Economizer Module Boiler Heating Element Plate Type Air Preheater
High Pressure
Introduction
The H-shaped finned tube is also known as the H-shaped fin tube,
also known as the butterfly fin tube. It is to weld symmetrically
two pieces of steel with an arc in the middle to form fins (ribs or
butterflies), the frontal shape of which resembles the letter "H",
so it is called the H-shaped finned tube.
The two fins of the H-shaped fin tube are rectangular and
approximately square. The side length of the tube is about 2 times
that of the smooth tube. It belongs to the extended heating
surface. H type finned tube adopts flash resistance welding
technology. The weld seam fusion rate is high and the weld tensile
strength is large after welding.
The H-shaped finned tube can also be made into a double-tube
"double H" finned tube, which has good rigidity and can be used in
the situation where the tube row is longer. The finned economizer
can be used instead of the smooth tube economizer. It can
effectively increase heat transfer area, increase flue gas flow
section, reduce smoke velocity and reduce wear.
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 Max.:1000 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 |
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.
Function
(1) The economizer is a steam generation system as like a boiler.
when the exhaust gas discharge from the engine cylinder through the
exhaust valve it goes to the boiler for generate steam by heating
of water.
(2) After those gas it goes through the economizer the remaining
exhaust gas temperature is heated the water in economiser. it help
to generate steam, and it is improving the efficiency and save the
fuel consumption
(3) An economizer uses the waste heat from the boiler exhaust, that
would otherwise be lost to atmosphere to (in most cases) preheat
the feed water into the boiler.This improves the boiler efficiency
and reduces fuel costs.
Variety
Utility Boiler Economizer
| 1 | HDB produces economizers for utility boilers, which includes
boilers fueled by coal, wood, oil, or other solid fuels to produce
electricty from the boiler's high pressure steam. |
| 2 | These economizers are usually located in the back pass of the
boiler and oriented with the tubes running horizontally.The boiler
feedwater runs through the economizer circuits in the opposite
direction of the gas flow (called counterflow). |
| 3 | Bare tubes are typically utilized in order to minimize ash fouling,
but some boiler OEM's design their economizers with finned tubes,
either spiral or long finned. |
| 4 | HDB can produce economizer elements with either bare, spiral
finned, or long finned tubes, and if you prefer, re-design your
unit to one of the other tube-types. HDB can also fabricate
replacement headers for all utility boiler economizers. |
Package Boiler Economizer
| 1 | HDB has unique manufacturing capabilities that the Optimus
engineers take full advantage of when designing sulfuric acid plant
economizers and superheaters. |
| 2 | Often this allows the Optimus units to be configured for higher
heat transfer efficiencies which results in a reduced surface area
requirement and, consequently, a lower-priced product. |
| 3 | HDB utilizes its on-site capabilities to fin and bend the tubes,
machine and fabricate the headers, drill the tubesheets, cut and
prep all casing materials, and perform all of the pressure part and
casing welds. |
| 4 | This gives HDB more control of the manufacturing sequence and
schedule which has helped us achieve a remarkable record of on-time
delivery performance. |
HRSG Economizer
| 1 | Economizers for today's HRSG modules are configured with fintubes
that hang vertically. HDB has fabricated economizer coils for
virtually all of the HRSG OEM companies and understands the unique
features of each. |
| 2 | In many cases, utilities desire to upgrade their economizers from
plain carbon steel to an alloy material to help resist flow
accelerated corrosion (FAC) inside the headers and tube bends. |
| 3 | HDB is a one-stop shop for economizer fabrication because we prep
all the materials and perform all of the pressure part and
attachment welding, from finning the fintubes, fabricating the
headers, and assembling the coil bundle. |
Manufacturing and acceptance criteria
| · | JB/T6512 "boiler with a high-frequency resistance welding spiral
fin tube manufacturing technology conditions" |
| · | HG/T3181 "high-frequency resistance welding spiral fin tube" |
| · | JB/T6511 "spiral finned tube test technical conditions." |
| · | JB1611 "boiler tube mane box assembly conditions" |
| · | JB/T1612 "boiler pressurufacturing conditions." |
| · | JB16I3 "boiler pressure parts welding conditions." |
*Note:HD BOILER can bespoke special type of economizer according to
customer's requirement.
Performance advantages
1.Application of flue gas waste heat recovery system for tail flue
of power plant boiler
The thermal temperature is low, usually 100℃ or so with not good
quality.
(1) This part of the recovery of heat is not equivalent to the
method of calculation, but should be equivalent conversion method
or heat balance calculation to determine the effective use of heat
recovery value (thermodynamics second law).
2. Used in other industrial boilers in the flue gas waste heat
recovery device
(1) Under normal circumstances, the economy is in priority in power
plant application. This is because in other industrial boiler
systems, the available steam resources are limited. For users with
not enough steam, the recovery of heat can be considered 100%
available resources, the most economical.
(2) flue gas waste heat exchanger advantages
| ◆ | improve the efficiency of recycling, reduce coal consumption; |
| ◆ | improve the efficiency of dust removal (before the installation of
dust collector); |
| ◆ | reduce the evaporation of desulfurization tower, saving water. |
