Theory Analysis And Research On Calculative Method About Overheating Tube Rupture Of Superheater And Reheater In Utility Boiler

For the overheating tube rupture of superheater and reheater in power plant boiler, this dissertation mainly analyzes the causes from deviation of steam side and flue gas side and heat deviation of same panel. Based on the sum-up for previous research, it improves the method of tube wall temperature calculation in some fields and puts forward Subsection-calculating Model. It also deduces and amends Angle Factor and Radiation Factor and Projective Area which used in tube wall temperature calculation and first puts forward a new ways to calculate parameterη, ratio of radiation heat charge of bottom gas aisle to front gas aisle, by means of using Finite Volume Method (FVM) to solve Radiative Heat Transfer Equation (RTE). Combining with project practice, author compiles computer procedure using Visual Basic 6.0 language.Author use the procedure and parameterηto calculate tube wall temperature of superheater or reheater in Dezhou Power Plant No.1 and No.2 and No.3 and No.4 boilers (300MW) and Pingwei Power Plant No.1 boiler (600MW). With the calculative result, we put forward reconstructive plan and already used in Dezhou Power Plant reheaters and successfully solved the problem of overheating tube rupture. The calculative result accord with the actual measure data on the whole. The outcome validates the calculative method and procedure and FVM to calculate parameterηby means of solving Radiative Heat Transfer Equation.