A dust removal method for pulverized coal pyrolysis high temperature gas

Abstract

The invention provides a method for removing dust through high-temperature coal gas in a pulverized coal pyrolysis mode. The method includes the steps that hot dust-containing coal gas is led into liquid-state coal liquefaction residues to be subjected to contact washing; dust-containing coal liquefaction residues obtained after contact washing are pyrolyzed, dust-containing coal liquefaction residues with low dust concentration are recycled, and dust-containing coal liquefaction residues with high dust concentration are pyrolyzed to recycle oil gas; the high-temperature coal gas obtained after contact washing is cooled and electrically captured to obtain pure coal gas and tar. As the coal liquefaction residues are used as a dust removal agent, dust removal efficiency is greatly improved; as medium intermiscibility between dust and the liquid coal liquefaction residues is good, the dust is easy to capture; as the coal gas obtained after dust removal is subjected to tar and coal gas separation, the quality of the tar is good; as the coal liquefaction residues with high dust concentration enter a pyrolysis furnace to recycle the oil gas, no pollutant discharge is generated in dust removal.

Description

technical field [0001] The invention belongs to the field of coal pyrolysis and relates to high-temperature gas, in particular to a dust removal method for pulverized coal pyrolysis high-temperature gas. Background technique [0002] There are many technologies for pulverized coal pyrolysis at home and abroad, but mainly include external heat pyrolysis, solid heat carrier pyrolysis, rapid gas pyrolysis, etc. Among them, the solid heat carrier has problems such as large dust in the gas and large ash content in semi-coke; the rapid pyrolysis of gas has problems such as large gas circulation, low thermal efficiency of heating and cooling cycle gas, and large dust in the gas, etc. Large dust is a common problem, and high-temperature gas dust removal has become a bottleneck problem for the industrialization of pulverized coal pyrolysis. [0003] There are also many high-temperature gas dust removal technologies, mainly particle bed, ceramic filter, stainless steel filter and oth...

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Problems solved by technology

[0007] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a dust removal method for pulverized coal pyrolysis high-temperature gas, using the by-product coal liquefaction residue generated in the coal pyrolysis process as the dust removal agent to solve the problem of high temperature in the prior art. The high cost of the dust removal process of coal gas and the difficulty of recycling and reusing waste in the coal pyrolysis process, while increasing the proportion of light components of tar, improving and improving the quality of tar, serve multiple purposes

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