ACARP ACARP ACARP ACARP
Technical Market Support

Prediction of Ash Phase Equilibria using FACT Models

Technical Market Support » Thermal Coal

Published: August 04Project Number: C10058

Get ReportAuthor: Eugene Jak, Dmitry Saulov | CCSD, University of Queensland

The behaviour of mineral matter at high temperatures in coal utilisation technologies is a major issue that influences coal value, marketing and resource utilisation. A wide variety of phenomena, such as the formation of slagging and fouling deposits in pf combustion, agglomeration in fluidised beds, ash slag flow in IGCC and other slagging reactors, and a number of other key high temperature phenomena are directly related to the formation of liquid slag (molten oxides) and to the stabilities of solid crystalline phases. The traditional methods used to characterise the high temperature behaviour of the coal inorganic material are becoming increasingly outdated and are unable to accurately predict the behaviour of ash and slag in coals and coal blends in existing and new power generation technologies.

This project has developed new fundamentally-based, predictive tools for application in coal utilisation technologies. These tools involve the use of the FactSage computer program and new thermodynamic databases. FactSage is an extremely powerful tool that is used to predict thermodynamic equilibrium in these systems. This highly sophisticated tool provides information on the phases formed, their proportions and compositions, the activities of individual chemical components and the thermodynamic properties for all compositions, oxygen partial pressures and temperatures.

For accurate predictions the FactSage program requires accurate and self-consistent thermodynamic databases. The new, state-of-the-art CCSD thermodynamic database for the system Al2O3-CaO-FeO-Fe2O3-Fe2O3-SiO2-MgO-K2O-Na2O has been completed. These are the principle chemical components present in mineral matter in coals. Development of the new CCSD thermodynamic database is a significant step in modelling of coal ash /slag systems. The new database, used in conjunction with the FactSage computer package, can describe the melting behaviour of ash in coals from around the globe, making it a key tool for future coal selection and blending by coal suppliers and utilities, coal mine planning and resource optimisation. The use of the tool will assist the development of new more efficient power generation technologies. The FactSage program and the use of the new databases having a significant impact on coal selection internationally (e.g. CRIEPI, ECN- Energy Research Centre of the Netherlands, EERC- North Dakota Energy & Environmental Research Center, Hongik University in South Korea, Chubu University Japan). FactSage is already being used in the design of step-change technologies in the evaluation and selection of coals for entrained flow coal gasification and blast furnace iron making by research teams in Japan and Korea (CRIEPI, Japan; Ishii Project, Japan; Posco, South Korea). These technologies represent the next generation of energy efficient processes with targets to greatly reduce greenhouse gas emissions and significantly improve energy efficiencies.

The phase equilibrium predictions are now also being used to solve longstanding problems in relation to the physical properties of complex oxide melts in coal ash systems. In particular, it is now possible to interpret and systematically analyse slag viscosity data, and the new thermodynamic models have been used in new advanced viscosity models enabling the viscosities of fully liquid and partially crystallised slags to be predicted.

The CCSD research team has also demonstrated how these advanced tools can be packaged in the form of customised computer software. The software retains accuracy over a wide range of compositions and was developed to provide assistance to coal marketing, sales and mine planning applications. The report describes
  • Important ash characteristics that can be predicted using FactSage,
  • The new CCSD database, and
  • Real and potential applications of the database to problems in coal utilisation.

Underground

Health and safety, productivity and environment initiatives.

Underground

Open Cut

Safety, productivity and the right to operate are priorities for open cut mine research.

Recently Completed Projects

C19024Establishing Ecologically Sustainable Mine Water Release Criteria In Seasonally Flowing Streams

Extreme rainfall conditions in the Fitzroy Catchment over an approxi...

C25030Coal Mine Open Pit Final Void Closure And Relinquishment - Addressing Uncertainty In Coal Mine Environmental Planning

This report addresses uncertainties faced by coal mine operators whe...

C27046Estimation Of True Deformation Vector From Slope Radar Monitoring

Slope deformation radar monitors are now widely used in open cut coa...

Open Cut

Coal Preparation

Maximising throughput and yield while minimising costs and emissions.

Recently Completed Projects

C27004Improving Coal Flotation With Oscillatory Air Supply

This report provides detailed information on coal flotation with os...

C25018Improving Solids Recovery And Moisture Reduction In Ultrafine Coal Dewatering

This report provides detailed information on fine coal dewatering in...

C27028Lab Froth Flotation Testing Guide With Coal Quality

Correct outcomes from laboratory froth flotation testing in coal bor...

Coal Preparation

Technical Market Support

Market acceptance and emphasising the advantages of Australian coals.

Recently Completed Projects

C26039Nanoporosity In Cokes: Their Origin, Control And Influence On CO2 Reactivity

This project using the outcomes of previous project C24060, examine...

C28063A Comprehensive Technical Review Of High-Efficiency Low-Emission (HELE) Pulverised Coal Combustion Technologies For Power Generation

Research and development has been undertaken worldwide to realise co...

C28064Carbon Structure Transformation During Coking Of Australian Coking Coals: Better Understanding The Coke Formation

Carbon structures of coke that are formed during the plastic layer a...

Technical Market Support

Mine Site Greenhouse Gas Mitigation

Mitigating greenhouse gas emissions from the production of coal.

Recently Completed Projects

C28076Selective Absorption Of Methane By Ionic Liquids (SAMIL) - Phase 2 Demonstration In A Packed Bed Reactor

An alternative approach to high temperature oxidation of ventilation...

C26004CFD Modelling Of Reverse Thermal Oxidisers For VAM Abatement - CFD Modelling Of Fixed-Bed RTO Devices

The project is part of a larger multi‐phase program of study a...

C27058Technological Assessment Of A Recycle Reactor For VAM Abatement

Underground coal mining emits high volumes of methane, diluted in ve...

Mine Site Greenhouse Gas Mitigation

Low Emission Coal Use

Step-change technologies aimed at reducing greenhouse gas emissions.

Recently Completed Projects

C17060BGasification Of Australian Coals

Four Australian coals were trialled in the Siemens 5 MWth pilot scale ga...

C17060AOxyfuel Technology For Carbon Capture And Storage Critical Clean Coal Technology - Interim Support

The status of oxy-fuel technology for first-generation plant is indicate...

C18007Review Of Underground Coal Gasification

This report consists of a broad review of underground coal gasification,...

Low Emission Coal Use

Mining And The Community

The relationship between mines and the local community.

Recently Completed Projects

C16027Assessing Housing And Labour Market Impacts Of Mining Developments In Bowen Basin Communities

The focus of this ACARP-funded project has been to identify a number...

C22029Understanding And Managing Cumulative Impacts Of Coal Mining And Other Land Uses In Regions With Diversified Economies

The coal industry operates in the context of competing land-uses that sh...

C23016Approval And Planning Assessment Of Black Coal Mines In NSW And Qld: A Review Of Economic Assessment Techniques

This reports on issues surrounding economic assessment and analysis ...

Mining And The Community

NERDDC

National Energy Research,Development & Demonstration Council (NERDDC) reports - pre 1992.

Recently Completed Projects

1609-C1609Self Heating of Spoil Piles from Open Cut Coal Mines

Self Heating of Spoil Piles from Open Cut Coal Mines

1301-C1301Stress Control Methods for Optimised Development...

Stress Control Methods for Optimised Development and Extraction Operations

0033-C1356Commissioned Report: Australian Thermal Coals...

Commissioned Report: Australian Thermal Coals - An Industry Handbook

NERDDC