空气预热器也被称为空预器。目前，主要应用于燃煤电站锅炉。由于其备受市场的欢迎，因此各式各样的产品也相继涌入市场。
Air preheater is also called air preheater.. At present, mainly used in coal power station boiler. Because of its popularity, so a wide variety of products have been poured into the market.
在上，空气预热器主要可以分为管箱式、回转式两种。我们首先介绍管箱式，其工作原理为：通过烟气从管箱外部流经，同时空气从管箱内部通过，通过两个方向温差不同进行传热，相对来说，原理较为简单。对于回转式预热器，可以分为风罩回转式和受热面回转式两种。其工作原理相对来说较为复杂，对于回转式，整个预热器转子部件主要由许许多多的传热元件组成，通过空预器缓慢旋转，烟气和空气逆向交替流经空气预热器实现预热。其预热过程与蓄热元件也是分不开的，它可以在烟气侧吸热，在空气侧放热，这一过程可以实现降低锅炉排烟温度的目的，还可以提高热风温度的预热作用。
In the domestic market, the air preheater can be divided into two kinds of box type, rotary type. We first introduce the tube box, its working principle is through the flue gas from the outside of the pipe box flows through, and air from the tube through the inside of the box, by two temperature difference in the direction of heat transfer, relatively speaking, the principle is relatively simple. The air preheater, can be divided into hood rotary and rotary heating surface two. Its working principle is relatively is more complex, for rotary, the preheater rotor parts mainly by Xu many heat transfer element composition, through the air preheater slowly rotating, the flue gas and air reverse alternately flowing through the air preheater for preheating. The preheating process and heat storage element is inseparable, it can in the flue gas side heat and in the air side heat transfer and the process can reduce the flue gas temperature of boiler, but also can improve the temperature of hot air preheating effect.
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