题目：CSIRO R & D on Carbon Composite Adsorbents for CO₂ Capture, and Ventilation Air Methane Mitigation and Utilisation

报告人：Dr. Yonggang Jin
            Commonwealth Scientific and Industrial Research Organisation (CSIRO), 
            Energy Flagship, Environmental Science and Engineering Team

时间：4月11日（周五）10:00-10:45

地点：李薰楼468会议室

CSIRO R & D on Carbon Composite Adsorbents for CO₂ Capture, and Ventilation Air Methane Mitigation and Utilisation

Greenhouse gas (GHG) emissions from coal production and use such as fugitive CH4 emissions from coal mining and CO₂ emissions from coal-fired power stations have become a main contributor to the global GHG emissions. It is important to develop efficient and cost-effective technologies for CO₂ and CH₄ emissions abatement so as to continue using coal as a most accessible energy resource. This talk will give an overview of the research work carried out at CSIRO Environmental Science and Engineering Team in the areas of CO₂ post-combustion capture and ventilation air methane (VAM) mitigation and utilisation.

To date, CSIRO has a comprehensive research program on post combustion CO₂ capture including solvent processes and solid adsorbents. For this program our team mainly develops carbon composite adsorbents for CO₂ capture in a dry process from laboratory-scale studies to site trials and demonstration of a small pilot-scale novel CO₂ capture prototype unit. We have fabricated and characterised several series of carbon composites incorporated with carbon fibres, carbon nanotubes, and macadamia nut shell-derived carbons. These composites possess a hierarchical macroporous-microporous structure, exhibiting superior CO₂ adsorption capacity and kinetics, and excellent CO₂/N₂ selectivity compared to conventional activated carbons. Our novel honeycomb carbon fibre composites were tested for CO₂ adsorption and desorption performance with a simulated flue gas (13 vol% CO₂ and 5.5 vol% O₂ with balanced N₂) in a small pilot-scale prototype unit with two capture columns of 2 m high. At present, the prototype unit is being trialled with the actual flue gas at a power station in Australia.

VAM represents the largest proportion of methane emissions from coal mines. Developing an effective technology for VAM mitigation or utilisation as an energy source has been an on-going challenge because the volume flow rate of ventilation air is large and the concentration of methane is dilute and variable. A typical gassy mine in Australia produces ventilation air at a rate of approximately 150 to 600 m³/s with a methane concentration of 0.3-1 vol%. Since 2000, CSIRO has conducted comprehensive studies from site characterisation, theoretic studies and laboratory-scale experiments, to development and site trials of VAM prototype units through more than 22 research projects. Three CSIRO VAM technologies have been developed including VAM catalytic combustion gas turbine (VAMCAT) for power generation, VAM capture (VAMCAP) using carbon fibre composite adsorbents, and novel VAM mitigator (VAMMIT) based on a reverse flow reactor with a newly structured regeneration bed. A 25 kWe VAMCAT prototype unit has been developed and tested at a coal mine site. The prototype units of VAMCAP and VAMMIT have also been built and tested in our laboratory and are ready for coal mine site trials.

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