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1762-L24BXBR
1762-L24BXBR
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  • 規格:1762-L24BXBR
  • 發貨地:福州
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    商鋪名稱:福州聚福興自動化有限公司

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      1762-L24BXBR


       廣州地鐵三號線集中冷站系統構成及特點
        廣州地鐵三號線集中冷站采用了施耐德高端PL C QUANTUM 控制器系列,對集中冷站和車站進行控制,各車站與集中冷站之間采用多模光纖以太網通訊方式,通訊協議為MODBUS TCP .大大保證了通訊速率和通訊信息量的要求,同時也保證了通訊距離和系統的安全可靠性。送排風及空調系統采用變頻器調節風量,水系統二次泵也均采用變頻器調節。變頻器與通過Modbus通訊接口接入就地遠程I/O箱的遠程通訊模塊上,大大減少了通訊線的距離,避免了干擾。
        ● 集中冷站系統構成
        ○ 集中冷站供冷系統由集中冷站,傳輸管道和末端設備構成
        ○ 其中供冷系統圖如圖1-1,冷站系統圖如圖1-2
      集中冷站系統特點
        與分站供冷方式相比,集中冷站供冷系統需要為多個車站供冷,在供冷范圍和數量上都要大得多,有以下幾個主要特點:
        ● 冷凍水傳輸距離長。一般地鐵站距在1000米左右,本系統為6個車站供冷,冷凍水傳輸距離將達 2000~3000米。長距離傳輸,管路的阻力大為增加,并且系統的熱惰性加大,增大了系統的調節難度
        ● 末端設備數量多,供冷管路形成網絡。由于各站的負荷情況不同,系統調節時易導致出現相互影響,需考慮整個網絡的整體水力平衡
        ● 集中冷站供冷系統的制冷部分,通常采用多機組,二級泵的形式。這種形式適應了長距離管路輸送阻力較大的情況,能夠減小末端系統對冷機的影響。但是增加了泵的數量和管路復雜性,使調節控制的難度加大
        調節控制方法與策略
        調節控制手段
        ● 廣州地鐵三號線集中供冷系統中,PLC采用的調節控制手段有:
        ○ 風機變頻變風量(末端設備)
        ○ 水泵變頻變水量
       ○ 水閥調水量
        ○ 質調節
        調控手段的選擇
        由于管路很長,冷凍水從集中冷站到末端設備需要運行數十分鐘,如果采用質調節,則調節時滯太大。因此在實時控制中,主要采用量調節的方式(包括風量調節和水量調節)。質調節則采用開環方式,根據外溫或季節確定冷凍水溫,并在一定時間內(比如1天內)保持相對穩定。
        二級泵管路長,阻力大,且流量直接受末端負荷的影響,因此二級泵采用變頻調節,可以達到較好的節能效果。同時為了保證通過冷水機組的水量,一級泵采用定速泵,并與冷機對應運行,不進行變頻調節。
        從節能的角度考慮,優先考慮節能效果較好的風機變頻和水泵變頻調節,盡量少使用水閥調水量的方法。
        控制調節的策略
        初調節
        集中冷站供冷的管路復雜,不同支路之間的阻力差距大,因此需要進行認真的系統初調節,以免系統水力失調,導致運行調節無法正常進行。
        ● 初調節目標:
        ○ 驗證系統可以達到設計工況
        ○ 實現系統的水力平衡,為運行調節準備條件。
        ● 調節步驟
        經多次調整,使系統內各機組的流量基本相同(如機組型號不同,則各機組的流量比值應基本相同。流量比值=實際流量/設計流量)。且至少1個機組的閥門為全開狀態。
        1、調整一級泵系統水力平衡
        2、設計頻率整定

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