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《Journal of Engineering for Thermal Energy and Power》 2007-03
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Optimization of Open-close Mechanism of Circulation-pump Outlet Valves for a Thermal Power Plant with Condenser Operating Pressure being Considered

YANG Zhi, LIU De-you (College of Water Conservancy and Hydropower Engineering under the Hehai University, Nanjing, China, Post Code: 210098), CHEN Fu-shan (Jiangsu Provincial Engineering Consultancy Center, Nanjing, China, Post Code: 210003)  
When a transient hydraulic change occurs to the circulation water system of a thermal power plant, the condenser may be subjected to a loss of cooling water, leading to an increase of operating pressure of the condenser, and thereby affecting the operating stability and safety of a steam turbine unit. The optimized setting of the open-close mechanism of circulation pump outlet valves can play a definite role in controlling the maximal water loss amount to the condenser. The authors have proposed a method for combining the calculation of a hydraulic transition process with that of the off-design conditions of the condenser to optimize the setting of the valve open-close mechanism. The practical application of the above method for a 300 MW steam turbine unit shows that under the optimized mechanism determined by the method, the minimal flow rate of the condenser has increased from 1.991 m3/s to 2.271 m3/s while the highest pressure of the condenser decreased from 22.111 kPa to 16.911 kPa. As a result, the hydraulic safety of the circulation water system has been ensured with a simultaneous consideration of the dynamic characteristics of the condenser during the transient process, thus contributing to a safe and steady operation of the steam turbine unit.
【Fund】: 国家自然科学基金资助项目(50179008)
【CateGory Index】: TK264.11
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