Dry gas seal recovery equipment for recycle gas compressor of ethylene oxide device
By designing ethylene film recovery equipment in an ethylene oxide device, recycling hydrocarbon components such as ethylene into the process circulation gas, the problem of low recovery rates of nitrogen and other gases in the dry gas sealing system is solved, and energy costs are reduced. Improves the low-energy operation capability of the device.
Patent Information
- Application Number
- CN202421215953.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-30
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-05-30
AI Technical Summary
In the ethylene oxide device, the dry air sealing system contains a large amount of nitrogen and other gases to be recovered into the process circulation gas, and the recovery rate of ethylene and other hydrocarbon substances in some dry air sealing gas is low, resulting in nitrogen in the process gas and The content of other gases increases, and the replacement amount of circulating air pressure is required, resulting in an increase in energy costs.
A dry air seal recycling equipment for ethylene oxide device circulating gas compressor is designed. The ethylene film is recycled and connected to the circulating gas through equipment such as carbon dioxide analysis tower and reboiler. The components are monitored in real time using an online analyzer. , ensure that the recovered hydrocarbon components such as ethylene enter the process recycling gas.
Through the use of ethylene film recycling equipment, the energy cost of the ethylene oxide device is reduced, the content of nitrogen and other gases in the process circulation gas is reduced, and the low-energy operation capability of the device is improved.
Smart Images
Figure CN222427546U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of chemical production equipment, in particular to dry gas sealing recovery equipment for a circulating gas compressor of an ethylene oxide device. Background Art
[0002] In the ethylene oxide unit, the dry gas seal recovery equipment of the ethylene oxide unit circulating gas compressor is a common equipment. As one of the three major systems of the circulating gas compressor, the dry gas seal of the circulating gas compressor ensures that the process gas leaks into the bearings and the atmosphere to ensure the safety and smooth operation of the unit.
[0003] At present, a large amount of nitrogen and other gases are recycled into the process circulating gas in the dry gas sealing system, and the recovery rate of hydrocarbons such as ethylene in some dry gas sealing gases is low. This will lead to an increase in the content of nitrogen and other gases in the process gas, requiring an increase in the replacement amount of the circulating gas pressure, resulting in an increase in energy costs.
[0004] The applicant has found through research that through certain technical improvements, this gas can be separated and recycled for utilization, thereby reducing the energy cost of the device and allowing the device to operate with low energy consumption. Utility Model Content
[0005] In order to solve the above technical problems, this design provides a dry gas seal recovery equipment for the circulating gas compressor of an ethylene oxide unit. The technical solution adopted is as follows:
[0006] A dry gas sealing recovery device for a circulating gas compressor of an ethylene oxide device comprises a carbon dioxide analysis tower and a reboiler, wherein the reboiler is connected to the lower part of the carbon dioxide analysis tower through a pipeline, the reboiler is connected to steam through a pipeline, a flow meter a and a regulating valve a are arranged on the corresponding pipeline, the flow meter a and the regulating valve a are used to control the flow, the reboiler is connected to a condensate pipe network through a pipeline, and a filler is arranged inside the carbon dioxide analysis tower.
[0007] The TEG refining tower, the DEG refining tower, the MEG circulating tower, the MEG refining tower, the ethylene glycol discharge flash tower and the ethylene glycol dehydration tower are connected to the gate valve a through a pipeline, the gate valve a is connected to the vacuum ejector a through a pipeline, and the vacuum ejector a is connected to the RTO combustion system through a pipeline.
[0008] The carbon dioxide decomposition tower is connected to the RTO combustion system through a pipeline, and a thermometer and a gate valve d are provided on the corresponding pipeline. The thermometer is used to monitor the temperature in real time, and the gate valve d is used to control the opening and closing of the pipeline. The steam is connected to the carbon dioxide decomposition tower through a pipeline, and a flow meter b, a regulating valve b and a vacuum ejector b are provided on the corresponding pipeline. Since the above structures belong to the prior art, the applicant will not repeat them here.
[0009] The core improvements of this utility model are as follows:
[0010] The steam turbine is connected to the circulating gas compressor, the circulating gas compressor is connected to the circulating gas compressor dry gas seal, the circulating gas compressor dry gas seal is connected to the ethylene film recovery through the pipeline, and a regulating valve c and a flow meter e are provided on the corresponding pipeline. The lower part of the ethylene film recovery is connected to the RTO combustion system through the pipeline, and a gate valve b is provided on the corresponding pipeline. The middle of the ethylene film recovery is connected to the circulating gas through the pipeline, and an online analyzer and a gate valve c are provided on the corresponding pipeline. The oil and gas recovery is connected to the RTO combustion system through the pipeline, and a regulating valve d and a flow meter c are provided on the corresponding pipeline. The flow meter c and the regulating valve d are used to control the flow. Butadiene is connected to the RTO combustion system through the pipeline, and a regulating valve e and a flow meter d are provided on the corresponding pipeline. The regulating valve e and the flow meter d are used to control the flow.
