PLC應(yīng)用于污水處理系統(tǒng)發(fā)布時(shí)間:13-01-21 來源: 上海智忱科技發(fā)展有限公司 點(diǎn)擊量:44486 更多
針對(duì)目前高速公路服務(wù)區(qū)污水處理效率較低,自動(dòng)化程度不高,人力成本較高等問題,江蘇某研究所和正航公司聯(lián)合對(duì)服務(wù)區(qū)污水處理系統(tǒng)進(jìn)行改造,目前正在試點(diǎn)階段,并準(zhǔn)備向全省的高速公路服務(wù)區(qū)推廣。
1、MDD071C-N-030-N2S-095PA0工藝流程
如上圖所示,污水由隔油池和化糞池通過進(jìn)水管,依次經(jīng)過粗格柵、細(xì)格柵,然后進(jìn)入調(diào)節(jié)池,由1#提升泵提升至SBR反應(yīng)池進(jìn)行曝氣生物處理,SBR周期運(yùn)行,一周期共8小時(shí),其中包括4個(gè)階段(①進(jìn)水階段,t=1.0h;②曝氣階段,t=5.0h;③靜置階段t=1.0h;④潷水器排水階段,t=1.0h)。SBR出水進(jìn)入中間池再由2#提升泵提升至混凝池,在混凝池由加藥泵添加混凝劑,混合進(jìn)入沉淀池,上清液出水排入邊溝。
其中,SBR池和混凝池、沉淀池,均設(shè)排泥管,并各設(shè)一電動(dòng)排泥閥,由污泥泵進(jìn)行定期排泥,排泥進(jìn)入污泥池,人工對(duì)污泥池進(jìn)行定期外排。
2、MDD071C-N-030-N2S-095PA0控制系統(tǒng)構(gòu)成
本系統(tǒng)中共有模擬量輸入5路,分別是隔油池、調(diào)節(jié)池、中間池配置的超聲波液位差測(cè)量 儀 表, SBR反應(yīng)池、污泥池配置的污泥界面 計(jì) 。模擬量輸出兩路,分別是1#、2#變頻器頻率。開關(guān)量輸入12個(gè),分別為1#提升泵(一用一備)故障,2#提升泵(一用一備)故障,1#、2#風(fēng)機(jī)故障,1#、2#變頻器故障,加藥泵故障,1#、2#、3#電動(dòng)排污泵故障。數(shù)字量輸出13個(gè),分別為1#提升泵(一用一備)運(yùn)行,2#提升泵(一用一備)運(yùn)行,1#、2#風(fēng)機(jī)運(yùn)行,1#、2#變頻器運(yùn)行,加藥泵運(yùn)行,1#、2#、3#電動(dòng)排污泵運(yùn)行,故障報(bào)警。模擬量采集的各項(xiàng)參數(shù)、用戶設(shè)定的各項(xiàng)參數(shù)、手動(dòng)/自動(dòng)切換、自動(dòng)啟動(dòng)/停止以及各設(shè)備獨(dú)立啟動(dòng)/停止由觸摸屏顯示、設(shè)定。
采用:CPU224XP一個(gè),數(shù)字量輸出模塊EM222-R8一個(gè),模擬量輸入輸出模塊EM235一個(gè)以及7寸觸摸屏一個(gè)。
3、MDD071C-N-030-N2S-095PA0控制要求
(1)隔油池控制
配置超聲波液位差測(cè)量?jī)x,如果隔油池中,測(cè)量值超過設(shè)定值警報(bào),表明隔油池管道已被堵塞,提醒工作人員需要人工疏通隔油池。
(2 )調(diào)節(jié)池1#提升泵的控制
當(dāng)?shù)竭_(dá)進(jìn)水時(shí)刻,調(diào)節(jié)池中檢測(cè)水位低于啟動(dòng)水位時(shí), 電動(dòng)水閥開啟,1#提升泵開泵運(yùn)作,水位降低到停泵水位時(shí),1#提升泵停止運(yùn)作。
(3) SBR 反應(yīng)池的控制
周期運(yùn)轉(zhuǎn)的SBR 反應(yīng)池,每周期分4階段:①進(jìn)水階段,t=1.0h;②曝氣階段,t=5.0h;③靜置階段t=1.0h;④潷水器排水階段,t=1.0h。其中,
①進(jìn)水階段控制:進(jìn)水電動(dòng)閥開啟,如調(diào)節(jié)池1#提升機(jī)組控制;
?、谄貧怆A段控制:主要是根據(jù)進(jìn)水量,來控制曝氣量,通過風(fēng)機(jī)的恒壓變頻來實(shí)現(xiàn)風(fēng)機(jī)流量的變化。
進(jìn)水階段,調(diào)節(jié)池中超聲波液位差儀把數(shù)值傳入系統(tǒng),根據(jù)顯示的液位來控制曝氣階段風(fēng)機(jī)的變頻運(yùn)轉(zhuǎn)。
?、垤o置階段控制:曝氣運(yùn)轉(zhuǎn)5.0h,即停止曝氣,開始靜置,靜置時(shí)間控制t=1.0h。
?、軡鳚A段控制:靜置1.0h后,潷水器閥門啟動(dòng),開始潷水。直至水位達(dá)到設(shè)定水位時(shí),潷水關(guān)閉,且時(shí)間控制為1.0h,1.0h時(shí)間一到,即進(jìn)入下一周期,開始1#提升泵進(jìn)水。
(4)中間池2#泵的控制和加藥泵的控制
每天24小時(shí)不間斷運(yùn)行,只要2#泵運(yùn)行,加藥泵就運(yùn)行,2#泵一停,加藥泵即停,即加藥泵和2#提升機(jī)組是聯(lián)機(jī)操作的。
當(dāng)中間池顯示水位低于最低水位設(shè)定值時(shí),2#提升泵和加藥泵停止。
(5)MDD071C-N-030-N2S-095PA0排污系統(tǒng)控制
污泥主要是來自SBR池、混凝池及沉淀池,通過設(shè)定時(shí)間定時(shí)進(jìn)行排污。
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