Abstract
The aim of the work is using an experimental-computational method to study the process of air-steam-blown entrained-flow gasification of coal with multistage air supply. To achieve this aim, the experiment was conducted on a plant consisting of a swirler into which coal and air are supplied, and a reaction chamber into which steam and multistage air are supplied; the experiment was numerically simulated using a validated CFD model; and the process under study was analysed using the obtained experimental and calculated data. The conducted experimental and computational studies of air-steam-blown gasification allowed determining the effect of steam supply and multistage air supply on the features of the gasification process. Steam injection lowers the temperature of the gas mixture and increases the concentration of hydrogen due to the hydrogasification reaction. The air supply to the reaction chamber increases the temperature of the mixture due to the burning of part of the syngas, while the syngas heating value is reduced by an appropriate amount. The maximum concentration of the syngas combustible components (and hence syngas heating value) is observed before the second point of air supply to the reaction chamber.
Highlights
The gasification of solid fuel, in particular coal, is found in many energy units: gasifiers, steam boilers, activated carbon plants, etc
The conducted experimental and computational studies of air-steam-blown gasification allowed determining the effect of steam supply and multistage air supply on the features of the gasification process
Steam injection lowers the temperature of the gas mixture and increases the concentration of hydrogen due to the hydrogasification reaction
Summary
The gasification of solid fuel, in particular coal, is found in many energy units: gasifiers, steam boilers, activated carbon plants, etc. The multistage supply of reagents (as well as steam injection) allows controlling the temperature and concentration of reagents in certain areas of power plants It has long been widely used in the energy sector, for example, in power boilers to reduce the formation of thermal nitrogen oxides, multistage (three-stage, reburning) combustion is used [2]. In gasification technology, this principle helps to solve many problems [3]: to increase the chemical efficiency, the carbon conversion rate, to ensure stable slag removal [4], etc
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