Method for reducing ethene device energy consumption

An ethylene plant and energy consumption technology, applied in chemical instruments and methods, hydrocarbon purification/separation, hydrocarbons and other directions, can solve the problems of small discharge, increase energy consumption of ethylene plant, loss of function, etc., and reduce the compression work. The effect of improving heat recovery efficiency and reducing energy consumption

Active Publication Date: 2016-05-11
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0012] Due to the inability to effectively discharge the asphaltenes generated in the quenching oil in the existing technology, the temperature of the oil washing tower can only be lowered to control the viscosity of the quenching oil, which greatly increases the energy consumption of the ethylene plant
In particular, in recent years, the cracking raw materials have gradually become lighter. Since the cracked fuel oil produced is very small, that is, the discharge amount is smaller under the same circulation volume, which means that the quenching oil stays in the system for a longer time and produces more asphaltenes. , less can be discharged, making the existing technology basically useless

Method used

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  • Method for reducing ethene device energy consumption

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Embodiment

[0029] An ethylene plant has an annual output of 200kt / a, an annual operation of 8000h, and an ethylene output of 25t / h. The high-temperature cracked gas at the outlet of the cracking furnace (containing H 2to pyrolysis fuel oil, including dilution steam), after the waste heat boiler recovers heat and is cooled, the total amount is 147t / h, enters the quencher, directly contacts with the quenching oil, and cools down. The cooled cracked gas and quenching oil enter the oil washing tower together for oil and gas separation. The temperature of the tower kettle is 200°C. The circulating quenching oil is drawn out from the tower kettle and enters the dilution steam generator to generate 41t / h of dilution steam. The total amount of circulating quenching oil is 1200t / h. After being cooled, the quenching oil is divided into three paths, one path goes to the cracking furnace quencher, one path passes through the process water preheater and then returns to the oil washing tower, and one...

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Abstract

The invention discloses a method for reducing ethene device energy consumption. The method comprises cooling pyrolysis gas from an outlet of a pyrolysis furnace through a quench cooler, feeding the cooled pyrolysis gas into an oil washing tower, carrying out substance separation, discharging quenching oil from the bottom of the oil washing tower, feeding a part of the quenching oil into the quench cooler, returning a part of the quenching oil back to the oil washing tower, feeding a part of the quenching oil into an extraction tower, carrying out solvent-based extraction, returning the material at the top of the extraction tower back to the oil washing tower and discharging an asphalt phase at the bottom of the extraction tower, wherein the solvent used in the extraction tower is pyrolysis gas from an outlet of an ethene device compressor.

Description

technical field [0001] The invention relates to the field of ethylene production, and more specifically, relates to a method for reducing energy consumption of an ethylene device. Background technique [0002] At present, major ethylene plants in the world use steam pyrolysis to produce basic organic chemical raw materials such as ethylene, propylene, butadiene, and aromatics. Raw materials such as light hydrocarbons, naphtha, and hydrogenated tail oil are mixed with a certain proportion of diluted steam in an industrial cracking furnace to undergo cracking reactions under high temperature conditions. Diene and other chemical raw materials. [0003] The quenching system is the throat of the ethylene plant. It is composed of quenching coolers, oil washing towers, water washing towers and other equipment. The key equipment for recovering heat in the center. The cracked gas from the waste heat boiler outlet of the industrial cracking furnace is sent to the bottom of the oil ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/00C07C11/04
Inventor 王国清刘同举杜志国张利军杨晓红郭莹
Owner CHINA PETROLEUM & CHEM CORP
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