The boiler economizer is an essential energy-saving device that recovers heat from flue gases to preheat boiler feed water, significantly improving thermal efficiency while reducing fuel consumption and environmental emissions.

The economizer functions as a heat exchanger where flue gases flow downward across tube bundles, transferring heat to the tube walls. Feed water flows upward through the tubes, absorbing heat in a countercurrent arrangement that maximizes heat transfer efficiency while minimizing metal consumption and corrosion risks.

• Fuel Efficiency: Reduces flue gas temperatures by recovering waste heat, significantly lowering fuel requirements
• Extended Equipment Life: Preheats feed water to reduce thermal stress on steam drums
• Cost Reduction: Replaces high-temperature components with more economical low-temperature heat exchangers
• Environmental Compliance: Lowers emissions by reducing exhaust gas temperatures

By Material:

• Steel Tube Economizers: Preferred for most applications due to high strength, impact resistance, and excellent heat transfer properties
• Iron Economizers: Less common in modern installations

By Heating Method:

• Boiling Type: Allows partial vaporization (10-15%) of feed water, ideal for medium-pressure boilers
• Non-Boiling Type: Maintains water temperature below saturation point, preferred for superhigh pressure boilers

• Impact test and Strength calculation report with applied materials information
• 100% NDT (non-destructive inspection) of steel plate, tube and electrode
• X-ray, γ-ray and liquid penetrant test inspection for all welding seams
• Hydraulic test report to verify working pressure and safety standards