為(wei)了(le)驗證小(xiao)型(xing)U形(xing)風(feng)(feng)(feng)管(guan)(guan)(guan)(guan)的(de)科學性(xing)，們使用數值模(mo)擬(ni)和(he)計算來模(mo)擬(ni)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)的(de)通(tong)風(feng)(feng)(feng)時間(jian)(jian)(jian)的(de)氣流和(he)冷(leng)(leng)卻(que)(que)效果(guo)。在(zai)常見的(de)U形(xing)和(he)小(xiao)U形(xing)風(feng)(feng)(feng)管(guan)(guan)(guan)(guan)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)連續72小(xiao)時機械通(tong)風(feng)(feng)(feng)后，每(mei)個系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)的(de)谷物溫度(du)的(de)空間(jian)(jian)(jian)分(fen)(fen)布(bu)如下圖(tu)所示。溫度(du)場分(fen)(fen)析(xi)結果(guo)表(biao)(biao)明(ming)，糧庫(ku)密閉門廠(chang)家，普通(tong)U形(xing)管(guan)(guan)(guan)(guan)道(dao)(dao)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)的(de)溫度(du)是對(dui)(dui)稱(cheng)分(fen)(fen)布(bu)的(de)，在(zai)拐角和(he)中間(jian)(jian)(jian)區(qu)域仍有一(yi)小(xiao)部分(fen)(fen)死(si)區(qu)。為(wei)了(le)消除(chu)死(si)區(qu)，必須進一(yi)步延(yan)長機械通(tong)風(feng)(feng)(feng)時間(jian)(jian)(jian)。相對(dui)(dui)而言，小(xiao)型(xing)U形(xing)管(guan)(guan)(guan)(guan)道(dao)(dao)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)的(de)冷(leng)(leng)卻(que)(que)效果(guo)更好(hao)。由(you)于風(feng)(feng)(feng)道(dao)(dao)不(bu)對(dui)(dui)稱(cheng)，兩個分(fen)(fen)支的(de)總長度(du)相等(deng)，顆粒(li)(li)堆的(de)溫度(du)也不(bu)對(dui)(dui)稱(cheng)分(fen)(fen)布(bu)，兩個管(guan)(guan)(guan)(guan)道(dao)(dao)末(mo)端(duan)的(de)冷(leng)(leng)卻(que)(que)效果(guo)相對(dui)(dui)較(jiao)近。該結構有利于改善整體冷(leng)(leng)卻(que)(que)均勻性(xing)。基本上消滅了(le)死(si)區(qu)。根據體積平均統(tong)(tong)(tong)(tong)計，糧庫(ku)密閉門價格，在(zai)全谷粒(li)(li)堆經(jing)機械通(tong)風(feng)(feng)(feng)72小(xiao)時后，小(xiao)型(xing)U形(xing)風(feng)(feng)(feng)管(guan)(guan)(guan)(guan)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)的(de)糧堆溫度(du)為(wei)17.4℃，而谷粒(li)(li)堆的(de)溫度(du)降低。普通(tong)的(de)U形(xing)管(guan)(guan)(guan)(guan)道(dao)(dao)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)是18.1。 ℃。這(zhe)表(biao)(biao)明(ming)優(you)化的(de)小(xiao)型(xing)U形(xing)風(feng)(feng)(feng)管(guan)(guan)(guan)(guan)提高(gao)了(le)通(tong)風(feng)(feng)(feng)的(de)均勻性(xing)，冷(leng)(leng)卻(que)(que)效果(guo)更加顯(xian)著，對(dui)(dui)高(gao)大(da)倉庫(ku)具有更好(hao)的(de)適應性(xing)。

