Multi-generation method and device for preparing methanol, LNG and liquid fuel from coal

Abstract

The invention relates to a multi-generation method and a multi-generation device for preparing methanol, LNG and liquid fuel from coal. The device comprises an integrated system for extracting coal tar from pulverized coal and preparing methane-enriched synthesis gas, a synthesis gas purification system, a system for preparing LNG through cryogenic separation, a methane synthesis system and a coal tar deep processing system. According to the method and the device, multiple industries such as coal chemical products, coal gas, coal oil and the like are coupled and integrated to form a novel coal, oil, gas and chemical multi-generation process, efficient conversion and clean utilization of low-rank coal are realized, the additional value of products is greatly increased, and high technical feasibility and market competitiveness are achieved.

Description

technical field [0001] The present invention relates to the utilization of low-level coal resources by quality and classification, and the energy and chemical technology of coal-to-chemicals, coal-to-gas, and coal-to-oil cross-coupling, and specifically relates to a coal-to-methanol, LNG, and liquid fuel polygeneration method and device. Background technique [0002] Among my country's proven fossil energy reserves, coal accounts for about 94%, oil and natural gas account for about 6%, and the per capita remaining oil and gas reserves are only 6% of the world average, so it is difficult to further increase the production of oil and natural gas; my country The foreign dependence on oil and natural gas continues to rise, reaching 63.16% and 34.44% respectively in 2016. Non-fossil energy such as biomass, wind energy, solar energy, and geothermal energy have problems such as low density, intermittent, unstable, and high production costs. It is difficult to form a stable, effecti...

AI Technical Summary

Problems solved by technology

However, these two technologies have the disadvantages of low yield of low-carbon alcohols and no separation of low-carbon alcohols, high energy consumption and low yield of target products.

Although the above-mentioned invention patents partially involve the process route of coupling coal gasification with syngas to produce low-carbon alcohols and syngas to produce natural gas, none of them have fundamentally realized the classification and utilization of low-rank coal, and all Taking coal gasification as the leader, the follow-up process is then grafted with technologies such as low-carbon alcohol synthesis, synthetic ammonia, and CNG technology

The biggest problem in the coal gasification process is that the chemical components contained in the coal are not fully utilized, but all the molecules are interrupted to produce CO, H 2 , and then chemically synthesized

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