執(zhí)行器IC20-60Q3T芯科技,芯創(chuàng)新;74919035
SO2進(jìn)入大氣后,若大氣干燥清潔,可停留~2星期。經(jīng)高煙囪排放后,在.5km高空風(fēng)的影響下,24h之后會有5%以上超越7km之外,6h后,能擴(kuò)散到km之外??茖W(xué)家曾估計(jì)過,我國大部分省份排放的SO2,有一半以干濕沉降方式沉降在本省范圍,有2~3%沉降到周圍省份,其它則沉降到較遠(yuǎn)的省份。大城市則更為突出,它們排放的SO2,僅2%左右沉降在本市內(nèi),8%則被傳輸?shù)狡渌胤饺チ?。高煙囪排放含硫煙氣大大減輕了燃煤發(fā)電廠周邊地區(qū)的大氣SO2落地濃度,較為有效地改善了燃煤發(fā)電廠周邊地區(qū)的大氣環(huán)境質(zhì)量。
福建鴻飛達(dá)自動化科技有限公司
創(chuàng)立于:2011年03月03日
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變頻柜采用PLC控制,程序采用模塊化設(shè)計(jì),系統(tǒng)控制流程見圖1。平時系統(tǒng)運(yùn)行于主泵循環(huán)軟啟動變頻供水模式,系統(tǒng)用水量減小時,主泵頻率逐漸降低,當(dāng)頻率低于小流量頻率時,PID調(diào)節(jié)器發(fā)出低頻切換信號,延時后,系統(tǒng)自動進(jìn)入小泵變頻供水模式。當(dāng)用水量增大,小泵流量不能滿足系統(tǒng)需要時,PID調(diào)節(jié)器發(fā)出滿頻信號,延時后,系統(tǒng)自動返回主泵循環(huán)軟啟動變頻供水模式。為達(dá)到更好的節(jié)能效果,系統(tǒng)也可實(shí)現(xiàn)雙恒壓供水功能。以鄭州某單位住宅小區(qū)變頻供水系統(tǒng)為例,生活主泵配QDG3?2×3立式多級泵2臺,單臺Q=3m3/h,H=6m,N=11kW,小泵配QDL4.8-8×6立式多級泵1臺,Q=4.8m3/h,H=48m,N=1.5kW。
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