Circulated coal gas heat carrier fluidized bed ash coal pyrolysis device and method

Abstract

The invention discloses a circulated coal gas heat carrier fluidized bed ash coal pyrolysis device and method. The device comprises a coal-adding system and a fluidized bed pyrolyzing furnace which is communicated with the coal-adding system and provided with a coke-discharging hole, wherein the gas distributor of the fluidized bed pyrolyzing furnace is communicated with a high temperature heating furnace, the coal gas outlet of the fluidized bed pyrolyzing furnace is communicated with a first-stage cyclone separator, a second-stage cyclone separator, a high temperature deep dust collector and a gas cooler in turn through a pipeline, the lower outlet of the gas cooler is communicated with a separator, and the gas outlet of the gas cooler is connected with the high temperature heating furnace and a coal gas delivering device respectively. The device has simple flow and does not require an air separation device; as the circulated coal gas contains a lot of hydrogen, the hydropyrolysis of coal is realized to a certain extent, the yield of oil is increased to above 12%; and the operating pressure can be increased to the medium / high level, and industrial clusters and polygeneration are applied on the basis of equipment scale expansion while the products such as coal gas with high calorific value, semicoke, tar and the like are prepared.

Description

technical field [0001] The invention relates to a pulverized coal pyrolysis device and method, in particular to a fluidized bed pulverized coal pyrolysis device and method using circulating gas as a heat carrier. Background technique [0002] With the rapid development of the national economy, my country's oil consumption is increasing rapidly, and our country is relatively short of oil resources. In order to reduce the dependence on imported oil, our country is implementing a diversified energy strategy. The development of pulverized coal pyrolysis technology is one of the strategies for implementing national energy diversification. Pulverized coal pyrolysis technology is a clean coal technology with good competitiveness because of its relatively simple method and low investment. [0003] Typical coal pyrolysis processes at home and abroad include: external heating vertical furnace process, internal heating vertical furnace process, Garrett process and TOSCOAL process in t...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method that can solve the problem that the current internal heating process uses air as a combustion aid, and the coal gas contains a large amount of nitrogen, resulting in low comprehensive utilization value of the gas, that is, using circulating gas as a heat carrier (circulating gas is heated to 900°C) ) and fluidized medium, so that pulverized coal is pyrolyzed at 500-600 ° C to produce high calorific value gas, semi-coke, tar and other products, a circulating gas heat carrier fluidized bed pulverized coal pyrolysis device and method

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