Search

CN-121972037-A - Dilution system for recycling purge gas from ethylene film

CN121972037ACN 121972037 ACN121972037 ACN 121972037ACN-121972037-A

Abstract

The invention discloses a diluting system for recovering purge gas from an ethylene film, which belongs to the technical field of chemical production and comprises a pipeline b, a pipeline g and a pipeline e, and is characterized in that a pipeline accessory a and a methane pressure swing adsorption tank are connected to the pipeline b, a pipeline c is connected to the pipeline b in parallel, a pipeline accessory c is connected to the pipeline h, a pipeline g is connected with a pipeline accessory d, a pipeline accessory e is connected to the pipeline b and the pipeline g through a pipeline a, a pipeline accessory f and a pipeline accessory h are connected to the pipeline e through a pipeline d, and a pipeline accessory h is connected to the pipeline e.

Inventors

  • YANG WEIDONG
  • WANG FANG
  • FAN CHANGHAI
  • WANG XU
  • LIU PINGJUN
  • XIONG CHAO
  • ZHANG RUITING

Assignees

  • 连云港石化有限公司

Dates

Publication Date
20260505
Application Date
20260312

Claims (9)

  1. 1. The diluting system for the ethylene membrane recovery purge gas comprises a pipeline b (52), a pipeline g (57) and a pipeline e (55), and is characterized in that a pipeline accessory a and a methane pressure swing adsorption tank (14) are connected to the pipeline b (52), a pipeline c (53) is connected to the pipeline c (53), a pipeline h (58) is connected to the pipeline b (52), a pipeline accessory c is connected to the pipeline h (58), a pipeline g (57) is connected to the pipeline h (58), a pipeline accessory d is connected to the pipeline g (57), a pipeline accessory e is connected to the pipeline b (52) and the pipeline g (57) through a pipeline a (51), a pipeline accessory d (54) is connected to the pipeline h (58), a pipeline accessory f and an ethylene membrane recovery tank (30) are connected to the pipeline e (55), a pipeline accessory g is connected to the pipeline d (54), and a pipeline accessory h is connected to the pipeline b (52) through a pipeline f (56).
  2. 2. A dilution system for recycling off-gas of ethylene film according to claim 1, wherein the pipeline attachment a comprises a gate valve w (50), a blind plate i (49), a gate valve v (48), a gate valve r (47), a gate valve t (44), a blind plate h (45), a gate valve u (46), a sampler (11), a thermometer (12), a pressure gauge b (13) and a flowmeter b (15) connected to the pipeline b (52).
  3. 3. A dilution system for ethylene membrane recovery purge gas according to claim 1, wherein the line attachment b comprises a gate valve e (9) and a blind plate b (10) connected to the line c (53).
  4. 4. A dilution system for a recycled purge gas of an ethylene film according to claim 1, wherein the line attachment c comprises a gate valve f (16), a blind plate c (17), a gate valve g (18), a pressure gauge c (25), a flow meter c (26), a gate valve l (27), a flow control valve (28) and a gate valve m (29) connected to the line h (58).
  5. 5. A dilution system for ethylene membrane recovery purge gas according to claim 1, wherein the line attachment d comprises a gate valve a (1), a blind plate a (2), a flow meter a (3), a gate valve j (22), a blind plate e (23) and a gate valve k (24) connected to the line g (57).
  6. 6. A dilution system for a recycled purge gas of an ethylene film according to claim 1, wherein the line attachment e comprises a gate valve d (8), a pressure gauge a (7), a gate valve c (6), a pressure control valve a (5) and a gate valve b (4) connected to the line a (51).
  7. 7. A dilution system for a recycled purge gas of an ethylene film according to claim 1, wherein the line attachment f comprises a pressure gauge d (31), a gate valve n (32), a pressure control valve b (33), a gate valve o (34), a flow meter d (35), a gate valve p (36), a blind flange f (37), a gate valve q (38), a pressure gauge e (39) and a flow meter e (40) connected to the line e (55).
  8. 8. A dilution system for ethylene membrane recovery purge gas according to claim 1, wherein the line attachment g comprises a gate valve h (19), a blind plate d (20) and a gate valve i (21) connected to the line d (54).
  9. 9. A dilution system for ethylene membrane recovery purge gas according to claim 1, wherein the line attachment h comprises a gate valve r (41), a blind plate g (42) and a gate valve s (43) connected to a line f (56).

