Research of Real-time Monitoring Model for Calculating Exhaust Enthalpy

This paper first analyzed the significance and different arithmetic for exhaust enthalpy. Then the influences of relative factors on exhaust enthalpy were analyzed respectively on the foundation of energy balance theory in thermal system. A new calculation strategy was put forward, combined with the regularity in wet steam region and advantage of other arithmetic. Initial values were gained by curve extrapolation method in this new strategy, which also applied pressure ratio of last stage and efficiency of stage groups for enthalpy calculation in wet steam region. Thermal balance method was applied in iterative calculating, which centralized on last stages and reduced computational complexity. Concrete examples were given under different conditions based on one 300 MW unit in Xi Baipo power plant. And the calculation results show that new method is featured by swiftness accuracy and ease of practical application, which has important significance on real-time monitoring research work for unit performance.