Improved structure for reducing TEAL hydrocarbon oil at inlet of propylene gas circulation compressor

Abstract

The utility model provides an improved structure for reducing TEAL hydrocarbon oil at an inlet of a propylene gas circulating compressor. The improved structure comprises a low-pressure propylene washing tower, a compressor separating tank, a first inlet filter, a second inlet filter, the propylene gas circulating compressor, a feeding pump, a TEAL-containing waste oil collecting tank and a reflux pump, a bottom outlet pipeline of the first inlet filter is connected with an inlet pipeline of the feeding pump; a bottom outlet pipeline of the second inlet filter is connected with an inlet pipeline of the feeding pump; the high-concentration hydrocarbon oil containing TEAL can be prevented from being in direct contact with air in the direct discharge process, personnel injury caused by direct contact with human bodies in the on-site discharge process is avoided, environmental pollution caused by hydrocarbon oil volatilization in the on-site discharge process is avoided, and environmental pollution caused by scattering on the ground in the on-site discharge process is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical engineering, and particularly relates to an improved structure for reducing TEAL hydrocarbon oil at the inlet of a propylene gas recycle compressor. Background Art

[0002] In the polypropylene ST process, the polymer is discharged from the bottom of the loop reactor in the form of a slurry, enters the flash tank through the large flash line, and the vaporized liquid-phase propylene in the flash tank is recovered through washing and cooling from the top to the high-pressure recovery system. The polymer is in the form of powder and goes to the bag filter from the bottom. The unvaporized propylene carried in the powder enters the bag filter and is vaporized again rapidly after the pressure drops. The gaseous propylene goes out from the top of the bag filter, is washed and then enters the recycle gas compressor for recovery. During the reaction process, a large amount of TEAL-containing liquid-phase hydrocarbon oil accumulates at the bottom of the inlet filter. A drain is designed at the bottom of the filter for direct discharge. The high-concentration TEAL-containing hydrocarbon oil catches fire when encountering air, and there is a fire risk in direct discharge. In addition, part of the hydrocarbon oil volatilizes during the discharge process, causing environmental pollution. Summary of the Utility Model

[0003] In view of the above problems, the purpose of this application is to provide an improved structure for reducing TEAL hydrocarbon oil at the inlet of a propylene gas recycle compressor, which can realize adding a process to send the hydrocarbon oil at the bottom of the inlet filter to the waste oil treatment tank without adding any new equipment, avoiding direct contact between the hydrocarbon oil and air, and avoiding environmental pollution caused by hydrocarbon oil volatilization.

[0004] To achieve some or all of the above - mentioned purposes or other purposes, the present application provides the following technical solutions: An improved structure for reducing TEAL hydrocarbon oil at the inlet of a propylene gas recycle compressor, including a low - pressure propylene scrubbing tower, a compressor separation tank, a first inlet filter, a second inlet filter, a propylene gas recycle compressor, a feed pump, a TEAL - containing waste oil collection tank, and a reflux pump; The upper outlet pipeline of the low - pressure propylene scrubbing tower is connected to the inlet pipeline of the compressor separation tank; The top outlet pipeline of the compressor separation tank is connected to the inlet pipeline of the first inlet filter, and the top outlet pipeline of the compressor separation tank is connected to the inlet pipeline of the second inlet filter. The bottom outlet pipeline of the compressor separation tank is connected to the inlet pipeline of the feed pump; The upper outlet pipeline of the first inlet filter is connected to the inlet pipeline of the propylene gas recycle compressor, and the upper outlet pipeline of the second inlet filter is connected to the inlet pipeline of the propylene gas recycle compressor; The bottom outlet pipeline of the propylene gas recycle compressor is connected to the bottom outlet pipeline of the compressor separation tank; The outlet pipeline of the feed pump is connected to the oil - draining pipeline of the low - pressure propylene scrubbing tower, and the outlet pipeline of the feed pump is connected to the top inlet pipeline of the TEAL - containing waste oil collection tank; The bottom outlet pipeline of the low - pressure propylene scrubbing tower is connected to the inlet pipeline of the feed pump, and the bottom outlet pipeline of the low - pressure propylene scrubbing tower is also connected to the inlet pipeline of the reflux pump. The outlet pipeline of the reflux pump is connected to the washing liquid reflux pipeline of the low - pressure propylene scrubbing tower; The bottom outlet pipeline of the first inlet filter is connected to the inlet pipeline of the feed pump, and the bottom outlet pipeline of the second inlet filter is connected to the inlet pipeline of the feed pump.

