Oxygenation intermittent coal gas preparation

Abstract

The invention discloses an intermittent coal gas (water gas and semiwater gas) preparation process for oxygenating in a fixed bed gas making furnace, which provides oxygen by utilizing the industrialized air separation oxygen preparing technology in China and automatically adjust the oxygenation concentration in air according to gas components generated in stages of blowing, ascending, descending and blowing-off of the gas preparation circulation so as to lead the furnace temperature to be stabilized at higher average temperature for less circulation fluctuation, thereby completely playing the heat efficiency during the gas preparation process, increasing the gas preparation temperature of the gas making furnace, improving the yield of the gas making furnace, lowering the consumption of raw material coal, reducing the discharge amount of the blowing and achieving the purposes of saving energy and reducing emission.

Description

technical field [0001] The invention relates to a coal gas preparation method, in particular to a fixed-bed intermittent gas preparation method for saving coal and reducing emissions. The method utilizes increasing the oxygen content in the furnace air to promote coal combustion and improve the decomposition time of steam and hot carbon layers. of heat. Background technique [0002] In the process of producing water gas and semi-water gas, how to use aerobic is a key technology. At present, most of the coal combustion process in our country adopts 21% oxygen in the natural air to support combustion. In the fixed bed gasifier, the coal in the fixed bed is basically oxidized intermittently, and the furnace temperature is increased to supply the heat required for steam decomposition to produce CO and H 2 , Generate water gas or semi-water gas as gas fuel and raw material gas for industrial production. In particular, the raw material gas (semi-water gas) for the production of...

AI Technical Summary

Problems solved by technology

This ancient production process has a low oxidation combustion rate and a slow heating rate, which reduces the amount of steam decomposition, high consumption of raw coal and steam, low gas production, and CO in the blown gas emitted. 2 and sulfide, causing serious air pollution

[0003] In the traditional water gas and semi-water gas preparation methods: the blowing stage uses natural air, which takes a long time, consumes a lot of air, and consumes a lot of electricity; the upward gas production stage uses natural air + steam, and the steam decomposition rate is low; the downstream gas production stage has a lower steam decomposition rate , CO 2 Large amount of production; natural air is used in the blowing stage, and the heating rate is slow

Therefore, the consumption of raw coal is high, the steam consumption is high, the quality of raw coal is high, and the environmental pollution is large. 2 and sulfide polluters

[0004] The above-mentioned backward gas preparation process, high energy consumption and high exhaust pollution have seriously affected the development of my country's coal chemical industry, especially the fertilizer industry.

The National Development and Reform Commission has made it clear that it will eliminate this ancient gas production method, which accounts for more than 70% of the national fertilizer industry's gas production process, but there is a lack of reliable alternative gas production devices

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