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热风冲天炉的密筋炉胆为避免其内外圆筒纵向膨胀量不同而造成开裂,在炉胆上都焊有图示的的膨胀补偿器，通常它是用厚2mm的A3钢板
In order to avoid cracking caused by the different longitudinal expansion of the inner and outer cylinders, a bulge compensator is welded on the furnace. Usually it is made of A3 steel plate with a thickness of 2mm