Styrene medium pump mechanical seal anti-polymerization device

Abstract

The utility model discloses an anti-polymerization device for a styrene medium pump mechanical seal, which belongs to the technical field of anti-polymerization devices and comprises a styrene medium pump mechanical seal, a sealing liquid inlet pipeline is arranged at the bottom of the styrene medium pump mechanical seal, a liquid pump is arranged on the sealing liquid inlet pipeline, and a secondary sealing liquid tank is connected onto the sealing liquid inlet pipeline. The chilled water inlet pipeline is connected with the bottom of the heat exchange pipe, the chilled water outlet pipeline is arranged on the upper portion of the second-stage sealing liquid tank and connected with the upper portion of the heat exchange pipe, the sealing liquid outlet pipeline is arranged on the upper portion of the styrene medium pump mechanical seal and connected with the second-stage sealing liquid tank, and sealing liquid is polyethylbenzene residual oil. According to the styrene medium pump mechanical seal, styrene in the secondary sealing cavity in the styrene medium pump mechanical seal is diluted and cooled, so that the secondary sealing cavity in the styrene medium pump mechanical seal is smooth and not blocked any more, and the problem of fire disasters caused by high temperature due to blockage in the styrene medium pump mechanical seal is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-polymerization devices, in particular to a styrene medium pump sealing anti-polymerization device. Background Art

[0002] In the styrene device, the styrene medium pump needs to be sealed by injecting sealing liquid into the mechanical seal of the medium pump. However, due to the loose sealing of the primary sealing ring of the styrene medium pump, the styrene medium leaks into the secondary sealing cavity of the mechanical seal. Since styrene is in a non-flowing state in the dead zone of the secondary sealing area for a long time, the sealing liquid in the prior art cannot dilute and cool the styrene, and polymerization is prone to occur, resulting in blockage of the secondary seal and flushing pipeline, causing failure of the mechanical seal. In addition, due to the polymerization and blockage of the secondary seal and flushing pipeline, the heat generated by the operation of the dynamic and static rings of the mechanical seal cannot be transferred to the external cooling medium through the sealing liquid, or the inner ring of the dynamic and static rings of the mechanical seal rubs against the shaft sleeve after polymerization to generate high temperature, resulting in a sharp increase in the temperature of the pump mechanical seal, which will seriously cause a fire. Utility Model Content

[0003] In order to solve the technical problems mentioned in the above background technology, the utility model provides a styrene medium pump sealing anti-polymerization device, and the technical solution adopted is as follows:

[0004] It includes a styrene medium pump seal, which is characterized in that a sealing liquid inlet pipeline is provided at the bottom of the styrene medium pump seal, a liquid pump is provided on the sealing liquid inlet pipeline, a secondary sealing liquid tank is connected to the sealing liquid inlet pipeline, a heat exchange tube is provided in the secondary sealing liquid tank, a chilled water inlet pipeline is provided at the bottom of the secondary sealing liquid tank, the chilled water inlet pipeline is connected to the bottom of the heat exchange tube, a chilled water outlet pipeline is provided on the upper part of the secondary sealing liquid tank, the chilled water outlet pipeline is connected to the upper part of the heat exchange tube, a sealing liquid outlet pipeline is provided on the upper part of the styrene medium pump seal, the sealing liquid outlet pipeline is connected to the secondary sealing liquid tank, and the sealing liquid is polyethylbenzene residual oil.

[0005] Preferably, a temperature controller is provided on the secondary sealing liquid tank, and a regulating valve is provided on the chilled water inlet pipeline.

[0006] Preferably, an online analyzer is provided on the sealing liquid outlet pipeline.

[0007] Preferably, the temperature of the chilled water in the chilled water inlet pipeline is 3-5°C.

[0008] Preferably, the liquid level height in the secondary sealed liquid tank ranges from 1 / 3 to 4 / 5.

[0009] The utility model has the following advantages: traditional sealing liquid is replaced by polyethylbenzene residual oil, the polyethylbenzene residual oil is injected into the secondary sealing liquid tank, and at the same time, chilled water is introduced into the heat exchange tube to perform heat exchange with the polyethylbenzene residual oil in the secondary sealing liquid tank to cool the polyethylbenzene residual oil, and then the cooled polyethylbenzene residual oil is sent into the secondary sealing cavity in the styrene medium pump machine seal, and is mixed with styrene while sealing the secondary sealing cavity in the styrene medium pump machine seal to dilute and cool the styrene. The utility model dilutes and cools the styrene in the secondary sealing cavity in the styrene medium pump machine seal, so that the secondary sealing cavity in the styrene medium pump machine seal is unobstructed and no longer blocked, thereby avoiding the problem of fire caused by blockage and high temperature in the styrene medium pump machine seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the utility model.

