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如何去提高板式换热器传热的技术

编辑:seo来源:未知2019-12-27 11:44
摘要:板式换热器 得怎样去提高传热技术呢?其实只要同时去提高板式冷热两侧的表面的传热系数的,而且得减少污垢层面,抉择热传导率高的版片,再次就是得减少板片的厚度啦,这样才可

      板式换热器得怎样去提高传热技术呢?其实只要同时去提高板式冷热两侧的表面的传热系数的,而且得减少污垢层面,抉择热传导率高的版片,再次就是得减少板片的厚度啦,这样才可以有效的提高板式换热器的传热系数的。
 
  一、提高板片的表面传热系数由于板式板式换热器的波纹能使流体在较小的流速下产生湍流 (雷诺数一 150时 ),因此能获得较高的表面传热系数,表面传热系数与板片波纹的几何结构以及介质的流动状态有关。板片的波形包括人字形、平直形、球形等。经过多年的研究和尝试发现,波纹断面形状为三角形 (正弦形表面传热系数很大,压力降较小,受压时应力分布均匀,但加工困难? )的人字形板片具有较高的表面传热系数,且波纹的夹角越大,板间流道内介质流速越高,表面传热系数越大。
 
  二、减小污垢层热阻减小板式换热器的污垢层热阻的关键是防止板片结垢。板片结垢厚度为 1 mm时,传热系数降低约 10%.因此,必须注意监测板式换热器冷热两侧的水质,防止板片结垢,并防止水中杂物附着在板片上。有些供热单元为防止盗水及钢件腐蚀,在供热介质中添加药剂,因此必须注意水质和黏 剂引起杂物沾污板式换热器板片。如果水中有黏性杂物,应采用专用过滤器进行处理。选用药剂时,宜抉择无黏性的药剂。
 
  三、选用热导率高的板片板片材质可抉择奥氏体不锈钢、钛合金、铜合金等。不锈钢的导热性能好,热导率约 14. 4 W/(m.K) ,强度高,冲压性能好,不易被氧化,价格比钛合金和铜合金低,供热工程中使用很多,但其耐氯离子腐蚀的能力差。

         How to improve the heat transfer technology of plate heat exchanger? In fact, as long as the heat transfer coefficient of the surface on both sides of the plate is improved at the same time, and the dirt layer is reduced, and the plate with high heat conductivity is selected, the thickness of the plate is reduced again, so that the heat transfer coefficient of plate heat exchanger can be effectively improved.

  1、 To improve the surface heat transfer coefficient of plate plate heat exchanger, because the ripple of plate heat exchanger can make the fluid produce turbulence at a small flow rate (Reynolds number 150), so it can obtain a higher surface heat transfer coefficient. The surface heat transfer coefficient is related to the geometry structure of plate ripple and the flow state of medium. The waveforms of the plates include herringbone, straight, spherical, etc. After years of research and experiments, it is found that the herringbone plate with triangular corrugated cross-section (sinusoidal surface heat transfer coefficient is large, pressure drop is small, stress distribution is uniform under pressure, but it is difficult to process?) has a high surface heat transfer coefficient, and the larger the included angle of corrugations, the higher the flow velocity of medium in the channel between plates, the greater the surface heat transfer coefficient.

  2、 The key to reduce the thermal resistance of the fouling layer of the plate heat exchanger is to prevent the fouling of the plate. When the scale thickness of the plate is 1mm, the heat transfer coefficient will be reduced by about 10%. Therefore, it is necessary to monitor the water quality on both sides of the plate heat exchanger to prevent the scaling of the plate and prevent the water impurities from adhering to the plate. In order to prevent water theft and steel corrosion, some heating units add chemicals to the heating medium. Therefore, it is necessary to pay attention to the contamination of plate heat exchanger caused by water quality and viscosity. If there are sticky impurities in the water, special filter shall be used for treatment. When choosing the medicament, it is better to choose the medicament without viscosity.

  3、 Austenitic stainless steel, titanium alloy, copper alloy, etc. can be selected for the plate with high thermal conductivity. Stainless steel has good thermal conductivity, thermal conductivity is about 14.4w / (m.k), high strength, good stamping performance, and is not easy to be oxidized. Its price is lower than that of titanium alloy and copper alloy. It is widely used in heating engineering, but its ability to resist chloride ion corrosion is poor.

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