煤中碱(土)金属形态在煤转化过程中的作用及不同形态间转化的研究进展

doi:10.16085/j.issn.1000-6613.2017-2504

摘要/Abstract

摘要： 煤中的碱（土）金属（alkali/alkaline earth metals，AAEM）既可导致设备结渣、腐蚀，对燃烧、气化等反应也有显著的催化作用。识别煤中AAEM的形态，揭示其在煤转化过程中的作用与产生机制，明晰不同形态间的迁移转化规律，是减缓或消除设备玷污、腐蚀，强化催化作用的前提和基础。论文对煤中AAEM赋存形态和分离方法、造成设备积灰腐蚀的机制以及对煤炭燃烧、气化等催化机理的研究做了较为系统的综述性评介，着重探讨AAEM不同形态间相互转化的可能性。结果表明，借助逐级萃取法可将煤中AAEM划分成水溶型、离子交换型、酸溶型和不溶型4种形态，但现有方法存在缺陷，可通过筛选萃取溶剂和规范操作流程进行完善，达到准确分离的目的；AAEM是造成设备玷污、腐蚀，还是催化燃烧、气化，取决于AAEM的物种，对AAEM所起作用与其形态间的关系尚不清晰，需通过研究进一步验证；采用水洗、酸洗、添加剂、混配煤等方法来缓解或消除AAEM有害影响具有局限性，基于不同形态的AAEM可以相互转化，促使有害形态的AAEM向有益形态转化，可为高碱低阶煤洁净高效利用提供新的思路。

关键词: 高碱煤, 碱(土)金属, 形态, 作用, 迁移转化

Abstract: Alkali/alkaline earth metals(AAEM) in coal can cause slagging and corrosion in a boiler or gasifier, while their catalytic effect has been confirmed for combustion and gasification. Thus, identifying the occurrence modes of AAEM in coal, revealing their roles in coal conversion processes and exploring the probability of transformation among different occurrence modes of AAEM are of great significance in investigation of approaches to alleviating or eliminating the slagging and corrosion of the apparatus and to strengthening their catalytic effects. In this paper, a critical literature survey was presented in the following aspects, including the occurrence modes and separation methods of AAEM in coal, and the mechanisms of apparatus corrosion caused by AAEM as well as catalytic mechanism for coal combustion and gasification, in which more attentions were paid on the possibility of transformation of AAEM in different occurrence modes. The results showed that ① AAEM in coal could be divided into water-soluble, ion-exchangeable, acid-soluble and insoluble by the sequential extraction method, but there were some shortages in the existing methods, which can be improved by screening extraction agent and standardizing operation process to achieve the purpose of accurate separation;② the roles of AAEM in coal conversion processes depended on their occurrence modes in coal, however, the relationship between the roles and occurrence modes of AAEM is not clear. A detailed study and further verification will be needed; ③ there were limitations to alleviate or eliminate the harmful effects of AAEM by some technical measures such as washing, acid washing, additives and blending coals; and ④ AAEM in different occurrence modes in coal could be transformed from each other. If the harmful forms of AAEM can be transformed into beneficial forms, it may lay the foundation for the development of an innovative technology for the clean and efficient utilization of high alkali coal.

Key words: high alkali coal, alkali/alkaline earth metals, occurrence, role, transformation

中图分类号:

TQ53

梁鼎成, 解强. 煤中碱(土)金属形态在煤转化过程中的作用及不同形态间转化的研究进展[J]. 化工进展, 2018, 37(07): 2577-2587.

LIANG Dingcheng, XIE Qiang. Occurrence, roles in coal conversion processes, and transformation of alkali/alkaline earth metals in coal: a review[J]. Chemical Industry and Engineering Progress, 2018, 37(07): 2577-2587.

