CN110317069B - 一种用于高炉送风支管内衬的涂覆材料及涂覆方法 - Google Patents

一种用于高炉送风支管内衬的涂覆材料及涂覆方法 Download PDF

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CN110317069B
CN110317069B CN201810266757.3A CN201810266757A CN110317069B CN 110317069 B CN110317069 B CN 110317069B CN 201810266757 A CN201810266757 A CN 201810266757A CN 110317069 B CN110317069 B CN 110317069B
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缪伟良
赵思杰
潘景照
沈雪峰
甘继业
王海波
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Baoshan Iron and Steel Co Ltd
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Abstract

一种用于高炉送风支管内衬的涂覆材料及涂覆方法，按组分质量百分比包括：高炉矿渣粉70‑78％，硅溶胶10‑15％，三氧化二铝8‑12％，莫来石2.5‑3％，石膏0.2‑0.5％，该材料涂覆在高炉送风支管内衬表面后，可在高温作用下形成致密的保温层，使热量不易向耐材传导，起到保护耐材、保护送风支管、提高送风温度的作用，解决耐材易产生裂纹、剥落等问题，有效地提升送风支管寿命，减少送风支管损坏引起的高炉休减风，既可用于对送风支管内衬进行表面加固强化，也可对高炉送风支管内衬产生的裂缝进行修复，恢复原有耐材结构的完整性及强度。

Description

一种用于高炉送风支管内衬的涂覆材料及涂覆方法
技术领域
本发明属于高炉送风支管设备领域，具体涉及一种用于高炉送风支管内衬的涂覆材料及涂覆方法。
背景技术
高炉送风支管在使用中，由其单波纹管、双波纹管、拆装过程以及应力等问题，易产生裂纹，导致风管发红。
高炉送风支管一般采用双层耐火内衬不定形耐火材料，将内衬分成两层浇注，这样的耐材结构可以实现较低的送风支管表面温度，减少热损失、实现高风温，延长送风支管的寿命。
目前，高炉送风支管直吹管内衬材料普遍使用由粘土质捣打料、高铝质和刚玉质成分的浇注料，该浇注料热稳定性差，强度低，不耐高温气流冲刷，易产生裂纹，导致风管发红。改进后，高炉送风支管的内衬浇注料以烧结矾土、镁砂作原料，硅微粉作外加剂和结合剂，经机械搅拌成干状均匀集料，使用该浇注料时，加水搅拌，采用浇注振捣成型。
但是，这样的送风支管仍然存在易产生裂纹、导致送风支管外表面局部温度升高甚至发红的情况，带来安全隐患，若需休风更换则会影响高炉生产指标，导致成本上升。
发明内容
本发明的目的在于提供一种用于高炉送风支管内衬的涂覆材料及涂覆方法，该材料涂覆在高炉送风支管内衬表面后，可在高温作用下形成致密的保温层，使热量不易向耐材传导，起到保护耐材、保护送风支管、提高送风温度的作用，解决耐材易产生裂纹、剥落等问题，有效地提升送风支管寿命，减少送风支管损坏引起的高炉休减风。
为了达到上述目的，本发明提供如下技术方案：
一种用于高炉送风支管内衬的涂覆材料，按照质量百分比，其组分包括：
高炉矿渣粉 70-78％；
硅溶胶 10-15％；
三氧化二铝 8-12％；
莫来石 2.5-3％；
石膏 0.2-0.5％。
优选地，所述高炉矿渣粉的粒度为50-200目。
本发明涂覆材料中含有70-78％的高炉矿渣粉，高炉矿渣粉具有良好的隔热耐高温性能，且性能稳定，使热量不易向耐材传导，起到保护耐材的作用；高炉矿渣粉与石膏配合使用，使涂覆材料具有柔性，适于高炉中1200～1300℃的送风温度环境及冷热变化，使材料具有良好的粘结性及隔热作用。
本发明涂覆材料中含有硅溶胶，参与各材料的粘结和渗透固化作用，具有挥发快、强度高的特点，其含量应控制在10-15％，若硅溶胶含量太高，则涂覆材料易流淌；若含量太低，则粘结效果差。
本发明涂覆材料中的三氧化二铝，主要参与材料的强度，保证材料的耐冲刷性能；莫来石保证材料的抗热震性能及耐磨性能；石膏凝结速度快，主要参与材料的致密性。
本发明的涂覆材料采用非水系调和体系，能承担热应力的变化，具有良好的隔热性能及稳定性，具备适宜的粘结性，同时具有良好的抗热震性能及耐磨性能。
本发明所述涂覆材料在高炉送风支管内衬表面的涂覆方法，包括以下步骤：
1)将高炉送风支管冷却至常温；
2)将涂覆材料均匀地喷涂在高炉送风支管的内衬表面；
3)对喷涂料进行烘烤；
4)将送高炉风支管再次冷却至常温。
进一步，所述的高炉送风支管为内部耐材需要修复的高炉送风支管。
又，将所述涂覆材料整体涂覆于高炉送风支管内衬表面。
优选地，所述的高炉送风支管的送风温度为1200-1300℃。
本发明的涂覆材料可在高炉送风支管使用前用于对内衬进行表面强化，也可用于对高炉送风支管内衬产生的裂缝进行修复。
将本发明的涂覆材料涂在高炉送风支管内衬表面后，在高温作用下，能形成致密的保温层，热量不易向耐材传导，起到保护耐材、保护送风支管、提高送风温度的作用，解决耐材易产生裂纹、剥落等问题，有效地提升送风支管寿命，减少送风支管损坏引起的高炉休减风。
喷涂本发明涂覆材料后，高炉送风支管具有高温性能稳定，隔热性能好，吸附性良好的特点。
与现有技术相比本发明具有如下有益效果：
本发明的涂覆材料喷涂在高炉送风支管内衬表面后，在高温作用下形成致密的保温层，使热量不易向耐材传导，具有隔热作用，实现了保护耐材、保护送风支管、提高送风温度的作用，实用性强。
本发明的涂覆材料有效地提升送风支管寿命，减少送风支管损坏引起的高炉休减风。既可用于高炉送风支管的生产中，对送风支管内衬进行表面加固强化，提升送风支管的整体性能；也可在高炉送风支管使用后，对其内衬产生的裂缝进行修复，有效地填充、封堵耐材的裂纹、缝隙，修复原有耐材结构完整性及强度，起到修复作用。
附图说明
图1为本发明实施例中修复前的高炉送风支管在使用时的状态图。
具体实施方式
以下结合具体实施例，对本发明作进一步说明。
需要修复的高炉送风支管在修复前使用时，其外侧铁皮温度大于250℃、内衬表面裂纹、铁皮发红等现象，参见图1，其中AR01、AR03以及AR04处均发生明显的红热现象。
本发明实施例1-4涂覆材料的组成参见表1，各组分按照先液态后粉末的顺序进行混合。
表1各组分的含量按质量百分比单位为重量％
编号 高炉矿渣粉 硅溶胶 三氧化二铝 莫来石 石膏
实施例1 78 11 8 2.5 0.5
实施例2 76 12 9 2.6 0.4
实施例3 74 14 9 2.7 0.3
实施例4 70 16 11 2.8 0.2
对比例 65 20 12 2.5 0.5
将实施例1-4的涂覆材料用于修复高炉送风支管，该高炉送风支管具有双层耐火材料内衬，由内向外分别为内层耐火材料内衬及外层耐火材料内衬，将涂覆材料喷涂在该送风支管的内层耐火材料内衬表面，并经过120～200度范围烘烤热处理。
经过本发明材料修复后，送风支管内衬开裂情况得到改善，铁皮温度下降至控制温度以下，直吹管的温度由修复前的350℃左右下降了100℃左右，双波纹管温度在140-180℃，送风支管可以继续应用。

