【摘要】：針對附屬于給定機(jī)型顆粒成型機(jī)上的螺旋進(jìn)料器,對玉米秸稈粉料在進(jìn)料器內(nèi)的流動特性進(jìn)行了模擬分析。利用離散元分析軟件EDEM,創(chuàng)建了螺旋進(jìn)料器部件的幾何模型,并對玉米秸稈粉料顆粒接觸模型和顆粒生成方法進(jìn)行了研究,通過離散元模擬獲得了現(xiàn)有工況下螺旋進(jìn)料器工作時的粉料流動狀態(tài)。采用HERTZ-MINDLIN無滑移接觸模型,取重力加速度為9.81m·s~(-2),設(shè)置接觸參數(shù)并生成了秸稈顆粒25000個進(jìn)行仿真模擬。結(jié)果表明:在T=13.80~14.30s階段為一典型的出料波動周期。出料過程中粉料呈浪涌流動狀態(tài)的不連續(xù)脈動流;進(jìn)一步分別針對顆粒密度、粒徑大小、壁面摩擦因數(shù)、螺距、螺旋葉片內(nèi)徑參數(shù)進(jìn)行了流態(tài)和速度的影響因素分析。顆粒密度分別取40,80,120kg·m~(-3)時,出料所需時間分別為21.37,17.68,15.01s;粒徑分別取為2,1.8,1.6mm時,出料所需時間分別為17.68,18.06,19.37s;壁面靜摩擦因數(shù)分別取為0.58,0.48,0.38時,出料所需時間分別為17.68,16.03,15.84s;螺旋葉片內(nèi)徑分別取為50,60,70mm時,在整個模擬時長20s內(nèi)出料的平均流量分別為16.73,12.61,8.96g·s~(-1)。其中顆粒密度越大,粒徑越大,則出料速度越快,但對粉料流態(tài)無明顯影響;壁面摩擦因數(shù)越小、螺距越大、螺旋葉片內(nèi)徑越小,則出料口流速越快,流場分布越寬,落料范圍越大,流態(tài)越劇烈。本研究可為適用于生物質(zhì)顆粒成型機(jī)的螺旋進(jìn)料器的設(shè)計和改進(jìn)提供參考。
[Abstract]:In this paper, the flow characteristics of corn straw powder in the feed unit are simulated and analyzed for the screw feeder attached to a given type of particle forming machine. Using discrete element analysis software EDEM, the geometric model of screw feeder components was established, and the contact model of corn straw powder particles and the method of particle formation were studied. Through discrete element simulation, the powder flow state of the screw feeder working under the existing working conditions is obtained. The HERTZ-MINDLIN non-slip contact model was adopted and the gravity acceleration was 9.81m s ~ (-2). The contact parameters were set and 25000 straw particles were generated for simulation. The results show that the fluctuation period of discharge is typical at the stage of TX 13.80 ~ 14.30s. The discontinuous pulsating flow of powder in surge flow state during discharging process was further analyzed according to particle density, particle size, wall friction factor, pitch and inner diameter of spiral blade. When the particle density is 40,80120kg m ~ (-3), the discharge time is 21.37m ~ (- 3), the discharge time is 17.6818kg / m ~ (-3), when the particle diameter is 2 ~ 1.81.6mm, the discharge time is 17.68m ~ (-1) 18.06m ~ (-3), the wall static friction coefficient is 0.580.480.38, the discharge time is 17.68 ~ 16.0315.84s, and the inner diameter of the spiral blade is 506060mm / 70mm, respectively, when the particle density is 40 ~ (80) kg / m ~ (-3), the discharge time is 21.37 ~ (m ~ (-3) and the diameter of the spiral blade is 5060m ~ (70) mm, respectively. The average discharge rate in 20 s is 16.73% 12.61% 8.96 g s ~ (-1), respectively. The larger the particle density and the larger the particle size, the faster the discharge speed, but the less the wall friction coefficient, the larger the pitch, the smaller the diameter of the spiral blade, the faster the outlet velocity and the wider the flow field distribution. The larger the blanking range is, the more intense the flow pattern is. This study can be used as a reference for the design and improvement of screw feeder for biomass pellet molding machine.
【作者單位】： 沈陽農(nóng)業(yè)大學(xué)工程學(xué)院;重慶大學(xué)動力工程學(xué)院;
【基金】：國家自然科學(xué)基金項目(51405311)
【分類號】：TQ021.1

【相似文獻(xiàn)】

相關(guān)期刊論文 前4條

1 陶嗣巍;劉顯雙;趙東;;壓縮狀態(tài)下玉米秸稈粉粒體大變形有限元分析[J];農(nóng)業(yè)工程學(xué)報;2013年20期

2 趙東,郭康權(quán);玉米秸稈粉粒體壓制成型的力學(xué)分析[J];糧油加工與食品機(jī)械;1998年01期

3 李日強(qiáng),席玉英,曹志亮,韓文輝,劉繼青;纖維素類廢棄物的綜合利用[J];中國環(huán)境科學(xué);2002年01期

4 ;[J];;年期

相關(guān)會議論文 前1條

1 胡建軍;雷廷宙;張全國;吳創(chuàng)之;李在峰;;玉米秸稈粉碎特性試驗研究[A];2004年中國生物質(zhì)能技術(shù)與可持續(xù)發(fā)展研討會論文集[C];2004年

相關(guān)重要報紙文章 前5條

1 光合;玉米秸稈育肥肉羊方法[N];河南科技報;2000年

2 周紅檢;綠色植物飼料的制作[N];河南科技報;2008年

3 曉樂;綠色植物飼料的制作[N];博爾塔拉報;2008年

4 藝佳;發(fā)酵玉米秸代替牧草可提高奶牛產(chǎn)奶量[N];中國畜牧獸醫(yī)報;2006年

5 通訊員 蘇明邋楚亞恒;九成玉米秸稈粉身還田[N];西安日報;2008年

相關(guān)博士學(xué)位論文 前1條

1 白雪衛(wèi);玉米秸稈粉料致密成型工藝參數(shù)優(yōu)化與模擬分析[D];沈陽農(nóng)業(yè)大學(xué);2014年

，

本文編號：2202075