参考文献

[1] 张守玉,陈川,施大钟,等. 高钠煤燃烧利用现状[J]. 中国电机工程学报, 2013(5):1-12. ZHANG S Y, CHEN C, SHI D Z, et al. Situation of combustion utilization of high sodium coal[J]. Proceedings of the CSEE, 2013(5):1-12.
[2] LI C. Some recent advances in the understanding of the pyrolysis and gasification behaviour of Victorian brown coal[J]. Fuel, 2007, 86(12/13):1664-1683.
[3] 付子文,王长安,翁青松,等. 水洗对准东煤煤质特性影响的实验研究[J]. 西安交通大学学报, 2014, 48(3):54-60. FU Z W, WANG C A, WENG Q S, et al. Experimental investigation for effect of water washing on Zhundong coal properties[J]. Journal of Xi'an Jiaotong University, 2014, 48(3):54-60.
[4] 张文达,王鹏翔,孙绍增,等. 酸洗脱灰对准东次烟煤结构和反应活性的影响[J]. 化工学报, 2017,68(8):3291-3300. ZHANG W D, WANG P X, SUN S Z, et al. Effects of demineralization methods on the structure and reactivity of Zhundong subbituminous coal[J]. CIESC J, 2017,68(8):3291-3300.
[5] KRERKKAIWAN S, FUSHIMI C, YAMAMOTO H, et al. Influences of heating rate during coal char preparation and AAEMs on volatile-char interaction with different sources of biomass volatile[J]. Fuel Processing Technology, 2014, 119:10-18.
[6] RIZKIANA J, GUAN G, WIDAYATNO W B, et al. Effect of biomass type on the performance of cogasification of low rank coal with biomass at relatively low temperatures[J]. Fuel, 2014, 134:414-419.
[7] RIZKIANA J, GUAN G, WIDAYATNO W B, et al. Promoting effect of various biomass ashes on the steam gasification of low-rank coal[J]. Applied Energy, 2014, 133:282-288.
[8] ZHU C, QU S, ZHANG J, et al. Distribution, occurrence and leaching dynamic behavior of sodium in Zhundong coal[J]. Fuel, 2017, 190:189-197.
[9] 宋维健,宋国良,张海霞,等. 准东高钠煤热解过程中钠的迁移特性实验研究[J]. 燃料化学学报, 2015(1):16-21. SONG W J, SONG G L, ZHANG H X, et al. Experimental study on alkali metal transformation during high-sodium Zhundong coal pyrolysis[J]. Journal of Fuel Chemistry and Technology, 2015(1):16-21.
[10] VAN EYK P J, ASHMAN P J, ALWAHABI Z T, et al. The release of water-bound and organic sodium from Loy Yang coal during the combustion of single particles in a flat flame[J]. Combustion and Flame, 2011, 158(6):1181-1192.
[11] LIU S, QIAO Y, LU Z, et al. Release and transformation of sodium in kitchen waste during torrefaction[J]. Energy & Fuels,2014,28(3):1911-1917.
[12] SONG G, QI X, SONG W, et al. Slagging behaviors of high alkali Zhundong coal during circulating fluidized bed gasification[J]. Fuel, 2016, 186:140-149.
[13] WANG X, XU Z, WEI B, et al. The ash deposition mechanism in boilers burning Zhundong coal with high contents of sodium and calcium:a study from ash evaporating to condensing[J]. Applied Thermal Engineering, 2015, 80:150-159.
[14] 赵洪宇,任善普,贾晋炜,等. 钙、镍离子3种不同负载方式对褐煤热解-气化特性影响[J]. 煤炭学报, 2015(7):1660-1669. ZHAO H Y, REN S P, JIA J W, et al. Effects of calcium and nickel ions by three different load methods on pyrolysis and gasification characteristics of lignite[J]. Journal of China Coal Society, 2015(7):1660-1669.
[15] DING L, ZHOU Z, GUO Q, et al. Catalytic effects of Na₂CO₃ additive on coal pyrolysis and gasification[J]. Fuel, 2015, 142:134-144.
[16] 白向飞,王越,丁华,等. 准东煤中钠的赋存状态[J]. 煤炭学报, 2015, 40(12):2909-2915. BAI X F, WANG Y, DING H, et al. Modes of occurrence of sodium in Zhundong coal[J]. Journal of China Coal Society, 2015, 40(12):2909-2915.
[17] 翁青松,王长安,车得福,等. 准东煤碱金属赋存形态及对燃烧特性的影响[J]. 燃烧科学与技术, 2014, 20(3):216-221. WENG Q S, WANG C A, CHE D F, et al. Alkali metal occurrence mode and its influence on combustion characteristics in Zhundong coals[J]. Journal of Combustion Science and Technology, 2014, 20(3):216-221.
