Bag filter and electrostatic precipitator comparison

Bag filter is also called filter dust collector. It uses fiber woven bags to collect solid particles in the flue gas. Its dust removal efficiency is high. Generally it can ensure that the discharge concentration at the outlet is less than 50mg/Nm3, and the dust removal effect is the highest. It can reach 30mg/Nm3 or less.
At present, the newly-developed bag filter has a dust removal efficiency of 99.99% or more, and has achieved zero emissions of smoke and dust. The dust removal efficiency of the electrostatic precipitator is obviously lower than that of the bag filter, and it cannot be used for the cleaning of explosive dust. The application range is narrow.
Daily operation of bag filter; the entire bag filter is relatively stable operation, the structure is relatively simple, set up repair testing platform, maintenance personnel can always observe the air bag and bag usage on the bag filter platform, safety is good.
Electrostatic precipitators; automatic control is relatively complicated, high-pressure equipment is strictly protected, and boiler operation requirements are not high, but equipment management requirements are strict.
The effect of boiler system operation change on two types of dust collectors compares the change in the amount of flue gas produced by the boiler bag filter; related to the filter bag, as long as the filter bag is not damaged, the export concentration of the flue gas can achieve stable emission, ie less than 50mg/m3 Depending on the operating conditions of the system, the ashing method is automatically adjusted.
Electrostatic precipitators; dust removal efficiency fluctuates, and dust emission concentrations will fluctuate with grid voltage fluctuations, causing emissions to be unstable.
Boiler flue gas temperature change bag filter; flue gas temperature is too low will cause condensation, at the same time may cause paste bag and body steel structure corrosion, power plant will also produce high-voltage creepage; flue gas temperature is too high Heat deformation, while the dust's specific resistance increases, it is not easy to combine electricity, thus affecting the dust removal efficiency, and the impact is obvious.
Boiler System Leakage Bag Dust Collector: For poor oxidation resistance filter bags will affect the filter bag life, such as pps filter, so the flue gas content is controlled within 10%, but the dust removal efficiency is not affected.
Comparison of the initial investment of the two dust collectors (1) When the dust emission concentration of the dust collector meets the environmental emission requirements <50 mg/m3, the initial investment in the bag filter is about 10% lower than that of the electrostatic precipitator.
(2) Generally, when the dust emission concentration is less than 200mg/m3, the initial investment in bag filter is about 10% higher than that of electrostatic precipitator.
(3) The sum of sio2 and Al203 in fly ash is more than 90%. It is not suitable for the dust collected by electrostatic precipitators. In the case where the dust emission concentration is less than 200mg/m3, the initial investment in electrostatic precipitators is slightly higher than that of baghouse precipitators.
The two kinds of dust collector operating costs compared to the operation of power consumption bag dust collector: the main induced draft fan power consumption is high, the power consumption of cleaning system is low.
Electrostatic precipitator: The power consumption of the main draught fan is low, and the power consumption of the dust generated by the electric field is high. The total power consumption of the two dust precipitators is not much different. In general, the bag dust collector consumes more power than the electrostatic precipitator. To be low, the power consumption of the electrostatic precipitator is higher than that of the three electric fields.
Sewage discharge bag dust collector; soot emissions can be stabilized within the state requirements of soot emissions requirements, for circulating fluidized bed furnace calcium injection boilers also assist in desulfurization function, desulfurization efficiency increased by about 15%, sewage charges are small.
Electrostatic precipitator; China's current four-field electrostatic precipitator using the best emission concentration is also 80% / m3 or more, and unstable, each year to pay hundreds of thousands or even millions of sewage charges, this fee is no bag filter Made comparisons.
Comparing the above two kinds of dust collectors, the dust and bag dust collectors are more cost-effective than electrostatic precipitators in the same working conditions.