The invention belongs to the technical field of comprehensive
coke-oven gas utilization, and particularly relates to a method of combined production of
methanol and
liquefied natural gas (LNG) in a
coking plant.
Coke-oven gas is subjected to temperature swing adsorption (TSA), desulphurization,
vacuum pressure swing adsorption (VPSA), and other purifying treatment, and is subjected to cryogenic liquidation separation to obtain a
liquefied natural gas (LNG) product. The main component of the non-liquefied part is (CO+H2), and is adopted as
methanol synthesis gas used for producing
methanol, wherein the insufficient carbon component based on the H2is supplied by continuous
oxygen-rich gas production from chopped
coke having a size of 7-24 mm by a normal-pressure gasifier. The method achieves direct utilization of CH4 that is one of the main components of the
coke-oven gas, the (CO+H2) are directly used for methanol synthesis, and the insufficient
carbon source is supplied by a normal-pressure gasifier adopting the chopped coke produced by the
coking plant as a gas production
raw material, and therefore intermolecular conversion and other main energy-consumption sections and high-investment devices are reduced, the whole process is simplified, the comprehensive
energy consumption for producing the methanol and the
liquefied natural gas (LNG) is low, the whole economic benefit of coking enterprises is increased, and the investment is saved.