Low-rank pulverized coal pyrolysis and semicoke gasification composite process system

Abstract

The invention provides a low-rank pulverized coal pyrolysis and semicoke gasification composite process system. A vertical preheater is connected with a feeding screw; the feeding screw is connected with a pyrolysis kiln; one branch of the pyrolysis kiln is connected with the preheater, while the other branch of the pyrolysis kiln is connected with a hot-blast heating furnace; the hot-blast heating furnace is connected with the pyrolysis kiln; the pyrolysis kiln is connected with a settling box; the settling box is connected with a high-temperature filter device; the pyrolysis kiln is connected with a semicoke gasifier; the semicoke gasifier is connected with a cyclone separator; the cyclone separator is connected with a waste heat boiler; the cyclone separator is connected with the semicoke gasifier; the waste heat boiler is connected with a steam pocket by use of a pipe; the low-rank pulverized coal is preheated to the range of 200-300 DEG C by use of a preheater, and then heated in a multi-tube heating rotary pyrolysis kiln to be pyrolyzed; and the pyrolysis gas goes into a subsequent filtering and cooling treatment device. The low-rank pulverized coal pyrolysis and semicoke gasification composite process system is capable of realizing integrated treatment of pulverized coal pyrolysis and direct semicoke gasification, and meanwhile, effectively and directly preparing a fuel gas or raw gas by use of thermal-state semicoke; the waste heat of the semicoke is utilized efficiently and a complex and low-efficiency semicoke waste heat recovery process is omitted.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a composite process system of low-order pulverized coal pyrolysis and semi-coke gasification. Background technique [0002] Low-temperature pyrolysis of coal is the most economical and reasonable technical approach to realize the comprehensive and efficient utilization of low-rank coal. Pyrolysis gas, tar and semi-coke with high calorific value can be obtained through pyrolysis. For the low-rank pulverized coal that has a large output in the market and is not easy to sell directly, it is more meaningful to use low-temperature pyrolysis method to fully realize its economic value. [0003] However, most of the existing coal low-temperature pyrolysis systems are limited to small-scale production process systems that can only process lump coal, and their environmental protection and economic performance are poor. Some low-temperature pyrolysis devices that...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the above-mentioned existing pyrolysis technology, the purpose of the present invention is to provide a low-order pulverized coal pyrolysis and semi-coke gasification composite process system. The present invention can realize the integrated treatment of pulverized coal pyrolysis and semi-coke direct gasification, can provide pyrolysis gas, and at the same time effectively use the hot semi-coke to directly produce fuel gas or raw material gas, and use the waste heat of semi-coke more efficiently. Eliminates the complicated and inefficient semi-coke waste heat recovery process

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