2004, Volume 6, Issue 7
Strategic Study of CAE >> 2004, Volume 6, Issue 7
Methane Nonflame Combustion in Molten Salt Using CuO Catalyst
Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology,Kunming 650093, China
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Abstract
A nonflame combustion technology using thermal cyclic carrier of molten salt introduced in this paper is developed based on the knowledge of energy chemistry, fuel cell and combustion. In this technology, a whole combustion is divided into two steps, i. e. section of producing oxide and section of combustion. In the first step, oxygen is separated form air, and pure N<sub>2</sub> is simultaneously left which is easily recovered. In the other step, fuels react with oxides formed in the first step, and at the same time, thermal energy, CO<sub>2</sub> and H<sub>2</sub>O are produced. The CO<sub>2</sub> is easily separated from water vapour and captured. There are theoretically no environmentally-unfriendly gases such as CO<sub>2</sub>，NO<sub>x</sub> and S0<sub>2</sub> discharged in the whole combustion process. A typical nonflame combustion system using Li<sub>2</sub>CO<sub>3</sub> + K<sub>2</sub>CO<sub>3</sub> + Na<sub>2</sub>SO<sub>4</sub> as molten salt system, CH<sub>4</sub> as fuel, CuO as catalyst was experimentally investigated. Experimental results show that the combustion process proceeded as theoretically analyzed, and high concentration CO<sub>2</sub> of 77.0%〜95.0% and N<sub>2</sub> of 91.9%〜99.<sub>3</sub>% were obtained. The high concentration of CO<sub>2</sub> is favorable for capturing and storing subsequently. So, the potential of reducing CO<sub>2</sub> emissions of this nonflame combustion technology is huge.
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