工作原(yuan)理(li)在薄(bo)膜表面上(shang)施(shi)加(jia)薄(bo)膜密封后(hou)，軸(zhou)(zhou)流(liu)風(feng)(feng)(feng)扇(shan)沿著壁(bi)面空(kong)氣(qi)通(tong)(tong)道從(cong)相(xiang)對側吸(xi)入冷空(kong)氣(qi)，氣(qi)流(liu)沿水平方向橫(heng)穿谷(gu)粒堆。實驗方法是驗證橫(heng)向通(tong)(tong)風(feng)(feng)(feng)的有效性，并(bing)且(qie)測(ce)試比較了(le)兩個系統(tong)的通(tong)(tong)風(feng)(feng)(feng)效果。控制倉(cang)庫的通(tong)(tong)風(feng)(feng)(feng)通(tong)(tong)道為(wei)地上(shang)籠(long)(long)半(ban)圓(yuan)形(xing)260mm×400mm，開(kai)口(kou)(kou)(kou)率為(wei)35％，一機三(san)組，風(feng)(feng)(feng)量比為(wei)1.35;試驗室空(kong)氣(qi)通(tong)(tong)道為(wei)半(ban)圓(yuan)形(xing)260mm×400mm通(tong)(tong)風(feng)(feng)(feng)籠(long)(long)，開(kai)口(kou)(kou)(kou)率為(wei)35％，一機三(san)組四組，邯鄲糧庫密閉門(men)，四個通(tong)(tong)風(feng)(feng)(feng)口(kou)(kou)(kou)。根據機械(xie)通(tong)(tong)風(feng)(feng)(feng)技術規范的要求(qiu)，試驗箱沿前后(hou)門(men)兩側的墻壁(bi)安裝(zhuang)。沿墻壁(bi)安裝(zhuang)一組三(san)個通(tong)(tong)風(feng)(feng)(feng)槽，以(yi)選擇(ze)適(shi)合通(tong)(tong)風(feng)(feng)(feng)的溫度和(he)濕度條(tiao)件，并(bing)打開(kai)底側的通(tong)(tong)風(feng)(feng)(feng)口(kou)(kou)(kou)。側面連接軸(zhou)(zhou)流(liu)風(feng)(feng)(feng)扇(shan)進(jin)行通(tong)(tong)風(feng)(feng)(feng);控制室未蓋好，蓋子(zi)上(shang)裝(zhuang)有混(hun)(hun)流(liu)風(feng)(feng)(feng)扇(shan)，吸(xi)風(feng)(feng)(feng)式通(tong)(tong)風(feng)(feng)(feng)，通(tong)(tong)風(feng)(feng)(feng)后(hou)蓋子(zi)和(he)薄(bo)膜密封;谷(gu)物類型(xing)：混(hun)(hun)合小麥(mai)。

目前，中(zhong)國(guo)大部分(fen)糧(liang)(liang)庫都以大型倉(cang)(cang)庫為主要(yao)倉(cang)(cang)庫。在傳統(tong)(tong)的(de)(de)(de)糧(liang)(liang)食儲(chu)存過(guo)程中(zhong)，倉(cang)(cang)庫類型主要(yao)配(pei)備垂直(zhi)機械(xie)(xie)通(tong)風(feng)(feng)和(he)溫控濕(shi)度等設(she)施，如地(di)上網箱或地(di)面槽。然而，垂直(zhi)通(tong)風(feng)(feng)系統(tong)(tong)均勻性差(cha)，存在通(tong)風(feng)(feng)死角和(he)通(tong)風(feng)(feng)效(xiao)率低的(de)(de)(de)現象，給糧(liang)(liang)食儲(chu)存安全帶來一(yi)定的(de)(de)(de)隱患(huan)。此外，與垂直(zhi)通(tong)風(feng)(feng)相匹配(pei)的(de)(de)(de)籠式設(she)施也對糧(liang)(liang)食機械(xie)(xie)化造成了一(yi)定的(de)(de)(de)障礙。降(jiang)低進出倉(cang)(cang)庫的(de)(de)(de)效(xiao)率。針對垂直(zhi)通(tong)風(feng)(feng)系統(tong)(tong)的(de)(de)(de)缺點，國(guo)家糧(liang)(liang)食管理科學技術研究所的(de)(de)(de)通(tong)過(guo)反復試(shi)驗(yan)和(he)試(shi)驗(yan)，糧(liang)(liang)庫密閉門廠，開(kai)發了一(yi)種水(shui)平(ping)通(tong)風(feng)(feng)系統(tong)(tong)。據說水(shui)平(ping)通(tong)風(feng)(feng)系統(tong)(tong)效(xiao)果明(ming)顯(xian)，不會(hui)妨礙糧(liang)(liang)食進入倉(cang)(cang)庫的(de)(de)(de)機械(xie)(xie)化。下面，科技Jun分(fen)析(xi)了江(jiang)蘇儀征國(guo)家倉(cang)(cang)儲(chu)的(de)(de)(de)實驗(yan)數(shu)據，分(fen)析(xi)了水(shui)平(ping)通(tong)風(feng)(feng)系統(tong)(tong)的(de)(de)(de)亮點和(he)優勢(shi)。