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Boiler Basics 101: Economizers for Increased Efficiency

The price of fuel is constantly fluctuating and with it comes creative ways to be more economical. Finding methods to be more energy efficient is never a waste of time. In the boiler room, efficiency improvements can be found by many sources, however, a common option for energy savings includes the use of an economizer. What is an economizer? The economizer is a fabricated assembly of finned tubing that captures waste heat extracted from the boiler’s stack flue gases; the exhaust that leaves the boiler stack (or “flue”).

It’s all about the principle of Heat Transfer. While low temperature water, or feedwater, enters a boiler system, high temperature flue gas exits. An economizer captures heat from the flue gas that would typically go to waste, and utilizes it to preheat the feedwater. By doing this, an economizer is able to increase thermal efficiency by decreasing the energy required to heat the water to steam. This will typically result in a reduction of 1% in fuel cost per 10 degree rise in feedwater temperature. Overall, an economizer can be a major cost savings for boiler owners and will easily provide a quick return on investment.

The economizers’ simple technology and static parts provide longevity and low maintenance, and they are available in multiple designs and configurations. Conventional economizers are cylindrical or rectangular and come in a range of sizes for both firetube and watertube boilers. Rectangular designs are more commonly used for larger industrial watertube boilers, and can be configured for vertical or horizontal gas flows, finned or bare tube design, and other additional options if needed. A condensing economizer can improve waste heat recovery even further by cooling the flue gas below its dew point, reclaiming both sensible heat from the flue gas and latent heat by condensing the flue gas water vapor.

BOILER EFFICIENCY COMPARISON
  Combustion Efficiency at
4% Excess Oxygen
Stack Gas
Temperature
 Boiler  78% to 83% 350F to 355F
 Boiler with Standard Economizer  84% to 86%  250F to 300F
 Boiler with Condensing Economizer  92% to 95%  80F to 150F


When determining whether an economizer is ideal for your boiler equipment, the location of the economizer into stack is important. To ensure the most thermal recovery during the process, you need to make sure the economizer is installed as close to the furnace breach as possible. This will help avoid thermal loss and cooling.

At Nationwide Boiler, we offer our EconoStak economizer as an optional addition (or a standard addition in some cases) on our fleet of watertube rental boilers. The EconoStak consists of the economizer as well as all of the associated piping and structural supports required for very efficient and safe operation. In addition, we are a West Coast representative for E-Tech Heat Recovery Systems, a leading provider of economizers for new, replacement, and retrofit applications.

Contact Nationwide Boiler today to see if an economizer is the right option for you, and be sure to check out our previous Boiler Basics 101 blogs. We review various topics each month, so stay tuned for the next edition!

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Monday, 09 December 2019 08:15
Guest — Emma
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Tuesday, 10 March 2020 08:02
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Free Webinar Offered by the IDEA

In partnership with the Department of Energy Southeast Clean Energy Application Center, the International District Energy Association (IDEA), a nonprofit trade association created to facilitate the exchange of information among district energy professionals, is hosting a free webinar on November 17, 2011 (1:000-2:00 pm EST). The webinar, entitled "District Energy and CHP - Valuable Infrastructure for Sustainable Communities", will provide insight into the emergence of district energy in North America and will include two case studies that highlight its' success. Speakers will include Robert Thornton, President and CEO of the IDEA, Ray DuBose, Director, Energy Services at UNC-Chapel Hill and Harry Ragsdale, President, Thermal Engineering Group, Inc.

To learn more about this event or to register, click here.

Nationwide Boiler has been a proud member of the IDEA and we support the organization's goals of promoting energy efficiency and environmental quality through the advancement of district heating, district cooling and cogeneration.

IDEA
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Energy Efficiency Workshop for Users in Indiana

The Purdue University Technical Assistance Program is offering a one day workshop on energy efficiency programs and improvements for facility owners, managers and engineers in the state of Indiana. Anyone who is interested in implementing an energy efficiency program will learn how to reduce the use of energy while decreasing operating costs and your carbon footprint.

Date: Tuesday, August 10, 2010

Time: 8:00 am - 5:00 pm

Please visit www.tap.purdue.edu/energy for more information.
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Nationwide Environmental Solutions Signs Combustion Designs, Inc. as New East Coast Representative

Nationwide Environmental Solutions is pleased to announce the signing of Combustion Designs, Inc. as its new East Coast Representative for the company's environmental product line. Combustion Designs will promote the sale of the CataStak(TM) SCR system for emissions reductions and other solutions for boilers, heaters, turbines and furnaces.

Check out the press release for additional information.
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