描述
變頻調(diào)速技術(shù)是一種新型的、成熟的交流電機(jī)無級(jí)調(diào)速驅(qū)動(dòng)技術(shù),它以其獨(dú)特優(yōu)良的控制性被廣泛應(yīng)用在速度控制領(lǐng)域。特別是在供水行業(yè)中,由于生產(chǎn)安全和供水質(zhì)量的特殊需要,對(duì)恒壓供水壓力有著嚴(yán)格要求,變頻調(diào)速技術(shù)也得到了更加深入的應(yīng)用。
成都市自來水公司六廠日產(chǎn)水量60萬噸,擔(dān)負(fù)著成都市區(qū)及周邊地區(qū)70%以上的供水任務(wù)。自1996年年底六廠的三期工程投產(chǎn)后開始向郫縣供水,使得我廠的供水方式從單一的重力流供水變?yōu)橹亓α骱蛪毫α鹘Y(jié)合供水的方式。自向郫縣供水以來,由于考慮到現(xiàn)階段郫縣的用水量較少,從節(jié)約能耗的角度出發(fā),我廠使用一臺(tái)泵同時(shí)向郫縣供水和提供我廠的自用高壓水。為了滿足六廠自用水壓力,保證廠內(nèi)各個(gè)工藝環(huán)節(jié)設(shè)備(如消毒環(huán)節(jié)中的水射器)能正常工作,我廠自用水壓力須較恒定的控制在0.3Mpa以上,采用變頻調(diào)速控制是保證壓力恒定較為有效的方法。根據(jù)我們對(duì)郫縣城區(qū)供水量的了解,發(fā)現(xiàn)郫縣全天各時(shí)段用水量變化較大(見后圖5),如果不對(duì)供水量進(jìn)行調(diào)節(jié),管網(wǎng)壓力的波動(dòng)也會(huì)很大,容易出現(xiàn)管網(wǎng)失壓或爆管事故。采用變頻恒壓供水控制后,當(dāng)郫縣用水量較小時(shí),這時(shí)相應(yīng)管道和泵出口壓力均較大,變頻恒壓控制方式將會(huì)降低泵的頻率,減小泵出水量,從而降低管網(wǎng)壓力;反之亦然。這樣,小時(shí)用水量變化較大也不會(huì)造成管網(wǎng)壓力有較大的波動(dòng)。經(jīng)過長(zhǎng)期運(yùn)行實(shí)踐,證明了變頻調(diào)速手段實(shí)現(xiàn)恒壓供水不僅保證廠內(nèi)自用高壓水壓力足夠且穩(wěn)定,而且保證了郫縣供水的安全可靠性。
歐美品牌停產(chǎn)的,常用的“PLC”備品備件
我司產(chǎn)品應(yīng)用于以下領(lǐng)域:
1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》
2,《智能平鋼化爐系統(tǒng)制造》
3,《PLC可編程輸送控制系統(tǒng)》
4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》
6,《化工廠藥液恒流量計(jì)算機(jī)控制系統(tǒng)》
7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動(dòng)化控制系列
本特利,英維思,伍德沃德,??怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂,ACSO,力士樂等各大品牌的DCS系統(tǒng)配件,機(jī)器人系統(tǒng)配件,大型伺服系統(tǒng)備件。
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