摘要 |
A steam generator circulation system is provided and includes a boiler fee d pump for forcing water through an economizer, and through the waterwall tube s of an evaporator. A separator receives a mixture of steam and water and sends t he steam to a steam utilization unit such as a superheater. A valve is provided below the separator. If the valve is open, the saturated water from the separator is mixed with feedwater and recirculated through the tubes of the evaporator. If the valve is closed, recirculation is terminated. At loads below the critical point, the valve below the separator system would be open and the boiler would operate like a natur al circulation drum boiler. At loads above the critical point, the valve below the separator system would be closed resulting in a boiler that operates like a once--through boiler.
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