pipe is connected with the heat exchange water pipe, the other end of the water return pipe is connected to the mechanical seal cooling water outlet, and a conductivity meter is arranged on the water return pipe and used for detecting the conductivity of cooling water in the water return pipe; the drainage pipe is connected with the cooling water tank and used for discharging cooling water in the cooling water tank, and a first electric control valve is arranged on the drainage pipe; one end of the water supplementing pipe is connected with the cooling water tank, and a second electric control valve is arranged on the water supplementing pipe. By automatically detecting the conductivity of the cooling water and controlling the opening and closing of the first electric control valve and the second electric control valve through the control system, the water discharging and supplementing work of the cooling water tank can be automatically completed, and the cooling water with the quality and quantity guaranteed in the cooling water tank is always kept to be used by a water pump mechanical seal of the system.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a mechanical seal cooling water circulation system of a pump in an ammonium sulfate evaporation crystallization system. Background Art

[0002] In the ammonium sulfate evaporation and crystallization system, a water pump is needed to realize the circulation of materials and water. In order to ensure the airtightness of the system, the water pump in the system mostly adopts a centrifugal pump with a double-end mechanical seal. During the operation of the water pump with a double-end mechanical seal, in order to avoid the mechanical seal of the pump being burned out due to high temperature, ensure the normal operation of the pump, and extend its service life as much as possible, it is necessary to continuously cool down the mechanical seal of the pump through a water cooling system, that is, mechanical seal cooling water.

[0003] In the current ammonium sulfate evaporation and crystallization process, the machine-sealed water tank is manually replenished and drained to maintain the normal quality of the machine-sealed water. The degree of automation is low, which easily causes overflow and waste of the water tank and is not conducive to the water quality assurance of the machine-sealed water for long-term use. Utility Model Content

[0004] Based on the above description, the utility model provides a mechanical seal cooling water circulation system for the pump in an ammonium sulfate evaporation and crystallization system to solve the problem that the manual replenishment and drainage method to maintain the normal quality of mechanical seal water has a low degree of automation, easily causes water tank overflow and waste, and is not conducive to the water quality assurance of mechanical seal water for long-term use.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] The present application provides a mechanical seal cooling water circulation system for a pump in an ammonium sulfate evaporation and crystallization system, and the technical solution adopted is as follows:

[0007] A mechanical seal cooling water circulation system for a pump in an ammonium sulfate evaporation and crystallization system, comprising:

[0008] A cooling water tank, which is equipped with a liquid level gauge;

[0009] A water outlet pipe, one end of which is connected to the hot water exchange pipe, and the other end is connected to the mechanical seal cooling water inlet, and a circulating water pump is provided on the water outlet pipe;

[0010] A return water pipe, one end of which is connected to the heat exchange water pipe, and the other end is connected to the mechanical seal cooling water outlet, and the return water pipe is provided with a conductivity meter, and the conductivity meter is used to detect the conductivity of the cooling water in the return water pipe;

[0011] A drain pipe connected to the cooling water tank for draining cooling water from the cooling water tank, wherein the drain pipe is provided with a first electrically controlled valve;

[0012] A water supply pipe, one end of which is connected to the cooling water tank, and a second electric-controlled valve is provided on the water supply pipe.

[0013] Preferably, the return water pipe is connected to a heat exchange tank, the return water pipe passes through the heat exchange tank, the heat exchange tank is connected to a hot water exchange pipe and a return pipe, one end of the hot water exchange pipe is connected to the heat exchange tank, and the other end is connected to the make-up water pipe, the second electrically-controlled valve is located between the hot water exchange pipe and the cooling water tank, and a third valve is provided on the hot water exchange pipe.

[0014] Preferably, a water thermometer for detecting water temperature is provided in the cooling water tank.

[0015] Preferably, a direct water supply pipe is provided between the water supply pipe and the water outlet pipe, and both ends of the direct water supply pipe are respectively connected to the water supply pipe and the water outlet pipe, the second electrically-controlled valve is located between the direct water supply pipe and the cooling water tank, a fourth valve is provided on the direct water supply pipe, and a fifth valve is provided on the water outlet pipe, and the fifth valve is located between the direct water supply pipe and the cooling water tank.

[0016] Preferably, the third valve, the fourth valve and the fifth valve are all electrically controlled valves.

[0017] Preferably, the output end of the water outlet pipe is connected to multiple mechanical seals through multiple water outlet branch pipes, and the input end of the water return pipe is connected to multiple mechanical seals through multiple water return branch pipes.

