| With the implementation of the national energy saving and emission reduction industrial policies and the reduction of the contradiction between the supply and demand of electricity,the new power supply points are constantly put into operation,the development of high energy consumption enterprises is restricted,the annual utilization hours of power generation equipment are continuously low,the price of coal continues to rise,and the consumption sex index and consumptive cost of power plants are rising year by year,resulting in the fixed power production.The continuous rise has led to a decline in the economic efficiency of enterprises.In this regard,the power supply and consumption of coal significantly higher power plant will become increasingly severe business situation,and will face fierce competition.With the gradual implementation of the "energy-saving scheduling" policy,the number of hours obtained by the power generation enterprises with high coal consumption and poor operating economy is bound to be reduced,thus falling into the vicious cycle of high coal consumption? low utilization hours(low load rate)?higher coal consumption? less use hours,the market rule of the fittest In use,it eventually leads to the shutdown of high energy consuming enterprises.In order to maintain a good development advantage in the increasingly fierce competition of the power generation market,the power generation enterprises must take effective measures to reduce the power consumption level of the turbogenerator,which is the necessity of the historical development.At present,improving the relative internal efficiency of steam turbines and optimizing the relevant thermodynamic system is a very effective way to save energy and reduce consumption.By implementing these means,the same amount of coal can be burned to generate more electricity.The total installed capacity of a power plant is 5X600MW+2X1000MW units.The object of this study is unit 5(600MW).According to the action plan for the prevention and control of air pollution issued by the State Council(national [2013] No.37),"Beijing Tianjin Hebei,the Yangtze River Delta,the Pearl River Delta and other regions should strive to achieve the negative growth of the total coal consumption" and "coal consumption projects should be replaced by coal reduction".Therefore,the general principle of design is to increase the consumption of coal before and after the transformation.The main purpose of this transformation is "energy saving transformation",and the unit capacity increase after the unit efficiency is increased is the collateral benefit of this energy saving transformation.As far as possible through the technical upgrading and structural optimization within the three main engines,and supplemented by the transformation of the part of the auxiliary machine and the optimization of the system,in order to avoid large external changes,the unit can be reduced and reduced consumption,reduce the cost and cycle of transformation,save energy and reduce consumption,make the unit heat consumption,unit efficiency and plant electricity rate.To achieve the advanced level of domestic benchmarking units.Through the research and design of the thermal performance improvement scheme of the unit,such as: steam turbine flow modification,optimization and improvement of part of the thermal system,etc.Emphasis is placed on the calculation and comparison of the thermal economic indicators before and after the reform.The object of this study was revamped in February 2016 and the unit performance test was carried out in March 2016.The test results show that the heat consumption under THA condition is 7836.5 kJ /(kW.h)after the unit renovation,which is 332.21 kJ /(kW.h)and 4.07% lower than that under THA condition before the unit renovation. |
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