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Feed gas separation method and apparatus of coal gasification apparatus

A kind of separation method, raw material gas technology

Inactive Publication Date: 2009-07-08
成都蜀远煤基能源科技有限公司
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Problems solved by technology

[0002] At present, the raw material gas from the coal gasification unit of the chemical plant is basically composed of CO and CH 4 、H 2 , due to the methane gas CH 4 The existence of it is very unfavorable to the synthesis of ammonia or methanol by using raw material gas, affecting the synthesis rate of products and increasing energy consumption

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  • Feed gas separation method and apparatus of coal gasification apparatus

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[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. However, it should not be construed that the scope of the above-mentioned subject matter of the present invention is limited to the following examples.

[0035] As shown in the figure, the method for separating using the separation device of the present invention includes the following steps:

[0036] (1) The purified raw gas is cooled to -165°C—-160°C in the heat exchanger E601;

[0037] (2) The cooled raw synthesis gas enters the scrubber T601, and the reflux ratio of the scrubber is controlled to be 0.05-0.1 according to the content of methane in the raw synthesis gas; the higher the methane content, the greater the reflux ratio, as an embodiment of the present invention When the methane content is 10%, the reflux ratio is 0.07, and when the methane content is 12%, the reflux ratio is 0.1. To obtain synthesis gas with CH4 content l...

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Abstract

The invention relates to a separation system for separating carbon monoxide / hydrogen into a fluid for a downstream to serve as synthesis gas and separating liquefied methane (LNG) into another fluid for commercial sale in raw material gas which comes from a coal gasifier and comprises basic constituents of the carbon monoxide, the hydrogen and methane. The separation system adopts a double tower flow of a scrubbing tower and a CH4-CO rectifying tower, and most of raw material synthesis gas is scrubbed and then forms the synthesis gas with the content of the methane lower than 1 percent at the tower top in reasonably controlling the reflux ratio; and a liquid phase after the scrubbing is sent into the CH4-CO rectifying tower, and separated CH4 is liquefied into the LNG. The CH4-CO rectifying tower has small flow, reduces 10 percent of separation power consumption compared with a single tower flow, and can also reduce the number of tower plates, so the double tower flow reduces the height of the tower, saves cost, and also ensures that the raw material synthesis gas has smallest resistance consumption to the synthesis gas. The separation system has the advantages of a small discharge amount of waste gas, environmental protection, and energy conservation, and has good economic benefit and social benefit.

Description

technical field [0001] The invention relates to a method and device for separating raw material gas from a coal gasification device. Background technique [0002] At present, the raw material gas from the coal gasification unit of the chemical plant is basically composed of CO and CH 4 、H 2 , due to the methane gas CH 4 The existence of ammonia is very unfavorable to the synthesis of ammonia or methanol from raw material gas, which affects the synthesis rate of products and increases energy consumption. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method and device for separating raw material gas from a coal gasification device that can effectively separate and utilize methane gas, and has the characteristics of environmental protection, energy saving and low cost. [0004] In order to solve the above technical problems, the method for separating raw material gas from a coal gasification device of the pre...

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Application Information

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IPC IPC(8): F25J3/02C10J3/00
CPCY02E20/18F25J3/0223F25J3/0233F25J3/0271F25J3/04563F25J2200/74F25J2200/78F25J2215/04F25J2260/44F25J2270/12F25J2270/14F25J2270/42F25J2290/34
Inventor 周勇李传明王磊黄顺泰
Owner 成都蜀远煤基能源科技有限公司
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