Delta Screw now even more energy efficient
AERZEN E-Compressor
AERZEN presents for the first time the completely revised compressor packages at the PowTech in Nuremberg from 30th September to 1st October 2014. These compressor packages belong to series Delta Screw E design which work even more energy efficiently than previous designs.
This new series of E compressors includes four sizes in the volume flow range from 900 to 6,700 m3 per second and drive capacities from 55 to 630 kilowatts. The single stage, oil-free screw (type) compressors are being offered with 2.0 bar and 3.5 bar differential pressure. Energy savings of up to 6% can be achieved, depending on the pressure ratio or the volume flow - which represents impressive performance in this category. Further revised types of the Delta Screw series will follow, step-by-step.
Constructive optimisations
The energy-saving improvements are the result of many constructive optimisations. Instead of suctioning the air to be com- pressed from inside the acoustic hood, cooler outside air is now sent through an intake channel directly to the intake filter. This improves the specific performance of the plant considerably. In addition, optimised inflow channels and an innovative pressure-side silencer with improved fluid dynamics and no absorption materials, help minimise pressure loss significantly. They are the results of a considerable amount of research by AERZEN’s development team. The silencer output has been reduced to less than 80 dB(A). Moreover, by using two compensators, the system is also 100 per cent stress-free. In future, this discharge side silencer will also be designed as a spark arrester according to ATEX Directive 137 for explosion proof plants (EU Directive 1999/92/EC).
Up to now, the fan for cooling the interior of the acoustic hood was positioned on the compressor shaft. From now on, the fan will be equipped with a separate electric motor. As a result, it can be made in a smaller size, positioned particularly efficiently, be controlled temperature-dependently, if necessary be operated in run-down, and be designed to save as much energy as possible. The air for cooling the lubricating oil of the bearing is now fed in directly from outside via an inlet channel - a detail which also improves the economy of a compressor, just as any temperature reduction does.
Flexible and economical
All Aerzen units are already provided with energy-saving IE3 motors, despite the fact that these will only be required by law from 2015. The flexible concept of series Delta Screw additionally permits customised special solutions, such as for special motors, acoustic hoods for special ambient conditions or special instrumentation. The series is easy to service and maintain. The service life of the lubricating oil for the bearing is 16,000 operating hours - this corresponds exactly with the maintenance intervals, which are also 16,000 operating hours, and is another positive development.
