Powder coal grading clean grading utilization technology using thermal dissociation as the first stage

Abstract

The invention discloses a dust coal grading clean multigang utilizing technique with decomposition as the first grade, which comprises the following steps: processing and sorting raw coal through raw coal processing machine; getting the raw coal with a finite grain size; entering into fluidized-bed drying pyrogenic installation; proceeding dry pyrogenic reaction; getting high carbon half pulverized coke; entering into multiple circulating fluidized bed gasifying installation; proceeding multiple circulating gasifying reaction; getting synthesis gas; leading into chemical industry production; entering solid phase ash coke with low carbon content into circulating fluidized bed boiler; flaming completely. This invention possesses stable craft and low cost, which can utilize all of heat energy in craft course.

Description

Technical field: [0001] The invention relates to a pulverized coal utilization technology, in particular to a classified clean utilization method of pulverized coal with pyrolysis as the first stage. Background technique: [0002] The existing pulverized coal utilization technology has many problems in gasification. When the gasification temperature is high, it is very uneconomical to decompose the high value-added hydrocarbon chemical products in coal into chemical raw material gas at high operating costs; gasification When the temperature is low, the cracking of these high-value-added hydrocarbon chemical products is incomplete, and it is even more uneconomical to increase the purification cost; in terms of combustion and utilization, burning the high-value-added hydrocarbon products that can be pyrolyzed and extracted from coal is itself a waste of resources. waste, and in the gasification process, the heat release of oxidative combustion and the heat absorption of steam ...

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Problems solved by technology

[0002] The existing pulverized coal utilization technology has many problems in gasification. When the gasification temperature is high, it is very uneconomical to decompose the high value-added hydrocarbon chemical products in coal into chemical raw material gas at high operating costs; gasification When the temperature is low, the cracking of these high-value-added hydrocarbon chemical products is incomplete, and it is even more uneconomical to increase the purification cost; in terms of combustion and utilization, burning the high-value-added hydrocarbon products that can be pyrolyzed and extracted from coal is itself a waste of resources. waste, and in the gasification process, the heat release of oxidative combustion and the heat absorption of steam gasification are performed in the same bed, and the continuous gasification has a lower calorific value. Or pure oxygen must have an air separation device, which has higher operating costs and complicates the combustion process. Secondly, the combined sulfur and nitrogen in the coal will generate acidic oxides under the oxidative combustion state, seriously polluting the environment, and making it It is more difficult to control or increase the cost of purification in terms of environmental protection and purification

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