CN102584294A - 焦炉用复合高荷软耐火材料及筑炉工艺及其产品 - Google Patents
焦炉用复合高荷软耐火材料及筑炉工艺及其产品 Download PDFInfo
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Abstract
本发明公开了一种焦炉用复合高荷软耐火材料,其材质和配比及制备方法是按40-60%的Al2O3、15-30%的SiC微粉、小于2%的Fe2O3和5-10%的Si微粉,再加1-3%外加剂水泥,混练、捣匀后,再加入3-5%的Al(H2PO4)3粘接剂,搅拌和匀,20-30分钟后即可直接浇注到工作区域。筑炉工艺是炉膛经过以下步骤:清窑、测量、定型、定位支模、兑料、浇注校正、清理、启动升温和测试。新浇注筑成的焦化炉,其特征是炉膛顶部为扇形,炉膛是采用上述的筑炉材料按照上述的工艺进行现场无缝整体振动浇注,该炉余热可回收发电,无化学残留。本发明炭化时间缩短、出焦率提高,常温至1550℃随时启动使用。
Description
技术领域
本发明涉及一种耐火材料及炼焦炉,特别是一种扇型炼焦炉的复合高荷软耐火材料及筑炉工艺及其所得的扇型炼焦炉。
背景技术
传统的扇型炼焦炉筑炉工艺及材料,见图2,采用材质SiO2,模块式烧成硅砖筑炉,其特点是1、采用大量矩形硅砖及异型硅砖(底部衬砖为粘土砖)砌筑,筑炉工艺复杂耗时。2、硅砖经机压成型1500 oC烧结缓慢出炉,制成成品砖,由于其筑炉使用后,在温变情况下仍有多晶格相变的属性,决定其在筑炉完工之后仍需45天以上的缓慢升温,烘炉方可使用,残余石英的存在使其热振稳定性下降,且使用温度必须控制在800oC—1650 oC之间长期使用,持续使用荷软性能良好,800 oC以下时稳定性差。其材质SiO2的特点是1、极强抗酸腐蚀性。2、800oC—1650 oC之间适于持续长期使用,荷软性能良好。3、使用时间条件较苛刻,不能反复启动使用,仅可一次性使用,耐磨性,抗结皮性能及挂窑性不足。另外,硅砖模块式结构由于硅砖膨胀率过大存在伸缩缝,是气密性不高的主要原因。
过去由于受材料限制焦化耐材用户理论上接受现场整浇的方案,但均不敢付诸实际,加之认为后期维护较难,因此一直对该整浇技术敬而远之。
另外,国内耐材行业曾尝试采用高炉铝砖、镁铬尖晶石砖、含锆系列产品替代硅砖在焦化炉窑上使用,但因为铬Cr有二次污染,且该元素解毒难,解毒成本高;锆Zr系产品价格高昂,没有使用在焦化炉上的可能。所以上述产品综合性能指标不足或不环保以及价格太高也没有市场推广。
发明内容
本发明的目的在于提供一种扇型炼焦炉的复合高荷软耐火材料及筑炉工艺及其所得的扇型炼焦炉,所得的扇型炼焦炉烧焦时间缩短、出焦率提高,筑炉工艺可以为炉膛量身定做最佳的使用材料,来服务于实际生产的需求,常温至 1550 oC随时启动使用。
本发明的构成:一种焦炉用复合高荷软耐火材料,其材质和配比及制备方法是按40-60 %的Al2O3、15-30%的SiC微粉、小于2%的 Fe2O3和5-10%的Si微粉,再加1-3% 外加剂水泥,混练、捣匀后,再加入3-5%的Al(H2PO4)3 粘接剂,搅拌和匀,20-30分钟后即可直接浇注到工作区域。
所述的Al2O3为铝矾土熟料:15mm 20%、3-5mm 15%、1-3mm12%、0-1mm 5%、180目5-10%。
