6ES75225EH000AB0
6ES75225EH000AB0
6ES75225EH000AB0
6ES75225EH000AB0
6ES75225EH000AB0
在水泥粉磨工藝中，球磨機(jī)入磨物料粒度的大小，對(duì)其臺(tái)時(shí)產(chǎn)量影響較大，預(yù)破碎工藝作為提高磨機(jī)臺(tái)時(shí)產(chǎn)量、降低粉磨電耗的重要途徑，引起了許多水泥企業(yè)的重視。根據(jù)工藝要求，水泥立窯放料每次持續(xù)2～3 min，間隔2～3 min，但目前幾乎所有水泥企業(yè)中破碎機(jī)處于工頻恒速運(yùn)行狀態(tài)，24 h連續(xù)運(yùn)轉(zhuǎn)，造成電能的巨大浪費(fèi)，并影響電機(jī)和破碎機(jī)的使用壽命。另一方面，由于破碎機(jī)具有十分大的慣性，不易頻繁啟停，所以即使使用變頻器也難以解決系統(tǒng)制動(dòng)時(shí)產(chǎn)生的泵升電壓引起保護(hù)電路動(dòng)作，使系統(tǒng)無法正常工作。
針對(duì)系統(tǒng)的以上特點(diǎn)，利用SOHO-SM系列變頻器實(shí)現(xiàn)破碎機(jī)的變頻調(diào)速和軟啟動(dòng)；利用再生能量回饋單元克服破碎機(jī)制動(dòng)過程中產(chǎn)生的過高的泵升電壓；利用PLC實(shí)現(xiàn)系統(tǒng)的邏輯閉環(huán)控制，使破碎機(jī)的工作與立窯放料同步，實(shí)現(xiàn)間歇運(yùn)行。從而在改善工藝控制質(zhì)量的同時(shí)，最大限度地節(jié)約了電能，降低了生產(chǎn)成本?，F(xiàn)場(chǎng)調(diào)試和運(yùn)行結(jié)果表明，系統(tǒng)運(yùn)行可靠，節(jié)電率可達(dá)60%以上。
上述系統(tǒng)已在某水泥廠投入實(shí)際運(yùn)行。系統(tǒng)根據(jù)送料信號(hào)自動(dòng)實(shí)現(xiàn)啟制動(dòng)運(yùn)行，破碎機(jī)運(yùn)行速度連續(xù)可調(diào)。電機(jī)可以實(shí)現(xiàn)頻繁軟啟動(dòng)，基本無啟動(dòng)電流沖擊，啟動(dòng)力矩足夠。系統(tǒng)在變頻運(yùn)行條件下，若變頻器突然故障，則自動(dòng)切換至“工頻”狀態(tài)繼續(xù)運(yùn)行，同時(shí)發(fā)出聲光報(bào)警信號(hào)(內(nèi)部可選)。根據(jù)現(xiàn)場(chǎng)工況需要，將有放料信號(hào)時(shí)變頻運(yùn)行給定頻率設(shè)為43 Hz，系統(tǒng)運(yùn)行電流為27 A，運(yùn)行電壓280 V，改造后的系統(tǒng)平均每年耗電5.7萬度。根據(jù)現(xiàn)場(chǎng)記錄，系統(tǒng)在改造前工作頻率為工頻50 Hz，運(yùn)行電流為32 A，運(yùn)行電壓400 V，平均每年耗電19.42萬度。改造后的節(jié)電率為70.6%。該系統(tǒng)的突出優(yōu)點(diǎn)如下：
1、利用變頻調(diào)速技術(shù)改造了水泥熟料破碎機(jī)的拖動(dòng)系統(tǒng)，滿足了破碎機(jī)的低速、間歇運(yùn)行特點(diǎn)，保證了工藝控制質(zhì)量，節(jié)能效果明顯，并有利于延長(zhǎng)破碎機(jī)和電機(jī)的使用壽命。
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