Course Home | EERC | Education, Training, & Outreach      
Contact Us      

Ash Behavior Course Outline
Ash Transformation and Deposition

Introduction: The introduction overviewed the course content and introduced the EERC and course presenters to participants.
 
Inorganic Composition of Coal and Ash: The inorganic constituents contained in coal were discussed in relation to their form and distribution. The origin of the different forms of inorganic material present in the coal was presented. Characterization methods, both standard and advanced, were explained and their respective positive and negative attributes presented.
 
Ash Formation During Combustion: Ash formation processes and transformations play a significant role in the fouling and slagging propensity of a coal. These factors were presented with examples taken from EERC research related to full-scale systems.
 
Mechanisms of Ash Transport: Mechanisms of ash transport to the heat-transfer surface were discussed. These mechanisms include inertial impaction, vapor-phase diffusion, small-particle diffusion, and eddy impaction.
 
Deposit Adhesion/Growth/Strength Mechanisms: Ash deposition mechanisms were presented in this session. The relationship of the viscosity of ash particles, deposit growth, and strength development was elucidated. The relationship of the physical and chemical environment around the heat-transfer surfaces and the ash particles and their effect on deposition, including sulfation of alkali and alkaline-earth elements, were also discussed in this session.
 
Predictive Methods: Advanced methods of predicting ash deposition were presented along with traditional indices used in the power generation industry. These include indices based on bulk coal analysis, models based on advanced analytical techniques, thermochemical equilibrium models, and CFD modeling. The use and benefits of these predictive methods were covered in this section.
 
Summary: This section gave a thorough summary of the course and lead into specific information and discussion of the participants' specific systems.

Course Topics

Day 1: Ash Behavior

Course Description

Agenda

Course Instructors

Course Outline

Day 2: Mercury Control

Course Description

Agenda

Course Instructors

Course Outline

Downloads

Ash Behavior Brochure (PDF)

Mercury Control Brochure (PDF)

English was the official language of these short courses.
© 1992-2006 University of North Dakota Energy & Environmental Research Center (UND EERC).