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    6FX1120-2CA02
    發(fā)布者:工控備件  發(fā)布時(shí)間:2019-08-18 15:36:33  訪問次數(shù):313

    6FX1120-2CA02現(xiàn)貨 in stock! 歡迎來電咨詢~!!

    6FX1120-2CA02


     廣州地鐵三號(hào)線集中冷站系統(tǒng)構(gòu)成及特點(diǎn)
      廣州地鐵三號(hào)線集中冷站采用了施耐德高端PL C QUANTUM 控制器系列,對(duì)集中冷站和車站進(jìn)行控制,各車站與集中冷站之間采用多模光纖以太網(wǎng)通訊方式,通訊協(xié)議為MODBUS TCP .大大保證了通訊速率和通訊信息量的要求,同時(shí)也保證了通訊距離和系統(tǒng)的安全可靠性。送排風(fēng)及空調(diào)系統(tǒng)采用變頻器調(diào)節(jié)風(fēng)量,水系統(tǒng)二次泵也均采用變頻器調(diào)節(jié)。變頻器與通過Modbus通訊接口接入就地遠(yuǎn)程I/O箱的遠(yuǎn)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(tǒng)構(gòu)成
      ○ 集中冷站供冷系統(tǒng)由集中冷站,傳輸管道和末端設(shè)備構(gòu)成
      ○ 其中供冷系統(tǒng)圖如圖1-1,冷站系統(tǒng)圖如圖1-2
    集中冷站系統(tǒng)特點(diǎn)
      與分站供冷方式相比,集中冷站供冷系統(tǒng)需要為多個(gè)車站供冷,在供冷范圍和數(shù)量上都要大得多,有以下幾個(gè)主要特點(diǎn):
      ● 冷凍水傳輸距離長(zhǎng)。一般地鐵站距在1000米左右,本系統(tǒng)為6個(gè)車站供冷,冷凍水傳輸距離將達(dá) 2000~3000米。長(zhǎng)距離傳輸,管路的阻力大為增加,并且系統(tǒng)的熱惰性加大,增大了系統(tǒng)的調(diào)節(jié)難度
      ● 末端設(shè)備數(shù)量多,供冷管路形成網(wǎng)絡(luò)。由于各站的負(fù)荷情況不同,系統(tǒng)調(diào)節(jié)時(shí)易導(dǎo)致出現(xiàn)相互影響,需考慮整個(gè)網(wǎng)絡(luò)的整體水力平衡
      ● 集中冷站供冷系統(tǒng)的制冷部分,通常采用多機(jī)組,二級(jí)泵的形式。這種形式適應(yīng)了長(zhǎng)距離管路輸送阻力較大的情況,能夠減小末端系統(tǒng)對(duì)冷機(jī)的影響。但是增加了泵的數(shù)量和管路復(fù)雜性,使調(diào)節(jié)控制的難度加大
      調(diào)節(jié)控制方法與策略
      調(diào)節(jié)控制手段
      ● 廣州地鐵三號(hào)線集中供冷系統(tǒng)中,PLC采用的調(diào)節(jié)控制手段有:
      ○ 風(fēng)機(jī)變頻變風(fēng)量(末端設(shè)備)
      ○ 水泵變頻變水量
     ○ 水閥調(diào)水量
      ○ 質(zhì)調(diào)節(jié)
      調(diào)控手段的選擇
      由于管路很長(zhǎng),冷凍水從集中冷站到末端設(shè)備需要運(yùn)行數(shù)十分鐘,如果采用質(zhì)調(diào)節(jié),則調(diào)節(jié)時(shí)滯太大。因此在實(shí)時(shí)控制中,主要采用量調(diào)節(jié)的方式(包括風(fēng)量調(diào)節(jié)和水量調(diào)節(jié))。質(zhì)調(diào)節(jié)則采用開環(huán)方式,根據(jù)外溫或季節(jié)確定冷凍水溫,并在一定時(shí)間內(nèi)(比如1天內(nèi))保持相對(duì)穩(wěn)定。
      二級(jí)泵管路長(zhǎng),阻力大,且流量直接受末端負(fù)荷的影響,因此二級(jí)泵采用變頻調(diào)節(jié),可以達(dá)到較好的節(jié)能效果。同時(shí)為了保證通過冷水機(jī)組的水量,一級(jí)泵采用定速泵,并與冷機(jī)對(duì)應(yīng)運(yùn)行,不進(jìn)行變頻調(diào)節(jié)。
      從節(jié)能的角度考慮,優(yōu)先考慮節(jié)能效果較好的風(fēng)機(jī)變頻和水泵變頻調(diào)節(jié),盡量少使用水閥調(diào)水量的方法。
      控制調(diào)節(jié)的策略
      初調(diào)節(jié)
      集中冷站供冷的管路復(fù)雜,不同支路之間的阻力差距大,因此需要進(jìn)行認(rèn)真的系統(tǒng)初調(diào)節(jié),以免系統(tǒng)水力失調(diào),導(dǎo)致運(yùn)行調(diào)節(jié)無法正常進(jìn)行。
      ● 初調(diào)節(jié)目標(biāo):
      ○ 驗(yàn)證系統(tǒng)可以達(dá)到設(shè)計(jì)工況
      ○ 實(shí)現(xiàn)系統(tǒng)的水力平衡,為運(yùn)行調(diào)節(jié)準(zhǔn)備條件。
      ● 調(diào)節(jié)步驟
      經(jīng)多次調(diào)整,使系統(tǒng)內(nèi)各機(jī)組的流量基本相同(如機(jī)組型號(hào)不同,則各機(jī)組的流量比值應(yīng)基本相同。流量比值=實(shí)際流量/設(shè)計(jì)流量)。且至少1個(gè)機(jī)組的閥門為全開狀態(tài)。
      1、調(diào)整一級(jí)泵系統(tǒng)水力平衡
      2、設(shè)計(jì)頻率整定

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來源:工控備件
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