How to extend the life of fiberglass dust bag?

Q:How to extend the life of fiberglass dust bag?

A:First, the design should pay attention to the problem Long bag low pressure pulse bag filter filtering speed, select pulse cleaning air volume and pressure, gas humidity, inlet dust concentration, into the wind, up wind speed, cleaning methods on the bag, and other factors. 1, the low pressure long bag pulse dust collector filtration velocity: One of the important parameters of bag filter filtration rate, and the dust concentration in the treated gas, dust cloth cleaning method and material properties used is closely related to the size of the filtration rate directly affects the entire precipitator volume size, and impact resistance to the bag filter system, thus affecting the life of the filter bag. After using coated glass fiber filter bag, because it is the surface of the filter, and does not accumulate dust leaving the bag in the deep resistance gradually increase, so in the same circumstances, than without filtration membrane bag high wind speed. Bag filter resistance and the square of the wind speed, if the wind speed is too large will make the initial resistance is too large, it will cause a partial “perforation” phenomenon in the film, thereby enabling the fabric being worn affect emissions and life. As a result of the surface treatment, the bag is not deep fouling, and the use of pulse cleaning, the kinetic energy of the larger, more thorough cleaning, the resistance will not rise soon, so this is no film coating representing wind speed Some reasons. 2, pulse cleaning air volume and pressure selection: Long bag low pressure pulse bag filter during pulse cleaning, in addition to the selected pressure lower than the conventional pressure cycle lengthened, the cleaning must determine the appropriate amount of wind, too much easy to reduce the service life, small cleaning is not complete also affect life expectancy. Cleaning at the same pressure, the same volume, the offline cleaning pressure than the low-line cleaning, and air consumption, save power. 3, Gas Humidity: Wet fiberglass filter bag, its strength is decreased, which is due to the alkali-containing glass in the alkali component is dissolved in water, resulting in erosion of the surface of the glass, and the film off, and affect the life. Therefore, apart from limiting the maximum temperature of the working gas, the use of fiberglass bags special attention to control the humidity, prevent condensation, such as dry kiln fiberglass bag filter, mixing is due to the current conditions, ie a large number of raw mill exhaust gas into the humidity increased, if not control humidity and air leakage caused by condensation of water vapor in the bag, also affect life expectancy. 4,The inlet dust concentration: Processed gas bag filter, the concentration of dust the size of a direct impact resistance and service life of the bag, the thicker the surface of the bag filter attached to the dust layer, the greater the resistance, the use of the filter bag life greater the impact. On the other hand, in order to promptly clean the dust layer thickness, is bound to strengthen the filter bag cleaning, cleaning cycle is shorter (than the membrane filter media is not covered media cleaning cycle length), increase cleaning the frequency of cleaning and extended duration of action, which is bound to increase by the mill bag, breakage and affect their life. Appropriate to reduce the inlet dust concentration for extended filter bag life and improve working conditions throughout the precipitator is advantageous. 5, Into the wind: The current design long bag low pressure pulse bag filter, the use of which into the wind, it will directly affect the life of the filter bag is mainly reflected in: air flow uniformity. Evenly between first chamber and the chamber, followed by the uniformity of the hopper into the entire chamber. Inlet pipe directly into the hopper, horizontal pipe should be avoided to prevent fouling, and shall be carried out in advance dust hopper to prevent erosion of the role of direct bag to prolong bag life. 6, Up wind speed: Low-pressure pulse bag filter cleaning by cleaning methods can be divided into online and offline cleaning. Online cleaning filter is in the same time, while the state of cleaning, twice prone to dust dust to reduce cleaning efficiency, affecting the life of the bag. When cleaning line, based on experience, the bag chamber rises wind speed should be controlled within 1.5m / s. When the off-line cleaning, because it is out of a bag house after closing the damper, stopping the filtering carried out cleaning work, so it does not produce secondary dust, and can protect the bag, but due to the need to increase costs and cause compartment passive resistance .