What is the reason that the filter bag is broken and the strength of the filter bag is decreased greatly in the cement plant?
The main reasons for the failure of filter bag are the following points:I. burning loss. The main reason for high temperature burning is that the flue gas temperature exceeds the maximum allowable temperature of the filter bag, and even smoke has an open flame.Two, corrosion. Bag filter was the most obvious feature of the corrosion damage for the overall strength of the filter bag is greatly reduced and the dedusting of the flue gas from coal-fired power plant is mainly composed of acid corrosion, oxidation and corrosion as a result of losing the bag can bear load, thus losing the filtering performance and failure.
Four, blocked. The main cause of bag filter bag jam failure is:1. oil mist blockage. Oil mist plug is mainly boiler start or low load operation of oil feeding, did not take protective measures or measures to protect the bag caused by imperfect, increasing the residual resistance which will lead to the bag, even with strong cleaning is difficult to solve this problem.2. dust blockage. Fine dust in the process of filtering bag filter in fiber bag can enter into the interlayer, but ash can't connect the intrusion inside the bag dust filter bag blowing out all outside, so after the operation of the residual resistance of bag Months and years pass by. will continue to increase, in addition to low load boiler precipitator long time not clear ash would lead to this problem.3. dew paste bag. Condensation is a relatively common phenomenon of bag dust collector, refers to the wet gas in the pressure and temperature of the precipitation water saturation phenomenon, precipitation water temperature is called the dew point, saturated gas pressure the higher the dew point is low, the air humidity is high, the dew point temperature is high, when a certain amount of water in the air wet, wet gas is lower than the dew point temperature, the saturated water will precipitate in the air, namely producecondensation.
Three, wear. There are three reasons for the bag filter wear:1. uneven distribution of air flow. Uneven distribution of air flow results in high velocity scouring of filter bags with dust smoke, local wear of filter bags and lower service life.2. flue gas filtration rate is high. Excessive filtration rate of the flue gas will cause frequent soot cleaning, and the fabric, fiber, especially glass fiber of the filter bag will be damaged easily.3. filter bag spacing is too small. The wearing of the lower part of the filter bag is a common phenomenon. The wear is on the one side, the lower part is the most serious, and it gradually decreases. The local sewing thread will be worn off.
