液化气混空气燃气与天然气的互换性

燃气互换性问题存在于城市燃气供应的始终，在供气气源的性质发生较大变化时问题尤为突出。在液化气混空气为主要气源的城市燃气供气系统中，将来引进天然气时，所遇到的问题中最重要的就是液化气混空气燃气与天然气之间的互换性问题。作者采用美国燃气协会(A．G．A．)互换性判定方法，对这两种燃气的互换性进行了判定分析，并根据燃气用具的运行特性，分析了以液化气混空气燃气作为基准气设计和进行初调整的燃气用具，使用天然气后可能出现的问题。为将来天然气能顺利地与液化气混空气置换提出了合适的液化气混空气比例。

Interchangeability between LPG-air Mixture Gas and Natural Gas

Interchangeability of gas runs through city gas supply, especially when characters of gas source changegreatly. In the city gas distribution system whose main gas source is LPG-air mixture gas, the most importantproblem is the interchangeability between LPG-air mixture and natural gas when natural gas will be used widelyin the future. The author selects the method of A. G. A.(American Gas association) and analyses theinterchangeability of the two kinds of gases. In addition, based on the operating property of gas appliances, theauthor analyses what kinds of problems will arise when the gas appliances use natural gas, which are designed andadjusted primarily on the base of LPG-air mixture gas. Then the author gets the reasonable mixture ratio ofLPG-air mixture gas, which ensures the successful replacement between LPG-air mixture gas and natural gas.