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26
2022
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08
What is the comparison of several desulfurization tower high-efficiency demisting technologies?
The plate type electric demister uses the technical measures of physical collision of flue gas and moisture absorption to achieve the effect of water gas separation, and then collects the condensed moisture under the action of gravity. After simple improvement, the water absorption effect of the plate can be improved. By using polytetrafluoroethylene, the operating load of the blade can be reduced, and the defogging effect can be enhanced. Electrostatic demister uses high-voltage discharge to ionize flue gas, and then removes ultrafine droplets through directional movement of charged particles. Through technical improvement, the use of honeycomb precipitation electrode can improve the power effect and improve the demisting efficiency. The pneumatic enhanced demisting uses the pressurization technology to increase the centrifugal force of the flue gas under the action of high pressure to achieve the separation effect, and the demisting efficiency can be stably maintained at more than 90%.
In terms of technology investment, as new technologies and equipment are put into use, the cost of electrostatic demister and pneumatic enhanced demister has a tendency to reduce. In particular, after the promotion and application of the enhanced pneumatic demister and dust fall deflector assembly, not only the content of fog droplets at the outlet is reduced, but also the cost is reduced by about 40% compared with the initial equipment. After the improvement, the cost of the plate demister increases greatly. For example, if a new blade is used to replace the original blade, the unit price of the blade is about 120 yuan higher. Therefore, only from the perspective of cost, the cost of electrostatic demister and pneumatic enhanced demister is low, and the cost of plate demister is high.
The improved plate mist eliminator and electrostatic mist eliminator have significantly improved their effects in improving the absorption efficiency of ultrafine fog droplets, reducing "gypsum rain" and dust emission. However, there is still a certain gap between the treatment effect of the pneumatic enhanced demister and that of the pneumatic enhanced demister. For example, from the perspective of the removal ability of ultra-fine fog droplets, the plate demister has a high removable droplet size of 50 μ m. After improvement, the electrostatic demister can control the particle size of highly removable droplets within 10 μ M U.M, and the high removable droplet size can be maintained at 3 μ M or less.
In the context of vigorously promoting energy conservation and emission reduction, in addition to pursuing higher efficiency, energy consumption is also a problem that needs attention. Among the three demisting technologies mentioned in this paper, the energy consumption of electrostatic demister is high, the energy consumption of plate demister is second, and the energy saving effect of pneumatic enhanced demisting technology is obvious. In the pneumatic enhanced demisting system, there is a special thermal energy collection and conversion device, which can recover the heat in the high-temperature flue gas and convert it into mechanical energy or electrical energy to support the operation of the pneumatic device. Although external power supply is also required for energy supply, compared with the other two demisting technologies, it has a significant effect in energy saving and consumption reduction.
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