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Scheme of transforming circular bag of boiler bag dust collector into pleated bag
Without changing the structure of the boiler bag filter body, the high-temperature corrugated bag skeleton is used to increase the filtration area, th
Product details
Boiler bag dust collector circular bag transformed into pleated bag to meet emission standards:
1、 Filter material design requirements:
1 Temperature resistance: Long term exposure to high temperatures will not reduce its strength and cause damage to the filter bag.
2 Properties: resistant to oxidation, acid, and hydrolysis, non hygroscopic at high temperatures, and resistant to water vapor and acidic substances in flue gas. Chemical stability is the basis for obtaining the strength of filter media.
3 Folding resistance: Long term expansion and contraction movements, with sufficient mechanical strength and good dimensional stability, ensure that the filter bag maintains long-term use without deformation.
4 Wear resistance: Suitable for smoke and dust components.
5 Low resistance and high performance: Good breathability, filtration accuracy meets emission standards, and the operating resistance increases slowly, which is the basis of the service life of the filter material.
2、 Design and Manufacturing of Filter Media and Product Technical Description ：
1
Design of Fine Composite Filter Material:
Based on the characteristics of the flue gas working conditions of coal-fired boilers, it is required that the filter bag has good dimensional stability, high strength, high filtration degree, and easy ash cleaning. It should be both resistant to oxidation and breathable.
Recommended by
PPS+PTFE
Fine composite filter material, which fully meets the requirements of normal operating temperature<
160
℃ (operating above dew point), instantaneous temperature
190
Used under the condition of ℃; The initial pressure difference during the operation of the dust collector is less than
900 Pa
During the service life,<
1200 Pa
.
Without changing the structure of the dust collector body, using high-temperature corrugated filter bags can increase the filtration area and reduce the filtration wind speed. The filtration wind speed can be reduced to
1 m/min
，
Meet the requirement of dust collector outlet emission value ≤ 10 mg/Nm ³, with an expected emission index of around 6-8 mg/Nm ³; The service life is 5 years.
Filter bag specifications (suggested, can be adjusted appropriately): φ 160 × 6500 mm, quantity: 3195 pieces.
3、 Performance parameter table
：
Serial Number
term
eye
one
position
index
1
PRODUCT MODEL
φ
160
×
6500 mm
2
material
PPS+PTFE/PTFE
base cloth
3
Allow continuous use of temperature
℃
＜
160
4
Allow high usage temperature
℃
190
5
Mass per unit
g/
㎡
680
6
thickness
mm
2.0
±
0.2
7
breaking strength
Warp Direction
daN/5
×
20cm
800
zonal
daN/5
×
20cm
1100
8
elongation at break
Warp Direction
<15
zonal
<45
9
Breathability
L/
㎡
*s（127 Pa）
100-160
10
Skeleton material
20#
steel
11
Skeleton surface treatment
Organic silicon spraying
4、 Technical characteristics of fine composite filter material
：
1
The filtration accuracy of the filter material. The addition of fine fibers to the surface layer reduces the pore size and porosity of the filter material, improving its filtration accuracy. The resulting primary dust layer is relatively thin, making it easier to clean and resulting in a high dust stripping rate. Ensure emissions are ≤
10mg/Nm
Requirement of ³, expected to be achieved
6-8 mg/Nm
About 3. use
PPS+PTFE
Composite fibers enhance the antioxidant, chemical, and chemical properties of the filter material.
2
Enhancement of dust removal performance of filter media. The dust facing surface adopts a gradient filter material structure to enhance the cleaning ability of the filter material, reduce the operating resistance of the system and the strong loss of the filter material. The increase in system resistance is relatively small, and the system operation is relatively stable. This is the basic lifespan of filter media.
3
The increase in the strength of the filter material. Adopting reinforced type
PTFE
The base fabric reduces the strength loss of the filter material due to oxidation and instantaneous high temperature, and extends the service life of the filter material.
4
Enhance the corrosion resistance of filter media.
PTFE
After immersion treatment, the anti condensation ability of the filter material is improved, while the ease of cleaning of the filter material is also enhanced, the filtration accuracy of the filter material is improved, the loss of filter material compaction and corrosion strength is reduced, and the service life of the filter material is extended.
5
Folded cloth bag skeleton
Design requirements:
1
Durability: The production process is refined to ensure that the filter bag remains undamaged for long-term use.
2
Compatibility: It matches the size of the flower board without any dust leakage. Using a specialized wrinkled skeleton, the dust collector operates stably for a long time.
3
Increase filtration area: According to requirements, compared to pulse filter bags of the same specifications, the filtration area of a single filter bag can be increased
50-90
In order to achieve the goal of reducing the filtering wind speed.
VI
Folded cloth bag skeleton
Technical features:
1
Save a lot of manpower and material resources. No need to modify the overall bag filter or other related equipment, saving manpower and material resources.
2
Shorten the construction period. No need to modify the relevant equipment, the construction period is the filter bag replacement time.
3
Save space. There is no need to increase the volume of the dust collector or change the position of the flower plate to reduce the filtering wind speed.
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