脱水污泥/生物质移动床混合热解-气化的协同效应
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摘要
以一定比例松木锯末、枯枝、落叶混合物作为生物质原料,在自制的移动床气化炉上研究脱水污泥/生物质的混合热解-气化行为,探讨不同掺混比(0%～100%)和炉温(800～900℃)下热解-气化过程对产物分布、气体成分和气化特性的协同效果。结果表明:添加生物质能有效提高气体产率并减少液体产物的生成。混合热解-气化对气体产物具有明显的协同作用,协同参数Vsyn在掺混比为50%时最高,并随炉温的升高而增大。气体产物组分同样受到2种原料共同作用的影响,炉温为800～900℃内,H_2和CO含量的实验值比理论计算值分别高10.75%～12.05%和6.35%～7.55%,CO_2含量则偏低7.55%～11.7%。在炉温850℃、生物质掺混比为50%的条件下,脱水污泥/生物质混合热解-气化干气产率达到0.56 Nm~3/kg,气体热值10.08 MJ/Nm~3,碳转化率73.06%。
Pyrolysis-gasi?cation behavior of dewatered sewage sludge and biomass was studied in a lab-scale moving bed gasi?er. The biomass feedstock is the mixture of pine sawdust and litter according to a certain proportion. Synergistic effects on products distribution,gas composition and gasification performance were investigated at biomass blend ratio from 0 to 100% and gasifier temperature from 800 ℃ to 900 ℃. The results showed that biomass blend can increase gas yield and the decrease liquid yield. A positive synergistic effect on gas yield is found in the pyrolysis-gasification process.The Vsynvalue can reach the maximum at 50% biomass blend ratio,increasing with the increase of gasifier temperature.Composition of fuel gas from the pyrolysis-gasification is also affected by blending of the two feedstock. The experimental values of H_2 and CO concentrations are higher than the calculated values by 10.75%-12.05% and 6.35%-7.55%,respectively. However,CO_2 concentrations are 7.55%-11.7% lower than the calculated values. At 850 ℃ gasifier temperature and 50% biomass blend ratio,the dry gas yield,heating value of the gas and carbon conversion efficiency are respectively 0.56 Nm~3/kg,10.08 MJ/Nm~3 and 73.06%.
Pyrolysis-gasi?cation behavior of dewatered sewage sludge and biomass was studied in a lab-scale moving bed gasi?er. The biomass feedstock is the mixture of pine sawdust and litter according to a certain proportion. Synergistic effects on products distribution,gas composition and gasification performance were investigated at biomass blend ratio from 0 to 100% and gasifier temperature from 800 ℃ to 900 ℃. The results showed that biomass blend can increase gas yield and the decrease liquid yield. A positive synergistic effect on gas yield is found in the pyrolysis-gasification process.The Vsynvalue can reach the maximum at 50% biomass blend ratio,increasing with the increase of gasifier temperature.Composition of fuel gas from the pyrolysis-gasification is also affected by blending of the two feedstock. The experimental values of H_2 and CO concentrations are higher than the calculated values by 10.75%-12.05% and 6.35%-7.55%,respectively. However,CO_2 concentrations are 7.55%-11.7% lower than the calculated values. At 850 ℃ gasifier temperature and 50% biomass blend ratio,the dry gas yield,heating value of the gas and carbon conversion efficiency are respectively 0.56 Nm~3/kg,10.08 MJ/Nm~3 and 73.06%.
引文
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[17]熊思江,章北平,冯振鹏,等.湿污泥热解制取富氢燃气影响因素研究[J].环境科学学报,2010,30(5):996—1001.[17] Xiong Sijiang,Zhang Beiping,Feng Zhenpeng,et al.The effect of experimental conditions on wet sludge pyrolysis for hydrogen-rich fuel gas[J]. Acta Scientiae Circumstantiae,2010,30(5):996—1001.
[18] Couto N D, Silva V B, Rouboa A. Assessment on steam gasification of municipal solid waste against biomass substrates[J]. Energy Conversion and Management,2016,124:92—103.
[19] Luo Siyi,Feng Yu. The production of hydrogen-rich gas by wet sludge pyrolysis using waste heat from blastfurnace slag[J]. Energy,2016,113:845—851.
[2]王晓磊,邓文义,于伟超,等.污泥微波高温热解条件下富氢气体生成特性研究[J].燃料化学学报,2013,41(2):243—251.[2] Wang Xiaolei, Deng Wenyi, Yu Weichao, et al.Hydrogen-rich gas formation characteristics during microwave-induce d high temperature pyrolysis of se wage sludge[J]. Journal of Fuel Chemistry and Technology,2013,41(2):243—251.
