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低溫等離子體技術的應用
2020-03-07 14:47:24
698次訪問

臨沂雙極射頻哪家好?

等離子(zi)體(ti)處理有機廢氣的(de)(de)典型工(gong)(gong)藝有脈沖電(dian)暈放(fang)電(dian)(PCR)治理技術、填充床式反應器(FPR)治理工(gong)(gong)藝、沿面放(fang)電(dian)和介質阻擋放(fang)電(dian)(DBD)治理工(gong)(gong)藝。工(gong)(gong)藝技術核心(xin)是(shi)利(li)用放(fang)電(dian)區域內產(chan)生的(de)(de)高(gao)能(neng)密(mi)度流光等離子(zi)體(ti)處理VOCs氣體(ti)。

早期Van Veldhuizen、Penetrant等(deng)研究認為(wei)這(zhe)四(si)種工(gong)藝(yi)在(zai)相(xiang)同(tong)(tong)實(shi)驗(yan)條(tiao)件下處(chu)(chu)理(li)(li)廢(fei)(fei)氣(qi)(qi)(qi)時具有(you)(you)幾(ji)乎(hu)相(xiang)同(tong)(tong)的(de)(de)(de)(de)效果。但近(jin)年來(lai)的(de)(de)(de)(de)研究發(fa)現,對(dui)(dui)于不(bu)(bu)同(tong)(tong)的(de)(de)(de)(de)VOCs氣(qi)(qi)(qi)體,這(zhe)幾(ji)種放(fang)電(dian)(dian)方(fang)式的(de)(de)(de)(de)凈(jing)化效率各有(you)(you)不(bu)(bu)同(tong)(tong)。Kim與(yu) Futamura研究認為(wei):在(zai)干燥條(tiao)件下處(chu)(chu)理(li)(li)苯時,填充床式反(fan)(fan)應(ying)(ying)(ying)(ying)器(qi)(qi)(FPR)的(de)(de)(de)(de)治(zhi)理(li)(li)效率高(gao),但當有(you)(you)水(shui)蒸氣(qi)(qi)(qi)存在(zai)時,脈(mo)沖(chong)電(dian)(dian)暈(yun)放(fang)電(dian)(dian)技(ji)術(shu)治(zhi)理(li)(li)效率高(gao)。不(bu)(bu)同(tong)(tong)的(de)(de)(de)(de)廢(fei)(fei)氣(qi)(qi)(qi)處(chu)(chu)理(li)(li)技(ji)術(shu)都(dou)具備各自的(de)(de)(de)(de)技(ji)術(shu)特(te)點。介質阻擋放(fang)電(dian)(dian)技(ji)術(shu)的(de)(de)(de)(de)優勢(shi)是可(ke)以增加(jia)介質與(yu)氣(qi)(qi)(qi)體間(jian)的(de)(de)(de)(de)接觸面積,增加(jia)自由基的(de)(de)(de)(de)生成效率,但缺(que)點是接觸面間(jian)產生很大的(de)(de)(de)(de)場強,壓降(jiang)(jiang)(jiang)較大,不(bu)(bu)能滿(man)足大風(feng)量(liang)工(gong)業有(you)(you)機廢(fei)(fei)氣(qi)(qi)(qi)處(chu)(chu)理(li)(li)。高(gao)功率脈(mo)沖(chong)電(dian)(dian)暈(yun)工(gong)藝(yi)可(ke)在(zai)反(fan)(fan)應(ying)(ying)(ying)(ying)器(qi)(qi)內建立起較大的(de)(de)(de)(de)等(deng)離(li)子區域(yu),在(zai)保證反(fan)(fan)應(ying)(ying)(ying)(ying)器(qi)(qi)內流(liu)光橫(heng)貫(guan)高(gao)低壓極的(de)(de)(de)(de)情況下,單個反(fan)(fan)應(ying)(ying)(ying)(ying)器(qi)(qi)的(de)(de)(de)(de)直徑通常可(ke)達30~35cm,可(ke)有(you)(you)效降(jiang)(jiang)(jiang)低反(fan)(fan)應(ying)(ying)(ying)(ying)器(qi)(qi)的(de)(de)(de)(de)壓降(jiang)(jiang)(jiang);并(bing)聯(lian)多個反(fan)(fan)應(ying)(ying)(ying)(ying)器(qi)(qi)可(ke)提(ti)高(gao)處(chu)(chu)理(li)(li)風(feng)量(liang),從而提(ti)高(gao)對(dui)(dui)大風(feng)量(liang)工(gong)業廢(fei)(fei)氣(qi)(qi)(qi)處(chu)(chu)理(li)(li)的(de)(de)(de)(de)適應(ying)(ying)(ying)(ying)性。但是由于反(fan)(fan)應(ying)(ying)(ying)(ying)器(qi)(qi)尺(chi)寸過大,對(dui)(dui)于有(you)(you)機廢(fei)(fei)氣(qi)(qi)(qi)的(de)(de)(de)(de)治(zhi)理(li)(li)效率不(bu)(bu)高(gao)。近(jin)年來(lai),利用等(deng)離(li)子體技(ji)術(shu)與(yu)其他工(gong)藝(yi)技(ji)術(shu)聯(lian)合治(zhi)理(li)(li)VOCs成為(wei)該技(ji)術(shu)應(ying)(ying)(ying)(ying)用的(de)(de)(de)(de)新趨勢(shi)。 相(xiang)關的(de)(de)(de)(de)工(gong)藝(yi)技(ji)術(shu)應(ying)(ying)(ying)(ying)用簡(jian)介如下。


