本文主要研究内容
作者孟国栋（2019）在《稻谷热风—真空联合干燥特性及工艺优化研究》一文中研究指出：中国南方高温阴雨季节收获的稻谷含水率高,极易发生霉变、腐烂现象造成巨大经济损失,及时对其进行干燥储藏、保证干后品质是稻谷收获后的重要工作。热风和真空干燥是两种常用干燥方式,但单一的稻谷热风或真空干燥作业方式自身都存在不可避免的局限性,稻谷热风-真空联合干燥可以将两种干燥方式的优点集合起来,更好地满足稻谷的干燥生产作业。本文在稻谷热风、真空以及热风-真空联合干燥方式下对稻谷的干燥特性、干燥模型、工艺优化以及能效评价方面进行了深入研究,主要工作包括:（1）通过稻谷热风、真空单因素干燥试验,分析各因素对干燥特性曲线的影响程度;利用Weibulll函数拟合含水率比MR曲线并求解尺度参数α及形状参数β,建立含水率比Weibulll函数预测模型并验证其可靠性,计算水分扩散系数Deff、Dcal以及几何参数Rg值。结果显示:热风温度和真空温度对干燥速率DR和总干燥时间的影响较大,热风风速和真空度对干燥速率DR和总干燥时间的影响较小。各干燥方式下的Weibulll函数拟合决定系数R2值均在0.96以上,拟合均方根误差RMSE及离差平方和χ2值均小于0.1,说明Weibulll函数对含水率比曲线的拟合效果较好。对稻谷热风、真空Weibulll函数预测模型进行试验验证,发现模型预测值与实验值的相对误差均低于10%,说明稻谷热风及真空干燥Weibulll函数预测模型的预测准确度较高。（2）通过热风、真空二次回归通用旋转试验,建立不同干燥方式单指标数学模型并进行显著性检验、方差及响应面分析,研究各因素对单指标的显著性影响程度。通过归一化处理和加权评分得到不同权重比下的7组综合指标值并进行工艺参数优化。结果显示:热风温度对平均干燥速率r和爆腰率b的影响非常显著,对单位能耗e影响一般显著;风速对平均干燥速率r和单位能耗e影响非常显著,对爆腰率b影响不显著。真空温度对所有指标影响均非常显著;真空度对干燥速率r和单位能耗e影响非常显著,对爆腰率b影响一般显著。所有单目标模型的决定系数R2、校正系数Adj R2、预测决定系数Pred R2都超过0.9以上,变异系数C.V.%值都低于10%,说明模型拟合效果好,可信度高。热风干燥的最优参数组合为:温度35℃、风速0.6m/s,此时的平均干燥速率r为0.000685g/（g?min）,爆腰率b为7%,单位能耗e为6552kJ/kg。真空干燥最优参数组合为:温度44℃、真空度0.05Mpa。此时的平均干燥速率r为0.000363g/（g?min）,爆腰率b为7.3%,单位能耗e为2988kJ/kg。（3）在单一干燥方式研究基础上,通过热风-真空联合干燥四元二次BBD（Box-Behnken Design）试验,建立联合干燥方式下的单指标数学模型并进行显著性检验、方差及响应面分析,研究稻谷热风-真空联合干燥方式下各因素对评价指标的影响程度。通过归一化处理和加权评分得到不同权重比下的11组综合指标值并进行工艺参数优化,并对比分析联合干燥较单一干燥方式的优势特点。结果显示:热风温度T0对平均干燥速率r和爆腰率b的影响非常显著,对单位能耗e影响不显著。热风风速v对平均干燥速率r影响不显著,对爆腰率b和单位能耗e影响非常显著。转换点含水率M和真空温度T1对三个单指标影响都非常显著。所有单指标模型的决定系数R2、校正系数Adj R2和预测决定系数Pred R2都超过0.9以上,变异系数C.V.%值都低于10%,说明模型拟合效果好,可信度高。最优工艺参数组合为Y（3:6:1）:T0=40℃v=0.7m/s M=20.7%T1=38.1℃（V=0.05Mpa）,对应的平均干燥速率r为0.000483g/（g?min）,爆腰率b为6.3%,单位能耗e为2612kJ/kg。将联合干燥最优参数组合对应的单目标值与单一干燥方式最优参数组合对应的单目标值进行比较分析发现稻谷联合干燥方式较单一干燥方式优势明显。（4）通过热风干燥两因素三水平全面试验,对热风干燥?传递进行深入解析,考察温度和风速对热?及流动?效率的影响规律。通过稻谷热风干燥能量利用效率和干燥系统能耗结构的分析,对热风干燥系统进行能效评价。结果显示:随着温度的升高平均热?效率降低而平均流动?效率升高,随着风速的升高平均热?效率和平均流动?效率均降低。风速0.5m/s条件下不同温度对应的平均热?和平均流动?效率值最高,40、50、60℃对应的平均热?和平均流动?效率分别为:0.683、0.679、0.602,0.275、0.397、0.466。综合比较平均热?效率和平均流动?效率可知,50℃、0.5m/s条件下的综合?效率最高。而由能量利用效率和干燥系统能耗结构分析可知能效最优条件为50℃、0.5m/s,该条件下的稻谷干燥能耗为0.27kW?h,与?效率分析结果相一致。
Abstract
zhong guo na fang gao wen yin yu ji jie shou huo de dao gu han shui lv gao ,ji yi fa sheng mei bian 、fu lan xian xiang zao cheng ju da jing ji sun shi ,ji shi dui ji jin hang gan zao chu cang 、bao zheng gan hou pin zhi shi dao gu shou huo hou de chong yao gong zuo 。re feng he zhen kong gan zao shi liang chong chang yong gan zao fang shi ,dan chan yi de dao gu re feng huo zhen kong gan zao zuo ye fang shi zi shen dou cun zai bu ke bi mian de ju xian xing ,dao gu re feng -zhen kong lian ge gan zao ke yi jiang liang chong gan zao fang shi de you dian ji ge qi lai ,geng hao de man zu dao gu de gan zao sheng chan zuo ye 。