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Biofuels and Biomass
Investigation of the collection efficiency of a Wet Electrostatic Precipitator at a Municipal Solid Waste-Fuelled Combined Heat and Power Plant, using various measuring methods Jens Pettersson, Sven Andersson, Linda Bäfver, and Michael Strand Energy Fuels, Just Accepted Manuscript • DOI: 10.1021/acs.energyfuels.9b00373 • Publication Date (Web): 22 Apr 2019 Downloaded from http://pubs.acs.org on April 23, 2019
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Energy & Fuels
Investigation of the collection efficiency of a Wet Electrostatic Precipitator at a Municipal Solid WasteFuelled Combined Heat and Power Plant, using various measuring methods Jens Pettersson,a,* Sven Andersson,b Linda Bäfver,c and Michael Stranda
aLinnaeus
University, SE-351 95 Växjö, Sweden
bBabcock
& Wilcox Vølund AB Anders Carlsson gata 14, SE-402 72 Göteborg, Sweden
Division Energy and Materials, Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96, Göteborg, Sweden cSP
Sveriges Tekniska Forskningsinstitut, Box 857, SE-501 15 Borås, Sweden
ABSTRACT
This article reports results from measurements of mainly submicron particles at the inlet and outlet of a newly designed industrial wet electrostatic precipitator (WESP) in a combined heat and power plant fuelled with municipal solid waste. The measurements were carried out with dual electric low-pressure impactors in parallel at the precipitator inlet and outlet. In addition, measurements were carried out with traditional total dust filters, low-pressure impactors, a scanning mobility particle sizer, and an aerodynamic particle sizer. The measurements aimed to characterize the aerosol particles and measure the efficiency of the WESP with special attention to fine and ultrafine particles. In general, the WESP performance and response to varying conditions were found to be in line with predictions made for the ACS Paragon Plus Environment
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design. The WESP featured a cooled collector surface, but, based on the limited results, no conclusion could be made regarding any possible improvement from the collector cooling. The characterization of the aerosol particulate matter was challenging, due to fast fluctuations in particle concentration. Methodological considerations are pointed out, mainly regarding the SMPS and ELPI measuring systems.
Introduction Industrial society creates a considerable amount of waste, which should preferably be recycled for further use to promote sustainability. Similarly, the energy needed to meet a sustainable society’s needs should preferably be supplied from renewable energy resources. Consequently, some municipal solid waste (MSW) is recovered as energy, through combustion in municipal solid waste incineration (MSWI) plants. About 20%, approximately 60 million tonnes per year, of the MSW within the European Union is currently recovered through combustion in MSWI plants1. Today, waste incineration represents a mature and robust technology for energy recovery from MSW, and can be considered an essential part of a sustainable waste management system.2-5 A considerable portion of MSW is biomass,6 while the remainder is a mixture of different origins. During combustion, environmentally hazardous and toxic substances may be released from the furnace. Efficient emission abatement is thus necessary to protect the environment and human health. Over the years, air pollution control devices have been successively developed to reduce emissions of gaseous as well as particulate matter. Nowadays, many MSWIs are equipped with wet scrubbers, fabric filters, and electrostatic precipitators (ESPs). Traditionally, particle emissions have been measured using gravimetric methods, and considerable attention has been paid to the total mass of the dust emitted. Fabric filters and ESPs are effective at decreasing the content of particulate matter in the flue gas, when considering the total mass; however, fine (
