推荐几个靠谱的手赚平台

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漂珠
添加時間:2014-12-11 15:51:07

 

 

 一、漂珠的形成機理 燃煤電廠多將煤炭磨成煤粉,送入爐膛讓其懸浮燃燒。煤的可燃成分(炭和有機物)大部分燃燒,而粘土質不可燃成分(硅、鋁、鐵、鎂等)在爐膛攝氏1300度的高溫下開始熔融,形成石英玻璃和莫來石多孔共生體,其孔內充滿氣體。當爐溫達到攝氏1400度時,熔融體顆粒表面張力會使表面能降到最低值,棱角擺脫表面能而收縮,熔融顆粒會飄浮滾動形成球體。這時,多孔體內的氣體如CO、CO2、N2、H2等被包裹在球內。 當爐溫繼續升高時,玻璃球體內的氣體膨脹,使球體增大,外殼變薄,形成中空球體。當中空球體離開爐膛,急速冷卻后,就變成了堅硬外殼的玻璃微珠。這些玻璃微珠,因壁厚及輕重不同,可分為兩類。其中一類是薄壁中空球體(壁厚為直徑的十分之一),因可漂水上,就稱為“漂珠”。另一類是壁厚中空球體(壁厚為直徑的三分之一)和實心球體,因較重而沉于水底,故稱“沉珠”,含鐵量高的稱為“磁珠”。 漂珠在粉煤灰中含量甚微,一般僅為0.2-0.5%,少數可達1%,沉珠量很大,約為粉煤灰的30-70%。漂珠的產量和質量,跟煤種、煤的細度、鍋爐負荷、燃燒狀況等因素有關。各電廠之間、一個電廠不同鍋爐之間、一個鍋爐不同時間,均有極大差別。一般發熱量高、含硫量低的煙煤,漂珠量多:無煙煤漂珠少,褐煤漂珠極少甚至無漂珠。爐膛內溫度低于攝氏1400度,很少形成漂珠:攝氏1400-1500度,形成漂珠多,攝氏1500度以上,形成的漂珠會爆裂成碎片。因此爐溫過高或過低都會影響漂珠的形成。 燃煤電廠多將煤炭磨成煤粉,噴入發電鍋爐的爐膛,讓其懸浮燃燒。得到產物其中一類是薄壁中空球體(壁厚為直徑的十分之一),因可漂水上,就稱為“漂珠”。另一類是壁厚中空球體(壁厚為直徑的三分之一)和實心球體,因較重而沉于水底,故稱“沉珠”,含鐵量高的稱為“磁珠”。 漂珠的產量和質量,跟煤種、煤的細度、鍋爐負荷、燃燒狀況等因素有關。各電廠之間、一個電廠不同鍋爐之間、一個鍋爐不同時間,均有極大差別。一般發熱量高、含硫量低的煙煤,漂珠量多:無煙煤漂珠少,褐煤漂珠極少甚至無漂珠。爐膛內溫度低于攝氏1400度,很少形成漂珠:攝氏1400-1500度,形成漂珠多,攝氏1500度以上,形成的漂珠會爆裂成碎片。因此爐溫過高或過低都會影響漂珠的形成.

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  5.電絕緣性優異:選去磁珠后的漂珠,是性能優異的絕緣材料,不導電。一般絕緣體的電阻均隨溫度的升高而降低,漂珠則相反,隨溫度的升高電阻增大。這一優點是其他絕緣材料都不具備的。所以,它可以制作高溫條件下的絕緣制品。因此利用漂珠這一優勢,國內外生產出幾十種漂珠輕質保溫隔熱制品,如輕質燒結耐火磚、輕質免燒耐火磚、鑄造保溫冒口、管道保溫外殼、防火保溫涂料、保溫隔熱膏、復合隔熱干粉、輕質保溫耐磨玻璃鋼、塑料活化填充劑、高溫高壓絕緣體等,并在衛星、飛船、火箭、軍工、電子等高科技領域得到廣泛應用。特別是用它生產輕質耐火磚,暢銷國內外,供不應求,有市無貨,價格一再上升,它占有輕質耐火磚市場的70%的份額。隨著漂珠優點逐漸被人認識,它的用途會越來越廣,用量會越來越大。http://kaihanwr.com

 

 

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