杉木UF浸漬材過(guò)熱蒸汽干燥—高溫?zé)崽幚硖匦匝芯?/H1>
發(fā)布時(shí)間：2018-03-16 11:39
本文選題：過(guò)熱蒸汽 切入點(diǎn)：干燥 出處：《中南林業(yè)科技大學(xué)》2017年碩士論文 論文類型：學(xué)位論文
【摘要】：針對(duì)杉木材質(zhì)松軟、密度和強(qiáng)度低、高附加值利用困難等缺陷,本研究以改性UF樹(shù)脂浸漬杉木為研究對(duì)象,采用過(guò)熱蒸汽對(duì)其進(jìn)行快速干燥和高溫?zé)崽幚?系統(tǒng)研究了杉木浸漬材的干燥特性和高溫?zé)崽幚硖匦?獲得了優(yōu)化的干燥和熱處理工藝。研究結(jié)果能為杉木浸漬改性材的工業(yè)化高效干燥和高溫?zé)崽幚?甚至是速生杉木的高附加值利用提供參考和借鑒。本研究的主要研究結(jié)論如下:(1)獲得了 UF樹(shù)脂改性杉木的常規(guī)干燥基準(zhǔn)。采用百度試驗(yàn)法對(duì)UF樹(shù)脂改性杉木進(jìn)行干燥處理,研究了干燥過(guò)程中改性材的初期開(kāi)裂、內(nèi)裂和截面變形的發(fā)生、發(fā)展情況,確定了其干燥缺陷等級(jí)和初步干燥基準(zhǔn),并通過(guò)中試試驗(yàn)獲得了優(yōu)化的常規(guī)干燥基準(zhǔn)。(2)探明了 UF樹(shù)脂改性杉木的過(guò)熱蒸汽干燥特性。與常規(guī)干燥相比,過(guò)熱蒸汽干燥具有明顯的速度優(yōu)勢(shì),且隨著干燥介質(zhì)溫度的升高,干燥速率明顯增加,當(dāng)過(guò)熱蒸汽溫度從120℃升高到150℃,干燥速率提高了 75%;過(guò)熱蒸汽干燥處理對(duì)杉木浸漬材顏色影響不明顯,當(dāng)介質(zhì)溫度從120℃升高到150℃,杉木浸漬材明度平均減小2.28%,紅綠指數(shù)平均減小5.74%,黃藍(lán)指數(shù)平均減小4.01%,色差指數(shù)平均減小2.55%。(3)揭示了 UF樹(shù)脂改性杉木的高溫?zé)崽幚硖匦浴８邷責(zé)崽幚韺?duì)木材顏色、尺寸穩(wěn)定性和力學(xué)強(qiáng)度的影響顯著。當(dāng)熱處理溫度從160℃升高到220℃,試件明度降低11.08%-67.17%,紅綠指數(shù)降低1.80%-17.30%;隨著處理溫度的提高和時(shí)間的延長(zhǎng),木材平衡含水率降低,尺寸穩(wěn)定性增加;與對(duì)照材相比,高溫?zé)崽幚聿牡钠胶夂式档?.25%-37.84%,體積濕脹率、徑向濕脹率和弦向濕脹率分別減少9.20%-49.70%、2.56%-43.85%、5.56%-44.45%;杉木浸漬材的抗彎彈性模量(MOE)和強(qiáng)度、順紋抗壓強(qiáng)度、橫紋全部和局部抗壓比例極限應(yīng)力均呈下降趨勢(shì),抗彎彈性模量下降1.0%-11.4%,抗彎強(qiáng)度下降8.2%-65.1%,順紋抗壓強(qiáng)度下降2.7%-17.3%,橫紋全部弦向和徑向抗壓比例極限應(yīng)力分別下降3.0%-60.9%、11.2%-59.6%,橫紋局部弦向和徑向抗壓比例極限應(yīng)力分別下降0.43%-36.5%、0.87%-56.5%。高溫?zé)崽幚韺?duì)木材結(jié)晶區(qū)沒(méi)有明顯影響,但高溫?zé)崽幚韺?duì)杉木浸漬材木材結(jié)晶度的影響明顯。高溫?zé)崽幚韺?duì)木材燃燒過(guò)程中的熱釋放總量(THR)影響不大,木材在燃燒過(guò)程中質(zhì)量損失與熱量釋放是同步的,浸漬-熱處理材的第二發(fā)煙峰與素材相比發(fā)煙量大大降低,高溫?zé)崽幚砗竽静娜紵^(guò)程的CO濃度增加,對(duì)木材燃燒過(guò)程CO2濃度的影響不明顯。
[Abstract]:Aiming at the defects of Chinese fir wood, such as soft material, low density and strength, difficulty in using high added value, the modified UF resin impregnated Chinese fir was used as the research object, and superheated steam was used for rapid drying and high temperature heat treatment of the modified UF resin impregnated Chinese fir. The drying characteristics and high temperature heat treatment properties of Chinese fir impregnated wood were studied systematically, and the optimized drying and heat treatment technology were obtained. The main conclusions of this study are as follows: (1) the general drying benchmark of UF resin modified Chinese fir was obtained. The UF resin modified Cunninghamia lanceolata (Cunninghamia lanceolata) was treated by Baidu method. The initial cracking, internal crack and cross section deformation of the modified wood during the drying process were studied, and the drying defect grade and the preliminary drying criterion were determined. The superheated steam drying characteristics of Chinese fir modified by UF resin were investigated through the pilot-scale test. Compared with conventional drying, superheated steam drying has obvious speed advantage. With the increase of the temperature of drying medium, the drying rate increased obviously. When the superheated steam temperature increased from 120 鈩，
本文編號(hào)：1619757
本文鏈接：http://sikaile.net/shoufeilunwen/zaizhiyanjiusheng/1619757.html
