Under the condition that the dry gas seal is designed correctly according to the operating conditions, its operation mainly depends on the normal matching between the two end faces of the seal, that is, the moving ring and the static ring. If the gas entering the seal cavity is mixed with small impurities, it will seriously affect the reliability and service life of the whole dry gas seal system. Therefore, in order to ensure its safe operation, a seal gas filtration unit must be provided. The amount of seal leakage marks whether the dry gas seal works normally. Therefore, a set of leakage monitoring unit is needed to monitor the leakage to judge whether the dry gas seal is working normally. When the leakage of dry gas seal exceeds a certain value, the monitoring system thinks that the seal has failed, and the system sends out alarm signal, even interlock shutdown, to ensure the safe operation of the unit. In addition, in order to prevent the dry gas seal from being affected by the lubricating oil, it is necessary to match the seal gas isolation unit to prevent the bearing lubricating oil from entering the dry gas seal system. To sum up, the dry gas seal control system (also known as "support system") consists of three parts: seal gas filter unit, dry gas seal leakage control unit and seal isolation gas unit. It controls and monitors the gas in the sealing system from the aspects of flow, pressure, temperature and cleanliness. However, due to the different sealing structure layout, sealing medium type, pressure and temperature, the specific structure of dry gas seal control system is also different.
