The distribution, composition and yield of coal-water slurry pyrolysis products have an important impact on the efficient combustion/gasification of coal-water slurry. In this paper, the coal-water slurry made of Shenmu coal (bituminous coal) is rapidly pyrolyzed by a high-frequency heating furnace, and the yield, composition and composition of pyrolysis gas were measured and analyzed. The effects of pyrolysis temperature, heating rate and residence time on the pyrolysis characteristics of coal-water slurry were studied. The results have shown that as the temperature increases, the yields of volatile matters and pyrolysis gas continue to increase. The compositions of pyrolysis gas are mainly H2, CO, CH4 and CO2. With the increase of temperature, the yields of H2, CO and CH4 increase first and then decrease, and peaks appear at around 1100℃. The CO yield continues to increase with increasing temperature. The rate of temperature increase affects the yield of volatiles. The research results provide a reference for understanding and mastering the formation characteristics of primary pyrolysis products of coal-water slurry. © 2022, Tsinghua University Press.

The influence of industrial processing parameters, especially high temperature, on NOx abatement in the absence of oxygen has been experimentally. NOx reduction efficiency is significantly promoted with increasing residence time and NSR and optimal residence time and NSR are 0.7s and 1.5, respectively, when temperature exceeds 1400 ℃. NOx reduction is strongly dependent on temperature. When temperature is lower than 1000 ℃, NO consumption is hindered due to lack of O radicals. The denitrification efficiency is significantly promoted with the increase of temperature because thermal decomposition of CO2 and NO is quite sensitive to temperature. However, NO formation from pyrolysis of HNO begins plays an important role since temperature exceeds 1400 ℃, which results in decline in NOx reduction efficiency. And the peak value of NO reduction efficiency can reach almost 100% at temperature range of 1300–1400 ℃ with NSR of 1.5. Four chemistry mechanisms have been adopted to simulate NOx reduction by ammonia. Validation shows that results calculated by POLIMI chemistry mechanism agrees better with experimental data than other 3 mechanisms. © 2022, Tsinghua University Press.