Fixed-bed reaction device applicable to intermediate-temperature and low-temperature multi-atmosphere oriented coal pyrolysis

Abstract

The invention discloses a reaction device applicable to coal pyrolysis under intermediate-temperature and low-temperature multi-atmosphere conditions. The reaction device comprises a fixed-bed body. Heating walls are arranged on the side walls of the fixed-bed body and a base, a gas exhaust chamber, pyrolysis materials and gas injection channels are arranged in an inner cavity of the fixed-bed body, each gas injection channel is a space between an inner ring and an outer ring of an annular ring arranged close to the side walls of the fixed-bed body, the gas exhaust chamber and the pyrolysis materials are positioned in the inner rings of the annular rings, and the pyrolysis materials are positioned between the gas exhaust chamber and the gas injection channels; a gas outlet is formed in the gas exhaust chamber, a pressurization device is arranged on the gas exhaust chamber, gas inlets are formed in the gas injection channels, and gas exhaust devices are arranged on the gas injection channels; the pyrolysis materials are respectively connected with the gas injection channels and the gas exhaust chamber by gas injection nozzles and gas outlet nozzles. The reaction device has the advantages that the retention time of volatile matters such as oil and gas in the pyrolysis materials can be shortened owing to air supply modes by means pressurization gas injection and negative-pressure gas exhaust, secondary reaction in pyrolysis procedures can be inhibited, and the yield of pyrolysis oil and pyrolysis gas can be increased.

Description

technical field [0001] The invention relates to the field of energy technology, in particular to the field of low-temperature pyrolysis in multiple atmospheres in clean coal conversion and utilization technology. Background technique [0002] The medium-low temperature pyrolysis of coal is to extract volatile components such as tar and methane in coal through pyrolysis under mild conditions (medium-low temperature zone) to make chemical raw materials or high-quality liquid fuels, so as to improve coal utilization efficiency and realize coal production. Methods for clean conversion and utilization. However, the amount of tar obtained from traditional coal pyrolysis is small (about 10%), and the content of heavy components in the tar is high, which is not conducive to subsequent processing and utilization. In order to improve the yield and quality of tar, coal pyrolysis under multi-atmosphere conditions has been proposed. The principle of this process is to saturate the free...

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Problems solved by technology

[0005] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a fixed-bed reaction device suitable for the directional pyrolysis of medium-low temperature multi-atmosphere coal, which is used to solve the existing technical limitations in this field and cannot be applied to industrial applications technical issues

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