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工業窯爐中常見窯爐類型淺析

文章發布于:2016-04-12 09:52 作者:admin 瀏覽次數:

    工業窯爐中有比較重要的三種窯爐,分別為梭式窯、隧道窯、輥道窯。下面我們從梭式窯、隧道窯、輥道窯的特點、適用范圍、節能比較等方面全面認識這三種窯爐。

    1、梭式窯

    間隙式生產窯爐,適合小批量多品種生產,由于生產的靈活性,現在很多中小陶瓷瓷廠都還采用這種窯爐。但由于是間隙式,窯壁、臺車要吸熱消耗能量,總的比較起來耗能相對較高,但通過窯爐設計和制造者的努力,比如采用高速燃燒機快速燒成,采用輕質耐火保溫材料減少窯爐蓄熱,有的快速燒成梭式窯已達到與舊有隧道窯相媲美的節能效果。

    2、隧道窯

    故名思議,它的窯體像隧道。其實廣義上的隧道窯包含輥道窯、臺車式隧道窯、推板窯、轉盤窯都屬于隧道窯的范圍。狹義上的隧道窯。我們僅指臺車式隧道窯,但潮式叫法叫推板窯,五年前在潮州聽到真把我搞糊涂了,事實上我要說明一下,推板窯是耐火板直接承載在耐高溫的導軌上,(如剛王磚導軌或剛玉球導軌能原地滾動)耐火板一塊接著一塊,由于受耐火板承載推力所限制,一般不長,長則二十米,短則幾米,一般燒成高溫粉末或特種陶瓷,日產量不大。由于推進器直接推動耐火板前進,叫推板窯。但這里都習慣了,我也知道了潮州的推板窯是臺車式隧道窯。隧道窯由于連續式生產,預熱帶的熱量基本是由燒成帶的煙氣帶來的余熱供應,由于窯爐窯壁不像梭式窯,不存在升溫再冷卻的循環熱損失,燒成帶的高溫煙氣余熱大部分能利用,故比間隙式窯爐節能效果好。但由于臺車還是要經過升溫再冷卻,浪費部分熱量,它的節能效果及溫差不及輥道窯。

    3、輥道窯

    是用耐高溫的陶瓷棍棒直接驅動耐火板前進,裝載產品的耐火板直接承載在棍棒上,又稱羅拉窯。我們最早引進是燒成墻地面磚,沒有托板,地面磚直接放在棍棒上,由于在預熱、燒成、冷卻過程中溫差極小,燒成時間從我們過去用梭式窯、隧道窯燒成的十幾個小時,一下縮短幾十分鐘,故而推廣到藝術陶瓷、日用陶瓷,隨著棍棒質量的提高,從低溫型逐步到中高溫型轉變。由于輥道窯是耐火板直接承載于原地滾動的棍棒上前進,它沒有像隧道窯要用一個個臺車吸收很大一部分熱量,它也比隧道窯的氣密性好得多。所以它的節能效果比隧道窯要好,它的一個最大缺陷就是燒成高溫還原的產品,對棍棒的質量要求較高,采用碳化硅棍棒,可較好地解決1350℃以內的高溫陶瓷產品的燒成。但它還沒有解決窯變釉,結晶釉的燒成,因為它速度較快。

    以上分析了,梭式窯、隧道窯、輥道窯的大致結構及優缺點,企業可以根據自己的產品結構、產量以及經濟能力來選用適合自己的窯爐:

    1、對于日產量在20m3以下,且產品種類較多,燒成溫度各一,由于其本身產量難以滿足隧道窯的生產量,推薦采用快速燒成梭式窯。

    2、對于日產量或大于20m3,但其釉色復雜,如窯變結晶釉需一定的恒溫及冷卻時間,從您建窯經濟上的考慮,可采用傳統梭式窯或電熱梭式窯;如果您窯變釉或結晶釉只是部分,您可以選用快速窯,快速窯不是只快,也可以慢的。慢,溫差可控制很小。但慢的節能效果差。

    3、對產量較大、高度較高、重量較重、溫度較高、釉色單一,可選用臺車式隧道窯。如高溫日用陶瓷,衛浴陶瓷

    4、對溫度在1300℃以內,產量較大的藝術陶瓷、日用陶瓷、衛浴陶瓷,建議您采用輥道窯,或大型快速梭式窯。

    電熱窯與燃氣窯的優缺點:電熱窯由于發熱體不產生煙氣,在燒成過程中只有坯體本身的揮發物排出,對梭式窯而言窯爐可以很密封,只需幾個排氣孔,沒有煙氣帶出熱量。燒成1200℃以下中低溫氧化燒成,現在生產成本較燃氣窯低。據測算在電費0.8元/度,液化氣價格6.2元/KG,這個比價是一個平衡點。用連續式電熱輥道窯燒成1220℃以下的氧化產品,現在生產成本要比燃氣輥道窯低15%以上,但要一個200kva以上的變壓器、這個投資不小,對變壓器容量還有過剩的陶瓷廠,可在預熱帶或靠近燒成帶加裝電熱線用電熱來預熱升溫,高溫帶還是用燃氣,但電熱窯不能燒還原,對燒成1260℃以上對發熱體質量要求較高,價格較貴。1280℃以上燒成發熱體要用硅鉬棒。硅鉬棒容易老化、使用壽命不是太長。選用電熱窯爐要看電價,平均電價較低的地區可以選用電熱窯爐,在電價較高、液化氣的價格居高不下的情況下在原有窯爐上改裝電熱是合算的,但要保留原有燃氣功能。
   
    溫馨提醒:本網內容旨在傳播更多窯爐相關行業資訊,轉載或者分享請注明來自中國窯爐網。


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