CN106630986A - 一种回转式空预器用红柱石陶瓷蓄热材料及制备方法 - Google Patents
一种回转式空预器用红柱石陶瓷蓄热材料及制备方法 Download PDFInfo
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Abstract
本发明公开了一种回转式空预器用红柱石陶瓷蓄热材料,包括蜂窝陶瓷蓄热体材料,所述蜂窝陶瓷蓄热体材料包括无机粉料和添加剂,所述添加剂包括有固态粘结剂、润滑剂,有机增塑保湿剂,所述无机粉料按各原料所占重量百分数为:红柱石10~50%、堇青石10~30%、锂辉石10~30%、白刚玉5~10%、钾长石1~10%、高岭土1~10%、焦宝石5~35%。本发明用于冷端耐腐蚀、耐磨性能大大优于金属和搪瓷蓄热材料,此外,本发明的红柱石用陶瓷蓄热材料,主要用于火力发电厂锅炉的回转式空预器装置中,还可用于冶金、石化等加热炉中作为蓄热材料以及废气处理RTO、RCO设备中等,具有环保和节能意义。
Description
技术领域
本发明涉及陶瓷蓄热材料制造技术领域,具体为一种回转式空预器用红柱石陶瓷蓄热材料及制备方法。
背景技术
蜂窝陶瓷是一种结构似蜂窝形状、多孔性的工业陶瓷产品。广泛应用于蓄热式燃烧、催化剂载体、工业烟气处理等,利用蜂窝陶瓷的间壁进行热交换和化学反应。
电力、冶金、石化工等工业中广泛使用的工业锅炉,通过燃烧燃料油或燃料气产生高温烟气,由于燃料、空气中含有的硫、氮等物质,燃烧后产生酸性气体,为了防止烟气中的酸性气体对设备造成腐蚀,工业窑炉排烟温度控制在露点腐蚀温度以上,排烟温度一般在140℃~200℃,热效率通常低于 90%,烟气中部分物理显热被浪费,烟气中的SOX、NOX等有害气体,对大气和环境造成污染。
回转式空气预热器位于锅炉的尾部,常发生腐蚀,腐蚀程度与燃料有关,燃用高硫燃料时较为严重。该腐蚀主要发生在蓄热材料的冷段,严重时可影响到蓄热材料及管子外壳等。因腐蚀发生在温度较低的区域,故通常称为“低温腐蚀”。低温腐蚀 的危害是很大的。它加剧蓄热材料表面粘结飞灰,堵塞部分通道,使流通阻力增大。严重时,冷段蓄热材料大面积粉碎状脱落,影响空气预热器的正常使用,迫使锅炉或其他热力设备停运检修。
采用耐腐蚀的冷段蓄热材料以提高抗酸性水膜的腐蚀,是防止及减缓腐蚀及堵灰的另一重要手段。目前传统的蓄热材料(换热元件)具有以下缺点:
1、传统的蓄热材料一般都是金属材料,在接触酸性强腐蚀烟气介质,导致换热器的腐蚀严重,并且在酸腐蚀的同时还有固体颗粒对换热器的运动冲击,在长期连续使用的情况下很容易破坏。
2、搪瓷换热元件是一种传统钢材防腐工艺,在普通金属材料涂敷一种无机瓷釉,经950℃高温烧制而成的防腐产品,它具有耐腐蚀、耐磨损、宜水冲洗等优点,但是仍存在与金属热膨胀系数不匹配的缺陷,在经过多次冷热交替后易破裂,导致金属与烟气直接接触造成使用寿命短。
3、陶瓷球形蓄热材料易被烟气里的杂质和粉尘污染,由于比表面积小换热效率低。陶瓷球更换时容易破损,装入后如堆放不好的话易堵住通风口,达不到最好的蓄热和释热效果。
发明内容
(一)解决的技术问题
针对现有技术的不足,本发明提供了一种回转式空预器用红柱石陶瓷蓄热材料及制备方法,解决了现有蓄热材料耐磨性能、耐腐蚀性能不高,使用过程中易积灰堵塞、比表面积小换热效率低、使用寿命短等技术问题,且在回转式空预器中,用一种回转式空预器用红柱石陶瓷蓄热材料的红柱石质蜂窝陶瓷蓄热体材料(换热元件)可以代替金属和搪瓷蓄热材料。
(二)技术方案
为实现上述目的,本发明提供如下技术方案:一种回转式空预器用红柱石陶瓷蓄热材料,包括蜂窝陶瓷蓄热体材料,所述蜂窝陶瓷蓄热体材料包括无机粉料和添加剂,所述添加剂包括有固态粘结剂、润滑剂,有机增塑保湿剂。
