烤煙煙夾烘烤過(guò)程中葉間隙風(fēng)速的研究

　　摘 要：為了解散葉烘烤過(guò)程中煙葉不同位點(diǎn)的葉間隙風(fēng)速的變化以及影響風(fēng)速變化的主要因素，利用風(fēng)速儀對(duì)中棚煙葉距離加熱室1，3，5，7 m處的8個(gè)位點(diǎn)的葉間隙風(fēng)速進(jìn)行實(shí)時(shí)監(jiān)測(cè)，同時(shí)記錄烤房的干濕球溫度，并于烘烤開(kāi)始后每隔4 h取1次樣，測(cè)定葉片與葉脈的含水率。結(jié)果表明：烘烤過(guò)程中8個(gè)位點(diǎn)葉間隙風(fēng)速差異較大，其中6號(hào)位點(diǎn)的風(fēng)速始終處于較低水平；不同烘烤階段各位點(diǎn)風(fēng)速的變化大體表現(xiàn)為先降后升的趨勢(shì)；濕球溫度在整個(gè)烘烤過(guò)程中對(duì)葉間隙風(fēng)速的影響最大，直接通徑系數(shù)為-0.974 9，葉片含水率對(duì)葉間隙風(fēng)速也有較大影響，直接通徑系數(shù)為0.404 4。在烘烤中可以通過(guò)控制煙葉含水率與濕球溫度等來(lái)調(diào)控葉間隙風(fēng)速的變化，并進(jìn)一步改善煙葉質(zhì)量。
　　關(guān)鍵詞：散葉烘烤；葉間隙風(fēng)速；烘烤階段；通徑分析
　　中圖分類號(hào)：S573 文獻(xiàn)標(biāo)識(shí)碼A DOI 編碼：10.3969/j.issn.1006-6500.2017.07.023
　　Research on Wind Speed of Leaves Gap in Tobacco-clamp Curing Process
　　ZHANG Baoquan1， CHEN Xiaoxiang1， MA Liujun1， CUI Qingwei2， ZHENG Dengfeng2， CAO Tingmao2， DAI Changming2， JIANG Minggui2， LIU Qiong2
　�。�1. China Tobacco Zhejiang Industrial Limited Company，Hangzhou， Zhejiang 310004， China； 2. Bijie Tobacco Company of Guizhou Province， Bijie， Guizhou 551700， China）
　　Abstract： In order to study the changes of wind speed of tobacco leaves gap in curing process and the main factors that affect the wind speed change， in middle layer the leaves gap wind of 8 loci， which were from the heating chamber 1， 3， 5， 7 m， were real time monitored using anemometer in lose-leaf curing process， and the wet bulb temperature and dry bulb temperature were recorded in curing process. Then the samples were taken each 4 h since beginning， and the water content of leaf blade and main veins were determined. The results showed that there was a quite difference of leaves gap wind among the 8 loci in curing process， of which the wind speed of 6 th loci was always at a low level， the change of wind speed ever loci was more complex in different curing stage， however， the tendency of most loci was ascend first and then descend. And the wet bulb temperature had the greatest influence on leaf gap wind speed in the curing process， the direct path coefficient was -0.974 9， the leaf water content also had a greater influence on leaf gap wind speed， the direct path coefficients was 0.404 4. In the curing process， the leaf gap wind speed could be controlled by controlling the moisture content of the leaves and the wet bulb temperature， and this can be used to improve the quality of tobacco leaves.
　　Key words： lose-leaf curing； wind speed of leaf gap； curing stage； path analysis
　　煙葉密集烘烤利用循環(huán)風(fēng)機(jī)使熱空氣在烤房?jī)?nèi)不斷流動(dòng)，進(jìn)而控制煙葉的變黃與失水[1-3]。烘烤過(guò)程中熱風(fēng)將煙葉內(nèi)部排出的水分帶走，風(fēng)速越大煙葉水分被帶走的效率就越高[4]。烘烤過(guò)程中葉間隙風(fēng)速的大小對(duì)煙葉外觀質(zhì)量與感官質(zhì)量以及化學(xué)成分的形成有著重要影響[5-8]。宮長(zhǎng)榮等[9]研究表明，烘烤過(guò)程中葉層間風(fēng)速在變黃階段、定色階段與干筋階段為0.22±0.05，0.35±0.12，0.40±0.17 m·s-1時(shí)烤后煙外觀質(zhì)量較好。詹軍等[7-8]研究表明，適當(dāng)降低干筋期風(fēng)機(jī)轉(zhuǎn)速能明顯改善煙葉的香氣質(zhì)量，且干筋前期降低風(fēng)機(jī)轉(zhuǎn)速對(duì)香氣物質(zhì)含量的影響相對(duì)于后期更大。馬力等[10]研究表明，裝煙密度和變黃期風(fēng)機(jī)轉(zhuǎn)速對(duì)煙葉總氮和煙堿含量的影響分別達(dá)到極顯著水平，前人的研究對(duì)于煙葉質(zhì)量的形成與經(jīng)濟(jì)價(jià)值的彰顯取得了一定的成效[11-17]�，F(xiàn)行密集烤房的循環(huán)風(fēng)機(jī)只設(shè)置2個(gè)頻率，對(duì)煙葉質(zhì)量的形成有一定的影響[18-21]。烘烤過(guò)程中葉間隙風(fēng)速的變化除受循環(huán)風(fēng)的影響外，還受到煙葉與空氣性質(zhì)的影響，然而這些因素對(duì)煙葉風(fēng)速的影響的研究鮮見(jiàn)報(bào)道。因此，對(duì)密集烘烤過(guò)程中各階段、各位點(diǎn)的風(fēng)速變化以及影響因素進(jìn)行研究，可為實(shí)現(xiàn)烤煙精準(zhǔn)烘烤提供一定的理論依據(jù)。

相關(guān)熱詞搜索：烤煙 風(fēng)速 烘烤 間隙 過(guò)程