CN115479041A

CN115479041A - Pump mechanical seal cooling structure and online cleaning method

Info

Publication number: CN115479041A
Application number: CN202211190760.4A
Authority: CN
Inventors: 柴金龙; 张海杰; 王波; 梁艳文; 王作槐; 刘虎; 刘明望; 史荣; 冯中毅
Original assignee: Chongqing Carbinol Chemical Industry Co ltd
Current assignee: Chongqing Carbinol Chemical Industry Co ltd
Priority date: 2022-09-28
Filing date: 2022-09-28
Publication date: 2022-12-16

Abstract

The utility model provides a pump machine seals cooling structure, includes first pipeline, second pipeline, cooler, the upstream end of first pipeline links to each other with the pump export, and the process medium passageway import of downstream end and cooler links to each other, sets up first normally open valve on this first pipeline, the upstream end of second pipeline links to each other with the process medium passageway export of cooler, and the cooling chamber intercommunication that the downstream end and pump machine sealed sets up on the second pipeline and leads the shower valve. The pump seal online cleaning device is simple in structure and low in modification cost, can quickly and flexibly achieve online cleaning of the pump seal on the basis of ensuring the cooling effect of the pump seal, effectively meets the actual requirements of enterprises, can be used for online cleaning of the pump seal, is simple and convenient to operate, does not need extra power or cleaning agents, and is an efficient online cleaning method.

Description

Pump mechanical seal cooling structure and online cleaning method

Technical Field

The invention relates to the field of chemical industry, in particular to a pump mechanical seal cooling structure and an online cleaning method.

Background

The pressure of a process medium inlet of a circulating water pump matched with a pipeline of a chemical enterprise is higher and reaches 22 kilograms, and the process medium is a mixture of dust-containing water, impurity precipitated oil and process condensate and has higher impurity content. In order to save space and cost, enterprises generally directly adopt high-pressure process media (25-28 kg) at the outlet of a circulating pump, and the high-pressure process media are cooled to be taken as cooling media to enter a cooling cavity of a mechanical seal, and the cooling cavity corresponds to a sealing surface of the mechanical seal to take away heat generated by friction and enter a pump body. However, the process medium has a high impurity content, so that the machine cover of the circulating water pump is abraded due to more impurities deposited on the machine cover, the process medium leaks out along the machine cover under the self-pressure extrusion, the field pollution is caused, and the machine cover needs to be frequently stopped to be maintained.

Therefore, how to effectively prevent the machine cover from being worn due to deposited impurities on the basis of not changing the machine seal cooling water source for the pump is a problem to be solved by the technical personnel in the field.

Disclosure of Invention

One of the purposes of the invention is to provide a pump mechanical seal cooling structure aiming at the defects of the prior art, the structure is simple, the cost is improved, the purpose of quickly and flexibly cleaning the pump mechanical seal on line can be realized on the basis of ensuring the pump mechanical seal cooling effect, and the actual requirements of enterprises can be effectively met.

The invention also aims to provide a method for cleaning the pump mechanical seal on line by utilizing the pump mechanical seal cooling mechanism, which is simple and convenient to operate, does not need additional power or cleaning agent, and is an efficient online cleaning method.

The technical scheme for realizing one purpose of the invention is as follows: the utility model provides a pump machine seals cooling structure, includes first pipeline, second pipeline, cooler, the upstream end of first pipeline links to each other with the pump export, and the process medium passageway import of downstream end and cooler links to each other, sets up first normally open valve on this first pipeline, the upstream end of second pipeline links to each other with the process medium passageway export of cooler, and the cooling chamber intercommunication that the downstream end and pump machine sealed sets up on the second pipeline and leads the shower valve.

The cooler is a tube type heat exchanger, the shell side of the tube type heat exchanger is a cooling medium channel, and the tube side of the tube type heat exchanger is a process medium channel.

And a water bucket is arranged below the spray guide valve.

Preferably, a second normally open valve is arranged on the second pipeline, and the second normally open valve is close to the pump mechanical seal.

The second technical scheme for realizing the purpose of the invention is as follows: an on-line cleaning method for a pump mechanical seal adopts any one of the pump mechanical seal cooling structures, and comprises the following steps:

1) Closing the first normally open valve, and opening the pilot valve to quickly discharge the process medium in the pump through a cooling cavity, a second pipeline and the pilot valve which are mechanically sealed by the pump;

2) And closing the pilot valve, and opening the first normally open valve to complete the on-line cleaning of the mechanical seal for the pump.

Preferably, the opening time of the pilot valve in the step 1) is 5-10s.

Preferably, after the first normally open valve is closed in step 1), the second normally open valve is closed, the pilot valve is opened, and the second normally open valve is opened again.