所述无机粉料按各原料所占重量百分数为:红柱石10~50%、堇青石10~30%、锂辉石10~30%、白刚玉5~10%、钾长石1~10%、高岭土1~10%、焦宝石5~35%。
所述无机粉料的重量以100份计,加入固态粘结剂为3~7份、润滑剂2~6份、有机增塑保湿剂0.5~2%。
一种回转式空预器用红柱石陶瓷蓄热材料的制备方法,包括以下蜂窝陶瓷生产步骤:
S1、制备坯体:将球磨、捏合、陈腐制得的泥料通过挤出机成型,得到蜂窝体坯体;
S2、干燥定型:经过微波炉微波定型后放在热风窑炉干燥定型;
S3、高温烧成:先经过1300~1350℃烧制1~2小时,然后将烧制温度转为800~850℃烧制0.5~1小时,最后经过1600~1650℃烧制1~2小时,得到蜂窝陶瓷蓄热体材料。
优选的,所述无机粉料按各原料所占重量百分数为:红柱石40~42%、堇青石10~11%、锂辉石15~16%、白刚玉9~10%、钾长石8~10%、高岭土8~10%、焦宝石8~10%;无机粉料的重量以100份计,加入固态粘结剂为5~6份、润滑剂3~4份、有机增塑保湿剂1~2%。
优选的,所述固态粘结剂为HPMC、CMC的一种或两种混合物。
优选的,所述润滑剂为有机润滑剂,该有机润滑剂为植物油、硬脂酸的一种或两种混合物。
优选的,所述有机增塑保湿剂为PEO、PVA的一种或两种混合物。
优选的,定型和干燥生产步骤放在热风干燥窑内进行,初始定型温度为65℃,干燥时间为6~12h。
优选的,微波定型中所述微波炉炉的功率为5~10kW,频率为2450MHz±50MHz。
(三)有益效果
本发明提供了一种回转式空预器用红柱石陶瓷蓄热材料及制备方法,具备以下有益效果:
(1)本发明用于冷端耐腐蚀、耐磨性能大大优于金属和搪瓷蓄热材料。
(2)本发明的红柱石用陶瓷蓄热材料,主要用于火力发电厂锅炉的回转式空预器装置中,还可用于冶金、石化等加热炉中作为蓄热材料以及废气处理RTO、RCO设备中等,具有环保和节能意义。
具体实施方式
基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围,下面结合实施例进一步阐明本发明的内容,但本发明的内容不仅仅局限于下面的实施例。
实施例1:
一种回转式空预器用红柱石陶瓷蓄热材料,包括蜂窝陶瓷蓄热体材料,蜂窝陶瓷蓄热体材料包括无机粉料和添加剂,添加剂包括有固态粘结剂、润滑剂,有机增塑保湿剂。
无机粉料按各原料所占重量百分数为:红柱石10%、堇青石15%、锂辉石15%、白刚玉10%、钾长石8%、高岭土10%、焦宝石32%。
无机粉料的重量以100份计,加入固态粘结剂为5份、润滑剂4份、有机增塑保湿剂1%。
其中,固态粘结剂HPMC为3份、CMC为2份。
其中,有机润滑剂植物油为4份。
其中,有机增塑保湿剂PEO为1份。
一种回转式空预器用红柱石陶瓷蓄热材料的制备方法,包括以下蜂窝陶瓷生产步骤:
S1、制备坯体:将球磨、捏合、陈腐制得的泥料通过挤出机成型,得到蜂窝体坯体;
S2、干燥定型:经过微波炉微波定型后放在热风窑炉干燥定型;
S3、高温烧成:先经过1300~1350℃烧制1~2小时,然后将烧制温度转为800~850℃烧制0.5~1小时,最后经过1600~1650℃烧制1~2小时,得到蜂窝陶瓷蓄热体材料。
其中,定型和干燥生产步骤放在热风干燥窑内进行,初始定型温度为65℃,干燥时间为12h。
其中,微波定型中微波炉炉的功率为5kW,频率为2450MHz±50MHz。
经测试,蜂窝陶瓷蓄热体的抗压强度为 26~28MPa、体积密度为2.1~2.2g/cm3、抗硫酸侵蚀率为2.8%,满足回转式空预器用陶瓷蓄热材料的性能要求。本发明的蜂窝陶瓷蓄热体可作为回转式空预器用陶瓷蓄热材料。
