CN204750824U - A liquid storage pot for machine seals and washes - Google Patents

Abstract

The utility model discloses a liquid storage tank for mechanical seal flushing, which comprises a tank body, wherein, the top of the tank body is provided with a supplementary spacer liquid inlet, a cooling water outlet, a nitrogen pressurized interface and a TI thermometer. There is an on-site pressure gauge on the upper side of the tank, an LSL liquid level switch on the lower side of the tank, and a cooling water inlet, a discharge port, an insulating fluid inlet and an insulating fluid outlet at the bottom of the tank. The utility model is more economical by comparing the optimized scheme, and at the same time, the operability is also improved compared with the previous ones: not only the delivery pump, pipeline, valve, etc. for sending liquid outside are omitted, but also the air bag pressure accumulator and pressure alarm are omitted device; compared with a single pump, only a thermometer that can transmit signals remotely, a low liquid level switch, and a manual liquid (oil) device are added, and the cost is only one-third of the original plan; the operability is nitrogen. The sealing liquid pressure is adjustable, and each pump of the spacer liquid is isolated and does not affect each other, and can be replenished manually.

Description

A liquid storage tank for mechanical seal flushing

technical field

The utility model relates to the optimization and improvement of a machine seal flushing scheme PLAN53A. The external pressurized isolation liquid storage tank provides clean liquid to the sealing cavity, and the circulation is completed by the internal infusion ring. The pressure of the isolation liquid storage tank is greater than the pressure of the sealed process liquid. , to achieve the purpose of zero process emissions, belonging to the field of chemical machinery.

Background technique

In chemical production, mechanical seals are the most commonly used sealing form for chemical pumps, but pump leakage due to mechanical seal damage is very common during use. Therefore, how to correctly install and use mechanical seals and maintain them reasonably to reduce leakage, prevent pollution, and improve economic benefits is an important task for chemical companies.

For production needs, some pumps in the prior art adopt the sealing form of double-machine sealing with spacer fluid, which is usually used to transport toxic, volatile, flammable and explosive media that are not allowed to leak. The flushing scheme adopts the PLAN53A scheme. The supplementary spacer fluid is supplied from the outside, and after passing through the air bag pressure accumulator (eliminating its pressure fluctuation, the circulation is completed by the infusion ring inside the mechanical seal, and the heat in the circulation is removed by the water cooling heat exchanger. Finally, it is transported to the mechanical seal to reduce the temperature of the sealing end surface, ensure the stability of the fluid film on the sealing end surface, and prevent solid impurities and oil coke from depositing in the sealing cavity. There is also a low pressure alarm device (PSL) in this flushing mechanical seal solution. The pressure state of the liquid storage tank can be known in the control room, and its temperature and pressure can also be observed on site during the inspection, thus ensuring the efficient operation of the pump.

The existing mechanical seal flushing scheme PLAN53A not only requires external flushing and isolation fluid (sent from the oil station), but also requires devices such as air bag pressure accumulator and pressure alarm. This not only increases input and operating costs, but also puts forward higher requirements for operation and maintenance personnel.

Utility model content

The purpose of this utility model is to provide a liquid storage tank for mechanical seal flushing to solve the above problems.

In order to achieve the above object, the technical scheme of the utility model is as follows:

A liquid storage tank for mechanical seal flushing, comprising a tank body, wherein, the top of the tank body is provided with a supplementary spacer liquid inlet, a cooling water outlet, a nitrogen pressurization interface and a TI thermometer, and the top of the tank body is provided with There is an on-site pressure gauge, an LSL liquid level low-level switch is provided under the side of the tank, and a cooling water inlet, a discharge port, an insulating fluid inlet and an insulating fluid outlet are installed at the bottom of the tank. The air bag pressure accumulator is removed, and the TI thermometer and LSL liquid level low level switch that can transmit signals remotely are added. The LSL liquid level low level switch and TI thermometer can be transmitted to DCS remotely, so as to judge the operation status of the machine seal auxiliary system: When the low liquid level alarms, it means that the spacer fluid will be used up, reminding the production personnel to replenish the spacer fluid, but when the replenishment is very frequent, check whether the machine seal is leaking; if the temperature alarms, it means that the machine seal is leaking and leaked into the machine. In the tank, it should be shut down for maintenance at this time.

As a preferred solution, a pressure source is connected to the nitrogen pressurization interface, and the pressure source includes a gas source coupler, one end of the gas source coupler is connected to the nitrogen pressurization interface through a gas pipe, and the gas source coupler The other end is connected to a nitrogen main pipe through the trachea. Connect a gas pipe to the top of the liquid storage tank through the nitrogen main pipe, and carry out decompression and water removal and filtration through the gas source in the middle (the pressure can be adjusted according to needs)

As a preferred solution, a manual replenisher is also provided under the side of the tank body. When the spacer fluid is insufficient, it can also be replenished manually.

As a preferred solution, a liquid level sight glass is arranged above the side of the tank body.

The improved mechanical seal flushing scheme PLAN53A does not require external spacer fluid for flushing, nor does it require an airbag accumulator to stabilize the pressure, but uses on-site nitrogen to stabilize the pressure. There is also no pressure alarm device (no need to connect to the central control), but for easy control and practicality, a low-level alarm system with a thermometer and a liquid level switch that can transmit signals remotely is added, thereby providing a guarantee for the stable operation of the mechanical seal auxiliary system.

