The Control Strategy of Main Steam Temperature for a 1 000-MW Double-Reheat Thermal Generation Unit and Its Application

doi:10.11930/j.issn.1004-9649.2017.06.027.05

Abstract

Abstract: Aim ing at the main steam temperature control of double-reheat units with time variation, large inertia and non-linearity, taking the characteristics of ultra-supercritical once-through boilers in consideration, the mechanism of the main steam temperature changing at the superheater outlet is studied. Then, a water spraying desuperheating control system is proposed based on the improved Smith predictor. The control strategies of the control system are designed for a 1 000-MW ultra-supercritical double-reheat tower-type boiler. The practical operation shows that the control system have effectively tackled the large delay and large inertia problems in the main steam temperature control of ultra-supercritical double-reheat units, improved the dynamic control qualities of the main steam temperature and at the same time alleviated the tuning difficulties.

Key words: coal-fired power generation, 1 000 MW, ultra-supercritical unit, double reheat cycle, main steam temperature, Smith predictor, demenstration power plant

CLC Number:

TM621

CUI Qingru, NIU Haiming. The Control Strategy of Main Steam Temperature for a 1 000-MW Double-Reheat Thermal Generation Unit and Its Application[J]. Electric Power, 2017, 50(6): 27-31.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2017.06.027.05

https://www.electricpower.com.cn/EN/Y2017/V50/I6/27

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