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The first step in designing and selecting a pulse bag filter is to understand the conditions of the dusty gas, including processing capacity, temperature, humidity, dust concentration, dust properties, etc., which need to be processed through a filter, and then design and select a filter. Piping system and Auxiliary equipment is the same as other dust removal equipment. These issues should be considered when designing and selecting a bag dust collector. The following is the introduction of the design and selection of several bag dust collectors .
Design and selection of bag filter 1. If the pressure loss lacks more suitable design experience, when the filtration speed is low, the pressure loss can be reduced to 75 × 9 .. 8pa as typical data. However, if a higher filtration speed or a sticky or low porosity dust layer is used, a slightly higher value should be used.
Design and selection of bag filter 2. Filtration rate. E. Cloth ratio. It is the ratio of the flow rate of the filtered gas (m3./min) to the area of the dust bag (m2), m3 / min. M2 = m / min. This is a unit of speed that represents the average speed of gas passing through a dust bag, regardless of the area occupied by the fibers that make up the fabric. Therefore, it is often referred to as "apparent surface speed."
Filtration speed is an important factor that determines the performance of a bag filter. If the filtering speed is too fast, it will cause excessive pressure loss, reduce the dust removal efficiency, block and damage the dust removal filter bag prematurely. However, increasing the filtration speed can reduce the filtering area required by the bag filter, so that the same volume of gas can be processed with smaller dust removal equipment.
For a certain set of design parameters (IE type of dust collector, dust removal mechanism, fiber material and fabric structure of the dust bag, dust removal performance, etc.). In general, the filtration speed of fine dust is lower than that of coarse dust. Small vacuum cleaners generally use higher filtration speeds than large vacuum cleaners. Pulse and reverse jet dust collectors achieve higher filtration speeds than vibratory and reverse airflow filters.
9m / min。 For vibration type and reverse air type dust collector, the filtration speed can be 0. 9m / min. From the perspective of investment and maintenance, it has been suggested that the maximum filtration speed of feed, grain dust and flour can be 0 .. 98 and 0.75 m / min, respectively.
Design and selection of bag filter 3. Divide the gas flow rate (m3 / min) into the filter area of the filter by the selected filter speed (m / min) to obtain the actual fabric area (m2). Due to changes in temperature and additional air, the volume of indoor dust gas entering the vacuum cleaner may not be the same as the volume discharged during the production process. If you use a vacuum cleaner with a change in flow rate, you need to determine whether the filter area is based on the peak flow rate or Calculated by the average flow rate. In addition, the storage volume of the dust bag for the dust collector should be considered for dust removal, inspection and maintenance.
Design and Selection of Bag Dust Collector 4. It is relatively easy to determine how many compartments a bag filter needs in the housing structure. After determining the dust bag area of each compartment, you need to determine the most suitable dust bag length, diameter, and arrangement spacing. The average length of the dust filter bag is preferably not less than 50 mm. Particularly long (for example, more than 3 meters) the distance between the dust filter bag should be large. Dust removal filter bags should be grouped, leaving channels between the two groups. If there is only one channel on one side, the diameter of the dust collection bag is 150 mm, and each group of filter bags must not exceed three or four rows. Each group has a diameter of no more than 300 mm and no more than two rows. If there are channels on both sides, 8 rows with a diameter not exceeding 150 mm and 4 rows with a diameter not exceeding 300 mm. The width of the channel is 450-600 mm. The total number of dust filter bags per group depends on the vibration mechanism used. Generally, a set of filter bags is operated by a set of vibration mechanisms. One compartment can contain several sets of filter bags.
Related recommendation: Working principle of bag dust removal equipment
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