CN219008741U

CN219008741U - Nitrogen sealing protection device for toluene storage tank

Info

Publication number: CN219008741U
Application number: CN202222987941.1U
Authority: CN
Inventors: 车明龙; 彭波
Original assignee: Hubei Shanshui Chemical Co ltd
Current assignee: Hubei Shanshui Chemical Co ltd
Priority date: 2022-11-07
Filing date: 2022-11-07
Publication date: 2023-05-12
Anticipated expiration: 2032-11-07

Abstract

The utility model provides a toluene storage tank nitrogen seal protection device which comprises a toluene storage tank, wherein a toluene storage tank pipeline is connected with a unloading crane pipe, the unloading crane pipe is provided with a crane pipe connecting valve, a pipeline from the unloading crane pipe to the toluene storage tank is sequentially provided with a previous pump valve, a toluene pump and a first tank inlet valve, a purging pipeline is further connected to a connecting pipeline between the previous pump valve and the unloading crane pipe, the purging pipeline is connected with a nitrogen source, and the nitrogen source is further provided with a nitrogen valve. According to the utility model, the purging pipeline is arranged, and residual toluene in the pipeline can be purged through nitrogen of the purging pipeline after each toluene unloading operation is completed, so that nitrogen seal protection is realized.

Description

Nitrogen sealing protection device for toluene storage tank

Technical Field

The utility model belongs to the field of organic chemical industry, and particularly relates to a nitrogen seal protection device for a toluene storage tank.

Background

In the prior art, after the toluene unloading is finished, a large amount of toluene liquid can remain in the pipeline, and in high-temperature weather, liquid toluene which is not treated in time is extremely easy to vaporize, so that the pressure in the pipeline is increased, toluene leakage accidents are easy to occur, and hidden danger is caused to production safety.

Disclosure of Invention

Aiming at the defects existing in the prior art, the utility model provides a nitrogen seal protection device for a toluene storage tank, which can clean a pipeline through nitrogen so as to remove toluene in the pipeline and protect the toluene storage tank.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a toluene storage tank nitrogen seal protection device, includes the toluene storage tank, toluene storage tank pipe connection has the crane pipe of unloading, and the crane pipe of unloading is equipped with the crane pipe connecting valve, is equipped with pump last time valve, toluene pump and first tank inlet valve on the pipeline of crane pipe to toluene storage tank of unloading in proper order, still be connected with on the connecting line between pump last time valve and the crane pipe of unloading and sweep the pipeline, it has the nitrogen gas source to sweep the pipeline connection, the nitrogen gas source still is equipped with the nitrogen gas valve.

Further, a breather valve is also arranged at the top of the toluene storage tank.

Further, an outlet of the toluene pump is provided with a first check valve.

Further, a pressure variable valve is arranged on the pipeline between the first check valve and the first tank inlet valve, and the pressure variable valve is connected with a pressure transmitter.

Further, a second tank inlet valve is arranged on the pipeline between the first tank inlet valve and the toluene storage tank.

Further, the purge conduit is also fitted with a second check valve located on the conduit on the outlet side of the nitrogen valve.

Further, a self-operated pressure regulating valve is arranged between the second check valve and the nitrogen valve.

Further, a pressure gauge is arranged between the self-operated pressure regulating valve and the second check valve.

Further, the pipeline between the previous valve of the pump and the toluene pump is also connected with an evacuation pipeline, and the evacuation pipeline is provided with a drain valve.

Further, a pump front secondary valve is arranged between the connection part of the connecting pipeline between the pump front primary valve and the unloading crane pipe and the purging pipeline and the pump front primary valve.

Compared with the prior art, the utility model has the beneficial effects that: through setting up the pipeline that sweeps, can sweep the pipeline the inside residual toluene of nitrogen gas through the pipeline that sweeps after the operation of unloading of toluene at every turn is accomplished to realize nitrogen seal protection.

