Stock Image

Modelling of Transformation and Deposition of Alkaline Compounds under Combustion Conditions

Silvia-Ioana Magda

Published by Shaker Verlag Dez 2012, 2012
ISBN 10: 3844015434 / ISBN 13: 9783844015430
New / Buch / Quantity Available: 2
From Agrios-Buch (Bergisch Gladbach, Germany)
Available From More Booksellers
View all  copies of this book
Add to basket
List Price:
Price: £ 40.84
Convert Currency
Shipping: £ 14.83
From Germany to U.S.A.
Destination, Rates & Speeds

Save for Later

About the Book

Bibliographic Details

Title: Modelling of Transformation and Deposition ...

Publisher: Shaker Verlag Dez 2012

Publication Date: 2012

Binding: Buch

Book Condition: Neu


Neuware - In coal fired power plants the mineral matter in coal can lead to operational difficulties, i.e. fouling, slagging and corrosion. In this work, the release and reactions of alkali during combustion of several coals are investigated by modelling at conditions that resemble pulverised coal combustion. The aim is to asses the extent of alkali dependence upon fuel ash composition, combustion temperature and secondary reactions, and to propose sub-models for alkali estimation. Two models for alkali release, based on alkali leaching analysis and chemical form of alkali are proposed. Equilibrium and kinetic studies of interactions between ash compounds show that aluminosilicates have a 'buffering' effect on alkali, thus reducing their release. Ca and Mg enhance alkali release, because they compete for silicates, leaving alkali as more volatile compounds. In absence of kinetic data, the effect of Ca and Mg over alkali-aluminosilicate reactions is taken into account by equilibrium factors. Kinetic and equilibrium calculations suggest that uncertainties in alkali initial form have little effect on alkali flame and post-flame chemistry. Thus, the alkali post-flame chemistry can be estimated based on the char conversion rate, temperature and molar ratios of alkali, chlorine and sulphur within fuel. Equilibrium and kinetic data agree well, with the exception of Na2SO4(g) formation - not predicted in significant amount by kinetic modelling for typical post-flame pulverised coal combustion conditions. The speciation data are used as input for calculations of gas-to-particle formation during cooling in the convective pass. Under studied conditions heterogeneous condensation occurring on heat exchanger tubes or particles is much higher than homogeneous condensation. The sub-models are combined into an Euler-Euler Computational Fluid Dynamics analysis tool. A large scale power plant is simulated. Three film formation models from literature are used to compute the alkali thickness layer. Based on empirical models, the physical and thermal properties of deposited layer and their influence on heat flux is discussed. The obtained results should be regarded as qualitative information. At the moment, a direct model validation cannot be undertaken. 140 pp. Englisch. Bookseller Inventory # 9783844015430

Bookseller & Payment Information

Payment Methods

This bookseller accepts the following methods of payment:

  • American Express
  • Bank/Wire Transfer
  • Check
  • Invoice
  • MasterCard
  • PayPal
  • Visa

[Search this Seller's Books]

[List this Seller's Books]

[Ask Seller a Question]

Bookseller: Agrios-Buch
Address: Bergisch Gladbach, Germany

AbeBooks Bookseller Since: 11 January 2012
Bookseller Rating: 5-star rating

Terms of Sale:

Allgemeine Geschäftsbedingungen (

der Firma Agrios Buch- und Medienversand UG e.K. ,Geschäftsführer Ludwig Meier, De-Gasperi-Str. 8, 51469 Bergisch Gladbach nachstehend als Verkäufer bezeichnet.

§ 1 Allgemeines, Begriffsbestimmungen

(1) Der Verkäufer bietet unter dem Nutzernamen Agrios Buch unter der Plattform insbesondere Bücher an. Die folgenden Allgemeinen Geschäftsbedingungen (AGB) gelten für die Geschäftsbeziehung zwischen dem Verkäufer und dem Kunden in ihrer zum Ze...

[More Information]

Shipping Terms:

Der Versand ins Ausland findet IMMER mit DHL statt. Auch nach Österreich verschicken wir nur mit DHL! Daher Standardversand == Luftpost!

Detailed Seller Information