Recuperator – Air Economizer

What is Air Economizer Recuperator? Use of Air Heater Recuplator in Industrial Boilers

One of the most effective ways to increase energy efficiency in industrial boiler systems is to bring the heat carried by the hot gases discharged from the chimney back into the system. Air economizer, recuperator, or air heater recuperator as it is frequently called in the industry, is a special heat recovery equipment used for this purpose. The hot flue gas coming out of the boiler is passed through the heat transfer surfaces inside the recuperator body. In the same process, the clean air to be sent to the combustion system is pre-heated with the energy it receives from these surfaces. Thus, the combustion air entering the boiler becomes hotter, the fuel burns more efficiently and the energy costs of the business decrease.

The system in the product image sent is an example of a vertical type air economizer recuperator application integrated into the boiler and chimney line in the field. It has a design suitable for working in heavy industrial conditions thanks to its lower conical chamber body, steel carcass structure, connection channels and large heat transfer surface. This type of industrial air heater systems; It is preferred to achieve high efficiency in steam boilers, hot water boilers, solid fuel boilers, biomass boilers, coal-fired boilers and power plant boilers.

How Does Air Economizer Work?

The working principle of the air economizer is to transfer the flue gas heat to the combustion air. When the hot smoke gases formed as a result of combustion in the boiler are sent directly to the chimney, a significant amount of energy loss occurs. The recuperator is placed on the chimney line or at the appropriate point at the boiler outlet to reduce this loss. As hot gases pass through the system, they heat the metal heat transfer surfaces. The fresh combustion air sent by the fan heats up by contacting these surfaces and reaches the burner or combustion chamber at a higher temperature.

During this process, flue gas and clean air do not mix with each other. Heat transfer occurs in a controlled manner over steel surfaces. Therefore, the system both provides energy recovery and preserves the quality of the combustion air. A correctly designed air preheater helps the boiler operate more stablely, fuel burns better, and reduces the flue gas temperature.

Advantages of Using an Air Heater Recuperator

Using an air heater recuperator is not limited to just providing fuel savings. It increases the overall efficiency of the system, supports the sustainability of the process and helps control operating costs. Flue gas heat recovery provides significant economic contribution in the short and medium term, especially in continuously operating industrial boilers.

• Increases boiler efficiency by pre-heating the combustion air.
• Reduces fuel consumption and lowers operating costs.
• Reduces waste heat loss by lowering the flue gas temperature.
• Provides energy efficiency in industrial boiler systems.
• Combustion quality in solid fuel boilers and biomass boilers.
• It contributes to the reduction of carbon emissions.
• It can be used in process air heating and combustion air preheating applications.
• It can be adapted to the existing boiler and chimney line thanks to project-specific manufacturing.

Are Recuperator, Recupulator and Air Preheater the Same Product?

In the technical literature, the correct usage is “recuperator”. However, the expressions “recuperator”, “recupulator”, “air heater recuperator”, “air heater recuperator” and its English equivalent “air preheater” are also frequently used in industry and internet searches. All of these terms generally refer to industrial equipment that heats air by recovering waste heat. Air economizer recuperator systems manufactured by Hisarmak are designed according to engineering calculations for this need.

Which Boiler Systems Are They Used in?

Air economizer and recuperator systems have a wide application area. When the steam boiler is used as an air heater, it provides fuel economy in steam production. When a hot water boiler is used as an air economizer, it increases combustion efficiency in hot water production. Solid fuel boiler recuperator and biomass boiler air heater solutions provide effective results in systems working with coal, lignite, biomass, pellets, sawdust, pomace and similar fuels.

Power plant recuperator is preferred to obtain maximum benefit from flue gas energy in high capacity boiler systems. Steel recuperator manufacturing is of critical importance in heavy-duty applications that require high temperature resistance and long life. For this reason, material selection, welding quality, body strength, maintenance covers, connection flanges and air/gas transition sections should be determined according to the project.

Project-Specific Air Economizer Manufacturing

The layout, chimney line, gas flow rate, temperature value, fuel type and operating needs of each boiler room are different. For this reason, air economizer manufacturing should be done not with standard dimensions, but with project-specific engineering work. Body dimensions, vertical or horizontal layout, inlet-outlet ducts, carrier construction, sub-chamber structure and service access are designed according to facility conditions.

Hisarmak, with its experience in industrial boiler equipment production, offers field-appropriate solutions in the production of air economizers, recuperators and boiler air heaters. Product design not only improves heat transfer efficiency; It also takes into account ease of installation, accessibility for maintenance, mechanical strength and long-term operating safety. This approach means lower energy costs and more sustainable production for businesses.

Difference Between Air Economizer and Boiler Economizer

Boiler economizer generally transfers the heat in the flue gas to boiler feed water or process water. The air economizer recuperator transfers the heat in the flue gas to the combustion air. Both systems operate as waste heat recovery systems; But the heated fluid is different. While only the boiler economizer is sufficient in some facilities, in some applications higher energy efficiency is achieved when used together with the air preheater.

Conclusion

The air economizer recuperator is a powerful and efficient solution to recover the flue gas energy lost in industrial boilers. These systems, which are also sought as air heater recuperators; It is an important investment for businesses aiming to save fuel, increase boiler efficiency, reduce flue gas temperature and energy efficiency. Hisarmak produces durable and high-performance recuperator solutions suitable for the needs of industrial facilities by manufacturing project-specific air economizers.