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?耐火材料施工廠家和您說說它的現狀與節能

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?耐火材料施工廠家和您說說它的現狀與節能

發布日期:2019-11-18 作者: 點擊:

耐火材料施工廠家和您說說它的現狀與節能

 耐火材料是硅酸鹽學科的一個分支,硅酸鹽材料一般分為:水泥、玻璃、陶瓷和耐火材料。而耐火材料從運用的角度來分又可分為:冶金工業用耐火材料、水泥職業用耐火材料、玻璃職業用耐火材料和其他耐火材料。

 

各種耐火材料的發展過程和現狀剖析

1、輕質耐火材料

輕質耐火材料是指氣孔率高、體積密度小、熱導率低的耐火材料。在工業窯爐和其他熱工設備上用作隔熱材料。與一般耐火磚比較,抗渣蝕性、力學強度、耐磨損性較差,高溫下體積收縮較大等。有多種分類辦法:

按體積密度分類。體積密度在 0.3~1.3克/厘米3的為輕質磚;低于 0.3克/厘米3的為超輕質磚。

按運用溫度分類。運用溫度600~900℃為低溫隔熱材料;900~1200℃為中溫隔熱材料;超過1200℃的為高溫隔熱材料。

按制品形狀分類。一種是定形的輕質耐火磚,包括粘土質、高鋁質、硅質以及某些純氧化物輕質磚等;另一種是不定形輕質耐火材料,如輕質耐火混凝土等。

輕質耐火材料在現代陶瓷窯爐中應用較為廣泛,首要因為其質輕、施工方便等特色,操作起來比較簡單。修建衛生陶瓷隧道窯、輥道窯、和其它陶瓷職業常用的推板窯等一些長形窯爐,因為有預熱帶、燒成帶、保溫帶、冷卻帶等,根據不同段的不同溫度合理運用輕質耐火材料對窯爐的節能特別重要。

輕質耐火材料早期以輕質粘土磚為主,因為耐溫性能有限,只能用到溫度比較低的窯爐內運用,上世紀九十年代后期莫來石、氧化鋁熔融噴吹技能逐漸老練從而開發了空心球磚,近幾年來耐火材料發泡工藝的老練又開發了發泡型輕質耐火材料,使耐火材料的熱導率大大降低,形成了隔熱性輕質耐火材料。本世紀初,耐火纖維技能發展較快,耐火纖維的壓成板、氈等定型材料工藝逐步完善且耐火纖維的溫度不斷提高,形成了現在的耐火纖維隔熱材料系列產品。

2、重質耐火材料

重質耐火保溫磚基本有以下幾個種類:

1.酸性磚:硅磚(SiO2),耐火粘土磚(SiO2+Al2O3)

2.中性磚:高鋁磚,鉻磚(Cr2O3+Al2O3,MgO,FeO)

3.堿性磚:鎂磚,鉻鎂磚,白云石磚

4.特種磚:尖晶石磚,鋯英石磚,氧化鋯磚,碳磚,碳化硅磚,其他磚。

陶瓷窯爐早期用耐火材料以重質磚為主,隨著輕質隔熱耐火材料的不斷完善,重質磚基本上在修建衛生陶瓷的隧道窯、軌跡窯等除非有特殊需求外不再運用。而在耐腐蝕的窯爐如熔塊窯、做色料的梭式窯、回轉窯等范疇仍然運用重質耐火材料。意圖是為了不至于掉渣、抗腐蝕強度好。特別是熔塊窯,物料直接和耐火材料觸摸,更應該慎重選擇重質耐火材料,特別是原料、密度和導熱系數等。這類窯爐的特色恰恰和隧道窯、軌跡窯相反,一般重質耐火材料在內層而重質耐火材料和保溫材料在中外層。

  耐火材料施工廠家和您說說它的現狀與節能

 

 


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