Technical Market Support

Thermal Study of the Coking Behaviour of Thermoplastic Coals

Technical Market Support » Metallurgical Coal

Published: December 07Project Number: C15067

Get ReportAuthor: Vladimir Strezov, Anthony Morrison, Peter Nelson | Macquarie University

The objectives of this research were to apply laboratory bench-scale experiments to study the coking behaviour of Australian thermoplastic coals and correlate the results with coke tests obtained under large scale research coke oven conditions.  A novel thermoanalytical technique (Computer Aided Thermal Analysis) was applied for thermal evaluation of specific heat, heats of reactions, thermal conductivity and diffusivity of the coals during their pyrolysis. Volatiles liberated during pyrolysis of the coals were evaluated using a micro gas chromatograph, while the tars were condensed at room temperature and characterised with matrix-assisted laser desorption/ionisation mass spectrometer (MALDI). Thermogravimetric analysis was employed to measure volatile matter release with temperature during pyrolysis.

Coke was prepared from the same coal samples under laboratory and under research coke oven conditions. A small coking reactor was designed to prepare coke samples under laboratory bench-scale conditions. The reactor utilised ~80 g of coal. The research coke oven tests were conducted separately by BHP Billiton Newcastle Technology Centre and the coke test results were obtained under defined process conditions.

The initial thermal conductivity and diffusivity measured at 100°C were found to correlate to volatile matter of the coal. When temperatures reached thermoplastic range, the thermal conductivities and diffusivities increased rapidly with the change dependent on the fluidity of the coal.

Laboratory produced cokes exhibited a linear relationship between their strength and coke density. The properties of laboratory produced cokes, however, differed from the corresponding coke properties produced under research coke oven conditions. This is most likely because of differences in secondary reactions for the small and large-scale coking conditions. Secondary tar cracking is believed to be more pronounced in the laboratory reactor. Also, the strength test used to evaluate laboratory coke properties showed large variability for small measurement variations.

The thermal analysis data showed strong correlations with the properties of the coke produced under research coke oven conditions. The specific heat and corresponding heats of reactions of coals in the temperature range when coals undergo thermoplastic transformation were found to correspond well with the coke quality tests. A linear relationship was found between the thermoplastic range correlation (-DHv×Trough/DT)TP and the coke strength after reactivity with CO2 (CSR index) for the cokes. An empirical equation was derived from this relationship which can potentially be applied to predict CSR values using a simple thermoanalytical test.


Health and safety, productivity and environment initiatives.

Recently Completed Projects

C27052Site Trial And Demonstration Of Integrated Forward And Reverse Osmosis For Mine Water Reuse

The forward osmosis (FO) process, also known as direct osmosis, is a...

C28022Development Of A Simple Rotary Steerable System For Underground Inseam Drilling

The purpose of this project was to complete the design and testing o...

C21002Measurement And Reporting Of Fugitive Emissions From Underground Coal Mines

The National Greenhouse and Energy Reporting Act 2007 (Act), the ...


Open Cut

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

Recently Completed Projects

C28034Mining Equipment Human Factors Design For Workforce Diversity

The objectives of the project were to:

Open Cut

Coal Preparation

Maximising throughput and yield while minimising costs and emissions.

Recently Completed Projects

C27025Quantifying The Step-Change Benefit Of Reflux Flotation Cell Circuits

The objective of this project was to quantify the value proposition ...

C24047Characterisation Of Pressure (Hyperbaric) Filter Performance

Hyperbaric disc filter technology has been used to dewater fine coal...

C28058Phase Two Development Of A Low Cost Online Measurement Of Particle Size And Density For Diagnostics Across The Fine Coal Circuit (Particle Profiler)

This project is based around the development of a prototype system (...

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


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