Method and device using high temperature air and high temperature steam as gasification agents for coal gas production

Abstract

The invention belongs to the technical field of chemical coal gases, in particular to a method and a device using high temperature air and high temperature steam as gasification agents for coal gas production. According to the invention, coal gases are produced by using the air with a temperature of 120 to 220 DEG C and oxygen content of 20.93 percent (v / v) and the high temperature steam with a temperature of 120 to 220 DEG C as the gasification agents. Correspondingly, a heat exchanger, a control valve and a pipeline are additionally arranged in an original coal gas production device. According to the invention, the technical defects of gas production of a conventional normal-pressure fixed bed gas producer are well overcome; yield of a gas furnace and the calorific value of the coal gases are improved; carbon content in ash is reduced; sensible heat loss is reduced; standard coal consumption under the unit calorific value is reduced to 5 to 15 percent.

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 =...

AI Technical Summary

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

Images