Four-segment spray coal oxygen-enriched gasification method

Abstract

The invention discloses a four-segment spray coal oxygen-enriched gasification method. A four-segment spray coal oxygen-enriched gasification process is adopted; the spray coal with small particle (0.1-0.5mm) and an oxygen-rich gasification agent (the oxygen content is 96%) are boiled and gasified; the gasification reaction is complete; the carbon conversion rate is more than 90%; the coal utilization rate can be up to 86% and is improved by 26% compared with a traditional fixed bed intermittent gasification process; CO2 in high-temperature coal gas and cracked C are subjected to reduction reaction to generate CO at the reduction period; the CO2 content in the coal gas is reduced; the content of effective gas of the coal gas is improved; the effective gas achieves 89% and is close to the coal gas mass of the spray coal gasification technology; the high-temperature coal gas preheats the spray coal through a preheating cracking section and then passes through an afterheat recovery segment to generate steam, so as to achieve the target of fully utilizing afterheat; the thermal efficiency is improved to 79%; a water-sealing disc-type slag eliminator is adopted to remove sludge; and the pollution on the environment is reduced, so as to achieve the aim of clean production.

Description

technical field [0001] The invention relates to a synthetic ammonia coal gasification process, in particular to a four-stage foamed coal oxygen-enriched gasification method. Background technique [0002] At present, there are more than 500 nitrogen fertilizer plants in my country, and almost all of them use traditional atmospheric pressure fixed-bed coal gasifiers for the preparation of raw material gas for ammonia synthesis, and only a few have introduced pulverized coal gasification technology. Atmospheric fixed bed coal gasification technology must use Shanxi anthracite lump coal. Due to the expansion of domestic synthetic ammonia production scale in recent years, the supply of anthracite lump coal has been in short supply, and the price has risen sharply. Shanxi has a long distance and high freight rates, resulting in continuous increase in the cost of chemical fertilizers, and production and operation generally fall into a situation of loss. Many chemical fertilizer fa...

AI Technical Summary

Problems solved by technology

Due to the expansion of domestic synthetic ammonia production scale in recent years, the supply of anthracite lump coal has been in short supply, and the price has risen sharply. Shanxi is far away and the freight is high, resulting in continuous increase in the cost of chemical fertilizers, and production and operation generally fall into a situation of loss.

Many chemical fertilizer factories are forced to use fine coal to make briquettes mixed with lump coal, which requires an additional processing fee of more than 300 yuan per ton of briquettes

However, the investment in introducing foreign pulverized coal gasification technology is as high as more than one billion yuan, which is difficult for general chemical fertilizer factories to bear. At the same time, there are problems such as complex process, difficult operation, and short operation period under high temperature and high pressure.

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