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Title: Pilot-plant technical assessment of wet flue gas desulfurization using limestone

Abstract

An experimental study was performed on a countercurrent pilot-scale packed scrubber for wet flue gas desulfurization (FGD). The flow rate of the treated flue gas was around 300 Nm{sup 3}/h, so the pilot-plant capacity is one of the largest with respect to other published studies on a pilot-plant wet FGD. The tests were carried out at an SO{sub 2} inlet concentration of 2000 ppm by changing the recycle slurry pH to around 4.8 and the L/G ratio to between 7.5 and 15. Three types of limestone were tested, obtaining desulfurization efficiencies from 59 to 99%. We show the importance of choosing an appropriate limestone in order to get a better performance from the FGD plant. Thus, it is important to know the reactivity (on a laboratory scale) and the sorbent utilization (on a pilot-plant scale) in order to identify if a limestone is reactive enough and to compare it with another type. In addition, by using the transfer-unit concept, a function has been obtained for the desulfurization efficiency, using the L/G ratio and the recycle slurry pH as independent variables. The Ca/S molar ratio is related to these and to the SO{sub 2} removal efficiency. This function, together with amore » simplified function of the operation variable cost, allows us to determine the pair (L/G ratio and pH) to achieve the desired SO{sub 2} removal with the minimum operation cost. Finally, the variable operation costs between packed towers and spray scrubbers have been compared, using as a basis the pilot packed tower and the industrial spray column at the Compostilla Power Station's FGD plant (in Leon, Spain).« less

Authors:
; ; ; ; ;  [1]
  1. University of Seville, Seville (Spain)
Publication Date:
OSTI Identifier:
20727617
Resource Type:
Journal Article
Resource Relation:
Journal Name: Industrial and Engineering Chemistry Research; Journal Volume: 45; Journal Issue: 4
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; PILOT PLANTS; SCRUBBERS; DESULFURIZATION; FLUE GAS; LIMESTONE; LIME-LIMESTONE WET SCRUBBING PROCESSES; REACTIVITY; COMPARATIVE EVALUATIONS

Citation Formats

Ortiz, F.J.G., Vidal, F., Ollero, P., Salvador, L., Cortes, V., and Gimenez, A. Pilot-plant technical assessment of wet flue gas desulfurization using limestone. United States: N. p., 2006. Web. doi:10.1021/ie051316o.
Ortiz, F.J.G., Vidal, F., Ollero, P., Salvador, L., Cortes, V., & Gimenez, A. Pilot-plant technical assessment of wet flue gas desulfurization using limestone. United States. doi:10.1021/ie051316o.
Ortiz, F.J.G., Vidal, F., Ollero, P., Salvador, L., Cortes, V., and Gimenez, A. Wed . "Pilot-plant technical assessment of wet flue gas desulfurization using limestone". United States. doi:10.1021/ie051316o.
@article{osti_20727617,
title = {Pilot-plant technical assessment of wet flue gas desulfurization using limestone},
author = {Ortiz, F.J.G. and Vidal, F. and Ollero, P. and Salvador, L. and Cortes, V. and Gimenez, A.},
abstractNote = {An experimental study was performed on a countercurrent pilot-scale packed scrubber for wet flue gas desulfurization (FGD). The flow rate of the treated flue gas was around 300 Nm{sup 3}/h, so the pilot-plant capacity is one of the largest with respect to other published studies on a pilot-plant wet FGD. The tests were carried out at an SO{sub 2} inlet concentration of 2000 ppm by changing the recycle slurry pH to around 4.8 and the L/G ratio to between 7.5 and 15. Three types of limestone were tested, obtaining desulfurization efficiencies from 59 to 99%. We show the importance of choosing an appropriate limestone in order to get a better performance from the FGD plant. Thus, it is important to know the reactivity (on a laboratory scale) and the sorbent utilization (on a pilot-plant scale) in order to identify if a limestone is reactive enough and to compare it with another type. In addition, by using the transfer-unit concept, a function has been obtained for the desulfurization efficiency, using the L/G ratio and the recycle slurry pH as independent variables. The Ca/S molar ratio is related to these and to the SO{sub 2} removal efficiency. This function, together with a simplified function of the operation variable cost, allows us to determine the pair (L/G ratio and pH) to achieve the desired SO{sub 2} removal with the minimum operation cost. Finally, the variable operation costs between packed towers and spray scrubbers have been compared, using as a basis the pilot packed tower and the industrial spray column at the Compostilla Power Station's FGD plant (in Leon, Spain).},
doi = {10.1021/ie051316o},
journal = {Industrial and Engineering Chemistry Research},
number = 4,
volume = 45,
place = {United States},
year = {Wed Feb 15 00:00:00 EST 2006},
month = {Wed Feb 15 00:00:00 EST 2006}
}