The invention discloses a method for preparing
hydrogen and
liquefied natural gas through using a gas
retort raw gas. The method comprises the following steps: carrying out adsorbing pretreatment of the gas
retort raw gas for removing
tar and
naphthalene in the gas
retort raw gas, and allowing the obtained gas retort raw gas to enter a
coal gas holder for buffering; pressurizing the buffered raw gas, allowing the pressurized raw gas to enter a
sulfur-tolerant shift conversion reactor, and reacting
carbon monoxide with steam to generate
carbon dioxide and
hydrogen; carrying out PDS wet desulphurization of the obtained shift conversion gas to obtain a byproduct
sulfur, and regenerating a desulphurization liquid; carrying out a two-stage PSA (
pressure swing adsorption) technology of the desulphurized shift conversion gas for carbon removal and
hydrogen extraction; sending the obtained hydrogen to a
tar hydrogenating apparatus as a
raw material; carrying out pressurization and fine desulphurization of the obtained hydrogen extracted and desorbed gas, allowing the obtained gas to enter a
methanation reactor, carrying out a
methanation reaction of hydrogen in the desorbed gas,
carbon monoxide and
carbon dioxide to generate
methane,
drying the obtained generated gas, and allowing the generated gas to enter a cooling box; and liquefying
methane through adopting a mixed refrigerating agent liquefying process to prepare the
liquefied natural gas. The method increases the recycling efficiency of hydrogen and the comprehensive utilization efficiency of the
raw material, and realizes the efficient and comprehensive utilization fo the
coal pyrolysis raw gas.