冷卻塔降噪噪聲污染源

風機低頻噪音治理：
消(xiao)(xiao)聲(sheng)器選(xuan)擇(ze)非常重要(yao)，一般(ban)消(xiao)(xiao)聲(sheng)器對(dui)中(zhong)低頻(pin)(pin)噪音(yin)效(xiao)果不明顯，抗(kang)(kang)(kang)性(xing)消(xiao)(xiao)聲(sheng)器治(zhi)理效(xiao)果好，但頻(pin)(pin)率選(xuan)擇(ze)性(xing)十(shi)分(fen)強，所(suo)以(yi)一般(ban)選(xuan)擇(ze)阻抗(kang)(kang)(kang)復合式消(xiao)(xiao)聲(sheng)器。 阻抗(kang)(kang)(kang)復合消(xiao)(xiao)聲(sheng)器是指(zhi)將聲(sheng)吸收和聲(sheng)反射恰(qia)當(dang)地組合起來的(de)(de)消(xiao)(xiao) 聲(sheng)器。它同(tong)時既有阻性(xing)消(xiao)(xiao)聲(sheng)器消(xiao)(xiao)除中(zhong)、高(gao)頻(pin)(pin)噪聲(sheng)和抗(kang)(kang)(kang)性(xing)消(xiao)(xiao)聲(sheng)器消(xiao)(xiao)除低、中(zhong)頻(pin)(pin)噪聲(sheng)的(de)(de)特性(xing)，具(ju)有寬頻(pin)(pin)帶的(de)(de)消(xiao)(xiao)聲(sheng)效(xiao)果。 阻抗(kang)(kang)(kang)復合式消(xiao)(xiao)聲(sheng)器型號選(xuan)擇(ze).

落水高頻噪聲治理
治理相對容易，但要(yao)注意(yi)隔音治理同時(shi)避免影(ying)(ying)響(xiang)散熱性(xing)能(neng)的(de)發(fa)揮(hui)，雖然消聲(sheng)器和消聲(sheng)百葉可以大幅(fu)降(jiang)噪(zao)(zao)，但要(yao)合理設(she)(she)計(ji)，及(ji)設(she)(she)計(ji)時(shi)要(yao)綜(zong)合考(kao)慮散熱性(xing)能(neng)和動力性(xing)能(neng)。結(jie)構不合理就達不到降(jiang)噪(zao)(zao)目 的(de)，流阻太大會(hui)影(ying)(ying)響(xiang)冷卻塔工作，降(jiang)低制(zhi)冷能(neng)力：動力性(xing)能(neng)設(she)(she)計(ji)不好也會(hui)增加阻力，甚至會(hui)產生混響(xiang)噪(zao)(zao)聲(sheng)，所以治理過程中要(yao)綜(zong)合考(kao)慮。

冷卻塔降噪標準

《中華人民共和國環境保護法》及《中華人民共和國環境噪聲污染防治條例》，保障城市居民的生活聲環境質量，我國制訂了《社會生活環境噪聲排放標準 GB22337-2008》。
1、城市區域環境噪聲標準限值見表：
2、夜間突發的噪聲，其最大值不準超過標準值15dB。
3、區域及時間的劃定：
(1)、各類標準適用區域由當地人民政府劃定。
(2)、本標準晝間、夜(ye)間的時(shi)間由當地人民政(zheng)府按當地習慣和季節變化劃(hua)定。

(時段) 邊界外聲環境功能區	晝間	夜間
0	50	40
1	55	45
2	60	50
3	65	55
4	70	55

冷卻塔降噪優勢

特菱超靜(jing)音冷(leng)卻(que)塔揉合(he)國內外先進技術(shu)配合(he)建筑物整體(ti)造(zao)型(xing)藝術(shu)而(er)獨創的新(xin)型(xing)冷(leng)卻(que)塔，同(tong)時最大限(xian)度地(di)控制了冷(leng)卻(que)塔由于(yu)保障熱交換而(er)產生不(bu)可避免向大氣排放的飄水(shui)、噪音的環(huan)境污(wu)染，它具有效率高、能耗低(di)、組合(he)靈活、便于(yu)維修等優點。

