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A kind of start-up emission reduction method of ethylene plant

An ethylene device, ethylene propylene technology, applied in ethylene production, petroleum industry, hydrogenation process, etc., can solve problems such as waste of materials, prolonging the start-up time, danger, etc., to avoid the risk of leakage, prolong the start-up time, and improve safety sexual effect

Active Publication Date: 2016-01-13
PETROCHINA CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once leaked, materials can only be returned, repaired, and pre-cooled again, which not only wastes a lot of materials, prolongs the start-up time, but is also very dangerous

Method used

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  • A kind of start-up emission reduction method of ethylene plant
  • A kind of start-up emission reduction method of ethylene plant
  • A kind of start-up emission reduction method of ethylene plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The following is an example of an ethylene unit that was hydrogenated before the previous depropanization process. The specific process flow of the ethylene unit is as follows:

[0046] like figure 1 As shown, the cracking furnace feed 101 (comprising naphtha, light hydrocarbons and hydrogenated tail oil usually) enters the cracking furnace 201, and the cracked gas 102 produced enters the high-pressure depropanizer 203 after being compressed by the compressor 202, and the low-pressure depropanizer Tower 204. In this system, the cracked gas is divided into carbon three and below components and carbon four and above components.

[0047] C4 and above components in the bottom of the low-pressure depropanizer 204 enter the follow-up system 205 for further separation.

[0048] The C3 and lower components 105 at the top of the high-pressure depropanizer 203 enter the hydrogenation reactor 206 to selectively hydrogenate alkynes and diolefins below C3 to form monoolefins 108, a...

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Abstract

The invention relates to a starting emission reduction method for an ethene device. The method comprises the following steps: first, an ethene and propylene refrigeration system is started and a refrigerating capacity is supplemented for cold box precooling; second, the cold box precooling is started; third, total reflux of an ethene rectifying tower, a propylene rectifying tower and an ethane removing tower is established; fourth, a cracking furnace is started; fifth, a cracked gas compressor is started; sixth, a subsequent device is started and starting of the ethene device is finished. Because the cold box is subjected to cooling before formal feeding, the product qualified time of the cold box is shortened greatly, the cooling process of the cold box is controllable, and leakage dangers are avoided. Through establishment of total reflux of a low-temperature depropanization tower, the total qualified time of a high-low-pressure depropanization tower is shortened. Because natural gases are introduced to supplement the feed of the compressor, the number of starting feeding cracking furnaces is decreased, and therefore the whole discharge capacity of torches is reduced.

Description

technical field [0001] The invention relates to a start-up emission reduction method of an ethylene plant, which belongs to the field of petrochemical industry. Background technique [0002] The ethylene plant is a leading plant that produces ethylene, propylene and other basic organic chemical raw materials through high-temperature cracking, compression, separation and other processes from raw materials such as naphtha, light hydrocarbons, and hydrogenated tail oil. The output and technology of ethylene mark a national petroleum The level of development of the chemical industry. By the end of 2012, my country's ethylene production had reached 14.8678 million tons, with 30 sets of ethylene production facilities. [0003] The conventional start-up plan of the ethylene plant is to first start the ethylene and propylene refrigeration system; the ethylene rectification tower, the propylene rectification tower, and the deethanizer tower are fully refluxed; then the cracking furn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G9/00C10G69/06C07C4/04C07C11/04C07C11/06
CPCY02P30/40
Inventor 魏弢徐强赵劲松魏铁锋李谷彦邱彤洪金慧张健陈丙珍隋丰伟王肃静宋光于家涛傅杰赵永臣张忠宝王美倩贺丁赵传钰丁哈泉张淑婧
Owner PETROCHINA CO LTD
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