YAN Hongchi;CHEN Xinke;MA Lun;SU Xianqiang;FANG Qingyan;

• 1:State Key Laboratory of Coal Combustion
• 2:Huazhong University of Science and Technology

Abstract：

In the process of biomass storage and transportation, there exists the phenomenon of self-heating caused by microbial growth and metabolism heat production, which may cause spontaneous combustion of biomass. Water content is an important factor affecting microbial growth, metabolism and heat production. In this paper, a 120 L self-heating insulation test chamber was designed and built. The effects of water content on self-heating characteristics of corn straw were studied in the range of 20%-95% water content. Temperature and oxygen consumption rate were used to characterize the degree of self-heating and microbial metabolic activity, respectively. The results show that the maximum temperature and peak heat production of corn straw in the process of self-heating increases firstly, and then decreases with the increase of moisture content. The maximum temperature is 41.1 ℃ under 50% moisture content, and the maximum peak heat production is 157 J/(s·m~3) under 80% moisture content. The peak heat production of corn straw is affected by moisture content. When the water content is lower than 35%, the difference of peak heat production is small. When the water content is between 35% and 80%, the peak heat production shows a linear relationship with the water content, and the average increase of peak heat production is 33.43 J/(s·m~3) when the water content increases by 15%. When the water content exceeds 80%, the peak heat production decreases.The specific growth rate of microorganisms is directly proportional to the oxygen consumption rate, and both of them increase firstly, and then decrease with the increase of water content. The oxygen consumption rate reaches the maximum value of 0.056%/min under 80% water content, indicating the strongest metabolic activity of microorganisms. The research results provide reference for analyzing the self-heating characteristics of corn straw and proposing the safe storage and transportation measures of biomass.

Key Words： corn straw;microorganism;self-heating;water content

Abstract:

Keywords:

Foundation: 国家重点研发计划政府间国际科技创新合作资助项目(2021YFE0107300);; 中央高校基本科研业务费专项资金资助项目(YCJJ202203009)

Authors: YAN Hongchi;CHEN Xinke;MA Lun;SU Xianqiang;FANG Qingyan;

