CN116105520B - 一种涂覆有高传热防腐涂层的船舶用换热器及其制备方法 - Google Patents
一种涂覆有高传热防腐涂层的船舶用换热器及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种涂覆有高传热防腐涂层的船舶用换热器,包括换热器,所述换热器的进水腔和出水腔之间由螺旋三叶管连通,所述螺旋三叶管位于冷却腔内部,所述冷却腔内部均匀设置有若干第一折流板和第二折流板,所述第一折流板位于所述冷却腔上方,所述第二折流板位于所述冷却腔下方,所述螺旋三叶管的截面为椭圆弧段和圆弧段依次连接,所述螺旋三叶管内外壁均涂覆有高传热防腐涂层,所述高传热防腐涂层由内至外依次为第一涂层和第二涂层。本发明采用上述结构的一种涂覆有高传热防腐涂层的船舶用换热器,高传热防腐涂层的涂覆可提高螺旋三叶管在海洋环境中的防腐蚀性,形成的超疏水表面对结垢具有抑制和自清洁效果,多壁碳纳米管可强化流体传热。
Description
技术领域
本发明涉及管壳式换热器技术领域,特别是涉及一种涂覆有高传热防腐涂层的船舶用换热器及其制备方法。
背景技术
在船舶工业中,换热器主要用于中央冷却器、淡水冷却器、柴油机冷却器、缸套水冷却器、润滑油和传动油冷却、重燃料油和柴油的预热。换热器的作用是将高温物体的热量传递到低温物体中,从而实现温度的交换来达到制冷制热的目的。其中,管壳式换热器是以封闭在壳体中管束的壁面作为传热面的间壁式换热器,进行换热的冷热两种流体,一种在管内流动,称为管程流体;另一种在管外流动,称为壳程流体。
在海洋大气环境、湿热空气环境等环境中换热器的金属元器件极易被腐蚀。传热管采用外表面轧制翅片的铜管,在海洋环境下会发生电偶腐蚀。而在高温高压或者高酸碱性的环境下工作时,金属材料与换热介质直接接触会造成换热器管束腐蚀严重。据统计表明,换热器的管束腐蚀是导致换热器故障的最常见原因之一。因此,针对换热器管束腐蚀提出防护措施,对于延长设备使用寿命,降低企业维护成本,提高其经济效益具有重要意义。
发明内容
本发明的目的是提供一种涂覆有高传热防腐涂层的船舶用换热器及其制备方法,解决换热器管束腐蚀问题,并提高换热器的换热效率。
为实现上述目的,本发明提供了一种涂覆有高传热防腐涂层的船舶用换热器及其制备方法,包括换热器,所述换热器的进水腔和出水腔之间由螺旋三叶管连通,所述螺旋三叶管位于冷却腔内部,所述冷却腔内部均匀设置有若干第一折流板和第二折流板,所述第一折流板位于所述冷却腔上方,所述第二折流板位于所述冷却腔下方,所述螺旋三叶管的截面为椭圆弧段和圆弧段依次连接,所述螺旋三叶管内外壁均涂覆有高传热防腐涂层,所述高传热防腐涂层由内至外依次为第一涂层和第二涂层。
优选的,所述椭圆弧段和所述圆弧段中,内接圆直径:外接圆直径:圆弧直径为15:21:5,所述椭圆弧段中,长轴:短轴为12.3:11。
优选的,所述螺旋三叶管中,换热段:绝热段为8:1。
优选的,所述第一涂层由双酚A二缩水甘油醚、新戊二醇二缩水甘油醚、聚醚胺、固化剂、乙酸乙酯、纳米SiO2和α-烯基磺酸钠组成。
优选的,所述第二涂层由固化剂、乙酸乙酯、纳米SiO2、多壁碳纳米管、TiO2、环甲基硅氧烷和1H,1H,2H,2H-全氟癸基三乙氧基硅烷组成。
一种涂覆有高传热防腐涂层的船舶用换热器的制备方法:
S1、螺旋三叶管的前处理:将密封处理后的螺旋三叶管放至清洗剂中加热浸泡,浸泡完毕后清水清洗,清洗至无明显清洗剂残留后烘干;
S2、第一涂层的制备:室温下,将双酚A二缩水甘油醚预热后加入新戊二醇二缩水甘油醚、聚醚胺、固化剂和乙酸乙酯磁力搅拌至混合均匀,向得到的混合溶液中加入纳米SiO2、乙酸乙酯和α-烯基磺酸钠后磁力搅拌得到环氧树脂混合液;
S3、第二涂层A组分的制备:将TiO2和纳米SiO2混合后加入乙酸乙酯中超声混合,混合后加入环甲基硅氧烷磁力搅拌,再加入环甲基硅氧烷、固化剂和1H,1H,2H,2H-全氟癸基三乙氧基硅烷,磁力搅拌得到超疏水分散液;
S4、第二涂层B组分的制备:将多壁碳纳米管加入浓硫酸和浓硝酸的混合液中混合均匀,恒温加热搅拌酸化后冷却至室温,使用蒸馏水稀释后过滤,将酸化多壁碳纳米管水洗并真空过滤,直至滤液为中性待用;
S5、第二涂层的制备:将去离子水、B组分、环甲基硅氧烷混合后恒温水浴并搅拌,超声分散后加入A组分中继续超声,得到第二涂层;
S6、喷涂内壁:使用无气喷涂装置对螺旋三叶管内壁依次喷涂第一涂层后70℃下固化,喷涂第二涂层后70℃下固化;
S7、喷涂外壁:使用无气喷涂装置对螺旋三叶管外壁依次喷涂第一涂层后70℃下固化,喷涂第二涂层后70℃下固化。
优选的,S4中浓硫酸和浓硝酸的体积比为3:1。
因此,本发明采用上述结构的一种涂覆有高传热防腐涂层的船舶用换热器及其制备方法,其有益效果为:
1、高传热防腐涂层的涂覆可提高螺旋三叶管在海洋环境中的抗氧化性和防腐蚀性,并达到表面修饰和装饰的目的,多壁碳纳米管强化流体的传热,进一步优化高传热防腐涂层配置过程的同时,给高传热防腐涂层带来更好的传热性能;
2、第二涂层中,添加纳米SiO2可提高第二涂层的硬度和耐磨性能,并保持较高的韧性,纳米SiO2结合TiO2增强了第二涂层的疏水性能,并具备广泛变化的光学性能、优异的电磁性能;
3、螺旋三叶管涂覆高传热防腐涂层后形成超疏水表面,对于螺旋三叶管内的结垢具有抑制功能并具有良好的自清洁功能,所具有的耐介质性能够使它长期在水、油等介质中正常工作;
4、流体在螺旋三叶管内形成螺旋流,产生的涡流及二次流在提升换热器换热效率同时增强流体与壁面的传热,强化了传热过程;
5、使用无气喷嘴技术进行螺旋三叶管内壁高传热防腐涂层的喷涂,增加了螺旋三叶管内壁高传热防腐涂层的均匀性,防止高传热防腐涂层的堆积或者缺料部位的产生,增强换热器整体的使用寿命。
下面通过附图和实施例,对本发明的技术方案做进一步的详细描述。
附图说明
图1是本发明一种涂覆有高传热防腐涂层的船舶用换热器正视剖面图;
图2是本发明一种涂覆有高传热防腐涂层的船舶用换热器螺旋三叶管示意图;
图3是本发明一种涂覆有高传热防腐涂层的船舶用换热器螺旋三叶管侧视剖面图;
图4是本发明一种涂覆有高传热防腐涂层的船舶用换热器螺旋三叶管管内流体流线图。
附图标记
1、换热器;2、螺旋三叶管;3、第一折流板;4、第二折流板。
具体实施方式
以下通过附图和实施例对本发明的技术方案作进一步说明。
