Vertical-type bidirectional-heating low rank coal rapid pyrolysis device

Abstract

The invention discloses a vertical-type bidirectional-heating low rank coal rapid pyrolysis device. According to the vertical-type bidirectional-heating low rank coal rapid pyrolysis device, a sealedpyrolysis space is formed among an external barrel, an internal barrel, an upper end cover, and a lower end cover; the periphery of the external barrel is provided with a spiral coiled pipe which is taken as a heated gas channel; the side wall of the upper part of the external barrel is connected with a pyrolysis gas discharge device; the internal wall of the internal barrel is provided with a spiral plate, so that a heated gas spiral channel is formed in the internal barrel; the external wall of the internal barrel is provided with a plurality of blades; the upper end cover is provided with amaterial inlet connected with a feeding device; the internal barrel is driven by a variable frequency motor; two material outlets are arranged on the lower end cover symmetrically, one of the material outlets is opened, and the other one is designed for standby applications; the opened material outlet is connected with a material cooling device. Full utilization of the flowing properties of heated gas is realized, an internal heating source and an external heating source of materials are designed, so that rapid, continuous, anaerobic pyrolysis of materials is ensured, heating area is enlargegreatly, retain time of introduced gas is prolonged, full release of heat energy is realized, reverse wall-between contact of hot flue gas with the heated materials is realized, heat transfer temperature difference is large, charcoal residue heating temperature is high, and full pyrolysis is realized.

Description

technical field [0001] The invention relates to a vertical two-way heating low-rank coal fast pyrolysis device, which belongs to the field of coal cracking and is used for fast pyrolysis, carbonization or drying of low-rank coal powder and solid organic matter. Background technique [0002] my country's energy structure is characterized by rich coal, poor oil, and little gas. In 2016, my country's raw coal output was 3.41 billion tons. According to the State Council's "13th Five-Year Plan" Comprehensive Work Plan for Energy Conservation and Emission Reduction, the proportion of my country's coal consumption will be controlled at Within 58%, so coal will still be the main energy source in our country. 55% of my country's coal is low-rank and high-volatile coal. Low-rank and high-volatile coal mainly includes lignite and long-flame coal. If this part of coal is directly burned or gasified, useful coal tar and gas resources will not be obtained. recycle and re-use. For this rea...

AI Technical Summary

Problems solved by technology

Since the coal material is not in direct contact with the heat carrier, the heating area is often insufficient, the thermal resistance of the coal material is large, and the heat transfer efficiency is low. The production capacity of the rapid pyrolysis device of the indirect heating method is generally low.

The horizontal rotary kiln rapid pyrolysis device is mostly used. The cylinder of the rotary kiln rapid pyrolysis device is horizontally rotated and heated. The coal material can only fill the lower half of the cylinder, and the effective heating area is only half of the cylinder area. The remaining pyrolysis gas is heated to produce secondary pyrolysis, the tar yield is low, the content of heavy components is high, and the production capacity is low; especially the furnace body is constantly rotating, and the pyrolysis device is fed, slag discharged, gas discharged, and sealed safety and environmental issues

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