Technology Optimization of Wet Flue Gas Desulfurization Process

Abstract

Optimization of the wet limestone (calcite) flue gas desulfurization (FGD) process is described, with the focus on the layout of subprocesses and equipment. The aim of optimization was to check the effectiveness and reliability of alternative layouts, involving intermediate product (gypsum) storage in the absorber make-up tank, instant production of limestone slurry from powder in a wet screw conveyer and automatic gypsum dewatering line operation. Three alternatives, standard layout, optimized layout and optimized layout without reheating of treated gas, were designed and tested in a small industrial FGD plant. The comparison included evaluation of desulfurization efficiency, economical feasibility (considering a 125 MW power plant) and reliability of operation. The efficiency of the system was not affected by the layouts. Investment costs were reduced by 5 and 15 % for alternatives 1 and 2, respectively, compared to standard offers on the market. With respect to operating costs, variable operating and maintenance costs could be decreased by 0.5 up to 2.5 %, respectively. As shown by risk and reliability analysis, the availability of the system in both alternative layouts remained unchanged or was better with regard to the standard layout.

SO2 removal from simulated flue gas using various aqueous solutions: Absorption equilibria and operational data in a packed column

“…From the economic point of view, in the packed column liquid-gas volumetric flow ratio (L/G) is the effective parameter for evaluating absorption performance [40]. This factor affects on the absorption rate through the liquid film thickness and could have influence on mass transfer coefficient of gas phase.…”

Flue gas desulphurization based on limestone-gypsum with a novel wet-type PCF device

“…From the economic point of view, the liquid-gas ratio, V L /V G , has been found to be one of the most important criterions for reporting the absorber performance [22]. In practical FGD processes, the V L /V G value can be calculated according to its minimum value, Fig.…”

Economic evaluation for air pollution control technologies selection in power plants processes

“…This control technology offers the highest removal efficiency (90-98 %) (Cooper and Alley, 2002) and is the preferred technology for coal-fired electric utility power plants (USEPA, 2003a). For the prevention and control of NO X a combination of combustion modifications and flue gas treatment (FGT) can be used (European IPPC Bureau, 2005;Hrastel et al, 2007). Low-NO X burners were selected as the combustion modification to be used.…”