1、ABB戶外型全封閉三相異步電動機

采用了(le)ABB冷(leng)卻(que)塔(ta)專(zhuan)用電機，該(gai)電機是為冷(leng)卻(que)塔(ta)工作環(huan)境下的特殊要求而(er)專(zhuan)門設計，雙密封防水汽，方(fang)便更換、拆卸、維修(xiu)，無故障運行(xing)時間長(chang)(chang)，具(ju)有效率高(gao)，防護等級(ji)高(gao)（IP55），絕緣(yuan)等級(ji)高(gao)（F級(ji)）等特點，能在(zai)冷(leng)卻(que)塔(ta)濕熱環(huan)境條件下長(chang)(chang)期連續(xu)低能耗運行(xing)(正常(chang)使用壽命不小于20年(nian))。

2、超低轉速大風量風機

冷卻塔噪(zao)(zao)(zao)(zao)音(yin)(yin)(yin)(yin)主要(yao)(yao)由風(feng)機(ji)(ji)產(chan)(chan)生，風(feng)機(ji)(ji)噪(zao)(zao)(zao)(zao)音(yin)(yin)(yin)(yin)是(shi)由于通過風(feng)機(ji)(ji)的渦(wo)(wo)(wo)流旋(xuan)渦(wo)(wo)(wo)脈動和風(feng)機(ji)(ji)葉(xie)(xie)片(pian)(pian)及風(feng)機(ji)(ji)導流設備(bei)共(gong)同(tong)作(zuo)用而(er)產(chan)(chan)生的，主要(yao)(yao)來自渦(wo)(wo)(wo)流邊界層及尾跡。風(feng)機(ji)(ji)葉(xie)(xie)片(pian)(pian)葉(xie)(xie)尖氣流速(su)度(du)決定了風(feng)機(ji)(ji)噪(zao)(zao)(zao)(zao)音(yin)(yin)(yin)(yin)大小，風(feng)機(ji)(ji)旋(xuan)轉噪(zao)(zao)(zao)(zao)聲與(yu)葉(xie)(xie)尖速(su)度(du)的十次方成正比，渦(wo)(wo)(wo)流噪(zao)(zao)(zao)(zao)聲與(yu)葉(xie)(xie)尖速(su)度(du)的六(liu)次方成正比。因此降(jiang)低(di)(di)噪(zao)(zao)(zao)(zao)音(yin)(yin)(yin)(yin)主要(yao)(yao)降(jiang)低(di)(di)葉(xie)(xie)片(pian)(pian)葉(xie)(xie)尖的氣流速(su)度(du)。超靜音(yin)(yin)(yin)(yin)風(feng)機(ji)(ji)葉(xie)(xie)片(pian)(pian)采用航空鋁合(he)金板材，可進(jin)行無(wu)級調(diao)節角度(du)。因風(feng)機(ji)(ji)設計為(wei)寬葉(xie)(xie)葉(xie)(xie)片(pian)(pian)，低(di)(di)轉速(su)運行時具(ju)有風(feng)量大、全壓高、效率(lv)高、噪(zao)(zao)(zao)(zao)音(yin)(yin)(yin)(yin)低(di)(di)、傳動平穩等優點。而(er)且其氣動性能好(hao)、高強度(du)、耐腐蝕，并可通過改變葉(xie)(xie)片(pian)(pian)安放角度(du)方法滿足工藝要(yao)(yao)求及提高裝置(zhi)效率(lv)。

3、超靜音重力噴頭

采用重力自(zi)然池(chi)式布(bu)(bu)水(shui)(shui)，配水(shui)(shui)池(chi)水(shui)(shui)平(ping)，孔口光滑，積水(shui)(shui)深(shen)度(du)為200mm。選用口徑較大的橫流(liu)塔專門(men)布(bu)(bu)水(shui)(shui)噴頭，低水(shui)(shui)壓設計（20mmH2O），其優點是防止(zhi)堵塞、布(bu)(bu)水(shui)(shui)均(jun)勻，另外(wai)(wai)播水(shui)(shui)盆上(shang)加(jia)設盆蓋，有效地防止(zhi)雜物進入冷(leng)卻水(shui)(shui)系統(tong)造成(cheng)水(shui)(shui)污染，有效避免頻繁清洗布(bu)(bu)水(shui)(shui)盤(pan)的麻煩(fan)，同(tong)時減(jian)少布(bu)(bu)水(shui)(shui)噪音向外(wai)(wai)傳(chuan)播。

4、超靜音玻璃鋼消聲器

產品為(wei)內置空(kong)腔吸音(yin)裝置結構，外嵌微孔消音(yin)板，出(chu)風(feng)流暢、降噪(zao)能(neng)(neng)力很強(qiang)，能(neng)(neng)有(you)效地抑制低頻(pin)噪(zao)聲(sheng)對聲(sheng)環(huan)境(jing)質量造(zao)成的影響。

