People will think of dust bags to completely replace the existing electrostatic bag house, bag dust itself but there are also running resistance is too large, the use of the bag are more bulky and other shortcomings. 24 ESP and bag dust is present limitations electrostatic bag house has the following limitations: 1) To ultrafine particles ( PM 2 5) limited trapping capacity. This is mainly because ultrafine particles are difficult to charge the electrode rapping secondary dust easier to make fine particles have been trapped to escape. 2) Removal efficiency is dependent on many factors (smoke temperature, flue gas velocity, characteristic of fly ash, sulfur, etc.) influence, fluctuations; large difference of coal, the same units due to certain factors may also transform coal, which is the electrostatic bag house stable and efficient operation caused a great impact. 3) The State shall strengthen the control of sulfur dioxide emissions, reduce the concentration of sulfur dioxide in the flue gas so that soot than resistance increases, resulting in enhanced electrostatic bag house back corona, reduce collection efficiency. Bag filter, there are some limitations, in addition to running resistance and other issues mentioned above, as well as the life of the filter bag (paste bags, burn bags, bags leak and corrosion and wear affect the life of the bag, despite the current filter We have made great progress), how to make the life of the bag as long as possible to reduce the number of replacement bags, reducing ongoing maintenance costs are a hot area of current research. In the design stage bag dust filter according to the choice of appropriate nature of the flue gas to be treated can be avoided paste bag and burn bags (for some large bag filter adds some such as bypass flue, emergency warming cooling auxiliary facilities security measures to increase the safety factor of its operation), but due to the adhesion of the dust cake on the bags must be removed to allow regeneration of the filter bags and thus cleaning the filter bag is essential, more thorough cleaning as possible, in favor of dust stable continuous operation. On the one hand must make a thorough cleaning bag occur excitation, wind speed and dust particles on the filter bag pondering the other hand, these two aspects of the life of the filter bag to play a major impact. How to minimize cleaning frequency and large particles of dust on the surface of the bag pondering become the key as long as possible the life of the filter bag. Therefore, under the ESP and bag dust removal technology are mature conditions, can learn from each other to form a new integrated electric dust bags composite technology.
