YASKAWA ELECTRIC CIMR-V7NU43P7 由于空壓機(jī)全速運(yùn)轉(zhuǎn),且要用出口閥門調(diào)整供氣壓力,造成空壓機(jī)房噪聲大。
4.系統(tǒng)排氣壓力高,管徑的配置達(dá)不到空壓機(jī)氣體的流速要求,造成管路壓降偏高,減荷能耗大。
2.2 變頻恒壓供氣系統(tǒng)設(shè)計(jì)和工作原理
通過(guò)對(duì)三臺(tái)空壓機(jī)進(jìn)行變頻調(diào)速節(jié)能改造,能夠穩(wěn)定供氣管網(wǎng)的壓力,達(dá)到恒壓供氣的目的。既降低了供氣能耗,又降低了空壓機(jī)房的噪音,也延長(zhǎng)了設(shè)備的使用壽命。
每臺(tái)空壓機(jī)采用一臺(tái)變頻器驅(qū)動(dòng),采用一拖一帶工頻旁路設(shè)計(jì)方案。當(dāng)變頻器故障時(shí),空壓機(jī)可切換到工頻旁路運(yùn)行,以保證供氣系統(tǒng)的可靠性。
微能WIN-9G在石化行業(yè)上的應(yīng)用
恒壓供氣控制由系統(tǒng)YASKAWA ELECTRIC CIMR-V7NU43P7 完成:由儲(chǔ)氣罐壓力傳感器向DCS提供壓力信號(hào),與控制臺(tái)的壓力設(shè)定信號(hào)進(jìn)行比較后經(jīng)PID運(yùn)算,向變頻器送出頻率指令信號(hào),控制變頻器的輸出頻率,從而控制空壓機(jī)的轉(zhuǎn)速,達(dá)到恒壓供氣的目的。DCS系統(tǒng)送出的頻率指令信號(hào)為4~20mA電流信號(hào),相對(duì)于0~100%調(diào)速范圍。由于變頻器電流信號(hào)輸入端子的阻抗為250Ω,若將三臺(tái)變頻器的信號(hào)端子串聯(lián),總阻抗為750Ω,超出了DCS輸出信號(hào)的負(fù)載能力,所以采用一只500Ω標(biāo)準(zhǔn)電阻,將4~20mA電流信號(hào)轉(zhuǎn)換成2~10V電壓信號(hào),再并聯(lián)接到三臺(tái)變頻器的電壓信號(hào)輸入端子VG,讓三臺(tái)變頻器同步運(yùn)行,且任何一臺(tái)都可以隨時(shí)投入和退出運(yùn)行。潛油電泵采用變頻技術(shù)的由來(lái)
近十年來(lái),交流變頻裝置從小容量到大容量,從簡(jiǎn)單的開環(huán)系統(tǒng)到復(fù)雜的閉環(huán)系統(tǒng),人們?cè)诓粩嗟貒L試應(yīng)用并已享受它給人類社會(huì)帶來(lái)的巨大益處。它做為調(diào)速裝置應(yīng)用于很易使用又不方便調(diào)速的交流電機(jī)上,無(wú)論是從工藝要求還是電氣節(jié)能的需要,都在改變以往交流機(jī)不易調(diào)速的狀況。
微能潛油電泵的變頻調(diào)速應(yīng)用
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