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Zero loss desiccant air dryers with maximum energy efficiency

04 December 2008

The latest smart versions of the ZL-HBP (zero loss-heater blower programme) desiccant air dryers manufactured by Hi-Line Industries are claimed to offer the lowest cost of ownership currently available for adsorption dryers. Their unique control system monitors and modifies operating parameters to ensure the compressed air inlet conditions are matched to the dewpoint required.

These products achieve dewpoints of -70° PDP without loss of expensive compressed air and feature fully insulated vessels, as well as heater and heat-exchanger for good thermal efficiency. This is complemented with a generous vessels and an automatic energy management system (AEMS) which achieves regeneration of the desiccant using low-tariff electricity. Waste heat utilisation from steam, oil or compression can be optionally used where available, with a fan motor also optimised for minimum power consumption resulting in a total ‘climate change levy’ beating package.

Dryer units are available with flow rates from 10 up to 10,000 scfm. Stainless steel pipework is fitted as standard with independent fail-safe switching valves and full-flow check valves (low pressure drop) incorporated. Pressure equalisation and heater protection systems are also provided, eliminating pressure fluctuations and maintaining safety standards.

Equipment is manufactured on site in the UK to the highest specifications. Pressure vessels conform to British/European standards EN286, BS5500 and ASME VIII, with 316 stainless steel pipework and valves being Argon purge tig welded.

Products comply with EEC machinery directive, are CE marked and PED compliant, with electrical wiring conforming to 17th edition IEE regulations. Dryers are designed to occupy the smallest footprint, so not wasting valuable production space, with bespoke dryers also supplied to suit specific customer requirements. Installation and commissioning is included in the selling price, with a one-year warranty covering parts and labour. A five year warranty can also be provided with a service contract.

The control panel providing AEMS control is constantly analysing parameters and making adjustments to maintain the lowest possible running costs. It provides a user interface with indicator panel where digital dewpoint, pressure, heater and electrical displays, together with the cycle stepping time are shown on screen. Regeneration temperatures are controlled from the PLC (Rockwell, Mitsubishi, Siemans, Fanuc, Allen Bradley etc plus software to customer choice) with cycle times matched to demand and triggered by the dewpoint control setting. The control unit, incorporating AEMS, can also be offered as a retro-fit item to optimise the energy performance and provide improved efficiency and operation for any existing dryers.

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