摘要
以燃煤锅炉产生的含尘热烟气为对象,针对石灰石–石膏法湿法烟气脱硫(wet flue gas desulfurization,WFGD)工艺,采用Vaisala-HMT337型温湿度变送器等测试仪器,考察了脱硫操作条件对脱硫净烟气温湿度的影响规律;借助MATALBA软件计算分析了脱硫净烟气与蒸汽在脱硫塔顶部的相变室内混合过程中过饱和水气环境的形成规律。研究结果表明:脱硫塔出口净烟气相对湿度随液气比和脱硫浆液温度的增大而提高,净烟气温度随液气比的增大而降低、随浆液温度的升高而升高;添加蒸汽后混合烟气的过饱和度随脱硫净烟气相对湿度和蒸汽添加量的增加而增大,随脱硫净化烟气温度的升高而减小。通过优化脱硫操作条件辅以添加适量蒸汽,可以在脱硫塔顶部的相变室建立细颗粒物凝结长大所需的过饱和水气环境,促进细颗粒物核化凝结长大并脱除。
An experimental investigation on the flue gas temperature and humidity characteristics at the outlet of desulfurization scrubber was conducted. Influence of the operating parameters for typical wet flue gas desulfurization （WFGD） technology of limestone-gypsum processes on flue gas temperature and humidity measured by a Vaisala-HMT337 type temperature and humidity sensor were analyzed. The experimental results show that increased temperature of the scrubbing liquid brings a higher relative humidity and temperature of flue gas. An increase in liquid-to-gas ratio causes a greater relative humidity but a lower temperature of flue gas, which is opposite to the inlet temperature of flue gas. The supersaturated water vapor environment established in flue gas has a great influent on the removal efficiency of fine particles, so a mathematical model for ideal mixing between high humidity flue gas and water vapor was established and numerically analyzed by MATALBA software. The simulation results indicate that the degree of super-saturation of the flue gas added steam increases with the increasing amount of vapor and humility of the original flue gas, but evidently decreases with the increasing temperature of the original flue gas. The supersaturated water vapor environment can be formed in flue gas by optimizing the operating parameters of wet flue gas desulfurization system and adding some amount of steam, inwhich fine particles could be promoted to grow up and then removed by a demister mounted at the top of the steam phase- change chamber.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2011年第8期18-24,共7页
Proceedings of the CSEE
基金
国家高技术研究发展计划项目(2008AA05Z306)
江苏省自然科学基金项目(BK2008283)~~
关键词
蒸汽相变
湿法烟气脱硫
细颗粒物
脱除
温湿度
heterogeneous condensation
wet flue gasdesulfurization
fine particles
removal
temperature andhumidity