Preferably, step 2) closes the second normally open valve, closes the pilot valve, and opens the first normally open valve and the second normally open valve.

Adopt above-mentioned technical scheme to have following beneficial effect:

1. pump machine seals cooling structure includes first pipeline, second pipeline, cooler. The upstream end of the first pipeline is connected with the outlet of the pump, the downstream end of the first pipeline is connected with the inlet of the process medium channel of the cooler, and the first pipeline is provided with a first normally open valve, namely, under the normal condition, part of high-pressure process medium enters the first pipeline and enters the process medium channel of the cooler to be subjected to cooling treatment and serves as cooling medium for the pump mechanical seal. The upstream end of second pipeline links to each other with the technology medium passageway export of cooler, the low reaches end communicates with the cooling chamber that pump machine sealed, set up the pilot valve on the second pipeline, under the normal condition, the pilot valve is in closed condition, the high pressure technology medium through cooling processing advances the second pipeline and gets into the cooling chamber that pump machine sealed, absorb the heat that pump machine sealed face produced, and because the pressure of high pressure technology medium is greater than the pressure of technology medium in the pump, under the effect of the less differential pressure between the two, in the high pressure technology medium carries the heat entering pump, mix with technology medium in the pump, reach the cooling mesh to pump machine sealed. The cooling structure has few parts, simple connection relation and low modification cost, and can be widely applied to pump mechanical seals matched with process medium pipelines with higher pressure and turbidity. When the cooling structure is used for cleaning the pump mechanical seal on line, the first normally open valve is closed, the cooling structure is disconnected with a high-pressure process medium, the pilot valve is opened and communicated with the atmosphere, so that a large pressure difference (far greater than the pressure difference between the pump outlet high-pressure process medium and the pump inner process medium) is formed between the pump mechanical seal cooling cavity and the pilot valve, under the action of the large pressure difference, part of the process medium (22 kg pressure) in the pump is rapidly discharged out of the cooling cavity, the second pipeline and the pilot valve, in the rapid discharging process, the pump mechanical seal sealing surface and the cooling cavity are efficiently washed, deposited impurities are washed out, the pump mechanical seal is discharged out of the pump mechanical seal through the second pipeline and the pilot valve, the online cleaning purpose is realized only by seconds, the cleaning efficiency is high, the cost is low, and the method is an efficient and safe online cleaning method. After the online cleaning is finished, the pilot valve is closed, the first normally open valve is opened, the process medium in the pump cannot flow out, and the high-pressure process medium at the outlet of the pump enters the pump under the pressure difference, so that the process medium can be converted into a normal cooling structure.

2. And a water bucket is arranged below the pilot valve and used for receiving process media discharged by the pilot valve in the online cleaning process so as to avoid field pollution caused by the process media.

3. Be provided with the second normally open valve on the second pipeline, the second normally open valve is close to the pump machine to be sealed, and under the normal conditions, the second normally open valve is in the open mode, when meetting special circumstances, needs to overhaul or in order to protect the guide shower valve, can close the second normally open valve, satisfies the actual demand of enterprise.

4. The on-line cleaning method comprises the steps of 1) closing the first normally-open valve, closing the second normally-open valve, opening the pilot valve, and then opening the second normally-open valve, so that the resistance is small when the pilot valve is opened, the service life of the pilot valve is prolonged, the risk of damage to maintenance personnel caused by high-speed process media discharged from the pilot valve can be effectively reduced, and the actual requirements of enterprises are met.

5. In the on-line cleaning method, the second normally open valve is closed in the step 2), then the pilot valve is closed, and the first normally open valve and the second normally open valve are opened, so that the resistance is small when the pilot valve is closed, the service life of the pilot valve is prolonged, the risk of damage of high-speed process media discharged from the pilot valve to maintenance personnel can be effectively reduced, and the actual requirements of enterprises are met.

The applicant verifies that the pump mechanical seal cooling structure and the online cleaning method modified by the invention can effectively prevent the abrasion of the sealing surface due to deposited impurities on the basis of ensuring the normal cooling of the pump mechanical seal, so that the maintenance period of the pump mechanical seal from several days to half a month is prolonged to 2-3 months, and the maintenance work intensity and frequency are greatly reduced.

The following further description is made with reference to the accompanying drawings and detailed description.

Drawings

FIG. 1 is a schematic connection diagram of the present invention.

In the drawing, 1 is a first pipeline, 2 is a second pipeline, 3 is a cooler, 4 is a water bucket, a is a first normally open valve, b is a second normally open valve, and c is a shower valve.

