SULFATION OF DOLOMITE PARTICLES AT HIGH CO2 PARTIAL PRESSURES

被引:14
|
作者
FUERTES, AB
VELASCO, G
ALVAREZ, T
FERNANDEZ, MJ
机构
[1] Instituto Nacional del Carbón, 33080 Oviedo
关键词
CARBON DIOXIDE; DOLOMITE; HIGH PARTIAL PRESSURE; SULFATION;
D O I
10.1016/0040-6031(94)02067-X
中图分类号
O414.1 [热力学];
学科分类号
摘要
The sulfation reaction of half-calcined dolomite particles at high CO2 partial pressures (around 1 bar) was investigated. The experiments were carried out in two different reactors: (a) a thermogravimetric analysis system (slow heating rates) and (b) a shock-microreactor (rapid heating rates). The experiments were carried out under isothermal conditions at temperatures between 650 and 875 degrees C. A natural dolomite sample was used. Different particle sizes were tested: 26, 128, 256 and 512 mu m. Under reaction conditions employed in the experiments (P-CO2 approximate to 1 atm and T < 900 degrees C), half-calcination of dolomite particles takes place and the sulfation reaction occurs between CaCO3 . MgO and SO2. The CaCO3 is the only active species during sulfation. The particle size and temperature have a strong influence on the variation in extent of conversion with time. Two different stages can be distinguished in the sulfation of half-calcined dolomite particles; chemical control at the onset of reaction and diffusional control at longer reaction times. When the sulfation reaction is carried out under conditions similar to those existing in a boiler (high heating rates and simultaneous calcination and sulfation), the measured reaction rates are higher than those observed from thermogravimetric experiments. At X = 0.1 an activation energy of 34 kcal mol(-1) (142 kJ mol(-1)) was measured. This value suggests that the process is controlled by a solid state diffusion mechanism.
引用
收藏
页码:63 / 78
页数:16
相关论文
共 50 条
  • [1] STUDY OF THE DIRECT SULFATION OF LIMESTONE PARTICLES AT HIGH CO2 PARTIAL PRESSURES
    FUERTES, AB
    VELASCO, G
    FUENTE, E
    ALVAREZ, T
    FUEL PROCESSING TECHNOLOGY, 1994, 38 (03) : 181 - 192
  • [2] PARTIAL DECOMPOSITION OF DOLOMITE IN CO2
    HASHIMOTO, H
    KOMAKI, E
    HAYASHI, F
    UEMATSU, T
    JOURNAL OF SOLID STATE CHEMISTRY, 1980, 33 (02) : 181 - 188
  • [3] THE SOLUBILITY OF DOLOMITE IN WATER AND SOLUTIONS OF CALCIUM SULFATE AT VARIOUS PARTIAL PRESSURES OF CO2
    YANATEVA, OK
    JOURNAL OF INORGANIC CHEMISTRY-USSR, 1956, 1 (07): : 18 - 23
  • [4] Kinetics and rate-limiting mechanisms of dolomite dissolution at various CO2 partial pressures
    Liu, ZH
    Wolfgang, D
    SCIENCE IN CHINA SERIES B-CHEMISTRY, 2001, 44 (05): : 500 - 509
  • [5] Kinetics and rate-limiting mechanisms of dolomite dissolution at various CO2 partial pressures
    Zaihua Liu
    Dreybrodt Wolfgang
    Science in China Series B: Chemistry, 2001, 44 : 500 - 509
  • [6] Kinetics and rate-limiting mechanisms of dolomite dissolution at various CO2 partial pressures
    刘再华
    DreybrodtWolfgang
    Science China Chemistry, 2001, (05) : 500 - 509
  • [7] GROWTH OF SOYBEAN AND POTATO AT HIGH CO2 PARTIAL PRESSURES
    WHEELER, RM
    MACKOWIAK, CL
    SAGER, JC
    KNOTT, WM
    LIFE SCIENCES AND SPACE RESEARCH XXV (3): NATURAL AND ARTIFICIAL ECOSYSTEMS, 1994, 14 (11): : 251 - 255
  • [8] Metal release from limestones at high partial-pressures of CO2
    Wunsch, Assaf
    Navarre-Sitchler, Alexis K.
    Moore, Joel
    McCray, John E.
    CHEMICAL GEOLOGY, 2014, 363 : 40 - 55
  • [9] Metal release from dolomites at high partial-pressures of CO2
    Wunsch, Assaf
    Navarre-Sitchler, Alexis K.
    Moore, Joel
    Ricko, Allison
    McCray, John E.
    APPLIED GEOCHEMISTRY, 2013, 38 : 33 - 47
  • [10] Sulfation of CaO particles in a carbonation/calcination loop to capture CO2
    Grasa, Gerruna S.
    Alonso, Monica
    Abanades, J. Carlos
    INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2008, 47 (05) : 1630 - 1635