A new wet limestone−gypsum process for flue gas desulfurization (FGD) has been developed.
The main difference compared to a conventional wet FGD process is the ability of the new process
to utilize granular limestone directly as a desulfurizing reagent. Thus, the pulverizing of
limestone, which causes power consumption, can be avoided. The performance of the wet FGD
process using granular limestone was confirmed to be equal to or higher than that of a
conventional process in various tests. Tests were also performed in a 2000 m3
Normal/h demonstration plant introducing actual flue gas of various types of coals at Matsuura Thermal Power
Station of the Electric Power Development Co., Ltd. (EPDC) in Japan. It was also confirmed
that the desulfurization performance of the granular limestone FGD process was not decreased
by aluminum−fluorine-containing compounds in the absorbing slurry as much as in the
pulverized limestone case. In this new wet FGD process, gypsum quality was also higher than
that in a conventional wet FGD process.
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