In recent years, with the wide application of new technology and new technology, a new type of heating pipe, finned tube, is more and more used in asphalt heating equipment. The application of finned tube can not only greatly improve heating efficiency, but also reduce the investment cost of heating equipment. Single metal finned tube is used as heat exchange element in heat exchanger. It has been in the harsh environment of high temperature and humidity for a long time, so it has the characteristics of high temperature resistance and corrosion resistance. The single metal finned tube of heat exchanger must meet the following characteristics: 1) 防腐性能
1) corrosion resistance
2) wear resistance
3) low contact thermal resistance
4) high stability
5) ability to prevent ash deposition.
Single metal finned tubes used in heat exchangers are usually used in equipment that converts heat power to increase the area of heat. Many devices in our life are used. It is to use high intelligent image design to achieve better protection of the living environment.
Single metal finned tubes for heat exchangers have a high anti-corrosion performance in use; many times, in the normal use of an item, the use of single metal finned tubes for heat exchangers presents unique environmental advantages, adding many additional functions, and improving on the basis of the original facilities. The use of the function has better facilitated the way of using in our daily life. Wear resistance is also the most prominent feature of single metal finned tubes used in heat exchangers. When assembling some parts, wear resistance of single metal finned tubes used in heat exchangers will always help equipment to have a durable use. Some necessary devices are not volatile in use. Heat exchangers are lifted by single metal finned tubes. The real recognition ability of the lifting equipment also better reflects that it has more practical advantages under the protection of the environment.
1、翅片管的优点及材料翅片管由于在管外表面上设翅片而得名。它传热面积比光管可增大2~10倍，传热系数比光管可 提高1~2倍。由于传热能力的增强和单位面积的传热面加大，故与光管比完成同一热负荷可用较少管 数，使设备结构紧凑并使金属消耗量减少。因为翅片的材料可与基管不同，使材料的选择与利用就更加合理。翅片材料根据使用环境和制造 工艺来确定，有碳钢、不锈钢、铝及铝合金、钢及钢合金等。另外，采用翅片管使介质与壁面的平均温差降低，减少结垢，并且在翅片的涨缩作用下，已形成 的硬垢会自行脱落。
1. The advantages of finned tube and its finned tubes are named after fins on the outer surface of the tube. Its heat transfer area can be increased by 2~10 times than that of the light tube, and the heat transfer coefficient can be increased by 1~2 times than that of the light tube. Because of the enhancement of heat transfer capacity and the enlargement of heat transfer surface per unit area, fewer tubes can be used for the same heat load as the optical tube, which makes the equipment compact and reduces metal consumption. Because the material of the fin can be different from the base tube, the choice and utilization of the material are more reasonable. Fin materials are determined according to the use environment and manufacturing process, including carbon steel, stainless steel, aluminium and aluminium alloy, steel and steel alloy, etc. In addition, the average temperature difference between the medium and the wall is reduced by using finned tubes, and the scaling is reduced. Under the action of the expansion and contraction of the fins, the hard scales formed will fall off by themselves.
2、几种常见翅片管的性能评定比较几种翅片管的传热性能，绕片式最差，主要是接触热阻的存在，特别是在运行时，绕片式的 翅片张力随温度的增加而迅速下降，使接触热阻也迅速增加。焊接式传热性能最好。套片式性能次之， 因为翅片紧套于管表面上后再加以表面热镀锌。双金属轧片传热性能类似于镶片式，因为它是在套装 后再轧出翅片。
2. The performance evaluation of several common finned tubes compares the heat transfer performance of several finned tubes. The worst performance of winding finned tubes is the existence of contact thermal resistance. Especially in operation, the fin tension of winding finned tubes decreases rapidly with the increase of temperature, which makes the contact thermal resistance increase rapidly. The heat transfer performance of welding is the best. The performance of the sleeve is second, because the fins are tightly sleeved on the surface of the tube and then are hot-dip galvanized. The heat transfer performance of the bimetal strip is similar to that of the insert, because it is rolled out of the fins after it is fitted.
3、翅片管的分类翅片按其在管子上排列方式，可分纵向和横向(径向)两大类。其他类型都是这两类的变形，例 如大螺旋角翅片管(接近纵向)，而螺纹管(接近横向)等。可根据流体的流动方向及换热特点来选 择。翅片管因制造方法不同而使其在传热性能、机械性能等方面有一定的差异。按制造方法分为整体 翅片、焊接翅片和机械连接翅片等。整体翅片由铸造、机械加工或轧制而成，翅片与管子一体，无接 触热阻，强度高。但要求翅片与管子用同样材料。焊接翅片用钎焊或氩弧焊等工艺制造，可使用与管 子不一样的 材料。由于它的制造简易、经济且具有较好的传热和机械性能，故广为应用。它的主要问 题是焊接工艺质量。机械连接翅片管有绕片式、镶片式及双金属轧片式等。
3. The classified fins of finned tubes can be divided into longitudinal and transverse (radial) fins according to their arrangement on the tubes. Other types are of these two types of deformation, such as large spiral angle finned tube (close to longitudinal), and threaded tube (close to transverse), etc. It can be selected according to the flow direction and heat transfer characteristics of the fluid. Because of different manufacturing methods, finned tubes have certain differences in heat transfer performance and mechanical properties. It is divided into integral fins, welding fins and mechanical connecting fins according to manufacturing methods. The integral fin is made by casting, mechanical processing or rolling. The fin and the tube are integrated. It has no contact thermal resistance and high strength. However, the same material is required for fins and pipes. Welding fins are produced by brazing or argon arc welding. Materials that are different from pipes can be used. Because its manufacturing is simple, economical and has good heat transfer and mechanical properties, it is widely applied. The main problem is the quality of welding process. The mechanical connection finned tube has winding type, insert type and bimetal rolled sheet type.
Single metal finned tubes for heat exchangers have certain ability to prevent ash accumulation. In many concepts, the use of single metal finned tubes for heat exchangers is a kind of mood fusion. It effectively carries a lot of different skills in use, and is also an effective way of use.
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