Long bag low pressure pulse bag filter design and analysis

Long bag low pressure pulse bag filter design and analysis 4.1 Explosion safety technology collecting dust explosion occurred in the separation device at. So long bag low pressure pulse bag dust collection technology itself is a major security measures, its application makes collecting equipment reduced by 1/2 to 2/3 (Dust in the exhaust), thus connecting the pipe and equipment leak points each also reduced, so that the possibility of a dust explosion ep reduced to conventional processes 33 to 50. in a conventional dry exhaust removal system flow, induced draft fan in between the first and second or second and third stages . Dust concentration where the gas is generally <15g / m3, the induced draft fan impeller and ep friction dust caused a risk of explosion. With this technology, the induced draft fan in a clean gas, this insecurity can be eliminated. Such as the use of general baghouse, often due to poor cleaning and the bag surface dust deposited too thick, prone to spontaneous combustion. And this technology has a powerful cleaning capability to avoid this danger. Using nitrogen as a cleaning gas source for non-combustible system uses compressed air. Use anti-static needle felt filter bag material, bag collector and piping system is reliable grounding, grounding resistance of grounding devices r≤48. Eliminate any possible fouling bag collector platforms and corners, not within the hopper ep allows accumulating dust. To prevent dust unloading equipment failure can not unload ash, cinder equipment for the implementation of automatic monitoring and fault alarm. On the bag collector box set explosion venting door. Taking into account some of the existing membrane vent door to vent burst pressure is not easy to master, and after opening vent air leakage, easy to cause an explosion likely to once again, so the design of the adjustable starting pressure (can be slightly positive start) and automatically restoration of explosion venting door. 4.2 pulse valve technology uses a straight-through pulse valve. The main parts of the valve is mounted directly on the gas regulator package, thereby reducing the pulse valve resistance. As the valve opening and closing fast, the required cleaning gas pressure is low, reducing the energy consumption of bag filters, and increase the role of gas from the pulse, so the bag filter bag length can be increased to 5 ~ 6m. When the injection pressure is reached when 0.15mpa, can meet the cleaning requirements. With pass-through pulse valve, injection pressure does not exceed 0.25mpa, injection time is shortened to 100ms or less energy consumption with anti-hair bag filter fairly; and if the traditional pulse valve, due to the large resistance of the valve, the required air pressure for the 0.5 ~ 0.7mpa, injection time is 100 ~ 120ms, pulse energy than the anti-hair bag filter bag filter high 60 to 70. straight pulse diaphragm valves are double-through structure <2>, which is double blow outlet lemniscate form. When the control device sends a signal to open the solenoid valve, small diaphragm movements to two relief cavity between the diaphragm and large diaphragm have been closed to stop blowing. This pulse valve diaphragm two throttling passage provided separately, will not interfere with each other when opening and closing, thus greatly accelerating the speed of the hoist. A pulse can meet 34m2 or more filter soot. Reducing the number of pulse valve. 4.3 ep dust bag material selection considering the characteristics and dust cake shedding capabilities, the bag having a wear-resistant material used in capacity and excellent in tensile strength polyester filament fabric 5 carbon fiber anti-oil, waterproof, anti-static polyester needle felt. Its breaking strength of 2.64 ~ 2.85mpa? min, ventilation volume 7.5m3 / (m2? min), operating temperature limit of 132 ℃ (above ep Drying System baghouse maximum operating temperature of 90 ℃) .4.4 filtered air speed select long bag low pressure pulse bag filter filtration gas velocity the size represents the size of the bag filter processing gas is the main indicators of the bag filter. Filter design and selection, the total volume under known conditions, we must first determine the gas velocity filter to determine the filter area. It is with the injection pressure, pulse time, the injection cycle, the nature of the dust, gas dust concentration and the length of the bag about the filtered gas velocity of the long bag low pressure pulse bag filter is designed to 1.0m / min.4.5 compressed air consumption determining the amount of long bag low pressure pulse bag filter air consumption depends mainly on the pulse duration and pulse structures. Each pulse valve injection time gas consumption qm with increasing injection pressure and pulse time increases. Compressed air consumption and the number of red valve and a valve blowing air consumption of each pulse is proportional to qm, t is inversely proportional to the pulse period. Typically, with the increase of gas velocity filter, the filter pressure loss increase rate greater than the growth rate of the pressure loss of the filter bag, which is the pressure loss due to the flare sake grow fast. In the current domestic several major art collecting bag, collecting the best of this technology, the maximum inlet concentration of pulverized coal, the lowest concentration of dust and exhaust, footprint and energy consumption to a minimum. Compared with the three and secondary dedusting process, system resistance decreased 2300pa and 1150pa, a substantial decline in energy consumption. Compared with air box pulse, due to the low resistance of the device, cleaning cleaning gas pressure is low and small, long cleaning cycle, which is currently low overall energy consumption 61. long bag low pressure pulse technology in the metallurgical, power, building materials and other industries It has been very popular, especially for coal preparation and coal as blast furnace injection of higher security requirements, operating conditions more demanding applications. 6 Conclusion For Eureka asphalt surface of unbound water, low softening point and other characteristics of the model experiments carried out its drying technology, and based on the experimental results amplifies used in engineering design, the ep drying system design finalized oscillating flow drying programs to achieve industrial production. Long bag low pressure pulse bag filter is the only section of the exhaust gas purification system, the entire system is negative pressure operation.