Performance Optimization And Economic Calculation Of Heat Network Heater Based On Thermal Power Plant

At present,Chinese demand for efficient use of energy and reduction of carbon emissions is increasing day by day,and the growth rate of energy demand has dropped to about 1% per year.In contrast,the efficiency of energy use needs to be greatly improved.And with the increasing requirements of energy conservation and emission reduction,performance optimization has become the premise and key to improve the operation efficiency of thermal power units.In order to ensure the heat supply of Fushun City,respond to the national policy requirements on the consumption of new energy,improve the flexibility of thermal power unit operation,and meet the requirements of the Northeast Power Grid’s power auxiliary service market operation rules,this thesis takes Fushun 2×300MW unit as the research object,and realizes the power plant system modeling and economic index analysis under three extraction conditions based on thermodynamics software.And through the completed modeling to achieve the performance of the heat network heater optimization and transformation.The main research contents of this thesis are as follows:First of all,the system theoretical models of the three extraction conditions of 100%,75%and 50% were established respectively.The original parameters of the three conditions were derived by thermodynamic software,and each thermal economic index was calculated without changing any parameters,which laid a foundation for the calculation of the following variable conditions.Secondly,in order to improve the thermal economy of the heating network heater,by reducing the throttling loss of the valve of the heating extraction pipe,the calculation of the variable working condition is carried out on the basis of the theoretical model.After the model is adjusted well,the data after the variable working condition is derived and the data of the thermal economy index is calculated.By comparing the thermal economy index of the original working condition and the variable working condition,it can be seen that After reducing the throttling loss,the thermal economy of the unit is improved.Finally,the system diagram of 100%,75% and 50% extraction conditions obtained by simulation and the data of the heater characteristic curve are compared and analyzed.After the change of working conditions,the thermal efficiency of the three extraction conditions increases,and the heat consumption rate of the power generation decreases.The thermal efficiency of the 100% extraction condition increases the most,and the added value is 1.28%.100% extraction condition also reduces the heat consumption rate of power generation the most,with a reduction value of 115.66KJ/KW·h.Through these two thermal economy indicators,it can be seen that after adjusting the throttle loss of the valve on the heating extraction pipe,the thermal economy of the unit has been improved to a certain extent.Four extraction conditions of 90%,80%,60% and 40% were adjusted respectively,and the thermal economic indicators of the four conditions were obtained through the calculation of simulation software.The thermal economic indicators of the seven different conditions were summarized,and it was concluded that the thermal economic indicators of the unit were the best under 80% extraction conditions.