Abstract
Extensive literature and research results are availible which are directed at analyzing or predicting the tendency of coal ash to deposit in radiant furnaces and onto convective surfaces. However, these results are generally based upon conventional pulverized coal (PC) furnace designs,combustion systems, and fuels utilized over the last 40 years. Such conventional systems are being supplanted on some new units by combustion systems designed to respond to recent changes in the market place.
Some recent changes in the market which ultimately affect the furnace combustion processes can be cited. Environmental laws have placed greater importance on reducing emissions of NOx, CO, SO2 and air toxics. Similarly, there is some political support to reduce global emissions of CO2 and N2O, and one response has been the introductory commercial usage of PC-based combined cycles. And finally, there is an increase in the practice of world sourcing for coal supplies for a single power station, leading to the need to design a single furnace to reliably combust as many as 20 disparate fuels. This trend may accelerate in Pacific Rim nations due to the reduction in imported fuel tariffs associated with recent open trade agreements.
This paper outlines some changes in operation and design of new pulverized coal fired radiant utility furnaces which affect coal ash deposition, including the following:
Deep staging, substochiometric combustion
Rotating dynamic classsifiers
Individual coal burner flame analyzers
World sourcing of coal supplies
Fully fired (hot windbox) combined cycles, with and without pyrolysis
Pulsating combustion
Preheating of coal-air mixture upstream of burner nozzle
Miscellaneous effects (waterwall tube orientation, indirect bin fired system, water deslaggers)
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Fiveland, W., et al, “ An Efficient Method for Predicting Unburned Carbon in Boilers”, Comb.Sci.andTech.,V81 no4–6, 1992, p147–167
Marcus,H., “Grosse Dampferzeuger mit Steinkohlen-Staubfeuerung und Trockenentaschung”, Energie und Technik, Heft 7 /8, 1974, p179–186
Singh, B.,“Pulverized Fuel Size Distribution Influence in a Power Generating Utility Boiler”, proc. 1994 ACTC Workshop on the Impact of Coal Quality on Power Plant Performance,Brisbane, Australia, 15May94.
Miyamae,S., et al, “Nox and unburned Carbon Simulation Technologies on Pulverized Coal firing Boiler”, IHI Eng. Rev.,V20no2 Apr87,p56–60
Hashimoto,H., et al, “Developement of a Flame Diagnostic System for a coal-firing Boiler”, ASME paper 92-JPGC-EC-2, presented at the IJPGC conference, Atlanta, 18Oct92.
Kehr, M. et al, “800MW Brown coal fired Steam Generator Schwarze Pumpe”,17May94 PowerGen conference, Cologne, Germany, Penwell Pub, Houston, Tx.
Bennert,J.,“Auslegungskriterion fur grosse Steinkohleblocke”,VDI-Berichte, Nr454,1982,p95101
Joyce, J. S. “How Gas Turbines can Improve the Efficiency and Environmental Compatability of new and old Steam Power Plants”, Proc. ASME-JSME Int Conf on Pow Eng(ICOPE-93),Sept 1993(Tokyo)p469–474.
Termuehlen, H.,et al, “Repowering Existing Power Stations with Heavy Duty Gas Turbines-An Economical Approach”, Proc. PowerGen, 5th int’l Conf, Orlando, 1992,v11p235–244.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1996 Springer Science+Business Media New York
About this chapter
Cite this chapter
Fitzgerald, D. (1996). Evolutionary Changes in Furnace Combustion Conditions Which Affect Ash Deposition in Modern Boilers. In: Baxter, L., DeSollar, R. (eds) Applications of Advanced Technology to Ash-Related Problems in Boilers. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9223-2_3
Download citation
DOI: https://doi.org/10.1007/978-1-4757-9223-2_3
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4757-9225-6
Online ISBN: 978-1-4757-9223-2
eBook Packages: Springer Book Archive