用所述的焦炉用复合高荷软耐火材料的筑炉工艺是,炉膛采用如上材料进行现场无缝整体振动浇注,经过以下步骤:清窑、测量、定型、定位支模、兑料、????浇注校正、清理、启动升温和测试;
具体地:1、清窑:清理残砖、清理炉堂内的杂物残余废渣及预留孔、压力表、温度表的安装位置等;2、测量:测量清窑后炉窑金属壳体的参数变化及炉体预留施工空间;3、定型:据用户的实际需求结合原设计的要求,按照设计要求、浇注厚度进行浇注前耐材工作层尺寸性能及整个工作空间的容积、形状、气孔孔径、幅度、长度、数量等量化定性成型;4、定位支模:据壳体结构情况利用不锈钢现场强化铆锚、布局,利用软性材料将炭化室、储热室空间格局规划设置,实现后期浇注的合理性、可行性、牢固性;5、兑料:按炉窑各个工作区域未来的工况需求,匹配相应可塑性整浇耐火材料,整体浇注时耐材的使用数量、品质、施工工期设计方案和定型;6、浇注校正:利用已搅匀的耐火材料,一次性完成浇注,浇注完成后校正形状、空间、尺寸;7、清理:现场清理废弃杂物、做到现场清洁干净;8、启动升温:根据浇注料的升温曲线,加热升温即在24-72小时内,完成浇注料的全部理化反应过程,9、测试:升温完成后,炭化室即可进料生产,经过3次的出炉炭化周期重新据用户实际生产状况调整风量、炭化室压力等技术参数,新参数设定,运行正常即交付使用。
如所述的筑炉工艺筑成的焦化炉,其特征是炉膛顶部为扇形,炉膛是采用上述的筑炉材料按照上述的工艺进行现场无缝整体振动浇注,该炉产生的余热气体主要是煤气CO,通过管道直接用于锅炉燃烧产生蒸汽推动发电机组发电,或者余热气体不收集,仅作气体燃料使用,不生产任何化学品,或者在排烟管道内设有脱硫设备,脱硫后就排放。
从以上技术方案可知,本发明烧焦时间缩短、出焦率提高,可以为炉膛量身定做最佳的使用材料,来服务于实际生产的需求,常温至1550 oC随时启动使用;本发明的无缝整体振动浇注,气密性极高,加之材料的微膨胀率与炉体金属结构的结合性能提高;本发明的焦化炉余热可回收发电,无化学残留。
附图说明
图1是本发明的结构示意图,
图2是现有技术的结构示意图,
图3是本发明的工艺流程图。
具体实施方式
下面通过附图和实施例来对本发明的焦炉用复合高荷软耐火材料及筑炉工艺及其产品作进一步的说明。
一种焦炉用复合高荷软耐火材料,其材质和配比及制备方法是按40-60 %的Al2O3、15-30%的SiC微粉、小于2%的 Fe2O3和5-10%的Si微粉,再加1-3% 外加剂水泥,混练、捣匀后,再加入3-5%的Al(H2PO4)3 粘接剂,搅拌和匀,20-30分钟后即可直接浇注到工作区域。
所述的Al2O3为铝矾土熟料:15mm 20%、3-5mm 15%、1-3mm12%、0-1mm 5%、180目5-10%。
用所述的焦炉用复合高荷软耐火材料的筑炉工艺是,炉膛采用如上材料进行现场无缝整体振动浇注,经过以下步骤:清窑、测量、定型、定位支模、兑料、????浇注校正、清理、启动升温和测试;
