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| 1 | 管式炉中温度对玉米秸秆慢速热解特性的影响分析显示文摘热解终温和升温速率是玉米秸秆热解的重要影响因素。基于玉米秸秆慢速热解原理,采用热重和管式炉热解取样方法对玉米秸秆的慢速热解特性进行实验分析。取升温速率(20℃/min,30℃/min,40℃/min,50℃/min,60℃/min)和终温(300℃,400℃,500℃,600℃,700℃)作为影响因素,以热解产物(残炭、生物质焦油和热解气体)的产率作为评价分析指标,并对不同终温条件下的热解气体成分进行定量分析。试验结果表明,随着升温速率的增加(20~60℃/min),残炭产率和气体产率略有变化;而焦油产率有较大幅度的提升,可从12%提升至18%。热解终温的升高,使固体残渣中的挥发分进一步析出,残炭产率下降;终温为600℃时,焦油产率达到极大峰值,最高可达18%,峰值温度前,焦油产率随终温的增加而增加,当终温大于峰值温度后,焦油产率迅速减少;气体产率随温度的升高而增加,热值也随之增加,在700℃时,低位热值为10.22MJ/Nm^3。 | 庞赟佶 王宏东 陈义胜 邹振宇 王丽 何丽娟 | 2017 | 科学技术与工程2017，17，19： | 6 |
| 2 | Influence of the Addition of Cotton Stalk during Co-pyrolysis with Sewage Sludge on the Properties, Surface Characteristics, and Ecological Risks of Biochars显示文摘Sewage sludge produced by municipal sewage treatment plants can potentially be used as a biomass energy source because of its high organic content.Presently,the conversion and utilization of rapidly growing amounts of sewage sludge represent an urgent challenge in China.Thermal conversion of sewage sludge to biochar through pyrolysis is a promising solution to this problem.However,biochar produced by pyrolysis of sewage sludge alone has a poor pore structure as a result of its low C content and high ash content.Furthermore,it is enriched in heavy metals that may pose high ecological risks.In this study,we addressed these issues through co-pyrolysis of sewage sludge and cotton stalks(1:1,wt./wt.)at different pyrolysis temperatures ranging from 350℃ to 750℃.The properties and surface characteristics of the biochars were investigated.Meanwhile,the transformation behavior of heavy metals during the co-pyrolysis process was studied,and the potential ecological risks of heavy metals in biochars were assessed.The results showed that elevated pyrolysis temperatures reduced the biochar yield and C content of the biochars,whereas such temperatures increased the pH value and ash content of the biochars.The biochars prepared at different pyrolysis temperatures were all mesoporous materials.The elevated temperatures promoted the transformation of heavy metals from mobile fractions to stable ones,thus resulting in a significant decrease in the ecological risks.In summary,co-pyrolysis of sewage sludge with cotton stalks proved to be a feasible method for the conversion and utilization of sewage sludge. | WANG Zhipu WANG Jian XIE Like ZHU Henan SHU Xinqian | 2019 | Journal of Thermal Science2019，28，4： | 5 |
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