CN107188583B - 一种用于cfb锅炉内衬裂缝的填缝料 - Google Patents
一种用于cfb锅炉内衬裂缝的填缝料 Download PDFInfo
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Abstract
本发明涉及一种用于CFB锅炉内衬裂缝的填缝料,属于无机非金属材料学科耐火材料领域。本发明采用氧化铝粉、红柱石粉、镁铝合金粉、聚甲基丙烯酸甲酯(PMMA)、焦油为原料,按比例混合均匀后密封包装。本发明的填缝料的优点是:修补时采用挤压设备直接压入裂缝即可,施工量小。修补后无需养护,修补料经高温的原位反应生成的产物有微膨胀有利于填缝密实,且最终形成高温性能好、力学强度高、耐磨性好、和原锅炉内衬材料烧结成为一体的耐磨衬里。
Description
技术领域
本发明涉及一种用于CFB锅炉内衬裂缝的填缝料,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。但在CFB锅炉运行调节中,频繁的启停操作都会使炉内温度循环波动和炉内温度快速的变化,产生热应力,导致内衬材料产生裂缝。由于裂缝的温度反复变化或床料吹入裂缝中,会导致耐火层挤压脱落,严重影响锅炉的寿命和运行安全。常用的方法是停炉检修挖补,但工程量大,停炉时间长,补后需要养护等。
现有技术公开了一些快速修补料配方,比如上海万都电力工程有限公司公开的专利CN103449824A中披露了一种超耐磨铬刚玉快速修复料及其制备方法,该修补料由甲料和乙料两组料配制而成,甲料由铬刚玉、锆英砂、红柱石、氧化铝微粉、硅微粉、纯铝酸钙水泥、三聚磷酸钠、固体磷酸铝、碳化硅、氧化钇组成,乙料由磷酸溶液和氢氧化铝组成,甲料和乙料重量百分比分别为75-80%和25-20%。专利CN103449824A的组分比较复杂,不太符合绿色产品制造的潮流,绿色产品的要求是尽量使用简单的组成,尽量不适用有毒有害的组成,这样材料在用后有利于回收再利用,过于复杂的组成,用后回收再利用十分困难,用户只能是固体废物难以处理。且专利CN103449824A使用了价格相对较高昂的稀土氧化物氧化钇,浪费了宝贵的稀土资源,也造成规模化生产中性价比不高。
实际上,填缝耐磨修补材料要解决的关键问题是一方面将出现缝隙充分填充密实,这要求修补料在高温下有合适的体积膨胀,保证充分修补好裂缝的前提下不引起新的裂缝或应力集中;另一方面,修补料在发生轻微体积膨胀过程中尽可能与周围耐火材料实现界面相容,这要求修补料在高温下与周围耐火材料成分匹配。
本发明针对CFB锅炉内衬裂缝研发一种刚玉质填缝料,这种修补料通过巧妙搭配原料组分,保证了在高温条件下实现适中的微膨胀率,在使用时直接压入裂缝中对裂缝进行修补,工程量很小,修补施工结束后也不需要养护,甚至不需要冷炉,只需要把炉料暂时停止加入,采用机压设备即可进行压入修补料施工操作。
发明内容
本发明是一种用于CFB锅炉内衬裂缝的填缝料,其主要原料为氧化铝粉、红柱石粉、镁铝合金粉、聚甲基丙烯酸甲酯(PMMA) 、焦油,以质量百分比表示,原料具体由以下组分组成:
氧化铝粉60~78 %,
红柱石粉料12~23%,
镁铝合金粉2~8%,
聚甲基丙烯酸甲酯(PMMA)粉2~5%,
液体焦油4~6%。
其中,所述氧化铝粉的粒度为0.088~1mm,所述红柱石粉料的粒度为0.044~0.088mm,所述镁铝合金粉的粒度为0.044~0.088mm;
进一步,所述聚甲基丙烯酸甲酯(PMMA)粉的粒度≤0.044mm。
将上述原料按照以上重量百分比配料,倒入搅拌磨中以20~100转/min的转速搅拌2~6min,均匀混合成潮湿泥团料,使用塑料密封包装后即制得本发明所述的修补料。
镁铝合金粉在高温下氧化伴有体积膨胀,且原位反应形成尖晶石,伴有体积膨胀。红柱石粉在高温下莫来石化也伴有体积微膨胀,并且具有良好的热震稳定性和较低的导热系数,因此在高温环境下,保证修补料不发生较大的收缩和表面开裂。聚甲基丙烯酸甲酯(PMMA)膨胀系数大,焦油为有机溶剂,聚甲基丙烯酸甲酯(PMMA)和焦油在高温下均会烧失,为尖晶石和莫来石膨胀预留体积,另外加入有机溶剂也可防止镁铝合金粉研磨时接触空气或氧气爆燃。
