-
摘要: 基于准东煤中Na/Ca的赋存形态,采用管式加热炉研究了准东煤中Na/Ca在惰性气氛下的释放特性和形态转变。结果表明,水溶态Naw在加热温度t ≤ 600℃时先转变成不可溶态Nare,随着温度升高,不可溶态Nare又重新转变成水溶态Naw,当加热温度t > 800℃时,Na大量释放。酸溶态Caac在加热温度t ≤ 700℃时先分解生成CaO并且与其他矿物组分反应转变成不可溶态Care,随着温度升高,不可溶态Care逐渐转变成酸溶态Caac和水溶态Caw。相同温度条件下,Ca的释放率低于Na的释放率,少量酸溶态有机Ca随挥发分释放而以气相形式释放。Abstract: The release and transformation characteristics of Na/Ca in Zhundong coal under inert atmosphere were studied by using tubular heating furnace based on occurrence modes of Na/Ca containing species. It is found that water soluble Naw firstly transfers to insoluble Nare when the heating temperature is lower than 600℃. As the temperature increases, insoluble Nare transfers back to water soluble Naw. Large amount of Na releases when the temperature is higher than 800℃. Acid soluble Caac firstly decomposes to CaO when the heating temperature is lower than 700℃, and CaO reacts with other minerals to form insoluble Care. As the temperature increases, insoluble Care transfers to acid soluble Caac and water soluble Caw. At the same temperature, the release rate of Ca is lower than that of Na. Moreover, a little amount of acid soluble organic Ca will release when the volatile matter releases.
-
Key words:
- Zhundong coal /
- Na/Ca /
- release characteristics /
- transformation
-
表 1 样品的工业分析和元素分析
Table 1 Ultimate and proximate analyses of tested coals
Coal Proximate analysis wad/% Ultimate analysis wad/% M A V FC C H N S O Cl ZD-1 18.61 4.12 28.03 49.23 66.14 3.53 1.00 0.08 5.77 0.75 ZD-2 13.24 6.10 24.92 55.74 67.63 3.48 0.84 0.44 8.18 0.09 note: determination of chloride is referred to GB/T 3558—2014 Determination of chlorine in coal -
[1] ZHOU J, ZHUANG X, ALASTUEY A, QUEROL X, LI J. Geochemistry and mineralogy of coal in the recently explored Zhundong large coal field in the Junggar basin, Xinjiang province, China[J]. Int J Coal Geol, 2010, 82(1/2):51-67. https://www.sciencedirect.com/science/article/pii/S0166516209002304 [2] 杨忠灿, 刘家利, 姚伟.准东煤灰沾污指标研究[J].洁净煤技术, 2013, 19(2):81-84. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=jjmjs201302022YANG Zhong-can, LIU Jia-li, YAO Wei. Fouling index of Zhundong coal ash[J]. Clean Coal Technol, 2013, 19(2):81-84. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=jjmjs201302022 [3] 王礼鹏, 赵永椿, 张军营, 姚斌, 郑楚光.准东煤沾污结渣特性研究[J].工程热物理学报, 2015, (6):1381-1385. http://www.cnki.com.cn/Article/CJFDTOTAL-RLFD201008013.htmWANG Li-peng, ZHAO Yong-chun, ZHANG Jun-ying, YAO Bin, ZHENG Chu-guang. Research on the slagging and fouling characteristics of Zhundong coal[J]. J Eng Therm, 2015, (6):1381-1385. http://www.cnki.com.cn/Article/CJFDTOTAL-RLFD201008013.htm [4] 刘家利.准东煤灰熔融性与灰成分相关性分析[J].