ACARP ACARP ACARP ACARP
Underground

Reducing Diesel Particulate Matter in Underground Mines by Optimising Design and Operation of Diesel Exhaust Systems

Underground » Health and Safety

Published: December 15Project Number: C23013

Get ReportAuthor: Varun Rao, Daya Dayawansa, and Damon Honnery | Monash University

Control of diesel particulate matter (DPM) in the underground coal mine environment is most often achieved by use of diesel particulate filters (DPFs). Although they are generally effective at filtering DPM, DPFs have been plagued by poor service life, resulting in costly and ineffective control of DPM. The MTI-Monash University team has been working on short-term and medium-term solutions to this problem through two ACARP projects as part of an overall DPM reduction roadmap for underground coal mines.

 

A previous project, ACARP C21017, identified water carry-over from the water scrubber component of the diesel exhaust system (DES) as the dominant cause of poor filter life. Results from the investigation showed that filters from Freudenberg Filtration Technologies (FFT) could be dried and re-used without compromising filter performance or integrity. Although this solution is inexpensive and simple to implement, a far better solution would be to achieve an extension of filter life without the need for removal and drying. There are two complementary approaches to achieve this increase in filter life: (i) modifying the DES to reduce the water carry-over, and (ii) modifying DPFs so that they are less affected by water. Both these approaches were investigated in the current project.

 

Water transport from the scrubber could be in the form of liquid droplets due to aerodynamic processes or water vapour through an evaporative process, requiring correspondingly different ways to mitigate the problem. Results from experimental investigations and theoretical modelling of the DES show the following:

· The main reason for excessive water transport from the scrubber is water evaporation, not droplets due to aerodynamic processes;

· Water retention in the filter canister is due to a temperature drop across the canister resulting in water condensation.

· Water condensation in the filter canister could be resolved by modifying the temperature distribution of the exhaust as it passes through the DES;

· Some modifications to modify the temperature distribution of the DES were trialled in this project and showed a significant reduction in water transport from the scrubber;

· Further work will be required to redesign the DES to achieve this outcome in a practical and safe manner;

· A diagnostic method using the ion current signal could indicate excessive DPM emissions.

 

There have been recent developments in new filter models available to mine sites since the initial MTI-Monash ACARP project, including the use of fibreglass filters supplied by Global Mining Supplies (GMS) that were anecdotally less affected by water, and Cosway C100a filters supplied by UnderGround Mining (UGM). The main drawbacks of the former were the relatively poor filtration efficiency for the greening-in period, and also concerns about the possibility of fibreglass particles being ejected from the medium. The filtration efficiency of the latter filters was not investigated in previous projects. In addition to these filters, Freudenberg Filtration Technologies (FFT) have also recently released improved long-life filters.

 

The MTI-Monash University team has developed a comprehensive roadmap for DPM reduction in underground coal mines. In the immediate short-term, results from ACARP projects C21017 and the current investigation have already offered savings to mine operators by increasing DPF life. As a result of the previous ACARP project, C21017, mine sites that operate FFT filters can re-use them up to 5 times by intermittent drying without compromising filter efficiency or integrity. The current project has also provided an assessment of the filtration performance of experimental long-life FFT filters, data that is crucial to the real-world reduction in ambient DPM from use of these filters. For mine sites where GMS filters are used, the current project has presented a detailed set of test results for filtration efficiency and service life, as well as an investigation of the likelihood of ejection of fibreglass particles from the filter medium. Mine sites that use Cosway C100a filters will be benefited by the experimental results of initial filtration efficiency.

 

Long term improvements can be achieved through a redesign of the DES, or through better diagnostic tools for measurement of DPM. Both these options are discussed in this report and are proposed as future work.

 

The three significant outcomes of this project are:

· Water vapour from evaporation in the scrubber has been identified as the dominant mechanism of water transport into the filter canister. Condensation of the water vapour occurs in the filter canister due to heat loss;

· A modification to prevent water condensation in the filter canister was trialled and has the potential to greatly increase filter service life; and

· A modified fibreglass diesel particulate filter with a high initial filtration efficiency and a long term filtration efficiency comparable to the polypropylene filters commonly used by mine sites was developed.

 

Underground

Health and safety, productivity and environment initiatives.

Recently Completed Projects

C26059Proof Of Concept Of The Electronic Spark Test Apparatus On Existing Known Power Supplies

This project continued a long running research program into an elect...

C26070Industrialisation Of Proof Of Concept Wall-Flow DOC + Filter System

The need to protect workers from diesel particulate matter (DPM) had...

C25001Ventilation And Gas Management - Underground Coal Mines

This planning guideline has been prepared to assist mine operators t...

Underground

Open Cut

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

Recently Completed Projects

C26034Coking Properties Deterioration In Small Samples

Accurate evaluation of coking coal parameters at the exploration sta...

C23029Alternative And Sustainable Explosive Formulations To Eliminate Nitrogen Oxide Emissions

This technical report describes the technology of a novel mining exp...

C25005Site Based Trials Of Alternative Explosive Formulations To Eliminate Nitrogen Oxide Emissions

This report documents the outcomes of Phase 3 of this project and b...

Open Cut

Coal Preparation

Maximising throughput and yield while minimising costs and emissions.

Recently Completed Projects

C26009Improved Precision Of Determining Coal In Urban Dust

Dust samples collected in coastal locations using High Volume Air Sa...

C26015Novel Characterisation Of Coal Petrography For Improving The Dewatering Of Fine Coals Using Chemicals

This project aimed to develop alternatives to existing mechanical de...

C26014Low Cost Online Measurement Of Particle Size And Density For Diagnostics Across The Fine Coal Circuit

This project has developed a novel prototype optical system for prof...

Coal Preparation

Technical Market Support

Market acceptance and emphasising the advantages of Australian coals.

Recently Completed Projects

C26045Mineralogy Effects On The 3D Porosity Evolution Of Coke And Coke Reactivity

CRI/CSR CO2 combustion data are key metrics of coke quality and perf...

C25049Fusibility Of Coal Blends And Minerals In Coking

The CSIRO optical reflected light imaging CGA (Coal Grain Analysis) ...

C25045Stage Two - Assessment Of In Situ High-Temperature Strength Of Cokes

Stage I of this project established a reliable and repeatable proces...

Technical Market Support

Mine Site Greenhouse Gas Mitigation

Mitigating greenhouse gas emissions from the production of coal.

Recently Completed Projects

C27058Technological Assessment Of A Recycle Reactor For VAM Abatement

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

C27008Selective Absorption Of Methane By Ionic Liquids

The connection of a ventilation air methane (VAM) abatement plant di...

C24061Proof-Of-Concept Photocatalytic Destruction Of Methane For Coal Mining Fugitive Emissions Abatement

Australia's fugitive emissions in 2015 were 41 Mt CO2-e (representin...

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