[18] SONG W, SONG G, QI X, et al. Speciation and distribution of sodium during zhundong coal gasification in a circulating fluidized bed[J]. Energy & Fuels, 2017, 31(2):1889-1895.
[19] 齐晓宾,宋国良,宋维健. 准东高碱煤气化过程中碱金属赋存形态迁移转化[J]. 煤炭学报, 2016, 41(4):1011-1017. QI X B, SONG G L, SONG W J. Transformation and migration of alkali metal with different occurrences of Zhundong high-alkali coal during gasification[J]. Journal of China Coal Society, 2016, 41(4):1011-1017.
[20] 宋维健,宋国良,齐晓宾,等. 不同预处理方法对准东高碱煤中碱金属含量测定的影响[J]. 燃料化学学报, 2016, 44(2):162-167. SONG W J, SONG G L, QI X B, et al. Effect of pretreatment methods on the determination of alkali metal content in high alkali metal Zhundong coal[J]. Journal of Fuel Chemistry and Technology, 2016, 44(2):162-167.
[21] MATSUOKA K, YAMASHITA T, KURAMOTO K, et al. Transformation of alkali and alkaline earth metals in low rank coal during gasification[J]. Fuel, 2008, 87(6):885-893.
[22] YANG Y, WU Y, ZHANG H, et al. Improved sequential extraction method for determination of alkali and alkaline earth metals in Zhundong coals[J]. Fuel, 2016, 181:951-957.
[23] 陈鸿伟,张志远,翟建军,等. 碱/碱土金属对煤热解影响的研究进展[J]. 热力发电, 2017, 46(1):1-6. CHEN H W, ZHANG Z Y, ZHAI J J, et al. Effect of alkali/alkaline earth metals on coal pyrolysis:research progress[J]. Thermal Power Generation, 2017, 46(1):1-6.
[24] SALORINNE K, NISSINEN M. Alkali metal complexation properties of resorcinarene bis-crown ethers:effect of the crown ether functionality and preorganization on complexation[J]. Tetrahedron, 2008, 64(8):1798-1807.
[25] STEED J W. First-and second-sphere coordination chemistry of alkali metal crown ether complexes[J]. Coordination Chemistry Reviews, 2001, 215(1):171-221.
[26] 张志远,陈鸿伟,于海龙,等. 冠醚对准东煤水洗液中碱/碱土金属离子萃取动力学[J]. 煤炭学报, 2017, 42(3):768-774. ZHANG Z Y, CHEN H W, YU H L, et al. Extraction kinetics of the alkali/alkaline earth metal in Zhundong coal with crown ether[J]. Journal of China Coal Society, 2017, 42(3):768-774.
[27] 余德才,曹文娟,吴海玉,等. 离子半径的质量和电量综合因子的标度[J]. 物理化学学报, 2007, 23(5):683-687. YU D C, CAO W J, WU H Y, et al. Ionic radius scale of establishing synthesis factor of ionic mass and electricity[J]. Acta Physico-Chimica Sinica, 2007, 23(5):683-687.
[28] WANG C, JIN X, WANG Y, et al. Release and transformation of sodium during pyrolysis of Zhundong coals[J]. Energy & Fuels, 2015, 29(1):78-85.
[29] 王智化,李谦,刘敬,等. 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. WANG Z H, LI Q, LIU J, et al. Occurrence of alkali metals in zhundong coal and its migration during pyrolysis process[J]. Proceedings of the CSEE, 2014, 34(s1):130-135.
[30] 陈川,张守玉,刘大海,等. 新疆高钠煤中钠的赋存形态及其对燃烧过程的影响[J]. 燃料化学学报, 2013, 41(7):832-838. CHEN C, ZHANG S Y, LIU D H, et al. Existence form of sodium in high sodium coals from Xinjiang and its effect on combustion process[J]. Journal of Fuel Chemistry and Technology, 2013, 41(7):832-838.
[31] LI X, BAI Z, BAI J, et al. Transformations and roles of sodium species with different occurrence modes in direct liquefaction of zhundong coal from Xinjiang, Northwestern China[J]. Energy & Fuels, 2015, 29(9):5633-5639.
[32] ZHANG H, GUO X, ZHU Z. Effect of temperature on gasification performance and sodium transformation of Zhundong coal[J]. Fuel, 2017, 189:301-311.
[33] LI G, LI S, HUANG Q, et al. Fine particulate formation and ash deposition during pulverized coal combustion of high-sodium lignite in a down-fired furnace[J]. Fuel, 2015, 143:430-437.