Detailed Description

Example 1

Referring to fig. 1, the mechanical seal cooling structure for the pump includes a first pipeline 1, a second pipeline 2, and a cooler 3, where, in general, the first pipeline and the second pipeline have the same specification, the cooler employs a tube type heat exchanger, a shell pass of the tube type heat exchanger is a cooling medium channel, and a tube pass of the tube type heat exchanger is a process medium channel. The upstream end of the first pipeline 1 is connected with the pump outlet, the pressure of the high-pressure process medium in the pump outlet reaches 25-28 kg, the downstream end of the first pipeline is connected with the process medium channel inlet of the cooler 3, and the first pipeline 1 is provided with a first normally-open valve a. The upstream end of the second pipeline 2 is connected with the outlet of the process medium channel of the cooler 3, the downstream end is communicated with the cooling cavity of the pump mechanical seal, and the second pipeline 2 is provided with a second normally open valve and a pilot shower valve c, wherein the second normally open valve is close to the pump mechanical seal, the pilot shower valve is close to the cooler, and a bucket 4 is arranged below the pilot shower valve c.

When the cooling function is normally exerted, the first normally open valve and the second normally open valve are both in an open state, the pilot valve is in a closed state, and normal-temperature water is used as a cooling medium to move away from the shell side. High-pressure process medium (25-28 kg) at the outlet of the pump enters a cooler through a first pipeline, is discharged into a cooling cavity of the pump mechanical seal through a second pipeline after being cooled, absorbs heat generated by a sealing surface of the pump mechanical seal, and carries heat to enter the pump under the action of small pressure difference between the high-pressure process medium and the pump because the pressure of the high-pressure process medium is greater than the pressure of the process medium (22 kg) in the pump, so that the high-pressure process medium is mixed with the process medium in the pump, and the aim of cooling the pump mechanical seal is fulfilled.

Example 2

The on-line cleaning method for the pump mechanical seal adopts the pump mechanical seal cooling structure of the embodiment 1, and comprises the following steps:

1) Closing the first normally open valve a, closing the second normally open valve b, opening the pilot valve c, and then opening the second normally open valve b, so that a huge pressure difference exists between the pump mechanically-sealed cooling cavity and the pilot valve, the pressure difference is about 21 kilograms, under the action of a higher differential pressure, the process medium in the pump is rapidly discharged through the pump mechanically-sealed cooling cavity, the second pipeline 2 and the pilot valve c, and the opening time of the pilot valve is usually 5-10s;

2) And closing the second normally-open valve b, closing the pilot valve c, and opening the first normally-open valve a and the second normally-open valve b to complete the on-line cleaning of the pump seal.

Claims

1. The utility model provides a pump is with machine seal cooling structure which characterized in that: comprises a first pipeline (1), a second pipeline (2) and a cooler (3), wherein the upstream end of the first pipeline (1) is connected with an outlet of a pump, the downstream end of the first pipeline is connected with an inlet of a process medium channel of the cooler (3), the first pipeline (1) is provided with a first normally open valve (a),

the upstream end of the second pipeline (2) is connected with the outlet of the process medium channel of the cooler (3), the downstream end of the second pipeline is communicated with the cooling cavity of the pump mechanical seal, and the second pipeline (2) is provided with a pilot valve (c).

2. The mechanical seal cooling structure for pump according to claim 1, characterized in that: the cooler (3) is a tube type heat exchanger, the shell side of the tube type heat exchanger is a cooling medium channel, and the tube side of the tube type heat exchanger is a process medium channel.

3. The mechanical seal cooling structure for pump according to claim 1, wherein: a water bucket (4) is arranged below the guide shower valve (c).

4. The mechanical seal cooling structure for pump according to claim 1, wherein: and a second normally open valve (b) is arranged on the second pipeline (2), and the second normally open valve (b) is close to the mechanical seal for the pump.

5. An on-line cleaning method for a pump mechanical seal, which is characterized in that a cooling structure of the pump mechanical seal according to any one of claims 1 to 4 is adopted, and the method comprises the following steps:

1) Closing the first normally open valve (a), and opening the pilot valve (c) to quickly discharge the process medium in the pump through a cooling cavity sealed by the pump, the second pipeline (2) and the pilot valve (c);

2) And (c) closing the pilot valve (c), and opening the first normally-open valve (a) to finish the on-line cleaning of the pump seal.

6. The on-line cleaning method according to claim 5, wherein the opening time of the pilot valve (c) in step 1) is 5-10s.

7. The on-line cleaning method according to claim 5, wherein step 1) closes the first normally open valve (a), closes the second normally open valve (b), opens the pilot valve (c), and opens the second normally open valve (b).

8. The on-line cleaning method according to claim 5, wherein step 2) closes the second normally open valve (b), closes the pilot valve (c), and opens the first normally open valve (a) and the second normally open valve (b).