1.介質阻擋工藝

Anderson等采(cai)用介質阻擋(dang)反(fan)應(ying)器降解Ar/O背(bei)景(jing)(jing)氣(qi)下(xia)(xia)的(de)(de)苯(ben)(ben)(ben)(ben)乙烯(xi)(xi)(xi),結果表明(ming)較(jiao)高的(de)(de)反(fan)應(ying)器溫度有利于苯(ben)(ben)(ben)(ben)乙烯(xi)(xi)(xi)的(de)(de)氧化反(fan)應(ying)。 Tanthapanichakoon等研究(jiu)(jiu)的(de)(de)直流電(dian)(dian)暈(yun)反(fan)應(ying)器處(chu)理(li)苯(ben)(ben)(ben)(ben)乙烯(xi)(xi)(xi)的(de)(de)情況表明(ming)在N背(bei)景(jing)(jing)下(xia)(xia)高濕(shi)度對(dui)處(chu)理(li)效率有促進作(zuo)用,而在空氣(qi)背(bei)景(jing)(jing)下(xia)(xia)則是(shi)抑制作(zuo)用。章旭明(ming)比(bi)較(jiao)了(le)苯(ben)(ben)(ben)(ben)乙烯(xi)(xi)(xi)在正(zheng)、負直流電(dian)(dian)暈(yun)下(xia)(xia)的(de)(de)凈化過(guo)程(cheng),實(shi)驗(yan)結果說明(ming)正(zheng)電(dian)(dian)壓供(gong)(gong)電(dian)(dian)比(bi)負電(dian)(dian)壓供(gong)(gong)電(dian)(dian)的(de)(de)氧自由基產額(e)要大很多(duo)(duo)(duo),在任(ren)何(he)濕(shi)度下(xia)(xia)正(zheng)電(dian)(dian)暈(yun)的(de)(de)能耗(hao)都要低得多(duo)(duo)(duo),證明(ming)采(cai)用正(zheng)電(dian)(dian)暈(yun)流光等離子體具有較(jiao)好的(de)(de)處(chu)理(li)效率。上(shang)述研究(jiu)(jiu)大多(duo)(duo)(duo)選用各自的(de)(de)反(fan)應(ying)器或電(dian)(dian)源在不同(tong)(tong)的(de)(de)環境背(bei)景(jing)(jing)中對(dui)苯(ben)(ben)(ben)(ben)乙烯(xi)(xi)(xi)的(de)(de)降解能耗(hao)做(zuo)實(shi)驗(yan)。由于實(shi)驗(yan)條(tiao)件的(de)(de)不同(tong)(tong),很難對(dui)不同(tong)(tong)反(fan)應(ying)器或電(dian)(dian)源之(zhi)間的(de)(de)處(chu)理(li)效果作(zuo)出一致的(de)(de)結論。

