最近有许多文章(参考文献[1]、[2]、[3]、[4])介绍日本林太郎提出的计算局部排风罩排风量的新方法——流量比法,这个方法有一些新的概念,考虑的因素比较全面。目前已引起许多人的注意和重视。我们学习后,感到全面分析各种计算方法,是个重要问题,它能帮助我们避免盲目性和片面性。这些就是本文要讨论的目的。局部排风罩排风量的计算与工艺过程、工艺设备布置、排风罩位置等因素,都有密切关系。根据工艺过程散热量的不同,可分 Recently, there are many articles (references [1], [2], [3], [4]) introducing the new method of calculating the exhaust volume of local exhaust hoods proposed by Lin Tailang of Japan - the flow ratio method. This method has some new The concept is more comprehensive considering the factors. At present, it has attracted the attention and attention of many people. After we study, we feel that a comprehensive analysis of various calculation methods is an important issue. It can help us avoid blindness and one-sidedness. These are the purposes of this article. The calculation of the exhaust volume of the local exhaust hood is closely related to the factors such as the technological process, the layout of the process equipment, and the location of the exhaust hood. According to the difference in heat dissipation during the process, it can be divided