一、前言为减轻和防止锅炉空气预热器的低温腐蚀,有些机组采用热风再循环提高预热器进口风温的办法来达此目的。进口风温变化后,必然会影响锅炉的排烟温度。在做锅炉鉴定试验或进行大修前后热经济性比较时,都应将进风参数修正到某一基准值,方能加以正确判别。由于有部分热风参与预热器空气系统, I. Preface To mitigate and prevent low-temperature corrosion of boiler air preheaters, some units use hot air recirculation to increase the inlet air temperature of the preheater to achieve this purpose. After the change of imported air temperature, it will inevitably affect the boiler’s exhaust gas temperature. In the boiler identification test or before and after overhaul thermal economy comparison, should be amended to a certain reference value wind parameters, can be correctly identified. As part of the hot air to participate in the preheater air system,