Case story VLT® control pays back in two years controlling ammonium screw compressor Monthly savings were USD 1,155, ensuring recovery of investment on the Danfoss frequency converter within two years, when Bimbo applied a VLT® frequency converter control to an ammonium cooling compressor. Now their successful experience is becoming standard in other Bimbo plants. Founded in Mexico, in 1945, Bimbo Group is currently one of the most important baking companies in the world, in terms of production capacity or sales volume, in addition to being the absolute leader in Mexico and Latin America. Present in 18 countries, in America, Europe and Asia, and with massive growth in China, Bimbo brings to the market approximately 5,000 products and 100 well-known trade marks. Its net sales in 2007 were over $7 billion USD. Knowing the demand The traditional control method for screw compressors is using a slip valve, due to its outstanding functionality and low cost. A slip valve is basically a valve that regulates the gas flow, maintaining the compressor suction pressure. However, using a frequency converter to control the speed Screw Compressor 300 hp CT7 The company has used and trusted Danfoss products for a long time. Recently, Bimbo selected the Hazpan plant and granted Danfoss authorization to implement an energy saving system on one of its ammonia compressors. In this case, a 200kW CT7 Frick screw compressor, which represented an excellent opportunity for energy savings, due to the large number of compressor units installed in Bimbo plants, and owing to their requirements for motors. is becoming more and more common. The compressor’s energy consumption can be optimised and the compressor capacity will vary proportionally to the speed. Although the frequency converter solution requires a larger initial investment, it is definitely the most effective solution in the long term, given that the most important issue to be taken into account is the saving gained in daily operation. What really matters is analysing the system demand profile. Although the CT7 Frick compressor works for long hours, power consumption never reaches close to 100 % load.
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