Doosan Stays Cool Thanks to CCI

CCI recently designed and manufactured some of the largest turbines for supercritical steam conditioning applications for Doosan’s coal-fired Yong Hung power plant. Supplied by CCI Switzerland, these two turbine ventilator valves for the two supercritical 800 MW units are among the largest turbines in the world for supercritical steam conditions.

The valves are 7-in. x 10-in. (180-mm x 250-mm) with a 5-in. (130-mm) seat. The purpose of the valves is to protect the high-pressure turbine from overheating during startup and turbine load rejection. Therefore the valves are hydraulically operated and have a spring to safely open the valve within one second against the steam pressure whenever the turbine protection system sends the trip signal. The valves have a design pressure of 3436 psig (238 bar) and a design temperature of 1047 F (564 C).

Supplying this type of valve for a General Electric licensed turbine is a first for CCI. Within one week after receiving an inquiry from Doosan, CCI proposed a new design for the
valve that is simpler and more cost-effective than the previous design.

Published in SOLUTIONS Spring 2003