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Behavior of alkali minerals in oxyfuel co-combustion of biomass and coal at elevated pressure
- Chansa, Oris (author)
- Luo, Zhong-yang (author)
-
- Zhang, Wennan (author)
- Mittuniversitetet,Institutionen för kemiteknik
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- Yu, Chun-jiang (author)
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- (creator_code:org_t)
- 2021
- 2021
- English.
- In: Journal of Zhejiang University: Science A. - 1673-565X. ; 22:2, s. 116-129
- Journal article (peer-reviewed)
Abstract
Subject headings
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- Combustion of biomass or coal is known to yield aerosols and condensed alkali minerals that affect boiler heat transfer performance. In this work, alkali behavior in the pressurized oxyfuel co-combustion of coal and biomass is predicted by thermodynamic and chemical kinetic calculations. Existence of solid minerals is evaluated by X-ray diffraction (XRD) analysis of ashes from pressure thermogravimetric combustion. Results indicate that a rise in pressure affects solid alkali minerals negligibly, but increases their contents in the liquid phase and decreases them in the gas phase, especially below 900 °C. Thus, less KCl will condense on the boiler heat transfer surfaces leading to reduced corrosion. Increasing the blend ratio of biomass to coal will raise the content of potassium-based minerals but reduce the sodium-based ones. The alkali-associated slagging in the boiler can be minimized by the synergistic effect of co-combustion of sulphur-rich coal and potassium-rich biomass, forming stable solid K2SO4 at typical fluidized bed combustion temperatures. Kinetics modelling based on reaction mechanisms shows that oxidation of SO2 to SO3 plays a major role in K2SO4 formation but that the contribution of this oxidation decreases with increase in pressure.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering (hsv//eng)
Keyword
- Chemical kinetic reactions
- Equilibrium calculations
- Mineral’s identifications
- Oxyfuel co-combustion
- Thermogravimetric combustion
- TK6
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Luo, Zhong-yang
- Zhang, Wennan
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