Introduction to the production of dust removal bags: Let me tell you that the production of dust removal bags is crucial because each step in the production process is related to the future service life. Let's learn about the production procedures. If a pressure drop of 3000-4000Pa is used, it is very beneficial for cleaning the dust removal cloth (filter) bag. However, the cloth (filter) bag and the joint will quickly be damaged. The lower the pressure drop, the longer the service life of the cloth (filter) bag. However, this is not the case in reality. If the pressure drop is low and the dust is fine, it will shorten the cleaning cycle and increase the frequency of cleaning, which will also affect the service life of the dust removal cloth bag. Practice has proven that controlling the pressure drop at around 1500Pa is beneficial for both cleaning efficiency and prolonging the lifespan of the filter bag. The production quality of the back cloth (filter) bag cap, clamp, and short tube: The production quality of the bag cap, clamp, and short tube will also directly affect the service life of the cloth (filter) bag. These accessories should be smooth and free of burrs during production, and the flanges should be rolled out to prevent the bag from falling off. The clamps should also be made of stainless steel, which should be easy to install and fasten. It is often found on site that these accessories are worn through at the contact point with the cloth (filter) bag, far below the expected lifespan of the cloth (filter) bag itself. Especially for dust collectors, the longer the filter bag, the greater the air volume processed by each bag, and the higher the inlet wind speed of the filter bag, resulting in more severe wear on the bag mouth. A certain factory used a fine grinding wheel to polish the bag cap and short tube in direct contact with the filter bag, in order to extend the service life of the cloth (filter) bag and reduce the wear of the bag mouth, and achieved significant results. In addition to paying attention to processing quality, it is recommended to use rubber pads at the contact points between the bag cap, clamp, short tube, and filter bag, which is estimated to extend the life of the cloth (filter) bag. Our company produces dust collector accessories such as bag caps, throat clamps, and short tubes, with complete processing technology that improves processing quality and extends the service life of cloth (filter) bags. Method for selecting dust removal bags: Select the filter bag according to the dust removal method of the dust collector. The chamber back blowing type bag filter adopts a chamber structure and uses valves to switch chamber by chamber, forming a reverse airflow back blowing to shrink or expand the filter bag for dust removal. It can be divided into two states and three states, with a cleaning frequency of 3-5 times/h. The cleaning power comes from the allowable pressure of the dust collector body, and is only equipped with reverse blowing power in specific situations. Belonging to the low kinetic energy ash cleaning type, the filter material should be a thin filter material with soft texture, easy deformation, and stable size, such as 729 and 208 filter materials. The filtering speed is equivalent to mechanical vibration. The material and sewing quality of the secondary cloth (filter) bag: The material of the dust removal bag itself will play a decisive role. As glass fiber filter bags require treatment with silicone oil and polytetrafluoroethylene, it is equally important to ensure that the treatment process is carried out as required. When sewing cloth (filter) bags, the stitching itself also needs to be treated, and it is required to use the same material as the dust removal cloth (filter) bag in order to ensure the overall service life of the filter bag. The glass fiber cloth (filter) bag selected by a certain factory was put into operation for several days, but serious dust leakage was found. After inspection, it was found that the problem was caused by the material of the sewing thread and the lack of specialized sewing equipment, resulting in bag breakage. In addition, the support ring should be made of stainless steel, and the sewing method also has a significant impact on the service life of the dust filter bag. Measures to extend the lifespan of filter bags: 1. Use bag cages with reasonable structure, smooth surface, and processed to meet standard requirements. The size of the filter bag should match the bag cage, the spacing between the flower plate holes should be appropriate, and sharp tools should be avoided during installation. The bag cage and filter bag should be installed vertically without bridging or collision. Spray pipes, nozzles, and Venturi tubes need to be installed accurately. Adjust the skewed spray nozzle and deformed flower board, with the spray nozzle facing the center of the filter bag mouth. 2. Adjust the injection pressure and pulse width to avoid excessive injection pressure. 