A1 Journal article (refereed), original research

Specific energy consumption of vacuum filtration: Experimental evaluation using a pilot-scale horizontal belt filter


Open Access publication

Publication Details
Authors: Huttunen Manu, Nygren Lauri, Kinnarinen Teemu, Ekberg Bjarne, Lindh Tuomo, Ahola Jero, Karvonen Vesa, Häkkinen Antti
Publisher: Taylor & Francis: STM, Behavioural Science and Public Health Titles
Publication year: 2019
Language: English
Related Journal or Series Information: Drying Technology
ISSN: 0737-3937
JUFO-Level of this publication: 1
Open Access: Open Access publication
Location of the parallel saved publication: http://urn.fi/URN:NBN:fi-fe2019110536722

Abstract

Horizontal vacuum belt filters are used for continuous solid–liquid
separation in a wide variety of industrial processes. Despite the low
pressure difference (usually Δp < 0.8 bar), the high air
pumping requirement to maintain the pressure difference results in
considerable energy consumption. In this article, the specific energy
consumption of vacuum filtration and air flow rates of a pilot-scale
horizontal vacuum belt filter unit are investigated. The results show
that a claw-type vacuum pump consumes only half the energy compared to a
conventional liquid ring vacuum pump at corresponding operating points.
A comparison between the specific energy consumption of vacuum
filtration and thermal drying of the filter cake to zero moisture
revealed that vacuum filtration accounted for less than half of the
total energy consumption in the applied experimental conditions at Δp = 0.2–0.5 bar.
The majority of the total pumping requirement of the pilot-scale filter
resulted from leaks, and only 2–25% of the air flow found its way
through the cake and the filter medium. The results suggest that there
is a combination of the pressure difference level and the mass of solids
deposited per filtration area that together with thermal drying
consumes the least amount of energy per solids mass.


Last updated on 2020-20-03 at 10:03