Hello Mechanical World please meet Mrs. Electronics!
Positive displacement blowers and compressors have been around for well over 100 year. Predominately process and maintenance folks have viewed them as mere mechanical devices that did not represent any worth in protecting and managing them electronically. How dramatically different our world looks like today! In a time where machinery is expected to fend for itself it makes great sense to monitor and manage your blowers and compressors and treat them as the assets they represent to your company. The problem is how to best do it when you either buy new machines or systems. Or how do you retrofit old blowers and compressors with systems that will later nicely integrate into your plant operating system?
The system integration has always been one big obstacle in the integration process - next to cost of course. Aerzen USA has generated a new approach to this challenge in form of our iAir Pneumatic Control Blower and Compressor control system that is offered as an augmentation to the already well known AS and ASG control platforms. Here we have a controller
that is easy to use as it features a touch screen interface with all the pertinent information on a single screen shot. If you want more information, simple touch the area of your interest and more details will show of on the display. It can handle blower as well as single stage oil free compressor applications. In its basic version it can be connected to your plant system via Ethernet TCP, Modbus, Profibus or simply SCADA I/O's.
Using instrumentation solves a whole variety of issues. The most important one is that it protects against overloading or abuse of the blower or compressor. Basic operating parameters are monitored and if necessary provide an alarm or shut down signal. Another big ticket item especially in the construction phase of a new installation is that hard wiring cost can be greatly reduced by using a two-wire communication protocol that can connect at least up to 12 machines and still provide all the information as if you stood in front of the controller itself. That is really powerful information for operators and plant managers alike. Would you not want your machine telling you automatically that it needs attention? How about uptime management that you would be able to do with it? Please drop me an email if you are interested to learn more about how we can put money back onto your bottom line.
Ralf Weiser - firstname.lastname@example.org
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Right-sizing Aeration Blowers in Waste Water Treatment Plants
As the main consumer of electricity in a wastewater treatment plant, the aeration system greatly influences the overall cost of operation, that in the longterm by far exceed the initial investment cost. Several blower technologies can be chosen from and it therefore behooves the engineer to accurately evaluate the characteristics of the aeration blowers and carefully interpret some of the claims made by various manufacturers. The most energy efficient solution must be based on actual conditions that, in reality, will vary over an extended period of time.
The economical operation of a wastewater treatment plant depends largely on the design and the interplay of the aeration and process controls. Moreover, the human factor and the management objectives are at the heart of the plant's reality and should also be taken into consideration. Selection and thoughtful integration of all the subsystems is of paramount importance.
Taking a pragmatic approach, Aerzen USA developed a whitepaper on the subject. This paper presents ways to minimizing the energy usage: right-sizing, aeration control, defining the operating range and matching the blower technology to the application, and comparing operating data over time.
The paper presents four types of blowers: two dynamic and two positive displacement machines. Since each technology has its place, a comparison is made specifically based on the treatment of wastewater. Taken into account are the daily and seasonal swings in oxygen demand, fouling and aging of diffusers, air flow control and turndown capabilities, total blower efficiency and energy consumption over time, mode of operation, blower accessories, and plant set-up. The paper recommends engineers to exercise due professional diligence and to select the most suitable aeration blower technology based on a relevant comparison.
To learn more about selecting to correct aeration blower for your application download the new whitepaper "Aeration blowers in the wastewater industry in North America"
Video:Tom McCurdy explains Right-sizing Aeration Blowers in Waste Water Treatment Plants