3. For smoke with strong abrasion and high dust content, the filtration wind speed should be around 1.0m/min. The filtration wind speed of the electrostatic bag filter is about 1.2-1.3m/min, and the filtration wind speed of the bag filter with high dust concentration should be less than 0.8m/min. 4. The temperature of the flue gas shall not exceed 160 ℃, and the air leakage of the flue and dust collector shall be controlled and reduced. The oxygen content of the flue gas shall be controlled below 8%. 5. The temperature requirement for the dust collector is to be at least 20 ℃ higher than the acid dew point temperature. If it is lower than the acid dew point temperature, an alarm should be triggered in a timely manner and the dust collector system should be shut down. 6. In the cold winter, it is necessary to keep the dust collector insulated, check and eliminate the air leakage of the dust collector. 7. During short-term shutdown, the bag filter should have acidic gas inside and maintain the temperature of the dust collector above 100 ℃. The filter cake of the heated dust collector system should be dried, and the feed inlet should be kept in a heated state. Before long-term shutdown, continue to clean the dust for a period of time to reduce the dust on the surface of the filter bag. Close all baffle doors and remove the dust from the ash hopper, and reapply with pre coating. 8. The filter bag should be pre coated with CaCO3 with a particle size of 45 μ m through a pre coating system, with a pre coating amount of approximately 250-300g/m2. The role of dust removal bags in practical applications of bag filters: The operating principle of dust removal bags differs from other equipment. The dusty gas enters the expanded ash hopper of the dust removal bag for pre collection, and is evenly distributed between each filter bag through the guide plate. The dust is retained on the surface of the filter bag. In order to prevent the equipment resistance from exceeding 1200pa, high-pressure gas is sprayed through the electromagnetic pulse valve, causing compressed air inside the bag to be sprayed out through the nozzle holes (called primary air) and induced by the Venturi tube to enter the filter bag several times the primary air (called secondary air), causing the filter bag to rapidly expand in an instant and shake off the dust with the reverse action of the airflow, achieving the purpose of dust cleaning. Using a microcomputer automatic control device, adjust the cleaning cycle and pulse spraying time according to the dust concentration, so that the dust collector operates within the resistance range. When changing the dust removal bag, open the top cover of the bag and directly remove the filter bag, which is easy and convenient to maintain. The use of dust removal bags is mainly applied to bag dust collectors. The dust removal bags are installed in the air box and are mostly of the external filter type. The dust is collected in the dust hopper of the dust collector through the spraying of pulse solenoid valves. This is for the use of dust removal bags in standard bag filters. Simple bag filter, the dust bag is installed inside a simple frame. The installation mode of the dust bag is designed as an internal filter structure, which can convert the external pressure of the dust bag into internal pressure. This allows the shell of the bag filter to be in the form of a frame without the need for external iron plate sealing, saving costs and not hindering the use of the dust collector. The processing of dust removal bags is particularly important. In recent years, some small manufacturers have adopted small sewing machines as processing equipment, and used inferior thread as raw materials during processing, resulting in fake and fake products, and their processing level is far behind. Causing the dust removal bag to develop issues such as loose threads, cracks, and bottom drops shortly after use. Although a slightly smaller bag size can still be used, after adsorbing dust with a higher specific gravity, the bag will fall off after a period of use. The selection of dust removal bag fabric for dust media depends on the dust properties of the dust, taking into account whether the dust contains acids, alkalis, or highly corrosive substances. Select the appropriate filter material based on the nature of the dust, so that the filter bag can absorb the dust normally without affecting its service life. Accurately selecting the appropriate dust removal bag for the corresponding dust temperature is the key to the filter bag. If the temperature is too high, the selected dust removal bag will exceed the normal operating temperature. If the filter bag is light, it will shorten its service life, and if it is severe, it will burn out in a short period of time. Therefore, when selecting filter bags, it is necessary to measure and calculate the inlet temperature of the dust collector before selecting the corresponding dust bag.
