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从工艺高温加热炉的排气中回收余热之所以至今未能取得成效,其原因主要是受了材质的限制。鉴于高温下的材质强度可能下降,尽管某些场合预热空气的能力可达到1000°K(727℃),但对用高温钢和特级合金制成的余热回收器来说,仍应限制在900°K(627℃)的范围内。虽然用耐热材料可以提高其受限制的温度范围,但这既不耐腐蚀,投资费用又高。若用陶瓷来制作余热回收器,则又总是发生很高的程间泄漏,以致引起效率的严重下降。这是由于在温度梯度及热膨胀差的作用下,许多陶瓷连接处的缝口都发生了泄漏的缘故。但是,用陶瓷热管来制作余热回收器,就可以减少热膨胀的问题,因为每一个热管
The reason why waste heat is recovered from the exhaust of the high-temperature furnace of the process has so far failed to be achieved is mainly due to material restrictions. In view of the possible degradation of the material strength at high temperatures, although the ability to preheat the air may reach 1000 ° K (727 ° C) in some cases, the heat recovery with high temperature steels and premium alloys should still be limited to 900 ° K (627 ° C). Although the use of heat-resistant materials can increase its temperature range, but it is neither corrosion-resistant, high investment costs. If ceramics are used to make waste heat recovery devices, there is always a high leakage between processes, causing a serious drop in efficiency. This is due to the temperature gradient and the difference in thermal expansion, many ceramic joints have occurred in the leakage occurred. However, the ceramic heat pipe to make waste heat recovery, you can reduce the problem of thermal expansion, because each heat pipe