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Dry gas recovery system and dry gas recovery method for refinery plant

A technology of refinery dry gas and recovery system, which is applied in the processing of gas mixtures, petroleum industry, and processing of hydrocarbon oil, etc., can solve the problems of high energy consumption, limited process applicability, large investment, etc., and achieves lower investment and reduced investment. The whole set of equipment, the selective effect is good

Active Publication Date: 2015-03-18
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the problems of large investment, high energy consumption, and limited process applicability in the existing refinery dry gas recycling process in the prior art, the present invention provides a refinery dry gas recovery system and a dry gas recovery method

Method used

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  • Dry gas recovery system and dry gas recovery method for refinery plant

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Embodiment

[0059] Such as figure 1 As shown, a refinery dry gas recovery system. Including: compressor 1, absorption tower 3, reabsorption tower 5, desorption tower 4, cooler 6, throttle valve 7 and flash tank 8; compressor 1 is connected to heat exchanger 2 and then to absorption tower 3, absorption tower 3 The top is connected to the reabsorption tower 5, the bottom of the absorption tower 3 is connected to the desorption tower 4, the top of the desorption tower 4 is connected to the cooler 6, the throttle valve 7 and the flash tank 8 in turn, and the top of the flash tank 8 is connected to the inlet of the compressor 1. The absorption tower 3 is provided with a reboiler for the absorption tower; the desorption tower 4 is provided with a reboiler for the desorption tower.

[0060] The dry gas composition of a refinery is shown in Table 1.

[0061] Table 1

[0062] composition

[0063] The incoming material of refinery dry gas is 26700kg / h, and carbon four after ether is se...

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Abstract

The invention discloses a dry gas recovery system and method for a refinery plant. The system comprises a compressor, an absorption tower, a re-absorption tower, a stripping tower, a cooler, a throttle valve and a flash tank, wherein the compressor is connected with a heat exchanger, and is connected with the absorption tower; the top part of the absorption tower is connected with the re-absorption tower, and the bottom part of the absorption tower is connected with the stripping tower; the cooler, the throttle valve and the flash tank are sequentially connected with the top part of the stripping tower; and the top part of the flash tank is connected with the inlet of the compressor. The method comprises the steps of compressing, cooling, absorbing, stripping and liquefying dry gas of the refinery plant to obtain carbon 2-enriched products. The method has the advantages of a little equipment, low energy consumption, simple flow and high recovery rate, and the product is easy to store and transport.

Description

technical field [0001] The invention relates to the field of dry gas treatment in refineries, and more specifically, to a dry gas recovery system and a dry gas recovery method. Background technique [0002] Refinery dry gas mainly comes from the secondary processing of crude oil, such as catalytic cracking, thermal cracking, delayed coking, hydrocracking, etc. Generally, the content of ethylene in catalytic dry gas is relatively high, while the content of ethane in coking dry gas is relatively high, about 15% to 25%. In addition, refinery dry gas also contains alkenes such as propylene, propane and butane. At present, most refineries in my country still burn the refinery dry gas as fuel gas, which has low utilization value and causes great waste of resources and environmental pollution. [0003] Ethane is an ideal raw material for cracking, and a considerable part of it is converted into ethylene during steam cracking. If the ethane in the refinery dry gas is recovered and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G70/04C10G70/06
CPCC10G70/04C10G70/06
Inventor 李东风罗淑娟刘智信程建民廖丽华过良李琰王婧
Owner CHINA PETROLEUM & CHEM CORP
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