科研之友
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摘要
The large number of high - temperature dust - containing gases produced in the production of industrial furnaces carry a lot of waste heat and energy. If they can be reasonably recycled, it will create great economic and environmental value. Therefore, the purification and dust removal of high-temperature gas is a key technology to realize the effective utilization of resources and environmental protection. The new metal porous material has excellent applicability and superiority in high-temperature flue gas dust removal due to its good temperature resistance, mechanical properties, and thermal conductivity. In this paper, the metal wirework ash bag filter was selected as the research object. Through the combination of experiment and numerical simulation, the influences of the inlet air flow rate, dust concentration, and inlet temperature on the pressure drop of the dust removal system were explored. The experimental results show that the pressure drop of the system increases with the increase of the inlet air flow rate. When the inlet clean air flow rate increases from 0. 4 Nm3/h to 34.3 Nm3/h, the pressure drop increases rapidly from 12. 6 Pa to 1 989 Pa. The system pressure drop of dusty gas is higher than that of clean air under the same gas flow rate and the pressure drop increases with the increase of ash concentration in gas. When the dust concentration is higher than 53 g/m3, the pressure drop decreases. The higher the inlet temperature is, the higher the average pressure drop of the system is. When the inlet temperature rises from 13 ℃ to 202 ℃, the pressure rises from 520.5 Pa to 941.5 Pa. The simulated pressure drops and outlet temperatures are in good agreement with the experimental results. Under the conditions of lower inlet temperatures(<300 ℃), the system pressure drop of dust collector is mainly affected by the surface pressure drop of the metal wirework filter bag. When the inlet temperatures increases, the pressure drop increases significantly. The pressure drop is approximately 3 000 Pa for the inlet temperature of 600 ℃, greatly higher than thesurface pressure drop of the bag filter. And thus the pressure drop of the structure of dust collector needs to be considered during the design of bag filter.
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单位高温气体动力学国家重点实验室; 中国科学院大学
