摘要
受机场附近160 m限高制约,辽宁某电厂需采用烟塔合一技术.运用德国AUSTAL2000模型分析了环境风速、大气稳定度、烟气出口速度、烟气出口温度等参数与烟气抬升高度间的关系,预测了烟塔排放的大气环境影响,并且与烟囱方案的大气环境影响进行了对比分析.结果表明,各类参数变化均会导致烟气抬升高度发生改变.环境风速不变,稳定度从A变到F时,抬升高度明显变小,最多可降低84.2%;相同稳定度条件下,环境风速从0.1 m/s增至4.4 m/s时,抬升高度明显变小,最多可降低84.3%;烟气出口速度从2.5 m/s增至8.0 m/s,抬升高度显著增加,最多为2.4倍;烟气出口温度从20℃增至50℃时,烟气抬升高度显著增加,最多为3.3倍.综合经济及环保因素,该项目烟塔高度取130 m较适宜.相比210 m烟囱方案,烟塔方案不仅满足机场限空要求,并且污染物年均及日均最大地面浓度均较低.
Stack-in cooling tower technology had to be adopted by a power plant in Liaoning Province due to the airport clearance limit of 160 m. The AUSTAL2000 model from Germany was used to calculate the relationship between the rise-height of the smoke and environmental parameters including wind velocity, atmospheric stability, outlet velocity and outlet temperature. The influenee of different tower heights on the atmospheric environment was predicted, and a comparative analysis of the influences from the stack-cooling tower and chimney scheme was conducted. The results showed that the rise-height could be affected by environmental parameters. When the wind velocity was kept eonstant and the stability decreased from A to F, the rise-height significantly decreased by a maximum of 84. 2%. When keeping the conditions stable and increasing the wind velocity from 0. 1 m/s to 4.4 m/s, the rise-height decreased significantly by a maximum of 84.3%. When the outlet velocity increased from 2. 5 m/s to 8.0 m/s, the rise-height increased significantly by a maximum of 2.4 times. When the outlet temperature increased from 20 ℃ to 50℃ , the rise-height increased by a maximum of 3.3 times. Taking both economic and environmental requirements into consideration, a height of 130 m was suggested as the appropriate design of the tower, since this height of stack-cooling tower scheme could not only meet the airport clearance limit requirement, but could also maximally decrease the annual and daily concentrations on the ground.
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2012年第12期1416-1421,共6页
Research of Environmental Sciences
基金
国家自然科学基金项目(40801228)
关键词
烟塔合一
烟气抬升高度
大气环境影响
stack-cooling tower
rise-height
atmospheric environmental impact
