The desulfuration system for 2×220 MW units in Chongqing Power Plant has already put into operation for more than four years up to now

the in-service ratio of equipment and the output of gypsum have been increasing year after year

however

along with the change of fuel coal market in our country

the sulfer content in practical fuel coal and SO

2

concentration in original flue gas all greatly exceed the designed values

many problems

such as decrease of desulfuration efficiency

reduce of quality for byproduct gypsum

corrosion and wornout in auxiliary system

and intensification of leakage and scaling etc.

have occurred in operation of said system.After using blend coal and operation measures

good result has been obtained.In case the unit is with full load

and the SO

2

concentration in original flue gas ≤10 000 mg/m

3

the desulfuration efficiency

can basically reach 95%

the quality of gypsum can also satisfy the controlled indices

reaching requirements of the market.