[34] 宋维健,宋国良,齐晓宾,等. 准东高钠煤气化过程中Na的迁移转化规律[J]. 煤炭学报, 2016, 41(2):490-496. SONG W J, SONG G L, QI X B, et al. Sodium transformation law of Zhundong coal during gasification[J]. Journal of China Coal Society, 2016, 41(2):490-496.
[35] SONG G, SONG W, QI X, et al. Transformation characteristics of sodium of Zhundong coal combustion/gasification in circulating fluidized bed[J]. Energy & Fuels, 2016, 30(4):3473-3478.
[36] 刘敬,王智化,项飞鹏,等. 准东煤中碱金属的赋存形式及其在燃烧过程中的迁移规律实验研究[J]. 燃料化学学报, 2014, 42(3):316-322. LIU J, WANG Z H, XIANG F P, et al. Modes of occurrence and transformation of alkali metals in Zhundong coal during combustion[J]. Journal of Fuel Chemistry and Technology, 2014, 42(3):316-322.
[37] 齐晓宾,宋国良,宋维健,等. 准东高碱煤气化过程中碱金属迁移与结渣特性实验研究[J]. 燃料化学学报, 2015(8):906-913. QI X B, SONG G L, SONG W J, et al. Alkali metal migration and slagging characteristic during Zhundong high-alkali coal gasification[J]. Journal of Fuel Chemistry and Technology, 2015(8):906-913.
[38] ZHANG J, HAN C L, YAN Z, et al. The varying characterization of alkali metals (Na, K) from coal during the initial stage of coal combustion[J]. Energy & Fuels, 2001, 15(4):786-793.
[39] 余春江,唐艳玲,方梦祥,等. 稻秆热解过程中碱金属转化析出过程试验研究[J]. 浙江大学学报(工学版), 2005(9):161-164. YU C J, TANG Y L, FANG M X, et al. Experimental study on alkali emission during rice straw pyrolysis[J]. Journal of Zhejiang University (Engineering Science), 2005(9):161-164.
[40] 孙鑫,赵斌,王子兵,等. SO₂和H₂O(g)对新疆高钠煤中钠挥发和形态迁移的研究[J]. 燃料化学学报, 2017(10):1178-1184. SUN X, ZHAO B, WANG Z B, et al. Effect of H₂O(g) and SO₂(g) on the volatilization and transformation of sodium during Xinjiang high sodium coal combustion[J]. Journal of Fuel Chemistry and Technology, 2017(10):1178-1184.
[41] WANG Y, WANG Z, HUANG J, et al. Catalytic gasification activity of Na₂CO₃ and comparison with K₂CO₃ for a high-aluminum coal char[J]. Energy & Fuels, 2015, 29(11):6988-6998.
[42] KWON T W, KIM J R, KIM S D, et al. Catalytic steam gasification of lignite char[J]. Fuel, 1989, 68(4):416-421.
[43] LI T, ZHANG L, DONG L, et al. Effects of char chemical structure and AAEM retention in char during the gasification at 900℃ on the changes in low-temperature char-O₂ reactivity for Collie sub-bituminous coal[J]. Fuel, 2017, 195:253-259.
[44] LI X, BAI Z, BAI J, et al. Effect of Ca²⁺ species with different modes of occurrence on direct liquefaction of a calcium-rich lignite[J]. Fuel Processing Technology, 2015, 133:161-166.
[45] WATANABE H, OKAZAKI K. Effect of minerals on surface morphologies and competitive reactions during char gasification in mixtures of O-2 and CO₂[J]. Proceedings of the Combustion Institute, 2015, 35(2):2363-2371.
[46] QUYN D M, WU H W, BHATTACHARYA S P, et al. Volatilisation and catalytic effects of alkali and alkaline earth metallic species during the pyrolysis and gasification of V_ictorian brown coal. Part Ⅱ. Effects of chemical form and valence[J]. Fuel, 2002, 81(2):151-158.
[47] DU C, LIU L, QIU P. Importance of volatile AAEM species to char reactivity during volatile-char interactions[J]. RSC Advances, 2017, 7(17):10397-10406.
[48] 许慎启,周志杰,代正华,等. 碱金属及灰分对煤焦碳微晶结构及气化反应特性的影响[J]. 高校化学工程学报, 2010, 24(1):64-70. XU S Q, ZHOU Z J, DAI Z H, et al. Effects of alkalimetal and ash on crystallite structure of coal char during pyrolysis and on gasification reactivity[J]. Journal of Chemical Engineering of Chinese Universities, 2010, 24(1):64-70.
[49] LI X, HAYASHI J, LI C. FT-Raman spectroscopic study of the evolution of char structure during the pyrolysis of a V_ictorian brown coal[J]. Fuel, 2006, 85(12/13):1700-1707.
