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不同反应气氛下准东高钠煤中钠的迁移转化与积灰特性

杨少波 宋国良 宋维健 齐晓宾

杨少波, 宋国良, 宋维健, 齐晓宾. 不同反应气氛下准东高钠煤中钠的迁移转化与积灰特性[J]. 燃料化学学报(中英文), 2016, 44(9): 1051-1058.
引用本文: 杨少波, 宋国良, 宋维健, 齐晓宾. 不同反应气氛下准东高钠煤中钠的迁移转化与积灰特性[J]. 燃料化学学报(中英文), 2016, 44(9): 1051-1058.
YANG Shao-bo, SONG Guo-liang, SONG Wei-jian, QI Xiao-bin. Transformation and deposition characteristics of sodium in Zhundong high sodium coal under different reaction atmospheres[J]. Journal of Fuel Chemistry and Technology, 2016, 44(9): 1051-1058.
Citation: YANG Shao-bo, SONG Guo-liang, SONG Wei-jian, QI Xiao-bin. Transformation and deposition characteristics of sodium in Zhundong high sodium coal under different reaction atmospheres[J]. Journal of Fuel Chemistry and Technology, 2016, 44(9): 1051-1058.

不同反应气氛下准东高钠煤中钠的迁移转化与积灰特性

基金项目: 

中国科学院战略性先导科技专项(A类) XDA07030100

国家国际科技合作专项 2014DFG61680

详细信息
    通讯作者:

    宋国良, E-mail: songgl@iet.cn

  • 中图分类号: TQ530.2

Transformation and deposition characteristics of sodium in Zhundong high sodium coal under different reaction atmospheres

Funds: 

the Strategic Priority Research Program of the Chinese Academy of Sciences XDA07030100

the International Science & Technology Cooperation Program of China 2014DFG61680

  • 摘要: 为了获得循环流化床工艺下不同反应气氛对准东高钠煤中钠的迁移转化与积灰特性的影响,在0.4 t/d循环流化床实验装置上开展了相同床温(950℃)下的新疆沙尔湖高钠煤的气化(还原性气氛)与燃烧(氧化性气氛)实验研究。结果表明,气化和燃烧气氛下飞灰与积灰中Na主要以NaCl的形式存在;气化比燃烧更容易将Na、Cl固留在底渣和飞灰中,相应的进入气相中的Na、Cl更少;燃烧气氛下,部分NaCl会被烟气中的SO2硫化,生成稳定性更高的Na2SO4并冷凝在飞灰和积灰棒表面,燃烧过程中产生的飞灰粒径更细,积灰更严重;沙尔湖煤燃烧与气化过程中存在HCl对金属壁面的腐蚀。
  • 图  1  沙尔湖煤的XRD谱图

    a: CaCO3; b: NaCl; c: SiO2; d: CaSO4

    Figure  1  XRD patterns analysis of SEHc

    图  2  0.4 t/d循环流化床实验装置示意图(测点位置)

    1: primary air; 2: coal hopper; 3: screw feeder; 4: coal spreading air; 5: riser; 6: cyclone separator; 7: loop seal; 8: recirculation air; 9: flue gas; T1-T11: temperature measuring point; a: slag sampling; b: cyclone fly ash sampling; c: tail fly ash sampling; d: deposition probe

    Figure  2  CFB system of 0.4 t/d for high alkali coal thermochemical conversion experiments (measuring point location)

    图  3  底渣与飞灰样品的XRF谱图

    (a):bottom slag; (b):cyclone fly ash

    Figure  3  XRF analysis of bottom ash and fly ash samples

    图  4  底渣与旋风飞灰样品的XRD谱图

    a: SiO2; b: NaAlSiO4; c: Ca2Al2SiO7; d: NaCl; e: Ca2MgSi2O7; f: Ca12Al14O33; g: KNa3(AlSiO4)4; h: Ca3Fe2(SiO4)3; i: Fe2O3; j: Al2O3; k: MgO; m: CaSO4; n: Na2SO4; o: Na8(SO4)(Al6Si6O24); r: K2SO4

    Figure  4  XRD patterns analysis of bottom ash and fly ash samples (a): bottom slag; (b): cyclone fly ash

    图  5  积灰棒积灰形貌

    Figure  5  Deposition morphology of deposition probe (a): windward side of combustion; (b): leeside of combustion; (c): windward side of gasification; (d): leeside of gasification

    图  6  尾部积灰棒积灰样品的XRD谱图

    a: SiO2; b: NaAlSiO4; c: Ca2Al2SiO7; d: NaCl; e: Fe2O3; f: Ca12Al14O33; g: CaSO4; h: Na2SO4; i: FeS; k: KCl; n: FeCl3; o: CaCl2

    Figure  6  XRD patterns of ash samples on depositon probes

    图  7  尾部飞灰与积灰样品的粒径分布

    (a): fly ash; (b): deposition ash

    Figure  7  Particle size distribution of fly ash and deposition ash samples of tail

    图  8  不同反应气氛下飞灰样品的SEM-EDS分析

    (a), (a′): gasification fly ash; (b), (b′): combustion fly ash; (a): ×500; (b): ×1 000; (a′), (b′): ×5 000

    Figure  8  SEM-EDS analysis of fly ash samples in different reaction atmospheres

    表  1  沙尔湖煤的煤质分析

    Table  1  Analysis of SEHc

    Proximate analysis w/% Ultimate analysis w/% Lower heating value
    Qar, net/(MJ·kg-1)
    Chemical components in ash w/% Ash fusion temperature t/℃
    Mar Ad Vdaf FCd C N H O S Cl SiO2 Al2O3 Fe2O3 CaO MgO TiO2 SO3 P2O5 K2O Na2O DT ST HT FT
    11.02 14.66 30.46 43.86 51.54 0.58 2.36 19.73 0.11 1.138 17.93 41.98 17.59 6.87 19.39 2.49 1.08 1.82 0.18 0.66 4.38 1 120 1 130 1 140 1 150
    下载: 导出CSV

    表  2  沙尔湖煤中不同赋存形态Na的分布

    Table  2  Different occurrence modes of alkali metals in SEHc

    Alkali metal Content w/%
    water soluble ammonium acetate soluble hydrochloric acid soluble insoluble
    Na 88.51 7.88 1.81 1.8
    下载: 导出CSV

    表  3  高岭土的化学成分分析

    Table  3  Chemical analysis of kaolin

    Component SiO2 Al2O3 K2O TiO2 Fe2O3 MgO Na2O CaO Cr2O3 Others
    Content w/% 83.91 12.01 1.45 0.94 0.59 0.14 0.12 0.09 0.03 0.72
    下载: 导出CSV

    表  4  工况下沿程温度分布

    Table  4  Temperature distribution along the path under working condition

    Atmosphere Temperature t/℃
    T2 T6 T8 T9 T10 Tc Td
    Combustion 950 944 904 811 730 701 580
    Gasification 952 941 917 816 726 697 572
    下载: 导出CSV
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  • 收稿日期:  2016-04-05
  • 修回日期:  2016-05-31
  • 网络出版日期:  2021-01-23
  • 刊出日期:  2016-09-10

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