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摘要
Taking a 350 t·d?1 waste incinerator as the research object, this paper uses numerical simulation method to analyze the influence of ash accumulation in the lower collector of the primary evaporator on the temperature and flow field distribution around the evaporator and high temperature superheater. The first two rows of pipes of the first-stage evaporator are transformed to the third flue to optimize the distribution of the smoke flow field and the heat transfer characteristics of the heating surface. The results show that the ash accumulation at the bottom of the evaporator pipeline has a significant effect on the flow field and temperature distribution in the flue gas corridor of the high temperature superheater. The ash accumulation in the pipeline not only increases the thermal resistance of ash scale, but also reduces its own heat transfer capacity, and the heat load shifts backward. And lead to perimeter smoke temperature increase. Dust exhaust pipe optimization after modification, primary evaporator effect is abate, the flow field returns to normal, high temperature superheater smoke corridor in the flow field of velocity and temperature had obvious drop, high temperature superheater smoke corridor place less flow around and the overall heat transfer characteristics have obvious improve, reduce the risk of high temperature superheater of high temperature corrosion, the impact on the actual operation. ? 2023 Science Press.
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