[0011] Figures: 1 styrene medium pump seal, 2 sealing liquid inlet pipeline, 3 liquid pump, 4 secondary sealing liquid tank, 5 heat exchange tube, 6 chilled water inlet pipeline, 7 chilled water outlet pipeline, 8 sealing liquid outlet pipeline, 9 temperature controller, 10 regulating valve, 11 online analyzer. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0013] Example

[0014] like Figure 1 As shown:

[0015] The utility model provides a styrene medium pump machine seal anti-polymerization device, comprising a styrene medium pump machine seal 1, characterized in that a sealing liquid inlet pipeline 2 is arranged at the bottom of the styrene medium pump machine seal 1, a liquid pump 3 is arranged on the sealing liquid inlet pipeline 2, a secondary sealing liquid tank 4 is connected to the sealing liquid inlet pipeline 2, the sealing liquid is injected into the secondary sealing liquid tank 4, and is sent into the secondary sealing cavity of the styrene medium pump machine seal 1 through the liquid pump 3, a heat exchange tube 5 is arranged in the secondary sealing liquid tank 4, a chilled water inlet pipeline 6 is arranged at the bottom of the secondary sealing liquid tank 4, the chilled water inlet pipeline 6 is connected to the bottom of the heat exchange tube 5, and the chilled water inlet pipeline 6 is connected to the bottom of the heat exchange tube 5. Water enters the heat exchange tube 5 through the chilled water inlet pipe 6. A chilled water outlet pipe 7 is provided on the upper part of the secondary sealing liquid tank 4. The chilled water after heat exchange comes out through the chilled water pipe 7. The chilled water outlet pipe 7 is connected to the upper part of the heat exchange tube 5. A sealing liquid outlet pipe 8 is provided on the upper part of the styrene medium pump seal 1. The sealing liquid outlet pipe 8 is connected to the secondary sealing liquid tank 4. The sealing liquid is polyethylbenzene residual oil. The cooled sealing liquid enters the secondary sealing cavity of the styrene medium pump seal 1 to cool and dilute the styrene in the secondary sealing cavity, and then comes out through the sealing liquid outlet pipe 8 and enters the secondary sealing liquid tank 4.

[0016] It is worth pointing out that polyethylbenzene residual oil can effectively reduce the polymerization rate and molecular weight of styrene, thereby achieving the anti-polymerization of styrene medium pump sealing.

[0017] A temperature controller 9 is provided on the secondary sealing liquid tank 4 , and a regulating valve 10 is provided on the chilled water inlet pipeline 6 . The opening of the regulating valve 10 is controlled by the temperature controller 9 .

[0018] An online analyzer 11 is provided on the sealing liquid outlet pipeline 8 to monitor the styrene concentration in the sealing liquid coming out of the sealing liquid outlet pipeline 8. When the styrene concentration reaches a set value, the sealing liquid in the secondary sealing liquid tank 4 is discharged and new sealing liquid is re-injected.

[0019] The temperature of the chilled water in the chilled water inlet pipe 6 is 3-5°C, which is moderate. If the temperature is too high, it will not have a cooling effect on the sealing liquid, and if the temperature is too low, it will affect the production of styrene.

[0020] The liquid level height range in the secondary sealed liquid tank 4 is 1 / 3-4 / 5, so as to avoid the liquid level in the secondary sealed liquid tank 4 being too high, which would cause excessive pressure in the secondary sealed liquid tank 4 .

[0021] The working principle of the utility model is as follows:

[0022] Polyethylbenzene residual oil is injected into the secondary sealing liquid tank 4 as a sealing liquid, and chilled water enters the heat exchange tube 5 through the chilled water inlet pipe 6 to perform heat exchange with the polyethylbenzene residual oil in the secondary sealing liquid tank 4 to cool the polyethylbenzene residual oil. The chilled water after heat exchange enters the chilled water outlet pipe 7 through the heat exchange pipe 5 for discharge. Under the action of the liquid pump 3, the cooled polyethylbenzene residual oil in the secondary sealing liquid tank 4 enters the secondary sealing cavity in the styrene medium pump machine seal 1 through the sealing liquid inlet pipe 2, and seals the secondary sealing cavity while mixing with the styrene remaining in the secondary sealing cavity, so that the styrene is diluted, cooled, and brought out by the polyethylbenzene residual oil into the sealing liquid outlet pipe 8, and then enters the secondary sealing liquid tank 4 for circulation.

[0023] The utility model is simple to operate and convenient to use, and is suitable for comprehensive promotion and application. Although the embodiments of the utility model have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the utility model, and the scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A styrene medium pump seal anti-polymerization device, comprising a styrene medium pump seal (1), characterized in that: A sealing liquid inlet pipeline (2) is arranged at the bottom of the styrene medium pump machine seal (1), a liquid pump (3) is arranged on the sealing liquid inlet pipeline (2), a secondary sealing liquid tank (4) is connected to the sealing liquid inlet pipeline (2), a heat exchange tube (5) is arranged in the secondary sealing liquid tank (4), a chilled water inlet pipeline (6) is arranged at the bottom of the secondary sealing liquid tank (4), the chilled water inlet pipeline (6) is connected to the bottom of the heat exchange tube (5), a chilled water outlet pipeline (7) is arranged on the upper part of the secondary sealing liquid tank (4), the chilled water outlet pipeline (7) is connected to the upper part of the heat exchange tube (5), a sealing liquid outlet pipeline (8) is arranged on the upper part of the styrene medium pump machine seal (1), the sealing liquid outlet pipeline (8) is connected to the secondary sealing liquid tank (4), and the sealing liquid is polyethylbenzene residual oil.

2. A styrene medium pump sealing and anti-polymerization device according to claim 1, characterized in that: A temperature controller (9) is provided on the secondary sealed liquid tank (4), and a regulating valve (10) is provided on the chilled water inlet pipeline (6).

3. A styrene medium pump sealing and anti-polymerization device according to claim 1, characterized in that: An online analyzer (11) is arranged on the sealing liquid outlet pipeline (8).

4. A styrene medium pump sealing and anti-polymerization device according to claim 1, characterized in that: The temperature of the chilled water in the chilled water inlet pipeline (6) is 3-5°C.

5. A styrene medium pump sealing and anti-polymerization device according to claim 1, characterized in that: The liquid level height range in the secondary sealed liquid tank (4) is 1 / 3-4 / 5.

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