冯昱恒,韩梦曦,余天驰,金则陈,胡维杰,张鹏飞,陆利烨,吴乃新
FENG Yuheng,HAN Mengxi,YU Tianchi,JIN Zechen,HU Weijie,ZHANG Pengfei,LU Liye,WU Naixin

• 1:同济大学机械与能源工程学院
• 2:上海新近纪智能科技有限公司
• 3:上海市政工程设计研究总院(集团)有限公司
• 4:华能太仓电厂

摘要(Abstract)：

干化+焚烧技术已逐渐成为我国大中城市中心城区污泥的重要处置手段，水热炭化预处理可提高污泥脱水性能，进而降低系统能耗，但对水热+干化污泥预处置过程的能耗分析还鲜有报道。研究了200～260℃下水热炭化预处理污泥的三相产物分布及水热液有机组分构成，在此基础上建立了水热+空气干化系统的能量-质量流模型，并分析了水热条件对系统能耗的影响，最后与空气干化系统、厌氧发酵+空气干化系统能耗进行对比。发现釜内压力为8 MPa,水热反应温度由200℃上升至240℃时，由于水热液中热值较高的有机组分芳香烃、含氮杂环比例明显下降，水热反应釜能耗由184kJ/kg(以原污泥计)降至161 kJ/kg,温度上升至260℃时，由于水蒸气气相分率明显增加及水热液中芳香烃含量回升，能耗上升至278 kJ/kg。受水蒸气气相分率影响，240℃下水热反应能耗随压力升高而降低，压力升至4 MPa后降低趋势迅速放缓。直接空气干化系统在干化空气温度为110℃时，系统总能耗为1 942 kJ/kg;厌氧消化+干化系统由于对沼气进行高效热回收利用，消化时间为10 d时，系统热耗低至212 kJ/kg,总能耗为984 kJ/kg;而水热炭化+干化系统由于有效提升了污泥脱水性能，使系统总能耗进一步降低，240℃水热温度下系统总能耗为597 kJ/kg。研究结果为污泥独立焚烧或与燃煤电站耦合燃烧前预处理方式的选择和优化提供了基础数据和理论依据。
Drying and incineration technology has gradually become an important disposal method for sludge in the central urban areas of large and medium-sized cities in China. Hydrothermal carbonization can improve the dewatering property of sludge, thereby reducing the energy consumption of the system. However, there are few reports on the energy consumption analysis of hydrothermal and drying sludge pre-disposal process. In this article, the distribution of three-phase products and the organic components of hydrothermal liquid at hydrothermal temperatures from 200 ℃ to 260 ℃ were studied. Based on this, the energy-mass flow model of the hydrothermal and air-drying system was established, and the impact of different hydrothermal conditions on system energy consumption was analyzed. Finally, the energy consumption with air-drying system, and the anaerobic fermentation as well as the air drying system was compared. It is found that when the pressure inside the kettle is 8 MPa, the temperature of hydrothermal reaction is increased from 200 ℃ to 240 ℃.The energy consumption of the hydrothermal reactor decreases from 184 kJ/kg(sludge, the same below) to 161 kJ/kg, mainly due to a significant decrease in the proportions of aromatic hydrocarbons and nitrogen-containing heterocyclic rings in the hydrothermal liquid. When the temperature rises to 260 ℃, the energy consumption increases to 278 kJ/kg due to the significant increase in the vapor phase fraction and the recovery of aromatic hydrocarbon mass. It is found that the energy consumption of hydrothermal reaction at 240 ℃ decreases with the increase of pressure due to the influence of the vapor phase fraction. The decreasing trend slows down rapidly after the pressure increases to 4 MPa. The total energy consumption of the direct air drying system is 1 942 kJ/kg when the drying air temperature is 110 ℃. In the anaerobic digestion and drying system, due to the efficient heat recovery of biogas, the heat consumption is as low as 212 kJ/kg at 10 days′ digestion time, and the total energy consumption is 984 kJ/kg. As for the hydrothermal carbonization and drying system, due to the significant enhancement of the dewatering performance, the total energy consumption can be further reduced, and the energy consumption is 597 kJ/kg at a hydrothermal temperature of 240 ℃. This paper provides basic data and theoretical basis for the selection and optimization of pretreatment methods before sludge incineration independently or coupled combustion in coal-fired power stations.

关键词(KeyWords)： 污水污泥;水热炭化;能耗分析;热干化;预处理;过程模拟
sewage sludge incineration;hydrothermal carbonization;energy consumption analysis;thermal drying;pretreatment;process simulation

Abstract:

Keywords:

基金项目(Foundation): 上海市“科技行动计划”国际合作课题资助项目(22230730300,21230731100);; 上海市“科技创新行动计划”科技支撑碳达峰碳中和专项资助项目(21DZ1209200)

作者(Author): 冯昱恒,韩梦曦,余天驰,金则陈,胡维杰,张鹏飞,陆利烨,吴乃新
FENG Yuheng,HAN Mengxi,YU Tianchi,JIN Zechen,HU Weijie,ZHANG Pengfei,LU Liye,WU Naixin