具体地:1、清窑:清理残砖、清理炉堂内的杂物残余废渣及预留孔、压力表、温度表的安装位置等;2、测量:测量清窑后炉窑金属壳体的参数变化及炉体预留施工空间;3、定型:据用户的实际需求结合原设计的要求,按照设计要求、浇注厚度进行浇注前耐材工作层尺寸性能及整个工作空间的容积、形状、气孔孔径、幅度、长度、数量等量化定性成型;4、定位支模:据壳体结构情况利用不锈钢现场强化铆锚、布局,利用软性材料将炭化室、储热室空间格局规划设置,实现后期浇注的合理性、可行性、牢固性;5、兑料:按炉窑各个工作区域未来的工况需求,匹配相应可塑性整浇耐火材料,整体浇注时耐材的使用数量、品质、施工工期设计方案和定型;6、????浇注校正:利用已搅匀的耐火材料,一次性完成浇注,浇注完成后校正形状、空间、尺寸;7、清理:现场清理废弃杂物、做到现场清洁干净;8、启动升温:根据浇注料的升温曲线,加热升温即在24-72小时内,完成浇注料的全部理化反应过程,9、测试:升温完成后,炭化室即可进料生产,经过3次的出炉炭化周期重新据用户实际生产状况调整风量、炭化室压力等技术参数,新参数设定,运行正常即交付使用。
如所述的筑炉工艺筑成的焦化炉,其特征是炉膛顶部为扇形,炉膛是采用上述的筑炉材料按照上述的工艺进行现场无缝整体振动浇注,该炉产生的余热气体主要是煤气CO,通过管道直接用于锅炉燃烧产生蒸汽推动发电机组发电,或者余热气体不收集,仅作气体燃料使用,不生产任何化学品,或者在排烟管道内设有脱硫设备,脱硫后就排放。
本发明的主要材质为Al2O3、SiC,具有以下特点:1、抗酸及盐侵蚀,有极高的荷软温度、高耐磨性,挂窑性好、抗结皮性能高,良好的热震稳定性,可反复启动使用。2、烧焦时间缩短、出焦率提高,可以为炉膛量身定做最佳的使用材料,来服务于实际生产的需求,常温—1550 oC随时启动使用。
本发明的工艺特点是1、焦化炉炉膛采用新型可塑性耐火材料进行现场无缝整体振动浇注。2、可据炉内的不同工况部位调整其材料的最佳适用参数。
如工艺复杂的扇形拱顶部分通过浇注耐高温气相化学侵蚀、但导热率较低的耐火浇注料;所用的耐火浇注料良好的可塑性,避免了硅砖拱顶传统工艺回避不了的大量异型模具的生产和使用,顶部的保温性能提高、热损降低;两侧浇注料的导热系数则尽量提高,有利于缩短炭化时间;底部则偏重耐磨性能好、热振稳定性极好,机械强度、高荷软性能、高抗液相化学侵蚀的浇注料,彻底避免穿炉现象。
本发明的焦炉用复合高荷软耐火材料性能指标如下:
化学成分指标:
Al2O3 % ≥ 40
SiC % ≥ 25
Si % ≥ 10
Fe2O3 % ≥ 2
体积密度(g/cm3) (110℃×24h干后) ≥ 2.40
线变化率 % (1000℃×3h) -3/+0.3
常温耐压强度MPa(1000℃×3h烧后)≥ 100
常温抗折强度MPa(1000℃×3h烧后)≥ 13
常温磨损量 cm (1000℃×3h烧后)≤ 5
热震稳定性 次(1100℃,水冷)≥ 60
耐火度,℃≥ 1750
荷重软化温度,℃≥ 1550
导热系数及膨胀率据实践工况进行调整
本发明的焦炉用复合高荷软耐火材料和工艺技术目前是填补了国内炼焦炉技术上空白,也是国际上较先进的发明之一,尤其是针对高硫煤地区对使用硅砖缺陷的弥补有着很高的实用价值和现实意义。
因为硅砖耐用性工况要求的苛刻有着限制以及明显区域性特征:
1)在低P、S及杂质低的优质炼焦煤产期优势明显,针对高硫炼焦煤产区,由于其硫化物含量及金属盐成份复杂,在炼焦炭化过程中将会富集大量的高温液相金属在炭化室底部,主要是铁Fe,溢出的高温使硅砖荷软温度降低并有极强的渗透性及腐蚀性,它随着炉子底部裂缝浸入侵蚀,并将炉底粘土质衬砖烧毁,主要是铁Fe的金属液体窜至燃烧室炉堂,导致炭化室、燃烧室串通引起烧焦,出焦率降低,资源损耗加大。
