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

Manu Huttunen, Lauri Nygren, Teemu Kinnarinen, Bjarne Ekberg, Tuomo Lindh, Jero Ahola, Vesa Karvonen, Antti Häkkinen

Research output: Contribution to journalArticleScientificpeer-review

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.

Original languageEnglish
JournalDrying Technology
DOIs
Publication statusE-pub ahead of print - 7 Mar 2019
MoE publication typeA1 Journal article-refereed

Fingerprint

energy consumption
Energy utilization
Vacuum
filters
vacuum
evaluation
vacuum pumps
Vacuum pumps
air flow
drying
Drying
pumping
Air
Filters (for fluids)
requirements
moisture
Moisture
low pressure
flow velocity
Flow rate

Keywords

  • cake dewatering
  • energy conservation
  • horizontal vacuum belt filter
  • specific energy consumption
  • thermal drying
  • vacuum filtration

Cite this

Huttunen, Manu ; Nygren, Lauri ; Kinnarinen, Teemu ; Ekberg, Bjarne ; Lindh, Tuomo ; Ahola, Jero ; Karvonen, Vesa ; Häkkinen, Antti. / Specific energy consumption of vacuum filtration : Experimental evaluation using a pilot-scale horizontal belt filter. In: Drying Technology. 2019.
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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.",
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Specific energy consumption of vacuum filtration : Experimental evaluation using a pilot-scale horizontal belt filter. / Huttunen, Manu; Nygren, Lauri; Kinnarinen, Teemu; Ekberg, Bjarne; Lindh, Tuomo; Ahola, Jero; Karvonen, Vesa; Häkkinen, Antti.

In: Drying Technology, 07.03.2019.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Huttunen, Manu

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AU - Lindh, Tuomo

AU - Ahola, Jero

AU - Karvonen, Vesa

AU - Häkkinen, Antti

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N2 - 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.

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