Mine Site Greenhouse Mitigation » Mine Site Greenhouse Mitigation
This multi-phase project is concerned with the mitigation of mine site greenhouse gases (GHG) and specifically focuses on the development and demonstration of a novel stone dust looping (SDL) process for the abatement of ventilation air methane (VAM). The relevant research and development activities are grouped into a multi-phase program of study comprising:
· Phase-I (previously reported) - Examination of the performance characteristics of a laboratory-scale proof of concept SDL prototype under controlled settings;
· Phase-II (this report) - Mine site process integration and bench scale demonstration;
· Phase-III - Demonstration of concept in 1 m3/s plant at the University of Newcastle;
· Phase-IV - Process design, scale-up and economic assessment; and
· Phase-V - Pilot-scale demonstration.
While each phase of the proposed study is the subject of a separate project, they are complementary. However, the overall program is stage-gated and, hence, commencement of each phase is subjected to successful completion of prior phases.
SDL is the only VAM abatement process being developed by an Australian University which provides a near zero emission mining option. SDL process development has positioned Australia in the forefront for the development of innovative zero emission VAM abatement technology.
The work plan included comprehensive experimental and modelling work. The optimum SDL process conditions were evaluated in a Fluidised Bed Reactor. Also, further improvement in the stability of stone dust with different additives was studied, as well as the effects of moisture and coal dust on stability. Extensive testing and experimentation was carried out on the prototype 10 l/min SDL plant, with over 150 hours of operation logged. Detailed process simulations were carried out to investigate the feasibility of the SDL process, specifically to quantify the energy footprint and identify the self-sustainability of the SDL process. Comparison of the SDL process has also been made with TFRR. Finally an empirical model was developed to assist with reactor design and allow for the prediction of a number of operating parameters in a continuous system utilising the inherent kinetic parameters derived from single fluidised bed experiments.
The key outcomes of Phase II include:
· Identification of the optimum operating conditions for SDL process;
· Identification of the stone dust tolerance limit for moisture and coal dust;
· Enhancement in the cyclic stability of the stone dust material;
· Demonstration of SDL process for 150 hours of operation; and
· Process modelling and reactor design studies.