Mechanical Condensing CFB Boiler Economizer Heat Exchanger Seamless
Pipe,Utility/Powe Station Plant Using
Product Introduce
Economizers are mechanical devices intended to reduce energy
consumption, or to perform useful function such as preheating a
fluid. 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. In simple
terms, an economizer is a heat exchanger.The economizer has
advanced manufacturing technology, strict production technology,
detection means, with high-tech snake-like tube production lines.
Parameter
| Name(unit) | Specification(mm) |
| Bare pipe(OD) | 25-165 |
| Bare pipe(Thickness) | 2-8 |
| Fin (Thickness) | 0.6-3.0 |
| Fin (Height) | 5-30 |
| Fin tube thread pitch | 5-30 |
| Fin tube length | ≤12000 |
*Note:HD BOILER can bespoke special type of economizer according to
customer's requirement.
Details
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. 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.
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.
Application
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.
Quality Control
1. Impact test and Strength calculation report with applied
materials information.
2. 100%NDT(non-destructive inspection) report of steel plate, tube
and electrode.
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
safety.
Functions
1. Absorb the heat of low-temperature flue gas, reduce the smoke
discharge temperature, reduce smoke loss, and save fuel.
2. Since the feed water is heated in the economizer before entering
the steam drum, the heat absorption of the feed water on the
heating surface is reduced, and the economizer can be used to
replace part of the evaporation heating surface with higher cost.
3, feed water temperature increased, into the drum will reduce the
wall temperature difference, thermal stress corresponding to
reduce, extend the service life of the drum.
Company Introduction
Established in 1985,Zhangjiagang Hua Dong Boiler Co.,Ltd.(trading
as HD Boiler),produces power plant; industrial; waste heat; waste
incineration; biomass; organic heat carrier and electric steam
boilers. Coupled with a comprehensive range of heating surfaces, HD
Boiler brings to the market a unique service including boiler
design , fabrication, installation, maintenance and replacement of
boiler pressure parts.
1. Fabrication area of 400,000 square meters
2. 150 Engineers
3. 600 Coded welders
4. 60 Licensed Inspectors(NDT Level-III instructors)
5. Class-A Licenses for Design and Manufacture Boiler
6. ISO 9001:2008 Quality System
7. ASME Certificate of Power Boilers
8. ASME 'S','U' and NB stamp authorization