ben wen zai dao gu re feng 、zhen kong yi ji re feng -zhen kong lian ge gan zao fang shi xia dui dao gu de gan zao te xing 、gan zao mo xing 、gong yi you hua yi ji neng xiao ping jia fang mian jin hang le shen ru yan jiu ,zhu yao gong zuo bao gua :（1）tong guo dao gu re feng 、zhen kong chan yin su gan zao shi yan ,fen xi ge yin su dui gan zao te xing qu xian de ying xiang cheng du ;li yong Weibulllhan shu ni ge han shui lv bi MRqu xian bing qiu jie che du can shu αji xing zhuang can shu β,jian li han shui lv bi Weibulllhan shu yu ce mo xing bing yan zheng ji ke kao xing ,ji suan shui fen kuo san ji shu Deff、Dcalyi ji ji he can shu Rgzhi 。jie guo xian shi :re feng wen du he zhen kong wen du dui gan zao su lv DRhe zong gan zao shi jian de ying xiang jiao da ,re feng feng su he zhen kong du dui gan zao su lv DRhe zong gan zao shi jian de ying xiang jiao xiao 。ge gan zao fang shi xia de Weibulllhan shu ni ge jue ding ji shu R2zhi jun zai 0.96yi shang ,ni ge jun fang gen wu cha RMSEji li cha ping fang he χ2zhi jun xiao yu 0.1,shui ming Weibulllhan shu dui han shui lv bi qu xian de ni ge xiao guo jiao hao 。dui dao gu re feng 、zhen kong Weibulllhan shu yu ce mo xing jin hang shi yan yan zheng ,fa xian mo xing yu ce zhi yu shi yan zhi de xiang dui wu cha jun di yu 10%,shui ming dao gu re feng ji zhen kong gan zao Weibulllhan shu yu ce mo xing de yu ce zhun que du jiao gao 。（2）tong guo re feng 、zhen kong er ci hui gui tong yong xuan zhuai shi yan ,jian li bu tong gan zao fang shi chan zhi biao shu xue mo xing bing jin hang xian zhe xing jian yan 、fang cha ji xiang ying mian fen xi ,yan jiu ge yin su dui chan zhi biao de xian zhe xing ying xiang cheng du 。tong guo gui yi hua chu li he jia quan ping fen de dao bu tong quan chong bi xia de 7zu zeng ge zhi biao zhi bing jin hang gong yi can shu you hua 。jie guo xian shi :re feng wen du dui ping jun gan zao su lv rhe bao yao lv bde ying xiang fei chang xian zhe ,dui chan wei neng hao eying xiang yi ban xian zhe ;feng su dui ping jun gan zao su lv rhe chan wei neng hao eying xiang fei chang xian zhe ,dui bao yao lv bying xiang bu xian zhe 。zhen kong wen du dui suo you zhi biao ying xiang jun fei chang xian zhe ;zhen kong du dui gan zao su lv rhe chan wei neng hao eying xiang fei chang xian zhe ,dui bao yao lv bying xiang yi ban xian zhe 。suo you chan mu biao mo xing de jue ding ji shu R2、jiao zheng ji shu Adj R2、yu ce jue ding ji shu Pred R2dou chao guo 0.9yi shang ,bian yi ji shu C.V.%zhi dou di yu 10%,shui ming mo xing ni ge xiao guo hao ,ke xin du gao 。re feng gan zao de zui you can shu zu ge wei :wen du 35℃、feng su 0.6m/s,ci shi de ping jun gan zao su lv rwei 0.000685g/（g?min）,bao yao lv bwei 7%,chan wei neng hao ewei 6552kJ/kg。zhen kong gan zao zui you can shu zu ge wei :wen du 44℃、zhen kong du 0.05Mpa。ci shi de ping jun gan zao su lv rwei 0.000363g/（g?min）,bao yao lv bwei 7.3%,chan wei neng hao ewei 2988kJ/kg。（3）zai chan yi gan zao fang shi yan jiu ji chu shang ,tong guo re feng -zhen kong lian ge gan zao si yuan er ci BBD（Box-Behnken Design）shi yan ,jian li lian ge gan zao fang shi xia de chan zhi biao shu xue mo xing bing jin hang xian zhe xing jian yan 、fang cha ji xiang ying mian fen xi ,yan jiu dao gu re feng -zhen kong lian ge gan zao fang shi xia ge yin su dui ping jia zhi biao de ying xiang cheng du 。