摘要
为了改善某大型轮胎厂炼胶车间的通风状况,以降低其生产过程中反应器及车间堆放的初加工物料造成的H2S和NH3污染,根据车间污染源分为南北两部分的特点,通过车间中部送风、两侧排风,按功能分区进行通风的方式对通风系统进行了改进,设计了新的通风方案,使改进后的系统按最短路径将污染物排出车间,避免其在车间内部的掺混。并采用Airpak软件结合零方程模型对改进前后该车间的通风状况进行了数值模拟,采用改进前车间实测数据对模型正确性进行验证。对通风改进前后的H2S、NH3质量浓度分布云图观察、关键工位污染物质量浓度值比较以及平均空气龄分析表明,改进后工人活动区域的污染物质量浓度均降至国家标准以下,达到了良好的通风效果。
This paper is aimed at introducing our numerical simula- tion results of the ventilation system of the rubber mixing workshop based on an Airpak. As a matter of fact, the H2S and NH3 concen- tration of an established tire factory is expected to reach 20 mg/m3 and 50 mg/m3, respectively, that is, twice as high as over that stipulated by the national standard, whereas the NH3 concentration level is also over 1.7 times. To improve the ventilation situation of such tire factories and reduce the H2S and NH3 pollution caused by the reactor in its production process, first of all, it is necessary to improve the stack situation of the materials and the ventilation parti- tion function. In this study, we have worked out a new innovated ventilation system, which is featured with the shortest path to the discharged pollutants from the workshop. In so-doing, it can avoid mixing the polluted air. On the basis of the existing research results, we have combined an Airpak software with the zero-equation model to simulate the innovation before and after the workshop ventilation cal- culation. The model can be used to save a large amount of computa- tion results while enabling to ensure very high accuracy. The data measured in the workshop can be used to verify the efficiency of the ventilation before and after the improvement of H2S and NH3 concen- tration. Besides, the model also allows for the comparison between the value of the key pollutant concentrations and the average age of air analysis. The air distribution after the transformation indicates that the model we have developed is effective, intuitive and simplistic in structure, with the maximum concentration level of NH3 being as high as 43.4 mg/m3 in Case 2. Whereas in Case 3, the maximum concen- tration level can reach 27.2 and 22.6 mg/m3. If the concentration level of H2S reaches 19.4 mg/m3 in Case 2, the maximum concen- tration level can be reduced to 9.2 and 8.1 mg/m3 in Case 3. Thus, it can be seen that the above data help to improve the pollutant con- centration of the workers＇ active area and reduces the concentration level below the national standard. Therefore, our innovated model can be thought of as a theoretical basis for improving the ventilation system through heightening the ventilation efficiency.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2012年第6期31-35,共5页
Journal of Safety and Environment
基金
上海高校青年老师培养资助计划项目(yyy11033)
关键词
环境学
工业通风
数值模拟
污染物扩散
environmentalology
industry-ventilate
numerical-simu- late
contamination diffuse