DOI: 10.13226/j.issn.1006-6772.SG23011101

References：

• [1] 张智刚，康重庆.碳中和目标下构建新型电力系统的挑战与展望[J].中国电机工程学报，2022,42 (8):2806-2819.ZHANG Zhigang,KANG Chongqing.Challenges and prospects for constructing the new-type power system towards a carbon neutrality future[J].Proceedings of the CSEE,2022,42(8):2806-2819.
• [2] 胡鞍钢.中国实现2030年前碳达峰目标及主要途径[J].北京工业大学学报(社会科学版),2021,21(3):1-15.HU Angang.China′s goal of achieving carbon peak by 2030 and its main approaches[J].Journal of Beijing University of Technology (Social Sciences Edition),2021,21(3):1-15.
• [3] 王灿，张雅欣.碳中和愿景的实现路径与政策体系[J].中国环境管理，2020,12(6):58-64.WANG Can,ZHANG Yaxin.Implementation pathway and policy system of carbon neutrality vision[J].China Journal of Environmental Management,2020,12(6):58-64.
• [4] 金安，李建华，高明，等.生物质发电技术研究与应用进展[J].能源研究与利用，2022(5):19-24.JIN An,LI Jianhua,GAO Ming,et al.Research and application progress of biomass power generation technology[J].Energy Research & Utilization,2022(5):19-24.
• [5] 石元春.我国生物质能源发展综述[J].智慧电力，2017,45(7):1-5.SHI Yuanchun.Overview of biomass energy development in China[J].Smart Power,2017,45(7):1-5.
• [6] 樊篱.农业废弃物直燃发电项目的风险研究[D].北京：华北电力大学，2010.
• [7] 张艳丽，王飞，赵立欣，等.我国秸秆收储运系统的运营模式，存在问题及发展对策[J].可再生能源，2009,27 (1):1-5.ZHANG Yanli,WANG Fei,ZHAO Lixin,et al.The operating model,existing problems and development strategies for China′s straw storge and transportation system[J].Renewable Energe Resources,2009,27(1):1-5.
• [8] 胡海涛，李允超，王贤华，等.生物质预处理技术及其对热解产物的影响综述[J].生物质化学工程，2014,48 (1):44-50.HU Haitao,LI Yunchao,WANG Xianhua,et al.A review of biomass pretreatment technologies and their influences on pyrolysis products[J].Biomass Chemical Engineering,2014,48(1):44-50.
• [9] MORENO V C,COZZANI V.Major accident hazard in bioenergy production[J].Journal of Loss Prevention in the Process Industries,2015,35:135-144.
• [10] SEAY J,LUNGHI E,REHMAN A,et al.Analysis of accident data for the bioenergy sector based on second generation feedstocks[J].Chemical Engineering Transactions,2017,57:781.
• [11] PHANPHANICH M,MANI S.Impact of torrefaction on the grindability and fuel characteristics of forest biomass[J].Bioresource Technology,2011,102 (2):1246-1253.
• [12] DARR M J,SHAH A.Biomass storage:An update on industrial solutions for baled biomass feedstocks[J].Biofuels,2012,3 (3):321-332.
• [13] EMERY I R,MOSIER N S.The impact of dry matter loss during herbaceous biomass storage on net greenhouse gas emissions from biofuels production[J].Biomass and Bioenergy,2012,39 (8):237-246.
• [14] ARMSTRONG J.Spontaneous combustion of forest fuels:A review[M].Ottawa:Forest Fire Research Institute,1973.
• [15] HOGLANDW,MARQUES M.Physical,biological and chemical processes during storage and spontaneous combustion of waste fuel[J].Resources,Conservation and Recycling,2003,40 (1):53-69.
• [16] DIXON T.Spontaneous combustion in bagasse stockpiles[C]//Proceedings of the Australian Society of Sugar Cane Technologists.Australia:Australian Society of Sugar Cane Technologists,1988.
• [17] LI X R,KOSEKI H,MOMOTA M.Evaluation of danger from fermentation-induced spontaneous ignition of wood chips[J].Journal of Hazardous Materials,2006,135(1/3):15-20.
• [18] FERRERO F,LOHRER C,SCHMIDT B M,et al.A mathematical model to predict the heating-up of large-scale wood piles[J].Journal of Loss Prevention in the Process Industries,2009,22 (4):439-448.
• [19] KRIGSTIN S,HELMESTE C,JIA H,et al.Comparative anal-ysis of bark and woodchip biomass piles for enhancing predictability of self-heating[J].Fuel,2019,242:699-709.
• [20] SCHWARZER L,SáROSSY Z,JENSEN P A,et al.Kinetic parameters for biomass at self-ignition conditions - low temperature oxidation and pyrolysis[J].Energy & Fuels,2019,33 (9):8606-8619.
• [21] SOTO-GARCIA L,HUANG X,THIMMAIAH D,et al.Measurement andmodeling of carbon monoxide emission rates from multiple wood pellet types[J].Energy & Fuels,2015,29 (6):3715-3724.
