CN107352981B - 一种cfb锅炉回料器用刚玉-莫来石低导热高强耐磨浇注料 - Google Patents
一种cfb锅炉回料器用刚玉-莫来石低导热高强耐磨浇注料 Download PDFInfo
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Abstract
本发明涉及一种CFB锅炉回料器用刚玉‑莫来石低导热高强耐磨浇注料,属于无机非金属材料学科耐火材料领域。主要原料有废旧高铝电瓷、刚玉、立方氮化硼、碳化钛。以废旧高铝电瓷和刚玉为骨料、立方氮化硼细粉和碳化钛为细粉,加入氧化铝空心球以降低热导率,以ρ‑Al2O3为结合剂,经强力搅拌均匀后包装制得。本发明的浇注料生产成本低、强度高、耐磨性能好、热导率低,在CFB锅炉回料器中使用寿命长,且有利于回料器保温节能。
Description
技术领域
本发明涉及一种CFB锅炉回料器用刚玉-莫来石低导热高强耐磨浇注料,属于无机非金属材料学科耐火材料领域。
背景技术
CFB锅炉因其具有燃料适应性广、燃烧效率高、负荷调节大、可在床内直接脱硫及实现低NOx排放、燃料制备系统简单、易于实现灰渣综合利用等众多优点,在生产用汽、供热、热电联产、电站锅炉中被广泛采用。CFB锅炉回料器回料通道都是一个U型体,炉内的颗粒处于强流化状态,回料器内有高温物料的强烈冲刷,是直接关系到锅炉燃烧、过热汽温和负荷的重要部件,也是经常容易磨损和毁坏的部位。另外,目前采用的矾土高铝质耐磨浇注料的导热系数偏高(2~4 W·m-1·K-1),热量散失严重,不利于节能。因此,开发强度高、耐磨性能好、低导热的功能型新材料是解决CFB锅炉回料器寿命短,散热大不节能的重要方法之一。
发明内容
本发明公开了一种CFB锅炉回料器用刚玉-莫来石低导热高强耐磨浇注料,其主要原料有废旧高铝电瓷、板状刚玉、立方氮化硼、碳化钛、ρ-Al2O3,以质量百分比表示,具体配方为:
粒度7~1mm的废旧高铝电瓷 26~50%
粒度3~1 mm的废旧高铝电瓷 5~20%
粒度1~0.088 mm的刚玉 5~18%
立方氮化硼粉 4~9%
碳化钛粉 4~6%
氧化铝空心球 12~20%
ρ-Al2O3 5~18%
在以上原料基础上,外加烯丙基聚氧乙烯醚基马来酸酐作为减水剂;进一步,所述外加烯丙基聚氧乙烯醚基马来酸酐的添加量为0.1~0.15%;
所述立方氮化硼粉的粒度≤0.044mm;所述碳化钛的粒度≤0.044mm;所述氧化铝空心球的球径≤0.5mm。
制备方法:以上原料经强力混碾均匀,制备成CFB锅炉回料器用低导热高强耐磨浇注料,用塑料袋防潮包装。
施工和养护:施工时加水量3~3.5%。浇注施工完毕养护72小时后拆模,自然干燥72小时,在100-120℃烘烤48小时,然后以不超过20℃/小时缓慢升温至工作温度。
废旧高铝电瓷和刚玉为骨料,废旧高铝电瓷主晶相为刚玉和莫来石,因其为经烧结过后的材料,结构稳定、体积稳定、强度高、耐磨性能好,应用废旧高铝电瓷既能达到CFB锅炉回料器要求耐磨的性能要求,且废旧高铝电瓷又属于废旧材料的循环利用,具有成本非常低廉。骨料废旧高铝电瓷、刚玉和细粉立方氮化硼、碳化钛均为高强耐磨材料,有这些高强耐磨材料组成的复合材料具有高强耐磨的特性。立方氮化硼和碳化钛为细粉均属于人工合成的耐磨性能,即使在长期高温使用时,产生少量的氧化,会促进基质和骨料的烧结,使得基质和骨料更加致密结合,整体的耐磨性能会提高,且致密的结构阻断了进一步的氧化发生。加入氧化铝空心球(球径≤0.5mm)具有耐磨的特性,且因为封闭的气孔结构降低了复合材料的热导率。以ρ-Al2O3为结合剂,ρ-Al2O3在常温下能发生水化形成凝胶,形成低温施工强度,在高温下的转化成刚玉,并和废旧高铝电瓷烧结融为一体,获得高温工作强度。