[50] WANG L, MAO H, WANG Z, et al. Transformation of alkali and alkaline-earth metals during coal oxy-fuel combustion in the presence of SO₂ and H₂O[J]. Journal of Energy Chemistry, 2015, 24(4):381-387.
[51] 谢克昌. 煤的结构与反应性[M]. 北京:科学出版社, 2002. XIE K C. Structure and reactivity of coal[M]. Beijing:Science Press, 2002.
[52] LI R, CHEN Q, ZHANG H. Detailed investigation on sodium (Na) species release and transformation mechanism during pyrolysis and char gasification of high-Na Zhundong coal[J]. Energy & Fuels, 2017, 31(6):5902-5912.
[53] GAO Y, DING L, LI X, et al. Na & Ca removal from Zhundong coal by a novel CO₂-water leaching method and the ashing behavior of the leached coal[J]. Fuel, 2017, 210:8-14.
[54] LI G, WANG C, YAN Y, et al. Release and transformation of sodium during combustion of Zhundong coals[J]. Journal of the Energy Institute, 2016, 89(1):48-56.
[55] ZHANG J, LI J, MAO Y, et al. Effect of CaCO₃ addition on ash sintering behaviour during K₂CO₃ catalysed steam gasification of a Chinese lignite[J]. Applied Thermal Engineering, 2017, 111:503-509.
[56] YEBOAH Y D, XU Y, SHETH A, et al. Catalytic gasification of coal using eutectic salts:identification of eutectics[J]. Carbon, 2003, 41(2):203-214.
[57] XU L, LIU H, FANG H, et al. Effects of various inorganic sodium salts present in Zhundong coal on the char characteristics[J]. Fuel, 2017, 203:120-127.
[58] 卫小芳, 黄戒介, 房倚天, 等. 碱金属对褐煤气化反应性的影响[J]. 煤炭转化, 2007(4):38-42. WEI X F, HUANG J J, FANG Y T, et al. Effect of alkali metal on the lignite gasification reactivity[J]. Coal Conversion, 2007(4):38-42.
[59] 刘辉,赵登,姜雷宵,等. 羧酸钠对准东煤热解过程的影响[J]. 化工学报, 2016, 67(11):4795-4801. LIU H, ZHAO D, JIANG L X, et al. Effect of sodium carboxylate on pyrolysis of Zhundong coal(H-form coal)[J]. CIESC Journal, 2016, 67(11):4795-4801.
[60] ZHANG Z,PANG S, LEVI T. Influence of AAEM species in coal and biomass on steam co-gasification of chars of blended coal and biomass[J]. Renewable Energy, 2017, 101:356-363.
[61] ZHAO Y, QIU P, CHEN G, et al. Selective enrichment of chemical structure during first grinding of Zhundong coal and its effect on pyrolysis reactivity[J]. Fuel, 2017, 189:46-56.
[62] WANG Y, ZHU S, GAO M, et al. A study of char gasification in H₂O and CO₂ mixtures:role of inherent minerals in the coal[J]. Fuel Processing Technology, 2016, 141:9-15.
[63] BLAESING M, MUELLER M. Release of alkali metal, sulphur, and chlorine species from high temperature gasification of high-and low-rank coals[J]. Fuel Processing Technology, 2013, 106:289-294.
[64] JIANG L, HU S, WANG Y, et al. Catalytic effects of inherent alkali and alkaline earth metallic species on steam gasification of biomass[J]. International Journal of Hydrogen Energy, 2015, 40(45):15460-15469.
[65] WU L, QIAO Y, GUI B, et al. Effects of chemical forms of alkali and alkaline earth metallic species on the char ignition temperature of a loy yang coal under O₂/N₂ atmosphere[J]. Energy & Fuels, 2012, 26(1):112-117.
[66] VAN EYK P J, KOSMINSKI A, ASHMAN P J. Control of agglomeration and defluidization during fluidized-bed combustion of south australian low-rank coals[J]. Energy & Fuels, 2012, 26(1):118-129.
[67] ZHANG X, LIU H, XING H, et al. Improved sodium adsorption by modified kaolinite at high temperature using intercalation-exfoliation method[J]. Fuel, 2017, 191:198-203.
[68] WEI B, WANG X,TAN H, et al. Effect of silicon-aluminum additives on ash fusion and ash mineral conversion of Xinjiang high-sodium coal[J]. Fuel, 2016, 181:1224-1229.
