Preparation technique of methanol by lignite gasification and special equipment thereof

Abstract

The invention relates to a process for preparing methanol from brown coal in gasification, which is characterized in that: the brown coal is crushed to brown coal powder of less 8; the brown coal powder is arranged into a totally-enclosed processing warehouse for being dried, and then is delivered into a direct-injection fluidization and gasification gas furnace in inside and outside cycle; the air and vapor are mixed to prepare the gasification agent with rich oxygen by adopting a transformation oxygen-enrichment adsorption process unit; the gasification agent is delivered into a furnace from the bottom of the direct-injection fluidization and gasification gas furnace in inside and outside cycle; and the clean water is sprayed into the furnace from the bottom. The fully mixed material in the furnace is implemented on high temperature and high pressure, so that which is cracked to generate the air with rich methanol, further, the high-purity methanol can be generated when the air with rich methanol is processed through separation, desulfurization, decarbonization and purification. The adaptability of low-quality feed coal can be expanded by taking the low-quality as raw material according to the process for preparing methanol, thereby the utilization rate of the desulfurization and gasification on the feed coal can be improved; the energy consumption can be lowered, the environmental quality can be improved; and the economical efficiency is stronger. The invention also provides special equipment so as to meet the needs of the process.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to the field of coal chemical industry, in particular to a process method for independently preparing methanol by using low-quality lignite. Background technique [0002] At present, my country's energy resources are characterized by rich coal, little gas, and oil shortage. According to my country's energy development and energy security strategy and the national "Eleventh Five-Year Plan Outline", the development of coal-based liquid fuels will be an important direction in the future. However, low-quality coal occupies a large amount of my country's coal resources. According to statistics, the national coal reserves are 262.84 billion tons, of which the low-quality coal material—lignite recoverable reserves is 70.83 billion tons, accounting for more than 1 / 4 of the national coal reserves. At present, the amount of mining in the country is small, and it can generally only be used in c...

AI Technical Summary

Problems solved by technology

But in fact, with the technical progress of methanol raw gas in the feed state, fuel movement state in the bed, bed pressure level and slag discharge state, etc., it also brings negative problems such as surge in investment and high maintenance costs. Affected the development of scale and market operation

[0004] In the current popular gasification gasification process at home and abroad, coal water slurry is usually used as raw material for high-temperature chemical reaction to generate methanol-rich gas. Due to the fluidity of the raw material group, the mixture with oxygen is insufficient in this process, and there are The low carbon utilization rate of raw materials, large water consumption, and environmental protection and other issues, to carry out targeted research and development, so that it can play a scale effect when the investment is only 40-50% of foreign technology, is the starting point of this invention, and it is also the goal point

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