2)硅质耐材是一个受严格时间条件及温度条件等工况限制的耐火材料,即用户必须在特定温度800oC—1750 oC的范围内,且持续使用的条件下,主体耐材5年左右的使用寿命才有可能,并且不可用劣质炼焦原煤;可一旦停炉,温度接近或低于800oC时整个炉膛将全部硅裂无法重新启动工作。
3)在环保清洁型炼焦炉实际生产过程中,每隔约72—90小时推焦出炉一次,焦化炉炉门必须打开5分钟以上,此时接近推焦门和出焦门,两侧及顶部和底部近门端80—150mm 处很快会从1200oC±50降至1000oC以下,由于硅砖的热震温定性差,因此在冷空气的侵入下,硅砖迅速收缩变形导致硅砖无法继续使用,由于硅砖的热震稳定性极差,以硅砖筑炉的任何炉膛都不可能随停随启的使用,必须一烧到底,一烧必须到底的劣势完全违背了产品的市场规律,不利企业运营的统筹规划,因此硅砖的淘汰是大势所趋。
本发明的焦炉用复合高荷软耐火材料及筑炉工艺及其产品填补了国内这一技术空白,有着很大的市场推广价值和意义,对国民经济的建设及节能、减排、增效方面都有着极高的战略意义和现实意义。
Claims (4)
1. 一种焦炉用复合高荷软耐火材料,其特征是:其材质和配比及制备方法是按40-60 %的Al2O3、15-30%的SiC微粉、小于2%的 Fe2O3和5-10%的Si微粉, 再加1-3% 外加剂水泥,混练、捣匀后,再加入3-5%的Al(H2PO4)3 粘接剂,搅拌和匀,20-30分钟后即可直接浇注到工作区域。
2.如权利要求1的焦炉用复合高荷软耐火材料,其特征是:所述的Al2O3为铝矾土熟料:15mm 20%、3-5mm 15%、1-3mm12%、0-1mm 5%、180目5-10%。
3.用权利要求1或2所述的焦炉用复合高荷软耐火材料的筑炉工艺,其特征是炉膛采用如上材料进行现场无缝整体振动浇注,经过以下步骤:清窑、测量、定型、定位支模、兑料、浇注校正、清理、启动升温和测试;
具体地:1、清窑:清理残砖、清理炉堂内的杂物残余废渣及预留孔、压力表、温度表的安装位置等;2、测量:测量清窑后炉窑金属壳体的参数变化及炉体预留施工空间;3、定型:据用户的实际需求结合原设计的要求,按照设计要求、浇注厚度进行浇注前耐材工作层尺寸性能及整个工作空间的容积、形状、气孔孔径、幅度、长度、数量等量化定性成型;4、定位支模:据壳体结构情况利用不锈钢现场强化铆锚、布局,利用软性材料将炭化室、储热室空间格局规划设置,实现后期浇注的合理性、可行性、牢固性;5、兑料:按炉窑各个工作区域未来的工况需求,匹配相应可塑性整浇耐火材料,整体浇注时耐材的使用数量、品质、施工工期设计方案和定型;6、浇注校正:利用已搅匀的耐火材料,一次性完成浇注,浇注完成后校正形状、空间、尺寸;7、清理:现场清理废弃杂物、做到现场清洁干净;8、启动升温:根据浇注料的升温曲线,加热升温即在24-72小时内,完成浇注料的全部理化反应过程,9、测试:升温完成后,炭化室即可进料生产,经过3次的出炉炭化周期重新据用户实际生产状况调整风量、炭化室压力等技术参数,新参数设定,运行正常即交付使用。
4.如权利要求3所述的筑炉工艺筑成的焦化炉,其特征是炉膛顶部为扇形,炉膛是采用上述的筑炉材料按照上述的工艺进行现场无缝整体振动浇注,该炉产生的余热气体主要是煤气CO,通过管道直接用于锅炉燃烧产生蒸汽推动发电机组发电,或者余热气体不收集,仅作气体燃料使用,不生产任何化学品,或者在排烟管道内设有脱硫设备,脱硫后就排放。
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