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一、前言加热炉烟气热损失通常占炉子总供热量的1/3～1/2。因此,回收利用烟气余热,是降低炉子燃料消耗最为有效的手段。直接用烟气预热钢料(包括延长炉子预热段和抽出烟气作喷流预热两种方式),热回收效率甚高,但造价较高,且平面布置上有时受限制。喷流预热钢料,同时还带来控制和操作上的复杂化。装设余热锅炉回收烟气余热,热利用率虽高,但无助于加热炉本身热效率和燃烧温度的提高。比较起来,利用烟气余热来预热空气(煤气)是加热炉行之有效的节能
First, the foreword Heating flue gas heat loss usually accounts for the total furnace heat 1/3 ~ 1/2. Therefore, the waste heat recovery and utilization of flue gas is the most effective way to reduce the fuel consumption of the stove. Preheating the steel directly with flue gas (including extending the preheating section of the furnace and extracting the flue gas for jet preheating two ways), the heat recovery efficiency is very high, but the cost is higher, and the layout is sometimes limited. Jet preheat the steel, while also bringing control and operational complications. The installation of waste heat boiler waste heat recovery flue gas, although the high utilization rate of heat, but does not help the heating furnace itself, thermal efficiency and combustion temperature increase. In comparison, the use of waste heat from flue gas to preheat air (gas) is an effective energy saving in furnaces