Description

Dilution system for recycling purge gas from ethylene film Technical Field The invention relates to the technical field of chemical production, in particular to a dilution system for recycling purge gas from an ethylene film. Background The purge gas of the ethylene film recovery unit of the epoxy device is typical industrial tail gas generated in the production process, the oxygen content is stabilized at 7% -10%, and the combustible component has recovery and utilization values, but the higher oxygen content has strict requirements on the transportation and combustion safety. The original 0.6MPa and 0.8MPa natural gas pipelines are discharged to the 0.4MPa fuel gas pipeline network of the whole plant to serve as fuel gas of a steam boiler, so that purge gas of an ethylene membrane recovery unit is required to be introduced into the 0.6MPa or 0.8MPa natural gas pipeline network for energy recovery, however, in order to optimize production cost and reduce steam price, an enterprise adjusts a production energy strategy to stop running of the own steam boiler, the external steam is purchased to serve as a heat source, so that the gas consumption of the original 0.4MPa fuel gas pipeline network of the whole plant is greatly reduced, the natural gas of 0.6MPa is mixed with desorption gas in a methane pressure swing adsorption tank in the prior art, after the oxygen content in the mixed gas is reduced to a safe range, the mixed gas is diluted with purge gas of an ethylene membrane recovery unit and then is introduced into the 0.4MPa pipeline network to be suitable for users with greatly reduced gas consumption, and when the natural gas pipeline network of 0.8MPa is used in a switching mode, even if the mixed gas with the purge gas of the ethylene membrane recovery unit is diluted and then is introduced into the 0.4MPa pipeline network, and the purge gas pipeline network is difficult to use, and the purge gas of the system cannot be recycled when the purge gas pipeline network of the 0.8MPa is not used, and the system cannot be used when the purge gas pipeline network of the system is used is in a mode. Disclosure of Invention In order to solve the technical problems mentioned in the background art, the invention provides a diluting system for recycling purge gas of an ethylene film, which adopts the following technical scheme: The methane pressure swing adsorption device is characterized in that a pipeline accessory a and a methane pressure swing adsorption tank are connected to the pipeline b, a pipeline c is connected to the pipeline b in parallel, a pipeline accessory b is connected to the pipeline c, a pipeline h is connected to the pipeline b, a pipeline accessory c is connected to the pipeline h, a pipeline g is connected to the pipeline h, a pipeline accessory d is connected to the pipeline g, a pipeline accessory e is connected to the pipeline b and the pipeline g through the pipeline a, a pipeline accessory d is connected to the pipeline h and the pipeline e, a pipeline accessory f and an ethylene membrane recovery tank are connected to the pipeline e, a pipeline accessory g is connected to the pipeline d, a pipeline f is connected to the pipeline e and the pipeline b, and a pipeline accessory h is connected to the pipeline f. Further, the pipeline accessory a comprises a gate valve w, a blind flange i, a gate valve v, a gate valve r, a gate valve t, a blind flange h, a gate valve u, a sampler, a thermometer, a pressure gauge b and a flowmeter b which are connected to the pipeline b. Further, the pipeline accessory b comprises a gate valve e and a blind plate b connected to the pipeline c. Further, the pipeline accessory c comprises a gate valve f, a blind plate c, a gate valve g, a pressure gauge c, a flowmeter c, a gate valve l, a flow control valve and a gate valve m which are connected to the pipeline h. Further, the pipeline accessory d comprises a gate valve a, a blind plate a, a flowmeter a, a gate valve j, a blind plate e and a gate valve k which are connected to the pipeline g. Further, the pipeline accessory e comprises a gate valve d, a pressure gauge a, a gate valve c, a pressure control valve a and a gate valve b which are connected to the pipeline a. Further, the pipeline accessory f comprises a pressure gauge d (31), a gate valve n, a pressure control valve b, a gate valve o, a flow meter d, a gate valve p, a blind plate f, a gate valve q, a pressure gauge e and a flow meter e which are connected to the pipeline e. Further, the pipeline accessory g comprises a gate valve h, a blind plate d and a gate valve i which are connected to the pipeline d. Further, the pipeline accessory h comprises a gate valve r, a blind plate g and a gate valve s connected to the pipeline f. The invention has the advantages that the pipeline b of the 0.6MPa natural gas interface and the pipeline g of the 0.8MPa natural gas interface can be respectively butted with the pipeline f of the inlet of the 0.4MPa natura