5、超靜音消聲百葉

外觀(guan)亮麗漂亮，產品(pin)結(jie)構(gou)為(wei)百葉內設空腔(qiang)結(jie)構(gou)，外嵌微孔消音(yin)板，內置(zhi)吸音(yin)裝(zhuang)置(zhi)。有效地降(jiang)低播淋水聲和低頻噪(zao)聲對聲環境質(zhi)量(liang)造(zao)成的影(ying)響。

6、超靜音懸浮動力系統

全(quan)懸(xuan)浮式(shi)動力系統設計，有效(xiao)地抑制和降低冷卻(que)塔運行時所產生的震動通(tong)過結構傳(chuan)遞(di)的方式(shi)對周(zhou)邊設施或建筑物造(zao)成聲質量(liang)環(huan)境的影響。

7、消聲收水填料

采用(yong)(yong)薄膜(mo)式(shi)填(tian)(tian)(tian)料，薄膜(mo)式(shi)阻燃(ran)型淋水(shui)(shui)填(tian)(tian)(tian)料散熱面(mian)積(ji)大，熱力(li)(li)性(xing)能(neng)(neng)高，集(ji)導風、散熱、收水(shui)(shui)功能(neng)(neng)于(yu)一體。該填(tian)(tian)(tian)料采用(yong)(yong)真空(kong)吸塑而(er)(er)成(cheng)，整(zheng)張懸掛(gua)式(shi)安裝，填(tian)(tian)(tian)料自動定位，無需膠水(shui)(shui)粘結，方便(bian)安裝、拆卸、清洗而(er)(er)不至于(yu)破壞填(tian)(tian)(tian)料，同時(shi)也(ye)完(wan)全(quan)(quan)解決(jue)了(le)填(tian)(tian)(tian)料因膠水(shui)(shui)粘結而(er)(er)易變脆的(de)缺(que)點，從而(er)(er)延長(chang)使用(yong)(yong)壽(shou)命（填(tian)(tian)(tian)料正常使用(yong)(yong)壽(shou)命大于(yu)15年）； 特菱超(chao)靜(jing)音(yin)冷卻塔填(tian)(tian)(tian)料PVC片(pian)材為(wei)全(quan)(quan)新(xin)料，具有(you)非常強的(de)抗(kang)寒凍(dong)性(xing)能(neng)(neng)，優越的(de)親水(shui)(shui)性(xing)，熱力(li)(li)性(xing)能(neng)(neng)和(he)抗(kang)腐(fu)蝕能(neng)(neng)力(li)(li)。填(tian)(tian)(tian)料片(pian)為(wei)難(nan)燃(ran)型材料，氧指(zhi)數高達34.2，達到(dao)國家(jia)B1級難(nan)燃(ran)標(biao)準(zhun)，優于(yu)B2級標(biao)準(zhun)，在65℃水(shui)(shui)溫(wen)中72小(xiao)時(shi)不發(fa)生變形現象，經過實踐(jian)運行(xing)證(zheng)明(ming)，該填(tian)(tian)(tian)料能(neng)(neng)長(chang)期在50℃環(huan)境(jing)中運行(xing)。

8、進口軸承減速器

減速(su)器軸承為日本NSK高精度軸承，傳動(dong)皮帶為日本"三(san)星"（MITSUBOSHI）優質防水、防滑(hua)三(san)角皮帶，槽輪與皮帶經動(dong)靜平衡測試(shi)，符合穩定運(yun)轉要求。

