Research on Influence Factors of Cement on the Melting Characteristics of High Melting Point Coal Ash
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摘要:
煤炭作为我国主要的能源，在国民经济的发展中起着重要作用，为便于工业化操作，降低高灰熔点煤的温度是非常必要的。选择了熔点较低的胶泥，按一定的配比加入三种高熔点煤（大同煤、准东煤和长平煤）中，探究胶泥对高灰熔点煤灰熔融特性的影响。结果表明，胶泥可以降低三种高熔点煤的灰熔点，但三种煤灰熔融温度降低程度与胶泥的含量不呈线性关系。胶泥对三种煤灰熔融温度降低的效果呈现：大同>准东>长平；胶泥降低灰熔点主要因为胶泥中的碱性氧化物含量高，酸性氧化物含量低，易与氧结合，相反碱性离子的离子势低，降低多聚物的聚集，从而降低了灰熔点。
Abstract:As the main energy source in our country, coal plays an important role in the development of the national economy. In order to facilitate industrial operation, it is necessary to reduce the temperature of coal with high ash melting point. The cement with a lower melting point was selected, and three high-melting coals (Datong, Zhundong, and Changping) were added according to a certain ratio to explore the effect of the cement on the ash melting characteristics of the high-ash-melting coal. The results show that the mortar can reduce the ash melting point of the three high-melting coals, but the degree of reduction in the melting temperature of the three coal ash is not linearly related to the content of the mortar. The effect of mortar on reducing the melting temperature of three kinds of coal ash is presented: Datong> Zhundong> Changping; the lower ash melting point of mortar is mainly due to the high content of alkaline oxides in the mortar and low content of acidic oxides, which are easy to combine with oxygen. On the contrary, alkali The ion potential of the sex ions is low, which reduces the aggregation of polymers, thereby lowering the ash melting point.
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Key words:
- Ash melting characteristics /
- Cement /
- Influence
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表 1 原煤的工业分析/%
Table 1. Industrial analysis of raw coal
样品 Mad Aad Vad FCad CP 2.47 15.75 6.10 75.37 DT 0.47 8.07 24.49 69.01 ZD 0.32 9.82 21.99 66.47 
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表 2 胶泥与原煤灰熔融温度/℃
Table 2. Melting temperature of cement and raw coal ash
样品 DT ST HT FT CP >1500 >1500 >1500 >1500 DT 1410 >1410 >1410 >1410 ZD 1430 >1430 >1430 >1430 胶泥 1123 1130 1144 1221
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表 3 胶泥与原煤灰的化学组成分析/%
Table 3. Chemical composition analysis of cement and raw coal ash
样品 SiO2 Al2O3 TiO2 SO3 Fe2O3 CaO MgO K2O Na2O P2O5 酸碱比 硅铝比 硅比 CP 49.48 33.45 1.17 2.57 4.78 3.36 0.97 1.12 1.10 0.42 7.34 1.78 84.14 DT 47.24 31.78 1.34 2.07 4.47 4.14 1.02 1.10 1.01 0.43 6.49 1.49 83.14 ZD 41.49 34.39 1.68 5.47 4.89 5.22 1.54 0.47 1.85 0.59 6.49 1.73 77.81 胶泥 45.49 15.75 0.84 0.12 6.79 9.45 2.66 2.07 0.99 0.37 2.48 2.89 70.46
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表 4 胶泥与CP主要酸碱氧化物的总含量/%
Table 4. Total content of main acid-base oxides of cement and CP
样品 A B 胶泥 19.17 60.43 CP 9.44 82.85 B= Al2O3、SiO2、MgO； A= Fe2O3、CaO
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表 5 胶泥与原煤灰的主要酸碱氧化物的总含量/%
Table 5. Total content of main acid-base oxides of cement and raw coal ash
样品 A B 胶泥 19.41 60.28 ZD 9.48 77.78 A=Al2O3、SiO2 ；B= Fe2O3、CaO、MgO
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[1] 于志浩, 金晶, 张瑞璞, 等. 白云石添加剂对稻秆灰熔融特性及固钾能力的影响[J]. 燃料化学学报, 2020(7):795-803. doi: 10.3969/j.issn.0253-2409.2020.07.004
YU Z H, JIN J, ZHANG R P, et al. Effect of dolomite additives on the melting characteristics of rice straw ash and potassium fixation[J]. Journal of Fuel Chemistry and Technology, 2020(7):795-803. doi: 10.3969/j.issn.0253-2409.2020.07.004
[2] Liang W, Wang G W, Ning X J, et al. Effect of CaO mineral change on coal ash melting characteristics[J]. Journal of the Energy Institute, 2020, 93(2):642-648. doi: 10.1016/j.joei.2019.06.001
[3] 王芳杰, 唐玉林, 夏国富, 等. 配煤煤灰熔融特性模拟研究[J]. 洁净煤技术, 2019, 25(4):59-64.
WANG F J, TANG Y L, XIA G F, et al. Simulation study on ash fusion characteristics of coal blending[J]. Clean Coal Technology, 2019, 25(4):59-64.
[4] 陆宏权, 李寒旭, 马飞, 等. 钙基助熔剂对煤灰熔融性影响及熔融机理研究[J]. 煤炭科学技术, 2011, 39(2):111-114.
LU H Q, LI H X, MA F, et al. Influence of calcium-based flux on coal ash melting and melting mechanism[J]. Coal Scienceand and Technology, 2011, 39(2):111-114.
[5] James C, David R, James M Roberts. Petrology and minor element chemistry of combustion by-products from the co-combustion of coal, tire-derived fuel, and petroleum coke at a western Kentucky cyclone-fired unit[J]. Fuel Processing Technology, 2001, 74(2): 74-85.
[6] Fan C, Guo S M, Jin H. Study on coal gasification in supercritical water fluidized bed and exploration of complete gasification under mild temperature condition[J]. Chemical Engineering Science, 2019, 21(3):78-83.
[7] 赵瑞, 李寒旭, 钱宁波, 等. 铁钙比对煤灰熔融特性的影响[J]. 应用化工, 2015, 44(1):4-7.
ZHAO R, LI H X, QIAN N B, et al. Effect of iron to calcium ratio on the fusion characteristics of coal ash[J]. Applied Chemical Industry, 2015, 44(1):4-7.
[8] 张文玲. 烧结法赤泥对晋城无烟煤灰熔融特性的影响[J]. 矿产综合利用, 2018(6):111-115. doi: 10.3969/j.issn.1000-6532.2018.06.023
ZHANG W L. Effect of sintering red mud on the ash melting characteristics of Jincheng anthracite[J]. Multipurpose Utilization of Mineral Resources, 2018(6):111-115. doi: 10.3969/j.issn.1000-6532.2018.06.023
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