2.交(jiao)直(zhi)流疊加電源(yuan)系統凈化工藝

目前,應(ying)用于(yu)(yu)(yu)(yu)凈(jing)化(hua)(hua)(hua)室(shi)內空氣(qi)(qi)的(de)(de)等(deng)離子(zi)體(ti)廢氣(qi)(qi)的(de)(de)交直流疊(die)加電(dian)源(yuan)(yuan)系(xi)統(tong)(AC/DC)處理裝(zhuang)置,僅(jin)限于(yu)(yu)(yu)(yu)處理氣(qi)(qi)量小于(yu)(yu)(yu)(yu)1000m/h的(de)(de)工業VOCs氣(qi)(qi)體(ti)。唐海(hai)玨等(deng)人在(zai)國內首(shou)先研(yan)制了低溫等(deng)離子(zi)體(ti)室(shi)內空氣(qi)(qi)凈(jing)化(hua)(hua)(hua)機,并應(ying)用在(zai)醫(yi)院病房、醫(yi)療(liao)儲藏室(shi)、辦公樓、賓館等(deng)場所(suo)。Mizuno等(deng)也開發了等(deng)離子(zi)體(ti)(氣(qi)(qi)速為2.5m/s)結(jie)合TiO光催化(hua)(hua)(hua)劑(ji)的(de)(de)室(shi)內污染(ran)控制技(ji)術,使細顆粒物(wu)(wu)(wu)的(de)(de)收集(ji)(ji)效率達到(dao)70%,甲醛去除率大于(yu)(yu)(yu)(yu)30%,臭(chou)氧的(de)(de)排放量小于(yu)(yu)(yu)(yu)0.1μL/L,系(xi)統(tong)壓降(jiang)僅(jin)為1mmHO(lmmHO=9.80665Fa)。目前,在(zai)工業化(hua)(hua)(hua)廢氣(qi)(qi)治理過程中使用交直流疊(die)加電(dian)源(yuan)(yuan)系(xi)統(tong)凈(jing)化(hua)(hua)(hua)工藝還需克服兩大技(ji)術困難:①研(yan)究(jiu)開發更大規模的(de)(de)易于(yu)(yu)(yu)(yu)發生流光放電(dian)的(de)(de)電(dian)源(yuan)(yuan),并降(jiang)低一次(ci)投(tou)入(ru)成本;②二次(ci)污染(ran)問題(ti),其中包括高效收集(ji)(ji)在(zai)降(jiang)解過程中產生的(de)(de)氣(qi)(qi)相副產物(wu)(wu)(wu)(有(you)機中間(jian)產物(wu)(wu)(wu)、O)及固(gu)相副產物(wu)(wu)(wu)(氣(qi)(qi)溶(rong)膠)。因此,該技(ji)術還有(you)待于(yu)(yu)(yu)(yu)進一步放大試驗(yan)。


