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现有沥青砼搅拌设备上采用的烘干筒(下称老式烘干筒)均为单层圆筒状,该筒设计为一端高一端低,工作时定向旋转,燃料从筒的低端处喷入筒内并在筒内燃烧,其尾气从筒的高端处排出;冷料从筒的高端处进入筒内被燃气加热,并向低端处移动,最后从简的低端处排出(见图1)。此工况必然存在两种热损失:一是由于筒身与火焰接触后温度高达600～800℃,筒身四周将散失大量的热;二是由于排出的尾气量大,并且温度高达400℃,故尾气将带走大量的热。上述两种散热将导致燃料消耗量很大。
The existing drying cylinder (hereinafter referred to as the “old-style drying cylinder”) on the existing asphalt concrete mixing equipment is in the form of a single-layer cylinder. The cylinder is designed to be low in one end and oriented in rotation at work. Fuel is sprayed from the lower end of the cylinder Into the cylinder and combustion in the cylinder, the exhaust gas discharged from the high end of the cylinder; cold material from the barrel into the cylinder heated by the gas and move to the low end, and finally discharged from the simple low end (see Figure 1 ). There are two kinds of heat loss in this working condition. First, the temperature of the body is about 600-800 ° C after contact with the flame, and a large amount of heat will be dissipated around the body. Second, due to the large amount of exhaust gas discharged and the temperature up to 400 ° C, So exhaust will take away a lot of heat. Both types of heat dissipation will result in significant fuel consumption.