关键词:

鼓泡吸收, 氨水, 热质传递, 空气冷却

Abstract:

A detailed description of the heat transfer and mass transfer during ammonia-water bubble absorption in air-cooled vertical finned tube is presented.The tube is externally finned.The ammonia-water absorbent and ammonia vapor enter the absorber at the bottom and leave at the top.A differential mathematical model for the heat and mass transfer is proposed based on mass and energy balances.The changes of the two-phase flow, such as churn flow, slug flow, and bubble flow, are analyzed.The heat and mass transfer between the vapor phase and the liquid phase in different two-phase flow, and the heat transfer from the two-phase flow to the air outside the tube are considered.Solving the differential equations, local values of some important parameters temperature,molar ratio and their variations along the absorber length are obtained.

Key words:

鼓泡吸收, 氨水, 热质传递, 空气冷却