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plc在電除塵系統(tǒng)中主要作用是控制所有低壓設(shè)備自動(dòng)運(yùn)行和遠(yuǎn)程監(jiān)控高壓整流供電設(shè)備，對(duì)低壓設(shè)備的控制一般都有現(xiàn)場(chǎng)手動(dòng)和遠(yuǎn)程自動(dòng)兩種控制方式，所控制的設(shè)備包括陰極振打、陽極振打、灰斗卸灰閥電機(jī)、倉壁振動(dòng)器、絕緣子保溫梁電加熱器、灰斗保溫電加熱器、灰斗料位計(jì)、煙氣進(jìn)出口溫度顯示、絕緣子保溫梁溫度顯示、聲波清灰裝置、輸灰系統(tǒng)、高壓供電設(shè)備安全聯(lián)鎖以及遠(yuǎn)程監(jiān)控等[2](見圖3)。下面對(duì)自動(dòng)控制方式進(jìn)行簡要介紹。
廈門岳航計(jì)算機(jī)工程有限公司
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4.1陰、陽極振打的控制
電除塵器的陰、陽極振打都是由電機(jī)通過傳動(dòng)軸將動(dòng)力傳給陰、陽極振打機(jī)構(gòu)，使陰極線、陽極板上的積灰振落到灰斗中。plc系統(tǒng)通過控制器中的時(shí)間繼電器控制陰、陽極振打電機(jī)按照一定的時(shí)間規(guī)律相互配合運(yùn)行，并根據(jù)振打電機(jī)對(duì)應(yīng)的接觸器和熱繼電器的返回信號(hào)對(duì)電機(jī)狀態(tài)進(jìn)行監(jiān)控和保護(hù)。陰、陽極振打的一般控制規(guī)律為：一電場(chǎng)的陰、陽極振打周期*短，以后的各個(gè)電場(chǎng)振打周期逐漸加長，具體時(shí)間需根據(jù)電除塵器剛投產(chǎn)時(shí)的測(cè)試情況及工藝參數(shù)進(jìn)行確定;以24小時(shí)為總振打周期，夜間運(yùn)行周期要比白天運(yùn)行周期短[3];陰、陽極振打相互配合運(yùn)行，但振打周期各自獨(dú)立計(jì)算，陽極振打要比陰極運(yùn)行時(shí)間長、強(qiáng)度大;振打反饋信號(hào)只起狀態(tài)監(jiān)視和保護(hù)作用，不加入周期運(yùn)行控制當(dāng)中;為節(jié)約能源，振打運(yùn)行反饋信號(hào)與高壓整流供電設(shè)備有聯(lián)鎖，當(dāng)大量振打運(yùn)行時(shí)，高壓整流供電設(shè)備低電壓運(yùn)行或停止，以實(shí)現(xiàn)降壓振打，此方式可節(jié)約大量能源。
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