Corrosion is one of the most common causes of damage to the bag, because the flue gas contains a variety of corrosive substances, and corrosion in the high temperature environment is greater, which will cause damage to the filter bag. The main causes of corrosion are hydrolysis, oxidation, acid, alkali corrosion. Which mainly to hydrolysis, oxidation causes more damage, and less acid corrosion, alkali corrosion is less.
(1) acid and alkali corrosion
The main reason for the corrosion is that the flue gas contains acid and alkaline components, and the dew point changes with the change of the concentration of these chemicals. If the SO2 in the exhaust gas forms H2SO4 when the dust collector is turned on or stopped below the dew point, Causing the filter bag fiber hardening, deformation and thus lose strength and damage.
Corrosion damage traces are mostly radial, and in the filter bag surface to form a large area of discoloration, resulting in the filter bag hardened, brittle and a small amount of irregular circular holes, but with the Mars burn filter bag produced irregular circular hole is different Can be distinguished by the naked eye. Henan a magnesium oxide plant chlorination section of the flue gas content of HCl is very high, PTFE filter bag average life of less than 3 months, it was corroded enough to continue to use. Therefore, if the pulse cleaning bag in this condition, will accelerate the damage to the filter bag. In addition to acid and alkali corrosion, the organic solvent on the filter bag corrosion can not be ignored, such as waste incineration of some of the micro-substances in the filter bag damage, it can not make a reasonable explanation, because the content of these substances It is too low, low to even can not be detected, but they are real in the exhaust, the harm is great. Such as bromine vapor, although its content is minimal, but the damage caused by the filter bag is fatal.
(2) hydrolysis
Fibrous hydrolysis is the process by which water molecules enter into the fiber and react chemically with the polymer to break the molecular chains into new small molecules. Due to the smaller molecular weight, fiber tensile strength weakened and damaged. Synthetic fibers produced from polycondensation polymers are not resistant to hydrolysis. Such as commonly used polyester, Nomex and other filter is very easy to hydrolysis.
Only in the high temperature, humidity, chemicals, these three factors together to activate the molecules, the occurrence of hydrolysis. The higher the water content and the temperature in the flue gas, the more serious the hydrolysis of the bag. Different filter media hydrolysis temperature is not the same. Which P84 is currently used in the filter bag of a poor resistance to hydrolysis.
Hydrolysis traces of color turbidity, filter bag strength decreased, easy to break. After the sewing thread is hydrolyzed, the bag is cracked from the sewing thread so that the filter bag is no longer cylindrical. Filter bag sewing thread broken as shown.
(3) oxidation
Fiber oxidation is the process by which molecules in the fiber lose (or dissociate) electrons, such as PPS fibers, and "S" in the molecules of oxygen molecules at high temperature (150 ° C) and combine with them. Resulting in PPS fiber discoloration, hardening, brittle, reduced strength and damage, serious network will be broken and broken from the base fabric. Oxidation is another major factor in bag damage. Poor oxidation resistance of the filter are: polypropylene, polyphenylene sulfide (PPS) and so on.
浙江天台丰顿滤料有限公司是一家专业从事：液体过滤袋、工业滤布、滤布、滤袋、除尘袋生产销售的滤布厂家，多年来在液体过滤袋、滤袋、工业滤布、除尘袋生产上积累了丰富的经验和领先的技术。
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