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Method for improving ethylene apparatus quench oil tower bottom temperature

A technology of tower bottom temperature and quenching oil, which is applied in the fields of hydrocarbon cracking, organic chemistry, etc., can solve problems such as poor heat recovery, increased steam consumption, and increased operating costs of the device, achieving huge economic benefits, saving funds, and significantly The effect of social benefits

Active Publication Date: 2008-12-17
PETROCHINA CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

The disadvantages of this method are: firstly, the equipment investment is increased, and the operating cost of the device is increased; secondly, the content of light components in the quenching oil sent outside after stripping is small, and the outgoing pipeline is prone to blockage
As far as the actual operation of various devices in the domestic and foreign ethylene industry is concerned, the two visbreaking technologies have certain effects, but they are not ideal. Due to this limitation, the current temperature at the bottom of the oil washing tower is generally controlled at about 180°C-190°C, and the heat recovery is not enough. Well, making steam consumption go up and running costs going up

Method used

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  • Method for improving ethylene apparatus quench oil tower bottom temperature
  • Method for improving ethylene apparatus quench oil tower bottom temperature
  • Method for improving ethylene apparatus quench oil tower bottom temperature

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Embodiment 1

[0033] Taking the ethylene plant with an annual production capacity of 300,000 tons as an example, the quench oil cooling system shown in Figure 2 is adopted. The main equipment includes oil washing tower 1; quenching oil circulation pump 2; quenching oil heat exchangers 3, 4, 5; process water circulation pump 6; vapor / liquid separation tank 7; flow meters 8, 9, 10 and corresponding connected pipelines. And the number of groups of quench oil heat exchangers is designed as 3 groups.

[0034] The process flow is as follows:

[0035] The pyrolysis gas from the outlet of the cracking furnace is sent to the bottom of the oil washing tower 1 through the pipeline 27 after preliminary cooling, and is cooled by three streams of reflux at 27, 28, and 29. The heaviest quenching oil component in the material condenses to the bottom of the tower to form quenching oil. The oil enters the quenching oil circulation pump 2 through the pipeline 11 to boost the pressure, and is sent to the quench...

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Abstract

The invention relates to a method for increasing the temperature at a quenching oil tower bottom of an ethene device, which adopts the series of quenching oil heat exchanger and the forced circulation of fresh water; besides, a viscosity reductant and light fuel oil picked out from the middle section of an oil washing tower can be added into quenching oil. Application of the method of the invention can increase the temperature at the bottom of the oil washing tower, increase the generation amount of dilution steam, reduce the direct filling of the steam, ensure the stable operation of the device, save energy and reduce the operation cost of the device.

Description

technical field [0001] The invention relates to the steam cracking ethylene production industry, in particular to a quenching oil circulation system in the steam cracking ethylene production industry. Background technique [0002] At present, the world mainly uses steam pyrolysis process to produce ethylene. Raw materials such as naphtha are mixed with a certain proportion of diluting steam to undergo a cracking reaction at a temperature above 800°C. After compression, separation and other processes, chemical raw materials such as ethylene and propylene are finally produced. The raw material is mixed with a certain amount of steam during the cracking process, the purpose is to improve the selectivity of the cracking process and increase the output of ethylene. The pyrolysis gas from the outlet of the cracking furnace is cooled and sent to the bottom of the oil washing tower. After reflux cooling, the heavy components in the material condense to the bottom of the tower to fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C4/04
Inventor 刘玉东王来宗赵光燮饶东臣
Owner PETROCHINA CO LTD
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