[0011] Preferably: in order to reduce construction area, steam usage, operating temperature, equipment and operating costs, etc., the ethylene glycol dehydration tower, ethylene glycol discharge flash tower, MEG refining tower, MEG circulation tower, DEG refining tower, and TEG refining tower are designed as vacuum towers.
[0012] Preferably: in order to ensure the reduction of energy costs of the ethylene oxide plant, reduce the replacement of nitrogen in the process circulating gas, and stabilize product quality, online component analysis and real-time monitoring are provided on the relationship between the ethylene membrane recovery and the process circulating gas, and an online analyzer is provided between the ethylene membrane recovery and the circulating gas.
[0013] The beneficial effects of the utility model are as follows: the utility model connects the upper part of the ethylene film recovery to the dry gas seal of the circulating gas compressor through a pipeline, connects the lower part to the RTO combustion system through a pipeline, and connects the side part to the circulating gas through a pipeline. The ethylene film recovery mainly continuously recovers ethylene and other hydrocarbon components in the circulating gas compressor to reduce the energy cost of the ethylene oxide device. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a structural schematic diagram of the utility model.
[0015] In the figure: 1-flow meter b, 2-vacuum ejector b, 3-regulating valve b, 4-flow meter a, 5-flow regulating valve, 6-reboiler, 7-circulating gas compressor, 8-steam turbine, 9-carbon dioxide analysis tower, 10-filler, 11-thermometer, 12-ethylene film recovery, 13-online analyzer, 14-TEG refining tower, 15-DEG refining tower, 16-MEG circulating tower, 17-MEG refining tower, 18-ethylene glycol discharge flash tower, 19-ethylene glycol dehydration tower, 20-vacuum ejector a, 21-regulating valve d, 22-flow meter c, 23-regulating valve e, 24 flow meter d, 25-gate valve a, 26-circulating gas compressor dry gas seal, 27-flow meter e, 28-regulating valve c, 29-gate valve b, 30-gate valve c, 31-gate valve d. DETAILED DESCRIPTION
[0016] Example 1
[0017] like Figure 1 As shown:
[0018] A dry gas sealing recovery device for a circulating gas compressor of an ethylene oxide device comprises a carbon dioxide analysis tower 9 and a reboiler 6, wherein the reboiler 6 is connected to the lower part of the carbon dioxide analysis tower 9 through a pipeline, the reboiler 6 is connected to steam through a pipeline, a flow meter a4 and a regulating valve a5 are arranged on the corresponding pipeline, the reboiler 6 is connected to a condensate pipe network through a pipeline, a packing 10 is arranged inside the carbon dioxide analysis tower 9, a TEG refining tower 14, a DEG refining tower 15, a MEG circulating tower 16, a MEG refining tower 17, an ethylene glycol discharge flash tower 18 and an ethylene glycol dehydration tower 19 are connected to a gate valve a25 through a pipeline, the gate valve a25 is connected to a vacuum ejector a20 through a pipeline, and the vacuum ejector a20 is connected to an RTO combustion system through a pipeline;
[0019] The carbon dioxide analysis tower 9 is connected to the RTO combustion system through a pipeline, and a thermometer 11 and a gate valve d31 are provided on the corresponding pipeline;
[0020] The steam is connected to the carbon dioxide analysis tower 9 through a pipeline, and a flow meter b1, a regulating valve b3 and a vacuum ejector b2 are provided on the corresponding pipeline.
[0021] The steam turbine 8 is connected to the circulating gas compressor 7, the circulating gas compressor 7 is connected to the circulating gas compressor dry gas seal 26, the circulating gas compressor dry gas seal 26 is connected to the ethylene film recovery 12 through the pipeline, and the corresponding pipeline is provided with a regulating valve c28 and a flow meter e27, the lower part of the ethylene film recovery 12 is connected to the RTO combustion system through the pipeline, and the corresponding pipeline is provided with a gate valve b29, the middle of the ethylene film recovery 12 is connected to the circulating gas through the pipeline, and the corresponding pipeline is provided with an online analyzer 13 and a gate valve c30;
[0022] The oil and gas recovery is connected to the RTO combustion system through a pipeline, and a regulating valve d21 and a flow meter c22 are provided on the corresponding pipeline.
[0023] Butadiene is connected to the RTO combustion system through a pipeline, and a regulating valve e23 and a flow meter d24 are provided on the corresponding pipeline.
[0024] The vacuum ejector a20 is an independent vacuum ejection system, and the ethylene glycol dehydration tower 19, the ethylene glycol discharge flash tower 18, the MEG refining tower 17, the MEG circulation tower 16, the DEG refining tower 15, and the TEG refining tower 14 are designed for negative pressure.
