合成氨生产中,合成塔入塔气体的氢氮比是工艺上一个极为重要的控制指标。当入塔气体中的惰性气体氩与甲烷成分之和通过一定的调节手段基本稳定时,则氢氮比的控制就成了对氢成分或氮成分按计算指标进行控制了。鉴于热导式氢分析仪经济可靠,因而国内大多数中、小型合成氨厂都把根据氢指标调节合成塔入塔气 In the production of ammonia, the hydrogen to nitrogen ratio of the gas entering the synthesis tower is an extremely important control index in the process. When the sum of argon and methane components of the inert gas in the inlet gas is basically stable by a certain regulating means, the control of the hydrogen to nitrogen ratio becomes the control of the hydrogen component or the nitrogen component according to the calculated index. In view of the economical and reliable thermal conductivity hydrogen analyzer, most domestic small and medium-sized ammonia plants adjust the synthesis tower towering gas according to the hydrogen index