Exhaust recovery system of compressor

Abstract

The utility model discloses a compressor exhaust gas recovery system which is used in a tail gas recovery operation scene of a degassing system of a polyethylene device, and a first-stage gas inlet tank, a first-stage exhaust tank, a second-stage gas inlet tank and a second-stage exhaust tank are sequentially communicated with the tail section of the degassing system; the two ends of the first-stage return line fixedly communicate with an air inlet of the first-stage air inlet tank and an air outlet of the first-stage exhaust tank correspondingly, and the compressor body communicates with the first-stage air inlet tank, the first-stage exhaust tank, the second-stage air inlet tank and the second-stage exhaust tank correspondingly. According to the application, the primary return line is communicated with the gas inlet of the primary gas inlet tank and the gas outlet of the primary exhaust tank, so that tail gas subjected to primary exhaust operation flows back to the gas inlet of the primary gas inlet tank again, and the exhaust temperature of the compressor between the secondary gas inlet tank and the secondary exhaust tank is at a low temperature level; the exhaust temperature of the compressor is reduced, so that the working load of the compressor is enhanced.

Description

Technical Field

[0001] The present application relates to the technical field of tail gas recovery, and in particular to a compressor exhaust gas recovery system. Background Art

[0002] The exhaust gas from the degassing system of the polyethylene unit is discharged to the tail gas recovery unit. The recovered liquid is compressed and cooled by the tail gas recovery compressor and then re-injected into the reactor to improve the monomer utilization rate.

[0003] During the production of high-density products, due to the low concentration of heavy hydrocarbon components in the reactor, the concentration of heavy hydrocarbons entering the tail gas recovery compressor is also low, resulting in a period of exhaust temperature being too high during the operation of the compressor to load, and a portion of the exhaust gas is directly discharged into the flare system, reducing the recovery efficiency, which not only causes waste of raw materials, but also causes certain pollution to the environment. Utility Model Content

[0004] The embodiment of the present application provides a compressor exhaust recovery system, aiming to improve the exhaust gas recovery rate while reducing the unit consumption of the product.

[0005] To achieve the above objectives, the present application embodiment adopts the following technical solutions:

[0006] A compressor exhaust recovery system is used in the tail gas recovery operation scenario of the degassing system of a polyethylene device, comprising a first-level air inlet tank, a first-level exhaust tank, a second-level air inlet tank, a second-level exhaust tank, a first-level reflux line, a compressor body, and a generator body; the first-level air inlet tank, the first-level exhaust tank, the second-level air inlet tank, and the second-level exhaust tank are sequentially connected to the tail section of the degassing system; the two ends of the first-level reflux line are respectively fixedly connected to the air inlet of the first-level air inlet tank and the air outlet of the first-level exhaust tank, and the compressor body is respectively connected to the first-level air inlet tank, the first-level exhaust tank, the second-level air inlet tank, and the second-level exhaust tank.

[0007] Furthermore, a first-level reflux valve is fixedly arranged on the reflux path of the first-level reflux line, and the first-level reflux valve is connected to the first-level reflux line, so as to limit the pressure at the air inlet end of the first-level air inlet tank and the air outlet end of the first-level exhaust tank.

[0008] Furthermore, it also includes a secondary return line, and both ends of the secondary return line are respectively connected to the air inlet end of the primary air inlet tank and the air outlet end of the secondary exhaust tank.

[0009] Furthermore, a secondary reflux valve is fixed on the reflux path of the secondary reflux line, and the secondary reflux valve is connected to the secondary reflux line, which can limit the pressure at the air inlet end of the primary air inlet tank and the air outlet end of the secondary exhaust tank.

[0010] Furthermore, the compressor body includes a first generator and a second generator; the first generator is fixedly arranged on the top of the compressor body, and is connected with the outlet end of the first-stage air inlet tank and the air inlet end of the first-stage exhaust tank; the second generator is fixedly arranged on the top of the compressor body, and is spaced apart from the first generator, and the second generator is respectively connected with the outlet end of the second-stage air inlet tank and the air inlet end of the second-stage exhaust tank.