[0005] Further, a first regulating valve is provided on the bottom outlet pipeline of the first inlet filter, and a second regulating valve is provided on the bottom outlet pipeline of the second inlet filter; The bottom outlet pipelines of the first inlet filter and the second inlet filter are connected to the inlet pipeline of the feed pump through a total bottom pipeline, and a third regulating valve is provided on the total bottom pipeline; A fourth regulating valve is provided on the oil - draining pipeline, and a fifth regulating valve is provided on the top inlet pipeline of the TEAL - containing waste oil collection tank.

[0006] Further, a low - pressure discharge device is further included. The top outlet pipeline of the first inlet filter is connected to the inlet pipeline of the low - pressure discharge device, and the top outlet pipeline of the second inlet filter is connected to the inlet pipeline of the low - pressure discharge device.

[0007] Further, a second low - pressure propylene scrubbing tower is further included. The top outlet pipeline of the propylene gas recycle compressor is connected to the inlet pipeline of the second low - pressure propylene scrubbing tower.

[0008] Further, a recycle gas safety filter is further included. The outlet pipeline of the recycle gas safety filter is connected to the propylene recycle gas pipeline of the low - pressure propylene scrubbing tower.

[0009] Compared with the prior art, the beneficial effects of the present utility model are as follows: A pipeline is connected from the bottom drain of the inlet filter of the propylene gas recycle compressor to the inlet drain of the feed pump. When hydrocarbon oil containing TEAL appears at the bottom of the inlet filter of the propylene gas recycle compressor, open the valve at the bottom of the filter and the inlet valve of the feed pump. The outlet flow of the feed pump is redirected to the waste oil treatment tank. Start the feed pump to send the hydrocarbon oil containing TEAL at the bottom of the inlet filter to the waste oil treatment tank. Add antistatic agent to the waste oil treatment tank in batches. After it completely reacts and neutralizes with TEAL in the hydrocarbon oil, put the treated waste oil into empty barrels. This avoids the direct contact of high-concentration hydrocarbon oil containing TEAL with air during direct discharge, avoids direct contact with the human body during on-site discharge and causes personal injury, avoids environmental pollution caused by the volatilization of hydrocarbon oil during on-site discharge, and avoids environmental pollution caused by the spillage of hydrocarbon oil to the ground during on-site discharge. Description of the Drawings

[0010] Figure 1 It is a schematic flow diagram of the present utility model;

[0011] In the figure: 1, low-pressure propylene washing tower; 2, compressor separation tank; 3, first inlet filter; 4, second inlet filter; 5, propylene gas recycle compressor; 6, feed pump; 7, waste oil collection tank containing TEAL; 8, reflux pump; 9, low-pressure discharge device; 10, second low-pressure propylene washing tower; 11, recycle gas safety filter; 12: oil draining pipeline; 13: washing liquid reflux pipeline; 14: propylene recycle gas pipeline. Detailed Embodiments