tong guo gui yi hua chu li he jia quan ping fen de dao bu tong quan chong bi xia de 11zu zeng ge zhi biao zhi bing jin hang gong yi can shu you hua ,bing dui bi fen xi lian ge gan zao jiao chan yi gan zao fang shi de you shi te dian 。jie guo xian shi :re feng wen du T0dui ping jun gan zao su lv rhe bao yao lv bde ying xiang fei chang xian zhe ,dui chan wei neng hao eying xiang bu xian zhe 。re feng feng su vdui ping jun gan zao su lv rying xiang bu xian zhe ,dui bao yao lv bhe chan wei neng hao eying xiang fei chang xian zhe 。zhuai huan dian han shui lv Mhe zhen kong wen du T1dui san ge chan zhi biao ying xiang dou fei chang xian zhe 。suo you chan zhi biao mo xing de jue ding ji shu R2、jiao zheng ji shu Adj R2he yu ce jue ding ji shu Pred R2dou chao guo 0.9yi shang ,bian yi ji shu C.V.%zhi dou di yu 10%,shui ming mo xing ni ge xiao guo hao ,ke xin du gao 。zui you gong yi can shu zu ge wei Y（3:6:1）:T0=40℃v=0.7m/s M=20.7%T1=38.1℃（V=0.05Mpa）,dui ying de ping jun gan zao su lv rwei 0.000483g/（g?min）,bao yao lv bwei 6.3%,chan wei neng hao ewei 2612kJ/kg。jiang lian ge gan zao zui you can shu zu ge dui ying de chan mu biao zhi yu chan yi gan zao fang shi zui you can shu zu ge dui ying de chan mu biao zhi jin hang bi jiao fen xi fa xian dao gu lian ge gan zao fang shi jiao chan yi gan zao fang shi you shi ming xian 。（4）tong guo re feng gan zao liang yin su san shui ping quan mian shi yan ,dui re feng gan zao ?chuan di jin hang shen ru jie xi ,kao cha wen du he feng su dui re ?ji liu dong ?xiao lv de ying xiang gui lv 。tong guo dao gu re feng gan zao neng liang li yong xiao lv he gan zao ji tong neng hao jie gou de fen xi ,dui re feng gan zao ji tong jin hang neng xiao ping jia 。jie guo xian shi :sui zhao wen du de sheng gao ping jun re ?xiao lv jiang di er ping jun liu dong ?xiao lv sheng gao ,sui zhao feng su de sheng gao ping jun re ?xiao lv he ping jun liu dong ?xiao lv jun jiang di 。feng su 0.5m/stiao jian xia bu tong wen du dui ying de ping jun re ?he ping jun liu dong ?xiao lv zhi zui gao ,40、50、60℃dui ying de ping jun re ?he ping jun liu dong ?xiao lv fen bie wei :0.683、0.679、0.602,0.275、0.397、0.466。zeng ge bi jiao ping jun re ?xiao lv he ping jun liu dong ?xiao lv ke zhi ,50℃、0.5m/stiao jian xia de zeng ge ?xiao lv zui gao 。er you neng liang li yong xiao lv he gan zao ji tong neng hao jie gou fen xi ke zhi neng xiao zui you tiao jian wei 50℃、0.5m/s,gai tiao jian xia de dao gu gan zao neng hao wei 0.27kW?h,yu ?xiao lv fen xi jie guo xiang yi zhi 。
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论文详细介绍
论文作者分别是来自西南大学的孟国栋，发表于刊物西南大学2019-09-24论文，是一篇关于稻谷论文,热风干燥论文,真空干燥论文,联合干燥论文,工艺优化论文,西南大学2019-09-24论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自西南大学2019-09-24论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。