Aiming at chemical cleaning for large scale unit boiler's superheaters and reheaters

a complex organic cleaning agent(COCCA)was developed.The agent's performance has been tested by simulating the actual chemical cleaning condition.The results show that

this new cleaning agent has excellent dissolution characteristics and anti-stripping properties for oxide skin on the superheaters and reheaters

thus can avoid blockage of the vertical U(W)tube during the cleaning.Moreover

the COCCA has good compatibility for metals used for the superheaters and reheaters:its uniform corrosion rate on the ferrite steel is lower than 1.0g/m2/h

with no pitting corrosion;the intergranular corrosion didn't occur on the austenitic stainless steel

so the COCCA didn't affect the austenitic steel's mechanical properties;no stress corrosion crack appeared on the austenitic steel with load limit stress.Therefore

the COCCA is an excellent chemical cleaning agents for superheaters/reheaters.