前言加热炉内燃料燃烧热量被钢料吸收后所剩下的部分,统称为烟气余热。烟气余热包括炉内烟气余热(即炉膛内各项热损失)和炉外烟气余热(即出炉烟气热损失)两部分。为了提高燃料燃烧热在炉内的遗留率,利用炉内烟气余热预热钢料,国外采取了延长炉子预热段的措施,收到了显著的节能效果。 Foreword Furnace fuel combustion heat absorbed by the steel after the remaining part, collectively referred to as flue gas waste heat. Flue gas waste heat, including flue gas waste heat (ie furnace heat loss) and furnace flue gas waste heat (ie flue gas heat loss) in two parts. In order to improve the residual rate of fuel combustion heat in the furnace, preheating the steel by the waste heat of the flue gas in the furnace, the measures taken by the foreign countries to extend the preheating section of the furnace have been adopted and significant energy-saving effects have been received.