Industrial test study on pyrolysis-gasification of pulverized coal with carbon dioxide
In order to study the recycle of CO2 in the process of coal clean and efficient conversion,Xiwan coal with the particle size of 0 μ m to 300 μ m was continuously run in a pyrolysis-gasification industrial test device with a processing capacity of 36 t/d(referred to as"industrial test facility").The material and heat balance,operation and product properties of industrial test device with CO2 were investigated.The results show that under the conditions of pyrolysis temperature of 600℃,gasification temperature of 1000℃and reaction pressure of 0.8 MPa to 1.0 MPa,after CO2 participates in the pyrolysis-gasification process,the industrial test device runs stably,and the steam consumption per ton of coal decreases by 5.38%,and the content of effective gas(CO+H2)in syngas increases from 74.74%to 79.63%,and CO content increases by 10.43%,and H2 content decreases by 5.54%,and syngas calorific value,carbon conversion rate and energy conversion efficiency increase.The yield of tar increases from 15.91%to 16.25%,the density decreases from 1.06 kg/m3 to 1.02 kg/m3,the kinematic viscosity decreases from 3.42 mm2/s to 2.70 mm2/s,the mass fraction of sulfur decreases from 0.20%to 0.15%,and the corresponding temperature of the same quality of tar fraction decreases by 10℃to 30℃.The mass fraction of aliphatic hydrocarbon in tar increases by 7.53%,the mass fraction of aromatic hydrocarbon decreases by 5.47%,and the mass fraction of other compounds increases by 15.98%.
fluidized bedcarbon dioxidepyrolysis-gasificationindustrial test
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