压入锅炉裂缝后,压缝修补料在高温下最终原位形成以莫来石、镁铝尖晶石、镁橄榄石为主晶相的多相材料,多相材料和原锅炉内衬材料烧结成为一体的致密内衬。
本发明与现有技术方案相比具有以下有益技术效果:
(1)修补时施工量小,采用挤压设备直接压入裂缝即可。
(2)修补后无需养护,直接继续加料和点火即可。
(3)填缝料经高温原位反应后有微膨胀,有利于填缝密实,且最终形成高温性能好、力学强度高、耐磨性好、和原锅炉内衬材料烧结成为一体的耐磨衬里。
具体实施方式
实施例1
按照重量百分比选取原料,取粒度为1~0.088mm的氧化铝粉78%、粒度为0.088~0.044mm红柱石粉料12%、粒度为0.088~0.044mm镁铝合金粉2%、粒度≤0.044mm聚甲基丙烯酸甲酯(PMMA)粉2%以及液体焦油6%,混合倒入搅拌磨以20转/min的转速搅拌6min,均匀混合成潮湿泥团料,塑料密封包装即制得本发明的修补料。经过测试,1580℃×3h烧后密度达到2.91g/cm3,重烧线变化率0.6%,25℃×24h耐磨性5.0cm3。
实施例2
按照重量百分比选取原料,取粒度为1~0.088mm的氧化铝粉75%、粒度为0.088~0.044mm红柱石粉料15%、粒度为0.088~0.044mm镁铝合金粉2%、粒度≤0.044mm聚甲基丙烯酸甲酯(PMMA)粉2%以及液体焦油6%,混合倒入搅拌磨以100转/min的转速搅拌2min,均匀混合成潮湿泥团料,塑料密封包装即制得本发明的修补料。经过测试,1580℃×3h烧后密度达到2.91g/cm3,重烧线变化率0.5%,25℃×24h耐磨性5.0cm3。
实施例3
按照重量百分比选取原料,取粒度为1~0.088mm的氧化铝粉70%、粒度为0.088~0.044mm红柱石粉料17%、粒度为0.088~0.044mm镁铝合金粉5%、粒度≤0.044mm聚甲基丙烯酸甲酯(PMMA)粉3%以及液体焦油5%,混合倒入搅拌磨以50转/min的转速搅拌4min,均匀混合成潮湿泥团料,塑料密封包装。经过测试,1580℃×3h烧后密度达到2.90g/cm3,重烧线变化率0.6%,25℃×24h耐磨性5.1cm3。
实施例4
按照重量百分比选取原料,取粒度为1~0.088mm的氧化铝粉65%、粒度为0.088~0.044mm红柱石粉料22%、粒度为0.088~0.044mm镁铝合金粉5%、粒度≤0.044mm聚甲基丙烯酸甲酯(PMMA)粉3%以及液体焦油5%,混合倒入搅拌磨以50转/min的转速搅拌4min,均匀混合成潮湿泥团料,塑料密封包装。经过测试,1580℃×3h烧后密度达到2.90g/cm3,重烧线变化率0.5%,25℃×24h耐磨性5.1cm3。
实施例5
按照重量百分比选取原料,取粒度为1~0.088mm的氧化铝粉60 %、粒度为0.088~0.044mm红柱石粉料23%、粒度为0.088~0.044mm镁铝合金粉8%、粒度≤0.044mm聚甲基丙烯酸甲酯(PMMA)粉5%以及液体焦油4%,混合倒入搅拌磨以10转/min的转速搅拌6min,均匀混合成潮湿泥团料,塑料密封包装。经过测试,1580℃×3h烧后密度达到2.89g/cm3,重烧线变化率0.5%,25℃×24h耐磨性5.2cm3。
对比例1
按照重量百分比选取原料,取粒度为1~0.088mm的氧化铝粉85%、粒度为0.088~0.044mm红柱石粉料0%、粒度为0.088~0.044mm镁铝合金粉7%、粒度≤0.044mm聚甲基丙烯酸甲酯(PMMA)粉2%以及液体焦油6%,混合倒入搅拌磨以100转/min的转速搅拌2min,均匀混合成潮湿泥团料,塑料密封包装即制得本发明的修补料。经过测试,1580℃×3h烧后密度达到2.80g/cm3,重烧线变化率0.7%,25℃×24h耐磨性6.3cm3。
对比例2
