Bag dust collector is an efficient dust removal equipment for air pollution control and is widely used. Under the current high pressure of environmental protection, how to improve dust removal efficiency is a problem that every enterprise should consider. The dust removal efficiency of bag dust collector is mainly affected by factors such as dust characteristics, filter material characteristics, accumulated dust load on the filter bag, and filtration wind speed.
1. Filter bag material
The selection and application of filter bag materials for bag dust collector is the core technology of bag dust collection equipment and plays a decisive role in the performance of dust collector. Due to the different environments of various dust collection points, the nature, temperature and technical requirements of dust treatment are different. Different filter materials should be selected for different conditions and corresponding technical protection measures should be taken.
The requirements for filter bag materials include the following technical properties: filter bag materials are suitable for different temperatures, good stripping properties, easy to clean, good air permeability, low resistance, high filtration efficiency, high strength, can withstand high-intensity cleaning, long service life, and suitable price.
2. Filter wind speed
The filter wind speed is a very important parameter that determines the performance of the dust collector and is also an important parameter for measuring the advancement of bag dust collectors. The filtration wind speed is closely related to the dust concentration of the dust-containing gas, the size of dust particles, the application occasion, viscosity, gas temperature, moisture content and cleaning method.
When the dust particle size is fine, the temperature and humidity are high, the concentration is large, and the viscosity is large, the filtration wind speed should be lower, otherwise a high value can be selected. If the filtration wind speed is too high, it will increase the load of the filter bag and increase the filtration resistance, resulting in a short service life and low efficiency of the filter bag.
3. Air leakage
Air leakage directly affects the dust collection effect and life of the dust collector, and the air leakage rate is required to be <3%. Bag dust collectors generally operate at negative pressure. If there is air leakage, it is easy to form a small loop short circuit. The dust collection system does not handle enough air volume, forming positive pressure dust. Air leakage will also reduce the system temperature, easily form moisture and stick to the bag, increase the dust collection resistance, and reduce the dust collection effect.
4. Ash discharge
The ash hopper cone is not well discharged, and there is too much ash in the ash hopper, which blocks the air inlet and causes poor ventilation.
5. Cleaning interval
If the cleaning interval is too long, the dust attached to the filter bag cannot be removed in time, causing the system resistance to increase. The general interval is about 4s (can be adjusted according to the actual production situation), the blowing time is 0.2s~0.3s, and the time interval between rooms is about 30s.
6. Leakage
The top and surrounding walls of the dust collector have serious air leakage, and water will enter when it rains, causing the bag to stick, or the wet material will form a mass and block the ash discharge port of the cone.
7. Insulation
Dust collector insulation is also a must for bag dust collectors. Insulation is to maintain gas and avoid moisture sticking. Most filter bags are smeared and blocked, which is caused by low dust temperature and high humidity.
In view of the above factors, regular inspections, timely resolution of fault hazards, and ensuring stable operation of the dust collector can effectively improve dust removal efficiency.