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Research on Exhaust Steam Temperature Automatic Control of Ultra-supercritical Unit

Nowadays, more than 100 ultra-supercritical units have been put into operation. During the operation of ultra-supercritical units, the exhaust steam temperature often rises too fast, but traditional control strategy can’t effectively control temperature. As a result, the exhaust steam temperature is too high to trigger the turbine trip protection. This paper introduces the exhaust steam temperature automatic control strategy of ultra-supercritical unit. It analyzes the difficulty of temperature limiter control and cutting cylinder protection control, and it discovers the hidden danger of this strategy when the unit running under high loads. In order to avoid the hidden danger, the exhaust steam control optimization is carried out in this paper, and good application effect is achieved. The results show that the optimization strategy has high application value.