除非另外定义,本发明使用的技术术语或者科学术语应当为本发明所属领域内具有一般技能的人士所理解的通常意义。本发明中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性,而只是用来区分不同的组成部分。“包括”或者“包含”等类似的词语意指出现该词前面的元件或者物件涵盖出现在该词后面列举的元件或者物件及其等同,而不排除其他元件或者物件。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接,而是可以包括电性的连接,不管是直接的还是间接的。“上”、“下”、“左”、“右”等仅用于表示相对位置关系,当被描述对象的绝对位置改变后,则该相对位置关系也可能相应地改变。
实施例1
S1、螺旋三叶管的前处理:将密封处理后的螺旋三叶管放至清洗剂中加热浸泡,加热至60℃后浸泡30min,浸泡完毕后清水清洗,清洗至无明显清洗剂残留,自然晾干后烘干。
S2、第一涂层的制备:室温下,将1.7g双酚A二缩水甘油醚预热30min后加入1.08g新戊二醇二缩水甘油醚、2g聚醚胺T-403、1g固化剂和2mL乙酸乙酯磁力搅拌30min至混合均匀,向得到的混合溶液中加入0.06g纳米SiO2、2mL乙酸乙酯和0.03gα-烯基磺酸钠后磁力搅拌得到第一涂层。
S3、第二涂层A组分的制备:将1g TiO2和1g纳米SiO2混合后加入20mL乙酸乙酯中超声混合30min,混合后加入0.5g环甲基硅氧烷磁力搅拌30min,再加入0.1g环甲基硅氧烷、0.01g固化剂和0.1g 1H,1H,2H,2H-全氟癸基三乙氧基硅烷,磁力搅拌60min得到A组分。
S4、第二涂层B组分的制备:将20g多壁碳纳米管加入体积比为3:1的浓硫酸和浓硝酸混合液中混合均匀,恒温60℃加热搅拌酸化2h,冷却至室温,使用蒸馏水稀释后过滤,将酸化多壁碳纳米管水洗并真空过滤,直至滤液为中性,得到B组分待用。
S5、第二涂层的制备:将100mL去离子水、B组分、0.5g环甲基硅氧烷混合后恒温水浴并搅拌5min,超声分散30min,加入A组分中继续超声分散30min,得到第二涂层。
S6、喷涂内壁:使用无气喷涂装置对螺旋三叶管内壁依次喷涂第一涂层后70℃下固化,喷涂第二涂层后70℃下固化4h。
S7、喷涂外壁:使用无气喷涂装置对螺旋三叶管外壁依次喷涂第一涂层后70℃下固化,喷涂第二涂层后70℃下固化4h。
实施例2
换热器1的进水腔和出水腔之间由螺旋三叶管2连通,螺旋三叶管2位于冷却腔内部。冷却腔内部均匀设置有若干第一折流板3和第二折流板4,第一折流板3位于冷却腔上方,第二折流板4位于冷却腔下方。螺旋三叶管2的截面为椭圆弧段和圆弧段依次连接,螺旋三叶管2内外壁均涂覆有高传热防腐涂层,高传热防腐涂层由内至外依次为第一涂层和第二涂层。
得到的第一涂层为形状记忆环氧树脂混合液,第二涂层为多壁碳纳米管/超疏水分散液。
如图3所示,a为椭圆弧段的长轴,b为椭圆弧段的短轴,D1为内接圆直径,D2为外接圆直径,r为圆弧段。椭圆弧段和圆弧段中,内接圆直径:外接圆直径:圆弧直径为15:21:5,椭圆弧段中,长轴:短轴为12.3:11。
螺旋三叶管中,换热段:绝热段为8:1,螺旋三叶管的管长为200mm。
流体进入螺旋三叶管后为螺旋流,在近壁面处产生纵向涡冲刷边界层,边界层厚度减小,流体传热增强。同时,流体在螺旋三叶管内流动的路程增加,流体与螺旋三叶管内壁的换热量增加。
在雷诺数范围50-2000内的流动情况中,相对于普通直管,螺旋三叶管的换热效率提升142%-284%,压降增大了129%-216%。
