Method for rapid medium-low temperature dry distillation of coal by using microwave

Abstract

The invention discloses a method for carbonizing low-temperature coal of low metamorphic coal. The method adopts a microwave generation device as a heating source with the frequency of microwave of between 0.3 and 300 GHz; and the low metamorphic coal is heated to the a temperature of between 300 and 800 DEG C and is subjected to low-temperature carbonization to generate semi-coke, tar and coal gas. The method selects coal with shallow metamorphic degree as a raw material, utilizes a microwave radiation type heating mode to rapidly and selectively heat a coal material, depends on the dielectric property of the coal material to convert microwave energy and produce heat, utilizes the function of microwave activated molecules and achieves the aim of rapidly pyrolyzing the low metamorphic coal, thereby obtaining the semi-coke, tar and the low-temperature carbonization coal gas. The method has rapid coal pyrolyzing speed, can effectively improve the content of valuable compositions in the carbonation coal gas and is favorable for effective and comprehensive reclaiming of the coal gas.

Description

technical field [0001] The invention belongs to the technical field of coal pyrolysis, and relates to a method for low-metamorphic coal pyrolysis to produce semi-coke (semi-coke), coal tar and low-temperature dry distillation gas. It can also be used for coal drying, thermal power plant and boiler pretreatment before coal is put into the furnace, and extracts tar and valuable gas components in coal. Background technique [0002] With the increasing shortage of oil and natural gas resources, the further development and utilization of coal resources, especially the development of clean coal combustion and coal chemical technology has gradually become the focus of my country's energy development and utilization research. [0003] my country is a country rich in coal, short of oil, and low in natural gas. At present, my country's coal is mainly used for power generation, coking and power industries. Low-sulfur high-quality coal or coal types are usually required (such as gas co...

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Problems solved by technology

[0011] At present, domestic coal pyrolysis technology to produce blue coke (semi-coke) mainly includes coal solid heat carrier dry distillation polygeneration process, MRF pyrolysis process, STF pyrolysis technology, circulating fluidized bed thermoelectric technology based on fluidized bed pyrolysis Polygeneration process and heat and electricity polygeneration process based on moving bed. These methods can be summarized into two categories: external heat method and internal heat method. , although the quality of the gas produced is stable, but the heat transfer is uneven, the pyrolysis time is long, and the production efficiency is relatively low; the internal heat method uses the heat carrier to directly transfer heat to the coal material, which has the advantage of uniform heat transfer, but the generated gas will be It is diluted to increase the amount of gas and reduce the content of effective components in the gas, which is not conducive to the further comprehensive utilization of the gas, and the pyrolysis speed of coal is low and the pyrolysis time is long

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