Improving Algorithm Study on Drain Heat Utilization of Regenerative Heating System with Equivalent Enthalpy Drop Method

Drain heat utilization system is a key part of energy saving for the thermal system. The partial analysis models of drain heat utilization with traditional Equivalent Enthalpy Drop Method (EEDM) based a different basis, and the algorithms are not well comprehensive. Based on the research on integrated mixing heater and through the mathematical derivation, the paper presented a consistent and comprehensive partial quantitative analysis model of drain heat utilization with the definition of mixing heater; the model is simple for analysis and easy to understand. The regular and meaning of the correction term in traditional EEDM was not presented, in the process of the above research, the algorithm of partial correction was presented with the partial analysis model of drain heat recovering. The extraction steam efficiency of changed condition should be used in the model when extraction steam efficiency changed that caused by the changes of thermal system structure or heater parameter. The correction algorithm is common and highly accurate and consummates the partial analysis model of EEDM.