Carbon dioxide coal slurry preparation and gasification system

Abstract

The invention discloses a carbon dioxide coal slurry preparation conveying and gasification system. The carbon dioxide coal slurry preparation conveying and gasification system mainly comprises a carbon dioxide coal slurry preparation system, a gasification system and a synthesis gas purification system. The carbon dioxide coal slurry preparation conveying and gasification system is characterized in that carbon dioxide is liquefied at a normal temperature by pressurization, the liquefied carbon dioxide is mixed with coal so as to prepare coal slurry, after the coal slurry is defoamed and filtered, the coal slurry is fed into a gasification furnace by using a carbon dioxide coal slurry pump so as to be gasified, so that high-temperature high-pressure synthesis gas is obtained, and after the high-temperature high-pressure synthesis gas is purified and dedusted, the carbon dioxide is gathered and separated by using a carbon dioxide gathering unit, and the gathered carbon dioxide can be cycled to a slurrying system so as to be used for the preparation of the carbon dioxide coal slurry, and can also be used as carbon dioxide products or is used for the displacement of reservoir oil or geological storage. The carbon dioxide coal slurry preparation conveying and gasification system has the advantages of greatly improving the efficiency of coal gasification energy utilization, being capable of realizing the zero emission of greenhouse gases, being simple, stable and reliable in operation and low in investment and having relatively good large-scale popularization and application prospect.

Description

technical field [0001] The patent of the invention relates to a carbon dioxide coal slurry preparation, transportation and gasification system, which belongs to the technical field of energy clean utilization. Background technique [0002] The gasification process is a thermochemical process of carbonaceous substances. Gasification technology usually uses carbon-containing solid fuel powder such as coal or its liquid fuel as the raw material, and uses oxygen and water vapor as the gasification agent. After being injected into the gasifier through the burner, gas is generated under high temperature and high pressure conditions. Chemical reaction to produce high temperature and high pressure synthesis gas (or called coal gas) and slag. Syngas needs to be treated by cooling, purification and other processes before it is put into use. The ash generated after the input fuel is gasified also needs cooling treatment before it can be discharged from the gasifier. [0003] Said ga...

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Problems solved by technology

[0004] (1) The concentration of raw material coal-water slurry is usually lower than 65%, that is, more than 35% is water, and the system consumes a lot of water;

[0005] (2) Because a large amount of water is injected into the gasifier together with the coal slurry, the water gasification process absorbs a large amount of latent heat of vaporization, and the thermal efficiency is low, that is, the cold gas efficiency is low;

[0006] (3) Coal-water slurry gasification needs to be atomized at a higher speed, so problems such as burner wear and tear lead to a shorter service life of the burner

[0007] Dry pulverized coal gasification currently mainly adopts the high-pressure dense-phase airflow transportation method for pulverized coal transportation, and its transportation pressure is limited to a certain extent, and the pulverized coal transportation system is complicated, and the pulverized coal flow monitoring and control technology still needs to be further improved. Technology has become an important factor restricting the development of dry coal gasification technology

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