Mixing and stirring technology in flue dust desulfurization equipment

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In the process of improving the economy of flue dust desulfurization equipment, gas mixing technology plays an important role. New gas stirring and mixing technology can * * Improve the economic benefits of flue dust desulfurization equipment. The gas mixing system developed by Ekato Mixing Equipment Technology Company can save equipment investment, production operation and maintenance costs. For power plant operators, this is very competitive. In traditional thermal power stations, sulfur oxides in combustion smoke are chemically reacted in wet filtration equipment to form calcium-based substances and are removed from the gas. ； Thereby reducing acid rain and reducing environmental pollution. At the bottom of the wet soot filtration equipment, the accumulated calcium-based substances must be converted into gypsum products again, and must be converted into gypsum products that meet the requirements for use in the construction industry. In order to achieve this purpose, a gas stirring and mixing device is installed at the bottom of the wet smoke filter equipment. ； It provides the oxygen required for the oxidation reaction from the air through gas mixing and stirring. ； The solid gypsum produced after the oxidation reaction should be retained in the lowest layer of the soot filter. Mr. Werner Himmelsbach, Head of Product Development and Application Technology at Ekato Mixing Plant Technology: “In flue dust desulfurization equipment, the function of the air mixer used has a decisive impact on the desulfurization effect and economy. ” Since the 1980s, as people's awareness of environmental protection has continued to increase and laws and regulations regarding smoke and dust emissions have become more and more stringent, more and more smoke and dust desulfurization equipment are used in enterprises. Ekato has developed its own unique products in flue dust desulfurization technology: Stirring device with air gas stirring and mixing system - Wingjet system. Its advent brought a revolution in flue dust desulfurization equipment. By 2000, about 80% of the modern thermal power equipment of large thermal power plants in the world had replaced this kind of flue dust desulfurization mixing equipment that can stir and mix the gas. The gas stirring and mixing system is installed on one side of the reaction tower and consists of a three-blade propeller. The air flow it sprays will not interfere with the gypsum material during the settling process. Long life and high efficiency The settlement of suspended matter in smoke depends largely on the content of solid matter in the smoke and the content of the smoke. One of the purposes of developing the new Wingjet gas stirring and mixing system is to extend the service life of the equipment. ； The prerequisite for extending the service life of flue gas desulfurization equipment is to improve the mechanical wear of the equipment. In this regard, Mr. Himmelsbach said: “After a series of detailed research and analysis and a large number of digital simulation tests, we finally found a suitable solution by drawing on experience in the aircraft manufacturing industry.: A pressure compensation shock absorber is designed on the top of the propeller blades in the advanced Wingjet gas mixing system to balance and compensate for vibrations caused by pressure imbalance when the air mixing system is working. ” After analysis and research, the Wingjet gas stirring and mixing system installed shock absorbing blocks on the top of the propeller blades. * * It reduces the vibration of the propeller during operation and fundamentally solves the problem of wear. Each propeller blade is cast individually and welded to the forged blade hub to form an integral air propeller. Compared with integrally cast propellers, the advantage of this split cast propeller is that: Different metal materials can be used to manufacture propeller components. The propeller blades can be cast from very wear-resistant high-quality steel, and the hubs of the propeller blades can be made from corrosion-resistant high-alloy steel materials. The cooling injection system manufactured according to this method has a long service life and low maintenance costs. Compared with the process technology of manufacturing propeller blades from steel plates, cast propeller blades have very high shape consistency and twist angle. Thus its hydrodynamic effect, i.e.: The ratio of input and output power of propeller blades has been raised to a new level. Another brand new effect is: There is better gas flow distribution in the oxidation reaction. The gas mixing technology used plays an important role in improving economy. The patented Wingjet gas mixing system has a hollow hub and three gas pipes mounted on the propeller shaft in front of the propeller blades. Air enters through the hollow hub and is discharged through three air pipes. At the transition between the hollow hub and the air pipe, a contact-free, wear-free, easy-to-maintain air distributor is formed. The cross-section of the outlet of the air pipe is not perpendicular to the axis of the air pipe, but is an inclined plane with a certain angle opposite to the rotation direction of the air pipe, so that negative pressure can be formed during rotation. The value of negative pressure is greater than the value of air flow loss in the air pipe, thereby preventing air leakage at the seal. The diameter of the air pipe is designed according to the maximum turbulence data of the propeller blades, thus ensuring the best dispersion effect and air utilization. The saving effect is obvious. The air distributor optimized in this way has high gas transfer efficiency and high air utilization under the same input power. After using this gas stirring and mixing system, the production and maintenance costs of air compressors are reduced. Especially for large equipment with a power of several megawatts, the savings in use and maintenance costs are even more noticeable. This rotary air distributor can * * To reduce the loss during air flow transportation, each mixing equipment can transport 50% more gas. The working efficiency of air distribution and conveying equipment can be determined by testing the air supply system during the production process of the equipment. “The production costs that can be reduced and the expenses that can be saved by using Wingjet technology cannot be generalized. This is partly due to the extended service life of the Wingjet gas stirring and mixing system. ； Especially in process industry equipment that handles strong abrasive media, these equipment are designed to have a long service life. There is no unified calculation and balance method for the ratio between long-term production cost investment and equipment investment. On the other hand, long service life not only eliminates the cost of replacing propeller blades, but also eliminates the cost of equipment shutdown time for maintenance. In short, by taking these measures, economic benefits have been significantly improved. ”Mr. Himmelsbach explained. The biggest cost savings comes from the extremely high oxidation reaction capacity of the rotary gas distributor. When using the new Wingjet air distributor's gas mixing and mixing system, 25% of the air mixing device is saved, and the investment in air delivery pipelines and electrical control equipment is also saved. Due to the reduction in the number of mixing equipment, the operating cost savings of the entire equipment are even greater, reaching 65%. Since 2000, air conveying equipment for large process industry plants has been modernized in Western Europe ； The performance of this gas stirring and mixing system also meets the requirements of American standards. Some thermal power plants and newly built thermal power plants in Eastern Europe have also requested to retrofit this modern Wingjet technical equipment. This demand is also increasing in Asia, especially in China.