本文選題：過(guò)熱蒸汽 切入點(diǎn)：干燥 出處：《中南林業(yè)科技大學(xué)》2017年碩士論文 論文類型：學(xué)位論文
【摘要】：針對(duì)杉木材質(zhì)松軟、密度和強(qiáng)度低、高附加值利用困難等缺陷,本研究以改性UF樹(shù)脂浸漬杉木為研究對(duì)象,采用過(guò)熱蒸汽對(duì)其進(jìn)行快速干燥和高溫?zé)崽幚?系統(tǒng)研究了杉木浸漬材的干燥特性和高溫?zé)崽幚硖匦?獲得了優(yōu)化的干燥和熱處理工藝。研究結(jié)果能為杉木浸漬改性材的工業(yè)化高效干燥和高溫?zé)崽幚?甚至是速生杉木的高附加值利用提供參考和借鑒。本研究的主要研究結(jié)論如下:(1)獲得了 UF樹(shù)脂改性杉木的常規(guī)干燥基準(zhǔn)。采用百度試驗(yàn)法對(duì)UF樹(shù)脂改性杉木進(jìn)行干燥處理,研究了干燥過(guò)程中改性材的初期開(kāi)裂、內(nèi)裂和截面變形的發(fā)生、發(fā)展情況,確定了其干燥缺陷等級(jí)和初步干燥基準(zhǔn),并通過(guò)中試試驗(yàn)獲得了優(yōu)化的常規(guī)干燥基準(zhǔn)。(2)探明了 UF樹(shù)脂改性杉木的過(guò)熱蒸汽干燥特性。與常規(guī)干燥相比,過(guò)熱蒸汽干燥具有明顯的速度優(yōu)勢(shì),且隨著干燥介質(zhì)溫度的升高,干燥速率明顯增加,當(dāng)過(guò)熱蒸汽溫度從120℃升高到150℃,干燥速率提高了 75%;過(guò)熱蒸汽干燥處理對(duì)杉木浸漬材顏色影響不明顯,當(dāng)介質(zhì)溫度從120℃升高到150℃,杉木浸漬材明度平均減小2.28%,紅綠指數(shù)平均減小5.74%,黃藍(lán)指數(shù)平均減小4.01%,色差指數(shù)平均減小2.55%。(3)揭示了 UF樹(shù)脂改性杉木的高溫?zé)崽幚硖匦浴８邷責(zé)崽幚韺?duì)木材顏色、尺寸穩(wěn)定性和力學(xué)強(qiáng)度的影響顯著。當(dāng)熱處理溫度從160℃升高到220℃,試件明度降低11.08%-67.17%,紅綠指數(shù)降低1.80%-17.30%;隨著處理溫度的提高和時(shí)間的延長(zhǎng),木材平衡含水率降低,尺寸穩(wěn)定性增加;與對(duì)照材相比,高溫?zé)崽幚聿牡钠胶夂式档?.25%-37.84%,體積濕脹率、徑向濕脹率和弦向濕脹率分別減少9.20%-49.70%、2.56%-43.85%、5.56%-44.45%;杉木浸漬材的抗彎彈性模量(MOE)和強(qiáng)度、順紋抗壓強(qiáng)度、橫紋全部和局部抗壓比例極限應(yīng)力均呈下降趨勢(shì),抗彎彈性模量下降1.0%-11.4%,抗彎強(qiáng)度下降8.2%-65.1%,順紋抗壓強(qiáng)度下降2.7%-17.3%,橫紋全部弦向和徑向抗壓比例極限應(yīng)力分別下降3.0%-60.9%、11.2%-59.6%,橫紋局部弦向和徑向抗壓比例極限應(yīng)力分別下降0.43%-36.5%、0.87%-56.5%。高溫?zé)崽幚韺?duì)木材結(jié)晶區(qū)沒(méi)有明顯影響,但高溫?zé)崽幚韺?duì)杉木浸漬材木材結(jié)晶度的影響明顯。高溫?zé)崽幚韺?duì)木材燃燒過(guò)程中的熱釋放總量(THR)影響不大,木材在燃燒過(guò)程中質(zhì)量損失與熱量釋放是同步的,浸漬-熱處理材的第二發(fā)煙峰與素材相比發(fā)煙量大大降低,高溫?zé)崽幚砗竽静娜紵^(guò)程的CO濃度增加,對(duì)木材燃燒過(guò)程CO2濃度的影響不明顯。
[Abstract]:Aiming at the defects of Chinese fir wood, such as soft material, low density and strength, difficulty in using high added value, the modified UF resin impregnated Chinese fir was used as the research object, and superheated steam was used for rapid drying and high temperature heat treatment of the modified UF resin impregnated Chinese fir. The drying characteristics and high temperature heat treatment properties of Chinese fir impregnated wood were studied systematically, and the optimized drying and heat treatment technology were obtained. The main conclusions of this study are as follows: (1) the general drying benchmark of UF resin modified Chinese fir was obtained. The UF resin modified Cunninghamia lanceolata (Cunninghamia lanceolata) was treated by Baidu method. The initial cracking, internal crack and cross section deformation of the modified wood during the drying process were studied, and the drying defect grade and the preliminary drying criterion were determined. The superheated steam drying characteristics of Chinese fir modified by UF resin were investigated through the pilot-scale test. Compared with conventional drying, superheated steam drying has obvious speed advantage. With the increase of the temperature of drying medium, the drying rate increased obviously. When the superheated steam temperature increased from 120 鈩，
本文編號(hào)：1619757
本文鏈接：http://sikaile.net/shoufeilunwen/zaizhiyanjiusheng/1619757.html
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