Stainless steel economizer tubes CFB boiler economizer In thermal
power plant high corrosion
1.Economizers are mechanical devices intended to reduce energy
consumption, or to perform useful function such as preheating a
2.The term economizer is used for other purposes as well. Boiler,
power plant, heating, Refrigeration, ventilating, and air
conditioning (HVAC) uses are discussed in this article.
3.In simple terms, an economizer is a heat exchanger.
4.The economizer has advanced manufacturing technology, strict
production technology, detection means, with high-tech snake-like
tube production lines.
|Fin tube thread pitch||5-30|
|Fin tube length||≤12000|
*Note:HD BOILER can bespoke special type of economizer according to
1.Economizers must be sized for the volume of flue gas, its
temperature, the maximum pressure drop allowed through the stack,
what kind of fuel is used in the boiler, and how much energy needs
to be recovered.
2.Economizers designed for natural gas only, would likely plug-up
if installed on a coal boiler and would face increased risk of
corrosion if installed on an oil-fired boiler.
3.Some units are designed to keep the flue gases above condensation
temperature, and others are made of materials that resist the
corrosive effect of condensed flue gases.
During boiler operation in typical commercial and industrial
applications, approximately 10-20% of the heating value of fuel is
expelled with the stack gases to the atmosphere. Stack economizers
are designed to recover significant amounts of this stack gas
energy loss, thereby vastly improving boiler system efficiency.
There are several considerations when selecting an economizer:
• Gas-side Pressure Drop. Added back-pressure on the boiler stack
affects the combustion air fan throughput capability. The
economizer and combustion air fan(s) must be sized properly in
order to assure a suitable system operation and capacity.
• Feedwater Temperature. The feedwater to the economizer must be
deaerated and the temperature setpoint minimally at 220oF to
prevent tube corrosion.
• Water-side Pressure Drop. Feedwater pumps must be sized to
accommodate the economizer pressure drop. Additionally, a
continuous modulating feedwater system is required to ensure proper
flow rates through the economizer.
1. Impact test and Strength calculation report with applied
2. 100%NDT(non-destructive inspection) report of steel plate, tube
3. X-ray, γ-ray and liquid penetrant test inspection report
(welding seam): to ensure the quality of the entire boiler.
4. Hydraulic test report: ensure the standard working pressure and