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A method for reducing energy consumption of ethylene plant

An ethylene device and energy consumption technology, which is applied in the chemical industry, non-catalytic thermal cracking, climate sustainability, etc., can solve the problems of small discharge, loss of function, and less discharge, and achieve reduction of preheating energy consumption, Effect of reducing energy consumption and improving recycling efficiency

Active Publication Date: 2017-09-29
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0012] In particular, in recent years, the cracking raw materials have gradually become lighter. Since the cracked fuel oil produced is very small, the discharge volume is smaller under the same circulation volume, and the quenching oil stays in the system for a longer time, and more asphaltenes are produced, which can be discharged. Fewer, rendering existing technologies largely useless
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

Method used

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  • A method for reducing energy consumption of ethylene plant
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Embodiment

[0033] 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 (contains components from H2 to cracked fuel oil, and also includes dilution steam), after being cooled by the waste heat boiler, the total amount is 147t / h, and enters the quencher to directly contact with the quenching oil ,cool down. The cooled pyrolysis gas and quenching oil enter the oil washing tower together for oil and gas separation, and the circulating quenching oil is drawn out from the tower kettle and enters the dilution steam generator to generate dilution steam. After the quench oil is cooled, it 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; the other path enters the extraction tower and undergoes solvent extraction, and the asphalt is mainly removed ...

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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, discharging an asphalt phase at the bottom of the extraction tower, reducing pressure of the material at the top of the extraction tower, feeding the material subjected to pressure reduction into a solvent recovery tower, separating the solvent and quenching oil subjected to visbreaking, returning the quenching oil subjected to visbreaking back to the oil washing tower, returning the solvent back to the pyrolysis furnace and carrying out pyrolysis.

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 The cracked gas from the waste heat boiler outlet of the industrial cracking furnace is sent to the bottom of the oil washing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G9/18C07C11/04C07C4/04
CPCY02P20/10Y02P20/50
Inventor 王国清刘同举杜志国郭莹张永刚田勇
Owner CHINA PETROLEUM & CHEM CORP
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