洁净煤技术, 2015, 21(5):99-102. http://www.cnki.com.cn/Article/CJFDTotal-JJMS201505024.htmLIU Jia-li. Correlation analysis of ash fusibility and ash composition of Zhundong coal[J]. Clean Coal Technol, 2015, 21(5):99-102. http://www.cnki.com.cn/Article/CJFDTotal-JJMS201505024.htm [5] 樊斌, 于敦喜, 曾宪鹏, 吕为智, 吴建群, 徐明厚.准东煤燃烧中矿物质转化行为的CCSEM研究[J].化工学报, 2016, 67(5):2117-2123. http://www.cnki.com.cn/Article/CJFDTotal-HGSZ201605062.htmFAN Bin, YU Dun-xi, ZENG Xian-peng, LÜ Wei-zhi, WU Jian-qun, XU Ming-hou. Mineral transformation during Zhundong coal combustion by CCSEM[J]. J Chem Ind Eng (China), 2016, 67(5):2117-2123. http://www.cnki.com.cn/Article/CJFDTotal-HGSZ201605062.htm [6] MANZOORI A R, AGARWAL P K. The fate of organically bound inorganic elements and sodium chloride during fluidized bed combustion of high sodium, high sulphur low rank coals[J]. Fuel, 1992, 71(5):513-522. doi: 10.1016/0016-2361(92)90148-H [7] WANG C A, JIN X, WANG Y, YAN Y, CHU I, LIU Y, CHE D. Release and transformation of sodium during pyrolysis of Zhundong coals[J]. Energy Fuels, 2015, 29(1):78-85. doi: 10.1021/ef502128s [8] 王智化, 李谦, 刘敬, 黄镇宇, 周志军, 周俊虎, 岑可法.准东煤中碱金属的赋存形态及其在热解过程中的迁移规律[J].中国电机工程学报, 2014, 34(s1):130-135. http://www.cnki.com.cn/Article/CJFDTotal-ZGDC2014S1018.htmWANG Zhi-hua, LI Qian, LIU Jing, Huang Zhen-yu, ZHOU Zhi-jun, ZHOU Jun-hu, CEN Ke-fa. Occurrence of alkaili metals in Zhundong coal and its migration during pyrolysis[J]. Proc CSEE, 2014, 34(s1):130-135. http://www.cnki.com.cn/Article/CJFDTotal-ZGDC2014S1018.htm [9] 姚宇翔, 金晶, 钟程鹏, 王永贞, 高姗姗, 赵庆庆.准东煤中钠的赋存形态及挥发特性[J].煤炭转化, 2016, 39(1):1-5. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=mtzh201601001YAO Yu-xiang, JIN Jing, ZHONG Cheng-peng, WANG Yong-zhen, GAO Shan-shan, ZHAO Qing-qing. Occurrence mode and volatilization characteristic of sodium in Zhundong coal[J]. Coal Convers, 2016, 39(1):1-5. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=mtzh201601001 [10] YANG Y, WU Y, ZHANG H, ZHANG M, LIU Q, YANG H, LU J. Improved sequential extraction method for determination of alkali and alkaline earth metals in Zhundong coals[J]. Fuel, 2016, 181:951-957. doi: 10.1016/j.fuel.2016.05.014 [11] QUYN D M, WU H, LI C Z. Volatilisation and catalytic effects of alkali and alkaline earth metallic species during the pyrolysis and gasification of Victorian brown coal. Part Ⅰ. Volatilisation of Na and Cl from a set of NaCl-loaded samples[J]. Fuel, 2002, 81(2):143-149. doi: 10.1016/S0016-2361(01)00127-2 [12] TAKARADA T, ISHIKAWA H, ABE H, NAKAIKE Y. Alkali volatilisation during pyrolysis and gasification of coal[J]. Coal Sci Technol, 1994, 24:687-690. https://www.sciencedirect.com/science/article/pii/S0016236106000202 [13] LI C Z, SATHE C, KERSHAW J R, PANG Y. Fates and roles of alkali and alkaline earth metals during the pyrolysis of a victorian brown coal[J]. Fuel, 2000, 79(3):427-438. https://www.sciencedirect.com/science/article/pii/S0016236199001787