3.等離子體-催化劑協同(tong)工藝

在(zai)(zai)實際應(ying)(ying)用(yong)(yong)(yong)(yong)中,采用(yong)(yong)(yong)(yong)單一(yi)的(de)(de)等離(li)(li)子體(ti)(ti)(ti)技(ji)術凈(jing)(jing)化(hua)(hua)(hua)(hua)(hua)(hua)VOCs氣體(ti)(ti)(ti)存(cun)(cun)在(zai)(zai)能(neng)(neng)耗(hao)高(gao)和副(fu)(fu)產(chan)物(wu)難以控制的(de)(de)問(wen)題(ti),而單獨(du)(du)采用(yong)(yong)(yong)(yong)催(cui)(cui)化(hua)(hua)(hua)(hua)(hua)(hua)氧化(hua)(hua)(hua)(hua)(hua)(hua)/還原技(ji)術又存(cun)(cun)在(zai)(zai)催(cui)(cui)化(hua)(hua)(hua)(hua)(hua)(hua)劑(ji)(ji)處理(li)(li)(li)能(neng)(neng)力、催(cui)(cui)化(hua)(hua)(hua)(hua)(hua)(hua)劑(ji)(ji)使用(yong)(yong)(yong)(yong)濃度等條件的(de)(de)限制。將二者相結合,既(ji)可(ke)降低(di)(di)處理(li)(li)(li)成本(ben),又可(ke)以延長(chang)催(cui)(cui)化(hua)(hua)(hua)(hua)(hua)(hua)劑(ji)(ji)的(de)(de)使用(yong)(yong)(yong)(yong)壽命和提高(gao)凈(jing)(jing)化(hua)(hua)(hua)(hua)(hua)(hua)能(neng)(neng)力。相關的(de)(de)研(yan)(yan)究(jiu)(jiu)已發現(xian)等離(li)(li)子體(ti)(ti)(ti)催(cui)(cui)化(hua)(hua)(hua)(hua)(hua)(hua)技(ji)術可(ke)產(chan)生協同(tong)效果(guo),能(neng)(neng)耗(hao)僅是(shi)單獨(du)(du)使用(yong)(yong)(yong)(yong)催(cui)(cui)化(hua)(hua)(hua)(hua)(hua)(hua)劑(ji)(ji)能(neng)(neng)耗(hao)的(de)(de)五分之一(yi)。有(you)(you)研(yan)(yan)究(jiu)(jiu)利用(yong)(yong)(yong)(yong)等離(li)(li)子體(ti)(ti)(ti)協同(tong)Ag/TiO催(cui)(cui)化(hua)(hua)(hua)(hua)(hua)(hua)劑(ji)(ji)填充反(fan)應(ying)(ying)器(qi),研(yan)(yan)究(jiu)(jiu)其(qi)對苯(ben)及苯(ben)的(de)(de)衍(yan)(yan)生物(wu)凈(jing)(jing)化(hua)(hua)(hua)(hua)(hua)(hua)效果(guo)。發現(xian)其(qi)凈(jing)(jing)化(hua)(hua)(hua)(hua)(hua)(hua)效率(lv)明顯提高(gao),且(qie)有(you)(you)機副(fu)(fu)產(chan)物(wu)的(de)(de)生成量明顯降低(di)(di)。在(zai)(zai)對苯(ben)的(de)(de)衍(yan)(yan)生物(wu)處理(li)(li)(li)過程中,發現(xian)凈(jing)(jing)化(hua)(hua)(hua)(hua)(hua)(hua)效率(lv)不再(zai)受氣體(ti)(ti)(ti)停留時間的(de)(de)影響,僅與(yu)等離(li)(li)子體(ti)(ti)(ti)的(de)(de)能(neng)(neng)量密度有(you)(you)關;催(cui)(cui)化(hua)(hua)(hua)(hua)(hua)(hua)反(fan)應(ying)(ying)器(qi)中氣體(ti)(ti)(ti)動(dong)(dong)力學規律從均(jun)相反(fan)應(ying)(ying)一(yi)級動(dong)(dong)力學關系向非均(jun)相反(fan)應(ying)(ying)的(de)(de)零級動(dong)(dong)力學關系轉變,另有(you)(you)研(yan)(yan)究(jiu)(jiu)發現(xian),在(zai)(zai)單獨(du)(du)使用(yong)(yong)(yong)(yong)AlO催(cui)(cui)化(hua)(hua)(hua)(hua)(hua)(hua)劑(ji)(ji)時,苯(ben)和甲苯(ben)的(de)(de)凈(jing)(jing)化(hua)(hua)(hua)(hua)(hua)(hua)效率(lv)分別(bie)為5%和24%,而采用(yong)(yong)(yong)(yong)等離(li)(li)子體(ti)(ti)(ti)協同(tong)AlO催(cui)(cui)化(hua)(hua)(hua)(hua)(hua)(hua)劑(ji)(ji)時的(de)(de)凈(jing)(jing)化(hua)(hua)(hua)(hua)(hua)(hua)效率(lv)可(ke)分別(bie)提高(gao)到52%和65%,說(shuo)明等離(li)(li)子體(ti)(ti)(ti)-催(cui)(cui)化(hua)(hua)(hua)(hua)(hua)(hua)技(ji)術可(ke)以有(you)(you)效凈(jing)(jing)化(hua)(hua)(hua)(hua)(hua)(hua)VOCs氣體(ti)(ti)(ti)。

等離子(zi)體催化技術采用(yong)的反應(ying)器可以分為一段式和(he)兩(liang)段式兩(liang)種(zhong),兩(liang)種(zhong)反應(ying)器的結構與凈化機(ji)制(zhi)各不相同(tong)。