实施例2
一种回转式空预器用红柱石陶瓷蓄热材料,包括蜂窝陶瓷蓄热体材料,蜂窝陶瓷蓄热体材料包括无机粉料和添加剂,添加剂包括有固态粘结剂、润滑剂,有机增塑保湿剂。
无机粉料按各原料所占重量百分数为:红柱石25%、堇青石13%、锂辉石15%、白刚玉10%、钾长石8%、高岭土9%、焦宝石20%。
无机粉料的重量以100份计,加入固态粘结剂为5份、润滑剂4份、有机增塑保湿剂1%。
其中,固态粘结剂HPMC为3份、CMC为2份。
其中,有机润滑剂植物油为4份。
其中,有机增塑保湿剂PEO为1份。
一种回转式空预器用红柱石陶瓷蓄热材料的制备方法,包括以下蜂窝陶瓷生产步骤:
S1、制备坯体:将球磨、捏合、陈腐制得的泥料通过挤出机成型,得到蜂窝体坯体;
S2、干燥定型:经过微波炉微波定型后放在热风窑炉干燥定型;
S3、高温烧成:先经过1300~1350℃烧制1~2小时,然后将烧制温度转为800~850℃烧制0.5~1小时,最后经过1600~1650℃烧制1~2小时,得到蜂窝陶瓷蓄热体材料。
其中,定型和干燥生产步骤放在热风干燥窑内进行,初始定型温度为65℃,干燥时间为12h。
其中,微波定型中微波炉炉的功率为5kW,频率为2450MHz±50MHz。
经测试,蜂窝陶瓷蓄热体的抗压强度为 20~23MPa、体积密度为2.1~2.2g/cm3、抗硫酸侵蚀率为3.1%,满足回转式空预器用陶瓷蓄热材料的性能要求。本发明的蜂窝陶瓷蓄热体可作为回转式空预器用陶瓷蓄热材料。
实施例3
一种回转式空预器用红柱石陶瓷蓄热材料,包括蜂窝陶瓷蓄热体材料,蜂窝陶瓷蓄热体材料包括无机粉料和添加剂,添加剂包括有固态粘结剂、润滑剂,有机增塑保湿剂。
无机粉料按各原料所占重量百分数为:红柱石40%、堇青石10%、锂辉石15%、白刚玉10%、钾长石8%、高岭土9%、焦宝石8%。
无机粉料的重量以100份计,加入固态粘结剂为5份、润滑剂4份、有机增塑保湿剂1%。
其中,固态粘结剂HPMC为3份、CMC为2份。
其中,有机润滑剂植物油为4份。
其中,有机增塑保湿剂PEO为1份。
一种回转式空预器用红柱石陶瓷蓄热材料的制备方法,包括以下蜂窝陶瓷生产步骤:
S1、制备坯体:将球磨、捏合、陈腐制得的泥料通过挤出机成型,得到蜂窝体坯体;
S2、干燥定型:经过微波炉微波定型后放在热风窑炉干燥定型;
S3、高温烧成:先经过1300~1350℃烧制1~2小时,然后将烧制温度转为800~850℃烧制0.5~1小时,最后经过1600~1650℃烧制1~2小时,得到蜂窝陶瓷蓄热体材料。
其中,定型和干燥生产步骤放在热风干燥窑内进行,初始定型温度为65℃,干燥时间为12h。
其中,微波定型中微波炉炉的功率为5kW,频率为2450MHz±50MHz。
经测试,蜂窝陶瓷蓄热体的抗压强度为 26~29MPa、体积密度为2.1~2.2g/cm3、抗硫酸侵蚀率为2.8%,满足回转式空预器用陶瓷蓄热材料的性能要求。本发明的蜂窝陶瓷蓄热体可作为回转式空预器用陶瓷蓄热材料。
本发明满足普通规格和薄壁大规格的蜂窝陶瓷蓄热体材料生产使用要求,该方法制备的蜂窝陶瓷具有较低的热膨胀系数和良好抗热冲击性能,该方法制备的蜂窝陶瓷具有较高的机械强度和耐酸腐蚀性能,具有良好的保湿性能,在空气中1小时内无开裂,可以不使用微波设备定型,制造成本相对低廉,泥料的成型性能好,挤出压力小,适合制备薄壁大规格的蜂窝陶瓷蓄热体。
综上,本发明在回转式空预器用蓄热材料(换热元件),陶瓷材料的传热性能虽然略差,而用于冷端耐腐蚀、耐磨性能却大大优于金属和搪瓷蓄热材料。