Drawings

FIG. 1 is a schematic diagram of a toluene unloading operation in accordance with an embodiment of the present utility model;

FIG. 2 is a schematic diagram of the structure of an embodiment of the present utility model under purging pipeline conditions;

in the drawings, the list of components represented by the various numbers is as follows:

1. toluene storage tank, 2, unloading oil filling riser, 3, oil filling riser connecting valve, 4, pump previous valve, 5, toluene pump, 6, first tank inlet valve, 7, nitrogen source, 8, nitrogen valve, 9, breather valve, 10, first check valve, 11, pressure change valve, 12, pressure transmitter, 13, second tank inlet valve, 14, second check valve, 15, self-operated pressure regulating valve, 16, manometer, 17, drain valve, 18, pump previous secondary valve, 19, toluene tank wagon, 20, collecting vessel.

Detailed Description

The present utility model will be described in further detail with reference to specific examples so as to more clearly understand the present utility model by those skilled in the art.

As shown in figure 1, a toluene storage tank nitrogen seal protection device comprises a toluene storage tank 1, wherein the bottom of the toluene storage tank 1 is connected with an adjacent para-chlorotoluene removing device of a subsequent toluene treatment process, the toluene storage tank 1 is connected with a discharge crane pipe 2 in a pipeline, the discharge crane pipe 2 is provided with a crane pipe connecting valve 3, a pipeline from the discharge crane pipe 2 to the toluene storage tank 1 is sequentially provided with a previous pump valve 4, a toluene pump 5 and a first tank inlet valve 6, a purging pipeline is further connected to a connecting pipeline between the previous pump valve 4 and the discharge crane pipe 2, the purging pipeline is connected with a nitrogen source 7, and the nitrogen source is further provided with a nitrogen valve 8.

Under the working condition of toluene unloading, referring to fig. 1, a nitrogen valve 8 is closed, a loading arm 2 is connected with a toluene tank wagon 19, a loading arm connecting valve 3, a pump previous valve 4 and a first tank inlet valve 6 are opened, a toluene pump 5 is started, and toluene of the toluene tank wagon 7 is conveyed into a toluene storage tank 1.

Under the purging working condition, referring to fig. 2, the toluene pump 5 is closed, the crane pipe connecting valve 3 and the previous valve 4 are closed, the connection between the unloading crane pipe 2 and the toluene tank wagon 19 is disconnected, the unloading crane pipe 2 is connected into the collecting barrel 8, the crane pipe connecting valve 3 is opened, the nitrogen valve 8 is opened, nitrogen enters the pipeline for conveying toluene through the purging pipeline, residual liquid toluene in the pipeline is purged, and part of residual toluene is purged into the collecting barrel 8. After purging, the nitrogen valve 8, the crane pipe connecting valve 3, the pump previous valve 4 and the first tank inlet valve 6 are closed, then the nitrogen valve 8 is opened, the rest residual toluene in the pipeline is purged into the toluene storage tank 1, after purging, the nitrogen valve 8 is closed, and the residual nitrogen in the pipeline plays a role in protecting the pipeline and the storage tank from nitrogen.

The breather valve 9 is also installed at the top of toluene storage tank 1, under the purge condition, nitrogen gas and toluene get into the toluene storage tank, and the continuous inflow of nitrogen gas can make the pressure grow of toluene storage tank 1, through setting up breather valve 9, discharges partial nitrogen gas when the pressure of toluene storage tank 1 is too big, guarantees the safety of toluene storage tank 1.

The outlet of the toluene pump 5 is provided with a first check valve 10 to prevent toluene and nitrogen from flowing backward to damage the toluene pump.

The pipeline between the first check valve 10 and the first tank inlet valve 6 is also provided with a pressure change valve 11, and the pressure change valve 11 is connected with a pressure transmitter 12 to detect the pressure of the toluene flow output by the toluene pump 5.

The pipeline between the first tank inlet valve 6 and the toluene storage tank 1 is further provided with a second tank inlet valve 13, and the second tank inlet valve 13 is synchronous with the first tank inlet valve 6 in switching, so that the pipeline can be divided into a plurality of sections by adopting two tank inlet valves, and when pipeline leakage occurs, the pipeline is cut off by closing the tank inlet valve, so that the pipeline is convenient to maintain and replace in sections.

