External heating water gas gasification method

Abstract

The present invention relates to the technology of coal gas production, especially the external heating water gas gasification method using anthracite coal to produce water gas. The technical problem to be solved is to provide a method with simple method, large water gas output and low energy consumption when producing synthesis gas The external heat type water gas gasification method adopts the technical scheme that steam enters the through pipe and feeds water vapor into the material cooling chamber to cool the high-temperature solid product after water gas gasification, and at the same time form superheated steam; superheated steam enters the gas The gasification chamber of the gasification device, and the high-temperature anthracite carbon materials meet for water gas reaction to generate high-temperature hot water gas; the high-temperature hot water gas is passed into the hot gas heating type steam generator to heat water to form water vapor, and then the hot gas heating type steam generator The generated water vapor is passed into the steam pipe to supplement the water vapor required by the water gas reaction; the water gas produced by the present invention has a large output and high hydrogen content, and is an ideal synthesis gas product, which can be used as a reducing gas for direct reduction of iron.

Description

technical field [0001] The invention relates to coal gasification technology, in particular to an external heating water gasification method utilizing anthracite to produce water gas. Background technique [0002] Water gas is a low calorific value gas obtained by reacting water vapor with hot anthracite or coke. The main components are hydrogen and carbon monoxide. Carbon and steam mainly undergo the following water gas reaction: [0003] C+H2O===(high temperature) CO+H2 [0004] The above reactions are endothermic reactions, so heat must be supplied to the gasifier. Usually, air is sent into the furnace first, part of the fuel is burned, heat is stored in the fuel layer and the regenerator, and then steam is passed into the scorching fuel layer for reaction. Due to the heat absorption of the reaction, when the temperature of the fuel layer and the regenerator drops to a certain temperature, air is sent into the furnace again to raise the temperature, and the cycle is lik...

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Problems solved by technology

The furnace structure adopts the UGI (named after the United Gas Improvement Company) gasifier type, which has the advantages of simple equipment and easy operation; the disadvantage is: due to the low production intensity of normal pressure operation, the production requires high-pressure synthesis The gas consumption is high and the production efficiency is low. The amount of water gas generated per square meter of furnace area is about 1000m3 / h, and the requirements for coal types are relatively strict. Usually, anthracite or coke with certain particle size requirements must be used. When using intermittent operation, the process pipeline is relatively complex

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