[0025] The heat source of the carbon dioxide analysis tower 9 is provided by the 0.5Mpa steam of the carbon dioxide reboiler 6 to ensure that the top temperature of the carbon dioxide analysis tower 9 is controlled at about 100 to 105 degrees;
[0026] The vacuum ejector b20 is compact in structure, easy to install and not easy to scale. It uses 0.5Mpa steam to independently vacuum eject TEG refining tower 14, DEG refining tower 15, MEG circulation tower 16, MEG refining tower 17, ethylene glycol discharge flash tower 18 and ethylene glycol dehydration tower 19, and part of the alcohol-containing gas enters the RTO combustion system;
[0027] The left part of the circulating gas compressor 7 is connected to the circulating gas dry gas seal 26. The right part of the circulating gas dry gas seal 26d is the power source turbine 8 of the circulating gas compressor, which maintains a high speed through ultra-high pressure steam 10.5Mpa. After part of the steam is extracted, the temperature and pressure are reduced and merged into the downstream 2.5Mpa steam network for use. The sealing gas of the circulating gas compressor dry gas seal 26 enters the ethylene membrane recovery 12. Through the continuous work of the ethylene membrane recovery, ethylene and other hydrocarbon components are recovered into the process circulating gas on the right. There is an online analyzer 13, which can ensure that the components entering the process circulating gas are qualified at any time. When the components are unqualified, the gate valve c30 is used to close all of them and enter the RTO combustion system. The ethylene membrane recovery 12 cannot recover them and goes directly to the RTO combustion system.
Claims
1. A dry gas sealing recovery device for a circulating gas compressor of an ethylene oxide device, comprising a carbon dioxide analysis tower (9) and a reboiler (6), wherein the reboiler (6) is connected to the lower part of the carbon dioxide analysis tower (9) through a pipeline, the reboiler (6) is connected to steam through a pipeline, a flow meter a (4) and a regulating valve a (5) are provided on the corresponding pipelines, the reboiler (6) is connected to a condensate pipe network through a pipeline, a packing (10) is provided inside the carbon dioxide analysis tower (9), a TEG refining tower (14), a DEG refining tower (15), a MEG circulating tower (16), a MEG refining tower (17), an ethylene glycol discharge flash tower (18) and an ethylene glycol dehydration tower (19) are connected to a gate valve a (25) through a pipeline, the gate valve a (25) is connected to a vacuum ejector a (20) through a pipeline, and the vacuum ejector a (20) is connected to an RTO combustion system through a pipeline; The carbon dioxide analysis tower (9) is connected to the RTO combustion system through a pipeline, and a thermometer (11) and a gate valve d (31) are provided on the corresponding pipeline; The steam is connected to the carbon dioxide analysis tower (9) through a pipeline, and a flow meter b (1), a regulating valve b (3) and a vacuum ejector b (2) are provided on the corresponding pipeline, characterized in that: The steam turbine (8) is connected to the circulating gas compressor (7), the circulating gas compressor (7) is connected to the circulating gas compressor dry gas seal (26), the circulating gas compressor dry gas seal (26) is connected to the ethylene film recovery (12) through the pipeline, and a regulating valve c (28) and a flow meter e (27) are provided on the corresponding pipeline. The lower part of the ethylene film recovery (12) is connected to the RTO combustion system through the pipeline, and a gate valve b (29) is provided on the corresponding pipeline. The middle of the ethylene film recovery (12) is connected to the circulating gas through the pipeline, and a gate valve c (30) is provided on the corresponding pipeline.
2. The dry gas seal recovery equipment for the circulating gas compressor of an ethylene oxide device according to claim 1, characterized in that: The oil and gas recovery is connected to the RTO combustion system through a pipeline, and a regulating valve d (21) and a flow meter c (22) are provided on the corresponding pipeline.
3. The dry gas seal recovery equipment for the circulating gas compressor of an ethylene oxide device according to claim 1, characterized in that: Butadiene is connected to the RTO combustion system through a pipeline, and a regulating valve e (23) and a flow meter d (24) are provided on the corresponding pipeline.
4. The dry gas seal recovery equipment for the circulating gas compressor of an ethylene oxide device as claimed in claim 1, characterized in that: The vacuum ejector a (20) is an independent vacuum ejection system, and the ethylene glycol dehydration tower (19), the ethylene glycol discharge flash tower (18), the MEG refining tower (17), the MEG circulation tower (16), the DEG refining tower (15), and the TEG refining tower (14) are designed for negative pressure.
5. The dry gas seal recovery equipment for the circulating gas compressor of an ethylene oxide device as claimed in claim 1, characterized in that: An online analyzer (13) is provided between the ethylene film recovery (12) and the circulating gas.