Coal gas production method and device using high-temperature rich oxygen and high temperature steam as gasification agent

Abstract

The invention belongs to the technical field of chemical coal made gas, and particularly relates to a coal gas production method and device using high-temperature rich oxygen and high temperature steam as a gasification agent. The coal gas production method and device adopt oxygen-enriched air with the oxygen concentration of 25 ~ 30% and with the oxygen temperature of 120 ~ 220 DEG C and the high temperature steam with the temperature of 120 ~ 220 DEG C as the gasification agent for coal gas production; and accordingly, an oxygen-enriched air source and related a heat exchanger, a control valve and pipelines are additionally arranged in an original coal gas production device. The coal gas production method and device well overcome the technical defects of coal gas production by use of a traditional atmospheric-pressure fixed bed gas producer, increase the coal gas producer yield and the coal gas calorific value, reduce the carbon content of ash, and reduce sensible heat loss, and the coal gas unit consumption is reduced by 10 ~ 30%.

Description

technical field [0001] The invention belongs to the technical field of chemical coal gas production, and in particular relates to a coal gas production method and device. Background technique [0002] Atmospheric fixed bed gasifiers (also known as mixed gasifiers) usually use a mixture of air and water vapor as a gasification agent to produce gas. The working process is usually to add fuel from the top of the gasifier, and then from the bottom of the furnace. Introduce air or oxygen-enriched fuel to burn with solid fuel, store heat in the fuel layer, and then pass steam into the fuel layer to react with carbon to form water gas. The process of producing gas is mainly in the gasification layer. Generally, the main gasification layer Chemical reactions include the following oxidation and reduction reactions: [0003] C + O2 = CO2 + Q (1) [0004] 2C + O2 = 2CO + Q (2) [0005] C + H2O(steam) = CO + H2 – Q (3) [0006] C + 2H2O(steam) = CO2 + 2H2 - Q (4) [0007] C + CO2 =...

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Problems solved by technology

[0014] In order to balance the exothermic and endothermic processes and achieve the purpose of continuous gas production, it is more effective to use oxygen-enriched air (hereinafter referred to as oxygen-enriched) as the gasification agent. This production process requires less air pollution because it does not need to be vented. Because the heat of a single airflow direction is difficult to accumulate in the carbon layer, the gas outlet temperature is high, the sensible heat loss is large, and a large amount of dust is mixed in the gas, which puts forward high requirements for the treatment of the post-processing section, which is not good for the terminal gas consumption

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