Claims (6)

1.一种用于高炉送风支管内衬的涂覆材料，所述高炉送风支管的送风温度为1200-1300℃，按照质量百分比，所述涂覆材料组分包括：
高炉矿渣粉70-78％；
硅溶胶10-15％；
三氧化二铝8-12％；
莫来石2.5-3％；
石膏0.2-0.5％；
所述涂覆材料在高炉送风支管内衬表面的涂覆方法，包括以下步骤：
1)将高炉送风支管冷却至常温；
2)将涂覆材料均匀地喷涂在高炉送风支管的内衬表面；
3)对喷涂料进行烘烤，烘烤温度120～200℃；
4)将高炉送 风支管再次冷却至常温。
2.根据权利要求1所述用于高炉送风支管内衬的涂覆材料，其特征在于，所述高炉矿渣粉的粒度为50-200目。
3.如权利要求1或2所述涂覆材料在高炉送风支管内衬表面的涂覆方法，其特征是，包括以下步骤：
1)将高炉送风支管冷却至常温；
2)将涂覆材料均匀地喷涂在高炉送风支管的内衬表面；
3)对喷涂料进行烘烤，烘烤温度120～200℃；
4)将高炉送 风支管再次冷却至常温。
4.如权利要求3所述涂覆材料在高炉送风支管内衬表面的涂覆方法，其特征在于，所述的高炉送风支管为内部耐材需要修复的高炉送风支管。
5.如权利要求3所述涂覆材料在高炉送风支管内衬表面的涂覆方法，其特征在于，将所述涂覆材料整体或局部涂覆于高炉送风支管内衬表面。
6.如权利要求4所述涂覆材料在高炉送风支管内衬表面的涂覆方法，其特征在于，将所述涂覆材料整体或局部涂覆于高炉送风支管内衬表面。
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