Some metal compounds in coal vaporize and form fumes during combustion. The fumes are generally exhausted through the flue gas. For coal-fired combined power generation systems such as pressurized fluidized bed combustion (PFBC), hot vapors may contact with the surfaces of gas-turbine blades. As this contact of the hot vapors with the surface has corrosive effect, it is necessary to control the formation of those fumes, which mainly contain alkali metal compounds. In this paper, the evolution behavior of alkali metal compounds, especially for sodium compounds, has been studied, using an electrically heated drop tube furnace with a low-pressure impactor. The main objective in this study is to elucidate the conditions and the possible mechanisms to form alkali metal compounds in particulate matter during combustion. Two types of coal with different sodium content were tested, where the coal conversion characteristics were established. Furthermore, the evolution and inclusion of sodium compounds into the sub-micron particles were studied in relation to the particle size distribution formed and sodium fraction distribution in the collected fine particulates. The study proved that the evolution and inclusion of sodium in the sub-micron particles depended on function of type of coal via its composition and the form by which sodium compounds existed in coal. The reaction-controlled mechanism and heterogeneous condensation via chemical reactions during combustion affected the inclusion of sodium in the sub-micron particles. In the coarse particles of above about 0.5 μm, reaction that formed those particles was mainly via gas film diffusion surrounding the particle.
Skip Nav Destination
17th International Conference on Fluidized Bed Combustion
May 18–21, 2003
Jacksonville, Florida, USA
Conference Sponsors:
- Advanced Energy Systems
ISBN:
0-7918-3680-0
PROCEEDINGS PAPER
Effect of Coal Type on Emission Characteristics of Alkali Metal Compounds in Particulate Matters
Tsuyoshi Takuwa,
Tsuyoshi Takuwa
Toyohashi University of Technology
Search for other works by this author on:
Ichiro Naruse
Ichiro Naruse
Toyohashi University of Technology
Search for other works by this author on:
Tsuyoshi Takuwa
Toyohashi University of Technology
Ichiro Naruse
Toyohashi University of Technology
Paper No:
FBC2003-022, pp. 229-233; 5 pages
Published Online:
December 22, 2008
Citation
Takuwa, T, & Naruse, I. "Effect of Coal Type on Emission Characteristics of Alkali Metal Compounds in Particulate Matters." Proceedings of the 17th International Conference on Fluidized Bed Combustion. 17th International Conference on Fluidized Bed Combustion. Jacksonville, Florida, USA. May 18–21, 2003. pp. 229-233. ASME. https://doi.org/10.1115/FBC2003-022
Download citation file:
6
Views
Related Proceedings Papers
Advanced Particle Control for Coal-Based Power Generation Systems
JPGC1989-GTPapers
Related Articles
Advanced Hot Gas Cleaning System for Coal Gasification Processes
J. Eng. Gas Turbines Power (April,1994)
Two-Dimensional Spectroscopic Observation of Nonluminous Flames in a Regenerative Industrial Furnace Using Coal Gas
J. Eng. Gas Turbines Power (January,2004)
In-Furnace Sulfur Capture by Cofiring Coal With Alkali-Based Sorbents
J. Energy Resour. Technol (July,2017)
Related Chapters
Numerical Simulation Research on a Fixed Bed Gasifier
International Conference on Information Technology and Management Engineering (ITME 2011)
Alternative Coal-Fired Power Plant Concepts (FBC and IGCC)
Clean and Efficient Coal-Fired Power Plants: Development Toward Advanced Technologies
Evaluation of Moisture Accumulation in Composite Roof Decks in High Humidity Environments such as Natatoriums in Cold Climates Using Hygrothermal Modeling
Roofing Research and Standards Development: 10th Volume