基于图像处理的换热器换热铜管尺寸测量研究

针对换热器换热铜管直径非接触及自动测量问题,提出了一种基于图像处理的测量方法.首先利用CCD相机采集换热铜管图像,然后通过灰度化、滤波去噪、二值化及数学形态学处理等方法对图像预处理;接着采用Canny边缘检测算子绘制边界轮廓,并获得换热铜管直径像素尺寸;最后结合相机标定法将换热铜管像素尺寸换算为实际物理尺寸.将该测量结果与游标卡尺测量结果对比,计算得到误差为1.6%,提高了测量精度.

换热铜管泄漏原因分析

某换热铜管使用2年后发生泄漏,采用化学成分分析、微观形貌分析、能谱分析、金相分析及硬度检测方法对铜管进行泄漏原因分析。结果表明:换热铜管发生蚁巢腐蚀,导致换热铜管早期穿孔泄漏。

高效换热铜管的质量控制

对高效换热铜管的加工方式进行了分类,并详细讨论了冷加工成型高效换热铜管的质量要求,以及在生产过程中须抓好管坯质量、工装模具的控制、润滑剂的选用和生产操作的规范化等几个方面。

循环冷却水系统中铜管换热设备腐蚀的防止

提出了几种循环冷却水系统中铜管换热设备腐蚀的防止方法 ,并通过实际综合应用 ,取得较为理想的防腐效果 ,腐蚀率为 0 .0 0 2 8mm/a ,远低于控制标准 0 .0 0 5mm/

冷水机组(风冷热泵)换热器换热铜管设计选用材料的研究

本文针对冷水机组(风冷热泵)换热器的换热铜管常用的T2、TP2材料的选用进行了比对论证。

纯铜管式换热器电镀镍工艺

对铜换热器表面电镀镍,镀液配方和工艺条件为:六水合氯化镍200 g/L,硼酸40 g/L,糖精3 g/L,十二烷基硫酸钠0.1 g/L,pH 4~5,温度(60±5)℃,电流密度1.5 A/dm^(2),时间20~50 min。所得的镍镀层呈光亮的银白色,电镀50 min时厚度为9.30μm,显微硬度为149 HV,结合力和高温抗氧化性优良。

5mm管径铜管换热器在商用空调机组上的应用研究

基于一台15 kW的商用空调机组,原机的室内、外换热器均采用9.52 mm管径铜管,对其进行替代设计,采用5 mm管径铜管室内、外换热器。在对5 mm管径换热器的优化过程中发现:翅片间距、翅片片型、流路设计、分液器毛细管长度均对换热量、能效、除霜效果有较大的影响。对比优化后的5 mm管径换热器和原机换热器的性能、成本、制冷剂充注量发现:5 mm管径换热器的额定制冷能力提高3.47%,能效比提高7.86%,额定制热能力和性能系数与原机相当,除霜周期较原机增加25.1 min;室外换热器成本降低约10%;室内换热器成本降低约20%;制冷剂充注量减少46%。

镀锌边板对铜管换热器腐蚀影响机制研究

目前市场上用量最大的铜管换热器,多使用镀锌边板作为右支撑,镀锌边板的腐蚀电位较低,可以与铜管耦接,对铜管起到保护作用。然而,对市场上回收样机进行分析发现,约43%的换热器在镀锌边板附近发生泄漏。通过对不同运行周期的换热器进行分析发现,在使用初期,镀锌边板对铜管可起到保护作用,随着使用时间延长,保护作用逐渐降低,镀锌层被消耗以后,铁基体开始被腐蚀出现铁离子,这会加速铜管的腐蚀。

Ammonia corrosion analysis of copper tubes and experimental research on non-copper improvement for heat exchanger in power plant

Ammonia corrosion in copper tube will affect the safety of boiler running in power plant. Therefore, no copper in heating system has become a technical orientation in heat exchanger reconstruction, This paper analyzes the condition and mechanism of ammonia corrosion occurring in copper tube used in coal-fired power plants. Using a general steam condensation testing equipment only for horizontal single tube, with water vapor and water as working fluid, on two types of steel tube with 2-side enhancement heat transfer, namely, a spirally fluted tube and a ratchet tube with internal spiral groove （RISG tube） which was developed recently, a set of experimental tests are conducted to investigate the characteristics of heat transfer and hydromeehanics. In order to compare easily, both one copper smooth tube and one steel smooth tube are also used in the experiment. The experimental results, which get from single horizontal tube, show that the overall heat transfer coefficient of steel spirally fluted tube are improved by 10%o to 17%, and that of the steel RISG tube（22%-28%） is better than steel spirally fluted tube, its flow resistance coefficient is only increased by 22% to 66% when compared with smooth tube. Based on a lot of experimental data, the steel spirally fluted tube and the steel RISG tube were applied in a low pressure preheater and an oil-cooler of some or other power plant respectively. The field testing results showed that their heat transfer coefficient with each types of enhancement heat transfer tubes were improved by 2.5% and 21%-45% comparing with copper smooth tube heat exchangers. Both basic and field experiment indicates that the steel tube with 2-side enhancement heat transfer is an ideal choice for heat exchanger reconstruction in no copper issue in power plants.