按照重量百分比选取原料,取粒度为1~0.088mm的氧化铝粉79%、粒度为0.088~0.044mm红柱石粉料7%、粒度为0.088~0.044mm镁铝合金粉6%、粒度≤0.044mm聚甲基丙烯酸甲酯(PMMA)粉2%以及液体焦油6%,混合倒入搅拌磨以100转/min的转速搅拌2min,均匀混合成潮湿泥团料,塑料密封包装即制得本发明的修补料。经过测试,1580℃×3h烧后密度达到2.88g/cm3,重烧线变化率0.8%,25℃×24h耐磨性5.8cm3。
对比例3
按照重量百分比选取原料,取粒度为1~0.088mm的氧化铝粉78%、粒度为0.088~0.044mm红柱石粉料14%、粒度为0.088~0.044mm镁铝合金粉0%、粒度≤0.044mm聚甲基丙烯酸甲酯(PMMA)粉2%以及液体焦油6%,混合倒入搅拌磨以100转/min的转速搅拌2min,均匀混合成潮湿泥团料,塑料密封包装即制得本发明的修补料。经过测试,1580℃×3h烧后密度达到2.93g/cm3,重烧线变化率-0.2%,25℃×24h耐磨性5.0cm3。
对比例4
按照重量百分比选取原料,取粒度为1~0.088mm的氧化铝55%、粒度为0.088~0.044mm红柱石粉料25%、粒度为0.088~0.044mm镁铝合金粉11%、粒度≤0.044mm聚甲基丙烯酸甲酯(PMMA)粉5%以及液体焦油4%,混合倒入搅拌磨以10转/min的转速搅拌6min,均匀混合成潮湿泥团料,塑料密封包装即制得本发明的修补料。经过测试,1580℃×3h烧后密度达到2.86g/cm3,重烧线变化率1.2%,25℃×24h耐磨性6.8cm3。
表1列出了实施例与对比例相关配比及性能参数。
表1. 实施例与对比例相关配比及参数对比表
通过实施例和对比例的相关配方和实测性能,见表1。对比分析有:当未加入红柱石粉时,对比例1,填缝料在1580℃(此温度和锅炉内的温度相当)烧结困难,因此填缝料的体积密度低,仅有2.80 g/cm3,即使耐磨成分氧化铝粉含量高,85%,耐磨性仍然很差,25℃×24h磨损量为6.3cm3。对比例2,引入了7%红柱石粉,烧结性能显著的得到改善,1580℃烧后的体积密度上升到了2.88 g/cm3,但是可能是由于加入7%红柱石粉和加入6%镁铝合金粉,红柱石二次莫来石化反体积膨胀和镁铝合金粉氧化和原位反应生成尖晶石都有体积膨胀,导致体积膨胀大,烧后线变化为0.8%,使得材料不够致密,耐磨性能仍然不够好,25℃×24h磨损量为5.8cm3。对比例3未加入添加料镁铝合金粉,填缝料的烧结性能最佳,1580℃烧后的体积密度为2.93 g/cm3,耐磨性能也较好,25℃×24h磨损量为5.0cm3,但填缝料此时体积收缩严重,1580℃烧后线变化为-0.2%,显然不能使裂缝封堵严实,没有达到填补裂缝的良好效果。对比例4,氧化铝含量降低至55%,而红柱石粉料升高至25%、镁铝合金粉含量升高至11%,此时的红柱石二次莫来石化反体积膨胀和镁铝合金粉氧化和原位反应生成尖晶石都有体积膨胀,导致体积膨胀非常大,烧后线变化为1.2%,过度膨胀导致受到挤压产生很多裂纹,耐磨损性能急剧下降,25℃×24h磨损量为6.8cm3,显然不能胜任CFB锅炉的工作环境。纵观实例和对比例,本发明的配方的主要组成物质必须要符合严格的配方范围,氧化铝粉60~78 %,红柱石粉料12~23%,镁铝合金粉2~8%,聚甲基丙烯酸甲酯(PMMA)粉2~5%,液体焦油4~6%,超出了这些范围均会导致性能的恶化,不能满足CFB锅炉的服役的条件。
Claims (1)
1.一种用于CFB锅炉内衬裂缝的填缝料,原料具体由以下重量百分比组分构成:
氧化铝粉 60~78 %
红柱石粉料 12~23%
镁铝合金粉 2~8%
聚甲基丙烯酸甲酯粉 2~5%
液体焦油 4~6%
所述氧化铝粉的粒度为0.088~1mm
所述红柱石粉料的粒度为0.044~0.088mm
所述镁铝合金粉的粒度为0.044~0.088mm
所述聚甲基丙烯酸甲酯粉的粒度≤0.044mm;
所述的一种用于CFB锅炉内衬裂缝的填缝料的制备方法为将原料按照重量百分比配料,倒入搅拌磨中以20~100转/min的转速搅拌2~6min,均匀混合成潮湿泥团料,使用塑料密封包装后即可。
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