Existence and release of sodium in Zhundong coal: effects of treating temperature and silica additives

被引:11
作者
Yang, Tao [1 ]
Wang, Xuebin [1 ]
Tan, Houzhang [1 ]
Wei, Bo [1 ]
Deng, Shuanghui [1 ]
Zhang, Limeng [1 ]
Zhang, Huiyan [2 ]
机构
[1] Xi An Jiao Tong Univ, Sch Energy & Power Engn, MOE Key Lab Thermofluid Sci & Engn, Xian 710049, Shannxi, Peoples R China
[2] Southeast Univ, Minist Educ, Key Lab Energy Thermal Convers & Control, Nanjing 210096, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
Zhundong coal; combustion; ash; sodium; SiO2; ALKALI-METAL COMPOUNDS; COMBUSTION; MECHANISMS; PARTICLES;
D O I
10.1504/IJOGCT.2016.073774
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Zhundong coalfield is the largest integrated coal basin in China and has been only recently discovered. Zhundong coal contains a high amount of sodium, which induces severe slagging. In this study, the existence and transformation of alkali and alkali earth metals in Zhundong coal were investigated, and the effects of treating temperature and silica additives were determined. The results show that most of the Na and partial Ca species in raw Zhundong coal and ash were soluble. Sulphates were found in ash and did not decompose until 1,150 degrees C. In the ash prepared at 500 degrees C, a specific amount of MgCa(CO3)(2) was found in the ash and decomposed at >600 degrees C. The release of Na during ashing is mainly attributed to water-soluble Na because of the insignificant change in the acid-soluble and insoluble Na content in ash with increasing treating temperature. Silica additives have an effective function in capturing Na species at high temperatures. With increasing additive mass, the relative content of water-soluble Na is significantly reduced, but more water-insoluble Na is retained in the residual ash.
引用
收藏
页码:63 / 74
页数:12
相关论文
共 18 条
  • [1] Mass spectrometric investigations on the release of inorganic species during gasification and combustion of German hard coals
    Blaesing, Marc
    Mueller, Michael
    [J]. COMBUSTION AND FLAME, 2010, 157 (07) : 1374 - 1381
  • [2] Geochemistry of trace elements in Chinese coals: A review of abundances, genetic types, impacts on human health, and industrial utilization
    Dai, Shifeng
    Ren, Deyi
    Chou, Chen-Lin
    Finkelman, Robert B.
    Seredin, Vladimir V.
    Zhou, Yiping
    [J]. INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2012, 94 : 3 - 21
  • [3] Sewage sludge as a deposit inhibitor when co-fired with high potassium fuels
    Elled, A. L.
    Davidsson, K. O.
    Amand, L. E.
    [J]. BIOMASS & BIOENERGY, 2010, 34 (11) : 1546 - 1554
  • [4] Harbin Boiler Co L, 2012, INV COMB CHAR ZHUND
  • [5] In-situ Measurement of Sodium and Potassium Release during Oxy-Fuel Combustion of Lignite using Laser-Induced Breakdown Spectroscopy: Effects of O2 and CO2 Concentration
    He, Yong
    Zhu, Jiajian
    Li, Bo
    Wang, Zhihua
    Li, Zhongshan
    Alden, Marcus
    Cen, Kefa
    [J]. ENERGY & FUELS, 2013, 27 (02) : 1123 - 1130
  • [6] Environmental geochemistry of the feed coals and their combustion by-products from two coal-fired power plants in Xinjiang Province, Northwest China
    Li, Jing
    Zhuang, Xinguo
    Querol, Xavier
    Font, Oriol
    Moreno, Natalia
    Zhou, Jibin
    [J]. FUEL, 2012, 95 (01) : 446 - 456
  • [7] Influence of coal composition on the release of Na-, K-, Cl-, and S-species during the combustion of brown coal
    Oleschko, Holger
    Schimrosczyk, Annette
    Lippert, Hannelore
    Mueller, Michael
    [J]. FUEL, 2007, 86 (15) : 2275 - 2282
  • [8] Rys M, 2007, INVESTIGATION THERMD
  • [9] Emissions of mercury, trace elements, and fine particles from stationary combustion sources
    Senior, CL
    Helble, JJ
    Sarofim, AF
    [J]. FUEL PROCESSING TECHNOLOGY, 2000, 65 : 263 - 288
  • [10] Mechanisms of fine particulates formation with alkali metal compounds during coal combustion
    Takuwa, T
    Mkilaha, ISN
    Naruse, I
    [J]. FUEL, 2006, 85 (5-6) : 671 - 678