Abstract: Flue gas desulfurization（FGD）using activated coke is one of the main technologies for sulfur recovery.In view of
the high cost of activated coke in the desulfurization process of the current shaped particle activated coke moving bed，a
one-step powdered activated coke（PAC）preparation process for FGD was proposed and developed，which can carbonize
and activate pulverized coal ly.Based on the basic research data from the laboratory，a pilot-scale experimental device and
system with a PAC output of 30 kg/h was built，and a preliminary test for the rapid preparation of PAC was made.
Comparative analysis of the results from the pilot-scale experiment and experimental study was conducted.Under the pilot-
scale experimental conditions，the PAC yield prepared from Mengdong lignite was 38%，lower than that under experimental
condition.The pores of the PAC from the pilot-scale experiment were mainly micropores，whose pore volume and specific
surface area were better than the PAC from two lab experiments. The adsorption capacity of PAC from the pilot-scale
experiment was 6.1% per two hours.It was lower than that in two lab experiments，which should be caused by the difference
in particle size and pore structure. The volume fraction of combustible components（CO+H2+CH4）in pyrolysis gas，a by-
product in PAC preparation process in the pilot-scale experiment，was 7.3%，higher than that in lab experiments.The results
of the pilot-scale experiments preliminarily verified the feasibility of the process of PAC rapid preparation from lignite.

Key words: flue gas desulfurization, powdered activated coke, lignite, pilot test, pyrolysis gas