1785-L20E
1785-L20E
1785-L20E
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除氧器系統(tǒng)主要是控制水箱水位和水溫，監(jiān)視除氧器壓力。控制系統(tǒng)采用AI調(diào)節(jié)器、 變頻器、氣動(dòng)薄膜調(diào)節(jié)閥等先進(jìn)的控制設(shè)備,對(duì)除氧器施行有效的控制,系統(tǒng)具有自動(dòng)/手動(dòng)切換功能、聲光報(bào)警提示等確保系統(tǒng)的安全運(yùn)行，采用變頻器對(duì)水泵進(jìn)行起停控制，實(shí)現(xiàn)給水的自動(dòng)調(diào)節(jié)。
1、控制回路：
除氧器溫度：用PT100測(cè)量水的溫度，通過(guò)溫度變化調(diào)節(jié)氣動(dòng)薄膜調(diào)節(jié)閥的開(kāi)度，改變蒸汽量的大小，使溫度保持在104度，調(diào)節(jié)器的型號(hào)為AI-808AX3L2L2。
2、系統(tǒng)調(diào)試
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福建光沃自動(dòng)化設(shè)備有限公司
聯(lián)系人 ：歐工（銷(xiāo)售經(jīng)理）
手機(jī) ：18030229053
電話 ：0592-5709825
QQ ：2479261344
郵箱 ：2479261344@qq.com
傳真 ：0592-5917519
信用=財(cái)富 誠(chéng)信=財(cái)富 共贏=財(cái)富
除氧器水位：采用單室平衡容器加差壓變送器的方法，可得到與水位成正比的4—20mA的電流信號(hào)，測(cè)量?jī)x表將該電流信號(hào)轉(zhuǎn)換為水位信號(hào)，直接在儀表上顯示水位的高低。 該水位信號(hào)同時(shí)作為自動(dòng)調(diào)節(jié)的水位測(cè)量信號(hào)，參與系統(tǒng)的自動(dòng)調(diào)節(jié)，調(diào)節(jié)器的型號(hào)為AI-808AI4X3L2L2。
AI調(diào)節(jié)器是這個(gè)系統(tǒng)的核心控制設(shè)備，它的控制效果直接影響整個(gè)系統(tǒng)的正常運(yùn)行。在沒(méi)有經(jīng)驗(yàn)控制參數(shù)的時(shí)候，為了達(dá)到最佳的控制效果，儀表要進(jìn)行PID自整定，但一般的調(diào)節(jié)儀表在自整定時(shí)的調(diào)節(jié)狀態(tài)是位式控制，輸出量要么最大要么最小，在系統(tǒng)中調(diào)節(jié)輸出大幅變化是不允許的。AI-808調(diào)節(jié)器具有手動(dòng)自整定模式可以很好的解決這個(gè)問(wèn)題，具體操作是：把儀表切換到手動(dòng)輸出狀態(tài)，通過(guò)儀表的△ ▽鍵調(diào)整輸出量，使測(cè)量值盡量和設(shè)定值保持一致，然后在這個(gè)狀態(tài)下啟動(dòng)自整定，這樣儀表的輸出值將限制在當(dāng)前手動(dòng)輸出值的±10%范圍內(nèi)，從而避免出現(xiàn)輸出值的大幅變化。在多數(shù)情況下，自整定一次就可以使獲得滿意的控制效果。如果控制有偏差時(shí)，可以通過(guò)微調(diào)M5、P、T參數(shù)來(lái)修正。水位控制的PID參數(shù)取CTRL=4、M5=4、P=5、T=1。溫度控制的PID參數(shù)最好是通過(guò)自整定來(lái)取得，除氧器壓力在0.012-0.02 MPa時(shí)，如果溫度還達(dá)不到104度，可以通過(guò)調(diào)節(jié)蒸汽旁路閥來(lái)加熱，使溫度達(dá)到104度。
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