[0018] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0019] 1. The present application realizes the recycling of cooling water for mechanical seals through a cooling water tank, a water outlet pipe, a water return pipe and a circulating water pump, and by setting a conductivity meter on the return pipe to detect the conductivity of cooling water in the return pipe, when the mechanical seal leaks, the ammonium sulfate solution enters the cooling water of the mechanical seal, causing the conductivity of the cooling water to increase, and the concentration of ammonium sulfate in the cooling water to increase. The control system opens the first electrically controlled valve on the drain pipe to discharge part of the cooling water when it exceeds the set value according to the conductivity data, and detects the liquid level in the cooling water tank through a liquid level meter, and opens the second electrically controlled valve on the water supply pipe when the water is discharged to below the set liquid level. The water supply pipe is connected to the cooling water system in the factory area, and cooling water is added to the cooling water tank through the water supply pipe, so that the ammonium sulfate concentration of the cooling water in the cooling water tank is reduced and sufficient cooling water is ensured; the present application can automatically detect the conductivity of cooling water, and automatically complete the drainage and water supply work of the cooling water tank by controlling the opening and closing of the first electrically controlled valve and the second electrically controlled valve by the control system, so as to always keep the cooling water tank with a guaranteed quality and quantity of cooling water supply system for use by the pump mechanical seal;

[0020] 2. The present application sets a heat exchange tank, and the water supply pipe inputs cooling water into the heat exchange pipe through the hot water exchange pipe. The cooling water exchanges heat with the return cooling water in the return pipe in the heat exchange tank, thereby reducing the cooling water temperature in the mechanical seal circulation pipeline to ensure the cooling effect on the mechanical seal. The cooling water after heat exchange is output from the return pipe and flows back to the cooling water system in the plant area. A thermometer is set to detect the water temperature in the cooling water tank, and the third valve is opened to inject water into the heat exchange tank only when the water temperature exceeds the set value, thereby reducing the consumption of cooling water.

[0021] 3. The present application sets a direct water supply pipe. When the conductivity of the cooling water in the return pipe exceeds the set value, the fifth valve on the outlet pipe is closed and the fourth valve is opened. The water supply pipe directly supplies water to the circulating water pump through the direct water supply pipe to cool the machine seal. At the same time, the cooling water in the cooling water tank is discharged through the drain pipe. When the cooling water tank is drained and replenished, new external cooling water is directly supplied to the machine seal to cool the machine seal. The cooling of the machine seal is uninterrupted. At the same time, the new cooling water protects the machine seal better and extends the service life of the machine seal and the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic structural diagram of a mechanical seal cooling water circulation system for a pump in an ammonium sulfate evaporation and crystallization system provided in an embodiment of the utility model.

[0023] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0024] 1. Cooling water tank; 101. Liquid level meter; 102. Water temperature meter; 2. Outlet pipe; 21. Fifth valve; 22. Outlet branch pipe; 3. Circulating water pump; 4. Return pipe; 41. Return branch pipe; 5. Conductivity meter; 6. Drain pipe; 61. First electric control valve; 7. Make-up water pipe; 71. Second electric control valve; 8. Heat exchange tank; 9. Heat exchange water pipe; 91. Third valve; 10. Return pipe; 11. Direct supply water pipe; 111. Fourth valve; 12. Mechanical seal. DETAILED DESCRIPTION

[0025] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0027] It will be appreciated that spatial relationship terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0028] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0029] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0030] Reference Figure 1 As shown, an embodiment of the present application provides a cooling water circulation system for a mechanical seal 12 of a pump in an ammonium sulfate evaporation and crystallization system, which includes a cooling water tank 1, a water outlet pipe 2 and a return pipe 4. A liquid level gauge 101 is provided in the cooling water tank 1, one end of the water outlet pipe 2 is connected to the hot water exchange pipe 9, and the other end is connected to the cooling water inlet of the mechanical seal 12, a circulating water pump 3 is provided on the water outlet pipe 2, one end of the return pipe 4 is connected to the hot water exchange pipe 9, and the other end is connected to the cooling water outlet of the mechanical seal 12.

[0031] Reference Figure 1 As shown, further, in order to realize the automatic replenishment and drainage function of cooling water in the cooling water tank 1, the cooling water tank 1 is connected with a drain pipe 6 and a water replenishment pipe 7, the drain pipe 6 is used to discharge the cooling water in the cooling water tank 1, and a first electrically-controlled valve 61 is provided on the drain pipe 6, one end of the water replenishment pipe 7 is connected to the cooling water tank 1, and a second electrically-controlled valve 71 is provided on the water replenishment pipe 7; at the same time, a conductivity meter 5 is provided on the return water pipe 4, and the conductivity meter 5 is used to detect the conductivity of the cooling water in the return water pipe 4.