DOI: 10.13226/j.issn.1006-6772.SG23050501

参考文献(References)：

• [1] 中华人民共和国国家统计局.中国统计年鉴[M].北京：中国统计出版社，2022.
• [2] 戴晓虎.我国城市污泥处理处置现状及机遇[J].建设科技，2011(19):55-59.DAI Xiaohu.The current situation and opportunities of urban sludge treatment and disposal in China [J].Construction Technology,2011(19):55-59.
• [3] RAS M,GIRBAL-NAUHAUSER E,PAULE E,et al.Protein extraction from activated sludge:An analytical approach[J].Water Research,2008,42(8/9):1867-1878.
• [4] 王星.污泥生物处理技术[M].北京：冶金工业出版社，2010.
• [5] 汤连生，罗珍贵，张龙舰，等.污泥脱水研究现状与新认识[J].水处理技术，2016,42(6):12-17.TANG Liansheng,LUO Guigui,ZHANG Longjian,et al.Research status and new understanding of sludge dewatering [J].Water Treatment Technology,2016,42 (6):12-17.
• [6] 李雪怡，梁远，方小锋，等.北京市污泥处理处置现状总结分析[J].中国给水排水，2021,37(22):38-42.LI Xueyi,LIANG Yuan,FANG Xiaofeng,et al.Summary and analysis of the current situation of sludge treatment and disposal in Beijing [J] .China Water Supply and Drainage,2021,37 (22):38-42.
• [7] 高卫民，程寒飞.我国污泥处理处置技术研究进展[J].化工矿物与加工，2023,52(1):71-79.GAO Weimin,CHENG Hanfei.Research progress in sludge treatment and disposal technology in China [J].Chemical Minerals and Processing,2023,52 (1):71-79.
• [8] 柴宝华，李文涛，亓伟，等.我国市政污泥处理处置现状研究[J].新能源进展，2023,11(1):38-44.CHAI Baohua,LI Wentao,QI Wei,et al.Research on the current situation of municipal sludge treatment and disposal in China [J].New Energy Progress,2023,11(1):38-44.
• [9] 胡维杰，孙晓，卢骏营.上海白龙港片区污水处理厂污泥处理处置技术探讨[J].中国给水排水，2016,32(2):1-5.HU Weijie,SUN Xiao,LU Junying.Discussion on sludge treatment and disposal technology of Shanghai Bailonggang Sewage Treatment Plant [J].China Water Supply and Drainage,2016,32(2):1-5.
• [10] 施慧聪.α-Mn2O3的制备及其活化过硫酸盐降解胞外聚合物强化污泥脱水的研究[D].哈尔滨：哈尔滨工业大学，2022.
• [11] 殷琳鑫，余鋆，王智聪，等.城市污泥水热碳化的研究与应用进展[J].当代化工研究，2022(16):4-8.YIN Linxin,YU Yun,WANG Zhicong,et al.Progress in research and application of hydrothermal carbonization of urban sludge [J].Contemporary Chemical Research,2022(16):4-8.
• [12] HAMAWAND I,BAILLIE C.Anaerobic digestion and biogas potential:Simulation of lab and industrial-scale processes[J].Energies,2015,8(1):454-474.
• [13] KARLSSON J.Modeling and simulation of existing biogas plants with SIMBA# Biogas[D].Sweden:Link?ping University,2017.
• [14] RAJENDRAN K,KANKANALA H R,LUNDIN M,et al.A novel process simulation model (PSM) for anaerobic digestion using Aspen Plus[J].Bioresource Technology,2014,168:7-13.
• [15] MENACHO W A,MAZID A M,DAS N.Modelling and analysis for biogas production process simulation of food waste using Aspen Plus[J].Fuel,2022,309:122058.
• [16] MARTíNEZ-RUANO J A,RESTREPO-SERNA D L,CARMONA-GARCIA E,et al.Effect of co-digestion of milk-whey and potato stem on heat and power generation using biogas as an energy vector:Techno-economic assessment[J].Applied Energy,2019,241:504-518.
• [17] MCGAUGHY K,TOUFIQ REZA M.Hydrothermal carbonization of food waste:Simplified process simulation model based on experimental results[J].Biomass Conversion and Biorefinery,2018,8(2):283-292.
• [18] ISCHIA G,FIORI L.Hydrothermal carbonization of organic waste and biomass:A review on process,reactor,and plant modeling[J].Waste and Biomass Valorization,2021,12:2797-2824.
• [19] ERLACH B,HARDER B,TSATSARONIS G.Combined hydrothermal carbonization and gasification of biomass with carbon capture[J].Energy,2012,45(1):329-338.
• [20] GHAVAMI N,?ZDENK?I K,CHIANESE S,et al.Process simulation of hydrothermal carbonization of digestate from energetic perspectives in Aspen Plus[J].Energy Conversion and Management,2022,270:116215.
• [21] FENG Y,YU T,CHEN D,et al.Effect of hydrothermal treat-ment on the steam gasification behavior of sewage sludge:Reactivity and nitrogen emission[J].Energy & Fuels,2018,32(1):581-587.
• [22] FENG Y,YU T,CHEN D,et al.Effect of hydrothermal treatm-ent on the steam gasification behavior of sewage sludge:Reactivity and nitrogen emission[J].Energy & Fuels,2018,32(1):581-587.
• [23] BATSTONE D J,KELLER J,ANGELIDAKI I,et al.The IWA anaerobic digestion model No 1 (ADM1)[J].Water Science and technology,2002,45(10):65-73.
• [24] 冷振东，王敏，郭超.我国城市污泥特性及其资源化[J].科技创新导报，2011(8):152-153.LENG Zhendong,WANG Min,GUO Chao.Characteristics and resource utilization of urban sludge in China [J].Introduction to Science and Technology Innovation,2011 (8):152-153.
• [25] BENNER R,MACCUBBIN A E,HODSON R E.Anaerobic biodegradation of the lignin and polysaccharide components of lignocellulose and synthetic lignin by sediment microflora[J].Applied and Environmental Microbiology,1984,47(5):998-1004.
• [26] ZHAO P,SHEN Y,GE S,et al.Energy recycling from sewage sludge by producing solid biofuel with hydrothermal carbonization[J].Energy Conversion and Management,2014,78:815-821.
• [27] NEYENS E,BAEYENS J,CREEMERS C.Alkaline thermal sludge hydrolysis[J].Journal of Hazardous Materials,2003,97(1/3):295-314.