Catalog
1. Material Difference Between Hot Gas Metal Filter Bag and Dust Filter Bag
2. What Pretreatments Are Required for Hot Gas Metal Filter Bag and Dust Filter Bag
(1) Temperature Pretreatment
(2) Denitrification Pretreatment
(3) Electrostatic Pretreatment
3. Comparison of Other Advantages and Disadvantages Between Hot Gas Metal Filter Bag and Dust Filter Bag
(1) Dirt Holding Capacity
(2) Efficient/Working Resistance
(3) Filtration Precision Accuracy and Efficient
4. Replacement and Equipment Work Efficiency of Hot Gas Metal Filter Bag and Dust Filter Bags
5. Application of Hot Gas Metal Filter Bag and Dust Filter Bag
Conclusion
1. Material Difference Between Hot Gas Metal Filter Bag and Dust Filter Bag
Hot gas metal filter bag is made of metal materials, including filter part and internal support frame. The filter part is sintered fibers with materials such as stainless steel 316, 316L, 310S, etc. It is used for 450℃ high temperature gas dust removal.
Dust filter bags are sewn and processed by fiber needle felt of different materials, including PE, PP, PPS, Nomex, PTFE, etc. They are generally used for low temperature and high temperature gas treatment. Usually, high-temperature gas does not exceed 300℃
2. What Pretreatments Are Required for Hot Gas Metal Filter Bag and Dust Filter Bag
(1) Temperature Pretreatment
Hot gas metal filter bag needs to control the temperature at 450 degrees. It doesn’t need long pipes to reduce dust temperature.
Dust filter bags need to control the temperature within 300 degrees. This requires the introduction of cold air and the extension of pipes to achieve the purpose of cooling. The equipment occupies a large area. If the temperature is not well controlled, the bag is easy to burn. In addition, after the dust removal is completed, large particles of dust gather in the hopper, which also easy to cause burning.
(2) Denitrification Pretreatment
Hot gas metal filter bag can perform denitrification treatment while removing dust. That’s to say, customers do not need denitrification pretreatment. A set of denitrification equipment costs tens of thousands of dollars, and this equipment cost will be saved.
Dust filter bags need to be pre-treated for denitrification, and the equipment needs regular maintenance, which has high maintenance costs.
(3) Electrostatic Pretreatment
Hot gas metal filter bag is conductive and can avoid explosions caused by dust.
Dust filter bags must be pretreated with electrostatics. These bags are also flammable and can easily cause explosions.
3. Comparison of Other Advantages and Disadvantages Between Hot Gas Metal Filter Bag and Dust Filter Bag
(1) Dirt Holding Capacity
Hot gas metal filter bag is sintered by metal fibers. The sintered fibers are honeycomb porous structures with large dirt holding capacity, with uniform pores and high precision
Dust filter bags are knitted felt structures with lower dirt holding capacity, with uneven porosity.
(2) Efficient/Working Resistance
Hot gas metal filter bag has high porosity, low resistance, high flux. The fan power is lower. Customers could save cost on it.
Dust bags have low porosity, high operating resistance, and require high-power fans to deliver air. The cost is higher.
(3) Filtration Precision Accuracy and Efficient
Hot gas metal filter bag with higher precision, high strength, and low emissions can be produced according to customer requirements, achieving emission targets in one go.
The filtration accuracy of dust filter bags is generally 5-10um. If the dust removal does not meet the standard, secondary dust removal and filtration are generally required.
4. Replacement and Equipment Work Efficiency of Hot Gas Metal Filter Bag and Dust Filter Bags
Hot gas metal filter bag does not have burning and sticking phenomena. Generally, they can be used for more than 5 years. The equipment operates stably, cleans dust regularly, and saves maintenance costs. The equipment has high work efficiency
Dust filter bags are prone to burning and blocking. Generally, factories will have extra inventory for replacement. Usually, the bags are replaced every 6 months. That causes downtime long and affect equipment working efficiency.
5. Application of Hot Gas Metal Filter Bag and Dust Filter Bag
Hot gas metal filter bag is usually used for high-temperature dust removal 450 degrees, such as boilers, cement, metallurgy, biomass power generation, alumina, etc.
Dust filter bags are generally suitable for low-temperature and dust removal environments not exceeding 300 degrees, such as in chemical, electronic, chemical fiber, ceramic, cement, building materials, steel and other industries
Conclusion
Hot gas metal filter bag has more advantages in high temperature dust removal. We Filtalloy company has skilled team to suggest the siutable filter bags according to your working situation. If you have the questions, pls contact us.