[0012] In order to make the structure and function of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0013] See the appendix Figure 1, An improved structure for reducing TEAL hydrocarbon oil at the inlet of a propylene gas recycle compressor, comprising a low-pressure propylene scrubbing tower 1, a compressor separation tank 2, a first inlet filter 3, a second inlet filter 4, a propylene gas recycle compressor 5, a feed pump 6, a TEAL-containing waste oil collection tank 7, and a reflux pump 8; the upper outlet pipeline of the low-pressure propylene scrubbing tower 1 is connected to the inlet pipeline of the compressor separation tank 2; the top outlet pipeline of the compressor separation tank 2 is connected to the inlet pipeline of the first inlet filter 3, the top outlet pipeline of the compressor separation tank 2 is connected to the inlet pipeline of the second inlet filter 4, and the bottom outlet pipeline of the compressor separation tank 2 is connected to the inlet pipeline of the feed pump 6; the upper outlet pipeline of the first inlet filter 3 is connected to the inlet pipeline of the propylene gas recycle compressor 5, and the upper outlet pipeline of the second inlet filter 4 is connected to the inlet pipeline of the propylene gas recycle compressor 5; the bottom outlet pipeline of the propylene gas recycle compressor 5 is connected to the bottom outlet pipeline of the compressor separation tank 2; the outlet pipeline of the feed pump 6 is connected to the oil drainage pipeline 12 of the low-pressure propylene scrubbing tower 1, and the outlet pipeline of the feed pump 6 is connected to the top inlet pipeline of the TEAL-containing waste oil collection tank 7; the bottom outlet pipeline of the low-pressure propylene scrubbing tower 1 is connected to the inlet pipeline of the feed pump 6, and the bottom outlet pipeline of the low-pressure propylene scrubbing tower 1 is also connected to the inlet pipeline of the reflux pump 8, and the outlet pipeline of the reflux pump 8 is connected to the washing liquid reflux pipeline 13 of the low-pressure propylene scrubbing tower 1; the bottom outlet pipeline of the first inlet filter 3 is connected to the inlet pipeline of the feed pump 6, and the bottom outlet pipeline of the second inlet filter 4 is connected to the inlet pipeline of the feed pump 6.

[0014] Further, a first regulating valve is provided on the bottom outlet pipeline of the first inlet filter 3, and a second regulating valve is provided on the bottom outlet pipeline of the second inlet filter 4; the bottom outlet pipelines of the first inlet filter 3 and the second inlet filter 4 are connected to the inlet pipeline of the feed pump 6 through a total bottom pipeline, and a third regulating valve is provided on the total bottom pipeline; a fourth regulating valve is provided on the oil drainage pipeline 12, and a fifth regulating valve is provided on the top inlet pipeline of the TEAL-containing waste oil collection tank 7.

[0015] Further, it further includes a low-pressure discharge device 9, the top outlet pipeline of the first inlet filter 3 is connected to the inlet pipeline of the low-pressure discharge device 9, and the top outlet pipeline of the second inlet filter 4 is connected to the inlet pipeline of the low-pressure discharge device 9.

[0016] Further, it further includes a second low-pressure propylene scrubbing tower 10, and the top outlet pipeline of the propylene gas recycle compressor 5 is connected to the inlet pipeline of the second low-pressure propylene scrubbing tower 10.

[0017] Further, it further includes a recycle gas safety filter 11, and an outlet pipeline of the recycle gas safety filter 11 is connected to a propylene recycle gas pipeline 14 of the low-pressure propylene scrubbing tower 1.

[0018] Further, at the bottom drains of the first inlet filter 3 and the second inlet filter 4 of the propylene gas recycle compressor 5, pipelines are connected to the inlet drain of the feed pump 6. When TEAL-containing hydrocarbon oil appears at the bottoms of the first inlet filter 3 and the second inlet filter 4 of the propylene gas recycle compressor 5, the fourth regulating valve is closed, and the first regulating valve, the second regulating valve, the third regulating valve, and the fifth regulating valve are opened. The outlet flow of the feed pump 6 is changed to lead to the TEAL-containing waste oil collection tank 7. The feed pump 6 is started to send the TEAL-containing hydrocarbon oil at the bottoms of the first inlet filter 3 and the second inlet filter 4 to the TEAL-containing waste oil collection tank 7. Antistatic agent is added to the TEAL-containing waste oil collection tank 7 in batches to completely react and neutralize with TEAL in the hydrocarbon oil, and then the treated waste oil is put into empty barrels.

