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[China]
Trade Verify
Address: Address: N0.1, Dongli Road, Donglai, Zhangjiagang City, Jiangsu Province, China
Contact name:Sandy Chen
Zhangjiagang HuaDong Boiler Co., Ltd. |
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Verified Suppliers
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Export amercian sprial type integral economizer ND steel or
carbon steel
Product Description
· Economizers are mechanical devices intended to reduce energy
consumption,or to perform useful function such as preheating a
fluid.In simple terms,an economizer is a heat exchanger.
· In a steam boiler ,it is a heat exchanger device that heats up
fluids or recovers residual heat from the combustion product i.e.
flue gase in thermal power plant before being released through the
chimney.
· Flue gases are the combustion exhaust gases produced at power
plants consist of mosly nitrogen,carbon dioxide,water vapor,soot
carbon monoxide etc.
· Hence,the economiser in thermal power plants,is used to economise
the process of electrical power generation,as the name of the
device is suggestive of.
· The recovered heat is in turn used to preheat the boiler feed
water,that will eventually be converted to super-heated steam.
· Thus,saving on fuel consumption and economising the process to a
large extent, as we are essentially gathering the waste heat and
applying it to,where it is required.
· Nowadasys however,in addition to that,the heat available in the
exhaust flue gases can be economically recovered using air
preheater which are essential in all pulverized coal fired boiler.
Technical specifications
Material Structure
Consists of a serious of spiral fin tubes, the headers of inlet and
outlet, bend, frame and other auxiliaries.
Structure Arrangement
In line / staggered arrangement.
Working Pribciple of Economizer
1.As shown in the figure above,the flue gases coming out of the
steam boiler furnace carry a lot of heat.
2.Function of economiser in thermal power plant is to recover some
of the heat from the heat carried away in the flue gases up the
chimney and utilize for heating the feed water to the boiler.
3.It is simply a heat exchager with hot flue gas on shell side and
water on tube side with exxtended heating suface like Fins or Gills
Economisers in thermal power plant
Economisers must be sized for the volume and temperature of flue
gas,the maximum prssure drop passed the stack,what kind of fuel is
used in the boiler and how much energy needs to be recovered.
When the water is boiled in steam boiler,the steam is produced
which is then super-heated after which it is passed to the
turbines.
Then the exhausted steam from turbine blades,is passed through
steam condenser of turbine in which the steam is condensed and this
condensed water then is pre warmed first in feed water heater then
in it before re-feeding in boiler.
It is placed in the passage of flue gases in between the exit from
the boiler and the entry to the chimney.
In this a large number of small diameter thin walled tubes are
placed between two headers.
The flue gases flow outside the tubes usually in counter flow.
Parameters
| Name | Economizer |
| specifications of finned tube | unit(mm) |
| Bare pipe(od) | 25-165 |
| bare pipe(thick) | 2-8 |
| finned thicks | 0.6-3.0 |
| finned height | 5-30 |
| finned tube thread pitch | 5-30 |
| finned tube length | ≤12000 |
*Note:HD BOILER can bespoke special type of economizer according to
customer's requirement.
Quality Control
| · | Impact test and Strength calculation report with applied materials information. |
| · | 100%NDT(non-destructive inspection) report of steel plate, tube and electrode. |
| · | X-ray, γ-ray and liquid penetrant test inspection report (welding seam): to ensure the quality of the entire boiler. |
| · | Hydraulic test report: ensure the standard working pressure and safety. |
