An Algebraic Thermal Calculation Method and Its Application to Determine Heat-Insulating Refractory on Furnace Waterwall of a Pulverized-coal Fired Boiler
In order to solve the design problem theoretically, a criterion, based on the refractory’s flame-side surface temperature which is required to be lower than that of coal ash deformation, is proposed and thereby, an algebraic calculation model, which correlates the flame-side temperature with a boiler’s load and the area, the thickness and thermal conductivity, is established and, the following is concluded: the flame ① -side surface temperature increases promptly with increase of boiler’s load and there is approximately a linear relationship between the load and the surface temperature; the flame ② -side surface temperature varies in the feature of a log function with thickness of the refractory; ③the flame-side surface temperature increases promptly with decrease of the thermal conductivity and increases slowly with increase of the area. Finally, A calculation for designing the heat-insulation refractory is exemplified according to the criterion and model for a 400t/h boiler firing anthracite with DT=1200℃, the calculated area is about 50m2 for a refractory with thermal conductivity 12W/ (m·K) and thickness 60mm, and that is consistent well with the actual situations of most 400t/h PC fired boilers domestically.
Algebraic method Combustion Coal-fired boiler Heat-insulating refractory
Yanfei CHEN Donglin CHEN
School of Energy and Power Engineering, Changsha University of Science and Technology, Changsha, 410076, China
国际会议
2007杭州国际动力工程会议(The International Conference on Power Engineering 2007)
杭州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）