The beneficial effects of the utility model are mainly reflected in:

The optimized scheme is more economical by comparison, and the operability is also improved compared with the previous ones: not only the delivery pumps, pipes, valves, etc. for sending liquid out (reducing leakage points and cost), but also the airbag storage Pressure device (requires regular inspection and inflation) and pressure alarm device; compared with a single pump, only a thermometer that can transmit signals remotely, a low liquid level switch, and a manual liquid (oil) device are added, and its cost is only in the original plan. One-third of that; the operability is that the sealing liquid pressure of nitrogen gas is adjustable, and each pump of the spacer liquid is isolated and does not affect each other, and it can be replenished manually (equivalent to a spare oil tank).

Description of drawings

Fig. 1 is a structural representation of a liquid storage tank used for mechanical seal flushing in the utility model;

Fig. 2 is the structural representation of pressure source in the utility model;

In the figure: 1. Supplementary spacer liquid inlet; 2. Cooling water outlet; 3. Nitrogen pressurized interface; 4. Page sight glass; 5. Manual replenisher; 6. Cooling water inlet; 7. Drain port; 8. Isolation Liquid inlet; 9. Isolation liquid outlet; 10. LSL liquid level low switch; 11. On-site pressure gauge; 12. TL thermometer; 13. Nitrogen main pipe; The connection part of the pressure interface.

detailed description

Referring to accompanying drawings 1 and 2, a liquid storage tank for mechanical seal flushing includes a tank body, wherein the top of the tank body is provided with a supplementary spacer liquid inlet 1, a cooling water outlet 2, and a nitrogen pressurization port 3 and a TI thermometer 12, an on-site pressure gauge 11 is provided above the side of the tank, an LSL liquid level switch 10 is provided below the side of the tank, and a cooling water inlet 6, a discharge port 7, and an insulating liquid inlet are provided at the bottom of the tank 8 and spacer fluid outlet 9. The air bag pressure accumulator is removed, and the TI thermometer and LSL liquid level low level switch that can transmit signals remotely are added. The LSL liquid level low level switch and TI thermometer can be transmitted to DCS remotely, so as to judge the operation status of the machine seal auxiliary system: When the low liquid level alarms, it means that the spacer fluid will be used up, reminding the production personnel to replenish the spacer fluid, but when the replenishment is very frequent, check whether the machine seal is leaking; if the temperature alarms, it means that the machine seal is leaking and leaked into the machine. In the tank, it should be shut down for maintenance at this time. The side below of the tank body is also provided with a manual replenisher 5. When the spacer fluid is insufficient, it can also be replenished manually. A liquid level sight glass 4 is arranged above the side of the tank body.

During use, the nitrogen pressurization interface 3 of the liquid storage tank is fixedly connected with the connection part of the gas pipe 15 of the pressure source with the nitrogen pressurization interface 3, and the gas pipe 15 passes through the gas source coupler 14 and is connected with the nitrogen main pipe 13. The liquid tank is pressurized with nitrogen.

The present invention mainly uses on-site nitrogen to replace the air bag pressure accumulator to stabilize the pressure to maintain the pressure in the tank always higher than the pump inlet pressure, and then achieve the purpose of cooling and lubricating the machine seal: ① Pressurize the liquid storage tank all the time, the maximum gas pressure Allow 150-200PSI (10-14bar), ② The barrier fluid must be compatible with the process fluid (when the mechanical seal leaks, it is best not to affect the product quality). At the same time, the low pressure alarm device was removed, and a thermometer, a low liquid level switch, and a manual liquid (oil) device were added, and the other parts of the new scheme were only changed in position or connection mode compared with the original scheme. The performance and principle remain unchanged.

Based on the improved mechanical seal flushing scheme PLAN53A of the utility model, it does not need external spacer fluid for flushing, nor does it need an air bag pressure accumulator to stabilize the pressure, but uses the on-site nitrogen to stabilize the pressure. There is also no pressure alarm device (no need to connect to the central control), but for easy control and practicality, a low-level alarm system with a thermometer and a liquid level switch that can transmit signals remotely is added, thereby providing a guarantee for the stable operation of the mechanical seal auxiliary system.

In summary, it is only a preferred embodiment of the present utility model, and is not used to limit the implementation scope of the present utility model. All the shapes, structures, features and spirits described in the claims of the present utility model are equal. Changes and modifications should be included in the scope of claims of the present utility model.

Claims (4)

1. A liquid storage tank for mechanical seal flushing, comprising a tank body, characterized in that, the top of the tank body is provided with a supplementary spacer fluid inlet, a cooling water outlet, a nitrogen pressurization interface and a TI thermometer, the tank body There is an on-site pressure gauge on the upper side of the tank, an LSL liquid level low-level switch is installed on the lower side of the tank, and a cooling water inlet, a discharge port, an insulating fluid inlet and an insulating fluid outlet are installed at the bottom of the tank. 2. The liquid storage tank for mechanical seal flushing according to claim 1, wherein a pressure source is connected to the nitrogen pressurization interface, and the pressure source includes a gas source coupler, and the gas source One end of the two pieces is connected to the nitrogen pressurized interface through the air pipe, and the other end of the two pieces of gas source is connected to a nitrogen main pipe through the air pipe. 3. The liquid storage tank for mechanical seal flushing according to claim 1, characterized in that a manual replenisher is provided under the side of the tank body. 4 . The liquid storage tank for flushing mechanical seals according to claim 1 , wherein a liquid surface sight glass is arranged above the side of the tank body.