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Refrigeration Ensuring Reduced Down Time and Profitability

| Author / Editor: Yuvaraj Rangasamy / Dominik Stephan

During a recent retrofitting of a shrimp processing plant, the application of Danfoss ICF valve station and PMLX (Two step solenoid valve) for a hot gas defrost system led to a reduction in defrost time per batch of up to 45 minutes. It was estimated that approximately 75 per cent improvement was realized in overall productivity compared to the traditional water defrost systems.

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Danfoss compact ICF valve stations for defrost application
Danfoss compact ICF valve stations for defrost application
(Picture: Danfoss)

Ananda Seafoods, a seafood processing plant at Bhimavaram, Andhra Pradesh was founded in 1994. Over the years, increasing requirements for product quality and changing technical standards, as well as changes in market demand required them to consistently improve their equipment in order to increase their productivity. The plant used latest process equipment and freezing equipment such as the Marel IQF/Hardener.

At a Seafood Processing Plant

The installed freezing equipment at the premises had three plate freezers with a combined freezing capacity of 750 kg/hr and a straight belt Individual Quick Freezer (IQF) of capacity 500 kg/hr. They also have two hardeners run for IQF. The complete freezing equipment runs at 400C Saturated Suction Temperature (SST) and 400C Saturated Discharge Temperature (SDT) condition and the refrigerant was being supplied to the evaporators using ammonia pumped over the feed system.

The main product processed in the facility was shrimp, which was either in block form or individually frozen and exported to major countries around the globe. Other main freezing equipment in the facility included a 30 MT/day flake ice machine for producing ice for the in-process requirements, water chiller for the prechilling of the produce and freezer rooms for storing the IQF frozen products.

The Challenge: Save Time, Improve Performance

Though the process equipment was of high technological quality, key supporting processes like refrigeration, were not given due importance because of the negligence and lack of awareness on the new systems and designs.

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