Research On Energy Efficiecy Evaluating Of Air-cooled Power Plant Based On Evidential Reasoning

In the end of 2013, the installation of air-cooled thermal power plant capacity reached 100 million kW in China. The share over thermal power plant capacity reached to 18%.The capacity of air-cooled units is much higher than the unit of wet coal consumption, so energy-saving need carry out.Currently in China’s thermal power plants, integrated energy efficiency (EE) evaluation system is not in place, nor is the EE potential clearly identified. Hence it is of primary importance to raise the energy efficiency of China’s electric power industry by conducting EE improvement in thermal power plants.An unit consumption analysis model for direct air cooled power plant is established in the paper which calculate additional consumption of the design conditions and the actual operating conditions of each device and obtain the spatial and temporal distribution of energy consumption of each thermal system, and analyzes the inherent energy saving potential and real operational energy saving potential.Additional consumption can not reflect the real-time operational performance of the air-cooled condenser.So using a Gaussian mixture model evaluat real operational performance of the Direct Air Cooled Condenser,obtain the actual conditions’draw declining Performance index of air-cooled condenser which is used to evaluate the energy efficiency of the unit.In view high additional consumption of the present air condenser, judge the efficiency of direct air cooling condenser using mixture gauss algorithm (GMM), to obtain the condensing steam condenser actual state of health.A multi-hierarchical comprehensive evaluation system that considers economical efficiency, environmental protection and unit reliability is proposed for EE evaluation of the direct air cooled power plant.The air-cooled unit comprehensive evaluation model is established based on the evidence theory of energy efficiency, and the corresponding algorithms is proposed.A case study is conducted for a 600MW subcritical Air cooled unit to evaluate the energy efficiency of 13 kinds of operating conditions, the unit were evaluated, According to the spatial distribution of additional consumption and energy efficiency evaluation results, conduct diagnosis and analysis of the energy efficiency of and guide energy saving.