A new technique for real-time measurements of potassium and sodium aerosols based on field-reversal surface ionization
Artikel i vetenskaplig tidskrift, 2021

A new method for real-time measurements of potassium and sodium containing aerosol particles is described and verified. The method is based on surface ionization technique and may be used to explore the alkali chemistry related to high temperature chemistry processes. The measurement device is a further development of the simple and cost-effective surface ionization detector previously used for online alkali measurements in combustion and gasification research. The discrimination between sodium and potassium is possible due to differences in their surface desorption kinetics and facilitated by rapidly reversing the field potential between the ion source and the nearby collector. The instrument is evaluated in a series of laboratory experiments using size-selected alkali salt particles containing KCl, NaCl, K2SO4, Na2SO4, KNO3 and NaNO3. The filament temperature was found to be a key influencing factor in order to optimize the strength and Na-K deviation of the observed ion current. The ability to simultaneously report absolute concentrations of Na and K makes the instrument attractive for solid fuel conversion of alkali-rich fuels such as low-grade biomass and to explore behavior deviations of Na and K in high temperature processes.

alkali

combustion

corrosion

aerosols

ionization

Författare

Dan Gall

Göteborgs universitet

Charlotta Nejman

Göteborgs universitet

Thomas Allgurén

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik, Energiteknik 2

Klas Andersson

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Jan B. C. Pettersson

Göteborgs universitet

Measurement Science and Technology

0957-0233 (ISSN) 1361-6501 (eISSN)

Vol. 32 7 075802

Ämneskategorier

Kemiska processer

Bioenergi

Annan materialteknik

DOI

10.1088/1361-6501/abe130

Mer information

Senast uppdaterat

2021-05-25