Developing
coal to synthetic natural gas (SNG) projects in China could alleviate
the conflict between supply and demand of natural gas. The coal to
SNG process based on Lurgi gasifier (Lurgi process) has been commercially
implemented. However, low energy efficiency and high production cost
restricted expansion of Lurgi processes. BGL gasifier developed based
on Lurgi gasifier is considered to be more appropriate for coal to
SNG projects. In this work, a novel BGL gasifier based coal to SNG
process (BGL process) is proposed and simulated based on rigorous
kinetics models. Based on simulation, techno-economic analysis and
comparison is conducted over the conventional Lurgi process. The results
show that objective energy efficiency of the BGL process is 8% larger
than that of the Lurgi process, while increase of general energy efficiency
is not obvious. Considering the income of product, ROI (return on
investment) of the BGL process is 3% higher than that of the Lurgi
process. However, the Lurgi process can produce more byproducts. If
considering values of these byproducts, the BGL process will not be
economically competitive.
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