The secondary spray attemperators are installed on the connecting pipe between the Platen Superheater outlet header and the Secondary Superheater inlet header, one on each side. The size of the secondary spray water pipe is Φ133×18mm. The electric control valve installed on each of the two pipelines adjust the spray water flow in two lines to equal percentage and flow orifices are installed to measure the spray water flow amount. The electrical-driven stop valves are installed at both upstream and downstream of the electrical-driven control valve. The electrical-driven check valve is installed at the front of attemperator. The secondary superheater attemperator is venturi type too. In accordance with the design requirement, the primary spray water flow is restricted by the allowable lowest steam temperature entering to the Platen Superheater header. While the primary spray water flow fails to control the steam temperature and the fine adjustment is required, the secondary spray attemperator shall be run into service.
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