Coal gasification method using oxygen-rich air, CO2 flue gas and steam as gasifying agents

Abstract

The invention relates to a coal gasification method, in particular to a coal gasification method in which oxygen enriched air, CO2 smoke and steam are used as gasification agents. In the method, the CO2 smoke is led out from a combustion gas kiln furnace and pressurized and evenly mixed with the oxygen enriched air according to certain ratio to form the mixed gas richly containing O2 and CO2, wherein the O2 content reaches 30 to 50 percent, and the CO2 content reaches 5 to 25 percent; the mixed gas is mixed with vapor to be used as a coal gasification device; and in the coal gasification device, the gasification agents and coal are subjected to oxidation reduction reaction to generate coal gas in which CO and H2 are main combustible components. In the invention, the coal gasification reaction process is completed, and CO2 in the smoke exhausted by the kiln furnace is used as a reactive substance and is reduced to CO, thereby increasing the CO content in the coal gas, improving the calorific power of the coal gas, lowering the consumption of the gasified coal, reducing the emission of CO2 in the smoke exhausted by the combustion gas kiln furnace and achieving the effective composition of energy conservation and emission reduction.

Description

Technical field: [0001] The present invention relates to coal gasification method, especially a kind of gasification method with oxygen-enriched air, CO 2 A coal gasification method in which flue gas and water vapor are used as gasification agents. Background technique: [0002] At present, coal gasification generally uses "air", "air-steam" or "oxygen-enriched air-steam" as the gasification agent to perform gasification reaction on coal to produce CO and H 2 Gas is the main combustible substance. The gas produced by the above technology is used for kiln combustion, and the CO in the flue gas produced 2 The content is generally between 15-25% (special industry kilns such as lime kiln flue gas CO 2 higher content), the emission of this flue gas greatly increases the greenhouse gas CO in the atmosphere 2 Concentrations seriously affect global climate change. Invention content: [0003] The present invention aims to provide a method capable of removing CO in part of the f...

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Problems solved by technology

[0002] At present, coal gasification generally uses "air", "air-steam" or "oxygen-enriched air-steam" as the gasification agent to perform gasification reaction on coal to produce CO and H 2 Gas is the main combustible substance. The gas produced by the above technology is used for kiln combustion, and the CO in the flue gas produced 2 The content is generally between 15-25% (special industry kilns such as lime kiln flue gas CO 2 higher content), the emission of this flue gas greatly increases the greenhouse gas CO in the atmosphere 2 Concentrations that seriously affect global climate change

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