A large pyrolysis device

Abstract

The invention provides a large pyrolysis device. According to the technical scheme, a material channel is formed by innermost heat exchange tubes, and the spacing distance between every two adjacent heat exchange tubes is gradually decreased from the feeding end to the discharging end, so that the tapered material channel of which the hole diameter is gradually increased from the feeding end to the discharging end is formed; a feeding device is a sleeve-type spiral feeding device with a hollow shaft, and the hollow shaft is communicated with an inner cavity of a barrel. Due to the fact that the spacing distance among the heat exchange tubes is determined according to volume changes and liquidity changes of materials in a pyrolysis kiln in the different stages, the materials can form efficient heat exchange material screens in all portions of the pyrolysis kiln; meanwhile, the discharging end also is the high temperature end, the diameter of the discharging end is decreased, therefore, the revolution diameter of the portion, located on a discharging cover, of the barrel is small, and a high-temperature-resistant sealing device with the high reliability and the low leakage amount can be conveniently manufactured; meanwhile, the hollow shaft is arranged, and therefore water vapor in the barrel can be extracted or purified gas can be added into the barrel according to the technological needs to meet the technological requirements.

Description

technical field [0001] The invention provides a large-scale pyrolysis device for fine particle materials, which can be used in the field of coal chemical industry for producing coal gas, tar, and semi-coke by low-temperature pyrolysis of pulverized coal, and can also be used in other low-temperature pyrolysis fields such as biomass pyrolysis. Background technique [0002] Low-temperature pyrolysis of coal is an important way to achieve comprehensive and efficient utilization of coal. High value-added gas, tar, and semi-coke with high calorific value can be produced through pyrolysis of coal, especially for low-rank coal. Its high moisture content, easy pulverization and other shortcomings can not be directly used. [0003] The existing low-rank coal pyrolysis equipment mainly includes vertical furnace, fluidized bed pyrolysis device, gas direct heat exchange rotary kiln, etc. [0004] The vertical furnace pyrolysis process is mature and the equipment cost is low, but the ma...

AI Technical Summary

Problems solved by technology

In the pyrolysis kiln with parallel heat exchange tubes arranged at equal intervals, due to the difference in the fluidity of the material in the low temperature state and the high temperature state, the movement trajectory of the material in the process of turning, lifting, lifting, and falling in the low temperature section and the high temperature section is quite different. , resulting in a large difference in heat transfer efficiency between the low temperature section and the high temperature section, resulting in heat loss and low overall thermal efficiency

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