2.Bag filter is the most ideal dust removal system for asphalt mixing equipment.
The bag filter has proved to be an ideal dust removal system for asphalt mixing equipment. It can filter dust above 0.5μm, and the dust removal effect is good. The dust concentration can be less than 50mg/Nm3. At present, bag type dust collectors are available in three types: atmospheric back blowing, fan back blowing and pulse blowing. Atmospheric backflushing is to use the negative pressure of the system and the pressure difference of the atmosphere to make the atmosphere enter the bag for cleaning. Because the pressure difference is small, the cleaning power is small, so it is necessary to extend the cleaning time and increase the filtering area. The need for dust removal, the volume of the atmospheric backflushing dust collector is generally large; the pulse jet cleaning is to use high pressure air to blow the bag in a short time to shake it to remove the dust adhering to the bag, because the blowing time is very Short, and the blowing force is large, the dust adhering to the bag is easy to fall, and the short-time blowing and cleaning does not affect the operation of the dust collector. Therefore, the volume of the pulse jet dust collector is generally small, but needs to be configured. High-pressure gas source and pulse valve and other devices.
The main components of the bag filter are working under high temperature conditions for a long time, and because the sulfur, nitrogen and other components in the fuel form an acidic substance in the combustion process, the material of the bag must be resistant to temperature and acid. In addition, the rust prevention of the dust box is also very important. Due to the presence of elements such as sulfur and nitrogen in the fuel, it will become an acidic substance during the combustion oxidation process. After entering the dust box, it will corrode the inner wall of the tank, so it is required to be inside the tank. Apply anti-corrosion layer or make it with anti-corrosion material. The improvement of the new bag type dust collector technology focuses on how to improve the cleaning effect, corrosion resistance and oil proof and waterproof performance of the bag, such as changing the disturbance position of the bag and increasing the air volume of the pulse nozzle.
The bag filter has the following characteristics:
(1) The bag filter has high dust removal efficiency, the dust removal efficiency can reach more than 99%, and the removal rate of dust greater than 0.5μm is above 99.99%;
(2) It has a wide range of application and can be used for different types of asphalt mixing equipment. The air volume can be large or small;
(3) It has strong adaptability, flexible use and large operation flexibility. It can be used for different types of fuels such as diesel oil, heavy oil, impurity oil and coal, etc., and when the concentration of dust in the inlet gas changes greatly, Little effect on dust removal efficiency;
(4) Compared with the wet dust removal equipment, the dust can be recycled according to the size of the coarse and fine, and there is no sludge treatment problem or secondary pollution;
(5) Compared with other dust collectors, bag type dust collectors have no complicated auxiliary equipment and technical requirements, low cost and operation cost, and long service life. Therefore, the bag filter is the most commonly used asphalt mixing equipment and the most ideal dust removal system.