Turbine System Energy Consumption Analysis And Structure Optimization

In recent years, the capacity of non-fossil energy generating keeps growing fast in china, the ratio of thermal power units to the total installed capacity begins to decline, but its leading role will not change in the short term. The energy consumption of thermal power unit in china decreased continuously, compared with the developed countries, the coal-fired power generation units have a certain energy-saving space of optimization. The size and spatial distribution of energy-saving potential are calculated by analyzing the energy consumption and distribution of large-scale coal-fired power plant. And that can also provide data support for energy conservation and structure optimization. Energy consumption and distribution research of conventional super-critical power plant with capacity of 600 MW are done by using modeling and simulation technology, and structural optimization of unit system is performed.In this paper, energy consumption analysis and structure optimization of unit system were studied. The model of 600 MW turbine system was enriched and improved by using Matlab/simulink, the energy consumption of turbine system was analyzed with this platform. The influence of extraction steam pressure loss, heater's heat loss and drain cooler on heat economy of unit were mainly studied and calculated. Results show that extraction steam pressure loss and heat loss of high pressure heater effect greatly on unit's economy,and drain cooler effect less. At the same time, structure optimization of unit system was studied by further studying of energy consumption analysis, and hybrid heater and low temperature economizer were analyzed. In this paper, three kinds of hybrid heater scheme and four kinds of low temperature economizer scheme were proposed and the energy efficiency was calculated in THA condition. The result showed that one kind of hybrid heater scheme and one kind of low temperature economizer scheme were better than others. Energy efficiency under different working conditions of the two optimal schemes were analyzed and calculated, the result showed that its energy efficiency were maintained in low load conditions. The influence of shunt coefficient on optimal low temperature economizer scheme was considered, and the best shunt coefficient under various conditions was worked out, providing theoretical guidance for actual modification of steam turbine system.