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In this work a series of carbon adsorbents were prepared from a low-cost biomass residue, olive stones. Two different approaches were studied: activation with CO 2 and heat treatment with gaseous ammonia. The results showed that both methods are suitable for the production of adsorbents with a high CO 2 adsorption capacity, and their potential application in VSA or TSA systems for...
Oxy-fuel combustion is a GHG abatement technology in which coal is burned using a mixture of oxygen and recycled flue gas, to obtain a rich stream of CO 2 ready for sequestration. An entrained flow reactor was used in this work to study the ignition and burnout of coals and blends with biomass under oxy-fuel conditions. Mixtures of CO 2 /O 2 of different concentrations were...
Ignition tests were carried out on blends of three coals of different rank – subbituminous, high volatile and low volatile bituminous – in two entrained flow reactors. The ignition temperatures were determined from the gas evolution profiles (CO, CO 2 , NO, O 2 ), while the mechanism of ignition was elucidated from these profiles and corroborated by high-speed video recording. Under...
Coal blends are now widely used by the power generation industry and the general characteristics are well known. Attention is still directed to the emission of NO x , which is subject to more stringent regulation, and to the amount of carbon in ash. The latter is increased when low NO x burners are employed, which is the norm now. It is also increased as a result of additional air...
The increasing environmental concern caused by the use of fossil fuels and the concomitant need for improved combustion efficiency is leading to the development of new coal cleaning and utilisation processes. However, the benefits achieved by the removal of most mineral matter from coal either by physical or chemical methods can be annulled if poor coal combustibility characteristics are attained...
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