Abstract: In the operation of domestic limestonegypsum desulphurization devices, the ash fouling and other faults often occurred which directly influenced the safety and stable operation of desulphurization equipment and could cause generation unit outage. The power plant should be severely punished by national environment protection department due to desulphurization equipment outage. By using practical examples, the feasibility and the necessity of eliminating the GGH were illustrated. Simultaneously, the problems created due to elimination of GGH were analyzed in detail, and relevant treatment measures were given.

Key words: flue gas desulphurization system, gas-gas heater, feasibility analysis, measure