清(qing)水(shui)泵(beng)站(zhan)是(shi)淨(jing)化(hua)水(shui)場(chang)的(de)重(zhong)要(yao)組(zu)成(cheng)部(bu)分(fen)。它(ta)保(bao)證(zheng)居(ju)民(min)區(qu)生(sheng)活(huo)用(yong)水(shui)有(you)足(zu)夠(gou)的(de)水(shui)量(liang)與(yu)水(shui)壓(ya),同(tong)時(shi)它(ta)也(ye)是(shi)在(zai)水(shui)場(chang)中(zhong)耗(hao)能(neng)較(jiao)大(da)的(de)設(she)備(bei)。由(you)於(yu)水(shui)泵(beng)的(de)選(xuan)型(xing)時(shi)是(shi)按(an)最(zui)不(bu)利(li)條(tiao)件(jian)下(xia)、最大時流量及相應揚程設計的。而在實際運行中,由於季節、溫wen度du和he晝zhou夜ye的de變bian化hua,水shui泵beng多duo為wei低di負fu荷he工gong作zuo,以yi前qian靠kao泵beng出chu口kou閥fa門men開kai度du大da小xiao來lai調tiao節jie水shui量liang與yu水shui壓ya,其qi能neng量liang耗hao損sun很hen大da。為wei此ci,該gai廠chang在zai生sheng活huo水shui場chang清qing水shui泵beng上shang采cai用yong了le閉bi環huan控kong製zhi變bian頻pin調tiao速su技ji術shu,達da到dao了le節jie能neng和he穩wen定ding運yun行xing的de目mu的de。 一、水泵調速的節能原理 在zai實shi際ji生sheng活huo中zhong,用yong水shui量liang是shi時shi刻ke變bian化hua的de,為wei了le適shi應ying水shui量liang的de變bian化hua,以yi往wang多duo采cai用yong調tiao節jie泵beng出chu口kou閥fa門men定ding時shi去qu控kong製zhi泵beng出chu口kou壓ya力li在zai某mou一yi規gui定ding值zhi上shang,這zhe必bi然ran造zao成cheng生sheng活huo區qu用yong水shui時shi有you超chao壓ya或huo欠qian壓ya現xian象xiang。水shui泵beng機ji組zu應ying用yong變bian頻pin調tiao速su技ji術shu,即ji通tong過guo改gai變bian電dian動dong機ji定ding子zi電dian源yuan頻pin率lv來lai改gai變bian電dian動dong機ji轉zhuan速su,可ke以yi相xiang應ying地di改gai變bian水shui泵beng轉zhuan速su及ji工gong況kuang,使shi其qi流liu量liang與yu揚yang程cheng適shi應ying管guan網wang用yong水shui量liang的de變bian化hua,保bao持chi管guan網wang最zui不bu利li點dian壓ya力li恒heng定ding,達da到dao了le節jie能neng效xiao果guo。根gen據ju這zhe一yi原yuan理li,在zai應ying用yong中zhong選xuan擇ze供gong水shui管guan網wang最zui不bu利li點dian允yun許xu的de最zui低di壓ya力li為wei控kong製zhi參can數shu,通tong過guo壓ya力li傳chuan感gan器qi以yi獲huo得de壓ya力li信xin號hao,組zu成cheng閉bi環huan壓ya力li自zi控kong調tiao速su係xi統tong,以yi使shi水shui泵beng的de轉zhuan速su保bao持chi與yu調tiao速su裝zhuang置zhi所suo設she定ding的de控kong製zhi壓ya力li相xiang匹pi配pei,使shi調tiao速su技ji術shu和he自zi控kong技ji術shu相xiang結jie合he,達da到dao最zui佳jia的de節jie能neng效xiao果guo。此ci外wai,最zui不bu利li點dian的de控kong製zhi壓ya力li還hai保bao證zheng了le用yong戶hu水shui壓ya的de穩wen定ding,無wu論lun管guan路lu特te性xing曲qu線xian等deng因yin素su發fa生sheng什shen麼me變bian化hua,最zui不bu利li點dian的de水shui壓ya是shi恒heng定ding的de。保bao證zheng了le居ju民min用yong水shui壓ya力li的de可ke靠kao。 二、係統的組成 該廠淨化水廠設計2台生活供水泵,其電機功率為185kw,采用微能變頻器。由於生活區用水時刻變化,高峰期用水量可達到1200~1400t/h,而夜間最低峰用水量隻有400t/h左右。此變頻調速控製係統包括水泵、電機、時代變頻器(內置PID)、變送器等,調節手段采用管網最不利點定壓控製,壓力變送器將信號通過屏蔽電纜送到時代變頻器,同時控製2台(tai)電(dian)動(dong)機(ji)的(de)頻(pin)率(lv),保(bao)證(zheng)管(guan)網(wang)最(zui)不(bu)利(li)點(dian)的(de)壓(ya)力(li)恒(heng)定(ding),調(tiao)速(su)後(hou)的(de)揚(yang)程(cheng)與(yu)管(guan)路(lu)阻(zu)力(li)特(te)性(xing)曲(qu)線(xian)相(xiang)吻(wen)合(he),獲(huo)得(de)最(zui)佳(jia)的(de)節(jie)能(neng)效(xiao)果(guo)。