系統(tǒng)組成 循環(huán)水泵是燃機(jī)電廠的主要輔機(jī)之一，其正常出力對(duì)電站的安全正常運(yùn)行有重要意義循環(huán)水泵的控制歷來(lái)是電站控制中的重要問題。 燃機(jī)循泵系統(tǒng)由以下結(jié)構(gòu)組成，如圖1。 [align=center]
圖1 燃機(jī)循環(huán)系統(tǒng)[/align] 兩臺(tái)循環(huán)水泵分別抽取通過(guò)欄污柵的海水，并入一根循環(huán)水母管，經(jīng)過(guò)二次濾網(wǎng)再次過(guò)濾，送入汽機(jī)凝汽器循環(huán)水系統(tǒng)。由于循泵出口無(wú)法安裝逆止閥，每臺(tái)循泵后都有出口液壓蝶閥作為循環(huán)水管和循泵的隔離，防止倒水。循泵的冷卻水用于循泵電機(jī)冷卻，采用閉式循環(huán)，經(jīng)過(guò)冷卻水箱，通過(guò)3臺(tái)2運(yùn)1備的冷卻水泵分兩路分別對(duì)循泵電機(jī)進(jìn)行冷卻。 可編程控制器（Programmable Logic Controller），簡(jiǎn)稱為PLC，由于其高可靠性，便捷的通訊接口，簡(jiǎn)易方便的安裝設(shè)計(jì)等特點(diǎn)，廣泛的應(yīng)用于各種工業(yè)邏輯控制領(lǐng)域。燃機(jī)循泵控制系統(tǒng)也采用了以微處理為基礎(chǔ)的可編程控制器和工控機(jī)構(gòu)成監(jiān)控系統(tǒng)。控制方式采用CRT操作員站進(jìn)行監(jiān)視控制，通過(guò)CRT畫面和鍵盤對(duì)整個(gè)工藝系統(tǒng)進(jìn)行監(jiān)視和控制，實(shí)現(xiàn)對(duì)循環(huán)水系統(tǒng)的數(shù)據(jù)采集，處理，圖象顯示，報(bào)警，制表和自動(dòng)順序控制，完成相關(guān)輔助系統(tǒng)的調(diào)節(jié)功能及局部系統(tǒng)的邏輯控制和聯(lián)鎖保護(hù)。根據(jù)目前的運(yùn)行管理情況及考慮今后的管理發(fā)展方象，程序控制系統(tǒng)及被控設(shè)備均按有人和無(wú)人化值班方式設(shè)計(jì)和配置，并預(yù)留遠(yuǎn)程通訊接口以備今后與其他控制系統(tǒng)實(shí)現(xiàn)數(shù)據(jù)通訊和遠(yuǎn)方監(jiān)控。
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