本文根据FISHER公司提供的资为编译而成。这套控制系统用在南京芳烃联合装置的油罐氮封系统。本系统的特点:反应灵敏、耗氮气量小、低压、系统组成简单。在液体贮罐和过程贮罐上使用气封控制的系统曾经探索了很多年,对这样的系统有如下几点要求: (a)为了保护贮罐,当压力突然波动时,该系统能迅速响应; (b)因为这种系统大量的用在像1/2时水柱这样的低压气封系统,所以要求该系统在 This article is compiled according to the funding provided by FISHER. This control system used in Nanjing aromatics tank nitrogen seal system. The system features: responsive, low nitrogen consumption, low pressure, the system is simple. Systems that use gas-sealed controls on liquid and process tanks have been explored for many years and have the following requirements for such systems: (a) In order to protect the tank, the system responds promptly when pressure suddenly fluctuates ; (b) Because of the large number of such systems used in low pressure gas sealing systems such as 1/2 hour water columns, the system is required