| FSSS (Furnace Safety Supervisory System) based on the Flame detection technology is widely applied in both domestic and international power stations. However, there exist certain problems to be resolved, and especially, each time the flame detector is replaced, flame detection assemblies need to be relocated, reconfigured and reprogrammed at 40 meter level high inside the furnace, and flame detection system has to be retrained and commissioned locally. Therefore, such manual operation fully relies on operators, and automatic ignition can not be achieved. Hence, loss of full furnace flame protection can not be put into service within full load range. The main difficulty of furnace safety detection is the accuracy of flame detection.During normal operation, traditional flame detection system, which was used in previous FSSS, can not eliminate the impact of occasional positive pressure combustion. The flame detection equipment will be affected each time the boiler is under maintenance, and the system might not be able to detect flame accurately, then it will cause FSSS to operate unstably. Subject to so many factors, it often causes a series of production technique problems when the operator ignites. If ignored by operators, it may cause the unit to shut down.In this paper, current power station process control research status and the application significance of communication technology in power station is analyzed. Aimed at above problems, research on FSSS system is conducted using flame detection technology and remote communication technology. General communication technology used in modern power station control system is introduced and analyzed, and it provides technical support for the realization of remote communication in flame detection system. The possibility to combine flame detection technology and communication technology is also analyzed, and an improving FSSS proposal combining both flame detection technology and communication technology is raised. With fully utilized DCS data and equipment resource, new control philosophy is implemented in the configuration, and with the improved system, the requirements to boiler safety supervision can be satisfied.Final site commission is made, and test result is in accordance with initialdesign, and with real time operation techniques improved, the system reaches optimum control result. It resolves a series of problems caused by the flame detection system's incapability to detect flame, and it ensures power station boiler long term operation at safest and most economy condition. Abnormal extinguish is effectively prevented, and hence eliminated turbine generator unit trip accidents. Meanwhile, the enormous detection cable system in previous DCS is fully simplified in the improved system, effective data process, curve observation and trend analysis provide extremely useful comprehensive guidance for real time operation, and the simplification in maintenance also help to improve equipment reliability.Normal operation of the system provides warranty for the technical innovation in similar power stations. |
