Hostname: page-component-8448b6f56d-mp689 Total loading time: 0 Render date: 2024-04-23T15:25:16.871Z Has data issue: false hasContentIssue false
  • English
  • Français

The behaviour of mineral matter during combustion of Spanish subbituminous and brown coals

Published online by Cambridge University Press:  05 July 2018

X. Querol ,
J. L. Fernandez Turiel  and
A. Lopez Soler
X. Querol
Affiliation:
Institute of Earth Sciences “Jaime Almera” CSIC, C/Marti i Franques s/n 08028, Barcelona, Spain
J. L. Fernandez Turiel
Affiliation:
Institute of Earth Sciences “Jaime Almera” CSIC, C/Marti i Franques s/n 08028, Barcelona, Spain
A. Lopez Soler
Affiliation:
Institute of Earth Sciences “Jaime Almera” CSIC, C/Marti i Franques s/n 08028, Barcelona, Spain
Get access Rights & Permissions [Opens in a new window]

Abstract

Combustion experiments up to 1400°C were carried out with subbituminous coals from the Teruel power station, the Teruel Mining District, the Santa Eulalia coal deposit and with lignite from the As Pontes power station in Spain. The characterisations of the occurrence and distribution of inorganic matter and its transformation during combustion of these coals were carried out by means of X-ray diffraction and optical and electron microscopy. The combustion experiments show that the incorgainc transformations during the combustion of all the coals studied vary depending on the sulphur and calcium contents. The sulphur, iron and calcium contents govern the quality of anhydrite crystallisation (which takes place between 600 and 900°C Furthermore, the high calcium oxide content produces the fouling of the combustion wastes at relatively low temperatures (1200°C), prevents the occurrence of mullite and magnetite in the ashes and leads to the crystallistation of anorthite and esseneite during the colling. The comparison of the inorganic phases of fly ashes and slags from the Teruel power station with those of the experimental wastes shows that the inorganic transformations during coal combustion in the power station can be predicted by means of laboratory furnace experiments provided that the residence time in the flame and the effect of the cooling and evacuation controls of gases and particles from the power station are taken in consideration.

Keywords

coalcoal combustionmineral matterX-ray diffraction
Type
Petrology and Geochemistry
Information
Mineralogical Magazine , Volume 58 , Issue 390 , March 1994 , pp. 119 - 133
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1994

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Chinchon J. S., Querol, X., Fernandez Turiel, J. L. and Lopez Soler, A. (1991) Environmental impact of mineral transformations undergone during coal combustion. Environ. Geol. Water Set, 18, 11–15.Google Scholar
Chung, F. H. (1974a) Quantitative interpretation of X-ray diffraction patterns of mixtures. I: Matrix flushing method for quantitative multicomponent analysis. J. Appl. Crystallogr. 7, 519-25.Google Scholar
Chung, F. H. (1974b) Quantitative interpretation of X-ray diffraction patterns of mixtures. II: Adia-batic principle of X-ray diffraction analysis of mixtures. J. Appl. Crystallogr., 7, 526-31.Google Scholar
Chung, F. H. (1975) Quantitative interpretation of X-ray diffraction patterns mixtures. III: Simulta-neous determination of a set of reference intensities. J. Appl. Crystallogr., 8, 17–19.CrossRefGoogle Scholar
Fernandez Turiel, J. L., Querol, X., Ramirez, C, Lopez Soler, A. and Neikov, C. (1990) Miner-alogical characterization of fly ashes from Spanish thermal power stations. Proc. 15th General Meeting Inst. Mineral. Assoc, Beijing, 1, 170.Google Scholar
Felgueroso, J., Martinez Alonso, A., Martinez Tarazona, M. R., and Tascon, J. M. D. (1988) The determination of mineral matter content of low rank coals. J. Coal Quality, 7, 127–31.Google Scholar
Finkelman, R. B. (1982) Modes of occurrence of trace elements and minerals in coal: an analytical approach. In Atomic and nuclear Methods in Fossil Energy Research (R. H. Filby, B. S. Carpenter and R. C. Ragaini, eds.), Plenum, 141-9.Google Scholar
Furuya, K., Miyajima, Y. Chiba, T., and Kikuchi, T. (1987) Elemental Characterization of Particle Size-Density separated Coal Fly Ash by Spectro-photometry. Inductively Coupled Plasma Emission Spectrometry, and Scanning Electron Microscopy-Energy Dispersive X-ray Analysis. Environ. Sci. Techno!., 21, 898–903.CrossRefGoogle Scholar
Martinez Alonso, A., Martinez Tarazona, M. R., Cardin, J. M., and Tascon, J. M. D. (1987) The nature and characteristics of mineral matter present in Spanish brown coals used for combustion. Proc. 1st. Europ. Conf., Influence of inorganic constituents on coal combustion. 1/6, 1-8.Google Scholar
Martinez Tarazona, M. R., Palacios, J. M., and Tascon, J. M. D. (1990) SEM-EDX characteriza-tion of inorganic constituents of brown coal. Inst. Phys. Conf. Ser., 98, 327–30.Google Scholar
Martinez Tarazona, M. R., Palacios, J. M., J. M., Martinez Alonso, A. and Tascon, J. M. D. (1990) The characterzation of organomineral components of low-rank coals. Fuel Proc. Technology, 25, 81–87.CrossRefGoogle Scholar
Osborn, E. F. and Muan, A. (1960) Phase equilibrium diagrams of oxide systems. American Ceramic Society, Columbus, 1025 pp.Google Scholar
Querol, X., Chinchon, J. S., and Lopez Soler, A. (1989) Iron sulfide precipitation sequence in Albian coals from the Maestrazgo Basin (NE Spain). Int. J. Coal Geol., 11, 171–89.CrossRefGoogle Scholar
Querol, X. (1990) Distribution of sulfur and mineral matter in the Escucha Fm. Coals. Relationship with the geological, sedimentological and diagenetic factors. (Spanish). Unpubl. Ph.D. Thesis, University of Barcelona, 545 pp.Google Scholar
Querol, X., Fernandez Turiel, J. L., Chinchon, J. S., and Lopez Soler, A. (1990) Paragenetic sequence during deposition and diagenesis in lower Cretac-eous coal seams of NE Spain. Proc. 15th General Meeting Int. Mineral Assoc, Beijing, 2, 728–30.Google Scholar
Querol, X., Fernandez, J. L. Lopez, A., Hagemann, H. W., Dehmer, J., Juan, R., and Ruiz, C. (1991) Distribution of sulfur in coals of the Teruel Mining District (NE Spain). Int. J. Coal Geol, 18, 327–48.CrossRefGoogle Scholar
Querol, X., Alastuey, A., Chinchon, J. S., Fernandez, J. L. Lopez, A. (1993) Determination of pyritic sulfur and organic matter in coals by X-ray powder diffraction. Int. J. Coal Geol., 22, 279–293.CrossRefGoogle Scholar
Raask, E. (1985) Mineral Impurities in Coal Combustion. Behaviour, Problems and Remedial Measures. Springer-Verlag, Berlin, 484 pp.Google Scholar
Raask, E. and Goetz L. (1981) Characterization of captured ash, chimney stack solids and trace elements. J. Inst. Energy, 54, 163–9.Google Scholar
Smith, I. (1987) Trace elements from coal combustions: emissions. IEA Coal Research, London, 87 pp.Google Scholar
Smykatz-Kloss, W. (1974) Differential Thermal Analysis. Application and Results in Mineralogy. Minerals and Rocks, 11, Springer-Verlag. 185 pp.Google Scholar