[3]熊思江,章北平,玉东科,等.干燥污泥与含水污泥的热解动力学研究[J].华中科技大学学报:自然科学版,2011,39(2):124—128.[3] Xiong Sijiang,Zhang Beiping,Yu Dongke,et al. Study on pyrolysis kinetics of dried and wet sewage sludge[J].Huazhong University of Science&Technology:Natural Science Edition,2011,39(2):124—128.
[4] Samolad M C,Zabaniotou A A. Comparative assessment of municipal sewage sludge incineration,gasification and pyrolysis for a sustainable sludge-to-energy management in Greece[J]. Waste Management,2014,34(2):411—420.
[5]金湓,李宝霞.生物质与污水污泥共热解特性研究[J].可再生能源,2014,32(2):234—238.[5] Jin Pen, Li Baoxia. The study of co-pyrolysis characteristics of the biomass and sewage sludge[J].RenewableEnergyResources,2014,32(2):234—238.
[6] Zhang Beiping, Xiong Sijiang, Xiao Bo, et al.Mechanism of wet sewage sludge pyrolysis in a tubular furnace[J]. International Journal of Hydrogen Energy,2011,36(1):355—363.
[7] Nipattummakul N, Ahmed I, Kerdsuwan S, et al.Hydrogen and syngas production from sewage sludge via steam gasi?cation[J]. Fuel&Energy Abstracts,2010,35(21):11738—11745.
[8] De Andrés J M,Narros A,Rodríguez M E,et al.Behaviour of dolomite,olivine and alumina as primary catalysts in air-steam gasi?cation of sewage sludge[J].Fuel,2011,90(2):521—527.
[9] Nipattummakul N,Ahmed I,Kerdsuwan S,et al. High temperature steam gasi?cation of wastewater sludge[J].Apply Energy,2010,87(12):3729—3734.
[10]焦李,蔡海燕,何丕文,等.脱水污泥/松木锯末水蒸气共气化研究[J].环境科学学报,2013,33(4):1098—1103.[10] Jiao Li,Cai Haiyan,He Piwen,et al. Steam cogasification of dewatered sewage sludge and pine sawdust[J]. Acta Scientiae Circumstantiae,2013,33(4):1098—1103.
[11]张双全,武娜,董明建,等.城市污泥与玉米秸秆共热解制备吸附剂的研究[J].中国矿业大学学报,2011,40(5):799—803.[11] Zhang Shuangquan,Wu Na,Dong Mingjian,et al.Research on preparation of adsorbents by co-pyrolysis of sewage sludge with corn straw[J]. Journal of China University of Mining&Technology,2011,40(5):799—803.
[12]王建飞,赵建涛,李风海,等.烟煤与生物质快速共热解产物特性分析[J].燃料化学学报,2015,43(6):641—648.[12] Wang Jianfei,Zhao Jiantao,Li Fenghai,et al. Product characteristics for fast co-pyrolysis of bituminous coal and biomass[J]. Journal of Fuel Chemistry and Technology,2015,43(6):641—648.
[13] Lyu Pengmei,Yuan Zhenhong,Ma Longlong,et al.Hydrogen-rich gas production from biomass air and oxygen/steam gasi?cation in a downdraft gasi?er[J].Renewable Energy,2007,32(13):2173—2185.
[14] Lyu Pengmei,Xiong Zuhong,Chang Jie,et al. An experimental study on biomass air-steam gasi?cation in a?uidized bed[J]. Bioresource Technology,2004,95:95—101.
[15] Mastellone M L,Zaccariello L,Arena U,et al. Co-gasi?cation of coal,plastic waste and wood in a bubbling?uidized bed reactor[J]. Fuel, 2010, 89(10):2991—3000.
[16] Burton A,Wu Hongwei. Diagnosis of bed agglomeration during biomass pyrolysis in fluidized-bed at a wide range of temperatures[J]. Fuel, 2016,179:103—107.
[17]熊思江,章北平,冯振鹏,等.湿污泥热解制取富氢燃气影响因素研究[J].环境科学学报,2010,30(5):996—1001.[17] Xiong Sijiang,Zhang Beiping,Feng Zhenpeng,et al.The effect of experimental conditions on wet sludge pyrolysis for hydrogen-rich fuel gas[J]. Acta Scientiae Circumstantiae,2010,30(5):996—1001.
[18] Couto N D, Silva V B, Rouboa A. Assessment on steam gasification of municipal solid waste against biomass substrates[J]. Energy Conversion and Management,2016,124:92—103.
[19] Luo Siyi,Feng Yu. The production of hydrogen-rich gas by wet sludge pyrolysis using waste heat from blastfurnace slag[J]. Energy,2016,113:845—851.