此外,本发明的红柱石用陶瓷蓄热材料,主要用于火力发电厂锅炉的回转式空预器装置中,还可用于冶金、石化等加热炉中作为蓄热材料以及废气处理RTO、RCO设备中等,具有环保和节能意义。
尽管已经示出和描述了本发明的实施例,对于本领域的普通技术人员而言,可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型,本发明的范围由所附权利要求及其等同物限定。
Claims (8)
1.一种回转式空预器用红柱石陶瓷蓄热材料,包括蜂窝陶瓷蓄热体材料,其特征在于:所述蜂窝陶瓷蓄热体材料包括无机粉料和添加剂,所述添加剂包括有固态粘结剂、润滑剂,有机增塑保湿剂;
所述无机粉料按各原料所占重量百分数为:红柱石10~50%、堇青石10~30%、锂辉石10~30%、白刚玉5~10%、钾长石1~10%、高岭土1~10%、焦宝石5~35%;
所述无机粉料的重量以100份计,加入固态粘结剂为3~7份、润滑剂2~6份、有机增塑保湿剂0.5~2%。
2.根据权利要求1所述的一种回转式空预器用红柱石陶瓷蓄热材料,其特征在于:所述无机粉料按各原料所占重量百分数为:红柱石40~42%、堇青石10~11%、锂辉石15~16%、白刚玉9~10%、钾长石8~10%、高岭土8~10%、焦宝石8~10%;无机粉料的重量以100份计,加入固态粘结剂为5~6份、润滑剂3~4份、有机增塑保湿剂1~2%。
3.根据权利要求1所述的一种回转式空预器用红柱石陶瓷蓄热材料,其特征在于:所述固态粘结剂为HPMC、CMC的一种或两种混合物。
4.根据权利要求1所述的一种回转式空预器用红柱石陶瓷蓄热材料,其特征在于:所述润滑剂为有机润滑剂,该有机润滑剂为植物油、硬脂酸的一种或两种混合物。
5.根据权利要求1所述的一种回转式空预器用红柱石陶瓷蓄热材料,其特征在于:所述有机增塑保湿剂为PEO、PVA的一种或两种混合物。
6.一种回转式空预器用红柱石陶瓷蓄热材料的制备方法,其特征在于:包括以下蜂窝陶瓷生产步骤:
S1、制备坯体:将球磨、捏合、陈腐制得的泥料通过挤出机成型,得到蜂窝体坯体;
S2、干燥定型:经过微波炉微波定型后放在热风窑炉干燥定型;
S3、高温烧成:先经过1300~1350℃烧制1~2小时,然后将烧制温度转为800~850℃烧制0.5~1小时,最后经过1600~1650℃烧制1~2小时,得到蜂窝陶瓷蓄热体材料。
7.根据权利要求5所述的一种回转式空预器用红柱石陶瓷蓄热材料的制备方法,其特征在于:定型和干燥生产步骤放在热风干燥窑内进行,初始定型温度为65℃,干燥时间为6~12h。
8.根据权利要求5所述的一种回转式空预器用红柱石陶瓷蓄热材料的制备方法,其特征在于:微波定型中所述微波炉炉的功率为5~10kW,频率为2450MHz±50MHz。
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CN114349492A (zh) * | 2022-01-28 | 2022-04-15 | 景德镇陶瓷大学 | 一种低温烧成高强度建筑陶瓷坯体及其制备方法 |
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CN114349492A (zh) * | 2022-01-28 | 2022-04-15 | 景德镇陶瓷大学 | 一种低温烧成高强度建筑陶瓷坯体及其制备方法 |
CN114349492B (zh) * | 2022-01-28 | 2022-11-04 | 景德镇陶瓷大学 | 一种低温烧成高强度建筑陶瓷坯体及其制备方法 |
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