最后应说明的是:以上实施例仅用以说明本发明的技术方案而非对其进行限制,尽管参照较佳实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对本发明的技术方案进行修改或者等同替换,而这些修改或者等同替换亦不能使修改后的技术方案脱离本发明技术方案的精神和范围。
Claims (5)
1.一种涂覆有高传热防腐涂层的船舶用换热器的制备方法,其特征在于:包括换热器,所述换热器的进水腔和出水腔之间由螺旋三叶管连通,所述螺旋三叶管位于冷却腔内部,所述冷却腔内部均匀设置有若干第一折流板和第二折流板,所述第一折流板位于所述冷却腔上方,所述第二折流板位于所述冷却腔下方,所述螺旋三叶管的截面为椭圆弧段和圆弧段依次连接,所述螺旋三叶管内外壁均涂覆有高传热防腐涂层,所述高传热防腐涂层由内至外依次为第一涂层和第二涂层;
所述椭圆弧段和所述圆弧段中,内接圆直径:外接圆直径:圆弧直径为15:21:5,所述椭圆弧段中,长轴:短轴为12.3:11;
S1、螺旋三叶管的前处理:将密封处理后的螺旋三叶管放至清洗剂中加热浸泡,浸泡完毕后清水清洗,清洗至无明显清洗剂残留后烘干;
S2、第一涂层的制备:室温下,将双酚A二缩水甘油醚预热后加入新戊二醇二缩水甘油醚、聚醚胺、固化剂和乙酸乙酯磁力搅拌至混合均匀,向得到的混合溶液中加入纳米SiO2 、乙酸乙酯和α-烯基磺酸钠后磁力搅拌得到第一涂层;
S3、第二涂层A组分的制备:将TiO2 和纳米SiO2 混合后加入乙酸乙酯中超声混合,混合后加入环甲基硅氧烷磁力搅拌,再加入环甲基硅氧烷、固化剂和1H,1H,2H,2H-全氟癸基三乙氧基硅烷,磁力搅拌得到A组分;
S4、第二涂层B组分的制备:将多壁碳纳米管加入浓硫酸和浓硝酸的混合液中混合均匀,恒温加热搅拌酸化后冷却至室温,使用蒸馏水稀释后过滤,将酸化多壁碳纳米管水洗并真空过滤,直至滤液为中性,得到B组分待用;
S5、第二涂层的制备:将去离子水、B组分、环甲基硅氧烷混合后恒温水浴并搅拌,超声分散后加入A组分中继续超声,得到第二涂层;
S6、喷涂内壁:使用无气喷涂装置对螺旋三叶管内壁依次喷涂第一涂层后70℃下固化,喷涂第二涂层后70℃下固化;
S7、喷涂外壁:使用无气喷涂装置对螺旋三叶管外壁依次喷涂第一涂层后70℃下固化,喷涂第二涂层后70℃下固化。
2.根据权利要求1所述的一种涂覆有高传热防腐涂层的船舶用换热器的制备方法,其特征在于:所述螺旋三叶管中,换热段:绝热段为8:1。
3.根据权利要求1所述的一种涂覆有高传热防腐涂层的船舶用换热器的制备方法,其特征在于:所述第一涂层由双酚A二缩水甘油醚、新戊二醇二缩水甘油醚、聚醚胺、固化剂、乙酸乙酯、纳米SiO2 和α-烯基磺酸钠组成。
4.根据权利要求1所述的一种涂覆有高传热防腐涂层的船舶用换热器的制备方法,其特征在于:所述第二涂层由固化剂、乙酸乙酯、纳米SiO2 、多壁碳纳米管、TiO2 、环甲基硅氧烷和1H,1H,2H,2H-全氟癸基三乙氧基硅烷组成。
5.根据权利要求1所述的一种涂覆有高传热防腐涂层的船舶用换热器的制备方法,其特征在于:S4中浓硫酸和浓硝酸的体积比为3:1。
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