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IC697CPM790

IC697CPM790

IC697CPM790

IC697CPM790

②當(dāng)鍋爐不參與母管壓力調(diào)節(jié)時(shí)，采用主汽壓力作為主要的被調(diào)量進(jìn)入PI調(diào)節(jié)器，形成給氣指令。設(shè)計(jì)中考慮到變負(fù)荷工況時(shí)主汽流量先變化，因此在鍋爐不參與母管壓力調(diào)節(jié)的情況下用它作為表征負(fù)荷的參量，與送風(fēng)系統(tǒng)配合實(shí)現(xiàn)“增負(fù)荷時(shí)先增風(fēng)后增氣；減負(fù)荷時(shí)先減氣后減風(fēng)”的設(shè)計(jì)原則。
汽機(jī)控制系統(tǒng)
因母管制機(jī)組大多為用汽機(jī)組，因此對(duì)于汽機(jī)的控制一般分為“以熱定電”或“以電定熱”兩種。在汽機(jī)采用DEH系統(tǒng)控制時(shí)，DEH系統(tǒng)將通過功率控制回路和壓力控制回路給出汽機(jī)對(duì)蒸汽需求。
1.1.2.2 燃料控制系統(tǒng) 
燃料控制系統(tǒng)是接受①的輸出還是接受②的輸出指令由運(yùn)行人員來選擇。
表征煤氣量的參數(shù)主要有煤氣的流量和煤氣壓力，這些參數(shù)與鍋爐控制系統(tǒng)的輸出指令，實(shí)現(xiàn)燃料量調(diào)節(jié)。燃料調(diào)節(jié)采用調(diào)節(jié)進(jìn)氣閥門擋板來實(shí)現(xiàn)；它可以實(shí)現(xiàn)手動(dòng)、自動(dòng)控制進(jìn)氣閥門來保證母管壓力和汽包壓力為給定值，并向送風(fēng)控制回路發(fā)出聯(lián)鎖跟隨指令。
在高爐煤氣中，高爐煤氣的流率比較穩(wěn)定，而和流率變化較大，因此燃料量的控制主要通過調(diào)節(jié)高爐煤氣的進(jìn)氣量，同時(shí)通過調(diào)節(jié)高爐煤氣量來消除其它兩種煤氣的流量擾動(dòng)。


1.1.2.3 汽包水位控制系統(tǒng)
汽包水位帶汽包壓力的校正補(bǔ)償，主汽流量帶主汽壓力及溫度的補(bǔ)償，給水流量帶給水溫度的補(bǔ)償。為分程調(diào)節(jié)方式，單沖量及三沖量切換運(yùn)行。啟動(dòng)工況下，調(diào)節(jié)給水旁路調(diào)節(jié)門的開度來保證鍋爐給水量，調(diào)節(jié)設(shè)備為給水旁路調(diào)節(jié)門。在正常運(yùn)行時(shí)，調(diào)節(jié)鍋爐主給水調(diào)節(jié)門的開度來保證鍋爐給水量，調(diào)節(jié)設(shè)備為鍋爐主給水調(diào)節(jié)門。

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