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        風機水泵節能改造
        來源: | 作者:xldzkj | 發布時間: 2018-10-30 | 1244 次瀏覽 | 分享到:

          風機和水泵是目前工業現場中應用較多的設備,而且電機功率較大。在我國,電能最大的用戶是電機,約占總耗的50%。其中風機水泵耗電占全部電能的30%,傳統的風機水泵的風量、水流量的調節是依靠風門、閥來調節,當風量、水量的需要增加時,風門、閥門開度增加。該種調節方式簡單易行,但它是以增加管網損耗,耗費大量能源在風門、閥門上為代價的。在通常設計中,用戶配用電機的設計容量都要比實際高出很多。也就是大馬拉小車現象,造成能量的極大浪費。近年來,隨著電力、電子技術的發展,變頻技術越來越成熟,風機、泵類設備的變頻改造已得到廣大客戶的認同。

          一、風機、泵類高速的節能原理

          由流體力學可知:風量Q與轉速的一次方成正比例,壓力H與轉速的平方成正比,功率P與轉速的立方成正比。

          即: Q=K1n H=K2n2 P=K3n3

          由上面公式可知,如果風機的效率一定,當要求調節水量下降時,轉速可成正比例下降,此時風機的軸輸出功率是成立方關系下降的。

          根據水泵類的特性曲線與水阻特性曲線也可明顯看出風機水泵的節能效果。當欲使風量由Q1減少到Q2,第一種辦法即傳統辦法用擋板或閥門,此時軸輸出功率正比于面積SBH1OQ2,如果采用變頻調速,將水泵或風機轉速減低。此時軸輸出功率正比于面積SCH3OQ2,如果所需風量減少20%,則相應電機轉速降低20%,實際轉速為80%,則(0.8)3≈51%,節能達50%左右。

          二、結論

          使用交流變頻調速器對風機水泵進行改造,操作簡單、方便。節能效果非常顯著,并且能實現高度自動化。例如:空調中風機進行PID溫度控制,空氣壓縮機的恒壓供氣,智能大樓中的恒壓供水等,都可以達到較好的效果。
        風機水泵節能改造.doc

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