冷卻塔降噪方法

1．加裝排風消聲器：
在(zai)(zai)冷(leng)(leng)(leng)卻(que)塔(ta)的(de)(de)出(chu)(chu)風(feng)(feng)(feng)(feng)(feng)(feng)口加(jia)裝一套(tao)阻抗復合式排(pai)風(feng)(feng)(feng)(feng)(feng)(feng)消(xiao)(xiao)(xiao)(xiao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)器(qi)(qi)吸(xi)收排(pai)風(feng)(feng)(feng)(feng)(feng)(feng)氣流(liu)噪(zao)(zao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)。消(xiao)(xiao)(xiao)(xiao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)器(qi)(qi)設計(ji)根據軸流(liu)風(feng)(feng)(feng)(feng)(feng)(feng)機的(de)(de)風(feng)(feng)(feng)(feng)(feng)(feng)量、風(feng)(feng)(feng)(feng)(feng)(feng)壓大小與(yu)出(chu)(chu)風(feng)(feng)(feng)(feng)(feng)(feng)口的(de)(de)噪(zao)(zao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)頻(pin)率特性來考慮，并控制通過消(xiao)(xiao)(xiao)(xiao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)器(qi)(qi)內的(de)(de)流(liu)速。消(xiao)(xiao)(xiao)(xiao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)器(qi)(qi)一般(ban)由(you) 隔聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)吸(xi)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)外(wai)殼、導(dao)流(liu)消(xiao)(xiao)(xiao)(xiao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)片(pian)(pian)等組成。排(pai)風(feng)(feng)(feng)(feng)(feng)(feng)消(xiao)(xiao)(xiao)(xiao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)器(qi)(qi)與(yu)冷(leng)(leng)(leng)卻(que)塔(ta)排(pai)風(feng)(feng)(feng)(feng)(feng)(feng)口采(cai)用(yong)(yong)(yong)(yong)導(dao)風(feng)(feng)(feng)(feng)(feng)(feng)筒連(lian)接。排(pai)風(feng)(feng)(feng)(feng)(feng)(feng)消(xiao)(xiao)(xiao)(xiao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)器(qi)(qi)外(wai)殼用(yong)(yong)(yong)(yong)50厚(hou)彩鋼夾芯板(ban)(ban)拼裝，消(xiao)(xiao)(xiao)(xiao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)插片(pian)(pian)用(yong)(yong)(yong)(yong)80mm厚(hou)防(fang)潮離心玻璃棉作(zuo)為吸(xi)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)層，用(yong)(yong)(yong)(yong)憎水玻纖布包覆， 有效的(de)(de)降低出(chu)(chu)風(feng)(feng)(feng)(feng)(feng)(feng)口的(de)(de)噪(zao)(zao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)，同時(shi)也不(bu)影響(xiang)冷(leng)(leng)(leng)卻(que)塔(ta)風(feng)(feng)(feng)(feng)(feng)(feng)機的(de)(de)正常運行(xing)。消(xiao)(xiao)(xiao)(xiao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)片(pian)(pian)飾面(mian)層為0.8mm厚(hou)鋁合金穿(chuan)(chuan)孔(kong)板(ban)(ban)，穿(chuan)(chuan)孔(kong)率大于30%，輕鋼龍骨(gu)結(jie)構(gou)。消(xiao)(xiao)(xiao)(xiao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)插片(pian)(pian)為活絡結(jie)構(gou)，可以從消(xiao)(xiao)(xiao)(xiao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)器(qi)(qi)中抽出(chu)(chu)，以便檢 修冷(leng)(leng)(leng)卻(que)塔(ta)風(feng)(feng)(feng)(feng)(feng)(feng)機和電機。在(zai)(zai)消(xiao)(xiao)(xiao)(xiao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)器(qi)(qi)過渡管區開設維(wei)修孔(kong)門, 維(wei)修人員從兩側扶梯上到冷(leng)(leng)(leng)卻(que)塔(ta)上面(mian)進行(xing)維(wei)修。排(pai)風(feng)(feng)(feng)(feng)(feng)(feng)消(xiao)(xiao)(xiao)(xiao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)器(qi)(qi)的(de)(de)尺寸為長4.6米(mi)(mi)*寬2.5米(mi)(mi)*高1.0米(mi)(mi)，排(pai)風(feng)(feng)(feng)(feng)(feng)(feng)導(dao)風(feng)(feng)(feng)(feng)(feng)(feng)筒的(de)(de)尺寸為長4.6米(mi)(mi)*寬2.5米(mi)(mi) *高1.6米(mi)(mi)。排(pai)風(feng)(feng)(feng)(feng)(feng)(feng)消(xiao)(xiao)(xiao)(xiao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)器(qi)(qi)型鋼安裝支架與(yu)原有冷(leng)(leng)(leng)卻(que)塔(ta)脫開，自(zi)成體系(xi)，避(bi)免(mian)產生共振現象。因冷(leng)(leng)(leng)卻(que)塔(ta)出(chu)(chu)風(feng)(feng)(feng)(feng)(feng)(feng)口處工況較復雜，特別是水霧(wu)嚴重，消(xiao)(xiao)(xiao)(xiao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)插片(pian)(pian)飾面(mian)層如采(cai)用(yong)(yong)(yong)(yong)鍍鋅穿(chuan)(chuan)孔(kong)鋼板(ban)(ban)，長期在(zai)(zai)潮濕環 境下工作(zuo)，容(rong)易(yi)銹(xiu)蝕。為避(bi)免(mian)出(chu)(chu)現此類(lei)問題(ti)，延(yan)長消(xiao)(xiao)(xiao)(xiao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)器(qi)(qi)使(shi)用(yong)(yong)(yong)(yong)年限，故消(xiao)(xiao)(xiao)(xiao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)片(pian)(pian)護(hu)面(mian)采(cai)用(yong)(yong)(yong)(yong)0.8mm厚(hou)穿(chuan)(chuan)孔(kong)鋁合金板(ban)(ban)。選(xuan)用(yong)(yong)(yong)(yong)消(xiao)(xiao)(xiao)(xiao)低頻(pin)型消(xiao)(xiao)(xiao)(xiao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)器(qi)(qi)，消(xiao)(xiao)(xiao)(xiao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)器(qi)(qi)性能需滿足下表：

