Research On The Optimization Of Slagging Prevention Of 330MW Boiler Burning Shenhua Coal

In recent years,the slagging problem of coal-fired boilers has always affected the safety and economy of boiler operation,and caused many problems.It will not only affect the normal operation of the boiler unit,but also force the boiler to stop due to slag removal,which will cause huge economic losses to the power plant.Therefore,we must pay attention to boiler slagging and take active and effective measures to avoid this problem.In this thesis,the serious slagging problem occurred in the process of blending high-proportion low-ash melting point Shenhua coal in the No.2 boiler of a 330 MW unit of a power plant was taken as the research object,and a method for alleviating the slagging of the boiler was found.First,the thesis refers to related literature at home and abroad,analyzes the mechanism of coal-fired boiler slagging and the factors that affect slagging,puts forward a method for predicting coal slagging,and uses a variety of methods to predict slagging.A detailed study was carried out to conclude that Shenhua Coal has the characteristics of serious slagging tendency.Then,combined with the basic situation of the No.2 boiler equipment of the power plant,and from the aspects of coal type used,boiler design characteristics,combustion system,primary and secondary air jets,soot blowing system,furnace atmosphere,flue gas residual rotation,etc.,the current boiler slagging problem is theoretically analyzed and studied,and the simulation software Fluent is used to numerically simulate the adjustment of the tangent circle of No.2 boiler,and the size of the tangent circle transformation is determined.The system was changed to a combustion system modification program designed for the first and second air tangential "wind pack powder",which is commonly used to burn slagging coal,reasonably increase the number of soot blowers in the furnace and strengthen the soot blowing system.Also,the cold aerodynamic field test research was carried out on the modified No.2 boiler to fully understand the aerodynamic status of the furnace in the cold state,and then reflected the operation status of the boiler in the hot state.On the whole,the experimental research results are ideal,which proves the modification plan is correct.Finally,after the transformation of No.2 boiler,the hot combustion adjustment and the Shenhua coalblending test study were carried out.The research results show that the boiler after the transformation and adjustment has good adaptability to the high proportion of Shenhua coal blending,and the boiler slagging is alleviated.The boiler efficiency has basically reached the designed level,the expected goals have been reached,and the best soot-blowing plan and operation optimization suggestions have been put forward to ensure the safety,environmental protection and economy of the unit.In this thesis,through the research on the anti-slagging of the boiler blended with Shenhua coal,many experiences and conclusions have been obtained from the reformation of the tangential circle reformation of the boiler burner and the reformation of the soot-blowing system,which will provide reference for similar boiler reformations.