Module-based simulation model for prediction of convective and condensational heat recovery in a centrifugal wet scrubber

Johansson, Wanja and Li, Jun and Lin, Leteng (2023) Module-based simulation model for prediction of convective and condensational heat recovery in a centrifugal wet scrubber. Applied Thermal Engineering, 219 (Part A). 119454. ISSN 1359-4311 (https://doi.org/10.1016/j.applthermaleng.2022.1194...)

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Abstract

Biomass combustion is a carbon–neutral method to generate heat and power and is integral to combating climate change. The wet scrubber is a promising device for recovering heat and reducing particle emissions from flue gas, under the driving force of new European Union legislation. Here, the heat recovery of a wet scrubber was investigated using process data and computer simulations. The process data showed that the scrubber could continuously recover heat corresponding to 10–20% of the energy input. The simulation model consists of two interlinked modules: Module 1 simulates droplet movement in the scrubber, while Module 2 uses the output of Module 1 to predict the heat recovery. The model was validated against process data, showing a mean error of 5.6%. Further optimization was based on the validated model by varying different process parameters, including nozzle position and moisture addition to the flue gas. Moisture addition was shown to be a feasible strategy for potentially increasing heat recovery by up to 3.3%. These results indicate that heat recovery in wet scrubbers is a feasible way to make particle removal cost effective in medium-scale combustion facilities, and that the developed simulation model can play an important role in optimizing these processes.

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