生物质快速热解及水蒸气气化实验研究
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摘要
对生物质气流床气化过程进行了小型台架实验研究,建立生物质气流床气化小型实验台架,进行生物质快速热解和水蒸气气化的实验,实验表明:温度提高有利于提高产品气的产率、气化过程的碳转化率和气化效率,但温度过高会促进CH_4的重整反应、水气变化反应、降低CO、甲烷含量,从而影响产品气热值。粒径对气化结果有着一定影响,粒径对气化结果的影响主要体现在固相内部升温速率和最终温度上,粒径越小,颗粒升温越快,能达到的最终温度越高。水蒸气气化过程中,适当的水蒸气的通入能大量提高产气中的H_2、CO的占比,提高碳转化率和H_2/CO的比值,碳转化率在S/B比为1.4时达到最大值96%,此时气化效率也高达94%,水蒸气的通入过量会导致炉内温度下降,各项评价指标均开始下降,降低燃气品质。
This paper studies the test characteristics of biomass gasification for small experimental entrained flow bed equipment based on the national science and technology support project integration and demonstration of new mobile fixed bed to generate high-quality biogas. Establish the small experimental entrained flow bed of biomass gasification and take the experiments about rapid pyrolysis of biomass and steam vaporization. Experiment show that the increase of temperature is beneficial to improving the yield of product gas,the carbon conversion rate and gasification efficiency of gasification process,but the temperature will promote CH_4 reforming reaction,water gas change reaction,reduction of CO,methane content,thus affecting calorie value product gas. Particle size also has some influence on the gasification results. The effect of particle size on the gasification results is mainly reflected the rate of temperature increase in the solid-phase interior and the final temperature.The smaller the particle size is,the faster the particle temperature is,and the final temperature can achieve higher. The appropriate input of water vapor can increase the ratio of H_2 and CO in the product gas and the carbon conversion rate and H_2/CO ratio in the steam vaporization process.Thecarbonconversionratecanreachedto 96% andthegasificationefficiencyisashighas 94% whentheS/Bratiois 1.4.whentheinput of water vapor is excessive,the furnace temperature will drop down,the evaluation indexes begin to decline and quality of biogas gets poor.
This paper studies the test characteristics of biomass gasification for small experimental entrained flow bed equipment based on the national science and technology support project integration and demonstration of new mobile fixed bed to generate high-quality biogas. Establish the small experimental entrained flow bed of biomass gasification and take the experiments about rapid pyrolysis of biomass and steam vaporization. Experiment show that the increase of temperature is beneficial to improving the yield of product gas,the carbon conversion rate and gasification efficiency of gasification process,but the temperature will promote CH_4 reforming reaction,water gas change reaction,reduction of CO,methane content,thus affecting calorie value product gas. Particle size also has some influence on the gasification results. The effect of particle size on the gasification results is mainly reflected the rate of temperature increase in the solid-phase interior and the final temperature.The smaller the particle size is,the faster the particle temperature is,and the final temperature can achieve higher. The appropriate input of water vapor can increase the ratio of H_2 and CO in the product gas and the carbon conversion rate and H_2/CO ratio in the steam vaporization process.Thecarbonconversionratecanreachedto 96% andthegasificationefficiencyisashighas 94% whentheS/Bratiois 1.4.whentheinput of water vapor is excessive,the furnace temperature will drop down,the evaluation indexes begin to decline and quality of biogas gets poor.
引文
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[2]BERGMAN P C A,BOERSMA A R,KIEL J H A,et al.Torrefaction for Entrained Flow Gasification of Biomass[J].Energieonderzoek Centrum Nederland,2004:589-600.
[3]BERGMAN P C A,KIEL J H A.Torrefaction for Biomass Upgrading[J].2005.https://www.researchgate.net/publication/228699171_Torrefaction_for_biomass_upgrading.
[4]BIAGINI E,CIONI M,TOGNOTTI L.Development and Characterization of a Lab-Scale Entrained Flow Reactor for Testing Biomass Fuels[J].Fuel,2005,84(12):1524-1534.
[5]赵辉.生物质高温气流床气化制取合成气的机理试验研究[D].浙江大学,2007.
[6]曹小伟.生物质气流床气化特性及半焦气化动力学研究[D].浙江大学,2007.
[7]梅勤峰.气流床条件下生物质气化反应特性研究[D].浙江大学,2010.
[8]ZHOU J,CHEN Q,ZHAO H,et al.Biomass-oxygen Gasification in a High-Temperature Entrained-Flow Gasifier.[J].Biotechnology Advances,2009,27(5):606-611.
[9]ZHAO Y,SUN S,ZHOU H,et al.Experimental Study on Sawdust Air Gasification in an Entrained-Flow Reactor[J].Fuel Processing Technology,2010,91(8):910-914.
[10]ENRIQUE BERGóN,ELENA MIRAVALLES,ELENABERGóN,et al.The Predictive Power of Serumκ/λRatios for Discrimination Between Monoclonal Gammopathy of Undeter-10mined Significance and Multiple Myeloma[J].Clinical Chemical Laboratory Medicine,2005,43(1):32-37.
[11]阴秀丽,罗普凡.生物质循环流化床气化炉的数学模型研究[J].太阳能学报,1996(1):1-8.
[12]陈超.生物质多级高温气化定向制备合成气的特性研究[D].浙江大学,2015.
[13]ZANZI R.Pyrolysis of Biomass[D].Stockholm;Royal Institue of Technology,2001.
[14]TANG J,WU X,WANG J.Kinetic Study of Steam Gasification of Two Mineralogically Different Lignite Chars:An Active Site/Intermediate Model[J].Fuel,2015,141:46-55.
[15]MALEKSHAHIAN M,HILL J M.Effect of Pyrolysis and CO2Gasification Pressure on the Surface Area and Pore Size Distribution of Petroleum Coke[J].Energy&Fuels,2011,25(11):5250-5256.