Analysis Of High Back Pressure Heat Supply Of 300MW Unit In Thermal Power Plant

The main topic of this study is to study the retrofit technology of thermal power300 MW high back pressure heating and the operation mode of the unit after the transformation.The main data of the unit after the transformation are obtained by analyzing the operation unit.High back pressure circulating water heating is to increase the pressure of the steam in the condenser,that is,to reduce the vacuum degree of the condenser,to improve the cooling water temperature,the condenser to the heating system of the heating network heater,and the cooling water Directly used as the circulating water of the heating network,make full use of condensing steam exhaust gas latent heat heating circulating water,the cold source loss is reduced to 0,thereby improving the unit cycle thermal efficiency.The use of this method is not to increase the size of the unit under the premise of reducing the amount of heating pumping,increasing the heating area,coupled with its construction period is short,significant economic benefits,so in the heating business There are applications.In the national energy-saving emission reduction policies to encourage and promote the power generation enterprises in the region with heating conditions for the original design of pure units for the implementation of heat and power transformation,has become an inevitable trend.There are already Shiliquan Power Plant,Yantai Power Plant,Zouxian Power Plant has completed the transformation,greatly improving the heating economy.But 300 MW grade high back pressure heating transformation case only Huadian Qingdao Power Generation Co.,Ltd.# 2 unit,Hohhot Jinqiao Thermal Power Plant # 2 unit.In this paper,a 300 MW high back pressure heating reform project of Huichao Jinqiao Thermal Power Plant # 2 unit is taken as a template to carry out comprehensive tracking of the high back pressure of the unit from the design scheme to the normal operation.Thecondensing unit is designed to meet the high back pressure heating Of the heating load analysis,low-pressure cylinder body modification and some other in the transformation process must solve the problem.And the operation of the heating unit to conduct a comprehensive observation and analysis,select the actual operation of the unit encountered several typical conditions to analyze the evaluation of the unit under different operating conditions,calculate the investment recovery cycle,and determine the most economical operation Adjust the way for the future power plant circulating water back pressure transformation to provide examples of transformation program reference and operational adjustment experience.