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Technical Briefs

Experimental Study on a Medium Consistency Pump

[+] Author and Article Information
X. D. Ma

e-mail: maxudan@zju.edu.cn

Z. F. Li

e-mail: andycas@zju.edu.cn
Institute of Process Equipment,
Zhejiang University,
38 Zheda Road, Hangzhou 310027, China

H. Yu

Light Industry Hangzhou Electromechanical Design Institute,
72 Tiyuchang Road, Hangzhou 310000, China
e-mail: hongyu_hz@126.com

D. Z. Wu

e-mail: wudazhuan@zju.edu.cn

L. Q. Wang

e-mail: hj_wlq2@zju.edu.cn
Institute of Process Equipment,
Zhejiang University,
38 Zheda Road, Hangzhou 310027, China

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the Journal of Fluids Engineering. Manuscript received March 12, 2013; final manuscript received June 14, 2013; published online August 6, 2013. Assoc. Editor: Bart van Esch.

J. Fluids Eng 135(10), 104503 (Aug 06, 2013) (5 pages) Paper No: FE-13-1152; doi: 10.1115/1.4024865 History: Received March 12, 2013; Revised June 14, 2013

An experimental testing rig is built to study the performance of a centrifugal pump used in medium consistency technology (MC technology). Pump performances are tested in different pulp concentration, degas pressure differential, and tip clearance ratio. The results show that in medium concentration, pump head and efficiency decreases with increase of pulp concentration. There is a critical concentration above which pump performance drops. Gas separation effect is influenced by the pressure differential over the degas system and the air content in the pulp suspension. In high concentration and small tip clearance conditions, friction loss increases a great deal and results in an efficiency reduction.

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Figures

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Fig. 6

Pump performance in different vacuum pressure (B = 18 mm, C = 3 mm, n = 2372 rpm). (a) Cm = 12.43% and (b) Cm = 11.76%.

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Fig. 5

Pump performance in different tip clearance ratio (B = 21 mm, Q = 56 m3/h). (a) n = 2075.5 rpm (b) n = 2372 rpm, and (c) n = 2570 rpm.

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Fig. 4

Pump performance in different tip clearance ratio (B = 18 mm, Q = 56 m3/h). (a) n = 2075.5 rpm (b) n = 2372 rpm, and (c) n = 2570 rpm.

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Fig. 3

Pump performance in different concentrations (C = 5 mm, PV = −0.012 MPa). (a) B = 18 mm, n = 2075.5 rpm (b) B = 21 mm, and n = 2520 rpm.

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Fig. 2

Structure of the MC pump and the degas system

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Fig. 1

A schematic view of experimental set up

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Fig. 7

Flow conditions in the vacuum outlet pipe under different pressure differentials. (a) Appropriate degas pressure differential and (b) large degas pressure differential.

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