Study On Risk-based Inspection Method For Waste Incinerator Power Boilers

With the implementation of environmental protection policies and rapid development of city infrastructures,waste power generation has been developed rapidly owing to its social and economic benefits.The parameters and medium temperature of waste incinerator power boilers are relatively high.In the combustion process,corrosive gas and fly ash are produced,which may lead to serious consequences to the waste incinerator power boiler and the surrounding environment once an accident happens.While,the inspection of the waste incinerator power boiler,is a key technical link to ensure its safety.Risk-based inspection is a risk assessment and management process which takes the failure of the equipment for object,and the inspection of the equipment as main means.The risk of the equipments can be determined through analysis of likelihood and consequence of failure.According to risk level of the equipments,inspection plan can be made.The inspection and maintenance of the waste incinerator power boiler are focus on high-risk equipments,which is helpful to extend the inspection period and improve the efficiency of inspection.Risk-based inspection is widely used in various fields throughout the world.However,so far as situation at present,there is still much more work needed to do in the application of risk-based inspection on waste incinerator power boilers.In this dissertation,RBI technology and its developments at home and abroad are first introduced,then the implementation flow of RBI technology and discusses the problems existing in the application of RBI standards and softwares in petrochemical field on waste incinerator power boilers are explained.Aiming at these problems,this dissertation propose building a risk assessment model by using fuzzy mathematic language to describe likelihood and consequence of failure of the components of the waste incinerator power boilers.Combined with the common failure conditions obtained during inspections,the failure modes of the components of waste incinerator power boilers are sorted out and analyzed.High temperature corrosion of waste incinerator power boiler is deeply researched through experimental methods.It has been found experimentally that the sticky surface of the deposit could trap fine particles,which will promote deposits growth.The key factor in government debt risk control is information.Chlorine is the key factor in high temperature corrosion.In addition,the temperature of tubes and flue gas,and materials of the tubes,also have appreciable effects on high temperature corrosion.These researches provide evidence for the establishment of risk assessment system of components of the waste incinerator power boilers.A risk assessment software of the components of waste incinerator power boilers is worked out in Visual Basic language,and is applied to a waste incinerator power boiler with a certain type of SLC225-3.82/400.The assessment results basically tallies with on-site inspection results of the waste incinerator power boiler.The inspection plan was developed based on the risk assessment results,so as to realize risk-based inspection for waste incinerator power boilers.By adopting this inspection technology,risk of the components of the waste incinerator power boilers will be efficiently reduced,inspection efficiency will be decreased,the inspection period will be extended,and more safety and reliability is to be got.