Effect of rotors on the parameters of hop drying in belt dryers
Laen...
Kuupäev
2019
Kättesaadav alates
Autorid
Rybka, A.
Heřmánek, P.
Honzík, I.
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
This article contains a design and verification for a technical solution aimed at
optimising the hop drying process in belt dryer and at increasing the quality of the final product.
Above the first belt of our belt dryer two evenly distributed double-arm rotors were installed and
tested in operation to improve the permeability of the drying air through a flattened hop layer, as
well as to improve the speed of drying. The measurements carried out in operation and comparing
the drying process with the rotors switched on and off concluded that by inclusion of rotors the
hop layer becomes more permeable, and when switched on, the rotors have a positive effect on
faster reduction of the relative humidity and on increase of the drying air temperature. With rotors
switched on, the percentage drop in the drying air relative humidity at the third inspection window
of the first belt, compared to the first inspection window, was 41% on average (values obtained
from data loggers and fixed sensors), the drying air temperature increased by 29%, and the hop
moisture content decreased by 12%. Whereas with rotors switched off, the drop in the drying air
relative humidity was only by 26% on average, the drying air temperature increased only by 14%,
and the hop moisture content decreased by 12%. Based on long-term monitoring of fuel
consumption during the whole harvesting season starting 2011 until 2017 inclusive, the average
annual consumption of LFO (2011–2014) results in 494 L t
-1 operating without rotors, and
431 L t
-1 when operating with rotors (2015–2017). This implies that due to the implementation of
rotors, the fuel saving being 13% is significant.
Kirjeldus
Article
Märksõnad
hop cones, hop drying, belt dryer, quality of hops, articles