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木屑熱解揮發(fā)物冷凝特性研究
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科技部農業(yè)科技成果轉化資金項目(20150237)和廣東省科技計劃項目(20160221)


Condensation Characteristics of Volatile Matter from Sawdust Pyrolysis
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    摘要:

    在自行設計的生物質熱解揮發(fā)物兩級冷凝特性參數測試系統(tǒng)上,進行了木屑在450,、550,、650℃下熱解揮發(fā)物冷凝特性研究,,其中,一級冷凝采用空氣作為冷凝介質,,二級冷凝采用水作為冷凝介質,,計算了表面局部冷凝換熱系數,以及冷凝液膜熱阻和厚度,。結果表明:一級冷凝換熱系數隨著溫度的升高而減小,,在熱解溫度為450℃時達到最大值671.02W/(m2·K);二級換熱系數隨著溫度的升高先增大后減小,,在熱解溫度為550℃時達到最大值1.484×105W/(m2·K),。基于冷凝器內壁一維穩(wěn)態(tài)冷凝換熱特性,,分析了冷凝液膜形成過程,,存在3個階段:液膜形成、液膜積累,、液膜流動,。在液膜形成和積累階段,液膜厚度逐漸增大,,熱阻變大,;液膜厚度達到一定程度后,冷凝液產生流動,,在液膜流動初期,,液膜厚度逐漸減小,熱阻變??;在穩(wěn)定流動期,熱阻基本保持穩(wěn)定,。

    Abstract:

    Pyrolysis is a relatively simple, inexpensive, and robust thermochemical technology for transforming biomass into bio-oil, biochar and syngas. While the intention of slow pyrolysis is to produce mainly charcoal, fast pyrolysis is meant to convert biomass to a maximum quantity of liquids (bio-oil). Biochar can be used with existing infrastructure as a replacement for pulverized coal, bio-oil can be used as a fuel in existing industrial boilers. The pyrolysis of sawdust contains volatile bio-oil and non-condensing gas, so the condensation characteristics are different from those of other simple mixture. Based on the test system of biomass pyrolysis volatile matter condensation characteristic parameter, the experiment of condensation characteristics of pyrolysis volatile was carried out at 450℃, 550℃ and 650℃. The condensation characteristics of volatile matter produced at different pyrolysis temperatures were tested, and the heat transfer coefficient, the thermal resistance and thickness of condensation liquid film were calculated. Based on the one-dimensional heat transfer characteristics of liquid condensation, the condensate film formation process had three stages: formation, accumulation and flow of liquid film. The results showed that the first stage condensation heat transfer coefficient was decreased with the increase of temperature, biomass volatile surface heat transfer coefficient at 450℃ was the highest,,which was 671.02W/(m2·K);with the increase of temperature, the heat transfer coefficient of the second stage was increased first and then decreased, biomass volatile surface heat transfer coefficient at 550℃ was the highest, which was 1.484×105W/(m2·K). According to the experimental value and the hypothesis of condensate film, in the film formation and accumulation stage, the film thickness was gradually increased and the thermal resistance was decreased;early in the liquid film flow stage, with the decrease of the film thickness, the thermal resistance was decreased;in the steady flow stage, resistance was remained stable. The research result can provide reference for the on-line collection of bio-oil and the design of bio-oil condenser in continuous pyrolysis equipment.

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王明峰,陳志文,蔣恩臣,任永志,韓平,孫焱.木屑熱解揮發(fā)物冷凝特性研究[J].農業(yè)機械學報,2017,48(4):271-275,,223. WANG Mingfeng, CHEN Zhiwen, JIANG Enchen, REN Yongzhi, HAN Ping, SUN Yan. Condensation Characteristics of Volatile Matter from Sawdust Pyrolysis[J]. Transactions of the Chinese Society for Agricultural Machinery,2017,48(4):271-275,223.

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  • 收稿日期:2016-07-28
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  • 在線發(fā)布日期: 2017-04-10
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