• [22] EVERARD C D,FINNAN J,MCDONNELL K P,et al.Evaluation of self-heating in Miscanthus x giganteus energy crop clamps and the implications for harvesting time[J].Energy,2013,58 350-356.
• [23] WENDT L M,BONNER I J,HOOVER A N,et al.Influence of airflow on laboratory storage of high moisture corn stover[J].BioEnergy Research,2014,7(4):1212-1222.
• [24] 陈汉平，李斌，杨海平，等.生物质燃烧技术现状与展望[J].工业锅炉，2009(5):1-7.CHEN Hanping,LI Bin,YANG Haiping,et al.Status and prospect of biomass combustion technology[J].Industrial Boilers,2009(5):1-7.
• [25] 范朋慧，张辉，盛昌栋.生物质燃料自加热、自燃及其防范综述[J].生物质化学工程，2014,48 (4):51-56.FAN Penghui,ZHANG Hui,SHENG Changdong.Review on self-heating and spontaneous combustion of biomass fuels and their prevention[J].Biomass Chemical Engineering,2014,48(4):51-56.
• [26] 田晓芳，盛昌栋.稻草储存过程中自加热特性的研究[J].新能源进展，2018,6 (2):96-101.TIAN Xiaofang,SHENG Changdong.Investigation on self-heating of rice straw during storge[J].Advances in New and Renewable Energy,2018,6(2):96-101.
• [27] KRIGSTIN S,HELMESTE C,WETZEL S,et al.Managing self-heating & quality changes in forest residue wood waste piles[J].Biomass and Bioenergy,2020,141:105659.
• [28] PECENKA R,LENZ H,IDLER C.Influence of the chip format on the development of mass loss,moisture content and chemical composition of poplar chips during storage and drying in open-air piles[J].Biomass & Bioenergy,2018,116:140-150.
• [29] REZAEI F,VANDERGHEYNST J S.Critical moisture content for microbial growth in dried food-processing residues[J].Journalof the Science of Food and Agriculture,2010,90(12):2000-2005.
• [30] REDDY A P,JENKINS B M,VANDERGHEYNST S J.The critical moisture range for rapid microbial decomposition of rice straw during storage[J].Transactions of the ASABE,2009:52(2):673-677.
• [31] ZHU Y,ZHANG H,SHENG C.Characterizing self-heating of cereal straws by isothermal microcalorimetry[J].Thermochimica Acta,2021,698:178881.
• [32] MEYER L,BRISCHKE C.Fungal decay at different moisture levels of selected European-grown wood species[J].International Biodeterioration & Biodegradation,2015,103:23-29.
• [33] BRISCHKE C,ALFREDSEN G.Wood-water relationships and their role for wood susceptibility to fungal decay[J].Applied Microbiology and Biotechnology,2020,104 (9):3781-3795.
• [34] TANG Y,ZHOU J.Laboratory investigation on the spontaneous combustion of a lignocellulosic biomass and its suppression by chemical inhibitors[J].Energy & Fuels,2020,34(4):4693-4702.
• [35] TIAN X,ZHANG H,SHENG C.Self-heating of agricultural residues during storage and its impact on fuel properties[J].Energy & Fuels,2017,32(4):4227-4236.
• [36] PHOUNGLAMCHEIK A,JOHNSON N,KIENZL N,et al.Self-heating of biochar during postproduction storage by O2 chemisorption at low temperatures[J].Energies,2022,15(1):380.
• [37] LARSSON I,L?NNERMARK A,BLOMQVIST P,et al.Measurement of self-heating potential of biomass pellets with isothermal calorimetry[J].Fire and Materials,2017,41(8):1007-1015.
• [38] ZHU Y,ZHANG H,SHENG C.Characterizing self-heating of cereal straws by isothermal microcalorimetry[J].Thermochimica Acta,2021,698:178881.
• [39] KRIGSTIN S,HELMESTE C,WETZEL S,et al.Managing self-heating & quality changes in forest residue wood waste piles[J].Biomass and Bioenergy,2020,141:105659.
• [40] ROUTA J,BR?NNSTR?M H,LAITILA J.Effects of storage on dry matter,energy content and amount of extractives in Norway spruce bark[J].Biomass and Bioenergy,2020,143:105821.
• [41] RYCKEBOER J,MERGAERT J,VAES K,et al.A survey of bacteria and fungi occurring during composting and self-heating processes[J].Annals of Microbiology,2003,53 (4):349-410.
• [42] BUGGELN R,RYNK R.Self-heating in yard trimmings:Conditions leading to spontaneous combustion[J].Compost Science & Utilization,2002,10(2):162-182.
• [43] GRAY B,SEXTON M,HALLIBURTON B,et al.Wetting-induced ignition in cellulosic materials[J].Fire Safety Journal,2002,37 (5):465-479.
• [44] JIRJIS R.Effects of particle size and pile height on storage and fuel quality of comminuted Salix viminalis[J].Biomass and Bioenergy,2005,28(2):193-201.