A new two stage combined gasification process was proposed by the Institute of Clean Coal Technology

East China University of Science and Technology

which is of high-performance in reducing carbon dioxide emissions and can make the use of recycling sensible heat to make up the heat recovery deficiency of nowadays’ entrained gasification process. The effect of coal mass adding to the second stage and the gas compositions from the first stage on the heat value of the second stage’s outlet coal gas

the concentration of H2  and CO

the carbon conversion and the conversion of H2O and CO2 in the second gasification stage were examinated at hot-state in a two stage combined coal gasifier. The experiment results showed that this two stage gasification technology could utilize the sensible heat sufficiently and improved heat value of outlet coal gas. The optimized coal mass adding to the second stage was 1400g，which was 10% of the first stage’s coal mass. The excessive adding would result in tar formation and reducing reaction temperature of the coal layer in the second stage. The efficiency of recovery heat became more obvious with the increase of H2O and CO2 concentration in the first stage. Furthermore

it made great contribution to the environment with reducing carbon dioxide emissions.