Compound coal gasification system and method of blast furnace slags

Abstract

A compound coal gasification system and a method of blast furnace slags relate to the blast furnace slag utilization technology. The system comprises a slag gasifier, a heat exchanger, a gas deduster, a gas storage tank, a coal feeding device, a spray gun, a secondary coal feeding device and a particle gasifier. The method comprises the following steps: the blast furnace slags are placed into the slag gasifier from a slag inlet through a slag runner; pulverized coal and gasifying agents are injected into the slag gasifier, the generated gas enters the heat exchanger, undergoes cooling and dedusting and then enters the gas storage tank; when flowing out of the slag outlet, the slags are mixed with the pulverized coal in a pipeline and react with the gasifying agents to generate gas which enters the heat exchanger, undergoes cooling and dedusting and then enters the gas storage tank. The method of the invention has enormous environmental benefits and is of significance to realize the national goal of energy conservation and emission reduction.

Description

technical field

[0001] The invention relates to blast furnace slag utilization technology, in particular to a blast furnace slag composite coal gasification system and method. Background technique

[0002] The iron and steel industry is an important basic industry of my country's national economy. China's iron and steel industry has developed rapidly since the 1990s. In 1996, my country's crude steel output has reached the first place in the world. With the growth of steel output, the solid waste produced by the iron and steel industry The total amount is also increasing, and among the solid waste, blast furnace slag accounts for a large proportion. Blast furnace slag is composed of gangue in iron ore, ash in fuel and non-volatile components in solvent. In the process of iron and steel production, the temperature of blast furnace slag is as high as 1400-1600 ° C. The sensible heat contained in it is It is equivalent to the heat generated by the complete combustion of 55Kg ~ ...

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