2. 加裝隔聲屏：
聲(sheng)(sheng)(sheng)(sheng)波(bo)在傳(chuan)播過程中遇到障(zhang)(zhang)礙時，就(jiu)會(hui)(hui)發生反射(she)、透射(she)和繞(rao)射(she)三種現象。聲(sheng)(sheng)(sheng)(sheng)屏(ping)(ping)(ping)(ping)(ping)障(zhang)(zhang)就(jiu)是在聲(sheng)(sheng)(sheng)(sheng)源與受(shou)(shou)(shou)(shou)聲(sheng)(sheng)(sheng)(sheng)點之間(jian)插入(ru)一個設施，用以(yi)隔(ge)(ge)斷聲(sheng)(sheng)(sheng)(sheng)源到達(da)受(shou)(shou)(shou)(shou)聲(sheng)(sheng)(sheng)(sheng)點的(de)(de)(de)(de)(de)直(zhi)達(da)聲(sheng)(sheng)(sheng)(sheng)波(bo)，使部分聲(sheng)(sheng)(sheng)(sheng)波(bo)受(shou)(shou)(shou)(shou)阻反射(she)，部分聲(sheng)(sheng)(sheng)(sheng)波(bo)則(ze)經吸收衰減后，通過屏(ping)(ping)(ping)(ping)(ping)體透射(she)（極小）和屏(ping)(ping)(ping)(ping)(ping)頂繞(rao)射(she)等(deng)附加衰減形(xing)式(shi)到達(da)受(shou)(shou)(shou)(shou)聲(sheng)(sheng)(sheng)(sheng)點，達(da)到減輕受(shou)(shou)(shou)(shou)聲(sheng)(sheng)(sheng)(sheng)點的(de)(de)(de)(de)(de)噪(zao)(zao)聲(sheng)(sheng)(sheng)(sheng)影(ying)響、取得降(jiang)(jiang)噪(zao)(zao)效(xiao)(xiao)果(guo)的(de)(de)(de)(de)(de)目的(de)(de)(de)(de)(de)。屏(ping)(ping)(ping)(ping)(ping)障(zhang)(zhang)的(de)(de)(de)(de)(de)高(gao)(gao)(gao)度及寬度原則(ze)上以(yi)隔(ge)(ge)斷聲(sheng)(sheng)(sheng)(sheng)源到達(da)受(shou)(shou)(shou)(shou)聲(sheng)(sheng)(sheng)(sheng)點的(de)(de)(de)(de)(de)直(zhi)達(da)聲(sheng)(sheng)(sheng)(sheng)波(bo)為(wei)最(zui)低(di)限度，一般來說，為(wei)提高(gao)(gao)(gao)屏(ping)(ping)(ping)(ping)(ping)蔽效(xiao)(xiao)果(guo)，隔(ge)(ge)聲(sheng)(sheng)(sheng)(sheng)屏(ping)(ping)(ping)(ping)(ping)的(de)(de)(de)(de)(de)高(gao)(gao)(gao)度通常(chang)不(bu)低(di)于(yu)進(jin)風口(kou)(kou)(kou)高(gao)(gao)(gao)度的(de)(de)(de)(de)(de)1.3倍；為(wei)避免影(ying)響進(jin)風，屏(ping)(ping)(ping)(ping)(ping)障(zhang)(zhang)離進(jin)風口(kou)(kou)(kou)距離通常(chang)不(bu)小于(yu)進(jin)風口(kou)(kou)(kou)高(gao)(gao)(gao)度的(de)(de)(de)(de)(de)2倍。 為(wei)節(jie)省(sheng)投資，同(tong)時達(da)到降(jiang)(jiang)噪(zao)(zao)效(xiao)(xiao)果(guo)的(de)(de)(de)(de)(de)最(zui)大化，在冷卻塔四(si)周的(de)(de)(de)(de)(de)其中三面加裝依附獨立鋼(gang)(gang)架做成如(ru)圖所示形(xing)狀的(de)(de)(de)(de)(de)隔(ge)(ge)聲(sheng)(sheng)(sheng)(sheng)屏(ping)(ping)(ping)(ping)(ping)障(zhang)(zhang)控制落水噪(zao)(zao)聲(sheng)(sheng)(sheng)(sheng)及進(jin)風口(kou)(kou)(kou)泄漏噪(zao)(zao)聲(sheng)(sheng)(sheng)(sheng)，隔(ge)(ge)聲(sheng)(sheng)(sheng)(sheng)屏(ping)(ping)(ping)(ping)(ping)障(zhang)(zhang)構(gou)(gou)造為(wei)外側安(an)裝具有隔(ge)(ge)聲(sheng)(sheng)(sheng)(sheng)、防水，輕型的(de)(de)(de)(de)(de)夾芯(xin)彩鋼(gang)(gang)板，內側為(wei)穿(chuan)孔(kong)鋁合金板。穿(chuan)孔(kong)板的(de)(de)(de)(de)(de)參(can)數為(wei)：板厚(hou) 0.8mm，孔(kong)直(zhi)徑5mm，穿(chuan)孔(kong)率 30％(穿(chuan)孔(kong)率過低(di)會(hui)(hui)降(jiang)(jiang)低(di)隔(ge)(ge)聲(sheng)(sheng)(sheng)(sheng)屏(ping)(ping)(ping)(ping)(ping)的(de)(de)(de)(de)(de)降(jiang)(jiang)噪(zao)(zao)作用，一般都設計(ji)在 28％至(zhi) 35％)，后置吸聲(sheng)(sheng)(sheng)(sheng)腔(qiang)，彩鋼(gang)(gang)夾芯(xin)板厚(hou)度為(wei) 50mm，在彩鋼(gang)(gang)夾芯(xin)板內側加吸聲(sheng)(sheng)(sheng)(sheng)構(gou)(gou)件厚(hou) 50mm，內填高(gao)(gao)(gao)效(xiao)(xiao)吸聲(sheng)(sheng)(sheng)(sheng)玻璃棉。采用 H 型鋼(gang)(gang)或方管作為(wei)支(zhi)(zhi)撐結構(gou)(gou)，將(jiang)屏(ping)(ping)(ping)(ping)(ping)障(zhang)(zhang)插入(ru)支(zhi)(zhi)撐結構(gou)(gou)中。

