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为分析低温余热发电ORC直接接触式蒸发器内分散相在连续相中的传热性能,分别选用新型环保有机工质R245fa和THERMINOL66导热油作为分散相和连续相,进行ORC直接接触式蒸发器传热性能的研究,分析了初始传热温差、工质体积流量和导热油质量流量对ORC直接接触式蒸发器容积传热系数的影响.结果表明:容积传热系数随着传热时间的增加先呈增大趋势,然后逐渐减小并趋于平稳,但大于传热开始阶段的容积传热系数;在工质体积流量和初始传热温差为定值的情况下,为获得较大的容积传热系数,导热油质量流量应控制在较小的范围内.
In order to analyze the heat transfer performance of dispersed phase in continuous phase of ORC direct contact evaporator with low temperature waste heat power generation, new environmentally friendly organic refrigerants of R245fa and THERMINOL66 were used as disperse phase and continuous phase, respectively. ORC direct contact evaporation Heat transfer performance of ORC direct contact evaporator was studied.The results show that the volumetric heat transfer coefficient decreases with the increase of heat transfer time Increase first and then increase, then decrease gradually and become steady, but larger than the volumetric heat transfer coefficient in the initial stage of heat transfer; in the case of a constant value of working fluid volume flow and initial heat transfer temperature, in order to obtain a larger Volumetric heat transfer coefficient, HTF mass flow should be controlled in a smaller range.