The invention belongs to the field of
coal chemical, and discloses a
coal chemical poly-
generation process and a
coal chemical poly-generation
system. According to the invention,
coke and
oxygen-rich gas obtained after low-rank coal upgrading conversion and quicklime are adopted as raw materials;
calcium carbide is prepared by using an
oxygen heat method; and
acetylene is produced with a dry-method
acetylene production process. Part of
calcium carbide residue containing
calcium hydroxide is outputted as a by-product, and another part of the
calcium carbide residue containing
calcium hydroxide is calcined and prepared into
calcium oxide, which is then recycled as a
calcium carbide preparation unit
raw material. High-purity CO furnace gas produced by the
calcium carbide preparation unit is added into the
oxygen-rich gas, such that
molten carbonate fuel cell raw material is prepared and
electricity generation can be carried out. Further, heat contained in discharged gas of fuel
cell recovered with a heat
recovery technology and heat produced after
combustion thereof are respectively used for providing heat for a steam
Rankine cycle, a
raw material preheating unit, a
drying unit, and a calcining unit. Steam
Rankine cycle condensed water is pump-pressurized; heat contained in fuel
cell tail gas,
combustion unit
tail gas, calcining unit discharged water, and
drying unit discharged water are recovered; and
steam generation is carried out. With the process and the
system provided by the invention, energy
cascade utilization is realized.