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    篩碎設備 1 常用的篩分和破碎設備形式有哪些? 答:常有的篩分設備有:固定篩、滾筒篩、共振篩、滾軸篩、振動篩、鏈條篩、概率篩。 常用的破碎設備有:反擊式碎煤機、錘擊式碎煤機、雙齒輥碎煤機、顎式碎煤機、環式重型碎煤機等。 2 燃煤火電廠為什么要對燃煤進

    來源:未知 閱讀次數:
      篩碎設備
    1   常用的篩分和破碎設備形式有哪些?
    答:常有的篩分設備有:固定篩、滾筒篩、共振篩、滾軸篩、振動篩、鏈條篩、概率篩。
            常用的破碎設備有:反擊式碎煤機、錘擊式碎煤機、雙齒輥碎煤機、顎式碎煤機、環式重型碎煤機等。
    2   燃煤火電廠為什么要對燃煤進行篩分和破碎?
    答:燃煤火電廠對燃煤進行篩分是為了減輕碎煤機的負擔,減少碎煤機電耗和防止碎煤機堵塞。對燃煤進行破碎是為了減少大塊煤對輸煤膠帶的磨損,減少落煤管堵煤的機會和設備損壞機會,減少鍋爐給煤機和磨煤機的磨損,提高制粉系統效率,有利于燃煤火電廠的經濟運行和降低廠用電率。
    3   衡量篩煤設備的主要性能指標有哪些?
        答:篩分量和篩分效率是煤篩的兩項主要性能指標。
    4   何謂篩分效率?影響篩分效率的主要因素有哪些?
    答:篩分效率是指通過篩網的小顆粒煤的含量與進入煤篩同一級粒度煤的含量之比。
            影響篩分效率的主要因素有:篩網長度、篩網傾角、物料特性、物料層厚度、煤篩出力和篩網結構等。
    5   碎煤機在帶負荷運行4小時后,對軸承溫度有和要求?
        答:碎煤機在帶負荷運行4小時后,其軸承溫度應不超過75°C。
    6   環式碎煤機的環錘的旋轉軌跡與篩板之間的間隙應為多少?
        答:其間隙一般為20∽25mm。
    7   環式碎煤機的工作原理是什么?
    答:環式碎煤機主要破碎過程可分為沖擊、劈剪、擠壓、折斷、滾碾幾個過程,由于高速回轉的轉子環錘的作用,使煤在環錘與碎煤板、篩板之間,煤與煤之間產生沖擊力、劈剪力、剪切力、擠壓力、滾碾力,這些力大與或超過煤在碎裂處碎裂前所固有的抗沖擊載荷以及抗壓、抗拉強度極限時,煤就會破碎。
    8   概率篩的基本工作原理是什么?
    答:其工作原理是利用物料顆粒越小越容易穿過篩孔,而與篩孔尺寸接近或比篩孔   
    大的顆粒不容易穿過篩孔的概率統計原理進行篩分的。
    9   篩碎設備旁路的作用是什么?
    答:篩碎設備旁路首先是篩碎設備的事故備用,篩碎設備事故時,通過擋板倒換而保證輸煤任務的完成。而當煤粒度已基本滿足鍋爐要求時,亦可停下篩碎設備使用旁路,節約廠用電,降低發電成本。
    10  環式碎煤機的主要結構有哪些?
    答:由機體、機蓋、反射板、搖臂、篩板及其調節器、撥煤板、齒環錘、平環錘、主軸、碎煤板等組成。
    11  環式碎煤機的主要特點是什么?
        答:(1)破碎量大、功率大、效率高;(2)結構簡單緊湊、占地小、剛度大、重量輕;(3)排料粒度小于30mm且均勻;(4)環錘可以自由擺動,遇到煤中鐵塊等雜物時,可徑向退縮讓雜物通過,經過撥料器作用,雜物被反射到除鐵室;(5)無鼓風作用、機內空間小、風量小、無煤塵泄露飛揚;(6)運行可靠且調整容易方便,有液壓開啟機蓋裝置。檢修方便,維護工作量小,煤種適應性強;(7)工作噪音小、振動小、使用壽命長。
    12  破碎設備的主要破碎形式有哪些?
        答:打擊、擠壓、劈裂、碾磨是破碎設備的主要破碎形式。
    13  衡量破碎效果的主要指標時什么?
        答:衡量破碎效果的主要指標是生產能力和破碎比。
    14  慣性共振概率篩的主要構造有哪些?
        答:慣性共振概率篩主要由篩箱、激振器裝置、隔振彈簧及其它裝置組成。
    15  清理概率篩堵煤和停運清掃時應注意什么?
    答:(1)必須在上段膠帶停運后才能打開人孔門,用專用工具在外清理堵煤,嚴禁入內進行清理工作。必須入內清理時,應在進入前做好可靠安全措施,嚴禁啟動下段膠帶。清理過程中要防止塌方傷人;(2)停運清理時,應先將上部擋板打到旁路位置,并通知下段膠帶不準啟動和向落煤管內清理雜物;(3)清理結束后把檢查梯鎖好,人孔門關閉,擋板恢復原位,拆除臨時安全措施。
    16  慣性共振概率篩接班和啟動前應檢查的內容有哪些?
    答:(1)各部螺絲沒有松動;(2)篩條應張緊,無折斷和彎曲變形,篩面無雜物和堵塞現象;(3)重吊鋼絲繩無斷開和斷股,上下密封尼龍帆布應無漏洞和開裂現象,檢查門應完好、門栓應牢固;(4)各潤滑點潤滑良好;(5)電話、照明工具以及現場設施應齊全、完好。
    17  慣性共振概率篩運行中的注意事項有哪些? 