The purge line is also fitted with a second check valve 14, the second check valve 14 being located on the line on the outlet side of the nitrogen valve 8, preventing toluene from flowing back into the purge line.

The self-operated pressure regulating valve 15 is arranged between the second check valve 14 and the nitrogen valve 8, the pressure before the valve of the self-operated pressure regulating valve 15 is 0.4MPa, the pressure after the valve is 700Pa, after the residual toluene in the pipeline is purged into the toluene storage tank, the nitrogen pressure blocking is formed in the pipeline, and the safety of toluene storage is ensured.

A pressure gauge 16 is provided between the self-operated pressure regulating valve 15 and the second check valve 14 to detect the valve back pressure of the self-operated pressure regulating valve 15.

The pipeline between the previous valve 4 and the toluene pump 5 is also connected with an evacuation pipeline, the evacuation pipeline is provided with a drain valve 17, and when the pipeline fails, the drain valve 17 is opened to drain and collect accumulated liquid in the pipeline, so that the maintenance is convenient.

The connecting pipeline between the pump front valve 4 and the unloading crane pipe 2 and the connecting part of the purging pipeline are also provided with the pump front secondary valve 18 between the pump front valve 4, so that the pipeline can be divided into a plurality of sections by adopting the two pump front valves, and when the pipeline leaks, the pump front valve is closed to cut off the pipeline, thereby facilitating the sectional maintenance and replacement.

Mechanisms, components, and members not described in the specific structure of the present utility model are all existing structures already existing in the prior art. Can be purchased directly from the market.

The foregoing is merely a preferred embodiment of the present utility model, and is not intended to limit the scope of the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. The utility model provides a toluene storage tank nitrogen seal protection device, includes toluene storage tank (1), toluene storage tank (1) pipe connection has unloading oil filling riser (2), and unloading oil filling riser (2) are equipped with oil filling riser connecting valve (3), are equipped with pump last time valve (4), toluene pump (5) and first tank valve (6) of going into on the pipeline of unloading oil filling riser (2) to toluene storage tank (1) in proper order, a serial communication port, still be connected with on the connecting tube between valve (4) and unloading oil filling riser (2) before the pump and sweep the pipeline, it has nitrogen gas source (7) to sweep the pipeline connection, the nitrogen gas source still is equipped with nitrogen valve (8).

2. The toluene storage tank nitrogen seal protection device according to claim 1, wherein a breather valve (9) is further arranged at the top of the toluene storage tank (1).

3. The toluene tank nitrogen seal protection device according to claim 1, characterized in that the outlet of the toluene pump (5) is provided with a first check valve (10).

4. A toluene tank nitrogen seal protection device according to claim 3, characterized in that a pressure change valve (11) is further arranged on a pipeline between the first check valve (10) and the first tank inlet valve (6), and the pressure change valve (11) is connected with a pressure transmitter (12).

5. The toluene tank nitrogen seal protection device according to claim 4, characterized in that the pipeline between the first tank inlet valve (6) and the toluene tank (1) is also provided with a second tank inlet valve (13).

6. The toluene tank nitrogen seal protection device according to claim 1, characterized in that the purge pipe is further fitted with a second check valve (14), the second check valve (14) being located on the pipe on the outlet side of the nitrogen valve (8).

7. The nitrogen seal protection device for the toluene storage tank according to claim 6, wherein a self-operated pressure regulating valve (15) is arranged between the second check valve (14) and the nitrogen valve (8).

8. The toluene tank nitrogen seal protection device according to claim 7, wherein a pressure gauge (16) is arranged between the self-operated pressure regulating valve (15) and the second check valve (14).

9. The toluene storage tank nitrogen seal protection device according to claim 1, wherein a pipeline between the pump previous valve (4) and the toluene pump (5) is also connected with an evacuation pipeline, and the evacuation pipeline is provided with a drain valve (17).

10. The toluene storage tank nitrogen seal protection device according to claim 1, wherein a pump front secondary valve (18) is further arranged between the connection part of the connecting pipeline between the pump front primary valve (4) and the unloading crane pipe (2) and the purging pipeline and the pump front primary valve (4).