Abstract: The heat in hot steel slag could be recycled through dry reforming of coke oven gas，and coke oven gas（COG）
and carbon dioxide from coke ovens and steel plants could be utilized simultaneously. Kinetic analysis and mechanism
study on thermal conversion process of carbon dioxide and COG were made. Effects of temperature，volume flow ratio of
CO2 to COG at inlets（ψ），volume flow of COG at inlets（qVCOG（in）），pressure（p）and reaction atmosphere on dry reforming
process were investigated quantitatively，and reactants conversion and products formation mechanism in the process were
analyzed. The calculation results demonstrate that，in order to obtain the product gas with a hydrogen-carbon ratio of 2，
1 600 — 2 100 K is the suitable range for reaction temperature and 0.16 — 0.21 is the suitable range for ψ for direct dry
reforming process of crude COG when p is 0.1 MPa and qVCOG（in） is 1 cm3/s. At this time，the yield of syngas（γsyn）is 0.76 —
0.92，and conversion rates of tar and CO2 are 90% and 80%，respectively. Adding H2O into the reforming medium can
facilitate tar conversion slightly，but decrease the conversion rate of CH4 and CO2，as well as syngas yield. Addition of O2
would increase the reaction temperature，CH4 conversion rate and syngas yield.

Key words: coke oven gas, carbon dioxide, dry reforming, tar, molten slag, kinetic analysis