Method and device for producing coal gas by pulverized coal pyrolysis

Abstract

The invention relates to a method and device for producing a coal gas by pulverized coal pyrolysis. The coal gas production method disclosed by the invention comprises the following step: with an unpurified raw gas which is obtained from raw coal by dry distillation pyrolysis as a raw material, producing the high-quality coal gas inside a regenerative chamber in a pyrolysis manner. The device disclosed by the invention comprises a raw coal drying oven, a dry distillation furnace, a regenerative chamber for pyrolyzing the raw gas, and a hot blast heater for supplying heat. The raw gas is pyrolyzed to produce the coal gas, water vapor in the raw gas reacts with coke powder to produce a water gas, and meanwhile tar is cracked into the coal gas, so as to serve multiple purposes. The method and device disclosed by the invention have the advantages of low energy consumption, low investment, high calorific value of the gas, low semicoke ash and low coal quality transformation cost.

Description

technical field [0001] The invention relates to coal dry distillation pyrolysis technology, in particular to a method and device for preparing coal gas by pyrolysis of coal. Background technique [0002] Coal gasification to prepare coal gas is an important process for coal conversion. The high-temperature and high-pressure coal gasification process requires complex equipment and large investment scale; the atmospheric pressure coal gasification process causes heavy pollution, low coal conversion rate, and low calorific value of coal gas. [0003] Obtaining coal gas through coal pyrolysis requires small investment and low cost, but most of the traditional coal pyrolysis is an internal heating process, with high nitrogen content in the gas and low calorific value of the gas. [0004] The gas produced by traditional external heating coal pyrolysis has a high calorific value, but the gas yield is low, the thermal efficiency is low, and the tar capture process is complicated. ...

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Problems solved by technology

[0002] Coal gasification to prepare coal gas is an important process for coal conversion. The high-temperature and high-pressure coal gasification process requires complex equipment and large investment scale; the atmospheric pressure coal gasification process causes heavy pollution, low coal conversion rate, and low calorific value of coal gas

[0003] Obtaining coal gas through coal pyrolysis requires small investment and low cost, but most of the traditional coal pyrolysis is an internal heating process, the nitrogen content in the gas is high, and the calorific value of the gas is low

[0004] The gas produced by traditional external heating coal pyrolysis has a high calorific value, but the gas yield is low, the thermal efficiency is low, and the tar capture process is complex

[0005] The traditional gas heat carrier pyrolysis of coal often needs to be coupled with coal gasification to be practical. In order to obtain tar, the gas heat carrier must be cooled and reheated, which consumes a lot of energy and is uneconomical.

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