[0011] One or more technical solutions provided in the embodiments of the present utility model have at least the following technical effects or advantages:

[0012] The embodiment of the utility model is connected to the air inlet of the first-level air inlet tank and the air outlet of the first-level exhaust tank through a primary return line, so that the tail gas after the first-level exhaust operation is returned to the air inlet of the first-level air inlet tank again, so that the tail gas that has completed the first-level treatment is recycled again to reduce the exhaust temperature of the compressor, thereby increasing the workload of the compressor. In addition, the setting of the primary return line can also balance the pressure at the tail end during the secondary exhaust, so that the exhaust temperature of the compressor located between the secondary air inlet tank and the secondary exhaust tank is at a low temperature level, thereby enabling the compressor to load the load to increase the recovery rate of the tail gas in the secondary exhaust. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments of the utility model or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 A schematic diagram of the structure provided for an embodiment of the present application.

[0015] Icons: 10-first-stage air inlet tank; 11-first-stage exhaust tank; 12-first-stage reflux line; 13-first-stage reflux valve; 20-second-stage air inlet tank; 21-second-stage exhaust tank; 22-second-stage reflux line; 23-second-stage reflux valve; 30-compressor body; 31-first generator; 32-second generator. DETAILED DESCRIPTION

[0016] 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 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.

[0017] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. The terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0018] Combination Figure 1 As shown, a compressor exhaust recovery system is used in the tail gas recovery operation scenario of the degassing system of a polyethylene device, comprising a first-level air inlet tank 10, a first-level exhaust tank 11, a second-level air inlet tank 20, a second-level exhaust tank 21, a first-level return line 12, a compressor body 30, and a generator body; a generator is fixedly arranged on the compressor body 30; the first-level air inlet tank 10, the first-level exhaust tank 11, the second-level air inlet tank 20, and the second-level exhaust tank 21 are sequentially connected to the tail section of the degassing system; the two ends of the first-level return line 12 are respectively fixedly connected to the air inlet of the first-level air inlet tank 10 and the air outlet of the first-level exhaust tank 11, and the compressor body 30 is respectively connected to the first-level air inlet tank 10, the first-level exhaust tank 11, the second-level air inlet tank 21, and the second-level exhaust tank 22.

[0019] The compressor in the present application is used for further compression and recovery of the tail exhaust of the polyethylene device degassing system. In the above scheme, the first-level air intake tank 10 and the first-level exhaust tank 11 constitute the first-level exhaust operation, and the second-level air intake tank 20 and the second-level exhaust tank 21 constitute the second-level exhaust operation, which constitutes a double exhaust operation for the polyethylene device degassing system as a whole. The first-level reflux line 12 is connected to the air inlet of the first-level air intake tank 10 and the air outlet of the first-level exhaust tank 11, so that the tail gas after the first-level exhaust operation flows back to the air inlet of the first-level air intake tank 10 again, so that the tail gas that has completed the first-level treatment is recycled again to reduce the exhaust temperature of the compressor, thereby increasing the workload of the compressor. In addition, the setting of the first-level reflux line 12 can also balance the pressure at the tail end during the second-level exhaust, so that the exhaust temperature of the compressor located between the second-level air intake tank 20 and the second-level exhaust tank 21 is at a low temperature level, so that the compressor can be loaded to increase the recovery rate of the tail gas in the second-level exhaust.

[0020] A primary reflux valve 13 is fixedly arranged on the reflux path of the primary reflux line 12 . The primary reflux valve 13 is connected to the primary reflux line 12 and can limit the pressure at the air inlet end of the primary air inlet tank 10 and the air outlet end of the primary exhaust tank 11 .

[0021] In the above scheme, the first-level reflux valve 13 is arranged on the reflux path of the first-level reflux line 12. The staff can control the opening and closing degree of the first-level reflux valve 13 manually or electrically, and return the exhaust gas in the first-level exhaust process to the air inlet of the first-level air inlet tank 10 to perform secondary exhaust gas pressurization recovery, so that the temperature of the secondary recovered exhaust gas is reduced, so as to reduce the working temperature of the compressor located in the first-level exhaust, thereby ensuring that the compressor located in the first-level exhaust is always in a loaded and compliant state, thereby ensuring the normal recovery of the exhaust gas.

[0022] It also includes a secondary reflux line 22, and the two ends of the secondary reflux line 22 are respectively connected to the air inlet end of the primary air inlet tank 10 and the air outlet end of the secondary air exhaust tank 21. The present application also sets a secondary reflux line 22 for the secondary exhaust, and the tail gas generated by the secondary exhaust is refluxed again, and the output end of the secondary reflux line 22 is connected to the input end of the primary air inlet tank 10. That is to say, the tail gas generated by the degassing system will be recycled for the first time by the primary exhaust, recycled for the second time by the backflow of the primary reflux line 12, recycled for the second time by the secondary exhaust, and recycled for the last time by the secondary reflux line 22, and then passed through the atmosphere or ignited to prevent the tail gas from polluting the atmospheric environment.

