| 中国西南石漠化地区农村能源消费结构研究 |
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| 引用本文： | 郭应军,熊康宁,安裕伦,盈斌,王琦.中国西南石漠化地区农村能源消费结构研究[J].农业工程学报,2019,35(3):226-234. |
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| 作者姓名： | 郭应军 熊康宁 安裕伦 盈斌 王琦 |
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| 作者单位： | 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,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,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 |
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| 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） |
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| 摘 要： | 为考察烘焙林业废弃物生物质与煤粉二元混合物的流化特性,在自行搭建的流化试验装置上,进行不同质量配比的烘焙生物质与煤粉二元混合颗粒系统的流化试验,获得该系统的流化特性曲线,并在此基础上确定二元混合颗粒的起始流化速度、最小流化速度和完全流化速度等特征速度,进而获得"组分-特征速度"的相平衡图,探讨烘焙生物质质量分数(0,20%,40%,60%,80%和100%)对二元混合颗粒流化特性的影响规律,并提出了预测烘焙生物质与煤粉二元混合颗粒最小流化速度的经验公式。结果表明,煤粉颗粒与烘焙生物质颗粒单独流化时,流化曲线可以划分为4个区域:I固定床区域,II过渡区域,III起始流化区域和IV完全流化区域。完全流化区域标准化床层比压降值的大小依次为:无烟煤1(0.90)无烟煤2(0.86)烘焙生物质1(0.84)烘焙生物质2(0.53),流化质量依次变差。烘焙生物质与煤粉二元混合颗粒的流化曲线与其单组分颗粒的流化曲线近似,但区域II和III所对应的气速的范围明显缩小。随着烘焙生物质质量分数的增加,完全流化区域的标准化床层比压降值呈现出逐渐减小的趋势,混合颗粒的流化质量逐渐变差,起始流化速度先增大后减小,完全流化速度先减小后增大,最小流化速度逐渐减小。不同特征速度对应着不同流化阶段间的过渡,通过流化气速所处的区间并结合"组分-特征速度"相平衡图,可以对二元混合颗粒所处的流化状态进行预判,并可根据实际工程应用需要对操作流化气速进行相应的调节。该文所获得的不同配比烘焙生物质与煤粉二元混合颗粒最小流化速度经验公式可以在–25%～+20%的误差范围内对烘焙生物质与煤粉二元混合颗粒的最小流化速度进行较好地预测。研究结果可为生物质与煤流化床共气化工艺中的气化炉等相关工艺设备的设计和安全稳定运行提供参考。
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| 关 键 词： | 生物质 煤 速度 二元混合颗粒 流化特性 |
| 收稿时间： | 2018/7/20 0:00:00 |
| 修稿时间： | 2018/12/26 0:00:00 |
Fluidization characteristics of torrefied forest waste biomass and pulverized coal mixture particles with different mixing ratios |
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| Guo Yingjun,Xiong Kangning,An Yulun,Ying Bin and Wang Qi.Fluidization characteristics of torrefied forest waste biomass and pulverized coal mixture particles with different mixing ratios[J].Transactions of the Chinese Society of Agricultural Engineering,2019,35(3):226-234. |
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| Authors: | Guo Yingjun Xiong Kangning An Yulun Ying Bin and Wang Qi |
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| Institution: | Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, China,Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, China and Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, China |
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| Abstract: | Abstract: The rural household energy plays an important role in national energy consumption. The rural energy consumption has an important impact on social and economic development, ecological security and residents'' physical health. The survey was conducted based on 429 households in 25 administrative villages, 8 townships (towns), 4 counties, in Karst rocky desertification control demonstration area of Guizhou province. The correlation between rural energy consumption and a scale of karst rocky desertification in southwest China was investigated. The results show that: 1) Firewood and coal are still main energy consumption structure in study area. Due to the overall low level of economic income, farmers have to continue to use traditional firewood, resulting in the formation of firewood + commodity energy consumption model, namely, firewood + coal, firewood + electricity, firewood + petroleum, petrochemical, and other energy modes, and showing a pattern of multi-energy complementarity. 2) The rural energy using tends to be clean and efficient, but the energy consumption transformation is a slow process. Due to the influence of demographic characteristics and traditional culture, the electricity is still not the main energy in the study area. Meanwhile the influence of migrant workers, the rural population is dominated by the elderly, women and children, and "hollow villages" appears in study areas, which complicates the rural energy consumption. 3) Regional differences in energy consumption model are significant. Bijie-salaxi demonstration area have formed model of "firewood + coal" for life energy, "coal" for heating and "firewood" for production energy (cooking pig food). Guanling-huajiang demonstration area and Zhenfeng-beipanjiang have formed model of "firewood + electricity" for life energy and "electricity" for heating. In Shibing Karst demonstration area have formed model of "firewood + electricity" for life energy, "firewood + coal" for heating and "coal" for production. 4) The firewood consumption in potential rocky desertification areas is the highest, but it is within the reasonable ecological threshold and there is no risk of rocky desertification. Its firewood consumption is related to higher biomass, population characteristics, heating, resource availability, lower population density and tourism development. Although the consumption of firewood is the lowest in slight rocky desertification, it has exceeded the reasonable ecological threshold and is at the risk of aggravation and expansion of rocky desertification. Its firewood consumption is related to the abundant coal and living habits. The firewood consumption is lower in moderate-intensity karst rocky desertification, but it has exceeded the reasonable ecological threshold and is at the risk of aggravation and expansion of rocky desertification. The firewood consumption is related to the lower forest coverage, biomass and stand biomass, low income level, historical factors and loss of opportunity cost. 5) The rural energy poverty in karst rocky desertification areas is serious. The economic unaffordability is mainly found in Bijie-salaxi and Zhenfeng-beipanjiang. Indoor environmental pollution was serious in four study areas, especially in Bijie-salaxi and shibing Karst. 6) This study reveals differences in energy consumption level and structure of rural households in karst rocky desertification areas in southwest China. Through comparative analysis, it is found that energy consumption of rural households is mainly subject to the comprehensive influence of the income level of farmers, the availability of energy and resources, heating, traditional culture, industrial structure, policies and other factors. This study provides theoretical basis for understanding the current situation and development trend of household energy consumption in rural region of southwest China and formulating relevant policies of energy and environmental. |
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| Keywords: | biomass coal velocity binary particle mixture fluidization characteristic |
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