High temperature gasifying method for solid carbon raw material

Abstract

The invention supplies high temperature gasification method for solid carbon containing material. It includes the following steps: separating the reaction of the burning generating gasification agent from reduction generating synthetic gas; processing the former by slag tapping before entering reduction chamber and directly discharging the liquid state slag without flowing through the reduction charmber to avoid carrying away the carbon powder; respectively controlling the reaction temperature of the burning chamber and reduction chamber that burning fuel and oxidizing agent in independent burning chamber; controlling the temperature higher than the ash fusing point; generating gasification agent including CO2 and H2O; separating the liquid state slag to the slag bath in the burning chamber; cooling the generated gasification agent and sending the carried slag into the slag bath; sending the cooled gasification agent into reduction chamber; spraying the carbon containing powdery material into reduction chamber at the same time; controlling the reduction reacting temperature at 1000-1300 degree centigrade to generate synthetic gas including CO and H2.

Description

technical field [0001] The invention relates to a high-temperature gasification method of solid carbon-containing raw materials, especially a method for producing combustible gas, synthetic gas and reducing gas from renewable fuels, fossil fuels, biomass or garbage. The invention can be used in power facilities, chemical industry and metallurgical industry to efficiently manufacture combustible gas, synthetic gas and reducing gas for use in engines, synthesis processes, ore reduction and pig iron production, etc. Background technique [0002] At present, there are quite a lot of gasification methods, and they can basically be divided into three categories: fixed bed gasification, fluidized bed gasification and entrained bed gasification. [0003] In a moving bed gasifier, the oxidant is blown into the bottom of the gasifier, and the resulting crude fuel gas moves up through the fixed fuel bed, and the solid fuel gradually moves down as the feedstock at the bottom of the bed ...

AI Technical Summary

Problems solved by technology

[0008] A common feature of the above-mentioned gasification equipment is that the oxidation and reduction reactions are carried out in the same space. Therefore, for the gasification furnace lined with refractory materials, the refractory materials in the combustion zone and the reduction zone bear almost the same high temperature. , almost all refractory materials need to be replaced for each maintenance; for gasifiers protected by water-cooled wall slag, the temperature in the furnace must ensure a certain thickness of solid slag on each part of the water-cooled wall and the fluidity of the outer layer of slag, which wastes a lot of effective It can reduce the calorific value of the syngas; at the same time, it is difficult to take effective measures to increase the raw material stroke and fully mix the carbon-containing particles and the gasification agent in the entire space on such a gasifier

Even if some gasification furnaces design the combustion chamber and the reduction chamber separately, they are not completely separated, and the above-mentioned defects are not avoided, such as Chinese patent ZL98810657.4 (plus German patent number), which is the same as the current entrained gasification furnace It is still not possible to control the temperature of the oxidation reaction and the reduction reaction separately. In particular, the liquid slag produced in the combustion chamber must be discharged through the reduction chamber. The solid raw material will inevitably mix and agglomerate with the liquid slag droplets permeating the reduction chamber and fall into the slag pool below, reducing the carbon conversion rate

Images