[0023] A secondary reflux valve 23 is fixed on the reflux path of the secondary reflux line 22. The secondary reflux valve 23 is connected to the secondary reflux line 22 and can limit the pressure at the air inlet end of the primary air inlet tank 10 and the air outlet end of the secondary exhaust tank 21. The secondary reflux valve 23 is arranged on the reflux path of the secondary reflux line 22. The staff can control the opening and closing degree of the secondary reflux valve 23 manually or electrically to recirculate the exhaust gas in the secondary exhaust process to the air inlet of the primary air inlet tank 10, and re-pressurize and recover the exhaust gas, so that the temperature of the recovered exhaust gas is reduced, so as to reduce the working temperature of the compressor located in the secondary exhaust, thereby ensuring that the compressor located in the secondary exhaust is always in a loading compliance state, and ensuring the normal recovery of the exhaust gas.

[0024] The compressor body 30 includes a first generator 31 and a second generator 32; the first generator 31 is fixedly arranged on the top of the compressor body 30, and is connected with the outlet end of the first-stage air inlet tank 10 and the air inlet end of the first-stage exhaust tank 11; the second generator 32 is fixedly arranged on the top of the compressor body 30, and is spaced apart from the first generator 31, and the second generator 32 is respectively connected with the outlet end of the second-stage air inlet tank 20 and the air inlet end of the second-stage exhaust tank 21.

[0025] The compressor body 30 in the present application includes a first generator 31 and a second generator 32. The first generator 31 is used for pressurizing the exhaust gas in the first exhaust process, and the second generator 32 is used for pressurizing the exhaust gas in the second exhaust process. During the exhaust gas pressurization process, the exhaust gas volume is compressed by the first generator 31 and the second generator 32 to increase the concentration of heavy hydrocarbon components in the exhaust gas, and the exhaust gas can also be cooled, thereby ensuring that the compressor can always work under normal load.

[0026] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0027] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A compressor exhaust recovery system, used in the tail gas recovery operation scenario of the degassing system of a polyethylene device, characterized in that: It comprises a first-stage air intake tank (10), a first-stage exhaust tank (11), a second-stage air intake tank (20), a second-stage exhaust tank (21), a first-stage return line (12), and a compressor body (30); The first-stage air intake tank (10), the first-stage air exhaust tank (11), the second-stage air intake tank (20), and the second-stage air exhaust tank (21) are sequentially connected to the tail section of the degassing system; The two ends of the primary return line (12) are respectively fixedly connected to the air inlet of the primary air inlet tank (10) and the air outlet of the primary air exhaust tank (11); The compressor body (30) is respectively connected to the first-stage air intake tank (10), the first-stage air exhaust tank (11), the second-stage air intake tank (20), and the second-stage air exhaust tank (21).

2. The compressor exhaust gas recovery system according to claim 1, characterized in that: A primary return valve (13) is fixedly arranged on the return path of the primary return line (12); the primary return valve (13) is connected to the primary return line (12) and can limit the pressure at the air inlet end of the primary air inlet tank (10) and the air outlet end of the primary air exhaust tank (11).

3. The compressor exhaust gas recovery system according to claim 1, characterized in that: It also includes a secondary return line (22), the two ends of which are respectively connected to the air inlet end of the primary air inlet tank (10) and the air outlet end of the secondary air exhaust tank (21).

4. The compressor exhaust gas recovery system according to claim 3, characterized in that: A secondary return valve (23) is fixed on the return path of the secondary return line (22); the secondary return valve (23) is connected to the secondary return line (22) and can limit the pressure at the air inlet end of the primary air inlet tank (10) and the air outlet end of the secondary air exhaust tank (21).

5. The compressor exhaust gas recovery system according to claim 1, characterized in that: The compressor body (30) comprises a first generator (31) and a second generator (32); The first generator (31) is fixedly arranged on the top of the compressor body (30), and is communicated with the air outlet end of the first-stage air intake tank (10) and the air intake end of the first-stage air exhaust tank (11); The second generator (32) is fixedly arranged on the top of the compressor body (30) and is spaced apart from the first generator (31). The second generator (32) is respectively connected to the outlet end of the secondary air intake tank (20) and the inlet end of the secondary air exhaust tank (21).

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