Low-order powdered coal pyrolysis system and method

Abstract

The invention provides a low-order powdered coal pyrolysis system and method.The low-order powdered coal pyrolysis system comprises a drying lift pipe, a first cyclone separator, a first screw feeder and a pyrolysis reactor.The pyrolysis system is suitable for processing powdered coal, gas heat carrier is not needed, pyrolysis oil and gas resources are guided out fast, tar is small in secondary reaction and high in quality, pyrolysis gas is not diluted, the heat value is large, the dust content of pyrolysis oil and gas output by a pyrolysis furnace can be effectively reduced, and the number of heat preservation facilities, between the pyrolysis reactor and a pyrolysis oil and gas fast condensation device, of a pipeline can be reduced.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a low-order pulverized coal pyrolysis system and a low-order pulverized coal pyrolysis method. Background technique [0002] my country's energy structure is characterized by rich coal, poor oil, and little gas. As the world's largest coal producer and consumer, coal resources will remain unshakable as my country's leading energy source for a long period of time. According to statistics, my country's proven coal reserves are 114.5 billion tons, of which medium and low-rank coal (lignite, low-modified bituminous coal) account for about 55.15% of the country's retained resources. Because low-rank coal has the characteristics of high moisture content, easy weathering, difficulty in sorting, and unsuitable for long-distance transportation and storage, its comprehensive utilization is greatly restricted. Among them, direct combustion power generation is one of the most common utiliza...

AI Technical Summary

Problems solved by technology

In the dry distillation process of Toscoal solid heat carrier, the ceramic balls have mechanical wear during the circulation process, and the process of pneumatically lifting and transporting the ceramic balls has a certain degree of wear on the inner wall of the pipeline and equipment. The pyrolysis reactor adopts a rotary kiln, and the pyrolysis The generated oil and gas have a long residence time, the secondary reaction of oil and gas is severe, and the quality of tar decreases. After pyrolysis, it is difficult to completely separate semi-coke and ceramic balls.

The German Lurgi-Spuelgas low-temperature pyrolysis process and the Shenfu SH type internal heating vertical carbonization furnace process are both suitable for processing lump coal, but not suitable for pulverized coal pyrolysis. Gas heat carriers are used, and the pyrolysis oil and gas resources produced after pyrolysis are absorbed by the gas heat carrier. Dilution, low calorific value, large condensation of pyrolysis oil and gas resources, large volume of lump coal, low heat transfer coefficient, low heat transfer efficiency, long pyrolysis time, violent secondary reaction of oil and gas, low quality of tar, and huge equipment, Difficult to operate

[0005] Therefore, the current coal pyrolysis process still needs to be improved

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