Crushed coal pressure gasifying process for producing synthetic gas

Abstract

The crushed coal pressure gasifying process for producing synthetic gas includes pressure gasifying of crushed oil in a fixed bed to produce crude gas, and the subsequent self-heating pure oxygen partial conversion of crude gas to produce synthetic gas. Thus produced synthetic gas has high effective gas (CO+H2) content, low CH4 content, less impurities and other advantages, and is suitable for large scale synthetic gas production.

Description

technical field [0001] The invention relates to the gasification of carbonaceous substances and the treatment of gas, in particular to the production of synthetic gas with low methane content, low pollutants and high content of effective gas components by using a fixed bed to carry out pressurized gasification of crushed coal method. Background technique [0002] The fixed-bed coal gasification technology uses 5-50mm crushed coal as raw material, and is widely used in the production of ammonia, alcohol, and industrial and civil gas because of its low coal treatment cost, high thermal efficiency and high maturity. With the expansion of scale and the advancement of technology, a variety of related processes have been developed, such as: Mond, Power Gas, Tully, Viag, GI, W-G, UGI, etc., especially after the emergence of GSP and Lurgi pressurization technology, it has made its scale capacity , coal type adaptability, thermal efficiency and environmental protection indicators ha...

AI Technical Summary

Problems solved by technology

At the same time, due to the low water vapor decomposition rate (30%-36%) of fixed bed gasification, the gas contains a large amount of undecomposed water vapor, resulting in the formation of a large amount of coal gas water in the synthesis gas production process, and the water contains complex tar, Pollutants such as dust and phenol greatly increase the treatment cost and investment of gas water, which is not only difficult to recycle, but also endangers the physical and mental health of operators and managers

Although the gas is rich in CH 4 Improved thermal efficiency, O 2 It is beneficial to reduce the consumption and increase the calorific value of the gas, but additional separation and conversion procedures are required for the production of syngas, which not only increases the system investment, but also requires an additional increase in the steam consumption for conversion; not only makes a large amount of unreacted steam condensate in the raw gas Gas water is formed, which cannot be effectively utilized, and additional reforming steam needs to be added in the subsequent methane reforming process, which complicates and inefficiencies the synthesis gas production as a whole

[0004] Although BGL, Ruhr100, KGN, IFE and IGI two-stage gasification processes have been developed in the world to adapt to the production of syngas, CH 4 The content is still high (KGN up to 4.0%, BLG up to 7.1%), and C m h n As high as 0.8%, the dust content has not improved significantly, and the dust ratio of oil (tar, medium oil and naphtha) is still 0.2-0.8, which has not fundamentally solved the problem of using fixed bed coal gasification technology to produce syngas such as high dust content , gas water treatment and rich CH 4 The problem of efficient conversion

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