1、 Introduction to the Performance of Dust Removal Bags Dust removal bags are a key part of the operation of bag filters, usually cylindrical filter bags suspended vertically in the dust collector. The fabric and design of the filter bag should strive for filtration, easy dust removal, and long-lasting effect. The characteristics of dust removal bags are significant due to the fineness of the fibers themselves. The irregular cross-section of the fibers increases the surface area of the fibers and provides many small pores, making the surface filtration effect better than filtration. Dust only stays on the surface of the filter bag and cannot penetrate the filter felt. Therefore, the backwash pressure is small, and the filter cake rebound efficiency is significant. It has a collection efficiency of fine powder particles and a small operating pressure difference. Dust bag; Made by using pure melt blown fiber filter cloth through geothermal melting or rolling. The filtration accuracy of a cloth bag is usually the nominal filtration accuracy. Cloth bags have excellent chemical stability and heat resistance, and are representative of applications in the filter material industry. They are also the most commonly used type of filter material in terms of performance, achieving high levels of filtration efficiency and accuracy. 2、 Measures to prevent damage to dust removal bags: 1. The pulse nozzle should be vertical and concentric with the flower plate hole, with an error of less than 2mm. 2. The flower board is flat and the inner surface of the flower board holes is smooth. There is a large distance between the flower board holes and the box wall to prevent errors in the flower board and tilting of the skeleton, which may cause collision between the filter bags and wear of the filter bags. 3. The number of vertical bars in the skeleton should be reasonably matched according to the material of the filter material, and should be smooth, flat, and free of defects, with sufficient strength, verticality meeting industry standards, and well matched with the filter bag. 4. There should be a distance between the bottom of the dust removal bag and the ash hopper, and there should be a high and low level gauge inside the ash hopper. If there is too much ash accumulation in the ash hopper, it should be unloaded in a timely manner. 5. Before installing the cloth bag, the site should be tidy, and facilities such as the filter bag skeleton and spray pipe should be arranged in an orderly manner. Impurities in the dust removal equipment should be cleaned up, and the installation process should be orderly, without any cross operations that may affect the installation of the filter. 6. The dust collector requires the installation of an airflow distribution plate to ensure a relatively uniform distribution of airflow in each box. The position and quantity of the airflow distribution plate have a significant impact on the airflow distribution. 7. The preventive measure for possible sparks in the flue gas is to install a spark trap before the flue gas enters the dust collector to remove the sparks from the flue gas. 8. After the installation of the dust removal bag is completed, the bag should be pre sprayed with lime powder and talcum powder before the dust removal equipment starts operating. The effectiveness of using dust removal bags is not only related to the quality of the bag itself, but also to the reasonable design of the dust collector, as well as the installation, operation, and maintenance of the dust removal bag. 3、 Cleaning of Dust Removal Bag 1. Dust Removal: High frequency vibration is used to remove larger dust particles that enter the bag wall as much as possible, without affecting the entanglement fastness of fibers, and maintaining good peel resistance of the bag. 2. Chemical experiment processing: Extract bag samples, use instrument analysis to detect the composition of oil stains in the bag, select appropriate washing materials, and thoroughly clean the bag without causing any damage. 3. Cleaning: Select suitable washing materials and strictly mix them, clean with low-temperature water, ensure even water flow, moderate strength, and no mechanical damage to the cloth bag. 4. Drying: Using hot air at around 110 ℃ to dry, maintain the dimensional stability of the bag, and prevent deformation and shrinkage of the bag after drying. 5. High reuse rate for damaged cloth bags caused by abrasion, holes, etc. due to use. 6. Testing: Physical indicators of the cleaned cloth bag are tested using instruments to ensure that the cleaning quality meets the requirements. After the above processes of processing and cleaning, the cloth bag can meet the requirements for use. 4、 Characteristics of dust bag: 1. Significant temperature resistance: Long term use temperature of 260 ℃, with space to cope with downtime and unexpected events. 2. High temperature dust removal bags can be made of cotton wool fibers, glass fibers, or various chemical fibers that are woven (or needle punched) into filter materials, and then sewn into vertically suspended filter bags. Different filter materials should be selected for different occasions. The dust collected on the dust removal bag is deformed by periodic mechanical shaking, filtered flue gas blowback, or compressed air pulse blowback, etc. The use of high-temperature dust removal bags accounts for a large proportion of the maintenance cost of dust collectors, up to more than 70% of the maintenance cost. The basic situation is wear, burning, corrosion, etc. The factors that affect the service life of high-temperature dust removal bags are as follows: improper use of the type of dust removal bag; The quality of dust removal bags; Filter gas velocity; Dust load; Dust composition; Dust characteristics; Cleaning method; Cleaning frequency; The number of system startups, shutdowns, and related maintenance work.
