EXPLAINING COMPRESSED AIR In the second article looking at compressed air, Kaeser Compressors explains what sorts of compressed air are available ONSITE INSTRUMENT HAND-HELD TEMPERATURE UNIT 7, 123 CRYERS ROAD EAST TAMAKI, AUCKLAND 0064 9 271 6560 - tony@instrument.co.nz - www.instrument.co.nz 34 AUGUST 2017 INDUSTRIAL INSTRUMENTATION LTD CALIBRATIONS CALIBRATIONS FT277 CONSEQUENCE AND CONFIDENCE It’s that time of the year…when quality people are on your case to get the calibration schedule completed, finding old reports, choosing which instruments have to be done…and it goes on. So, why do we put ourselves through this? Why do your instruments need to be ‘calibrated’? The key word here is consequence, because in order to answer the first question, you have to reply with a second. What is the consequence of the measuring instrument being incorrect? If there is no consequence to the inaccuracy, then there is no need to have the instrument calibrated. The second key word here is confidence, because once you have identified the instruments to be calibrated, you must use somebody in whom you have confidence to carry out the calibrations. ISO 17025 accreditation is all about confidence - in people, procedures and equipment. It’s what we get audited on. L O G I S T I C S One type of drying process involves dryers with significantly more compact dimensions capable of superior adaption to the compres sor - these are known as ‘heat of compression’ (HOC) dryers. In this design, the desiccant is contained in a drum through which the compressed air flows in an axial direction. Desiccant regeneration and compressed air drying take place continuously, within a single pressure receiver. The drying and regeneration sectors are separated, however, both structurally and in terms of process. Slight pressurisation of the drying sector ensures that once dried, the compressed air does not reabsorb moisture from the regeneration air flowing by in the adjacent sector. The dryers are integrated in dry-running compressors, which – in contrast to oil-injected compressors – feature two compression stages and generate significantly higher temperatures during the compression process. Drying without additional energy consumption In these integrated rotation dryers, desiccant regeneration takes place continuously, using the heat that already exists in the hot compressed air. Following regeneration, this heat is not lost, but rather the hot air is cooled down by the second compressor stage’s cooler and the heat is fed into the drying sector by a radial blower. This means that the heat arising as a result of compression of the air is also used for desiccant regeneration. Consequently, this heat is freely available without cost, since no additional energy is required for the drying process. This translates into maximum efficiency and outstanding drying reliability. This perfect interplay between the compressor and dryer also avoids additional energy costs, which are unavoidably incurred in the case of conventional desiccant dryers which use additional, external energy for desiccant regeneration. Furthermore, the energy cost savings from integrated rotation dryers continue to apply even with variable free air deliveries.
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