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MDA Technologies 3/2016

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MDA Technologies 3/2016

COMPRESSED AIR NEWS 03

COMPRESSED AIR NEWS 03 02 The Delta hybrid blower in detail Unlike standard positive displacement blowers, which convey air with no internal compression, the Delta Hybrid blower uses screw compressor technology to compress the air within the machine. Aerzen describes the Delta Hybrid as a rotary lobe compressor or a low-pressure screw compressor. The profile of the rotors is similar to that of higher-pressure screw compressors, but the hybrid achieves higher efficiency by adapting the profile of the rotors for a lower compression ratio to meet the low-pressure requirements of aeration systems. peak daytime demand and initial plant start-up overnight demand,” Hervol said. “Hybrids create almost a straight-line combination of air feed mix to oxygen production, when applied in the right combinations, so the operators never expend more energy than they need for process conditions. Especially out here in the mountain conditions, it’s a new tool that gives us a chance to really save energy.” Improved turndown delivers immediate results One Delta Hybrid D 62S was placed into service in December 2013, and to the delight of the early adopters at the Los Alamos plant, the energy savings and operational benefits have been both immediate and significant. The 125-horsepower blower has a design capacity of 1440 standard cubic feet per minute (SCFM) at 11 pounds per square inch gage (PSIG), with turndown as low as 424 SCFM. (The old centrifugal blowers operated at 1210 SCFM at 10.7 PSIG, with virtually no turndown available). “The Los Alamos plant was Aerzen’s first hybrid blower installation in New Mexico,” Hervol said. “It’s a marvel with regard to energy savings. The difference in power draw truly stands out from the old technology, which they couldn’t turn down to meet their process needs.” Energy savings of $ 5,000 to $ 10,000 per year Currently, the Aerzen blower operates in rotation with one of the old centrifugal blowers, one month on and one month off. Even on 01 New Aerzen Delta Hybrid unit installed in “slot” previously occupied by a similar blower, shown in foreground 02 Front panel of new Aerzen Delta Hybrid unit showing ease of access for monitoring and O&M 03 Inside the blower room at the Los Alamos WWTP this half-time schedule, the plant has achieved energy savings of $ 5,000 to $ 10,000 per year, and Ayers noted that energy costs during the months running the hybrid are cut nearly in half as compared with months that the old blower is used. The Aerzen delivers nearly three times the turndown capability of the old blowers, and with the help of a variable frequency drive (VFD), plant operators are able to easily turn the blower down, regularly running it at 30 to 50 percent of its capacity with no heating problems or complications. Ayers anticipates even greater energy savings once the system is tied into the plant’s programmable logic controller (PLC), which will allow operators to control the blower based on dissolved oxygen (DO) levels, influent flow, hertz, or time and hertz, rather than waiting for manual changes. In addition to saving power, the hybrid blower has eliminated the need for external fans and improved conditions in the blower room, producing less heat and far less noise than the old centrifugal unit. The operators have been so pleased with the operation of the Delta Hybrid that they plan to purchase a second identical blower to replace the remaining multistage, allowing the Los Alamos WWTP to achieve full-time energy savings. www.aerzen.com MDA Technologies 3/2016

COMPRESSED AIR NEWS Product News Turbo blowers for small and medium volume flows The Aerzen turbo series TB was particularly developed for biologically operating wastewater treatment plants with small and medium volume flow requirements. It has now been revised. Aerzen sells the packaged units in 11 series which offer air volumes from 300 to 6,000 m³/h for pressure ranges from 300 to 1,000 mbar. The innovative system experienced a number of constructive adjustments resulting in another positive effect on the energy saving. Constructive improvements within the packaged unit ensure an optimised air guidance which, eventually, minimizes pressure losses at the intake side. Since electrical and mechanical engineering are separated by open ground, heat losses of the power electronics are not passed to the process air. The separation increases the efficiency and the reliability of the electrical engineering. The plug&play system operates almost maintenance-free and absolutely oil-free; only filters have to be changed in regular cycles. The air flow is not measured indirectly, as it is the conventional way, i.e. derived from the power consumption. It is performed according to the Venturi principle. By means of a differential pressure measurement the real air-mass flow is measured in the inlet cone of the stage. In this way, the packaged unit provides real measured values for the monitoring and the internal safety devices. The extremely fast response characteristic of the frequency converter enables it to compensate difficult conditions, as for example to react on pressure fluctuations by fast change of speed. The result is a significant minor sensibility of the turbo blower throughout the total control range. Thus, users can comprehend at any time the exact quantity that is really led into their tanks. This parameter is also shown directly via the control system. www.aerzen.com background: fotolia In-house oxygen production: flexible and efficient With the Boge generator types O 3 P to O 15 P, and O 3 PE to O 15 PE, users have a safe and reliable all-in solution for producing oxygen with adsorption technology. This proven process lets users generate their own inexpensive, tailor-made and dependable supply of oxygen on site, with purity levels reaching 90 to 95 percent. Whether for water treatment, the medical sector, mining, welding or fish farming – the new Boge oxygen generators can be used wherever oxygen enrichment and thermal processes take place. The advantages of in-house oxygen production are obvious in comparison to oxygen deliveries from external suppliers – users obtain precisely the purity, output and amount of oxygen they need for their processes. As a system provider, Boge offers an ideally matched complete system comprising a compressor, filter, refrigerant dryer, activated carbon adsorber, compressed air container, oxygen generator and oxygen container. If a compressed air station is already available, generators can easily be connected to the existing network. To produce oxygen, the generators require class 1:4:1 treated compressed air complying with ISO 8573-1 (with an additional activated carbon adsorber). The quantity of compressed air that is needed depends on the oxygen purity required. www.boge.com MDA Technologies 3/2016