Method for producing synthetic ammonia and methanol raw material gas by fixed-bed intermittent oxygen-increasing natural gasification

Abstract

The invention relates to a method for producing and synthetizing ammonia and methyl alcohol raw material gas by virtue of fixed bed intermittence type oxygenation nature gas, and the method is characterized by improving the concentration of oxygen in charged air of the traditional fixed bed intermittence gasification process to 22-65%. By utilizing the method, the defects of low blowing efficiency, low single-furnace output, high coal consumption, serious environment pollution, unstable oxygen enrichment continuous gasification operation, high gas carbon dioxide and methane and the like of the traditional intermittence gasification process are overcome, and the advantages of high enrichment continuous gasification gas production rate and low coal consumption are carried on, two gasification process advantages are innovatively integrated, and the purpose of playing up strengths and avoiding weaknesses is realized.

Description

Technical field [0001] The invention relates to the production of synthetic ammonia and methanol feed gas by using a fixed-bed gasifier batch gasification process. Background technique [0002] A cycle of the traditional fixed-bed intermittent gasification process is divided into five stages: blowing, up blowing, down blowing, second up blowing, and purge. The process flow is described as follows: (see figure 1 ) [0003] 1. Hair dryer: [0004] Air→Blower 1→Air manifold 2→Blowing valve 3→Gas stove→Upper air duct→Dust collector→Recovery valve 11→Blowing air recovery main 13→Blowing air waste heat centralized recovery→Venting (blowing air waste heat recovery process); or [0005] Air → blower 1 → air main pipe 2 → blowing valve 3 → gas stove → upper air duct → dust collector → upper blowing gas valve 7 → gas main valve 8 → gas main 12 → gas waste heat boiler → gas scrubber → gas holder (blowing Gas recovery process); or [0006] Air→Blower 1→Air manifold 2→Blowing valve 3→Gas stove→Upp...

AI Technical Summary

Problems solved by technology

[0020] The characteristics of oxygen-enriched continuous gasification process: mature technology, unstable operation (for existing low-quality raw materials); supporting air separation unit is required, one-time investment is large, and industrialized equipment has not yet been popularized; strong selectivity to coal types; high carbon dioxide in gas , high methane content, effective gas 65-72%; single furnace gas production is high, more than twice that of intermittent gasification; continuous upward blowing gas is always used, no blowing air is vented, and environmental pollution is small

[0021] After years of practice in optimizing the fixed-bed batch gasification process, the fixed-bed batch gasification process is simple, and air and steam gasification agents are used to make gas in stages. The overall quality is good, especially in the down blowing stage, the air quality is better than that of the up blowing process. The current energy consumption of this process is still high, the main reason is that air is used to heat up the blowing process, and the thermal efficiency is poor and the heat loss is large.

Oxygen-enriched gas is converted into continuous up-blowing gas production. The self-heating gas production method is carried out together with heat supply and gas production. The temperature difference is small, the gas production is large, and the environmental pollution is small. However, the content of carbon dioxide and methane in the gas is high, and the continuous and stable operation The time is short, and it is easy to slag and agglomerate when gasifying inferior raw materials, so it is necessary to stop the furnace regularly and manually remove the agglomerates.

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