本发明的优点采用的原料有很大组成为废旧材料,成本低。制备的低导热高强耐磨浇注料,强度高、耐磨性能好、热导率低,使用在CFB锅炉回料器中寿命长,隔热效果好,利于节能。
具体实施方式
实施例1
按照重量百分比,选取粒度1~7mm的废旧高铝电瓷 50%、粒度1~3mm的废旧高铝电瓷5%、粒度0.088~1 mm的刚玉12%、粒度≤0.044mm立方氮化硼粉4%、粒度≤0.044mm的碳化钛粉4%、球径≤0.5mm的氧化铝空心球20%、ρ-Al2O35%、烯丙基聚氧乙烯醚基马来酸酐0.1%,将以上原料经强力混碾均匀,制备成CFB锅炉回料器用低导热高强耐磨浇注料,用塑料袋防潮包装。施工时加水量3%,浇注施工完毕养护72小时后拆模,再自然干燥72小时,在120℃烘烤48小时,然后以不超过20℃/小时缓慢升温至工作温度。1490℃×3h煅烧后的性能,常温耐压强度88MPa、永久线变化率-0.15%、25℃×24h耐磨性4.7cm3、25℃导热系数1.30W•m-1•K-1、600℃导热系数1.23W•m-1•K-1、1100℃导热系数1.02W•m-1•K-1。
实施例2
按照重量百分比,选取粒度1~7mm的废旧高铝电瓷 42%、粒度1~3mm的废旧高铝电瓷9%、粒度0.088~1 mm的刚玉15%、粒度≤0.044mm立方氮化硼粉5%、粒度≤0.044mm的碳化钛粉4%、球径≤0.5mm的氧化铝空心球16%、ρ-Al2O3 9%、烯丙基聚氧乙烯醚基马来酸酐0.1%,将以上原料经强力混碾均匀,制备成CFB锅炉回料器用低导热高强耐磨浇注料,用塑料袋防潮包装。施工时加水量3%,浇注施工完毕养护72小时后拆模,再自然干燥72小时,在120℃烘烤48小时,然后以不超过20℃/小时缓慢升温至工作温度。1490℃×3h煅烧后的性能,常温耐压强度89MPa、永久线变化率-0.16%、25℃×24h耐磨性4.7cm3、25℃导热系数1.36W•m-1•K-1、600℃导热系数1.25W•m-1•K-1、1100℃导热系数1.08W•m-1•K-1。
实施例3
按照重量百分比,选取粒度7~1mm的废旧高铝电瓷 34%、粒度3~1 mm的废旧高铝电瓷12%、粒度1~0.088 mm的刚玉18%、粒度≤0.044mm立方氮化硼粉6%、粒度≤0.044mm的碳化钛粉5%、球径≤0.5mm的氧化铝空心球12%、ρ-Al2O3 13%、烯丙基聚氧乙烯醚基马来酸酐0.15%,将以上原料经强力混碾均匀,制备成CFB锅炉回料器用低导热高强耐磨浇注料,用塑料袋防潮包装。施工时加水量3%,浇注施工完毕养护72小时后拆模,再自然干燥72小时,在120℃烘烤48小时,然后以不超过20℃/小时缓慢升温至工作温度。1490℃×3h煅烧后的性能,常温耐压强度92MPa、永久线变化率-0.16%、25℃×24h耐磨性4.6cm3、25℃导热系数1.39W•m-1•K-1、600℃导热系数1.29W•m-1•K-1、1100℃导热系数1.18W•m-1•K-1。
