Dust bag quality appraisal

dust bag is a kind of filter material, usually made of fiber or polymer. Its surface is densely covered with countless small pores, which can filter out harmful substances such as dust and smoke in the air to protect the working environment and workers' health. Dust removal bags are widely used in factories, workshops, coal mines and other places that require air purification and dust removal. The working principle of
dust bag is to pass the air containing harmful substances such as dust and smoke through the filter bag. Because the pores in the filter bag are relatively small, it can filter out the mist droplets and particles, thereby achieving the purification effect. Better dust bag materials can keep the air in the bag in a fresh state, which can effectively reduce physical harm to workers. When purchasing dust bags, you also need to choose products with reliable quality to avoid problems caused by low-quality dust bags.

GB/T 6719-2009 Technical requirements for bag dust collector
GB/T 27869-2011 Electric bag composite dust collector
GB/T 32154-2015 Performance test method for electric bag composite dust collector
GB/T 33017.4-2016 Technical requirements for evaluation of high-efficiency air pollutant control equipment Part 4: Electric bag composite dust collector

The dust removal efficiency of the bag dust collector being used by a company did not meet the standard, and the filter bag was broken. An appraisal agency was specially commissioned to conduct a quality appraisal of the dust bag. The
expert team arrived at the site for investigation. Through on-site inspection and analysis of the manufacturing process, they believed that the number of filter bags configured was too small, resulting in a small total filtration area, resulting in a large filtration wind speed, reducing the efficiency of the dust collector and aggravating bag wear:
1. On-site investigation: DCS data was retrieved on-site to check the smoke and dust parameters at the inlet and outlet of the bag dust collector. Refer to GB/T 6719-2009 "Technical Requirements for Bag Dust Collector" and other standards to detect the smoke and dust concentration at the inlet and outlet of the bag dust collector and calculate the dust removal efficiency. Static inspection of the appearance of the dust collector. Check the number and configuration of filter bags inside the dust collector. Sampling the filter bag for testing;
2, appraisal opinion: Through on-site investigation, it was confirmed that the dust removal efficiency did not meet the standard, the current status of the filter bag was recently replaced, and the sampling test results showed that the material and specification model were consistent with the technical agreement. Based on the information obtained from the on-site investigation, a total of 207 bags are equipped with the bag dust collector. If the filter wind speed of the bag dust collector is too fast, it will accelerate the secondary flying of the dust, destroy the first layer, and reduce the dust removal efficiency. On the other hand, the friction of the dust will cause the wear of the filter bag to increase. According to the calculation formula, the total number of bag dust bag configurations is theoretically calculated: the number of 207 bags equipped with the
involved dust collector is too small, and the total filtration area is too small, resulting in too high filtration wind speed, which will reduce the efficiency of the dust collector and aggravate the bag wear.