Pilot-Plant Technical Assessment of Wet Flue Gas Desulfurization Using Limestone

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• 作者：F. J. Guti&eacute ; rrez Ortiz ; F. Vidal ; P. Ollero ; L. Salvador ; V. Cort&eacute ; s ; and A. Gim&eacute ; nez
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2006
• 出版时间：February 15, 2006
• 年：2006
• 卷：45
• 期：4
• 页码：1466 - 1477
• 全文大小：662K
• 年卷期：v.45,no.4(February 15, 2006)
• ISSN：1520-5045

文摘

An experimental study was performed on a countercurrent pilot-scale packed scrubber for wet flue gasdesulfurization (FGD). The flow rate of the treated flue gas was around 300 Nm³/h, so the pilot-plant capacityis one of the largest with respect to other published studies on a pilot-plant wet FGD. The tests were carriedout at an SO₂ inlet concentration of 2000 ppm by changing the recycle slurry pH to around 4.8 and the L/Gratio to between 7.5 and 15. Three types of limestone were tested, obtaining desulfurization efficiencies from59 to 99%. We show the importance of choosing an appropriate limestone in order to get a better performancefrom the FGD plant. Thus, it is important to know the reactivity (on a laboratory scale) and the sorbentutilization (on a pilot-plant scale) in order to identify if a limestone is reactive enough and to compare it withanother type. In addition, by using the transfer-unit concept, a function has been obtained for the desulfurizationefficiency, using the L/G ratio and the recycle slurry pH as independent variables. The Ca/S molar ratio isrelated to these and to the SO₂ removal efficiency. This function, together with a simplified function of theoperation variable cost, allows us to determine the pair (L/G ratio and pH) to achieve the desired SO₂ removalwith the minimum operation cost. Finally, the variable operation costs between packed towers and sprayscrubbers have been compared, using as a basis the pilot packed tower and the industrial spray column at theCompostilla Power Station's FGD plant (in León, Spain).