140DAI45300

汽輪機(jī)通常采用定－滑－定啟動(dòng)模式。汽輪機(jī)啟動(dòng)階段，鍋爐燃燒率維持不變。汽輪機(jī)所需的啟動(dòng)蒸汽壓力由旁路系統(tǒng)控制，維持不變。蒸汽溫度由鍋爐溫控系統(tǒng)控制，維持不變。機(jī)組并網(wǎng)帶負(fù)荷且旁路閥全關(guān)后，逐漸增加鍋爐燃燒率，蒸汽升溫、升壓，滑參數(shù)加負(fù)荷。正常運(yùn)行時(shí)，可由汽機(jī)或鍋爐維持蒸汽壓力不變，鍋爐溫控系統(tǒng)維持蒸汽溫度不變，通過(guò)改變汽機(jī)的調(diào)門(mén)、鍋爐燃燒率和給水量，以滿足電網(wǎng)對(duì)發(fā)電機(jī)功率的要求。

在ATC方式下，若機(jī)組的某些主要運(yùn)行參數(shù)超出正常范圍，系統(tǒng)將發(fā)出報(bào)警信號(hào)及保持指令。若熱應(yīng)力計(jì)算有效，系統(tǒng)將給出建議的負(fù)荷率。

1)      升速控制

根據(jù)機(jī)組熱狀態(tài)，可控制機(jī)組全自動(dòng)按經(jīng)驗(yàn)曲線完成升速率設(shè)置、暖機(jī)、過(guò)臨界轉(zhuǎn)速區(qū)，直到3000r/min定速。操作員可通過(guò)修改目標(biāo)轉(zhuǎn)速、升速率或按保持按鈕，對(duì)升速過(guò)程進(jìn)行手動(dòng)控制。在ATC方式下，系統(tǒng)根據(jù)機(jī)組熱應(yīng)力及機(jī)組運(yùn)行參數(shù)，可自動(dòng)給出保持指令，以控制啟動(dòng)過(guò)程。

2)      同期并網(wǎng)

DEH可與自動(dòng)準(zhǔn)同期裝置配合，將機(jī)組轉(zhuǎn)速調(diào)整到與電網(wǎng)同步的轉(zhuǎn)速，以便迅速完成并網(wǎng)操作。并網(wǎng)時(shí)，發(fā)電機(jī)自動(dòng)帶上初負(fù)荷。

3)      負(fù)荷控制

機(jī)組并網(wǎng)后，系統(tǒng)可在閥控、功控、壓控及CCS方式間無(wú)擾切換。

在閥控方式下，可設(shè)置目標(biāo)閥位和閥位變化率，改變汽輪機(jī)調(diào)節(jié)閥的開(kāi)度，從而調(diào)整機(jī)組負(fù)荷。

140DAI45300

_________________________________________ 
〖廈門(mén)光沃自動(dòng)化設(shè)備有限公司 竭誠(chéng)為您服務(wù)〗   
〖：歐工         〗
〖(同號(hào))       〗
〖:  2479261344     〗
〖  
【價(jià)格】如此低價(jià),* 
【貨期】大量現(xiàn)貨,下單后即可發(fā)貨
【質(zhì)量】*,進(jìn)口***
【保障】產(chǎn)品經(jīng)過(guò)專業(yè)檢測(cè)，質(zhì)保一年,15天包退換
【品牌】Allen-Bradley羅克韋爾、ABB、本特利Bently 3500系統(tǒng)卡件、GE、艾默生西屋等模塊卡件
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