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徐贵玲,李梦慧,卢平,宋恒衡,梁财,陈晓平.烘焙生物质与煤不同配比混合物的流动及下料特性[J].农业工程学报,2018,34(1):186-192.DOI:10.11975/j.issn.1002-6819.2018.01.025
烘焙生物质与煤不同配比混合物的流动及下料特性
投稿时间:2017-07-20  修订日期:2017-11-28
中文关键词:  生物质  热解    二元混合颗粒  流动特性  下料特性
基金项目:国家自然科学基金(51506100);江苏省高校自然科学研究面上项目(15KJB470008)
作者单位
徐贵玲 1.江苏省物质循环与污染控制重点实验室南京师范大学能源与机械工程学院南京 210042
 
李梦慧 1.江苏省物质循环与污染控制重点实验室南京师范大学能源与机械工程学院南京 210042
 
卢平 1.江苏省物质循环与污染控制重点实验室南京师范大学能源与机械工程学院南京 210042
 
宋恒衡 1.江苏省物质循环与污染控制重点实验室南京师范大学能源与机械工程学院南京 210042
 
梁财 2. 能源热转换及其过程测控教育部重点实验室东南大学能源与环境学院南京 210096
 
陈晓平 2. 能源热转换及其过程测控教育部重点实验室东南大学能源与环境学院南京 210096
 
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中文摘要:在BT-1000粉体综合特性测试仪和有机玻璃下料试验系统上,分别进行了烘焙生物质与煤粉二元混合物的流动及下料特性试验,重点探讨了烘焙生物质质量分数对烘焙生物质与煤粉二元混合物流动特性的影响规律,并对不同烘焙生物质与煤粉混合物流动特性的差异进行了比较;进而考察了烘焙生物质质量分数(0~100%)和下料口直径(15、17、21、24和27 mm)对烘焙生物质与煤粉二元混合物下料特性的影响规律,并提出了预测烘焙生物质与煤粉二元混合颗粒系统下料质量流率的经验公式。结果表明:随着烘焙生物质质量分数的增加,混合物的休止角和压缩度逐渐增大,Carr流动性指数(FI)逐渐减小,混合物的流动特性逐渐变差。与休止角法和压缩度法相比,采用Carr流动性指数法对于烘焙生物质与煤粉二元混合物流动特性的评价更加细致全面。该文所研究的4种原料的FI从大至小依次为:无烟煤1>无烟煤2>烘焙生物质1>烘焙生物质2。对于4种不同烘焙生物质/煤粉混合物,其流动特性由一般(common)过渡至较差(poor)的转折点(即FI=60)所对应的烘焙生物质质量分数从小到大依次为:无烟煤2(平均粒径为120 μm) /烘焙生物质2(平均粒径为115 μm)(34%)<无烟煤1(平均粒径为250 μm) /烘焙生物质2(52%)<无烟煤2/烘焙生物质1(平均粒径为230 μm)(70%)<无烟煤1/烘焙生物质1(85%)。随着烘焙生物质质量分数的增加,不同烘焙生物质与煤粉混合物的下料质量流率均逐渐减小。混合物的下料过程是否能够正常进行主要取决于混合物中烘焙生物质的添加量,即烘焙生物质的质量分数,其下料极限生物质添加量可以通过测定烘焙生物质/煤粉混合物的FI进行预测。当烘焙生物质的添加量使得烘焙生物质/煤粉混合物的FI<55时,即流动特性处于较差(poor)且接近非常差(bad)的区域,甚至进入非常差(bad)范畴时,混合物的下料过程将无法进行。随着下料口直径的增大,不同配比的烘焙生物质与煤粉混合物的下料质量流率均逐渐增大。该文所获得的不同配比烘焙生物质与煤粉混合物下料质量流率经验公式可以在?15%到+25%的误差范围内对烘焙生物质与煤粉二元混合物的下料质量流率进行较好地预测。
Xu Guiling,Li Menghui,Lu Ping,Song Hengheng,Liang Cai,Chen Xiaoping.Flowability and discharge characteristics of mixtures with different ratio of torrefied biomass and pulverized coal[J].Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE),2018,34(1):186-192.DOI:10.11975/j.issn.1002-6819.2018.01.025
Flowability and discharge characteristics of mixtures with different ratio of torrefied biomass and pulverized coal
Author NameAffiliation
Xu Guiling 1. Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, China
 
Li Menghui 1. Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, China
 
Lu Ping 1. Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, China
 
Song Hengheng 1. Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, China
 
Liang Cai 2. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China
 
Chen Xiaoping 2. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China
 
Key words:biomass  pyrolysis  coal  binary particle mixture  flowability  discharge characteristics
Abstract: Co-gasification of coal with biomass has been considered as a new research focus of clean coal technology, as well as a novel utilization technology of biomass energy. However, the processes of biomass collection, storage and transportation are difficult and costly. It is necessary to pretreat the raw biomass properly. Recently, torrefaction is a promising technique for biomass pretreatment. Substituting raw biomass with torrefied biomass to blend with pulverized coal can improve the flowability and discharge characteristics of gasification feedstocks, which may affect not only the composition of the synthesis gas, but also the long-period, continuous and stable operation of the gasifer. Compared with pulverized coal, torrefied biomass particles are different in shape, density and material properties, and the flowability and discharge characteristics of binary particle mixtures (BPMs) of torrefied biomass and pulverized coal have certain particularity, which needs further experimental investigation. In this paper, the experiments of flowability and discharge characteristics for the BPMs of torrefied biomass and pulverized coal were carried out with a BT-1000 powder comprehensive characteristics analyzer and a Plexiglas hopper discharge experimental system, respectively. The effect of torrefied biomass mass fraction on the flowability of the BPMs was investigated, and the differences between different mixtures of torrefied biomass and pulverized coal were compared. Meanwhile, the effects of torrefied biomass mass fraction and discharge outlet diameter of the hopper on the discharge characteristics of the BPMs were studied. An empirical formula for predicting discharge mass flow rate of the BPMs was proposed. The results show that as torrefied biomass mass fraction increases, the angle of repose and compression degree of the mixtures increase, while the Carr flowability index (FI) decreases, and the flowability of the mixtures becomes worse. Compared to the methods of angle of repose and compression degree, the FI method can be used to evaluate the flowability of the BPMs more detailedly and comprehensively. The sequence of the FI of the 4 kinds of raw material is as follows: Anthracite 1 > anthracite 2 > torrefied biomass 1 > torrefied biomass 2. The torrefied biomass mass fraction of the BMPs corresponding to the flowability turning point from the common flowability region to the poor flowability region (FI=60), is as follows: Anthracite 2 / torrefied biomass 2 (34%) < anthracite 1 / torrefied biomass 2 (52%) < anthracite 2 / torrefied biomass 1 (70%) < anthracite 1 / torrefied biomass 1 (85%). As torrefied biomass mass fraction increases, the discharge mass flow rates of different BMPs all decrease. The successful discharge of the BPMs mainly depends on the amount of torrefied biomass. The extreme amount of torrefied biomass for discharge process can be predicted and determined by measuring the FI of the BPMs. When the FI of the BPMs is less than 55, the flowability of the BPMs is in the lower region of poor flowability, which is close to the region of bad flowability or even in the region of bad flowability, and the BMPs cannot be discharged successfully. As the discharge outlet diameter increases, the discharge mass flow rates of different mixtures increase. The empirical formula obtained in this paper can predict the discharge mass flow rate of the BPMs of torrefied biomass and pulverized coal well with errors ranging from -15% to 25%.
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