Energy Consumption Distribution And Optimization Design Of Large Capacity Coal-fired Power Units

The pattern of coal-based power generation is determined by China's energy structure. Therefore, it is an important task for our thermal power to reduce the energy consumption of coal-fired generating units. In order to achieve energy saving targets, it is of great significance to make energy consumption analysis of large coal-fired power distribution units and to optimize the design of the steam turbine regenerative feed system. In this paper, attention is focused on the energy distribution of large coal-fired units and the optimization design of regenerative feed system. The main research work as follows:Firstly, based on consumption analysis theory, we intend to deduce the system calculation model of Additional Consumption (b,) for the major equipment of thermal power unit and to establish the spatial distribution model of large coal-fired power generating units of steady-state conditions. The major equipment includes boiler, steam turbine, heat heater, small steam turbine, condenser, the main reheat steam pipe, seal heater, condensate pumps and water pumps ect. Besides, Relative Consumption Effect Coefficient (μ1) is defined, which can direct-viewing shows heaters'contributions to energy-saving in coal-fired power units. Finally, this paper presents that the consumption analysis theory has great significance for energy saving of large coal-fired generating units.Secondly, based on energy consumption analysis theory of the spatial distribution model, the thesis takes cases to analyze 1000MW ultra-supercritical units,600 MW supercritical units and 600 MW air cooling units. By comparing and analyzing to the energy consumption of these three types of units, the results reveal preliminarily the rule of energy consumption space-time distribution for large capacity coal-fired power units.In the end, based on specific consumption analysis theory and variable condition theory, heater's Consumption effect (β1) and Relative consumption effect coefficient (μ1) are calculated. Therefore, it can provide data for the analysis of the the heater saving effect. In addition, the thesis takes cases to analyze heater's Consumption effect (β1), Additional consumption (b1) and Relative consumption effect coefficient (μ1). The purpose is to propose optimization design of regenerative feed system for 1000MW ultra-supercritical units. The unreasonable place existed in the heat regenerative system is found, and improvement plan is given. In the end, there are some economy analyses on the optimum design program, demonstrating the important realistic significance of specific consumption analysis theory.