[0032] After the cooling water is output from the cooling water tank 1 through the outlet pipe 2, it is input into the mechanical seal 12 through the circulating water pump 3, and the mechanical seal 12 is cooled through the cooling water path of the mechanical seal 12. After passing through the mechanical seal 12, the cooling water is input into the return pipe 4 and returned to the cooling water tank 1, so as to realize the cooling water circulation function of the mechanical seal 12; a conductivity meter 5 is arranged on the return pipe 4 to detect the conductivity of the cooling water in the return pipe 4. When the mechanical seal 12 leaks, the ammonium sulfate solution enters the cooling water of the mechanical seal 12, causing the conductivity of the cooling water to increase, and the cooling water When the concentration of ammonium sulfate increases, the control system opens the first electrically controlled valve 61 on the drain pipe 6 to discharge part of the cooling water when it exceeds the set value according to the conductivity data, and detects the liquid level in the cooling water tank 1 through the liquid level meter 101. When the water is drained to below the set liquid level, the second electrically controlled valve 71 on the water supply pipe 7 is opened. The water supply pipe 7 is connected to the cooling water system in the plant area, and cooling water is added to the cooling water tank 1 through the water supply pipe 7 to reduce the concentration of ammonium sulfate in the cooling water in the cooling water tank 1 and ensure sufficient cooling water. The conductivity of the cooling water is automatically detected by the conductivity meter 5, and the control system controls the opening and closing of the first electrically controlled valve 61 and the second electrically controlled valve 71 to automatically complete the drainage and water supply work of the cooling water tank 1, so that the cooling water tank 1 always has a water pump seal 12 for the cooling water supply system with guaranteed quality and quantity.

[0033] Reference Figure 1 As shown, specifically, the ammonium sulfate evaporation and crystallization system usually includes multiple material pumps. In order to cool the mechanical seals 12 of all material pumps, the output end of the outlet pipe 2 is connected to the mechanical seals 12 of multiple material pumps through multiple outlet branches 22, and the input end of the return pipe 4 is connected to the mechanical seals 12 of multiple material pumps through multiple return branches 41, so as to cool the mechanical seals 12 of multiple material pumps through the cooling water circulation system.

[0034] Reference Figure 1 As shown, further, the temperature of the mechanical seal 12 cooling water will gradually increase when it circulates. In order to ensure the cooling effect on the mechanical seal 12, a heat exchange tank 8 is connected to the return water pipe 4. The return water pipe 4 passes through the heat exchange tank 8. The heat exchange tank 8 is connected to a hot water exchange pipe 9 and a return pipe 10. One end of the hot water exchange pipe 9 is connected to the heat exchange tank 8, and the other end is connected to the make-up water pipe 7. The second electrically-controlled valve 71 is located between the hot water exchange pipe 9 and the cooling water tank 1, and a third valve 91 is provided on the hot water exchange pipe 9. Specifically, one end of the return pipe 10 is connected to the heat exchange tank 8, and the other end can be connected to the plant cooling water circulation system or directly discharged. When the third valve 91 is opened, the cooling water is output from the water supply pipe 7 and input into the heat exchange tank 8 through the hot water exchange pipe 9. The cooling water exchanges heat with the return cooling water in the return pipe 4 in the heat exchange tank 8, thereby reducing the cooling water temperature in the circulation pipeline of the mechanical seal 12 to ensure the cooling effect on the mechanical seal 12. The cooling water after heat exchange is output from the return pipe 10 and flows back to the plant cooling water system or is directly discharged.

[0035] Reference Figure 1 As shown, further, a water thermometer 102 for detecting the water temperature is provided in the cooling water tank 1, and the third valve 91 is an electrically controlled valve. The water temperature in the cooling water tank 1 is detected by the water thermometer 102. When the temperature does not exceed the set value, the third valve 91 is closed and the cooling water in the return pipe 10 is not cooled. When the temperature exceeds the set value, the third valve 91 is opened to cool the cooling water in the return pipe 10, so that the cooling water temperature in the cooling water tank 1 is maintained within a certain range, which has a good cooling effect on the mechanical seal 12 and reduces the consumption of cooling water when the cooling water is directly discharged.

[0036] Reference Figure 1 As shown, further, a direct water supply pipe 11 is provided between the water supply pipe 7 and the water outlet pipe 2, and both ends of the direct water supply pipe 11 are connected to the water supply pipe 7 and the water outlet pipe 2 respectively, and the second electric control valve 71 is located between the direct water supply pipe 11 and the cooling water tank 1, and a fourth valve 111 is provided on the direct water supply pipe 11, and a fifth valve 21 is provided on the water outlet pipe 2, and the fifth valve 21 is located between the direct water supply pipe 11 and the cooling water tank 1. Specifically, the fourth valve 111 and the fifth valve 21 are both set as electric control valves.

