拐形流道内烟气与水雾传热传质过程研究

More than 23 million tons SO2 is let out into the atmosphere every year through the combustion of coal, which brings great harm to the environment and economic of our country. It is very important for sustainable development in our country to study the mechanism and technology of desulfurization of flue gas from industrial boilers. The item being the base of the one of new flue gas esulfurization technologies is composed of two parts: one is the heat and mass transfer of single drop in spraying-separation process, and the other is the heat and mass transfer and chemical reaction between spraying mist and ash-laden gas. The mathematical model investigating the heat and mass transfer between spraying mist and ash-laden gas and the testing birth experimental and site determination is combined. It is fined that the size of mist effects the desulfurization efficiency only in short time beginning. When the Calcium Hydroxide slurry being absorbent medium the desulfurization efficiency is affected by gas velocity strongly and this action become great with the increasing of the length of reaction part. The separation efficiency in zigzag channel is greatly effected by gas entering velocity , it increases as increasing of the droplet diameter and rapidly ascends beyond the critical point. Wile keeping the water flux, the testing at site shows that the separation efficiency of the separator takes the great part for the desulfurization efficiency in whole apparatus, and the maximum desulfurization efficiency, which is about 60~70% with pure water being absorbent, appears when the size distribution of mist is at 60~100μm, mainly

锅炉烟道气与冷态泡沫水雾之间的热量和质量传递过程与烟气的温度、流速、压力，以及飞灰的成份、灰粒和水雾气溶胶的形态、尺度和性质有关；还受拐形气水分离器的结构形式、几何参数及表面特性的影响。本研究通过激光全息技术测定拐形流道内水雾及灰粒气溶胶的形态和尺度，分析烟气与水雾间热质传递机理，为高效、廉价的烟气脱硫新奠定基础。