What is the difference between electrostatic dust removal and bag dust removal
1. The bag filter can filter any kind of dust, and it is not affected by the dust properties. Electrostatic precipitator is more affected by the specific resistance of dust. When the specific resistance of dust exceeds 10Λ10Ω · cm (10th power of 10), the performance of the electrostatic precipitator will decrease as the specific resistance increases. Mainly because the specific resistance is too high, it is easy to form a back corona phenomenon, which reduces the efficiency of electric dust removal.
2. Electrostatic dedusting: Dust-containing gas is electrically separated when it passes through a high-voltage electrostatic field. After the negative charge of the dust particles and negative ions is combined, they are discharged toward the anode surface and deposited; Dust collection method. And bag dust removal: Dust-containing gas enters the ash hopper from the air inlet or enters the filter bag chamber through the open flange port. The dust-containing gas passes through the filter bag and is filtered to enter the clean air chamber, and then pass through the clean room exhaust port Finally, it is discharged by the fan.
Advantages of bag dust collectors: high dust removal efficiency, generally above 99%, simple structure and easy operation, at the same dust removal efficiency, lower investment than electric dust removal, insensitive to the characteristics of dust, large air volume treatment . Disadvantages are: suitable for working at high temperature, dust is easy to stick to the bag, which makes it difficult to clean the bag, increase resistance, premature failure and damage, and cannot be used in the case of condensation.
The advantages of electrostatic precipitator are: it is suitable for particle control, and its efficiency can reach 98% to 99%. It can process gases at high temperatures. It is suitable for large-scale projects. The larger the air volume, the more effective it is. obvious. In the electric precipitator, the energy separated from the airflow by the dust particles is not directly supplied to the airflow, but directly supplies the dust particles. Therefore, compared with other high-efficiency precipitators, the resistance of the electric precipitator is lower. The disadvantages are: huge equipment, large area, large steel consumption, large one-time investment, complex structure, high manufacturing and installation accuracy, and specific requirements for dust specific resistance.
The principle of electrostatic dedusting is that when the dust-containing gas passes through a high-voltage electrostatic field, it is electrically separated. After the dust particles and negative ions are combined with negative electricity, they tend to discharge and deposit on the anode surface.
The principle of bag dust removal is to filter the dust in the air by relying on the pores of the fabric (cloth).
The characteristic of electrostatic dedusting is that it can remove dust, especially very small dust and colloids (such as PM2.5), very cleanly. However, it is not very suitable for the situation of large particle dust and high dust density (usually a certain pretreatment is required); bag dust removal is characterized by good filtering effect on specific dust (such as flour) with known properties.