據(jù)已經(jīng)為超超臨界燃煤發(fā)電機組提供過屏蔽控制電纜的電纜廠家稱,現(xiàn)代火電廠的DCS控制系統(tǒng)結(jié)構(gòu)復(fù)雜而精密,對控制電纜的屏蔽系數(shù)要求很高;尤其是控制電纜絕緣線芯的截面很小,ECPA81-2導(dǎo)體規(guī)格幾乎全是1.5mm2,在制造過程中,很容易發(fā)生導(dǎo)體被拉細或拉斷、鋁箔斷裂脫節(jié)等缺陷,因此需要特別注意,并且一定做導(dǎo)通試驗。(南方電纜網(wǎng)羅惠)
小資料:
1)超臨界火力發(fā)電機組
所謂超臨界機組是指主蒸汽壓力大于水的臨界壓力22.12兆帕的機組,而ECPA81-2亞臨界機組通常指出口壓力在15.7~19.6兆帕的機組。習(xí)慣上,又將超臨界機組分為兩個層次:一是常規(guī)超臨界參數(shù)機組,其主蒸汽壓力一般為24兆帕左右,主蒸汽和再熱蒸汽溫度為540~560℃;二是超超臨界機組,其主蒸汽壓力為25~35兆帕及以上,主蒸汽和再熱蒸汽溫度一般580℃以上。
2)超臨界火力發(fā)電機組的DCS控制系統(tǒng)
ECPA81-2超臨界火力發(fā)電機組采用的DCS控制系統(tǒng),又稱分散控制系統(tǒng)、分散型控制系統(tǒng)或集散控制系統(tǒng)。電力行業(yè)內(nèi)習(xí)慣上稱為4C控制系統(tǒng),即把控制技術(shù)、計算機技術(shù)、通信技術(shù)和顯示技術(shù)合為一體的一體化控制系統(tǒng)。
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