实施例4
按照重量百分比,选取粒度7~1mm的废旧高铝电瓷 30%、粒度3~1 mm的废旧高铝电瓷16%、粒度1~0.088 mm的刚玉9%、粒度≤0.044mm立方氮化硼粉9%、粒度≤0.044mm的碳化钛粉5%、球径≤0.5mm的氧化铝空心球15%、ρ-Al2O3 16%、烯丙基聚氧乙烯醚基马来酸酐0.1%,将以上原料经强力混碾均匀,制备成CFB锅炉回料器用低导热高强耐磨浇注料,用塑料袋防潮包装。施工时加水量3.5%,浇注施工完毕养护72小时后拆模,再自然干燥72小时,在120℃烘烤48小时,然后以不超过20℃/小时缓慢升温至工作温度。1490℃×3h煅烧后的性能,常温耐压强度89MPa、永久线变化率-0.16%、25℃×24h耐磨性4.6cm3、25℃导热系数1.38W•m-1•K-1、600℃导热系数1.27W•m-1•K-1、1100℃导热系数1.14W•m-1•K-1。
实施例5
按照重量百分比,选取粒度7~1mm的废旧高铝电瓷 26%、粒度3~1 mm的废旧高铝电瓷20%、粒度1~0.088 mm的刚玉5%、粒度≤0.044mm立方氮化硼粉8%、粒度≤0.044mm的碳化钛粉6%、球径≤0.5mm的氧化铝空心球17%、ρ-Al2O3 18%、烯丙基聚氧乙烯醚基马来酸酐0.1%,将以上原料经强力混碾均匀,制备成CFB锅炉回料器用低导热高强耐磨浇注料,用塑料袋防潮包装。施工时加水量3.5%,浇注施工完毕养护72小时后拆模,再自然干燥72小时,在120℃烘烤48小时,然后以不超过20℃/小时缓慢升温至工作温度。1490℃×3h煅烧后的性能,常温耐压强度90MPa、永久线变化率-0.16%、25℃×24h耐磨性4.6cm3、25℃导热系数1.33W•m-1•K-1、600℃导热系数1.26W•m-1•K-1、1100℃导热系数1.12W•m-1•K-1。
表1列出了实例的配方和性能,实例1、实例2、实例3、实例4、实例5的强度都在80MPa以上,耐磨性能25℃×24h耐磨性都小于5.0cm3,完全达到CFB锅炉回料器内性能要求,但因为引入了空心氧化铝使得实例的材料热导率数(实例均<1.5W•m-1•K-1),和普通回料器内的可塑料的热导率(普通的为3~5 W•m-1•K-1)相比,要小得多,有利于减少回料器内的热散失和节约能源。
表1 一种CFB锅炉回料器用刚玉-莫来石低导热高强耐磨浇注料实例和性能
Claims (1)
1.一种CFB锅炉回料器用刚玉- 莫来石低导热高强耐磨浇注料,以质量百分比表示,原料组成为:
粒度7~1mm的废旧高铝电瓷 26~50%;
粒度3~1 mm的废旧高铝电瓷 5~20%;
粒度1~0.088 mm的刚玉 5~18%;
粒度≤0.044mm的立方氮化硼粉 4~9%;
粒度≤0.044mm的碳化钛粉 4~6%;
球径≤0.5mm的氧化铝空心球 12~20%;
ρ-Al2O3 5~18%;
外加烯丙基聚氧乙烯醚基马来酸酐 0.1~0.15%;
按重量百分比选择原料,将上述原料混合,经强力混碾均匀,用塑料袋防潮包装;
使用时,将混合好的浇注料外加水3~3.5%,进行浇注施工,施工完毕后养护72小时拆模,自然干燥72小时,在100~120℃烘烤48小时,然后以不超过20℃/小时缓慢升温至工作温度。
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