Coal to synthetic natural gas (SNG) process is regarded as one of promising way to tackle with haze in north China and is developed rapidly in China. However

coal to SNG processes suffer from the high energy consumption and CO2 emission due to the high carbon contents of coal. In China

there is 7×1010 m3 coke-oven gas (COG) produced in coke plants annually. Most of the hydrogen-rich COG is utilized as fuel or discharged directly into the air. Such situation is a waste of precious hydrogen resource and causes serious economic loss and environmental pollution either. The co-feed process of coal and COG to SNG is a promising solution for these problems. In the co-feed process

CH4 of COG reacts with CO2 in a dry methane reforming unit to reduce emissions and H2 of COG can adjust the H/C ratio of syngas. This paper makes a modeling

simulation and system analysis for the co-feed process of coal and COG to SNG. The results show that the energy efficiency of the co-feed process increases by 8%

while at the same time

CO2 emission is reduced by 60% in comparison to the conventional coal to SNG process.