        答:(1)運行中給煤應均勻、無過大震動、響聲應平穩;(2)運行中應經常檢查振動電機的地腳螺絲有無松動現象,電機溫度不得超過75°C,發現問題應及時通知處理;(3)運行中禁止打開檢查門;(4)振幅過小時應及時聯系調整。
    18  環式碎煤機接班和啟動前應檢查的內容有哪些?
        答:(1)各部螺絲不能松動,焊縫沒有開焊,檢查門應能關閉,門銷完整牢固;(2)篩板與錘環間隙應合適,盤車應無摩擦和卡碰現象;(3)各潤滑點應保持足夠的潤滑油;(4)碎煤層無積煤和雜物,照明和各附屬裝置完好。
    19  環式碎煤機啟動時應注意的事項有哪些?
        答:(1)停運24小時以上,啟動時應測電機絕緣;(2)認真檢查,確認符合啟動條件;(3)啟動時應注意電流表,發現長時間電流不回空載電流或聽到異音、強烈振動、電機轉不動等,應立即停機檢查處理;(4)啟動空轉正常后,通知下段膠帶啟動。
    20  環式碎煤機運行中應注意的事項有哪些?
        答:(1)發現長時間電流超過額定值時立即停機;(2)振動超過1mm時停機檢查;(3)如出現異常振動、噪音及強烈撞擊聲時,應及時查明原因,必要時停機檢查處理;(4)各部溫度不超溫;(5)運行中發現上段膠帶停運,應立即通知下段膠帶停運;(6)發現落煤管堵煤,電機不轉時立即停機;(7)運行中嚴禁打開人孔門,做一切運行維護工作;(8)停運時,應待膠帶停運、機內煤拉空后,方可停止運行;(9)注意負荷變化,大煤塊多、硬度大、雜物多時,應適當減少負荷。
    21  怎樣調整概率篩振幅?其額定振幅為多少?運行中怎樣觀察振幅?
    答:概率篩的振幅是指概率篩工作過程中篩箱振動的幅度,振幅一般為5mm。運行中可觀察概率篩的振幅表,眼與表需處在同一水平位置,以免增加人為誤差。
            調整振幅的方法:把振動電機兩端罩打開,松開兩偏心塊固定螺釘,改變兩偏心塊的重合角即可,但兩臺振動電機四組偏心塊必須作同時調整。調整后偏心塊固定螺釘必須擰緊,最大振幅不超過6mm。
    22  環式碎煤機環錘與篩板的間隙如何調整?
    答:環錘與篩板的間隙大小決定于破碎粒度大小(適宜的間隙也可以減少環錘與篩板的磨損)。整個使用過程中,可根據破碎粒度及出力大小的變化隨時調整間隙。該間隙的調整應在開機無負荷下進行:首先用專用扳手轉動調整絲桿,將活動篩板提起,當聽到機內有沙沙撞擊聲后,即停止調整;然后反轉絲桿,退回1~2扣螺距即可(一般新更換的環錘和篩板,使螺紋絲桿外露250mm為宜)。
    23  環式碎煤機生產力明顯下降的原因及處理方法是什么?
        答:原因:(1)篩板柵孔堵塞;(2)入料口堵塞;(3)環錘磨損嚴重,效率降低; (4)給料不均勻。
            處理:(1)停機清理柵孔堵塞;(2)停機清理入料口;(3)聯系機械檢修換錘;   (4)調整給料機構。
    24  環式碎煤機啟動時轉不動或達不到額定轉速的原因及處理方法是什么?
        答:原因:(1)電氣回路故障;(2)機內堵塞。
            處理:(1)通知電氣負責人員處理;(2)停機清理機內堵煤。
    25  環式碎煤機停機時惰走時間短的原因是什么?
        答:原因:(1)轉子不平衡;(2)軸承磨損。
            處理:(1)聯系機械檢修處理;(2)聯系機械檢修更換軸承。
    26  環式碎煤機內產生連續敲擊聲的原因及處理方法是什么?
        答:原因:(1)不易破碎雜物進入機內;(2)環錘與篩板間隙調整不當;(3)搖臂磨損,環錘竄動。
           處理:(1)停機清理機內雜物;(2)聯系機械檢修調整間隙;(3)聯系機械檢修更換搖臂。
    26  概率篩運行中出現強烈振動,猶如金屬撞擊聲,振幅及電流擺動大的原因是什么?
    答:(1)減振吊桿、鋼絲繩斷裂或松動,造成箱體不平衡,振動時與固定部件相撞擊;(2)電動機底座松動,造成振動時電機底座與箱體相撞擊;(3)單電機運行,造成振動不平衡;(4)兩臺振動電動機調整不平衡,造成振動不平衡。
    28  環式碎煤機振動大的原因有哪些? 
        答:(1)錘環及環軸失去平衡;(2)錘環折斷失去平衡;(3)軸承座內間隙過大;(4)聯軸器與軸、電機軸安裝不緊密,不同軸度過大;(5)給料不均勻造成磨損不均勻,失去平衡;(6)碎煤機內進入鐵塊;(7)地腳螺絲松動。
    29  環式碎煤機排料粒度明顯增大的原因有哪些?
        答:(1)篩板與錘環間隙過大;(2)篩板柵孔有折斷處;(3)錘環磨損過大。
    30  碎煤機軸承過熱的原因有哪些?
        答:(1)軸承保持架或鎖套損壞;(2)滾動軸承游隙過小;(3)潤滑脂內有雜物;(4)潤滑脂不足。
    31  慣性共振概率篩振幅減小的原因有哪些?
    答:(1)皮帶磨損變松;(2)篩箱內堵死或負荷過大;(3)平衡塊偏角過大。
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