A two-stage entrained-bed gasifier

Abstract

The invention discloses a two-stage airflow bed gasification furnace. In the case of dry coal powder entrained bed gasification, it is necessary to develop a gasifier that is cleaner, has a longer service life, and has a higher carbon conversion rate and gasification reaction intensity. The present invention is characterized in that the outlet of the pre-gasification chamber is obliquely inserted into the main gasification chamber, and the ratio of the height from the center of the outlet of the pre-gasification chamber to the bottom of the main gasification chamber to the diameter of the main gasification chamber is 0.3-2:1 ; On the vertical section, the angle α formed by the axis of the pre-gasification chamber and the axis of the main gasification chamber is 30~90°; on the horizontal section, the angle α formed by the axis of the pre-gasification chamber and the tangent line of the main gasification chamber β is 30-90°; the top of the pre-gasification chamber is provided with a coal gasification burner, and the main gasification chamber is provided with a gasification agent nozzle. The invention improves the service life of the furnace lining and reduces the fuel waste caused by coal powder falling into the slag pool through the slag outlet, and is very suitable for the occasion of using coal powder to prepare industrial gas.

Description

technical field [0001] The invention relates to the reaction of coal, biomass, petroleum coke and other solid carbon-containing fuels with gasification agents to generate CO and H 2 The field of gasification reactors, especially a two-stage entrained-bed gasifier. Background technique [0002] Pulverized coal entrained bed gasification technology is clean and efficient, and it is the development direction of coal gasification technology. Entrained bed gasification technology uses pulverized coal as raw material and has no special requirements for coal types. Almost any coal type can be gasified. It is planned in an oxygen-enriched and pure oxygen environment, and the coal conversion efficiency is high, which can reach more than 98-99%. There is no tar in the produced gas, other small molecule pollutants are easily removed, and the gas has a high calorific value, which can completely replace natural gas as the preferred fuel for industrial enterprises. [0003] Dry coal pul...

AI Technical Summary

Problems solved by technology

After the furnace lining is damaged, it will quickly erode the water cooling wall, resulting in damage to the water cooling wall until the shutdown

[0006] 2. The coal input of pulverized coal gasifiers in the industrial gas preparation industry is usually relatively small, generally 20-200 tons per day, which is far from the 1000-3000 tons of large-scale pulverized coal gasification. During actual operation, it is found that Insufficient slag thickness on the surface of the furnace lining in the furnace, the effect of using slag film to protect the lining is poor, and the service life of the furnace lining is short

These black pulverized coal particles not only cause the waste of pulverized coal, but also pollute the circulating water of the slag pool, causing environmental pollution

[0008] 4. Uneven reaction intensity in the gasifier

The kinetic energy of the airflow rotation in the gasifier is mainly formed by the burner jet. The coal powder enters the furnace from the burner. The mixing kinetic energy is high at the beginning and the temperature is high. The active part of the coal particles is easily gasified. With the deepening of the gasification reaction, the semi-coke particles enter the low mixing kinetic energy area far away from the burner. These semi-coke particles have the lowest activity and are the most difficult to gasify coal char particles, so it is easy to cause the residual carbon in the coal particles to be lost. After complete gasification, the residual carbon content in the fly ash at the outlet of the gasifier is relatively high, which affects the coal conversion efficiency

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