燃气锅炉直接接触式节能装置设计模型研究

针对燃气锅炉排烟余热回收利用问题研发了一种新型直接接触式降温减湿节能装置,装置内部设置了填料段以强化传热传质效果.为建立和完善节能装置设计方法,对其填料段内的传热传质过程和设计模型进行了分析研究,以烟气温度tg作为自变量,建立了包含Lewis数Le和主体烟气湿比热CH、烟气水相界面处烟气湿比热CHi的求解填料段传热传质微分方程组,改进了填料段内传热传质过程参数分布及填料段高度的数值计算方法,数值计算结果与试验数据吻合良好,表明所改进的计算方法可应用于新型节能装置的设计与分析.

Investigation of the Design Model in Direct-contact Economizer for Gas Boiler

A new direct-contact dehumidifying economizer was developed,in which the packed mass was set for the recovery of waste heat in the flue gas exhausted from gas-fired boiler.An investigation of the heat and mass transfer process in the packed mass section and the design model was carried out to build and improve the economizer designing method.A set of differential equations were developed in which the flue gas temperature tg was used as an independent variable and the Lewis Number Le,the wet specific heat CH of mainstream flue gas and CHi of the flue gas on the phase interface between the flue gas and water were included.The differential equation set can be used to calculate the parameter distribution in the heat and mass transfer process in the packed mass section and the packed mass section height.The calculation results agree well with the experimental measurement.This has proved that the calculation method developed can be applied in the design and analysis of the new direct-contact dehumidifying economizer.