化工罐区大气环境影响评价中的技术探讨

摘要

The paper discussed the selection of forecast patterns and parameters for normal discharge of chemical tank farm atmospheric environmental impact assessment and environmental risk consequence assessment, and the making of environmental monitoring plan. The ullage of chemical tank big/small breathing should take non-point sources forecast model, which is more accord with the fugitive emission of chemical tank. In environmental risk consequence assessment, we should pay attention to the different diffusion parameters of chemical liquid leak and evaporation forecast and CC、SO2 diffusion forecast in conflagration accident,which will result in different outcome. P-C atmospheric diffusion parameter is more suitable for chemical liquid leak and evaporation forecast,while IAEA atmospheric diffusion parameter is more suitable for forecast CC、S02 in conflagration accident. In environmental risk consequence assessment,the weather condition of forecast model should take the joint frequency of anemorumbometer and degree of stability into account.%就化工罐区大气环境影响评价中储罐正常排放时预测模式的选取、风险事故后果评价预测模式和参数的选取、环境监测计划的制定等技术问题进行了探讨.储罐大小呼吸损耗应采用面源模式进行预测更符合罐区无组织低矮源排放的实际情况.在风险事故后果评价中,泄漏蒸发和火灾事故中C0、SO2等伴生污染物的扩散模拟所选取的扩散参数的不同将导致预测结果存在差异应引起评价人员足够的重视,研究认为P-G扩散参数适用于预测液化产品的泄漏蒸发,IAEA扩散参数适用于预测火灾事故中C0、SO2等伴生污染物的扩散模拟.事故后果评价中气象条件通常设定时应以当地多年的风向风速稳定度联合频率做为依据.