Research and Education of CO{sub 2} Separation from Coal Combustion Flue Gases with Regenerable Magnesium Solutions

doi:10.2172/1132605

GSTDTAP > 地球科学

DOI	10.2172/1132605
报告编号	None
来源ID	OSTI ID: 1132605
	Research and Education of CO{sub 2} Separation from Coal Combustion Flue Gases with Regenerable Magnesium Solutions
	Lee, Joo-Youp
	2013-09-30
出版年	2013
语种	英语
国家	美国
领域	地球科学
英文摘要	A novel method using environment-friendly chemical magnesium hydroxide (Mg(OH){sub 2}) solution to capture carbon dioxide from coal-fired power plants flue gas has been studied under this project in the post-combustion control area. The project utilizes the chemistry underlying the CO{sub 2}-Mg(OH){sub 2} system and proven and well-studied mass transfer devices for high levels of CO{sub 2} removal. The major goals of this research were to select and design an appropriate absorber which can absorb greater than 90% CO{sub 2} gas with low energy costs, and to find and optimize the operating conditions for the regeneration step. During the project period, we studied the physical and chemical characteristics of the scrubbing agent, the reaction taking place in the system, development and evaluation of CO{sub 2} gas absorber, desorption mechanism, and operation and optimization of continuous operation. Both batch and continuous operations were performed to examine the effects of various parameters including liquid-to-gas ratio, residence time, lean solvent concentration, pressure drop, bed height, CO{sub 2} partial pressure, bubble size, pH, and temperature on the absorption. The dissolution of Mg(OH){sub 2} particles, formation of magnesium carbonate (MgCO{sub 3}), and vapor-liquid-solid equilibrium (VLSE) of the system were also studied. The dissolution of Mg(OH){sub 2} particles and the steady release of magnesium ions into the solution was a crucial step to maintain a level of alkalinity in the CO{sub 2} absorption process. The dissolution process was modeled using a shrinking core model, and the dissolution reaction between proton ions and Mg(OH){sub 2} particles was found to be a rate-controlling step. The intrinsic surface reaction kinetics was found to be a strong function of temperature, and its kinetic expression was obtained. The kinetics of MgCO{sub 3} formation was also studied in terms of different pH values and temperatures, and was enhanced under high pH and temperatures.
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来源平台	US Department of Energy (DOE)
引用统计
文献类型	科技报告
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/6316
专题	地球科学
推荐引用方式 GB/T 7714	Lee, Joo-Youp. Research and Education of CO{sub 2} Separation from Coal Combustion Flue Gases with Regenerable Magnesium Solutions,2013.