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Method for reducing coking materials of ethylene cracking furnace

A technology of ethylene cracking furnace and coke, which is applied in cracking, non-catalytic thermal cracking, petroleum industry, etc. It can solve the problem of unable to remove the high polymer entrained by dilution steam, and achieve the effect of avoiding coking and good technical effect

Active Publication Date: 2018-01-19
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem in the prior art that the high polymer entrained by the dilution steam cannot be removed, the present invention provides a method for reducing the coke in the ethylene cracking furnace

Method used

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  • Method for reducing coking materials of ethylene cracking furnace

Examples

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Comparison scheme
Effect test

Embodiment 1

[0024] In the invention, a process water extraction and rectification tower is added after the process water in the process water stripping tower is discharged, and trace high polymers in the process water are removed by an extraction and rectification method.

[0025] The production scale of the ethylene plant is 115,000 tons / year, and the process water treatment capacity entering the process water extractive distillation tower is 28.0 tons / hour. When the gas phase velocity of the process water extractive distillation tower is 0.10 cm / s and the dispersed phase velocity is 0.50 cm / s, the gas holdup is 0.04% and the liquid holdup is 0.25%; the process water extractive distillation tower is packed with bulk packing. The operating temperature of the tower is 70°C at the top of the tower, 110°C at the bottom of the tower, 0.15MPa at the operating pressure (absolute pressure), 140°C at the steam operating temperature, 0.20MPa at the operating pressure (absolute pressure), and the ex...

Embodiment 2

[0027]Same as Example 1, only the operating conditions of the process water extractive distillation column are changed. When the gas phase velocity of the process water extractive distillation tower is 0.05 cm / s and the dispersed phase velocity is 0.30 cm / s, the gas holdup is 0.02% and the liquid holdup is 0.15%; the process water extractive distillation tower is packed with bulk packing. The high polymer contained in the process water entering the process water extractive distillation tower is 50.0mg / L, and after extraction and rectification separation, the high polymer contained in the process water flowing out of the process water extractive distillation tower is only 0.4mg / L, thus During the 3-5 year normal operation period of the entire ethylene unit, coking did not occur in the convection section of the cracking furnace, and the operation period of the cracking furnace was extended to 90 days.

Embodiment 3

[0029] Same as Example 2, only the operating conditions of the process water extractive distillation tower are changed. When the gas phase velocity of the process water extractive distillation tower is 0.20 cm / s and the dispersed phase velocity is 0.80 cm / s, the gas holdup is 0.05% and the liquid holdup is 0.35%; the process water extractive distillation tower is packed with bulk packing. The high polymer contained in the process water entering the process water extractive distillation tower is 50.0mg / L, and after extraction and rectification separation, the high polymer contained in the process water flowing out of the process water extractive distillation tower is only 0.4mg / L, thus During the 3-5 year normal operation period of the entire ethylene unit, coking did not occur in the convection section of the cracking furnace, and the operation period of the cracking furnace was extended to 90 days.

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Abstract

The invention discloses a method for reducing coking materials of an ethylene cracking furnace, and mainly solves the problem that high polymers entrained by dilution steam cannot be removed in the prior art. In the method provided by the invention, quenching is performed on cracking gas generated by the ethylene cracking furnace; oil washing is performed; then obtained cracking gas enters a waterwashing tower; process water in the kettle of the water washing tower enters a process-water stripping tower; and the water in the process-water stripping tower enters a process-water extraction rectifying tower, and is in full contact with an extraction agent and water vapor for ''gas phase-oil phase-water phase'' three-phase mass transfer, wherein when the gas-phase speed in the process-water extraction rectifying tower is 0.05-0.20 cm / s and the dispersion phase speed is 0.30-0.80 cm / s, a technical scheme with a gas holdup in a range of 0.02-0.05% and a liquid holdup in a range of 0.15-0.35% solves the problem well, and can be used for the convection section and radiation section of the cracking furnace.

Description

technical field [0001] The invention relates to a method for reducing coke in an ethylene cracking furnace. Background technique [0002] In the process of producing ethylene with petroleum hydrocarbons as cracking raw materials, steam thermal cracking technology is usually used to enter the cracking furnace in a certain proportion between diluted steam and cracking raw materials to reduce the partial pressure of hydrocarbons, thereby increasing the yield of ethylene products. After the cracking chemical reaction, the cracked gas and dilution steam enter the quenching oil tower and the quenching water tower successively, and the dilution steam is condensed into process water in the quenching water tower. The process water contains trace amounts of styrene polymers, diene polymers, and cycloolefin polymers. , fused ring olefin polymers and other trace polymers. The process water flowing out of the quench water tower tank is stripped by the process water stripping tower, and ...

Claims

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Application Information

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IPC IPC(8): C10G9/16
Inventor 吴德荣何琨李真泽徐尔玲
Owner SINOPEC SHANGHAI ENG
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