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在许多加热过程中,大部分热量散失于炉外或被废气带走。预热助燃空气常常是回收这部分热量的最有效办法。空气预热温度与节约燃料的关系如图10-1。图10-1表明,对一定的空气预热温度来说,炉气温度越高,这时达到所需要的预热温度也更容易。同时,预热空气可以提高火焰温度。例如,空气预热600℃,天燃气火焰温度可提高220℃左右,
In many heating processes, most of the heat is lost to the outside of the furnace or taken away by the exhaust gas. Preheating combustion air is often the most efficient way to recover this part of the heat. The relationship between air preheating temperature and fuel economy is shown in Figure 10-1. Figure 10-1 shows that for a given air preheat temperature, the higher the oven temperature, the easier it is to reach the desired preheat temperature. At the same time, preheating the air increases the flame temperature. For example, air preheat 600 ℃, natural gas flame temperature can be increased by about 220 ℃,