Hurricane cyclones to Maximize Milk Proteins Recovery from a Multi stage spray dryer at Arla Foods (92 140m3/h at 65ºC) - case study

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Courtesy of Advanced Cyclone Systems, S. A.

FOREWORD
Advanced Cyclone Systems, S.A. (ACS) designed and supplied a Hurricane Cyclone System to maximize milk proteins recovery from a multi stage (MSD) Niro spray dryer for Aria Foods in Holstebro, Denmark.

Aria Foods is a global dairy company and a co-operative owned by dairy farmers, with production facilities in 13 countries and addicional sales offices in 20 more countries, with a total of more than 19,000 employees. Products are sold under the well-known brands Aria®, Lurpak& and Castello3 in over 100 countries. The net turnover in 2011 was DKK64 billion (including turnover from MUH and Milk Link), with 12 billion kg milk sold.

IDENTIFYING THE PROBLEM AND SOLUTION
The existing cyclones installed on the MSD Spray Dryer 3 (SD3) provided a 96.9% capture efficiency (emissions of about 500mg/ Nm3), The remaining product (emissions from existing cyclones) was being lost, captured in a wet scrubber installed downstream. Total annual losses reached 320 tons of caseinate per year, estimated in several millions of Euros.

In order to design the most efficient system for this case, a dust sample was collected from the existing cyclones and measured in a laser sizer to obtain the Particle Size Distribution (PSD). With the information of the recovery rate of the existing cyclones and of the current emissions, ACS could reconstruct the PSD and solids concentration (in mg/Nm3) at the exit of the dryer (Fig. 1).

ACS further analysed the case and confirmed that the separation efficiency could be increased with two new numerically optimized cyclones (hurricanes). ACS efficiency model predicted a global col lection efficiency of approximately 98.9-99.27% for the hurricanes, at the same operating conditions and pressure drop.

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