| 基于拟三元等温图对宁东粉煤灰高温熔融流动特性的研究 |
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| 引用本文： | 阚浩勇,李平,陈财,牛艳青. 基于拟三元等温图对宁东粉煤灰高温熔融流动特性的研究[J]. 石油学报(石油加工), 2023, 39(1): 134-141. DOI: 10.3969/j.issn.1001-8719.2023.01.014 |
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| 作者姓名： | 阚浩勇 李平 陈财 牛艳青 |
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| 作者单位： | 1. 宁夏大学 化学化工学院 省部共建煤炭高效利用与绿色化工国家重点实验室，宁夏 银川 750021； 2. 西安交通大学 能源与动力工程学院 动力工程多相流国家重点实验室, 陕西 西安 710049 |
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| 基金项目： | 国家自然科学基金区域创新联合基金项目（U21A20319）、宁夏自然科学基金项目（2022AAC03110）资助 |
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| 摘 要： | 在气流床气化炉的实际运行中，经常需要寻求最优的进料煤调配方案以调控煤灰的熔融流动特性。借助SiO2-Al2O3-AAEM(CaO+MgO+Na2O+K2O)拟三元等温图，分析了不同组成的宁东煤灰熔融特性，并结合X-射线衍射(XRD)探究了灰在熔化过程中的矿物质转化规律。发现熔融温度在拟三元等温图中呈现U型分布。当SiO2、Al2O3和AAEM质量分数分别为37.5%、25.0%和37.5%时，灰的熔融温度达到最低，流动温度比宁东煤灰降低40 ℃。对灰熔化过程中矿物质转化分析发现，熔化过程中石英与氧化钙会发生矿物质转化反应生成低熔点的钙黄长石和长石，对其熔化具有明显的促进作用；对灰熔化后形成液态熔渣的黏-温特性曲线分析发现，该比例下灰样品同时具有最低的临界黏性温度(TCV=1107 ℃)和最低的黏性流动活化能(Ea=282.86 kJ/mol)，可有效降低气化炉的操作温度。研究表明，拟三元等温图对于气化原料配煤方案可起到一定的指导作用。
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| 关 键 词： | 宁东煤灰 熔融特性 流动特性 矿物质 拟三元等温图 |
| 收稿时间： | 2021-11-08 |
Study on Melting and Flowing Characteristics of Ningdong Coal Ash at High Temperatures Based on Pseudo-ternary Isotherm Diagrams |
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| KAN Haoyong,LI Ping,CHEN Cai,NIU Yanqing. Study on Melting and Flowing Characteristics of Ningdong Coal Ash at High Temperatures Based on Pseudo-ternary Isotherm Diagrams[J]. Acta Petrolei Sinica (Petroleum Processing Section), 2023, 39(1): 134-141. DOI: 10.3969/j.issn.1001-8719.2023.01.014 |
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| Authors: | KAN Haoyong LI Ping CHEN Cai NIU Yanqing |
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| Affiliation: | 1. State Key Laboratory of Coal Efficient Utilization and Green Chemical Engineering, School of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China;2. State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China |
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| Abstract: | In the operation of the entrained-flow gasifier, it is necessary to seek the optimal coal blending plan to regulate the melting and flow characteristics of coal ash. The SiO2-Al2O3-AAEM(CaO+MgO+Na2O+K2O) pseudo-ternary isotherm was used to analyze the melting characteristics of Ningdong coal ash with different compositions, and combined with X-ray diffraction (XRD) to explore the mineral transformation law of ash in the melting process. It is found that the melting temperature presents a U-shaped distribution in the pseudo-ternary isotherm; when the mass fractions of SiO2, Al2O3 and AAEM are 37.5%,25.0%and 37.5%, respectively, the melting temperature of coal ash is the lowest, and the flowing temperature is 40 ℃ lower than that of Ningdong coal ash. The analysis of mineral transformation during ash melting indicates that the mineral transformation reaction between quartz and calcium oxide in the process of melting can finally produce feldspar and gehlenite with low melting point, significantly promoting ash melting. The analysis of the viscosity-temperature characteristic curves of liquid molten slags generated after ash melting indicates that ash samples at this ratio has the lowest critical viscosity-temperature (TCV=1107 ℃) and the lowest activation energy of viscous flow (Ea=282.86 kJ/mol), which can effectively reduce the operating temperature of gasifiers. The study shows that the pseudo-ternary isotherm can guide the preparation of coal blending plans for feedstock gasification. |
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| Keywords: | Ningdong coal ash melting characteristic flowing characteristic mineral pseudo-ternary diagram |
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