變(bian)頻(pin)器(qi)頻(pin)率(lv)的(de)設(she)定(ding),既(ji)可(ke)手(shou)動(dong)設(she)定(ding)也(ye)可(ke)根(gen)據(ju)管(guan)網(wang)末(mo)端(duan)最(zui)不(bu)利(li)點(dian)的(de)壓(ya)力(li)形(xing)成(cheng)閉(bi)環(huan)控(kong)製(zhi)係(xi)統(tong),實(shi)時(shi)在(zai)線(xian)調(tiao)節(jie)電(dian)機(ji)的(de)頻(pin)率(lv)和(he)轉(zhuan)速(su)。 微(wei)能(neng)變(bian)頻(pin)器(qi)保(bao)護(hu)功(gong)能(neng)齊(qi)全(quan),從(cong)而(er)保(bao)證(zheng)並(bing)提(ti)高(gao)了(le)係(xi)統(tong)的(de)可(ke)靠(kao)性(xing),同(tong)時(shi)還(hai)沒(mei)有(you)故(gu)障(zhang)顯(xian)示(shi)記(ji)憶(yi)功(gong)能(neng),便(bian)於(yu)分(fen)析(xi)和(he)排(pai)除(chu)故(gu)障(zhang)。本(ben)係(xi)統(tong)主(zhu)要(yao)有(you)下(xia)列(lie)保(bao)護(hu)功(gong)能(neng):瞬間停電保護、過載保護、直流過電壓保護、過熱保護、防止失速保護等。 三、經濟效益分析 水shui泵beng采cai用yong微wei能neng變bian頻pin器qi後hou,泵beng的de出chu口kou揚yang程cheng大da幅fu度du下xia降jiang,節jie能neng效xiao果guo顯xian著zhu。水shui泵beng的de運yun行xing方fang式shi為wei白bai天tian兩liang台tai泵beng同tong時shi運yun行xing,夜ye間jian隻zhi運yun行xing一yi台tai泵beng,具ju體ti節jie能neng效xiao果guo如ru下xia表biao所suo示shi: 運行模式 所需電能 節能效果 輸出流量 (t/h) 運行時間 (h/a) 引入變頻器前(kw) 引入變頻器後(kw) 節功率 (kw) 節電量 (萬kw.h) 2 x 600 1080 2 x 168 2 x 124 2 x 44 2 x 4.75 2 x 400 4680 2 x 106 2 x 36.7 2 x 69.3 2 x 32.43 1 x 400 2880 1 x 106 1 x 36.7 1 x 69.3 1 x 19.96 兩台水泵年節電量(萬kw.h) 94.32
shiyongweinengbianpinqihou,zhuansuxiajiang,bengchukouyalijiangdi,jianshaolejixiemosun,jiangdileweixiugongzuoliang,yanchangleshebeideshiyongshouming。tigaolegonglvyinshu,ruanqidongtexingbimiandianjizhijieqidongshidadianliuduidianjixianquanhedianwangdechongji。 采(cai)用(yong)微(wei)能(neng)變(bian)頻(pin)器(qi)後(hou),電(dian)動(dong)機(ji)和(he)泵(beng)共(gong)同(tong)組(zu)合(he)為(wei)一(yi)體(ti),它(ta)既(ji)是(shi)動(dong)力(li)源(yuan),又(you)是(shi)供(gong)水(shui)調(tiao)節(jie)執(zhi)行(xing)機(ji)構(gou),改(gai)變(bian)了(le)傳(chuan)統(tong)的(de)控(kong)製(zhi)方(fang)式(shi),實(shi)現(xian)了(le)生(sheng)產(chan)過(guo)程(cheng)自(zi)動(dong)化(hua),減(jian)少(shao)了(le)工(gong)人(ren)的(de)勞(lao)動(dong)強(qiang)度(du)。閉(bi)環(huan)控(kong)製(zhi)係(xi)統(tong)適(shi)應(ying)水(shui)量(liang)變(bian)化(hua),實(shi)現(xian)在(zai)線(xian)調(tiao)整(zheng),保(bao)證(zheng)管(guan)網(wang)末(mo)端(duan)壓(ya)力(li)恒(heng)定(ding),不(bu)存(cun)在(zai)人(ren)為(wei)調(tiao)整(zheng)的(de)滯(zhi)後(hou)現(xian)象(xiang)。 總之,微能具有體積小、調速範圍大、效率高、wujitiaosudengtedian,zaigaichangshuibengshangyunxinganquankekao,shixianbihuankongzhixitong,manzushenghuoyongshuixuliang,baozhengguanwangmoduanyalihengding,juyoumingxiandejienengjianghaodejingjixiaoyi,tongshihaiyanchangleshebeishouming,jianshaoleweixiugongzuoliang,shiyizhongbijiaolixiangdetiaosuxitong。