脱硫废水烟道喷射的数值模拟  

Numerical Simulation of Desulfurization Wastewater Spray in Flue Duct

作　　者：张语晴 安璐 董长青[1] 张旭明[1] 

机构地区：[1]华北电力大学生物质发电成套设备国家工程实验室,北京102206 [2]华电光大环境股份有限公司,北京102206

出　　处：《工业炉》2017年第6期22-26,共5页Industrial Furnace

基　　金：中央高校基本科研业务费专项资金资助(JB2017041)

摘　　要：以某电厂300 MW燃煤机组为例,对脱硫废水烟道喷射系统进行CFD数值模拟,研究了雾化粒径、烟气温度、烟气流速和喷枪布置方式对液滴蒸发的影响。结果表明:雾化粒径明显影响液滴群蒸发质量百分比和蒸发时间,在较低的烟温下(140℃),需要较小的雾化粒径(≤50μm)才能保证液滴完全蒸发;烟气温度对液滴群蒸发质量百分比和蒸发时间的影响显著,随着烟气温度升高,液滴蒸发速率加快,蒸发时间明显减少;烟气流速对液滴蒸发特性影响不大,随着烟气流速升高,烟气量增大,液滴群蒸发时间会降低,而液滴群蒸发质量百分比变化不大;在烟道同一截面处,不同喷枪布置方式对液滴蒸发影响小。Taking a 300 MW coal-fired unit in a power plant as an example, the CFD software was used to simulate the injection system of desulfurization wastewater in flue duct. The effects of atomized particle size, flue gas temperature, flue gas flow rate and spray gun arrangement on droplet evaporation were analyzed. The results show that the atomized particle size significantly affects the percentage of droplet group evaporation and the evaporation time of the droplet group. At lower temperatures（140 ℃）,a smaller atomized particle size（≤50 μm） is required to ensure that the droplets are completely vaporized. The effect of flue gas temperature on the percentage of droplet group evaporation and the evaporation time of droplet group is significant. With the increase of flue gas temperature, the percentage of droplet group evaporation increases and the evaporation time of droplet group decreases. Flue gas flow rate has little effect on droplet evaporation characteristics. With the increase of flue gas flow rate, the flue gas volume increases, but the evaporation time of droplet group decreases, and the percentage of droplet group evaporation does not change much.At the same section of flue duct, the arrangement of spray gun has little effect on droplet evaporation.

关 键 词：脱硫废水 烟道喷射 雾化粒径 数值模拟 

分 类 号：X773[环境科学与工程—环境工程]