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1受热面过热的宏观表象、内在变化和危害有机热载体锅炉受热面主要是管子,分辐射段(盘管或门形管)和对流段(蛇形管)。过热后的宏观表象有变形、胀粗、鼓包、爆管、严重时表面出现氧化层,切割管子后内壁的表象有油垢、油的裂解产物。由于裂解过程中的产物具有还原性,管子内壁一般没有氧化层,除非产生爆管、油位不足等原因而使管内进入了空气或水。受热面过热后的内在变化包括材料的组织变化、力学性能变化和物质的量的变化。后者伴有
1 Heating surface overheating macroscopic appearance, internal changes and hazards organic heat carrier Boiler heating surface is mainly pipe, sub-radiation section (coil or gate pipe) and convection section (serpentine). After the overheating macroscopic appearance of deformation, swelling, bulging, burst tube, serious surface oxide layer, the wall after the cut tube appearance of grease, oil cracking products. As the product of the cracking process is reducible, the inner wall of the pipe generally has no oxide layer, unless there is a squib, insufficient oil level and the like, the air in the pipe or water enters the pipe. Inner heating surface overheating, including changes in the organization of the material, changes in mechanical properties and the amount of material changes. The latter is accompanied by