How to use and maintain dust bags correctly?

Filter bags have a direct impact on the efficiency of dust removal, so it is important to know how to use and maintain them correctly. High and low temperatures can also have an impact on the filter bag in appropriate circumstances. Filter bags are usually used to prevent the internal gas from cooling below the dew point, especially if they are working under negative pressure.

As air often leaks in from its shell, causing the temperature of the bag chamber to drop, making the internal gas temperature lower than the dew point, the filter bag is then subject to humidity and the dust does not appear fluffy, but sticks to the filter bag, blocking the fabric eyelets and causing the dust cleaning to fail, the pressure drop in the dust collector becomes large, too much pressure to continue running, and part of it also produces a filter bag that cannot be dusted.

Preventing dew condensation

Make sure to keep the temperature of the gas in the dust collector and its system everywhere above its dew point 25-35°C (e.g. the dew point temperature of the kiln mill is 58°C and the operating temperature should be above 90°C) to ensure the good use of the filter bag.

Take appropriate heating measures

If far-infrared electric heaters or electric heaters are set up in the dust collector, or additional heaters are set up in the bag chamber, the flue gas temperature of the main machine can be properly increased and the temperature monitoring of the dust collector and dust removal system can be strengthened in order to grasp the conditions of use of the bag dust collector and prevent dew formation.

Reducing air leakage

Leakage of air from some crevices of the dust collector body, leakage of air from the dust bag body should be controlled below 3.5%, leakage of air from process equipment in the dust collector system such as the closed ash discharge valve at the discharge port of the ball mill, leakage of the closed ash discharge valve under the dust collector, pipe flange connections, etc. These are often overlooked by maintenance managers, thus increasing the amount of unwanted air leakage and deteriorating the operating conditions of the baghouse.

Additional raw material stacking sheds

In cement production various raw materials, fuels and mixed materials have different water content, if placed in a fixed pile shed to prevent rain can greatly reduce the water content of the material, which is a measure to reduce the moisture content of the material, this is more common in cement plants in cities with more rain, but some of the material pile shed is too small, some are not, therefore, causing corresponding difficulties to the use of the bag filter.

Do a good job of insulation and rainproofing of the dust collector, pipes and other relevant parts, practice has proved that good insulation measures can make the difference between the inlet and outlet temperature of the bag filter very small, this is a measure to prevent dew condensation, dust-containing gases should be evenly distributed in the dust collector to prevent the emergence of vortices in the corners so that the amount of gas passing here is reduced to form a local low temperature and create dew problems.

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