Multi-pipe revolving low-temperature dry distillation technology of fine coal

Abstract

The invention discloses a multi-pipe revolving low-temperature dry distillation technology of fine coal. The technology comprises steps that: (1) fine coal requiring dry distillation is distributed into a cylinder of a multi-pipe revolving dry distillation machine; flue gas mixed and regulated in an air mixing chamber is delivered into a plurality of heat exchange tubes arranged in the cylinder of the multi-pipe revolving dry distillation machine; and fine coal in the cylinder is heated; (2) when heat is absorbed by the fine coal in the cylinder, the fine coal is pyrolyzed, such that hot semi-coke and dry distillation gas are produced; (3) the hot semi-coke is cooled in a coke cooling machine, the semi-coke is delivered to a next process, and is collected and stored; a next section is proceeded; (4) the dry distillation gas is delivered into a coal gas cooling, cool gas purifying, and tar collecting system; (5) the flue gas discharged after the heat exchanging process is delivered into a waste heat boiler for producing low-pressure vapor; a part of the low-temperature flue gas which leaves the waste heat boiler is refluxed for regulating the temperature of the flue gas, and another part of the low-temperature flue gas is delivered into a low-temperature flue gas system where the heat of the flue gas is recycled. According to the invention, the fine coal passes through a shell pass, and the flue gas passes through a tube pass. Therefore, problems of difficult material distribution, high requirements on cylinder thermal insulation and easily blocked pipe of the multi-pipe revolving dry distillation machine are solved.

Description

technical field [0001] The invention relates to a low-temperature dry distillation process of pulverized coal, in particular to a multi-tube rotary low-temperature dry distillation process involving low-order pulverized coal. Background technique [0002] The low-temperature dry distillation of coal can be divided into two types: internal heating type and external heating type according to the different heating methods. The internal heating process mainly includes Toscoal, ETCH pulverized coal rapid pyrolysis process, Lurgi-Ruhr gas (Lurgi-Ruhrgas, abbreviated as LR) process, coal solid heat carrier pyrolysis process of Dalian University of Technology, and its characteristics The heat is transferred to the material layer by means of heat carrier. Heat carrier can be gas or solid. The main disadvantage of the gas heat carrier pyrolysis process is that the gas heat carrier dilutes the gaseous product of dry distillation, reduces the gas quality, increases the gas separation ...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and provide a single-stage pulverized coal multi-tube rotary low-temperature carbonization process and system, which is aimed at bituminous coal, low-rank pulverized coal (including lignite, long-flame coal, non-caking coal , weakly sticky coal, gas coal, etc.) low-temperature carbonization process, using h

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