The rotary parachute electrostatic precipitator combines the characteristics of electrostatic precipitators and bag filters. It utilizes pre-dust collection and charging in the front-stage electric field, followed by filtering and dust removal in the back-stage filter bag area. It leverages the respective dust removal advantages of both ESP and bag filters, and combines the two to produce new performance advantages, compensating for the shortcomings of both. Due to its advantages in dust removal, low pressure loss, low maintenance costs, and low power consumption, the rotary parachute electrostatic precipitator has become a key device for dust capture, recovery, and gas purification. It is the primary and universal dust collection equipment for dust and smoke in the production processes of building materials and other industries. The rotary parachute electrostatic precipitator, with its advantages of stability, low filter bag resistance, long life, and small footprint, will be the primary technical means for the coordinated treatment of multiple pollutants such as fine particulate dust, PM2.5, and heavy metal mercury in the future.
Technical performance characteristics of rotary umbrella electrostatic precipitator:
1. Suitable for high specific resistance dust collection, the dust removal efficiency is stable: the efficiency of the electric bag dust collector is not affected by high specific resistance fine dust, coal type, and ash characteristics. The emission concentration can be easily achieved below 50mg/Nm3 and is long-term stable.
2. The operating resistance is 500Pa lower than that of pure bag dust collector, which can reduce the power consumption of induced draft fan. The operating resistance is 500Pa lower than that of pure bag dust collector, and the power consumption of induced draft fan can be reduced by 1.74KW for every 10000m3/h air volume.
3. Long cleaning cycle and low air source energy consumption: Since the filter bag collects a small amount of dust and the resistance rises slowly, its cleaning cycle time is more than twice that of a pure bag dust collector, and the compressed air consumption is less than 1/3 of that of a pure bag.
4. Extend the service life of filter bags
(1) Low operating resistance and small load differential pressure of filter bags extend the service life of filter bags.
(2) Long cleaning cycle and less cleaning times extend the service life of the filter bag.
(3) Under the same operating conditions, the service life of the electric bag is 2 to 3 years longer than that of the pure bag dust collector.
Factors affecting the rotary umbrella electrostatic precipitator
The influence of dust characteristics Dust characteristics include particle size distribution, true density, adhesion, specific resistance, etc. When the adhesion reaches a certain value, it will affect the cleaning performance of the filter bag and increase the initial resistance of the filter bag.
Flue gas properties primarily affect the lifespan of filter bags, including temperature, pressure, composition, humidity, flow rate, and dust concentration. Temperature and flue gas composition have the greatest impact on the lifespan of filter bags. Higher temperatures accelerate fiber aging, shortening the bag’s lifespan. Temperatures exceeding the bag’s tolerance can damage the bag. Furthermore, rising temperatures increase flue gas volume, increasing the bag’s filtration velocity and, consequently, resistance. High flue gas humidity increases dust surface adhesion, hindering bag cleaning. Avoid operating the dust collector below the dew point to prevent condensation and bag sticking. Furthermore, increased flow rate and dust concentration will also increase bag resistance.
The influence of structure: Electro-geometric factors affect the efficiency of the electro-zone. A reasonable bag area structure can avoid uneven damage to the filter bag, and a reasonable air path structure can reduce the pressure loss of the filter body. The airflow distribution structure between the two areas of the electro-bag will affect the stability and resistance characteristics of the filter bag.
The impact of operational factors requires proper voltage and current settings in the power zone, increasing secondary current to improve dust removal efficiency. A reasonable cleaning cycle should also be established. Overly frequent cleaning generates secondary dust, increasing resistance in the bag zone and the risk of vibration mechanism failure. A reasonable cleaning system should be established in the bag zone to meet operational requirements. Low cleaning pressure and long cleaning cycles will extend the life of the filter bags. Timely ash hopper discharge is crucial for stable dust collector operation.
