The dust removal technology for coal-fired boilers has evolved from water film dust removal, bag dust removal to electrostatic dust removal. With the increasingly strict environmental standards and the promotion and application of bag filters, the limitations of electrostatic precipitators are gradually becoming apparent.
The electrostatic precipitator (ESP), which used to be a benchmark in the industry, is no longer able to meet current demands due to high maintenance costs, poor adaptability to coal types, and decreased efficiency. The pulse jet bag filter, with a dust removal efficiency of over 99%, lower long-term operating costs, and automation compliance advantages, is becoming a better choice.
Why are electrostatic precipitators gradually becoming outdated?
1. Efficiency degradation issue
The initial 99% dust removal efficiency will decrease due to the following reasons:
- Coal type change (high specific resistance dust reduces ESP performance)
- Electrode corrosion and dust accumulation cause electric field distortion
- Actual emissions often exceed 100mg/m ³, facing the risk of fines
2. The "Electric Tiger" Challenge: High Operating Costs
- The power consumption is 3-5 times that of a bag filter (hence the nickname “electric tiger”)
- Frequent maintenance such as electrode replacement increases labor costs
3. Structural limitations and spatial requirements
Requires a large area of land and heavy steel frame structure
Complex high-voltage systems require maintenance by professional technicians
Technical advantages of bag filter
1. Excellent dust removal performance
- Stable maintenance of efficiency above 99.5%, unaffected by dust specific resistance
- Meets GB13223, Beijing ultra-low emission and EU Industrial Emission Directive (IED) standards
2. Lower Lifetime Costs
| Cost Factor | ESPs | Baghouses |
|---|---|---|
| Initial Investment | High (4-field ESPs cost ~20% more) | Competitive (declining due to localized filter production) |
| Power Consumption | 500-800 kW | 100-200 kW |
| Maintenance | Frequent electrode repairs | Automated pulse-jet cleaning (minimal downtime) |
3. Advanced filter media extends service life
FAQs: Baghouse Dust Collectors
Q： Can it handle high-temperature flue gas?
A： Ceramic fiber and metal mesh filter media can withstand high temperatures above 300 ℃
Q： What is the frequency of filter bag replacement?
A: 3-5 years with proper maintenance (vs. ESPs’ biannual repairs).
Q： Is a small boiler suitable?
A： Modular design can adapt to boilers of various scales
If you need to learn more about dust removal technology solutions for coal-fired boilers, please feel free to contact us at any time, and we will provide you with professional advice.
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