[69] YAO Y, JIN J, LIU D, et al. Evaluation of vermiculite in reducing ash deposition during the combustion of high-calcium and high-sodium zhundong coal in a drop-tube furnace[J]. Energy & Fuels, 2016, 30(4):3488-3494.
[70] LI J, ZHU M, ZHANG Z, et al. Effect of coal blending and ashing temperature on ash sintering and fusion characteristics during combustion of Zhundong lignite[J]. Fuel, 2017, 195:131-142.
[71] LI J, ZHU M, ZHANG Z, et al. The mineralogy, morphology and sintering characteristics of ash deposits on a probe at different temperatures during combustion of blends of Zhundong lignite and a bituminous coal in a drop tube furnace[J]. Fuel Processing Technology, 2016, 149:176-186.
[72] ZHANG Z, ZHU M, ZHANG Y, et al. Ignition and combustion characteristics of single particles of Zhundong lignite:effect of water and acid washing[J]. Proceedings of the Combustion Institute, 2017, 36(2):2139-2146.
[73] 刘大海,张守玉,陈川,等. 新疆高钠煤脱钠提质过程中钠存在形式[J]. 煤炭学报, 2014, 39(12):2519-2524. LIU D H, ZHANG S Y, CHEN C, et al. Existence form of sodium in the high sodium coals from Xinjiang during its sodium removal process[J]. Journal of China Coal Society, 2014, 39(12):2519-2524.
[74] LI G, WANG C, YAN Y, et al. Release and transformation of sodium during combustion of Zhundong coals[J]. Journal of the Energy Institute, 2016, 89(1):48-56.
[75] 汉春利,张军,颜峥,等. 钠在煤燃烧初期释放特性的多元相关分析[J]. 燃烧科学与技术, 2002(5):395-398. HAN C L, ZHANG J, YAN Z, et al. Multivariate statistical analysis on the behaviour of sodium of coal in the initial stage of combustion[J]. Journal of Combustion Science and Technology, 2002(5):395-398.
[76] WANG Z, WANG L, LIN J, et al. The influence of the addition of sodium on the transformation of alkali and alkaline-earth metals during oxy-fuel combustion[J]. Journal of the Energy Institute, 2017, 91(4):502-512.
[77] GUO S, JIANG Y, YU Z, et al. Correlating the sodium release with coal compositions during combustion of sodium-rich coals[J]. Fuel, 2017, 196:252-260.
[78] 刘大海,张守玉,涂圣康,等. 五彩湾煤中钠在热解过程中的形态变迁[J]. 燃料化学学报, 2014(10):1190-1196. LIU D H, ZHANG S Y, TU S K, et al. Transformation and release of sodium in Wucaiwan coal pyrolysis[J]. Journal of Fuel Chemistry and Technology, 2014(10):1190-1196.
[79] 刘大海,张守玉,涂圣康,等. 五彩湾煤中钠在燃烧过程中的迁移释放规律[J]. 化工进展, 2015, 34(3):705-709. LIU D H, ZHANG S Y, TU S K, et al. Transformation and release of sodium in Wucaiwan coal during combustion[J]. Chemical Industry and Engineering Process, 2015, 34(3):705-709.
[80] LI W, WANG L, QIAO Y, et al. Effect of atmosphere on the release behavior of alkali and alkaline earth metals during coal oxy-fuel combustion[J]. Fuel, 2015, 139:164-170.
[81] KOSMINSKI A, ROSS D P, AGNEW J B. Transformations of sodium during gasification of low-rank coal[J]. Fuel Processing Technology, 2006, 87(11):943-952.
[82] WEI X, HUANG J, LIU T, et al. Transformation of alkali metals during pyrolysis and gasification of a lignite[J]. Energy & Fuels, 2008, 22(3):1840-1844.
[83] 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.
[84] 杨靖宁,张守玉,姚云隆,等. 高温热解过程中新疆高碱煤中钙的演变[J]. 煤炭学报, 2016(10):2555-2559. YANG J N, ZHANG S Y, YAO Y L, et al. Calcium transformation during the high -temperature pyrolysis process of high-alkali coal from Xinjiang[J]. Journal of China Coal Society, 2016(10):2555-2559.
[85] 黄小河,张守玉,杨靖宁,等. 准东煤高温燃烧过程中含钙矿物质的转化规律[J]. 化工学报, 2017, 68(10):3906-3911. HUANG X H, ZHANG S Y, YANG J N, et al. Calcium transformation during Zhundong coal combustion process[J]. CIESC Journal, 2017, 68(10):3906-3911.