Research On Optimization Operation For Steam Power Plant And Energy Conservation Retrofit Of Auxiliaries

The research of this article is aimed at energy conservation of the power plantunits. The main content consists two parts: the first is the research of the optimizationoperation of units, which is researching the methods and mode of the unit operation todirect the operation in site. The second is the reformation of energy conservation, inthis part, water ring type vacuum pump replacing water-jet air ejector and steamdriven feed water pump replacing motor driven feed water pump are taken asrepresentative. In the first part, the concept of the sliding pressure operation method isformulized, and the special features and economical efficiency are analyzed in detail.Meanwhile, aimed at the typical 125MW and 200MW units, optimizationexperimental investigation was entirely carried through. The optimization method andcurve of the constant pressure and sliding pressure conversion in maneuveringcondition are educed after the experiment. The conclusion that the open part of thegoverning valve in sliding operation method is better than the open all the governingvalve in sliding operation method is arrived. The article recommends the software of analyze and calculation of thermalperformance for power plant units. For the complexity of the thermodynamic systemof large units and the difference between all kinds of them, in the development of thesoftware, the article took these into account sufficiently so as to ensure the versatilityand the applicability of the mathematical model. Correction curve iteration methodwas taken to solve the difficulty of calculating the relative inner efficiency oflow-pressure cylinder. The developed software has the character of perfect function,strong fault-tolerance, good portability and friendly interface. It is a powerful tool tocalculate the parameters of heat economy for optimal operation of unit. The article analyzes the equipments of the vacuum air-ejector of condenser andthe way of reformation of energy conservation of it. After a lot of research and study,theoretical arithmetic and experimental investigation, considering the actual conditionof unit vacuum and operation level, the article brings forward the reformation optimaldesign scheme of vacuum air-eject of condenser system to meet the safety, stabilityand economical demand of operation. The performance experimental investigation ofthe reformed air-eject system is a good direction and reference for other plants. At last, the article use available energy analysis method to research the steamdriven feed water pump replacing motor driven feed water pump of 200MW unit. Theintegral performance test was taken after the reform. The unit's economical efficiencyafter reform was better than un-reformed old system through calculating the aggregatecost of the unit by teat data. Otherwise, the reform also improves the reliability andflexibility of the feed water pump.