Process study on microwave-assisted entrained flow gasification

In order to seek a kind of coal gasification process without any special requirements,such as the type of coal or the ratios of the water vapour and oxygen,the low-temperature low-pressure saturated steam was used as the single gasification agent,and microwave was used as an entrained flow auxiliary heat source,absorbing agent was used as the heat transfer medium for the gasification of anthracite,bituminous and lignite.The results were as follows,under optimum conditions of the orthogonal experiment,75 g anthracite was mixed with MnO2-based absorbing agent in accordance with the mass ratio of 3∶1.The mixture was gasified in the 800 W microwave power when the 158.7 ℃ steam flow was 2.2 L/s,and the stable gasification temperature was 1 966 ℃,the complete gasification time was 10.7 s.The microwave energy consumption per unit mass was only 114.2 kJ/kg,the content of hydrogen and carbon dioxide in the water gas made from the above conditions was 94.1%.When the stable gasification temperature was 1 742 ℃,the CO2 concentration was only 0.8%.A high temperature environment effectively inhibited the converting reaction.The composition-ratio curves of three typical water gas were rotated clockwise order by CO、CO2、N2、H2、O2、CH4.The small diameter gasification reactor had a faster speed and lower microwave power consumption.