[0037] When the fourth valve 111 is closed and the fifth valve 21 is opened, the cooling water circulates normally to cool the machine seal 12. When the machine seal 12 leaks and part of the cooling water in the cooling water tank 1 needs to be discharged and new cooling water needs to be added, the fourth valve 111 is opened, the fifth valve 21 is closed, and the water supply pipe 7 outputs the cooling water to directly supply water to the circulating water pump 3 through the direct supply water pipe 11 to cool the machine seal 12. At the same time, the first valve is opened, and the cooling water in the cooling water tank 1 is discharged through the drain pipe 6. When the liquid level in the cooling water tank 1 reaches the set value, the first valve is closed and the second valve is opened. The water supply pipe 7 replenishes cooling water to the cooling water tank 1. When the water level in the cooling water tank 1 reaches the set value, the second valve and the fourth valve 111 are closed, and the fifth valve 21 is opened. At this time, the cooling water in the cooling water tank 1 is output to supply water to the machine seal 12. When the cooling water tank 1 is drained and replenished, new external cooling water is directly supplied to the mechanical seal 12 to cool the mechanical seal 12. The cooling of the mechanical seal 12 is not interrupted. At the same time, the new cooling water better protects the mechanical seal 12 and prolongs the service life of the mechanical seal 12 and the pump. The cooling water circulation, replenishment, drainage and other operations of the entire system are controlled by the control system, so that the cooling system always maintains a guaranteed quality and quantity of cooling water for the water pump and mechanical seal 12 of the system.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mechanical seal cooling water circulation system for a pump in an ammonium sulfate evaporation and crystallization system, characterized in that: include: A cooling water tank (1) having a liquid level meter (101) disposed therein; A water outlet pipe (2), one end of which is connected to the hot water exchange pipe (9), and the other end of which is connected to the cooling water inlet of the mechanical seal (12), and a circulating water pump (3) is provided on the water outlet pipe (2); A water return pipe (4), one end of which is connected to the water exchange pipe (9), and the other end of which is connected to the cooling water outlet of the mechanical seal (12); a conductivity meter (5) is provided on the water return pipe (4), and the conductivity meter (5) is used to detect the conductivity of the cooling water in the water return pipe (4); a drain pipe (6), which is connected to the cooling water tank (1) and is used to discharge cooling water in the cooling water tank (1); a first electrically controlled valve (61) is provided on the drain pipe (6); A water supply pipe (7) has one end connected to the cooling water tank (1), and a second electrically controlled valve (71) is provided on the water supply pipe (7).

2. The cooling water circulation system of the pump mechanical seal (12) in the ammonium sulfate evaporation and crystallization system according to claim 1, characterized in that: The return water pipe (4) is connected to a heat exchange tank (8), the return water pipe (4) passes through the heat exchange tank (8), the heat exchange tank (8) is connected to a hot water exchange pipe (9) and a return pipe (10), one end of the hot water exchange pipe (9) is connected to the heat exchange tank (8), and the other end is connected to the water supply pipe (7), the second electrically controlled valve (71) is located between the hot water exchange pipe (9) and the cooling water tank (1), and a third valve (91) is provided on the hot water exchange pipe (9).

3. The cooling water circulation system of the pump mechanical seal (12) in the ammonium sulfate evaporation and crystallization system according to claim 2, characterized in that: The cooling water tank (1) is provided with a water temperature meter (102) for detecting water temperature.

4. The cooling water circulation system of the pump mechanical seal (12) in the ammonium sulfate evaporation and crystallization system according to claim 2, characterized in that: A direct water supply pipe (11) is provided between the water supply pipe (7) and the water outlet pipe (2), and two ends of the direct water supply pipe (11) are respectively connected to the water supply pipe (7) and the water outlet pipe (2), the second electric control valve (71) is located between the direct water supply pipe (11) and the cooling water tank (1), a fourth valve (111) is provided on the direct water supply pipe (11), and a fifth valve (21) is provided on the water outlet pipe (2), and the fifth valve (21) is located between the direct water supply pipe (11) and the cooling water tank (1).

5. The cooling water circulation system of the pump mechanical seal (12) in the ammonium sulfate evaporation and crystallization system according to claim 4, characterized in that: The third valve (91), the fourth valve (111) and the fifth valve (21) are all electrically controlled valves.

6. The cooling water circulation system of the pump mechanical seal (12) in the ammonium sulfate evaporation and crystallization system according to claim 1, characterized in that: The output end of the water outlet pipe (2) is connected to a plurality of mechanical seals (12) via a plurality of water outlet branch pipes (22), and the input end of the water return pipe (4) is connected to a plurality of mechanical seals (12) via a plurality of water return branch pipes (41).

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