[0019] What is disclosed above is only the preferred embodiment of the present application. Of course, the scope of the rights of the present application cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. An improved structure for reducing TEAL hydrocarbon oil at the inlet of a propylene gas recycle compressor, characterized in that: It includes a low-pressure propylene washing tower (1), a compressor separation tank (2), a first inlet filter (3), a second inlet filter (4), a propylene gas circulation compressor (5), a feed pump (6), a TEAL-containing waste oil collection tank (7), and a reflux pump (8); the upper outlet pipeline of the low-pressure propylene washing tower (1) is connected to the inlet pipeline of the compressor separation tank (2); the top outlet pipeline of the compressor separation tank (2) is connected to the inlet pipeline of the first inlet filter (3), the top outlet pipeline of the compressor separation tank (2) is connected to the inlet pipeline of the second inlet filter (4), and the bottom outlet pipeline of the compressor separation tank (2) is connected to the inlet pipeline of the feed pump (6); the upper outlet pipeline of the first inlet filter (3) is connected to the inlet pipeline of the propylene gas circulation compressor (5), and the upper outlet pipeline of the second inlet filter (4) is connected to the inlet pipeline of the propylene gas circulation compressor (5); the bottom outlet pipeline of the propylene gas circulation compressor (5) is connected to the bottom outlet pipeline of the compressor separation tank (2); the outlet pipeline of the feed pump (6) is connected to the oil draining pipeline (12) of the low-pressure propylene washing tower (1), and the outlet pipeline of the feed pump (6) is connected to the top inlet pipeline of the TEAL-containing waste oil collection tank (7); the bottom outlet pipeline of the low-pressure propylene washing tower (1) is connected to the inlet pipeline of the feed pump (6), and the bottom outlet pipeline of the low-pressure propylene washing tower (1) is also connected to the inlet pipeline of the reflux pump (8), and the outlet pipeline of the reflux pump (8) is connected to the washing liquid reflux pipeline (13) of the low-pressure propylene washing tower (1); the bottom outlet pipeline of the first inlet filter (3) is connected to the inlet pipeline of the feed pump (6), and the bottom outlet pipeline of the second inlet filter (4) is connected to the inlet pipeline of the feed pump (6).

2. The improved structure for reducing TEAL hydrocarbon oil at the inlet of the propylene gas recycle compressor according to claim 1, wherein: A first regulating valve is provided on the bottom outlet pipeline of the first inlet filter (3), and a second regulating valve is provided on the bottom outlet pipeline of the second inlet filter (4); the bottom outlet pipelines of the first inlet filter (3) and the second inlet filter (4) are connected to the inlet pipeline of the feed pump (6) through a total bottom pipeline, and a third regulating valve is provided on the total bottom pipeline; a fourth regulating valve is provided on the oil draining pipeline (12), and a fifth regulating valve is provided on the top inlet pipeline of the TEAL-containing waste oil collection tank (7).

3. An improved structure for reducing TEAL hydrocarbon oil at the inlet of a propylene gas recycle compressor according to claim 1, characterized in that: It also includes a low-pressure discharge device (9), and the top outlet pipeline of the first inlet filter (3) is connected to the inlet pipeline of the low-pressure discharge device (9), and the top outlet pipeline of the second inlet filter (4) is connected to the inlet pipeline of the low-pressure discharge device (9).

4. The improved structure for reducing TEAL hydrocarbon oil at the inlet of the propylene gas recycle compressor according to claim 1, characterized in that: It also includes a second low-pressure propylene washing tower (10), and the top outlet pipeline of the propylene gas circulation compressor (5) is connected to the inlet pipeline of the second low-pressure propylene washing tower (10).

5. The improved structure for reducing TEAL hydrocarbon oil at the inlet of the propylene gas recycle compressor according to claim 1, characterized in that: It also includes a circulating gas safety filter (11), and the outlet pipeline of the circulating gas safety filter (11) is connected to the propylene circulation pipeline (14) of the low-pressure propylene washing tower (1).

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