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Boiler Spare Parts Power Station Boiler Economizer for Pulverized Coal-fired CFB Boiler
Summary
There are three stages from the feed water in the boiler heated
into superheated steam:feed water preheating, evaporation, and
superheating. The three stages are finished on three different
heating surfaces. The boiler steam and water circuit are composed
of the three different heating surfaces as well as their connecting
pipes. Boiler economizers are one of them, and it is right the
equipment to preheat the feed water. Thus, it is the heating
surface with the lowest temperature for boiler working fluid in the
boiler steam and water circuit. The working fluid passing through
this equipment is monophasic water(non-boiling economizer).
The structure of boiler economizers
No matter it is boiling or non-boiling type, their structures are the same. They are made of horizontal surpentine pipes, with inlet and outlet headers in parallel. The connection of surpentine pipes and headers are usually finished by welding. Headers are generally places outside of boiler's flue system. If there are lots of heating surfaces in economizer, the general height is quite high. We can divide them into several sections. Shown in picture 3-1, it is divided into two sections, each height is about 1-1.5m, their distance is 0.6-0.8m as overhaul room. In addition, it is needed to set aside 0.8-1m of space for overhaul and clearance of accumulated dust on the heating surfaces.
Types
If according to materials, economizers can be divided into steel
tube economizers and iron economizers. At present, most large and
medium volume boilers widely use steel tube made economizers,
because they have high strength and reliable working ability, and
are able to withstand impacts, meanwhile they have good performance
of heat transfer, small structure and low cost. One weak point is
bad corrusion resistance, but now the modern boiler feed water are
strictly treated, so the problem is almost solved.
If according to heating extension of the working fluid, economizers
can be divided into non-boiling and boiling types.
Functions
1. fuel saving: the economizers are placed at the rear part of
boilers. This way can decrease the smoke and gas temperatures, thus
to save fuels.
2.improve the working conditions of steam drums: due to
economizers, the feed water temperature is increased when entering
the steam drum. It reduces the temperature difference between the
feed water and steam drum wall as well as steam drum thermal
stress, so that it improve the working conditions of steam drums
and increase the service life.
3.reduce the boiler manufacturing cost: for the feed water is
heated in the boiler economizers. The use of low temperature spare
parts as boiler economizers to replace some of high-priced high
temperature water wall panels reduces the cost to manufacture
boilers.
Specifications
| Description | Boiler economizer |
| Material | Alloy steel, Carbon steel, SA210C ,SA213T22, etc. |
| Material standard | ASTM, EN or ISO etc. |
| Dimension | Customization |
| Weight | Min: 10 ton |
| Smelting Process: | EF+LF + VD |
| Process | Material→Ingot → Hot/Cold-Rolling→ Heat treatment (Normalizing+ tempering) → Inspection →rough machining→UT →2nd Heat treatment →finishing machining →Inspection |
| UT standard | ASTM A388 or EN10228, etc |
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
