A method for reducing energy consumption of ethylene plant

An ethylene plant and energy consumption technology, applied in non-catalytic thermal cracking, hydrocarbon cracking to hydrocarbon production, organic chemistry, etc., can solve the problems of small discharge, inability to discharge asphaltene, loss of function, etc., to increase production and reduce compression energy. energy consumption and solvent consumption, and the effect of reducing overall energy consumption

Active Publication Date: 2018-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
  • Application Information

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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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  • A method for reducing energy consumption of ethylene plant
  • A method for reducing energy consumption of ethylene plant

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Embodiment

[0031] An ethylene plant has an annual output of 200k / 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 2 to 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 quench oil enter the oil washing tower together for oil and gas separation. The circulating quenching oil is drawn from the tank of the oil washing tower and enters the dilution steam generator to generate dilution steam. The total amount of circulating quenching oil is 1200t / h. The cracked gas drawn from the top of the oil washing tower is separated into C2-C5 hydrocarbons through compression and separation system. After the quench oil is cooled, it is divided into three paths, one path goes to the cracking furnace quencher; one path pa...

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Abstract

The invention discloses a method for reducing energy consumption of an ethylene device; the method is characterized in that cracked gas coming out of a cracking furnace outlet is cooled by a quench cooler, then is sent into an oil washing tower and is subjected to substance separation, quench oil is led out from the tower bottom of the oil washing tower, and a part of the quench oil is sent to the quench cooler; a part of the quench oil returns to the oil washing tower; a part of the quench oil enters an extraction tower and is extracted by a solvent, a material at the tower top of the extraction tower returns to the oil washing tower, and an asphalt phase of a material at the tower bottom of the extraction tower is led out.

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 Patents(China)
IPC IPC(8): C10G9/18C07C11/04C07C4/04
Inventor 杜志国王国清刘同举郭莹张永刚周先锋
Owner CHINA PETROLEUM & CHEM CORP
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