在(zai)一(yi)段(duan)(duan)式(shi)(shi)等(deng)離(li)子(zi)體催(cui)(cui)化(hua)反(fan)(fan)應器(qi)中(zhong)(zhong),產生(sheng)(sheng)等(deng)離(li)子(zi)體的電(dian)極(ji)位于外側,催(cui)(cui)化(hua)劑(ji)置(zhi)于兩(liang)個電(dian)極(ji)之間(jian)。當電(dian)極(ji)放(fang)(fang)電(dian)時,等(deng)離(li)子(zi)體在(zai)催(cui)(cui)化(hua)劑(ji)表面(mian)及(ji)內部孔隙結構(gou)中(zhong)(zhong)生(sheng)(sheng)成(cheng)。通過改變電(dian)極(ji)的放(fang)(fang)電(dian)形式(shi)(shi)可以(yi)(yi)控(kong)制催(cui)(cui)化(hua)劑(ji)中(zhong)(zhong)等(deng)離(li)子(zi)體的生(sheng)(sheng)成(cheng)位置(zhi)與傳(chuan)播方式(shi)(shi)。而催(cui)(cui)化(hua)劑(ji)表面(mian)的物(wu)理(li)(li)化(hua)學(xue)(xue)性質,如比表面(mian)積(ji)、表面(mian)金屬含量等(deng)因(yin)(yin)素又可以(yi)(yi)影響(xiang)等(deng)離(li)子(zi)體放(fang)(fang)電(dian)的區域(yu)大小和(he)強度。因(yin)(yin)此,在(zai)利用(yong)一(yi)段(duan)(duan)式(shi)(shi)等(deng)離(li)子(zi)體催(cui)(cui)化(hua)反(fan)(fan)應器(qi)凈化(hua)VOCs氣體時,選擇(ze)具備特(te)定物(wu)理(li)(li)化(hua)學(xue)(xue)性質的催(cui)(cui)化(hua)劑(ji),同(tong)時控(kong)制電(dian)極(ji)的放(fang)(fang)電(dian)方式(shi)(shi)及(ji)強度對于提升(sheng)VOCs氣體的凈化(hua)效率至關重(zhong)要。一(yi)段(duan)(duan)式(shi)(shi)反(fan)(fan)應器(qi)協(xie)同(tong)作用(yong)明顯,有較高(gao)的凈化(hua)效率,是一(yi)種較為理(li)(li)想的工業(ye)廢氣治理(li)(li)技術,但一(yi)段(duan)(duan)式(shi)(shi)反(fan)(fan)應器(qi)催(cui)(cui)化(hua)劑(ji)失活(huo)問(wen)題(ti)較為突出(chu),壽命較短(duan)。

相較(jiao)一段(duan)式(shi)(shi)等離(li)子(zi)體(ti)催(cui)(cui)化(hua)(hua)反應(ying)器,兩段(duan)式(shi)(shi)等離(li)子(zi)體(ti)催(cui)(cui)化(hua)(hua)反應(ying)器一般采用(yong)(yong)先等離(li)子(zi)體(ti)后催(cui)(cui)化(hua)(hua)的(de)方式(shi)(shi),結構相對比較(jiao)簡單,VOCs氣體(ti)先通過(guo)等離(li)子(zi)體(ti)技術進(jin)行凈(jing)(jing)(jing)化(hua)(hua),殘余氣體(ti)及(ji)產生(sheng)的(de)副產物(wu)共同(tong)進(jin)入催(cui)(cui)化(hua)(hua)裝置,進(jin)行氧化(hua)(hua)還(huan)原反應(ying)。凈(jing)(jing)(jing)化(hua)(hua)機理相對比較(jiao)單一。常(chang)用(yong)(yong)的(de)催(cui)(cui)化(hua)(hua)劑(ji)有(you)重金屬(shu)、過(guo)渡金屬(shu)、γ-AlO、SiO、TiO等物(wu)質及(ji)其所組成的(de)復合催(cui)(cui)化(hua)(hua)劑(ji)。在兩段(duan)式(shi)(shi)體(ti)系(xi)中,催(cui)(cui)化(hua)(hua)劑(ji)的(de)使用(yong)(yong)壽(shou)命較(jiao)長,適(shi)用(yong)(yong)于室內空氣凈(jing)(jing)(jing)化(hua)(hua),但催(cui)(cui)化(hua)(hua)劑(ji)段(duan)的(de)溫度(du)影(ying)響較(jiao)為明(ming)顯,較(jiao)低的(de)反應(ying)溫度(du)下(xia),CO的(de)選擇性(xing)較(jiao)差,副產物(wu)較(jiao)多,溫度(du)過(guo)高會導致催(cui)(cui)化(hua)(hua)劑(ji)失(shi)活(huo)。

