JLDC shaft Development and Application of bag filter
Abstract: The shaft kiln in the clinker burning process, produce large amounts of dust smoke. As the shaft kiln particular condition, its treatment quite difficult. The vast majority of shaft manufacturers, due to its financial constraints and conceptual reasons, investment in equipment, particularly sensitive to dust. New environmental requirements must be smoke-free shaft kiln dust emission, which is poor working conditions and low investment requirements of the formation of a strong contrast, but also on environmental protection equipment factory raised new challenges.
1, the characteristics of shaft kiln flue gas characteristics of shaft kiln operation is closely related to its calcination, sintering process, or occur among the various kiln conditions are not normal to the normal operation of dust collectors has created a significant obstacles shaft kiln features are:
1.1 dust and volatile as the plants of different firing process, resulting in considerable fluctuations in the concentration of dust, manufacturers generally only 5-15g/Nm3, if the ball plastic material difference, fire operations, smoke and dust in the dust concentration is often more than 30g/Nm3. With different conditions, dust particle size, specific resistance, also have great changes.
1.2 large gas humidity, dew point temperature, high-shaft kiln, it should be through the water into a ball, burning ball in the water when the material is evaporated, along with the flue gas exhaust, thus shaft kiln of the moisture content is large, generally fluctuated between 8% -20%. Humidity resulted in very high flue gas dew point, usually around 45 -55 . When high-sulfur coal or sulfur mineralization agent, its dew point will rise. As the flue gas containing SO2, HF, CO2 and other components, once the dew condensation will generate acid, very corrosive to metal.
1.3 large shaft kiln flue gas temperature fluctuations of temperature fluctuations in large, generally fluctuated between 45 -250 , when the encounter to mention the fire, fire the kiln, which are not normal conditions, the temperature rapidly increased to 400 .
2, common shaft kiln dust removal equipment
2.1 Wet Wet dust collector on the shaft kiln dust adaptability, cost and low operation cost, but actual effect of view, little can really substandard. The reason, mainly: shaft kiln dust contains many hydrophobic and difficult to capture by water droplets, can easily be out of gas; the surface tension of small particles as large, the surface film layer of Absorption , droplet difficult to break through film, so that each particle absorption and condensation. Wet dust filter on the 5 m below, the collection is very poor; Dust gas emissions but also bring out a lot of dust droplets. In addition, uneven ventilation, shell corrosive, easy to plug the nozzle, the second has been the impact of pollution, dust effect, impede the promotion of wet dust collector one of the reasons.
2.2 ESP ESP is a highly efficient filter, but has been always in the shaft kiln dust can not achieve satisfactory results. Mainly because: shaft kiln temperature and humidity changes, electric resistance has changed dramatically, often beyond the dust of the allowable range, causing the accident emissions; gas condensation of acid corrosion on the electrical dust collector obvious directly affect the normal operation of equipment; high temperature, the plate deformation, impact effect of dust collection; humidity, low temperature condensation prone to insulator creepage and affect operation. Although for the kiln, each manufacturer has launched intensive field vertical, vertical tube, no power, wet electrostatic precipitators, etc., but really very few long-term use of discharge standards.
2.3 bag filter bag filter dust biggest advantage is high efficiency, adapt to wide range of dust concentration, and the impact from electric resistance, shaft kiln flue gas with dust collector, as long as the design selected Type reasonable, making no defects, to achieve the emission standards of less than 100mg/Nm3. Currently there are LFEF more motivated to use air cleaning, SKB into the air under the jet pulse filter cleaning and so on, but there are big investment, more than the point of failure, filter bag life and short defects. JLDC cylindrical shaft successful development of bag filter, bag filter to solve the current existing structure is irrational, high investment, high running costs, poor sealing bag, short life, "paste bag", "burn bag ", uneven flow problems, with very good results.
3, JLDC cylindrical bag filter bag filter JLDC Development of the anti-hair in a traditional filter based on the characteristics of shaft kiln, bold innovation, research and design a new type of bag dust. The purpose of the development of four dust: structure should be compact, to reduce equipment weight and reduce the cost of dust; design should be reasonable, take full account of maintenance, installation and other issues; better than to use and extend the life of bag ; operation should be simple to minimize moving parts, reduce the failure rate. This author JLDC design process considered the following main points:
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