冷卻塔降噪工程

沈陽(yang)某高(gao)檔住宅(zhai)小區(qu)采用集中供冷方式(shi)，將2臺方形逆流式(shi)冷卻塔安裝在14幢(chuang)居民(min)樓前的空地上。經測試，平均噪聲(sheng)量高(gao)達68分貝，超過了(le)環境噪聲(sheng)標準的規定。居民(min)強(qiang)烈要求治理(li)冷卻塔的噪聲(sheng)污(wu)染。

噪(zao)聲(sheng)源分析： 冷(leng)卻塔(ta)的噪(zao)聲(sheng)源主(zhu)要包括(kuo)風(feng)機的空氣動力噪(zao)聲(sheng)、機械噪(zao)聲(sheng)和(he)落水噪(zao)聲(sheng)。

冷卻塔降噪方案：
1、在風機出風口設置阻性消聲器，有效阻止噪聲傳播。
2、為保證冷卻塔的散熱，設置組合式聲屏障來阻止下部噪聲傳播。
3、為有效減少噪聲，在冷卻塔底部設置吸隔聲組合式聲屏障吸收噪聲。
4、在冷卻塔中部設置阻尼隔聲板和吸聲材料，提高吸聲效果。
5、落水噪聲用玻璃棉材料吸(xi)收。

如果噪聲源大可用隔聲屏，噪聲可分為空氣性噪聲和固體性噪聲。

空氣性噪聲，如果噪聲源小可設隔聲罩，消聲器，降噪效果明顯。總之在傳播途徑中考慮降噪。

固體性噪(zao)聲，就要對噪(zao)聲源設備實施(shi)減振。通過(guo)減振可有效降低低頻噪(zao)聲根據噪(zao)聲源的(de)不同(tong)，但降噪(zao)效果不佳