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4.等(deng)(deng)離(li)子體(ti)吸附吸收聯用(yong)工藝Yan等(deng)(deng)采(cai)用(yong)線筒式電(dian)暈(yun)放電(dian)凈(jing)化(hua)(hua)(hua)含硫惡臭氣(qi)體(ti),研(yan)究結果表(biao)明:在(zai)僅采(cai)用(yong)電(dian)暈(yun)放電(dian)凈(jing)化(hua)(hua)(hua)該(gai)(gai)氣(qi)體(ti)時,以HS的(de)(de)(de)凈(jing)化(hua)(hua)(hua)效(xiao)率作為(wei)標準,當(dang)HS氣(qi)體(ti)凈(jing)化(hua)(hua)(hua)到90%時,電(dian)流(liu)放電(dian)的(de)(de)(de)能量密度(du)為(wei)10.8J/L,當(dang)在(zai)該(gai)(gai)系(xi)統中(zhong)加人活(huo)(huo)性炭(tan)(tan)吸附裝置后,該(gai)(gai)能量密度(du)下降4.0J/L。活(huo)(huo)性炭(tan)(tan)可(ke)以吸附經等(deng)(deng)離(li)子體(ti)處(chu)(chu)理(li)的(de)(de)(de)殘余廢氣(qi)及產(chan)(chan)(chan)生的(de)(de)(de)副(fu)產(chan)(chan)(chan)物(wu),使氣(qi)態污染物(wu)在(zai)活(huo)(huo)性炭(tan)(tan)表(biao)面富集并(bing)引發二次化(hua)(hua)(hua)學反應,顯著提(ti)(ti)高(gao)了(le)凈(jing)化(hua)(hua)(hua)效(xiao)率,并(bing)降低了(le)副(fu)產(chan)(chan)(chan)物(wu)的(de)(de)(de)排出。黃立(li)維等(deng)(deng)在(zai)線筒式反應器壁鍍(du)上Ca(OH)涂層,對(dui)(dui)鹵代(dai)烴(jing)凈(jing)化(hua)(hua)(hua)過(guo)程中(zhong)產(chan)(chan)(chan)生的(de)(de)(de)鹵酸(suan)、NOx等(deng)(deng)副(fu)產(chan)(chan)(chan)物(wu)具(ju)有較好(hao)的(de)(de)(de)吸收作用(yong)。此外(wai),有機氣(qi)體(ti)的(de)(de)(de)氧(yang)化(hua)(hua)(hua)產(chan)(chan)(chan)物(wu)大(da)多是醛或羧酸(suan)等(deng)(deng)液相(xiang)溶解度(du)相(xiang)對(dui)(dui)較高(gao)的(de)(de)(de)物(wu)質(zhi),采(cai)用(yong)等(deng)(deng)離(li)子體(ti)與吸收劑相(xiang)結合(he)的(de)(de)(de)方法是一(yi)種可(ke)行(xing)的(de)(de)(de)凈(jing)化(hua)(hua)(hua)處(chu)(chu)理(li)工藝。有研(yan)究利(li)用(yong)等(deng)(deng)離(li)子體(ti)對(dui)(dui)甲苯進(jin)(jin)行(xing)氧(yang)化(hua)(hua)(hua),將生成的(de)(de)(de)副(fu)產(chan)(chan)(chan)物(wu)進(jin)(jin)行(xing)堿液原(yuan)位(wei)吸收,使等(deng)(deng)離(li)子過(guo)程產(chan)(chan)(chan)生的(de)(de)(de)O、HO等(deng)(deng)活(huo)(huo)性物(wu)質(zhi)進(jin)(jin)入到液相(xiang)中(zhong),增大(da)了(le)反應常(chang)數,并(bing)進(jin)(jin)一(yi)步(bu)氧(yang)化(hua)(hua)(hua)副(fu)產(chan)(chan)(chan)物(wu),提(ti)(ti)高(gao)了(le)活(huo)(huo)性物(wu)質(zhi)的(de)(de)(de)利(li)用(yong)效(xiao)率和有機氣(qi)體(ti)的(de)(de)(de)凈(jing)化(hua)(hua)(hua)效(xiao)率。


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