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Simulation of Heat Transfer in Vertical Cooling Tank for Sintering Heat Recovery

Author: LiJie
Tutor: DongHui
School: Northeastern University
Course: Refrigeration and Cryogenic Engineering
Keywords: sinter waste heat vertical tank recovery simulation
CLC: TF046.4
Type: Master's thesis
Year: 2011
Downloads: 79
Quote: 0
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Abstract


Due to the optimization of iron and steel production procedure and decreasing of process energy consumption, recycling waste heat and energy generated by each procedure becomes one of the most sufficient ways to get the aim of energy saving and emission reducing. Agglomerate almost cooled by cooler. But the structure and operating parameters are difficult to get high efficiency of recycling and reusing. The sinter cooler have a certain degree handicap in sensible recycling. Due to the air leak of the cooling system and heat loss in the surface of the cooling loop wheel machine. The team introduces a vertical cooling tank recycling method. This method not only can solve the air leak of the cooler and the low sufficient heat resource recycling, but also can give the solution of portion heat recycling of common cooler. This machine can almost get all recycling with agglomerate sensible heat. So, based on the porous media model, multi-physics coupling software Comsol was used to simulate the steady-state heat transfer process of the vertical tank, supported by thermodynamic analysis to study the basic laws of gas-solid heat transfer factor of the vertical tank, which was used to explore the vertical tank, structural parameters and operating parameters in actual production. The results show that,(1) Sinter layer height is one of the influence factors to air outlet temperature.1) In a certain range, keep the production capacity unchanged and sinters was cooled to the similar temperature. With the sinter layer height increases, the average air outlet temperature gradually increased, while gas feed ratio declined. The exergy carried by the outlet air showing a trend of increased first and then decreases.2) Keep the production capacity and cooling air flow unchanged, in a certain range, with the material layer height increases, the average sinter outlet temperature decreases, while the average air outlet temperature showing a trend of increased too, and the carried exergy was increased first and then steadied. For the domestic 360m2 sintering plant in this paper, when 2 tanks packaged, production capacity is 232t/h per tank, the suitable sinter layer height is 6m, when 1 tank packaged, production capacity is 464t/h per tank, and the suitable sinter layer height is 7m. (2) Ari feed ratio is another influence factor to the air outlet temperature. In a certain range, keep the production capacity and the sinter layer height unchanged, with the air feed ratio increases, the average sinter outlet temperature decreases, while the average air outlet temperature gradually increased. The heat carried by the outlet air constantly increasing while the exergy showing a trend of increased first and then decreases. So at the certain sinter layer height, air feed ratio has its own certain range.(3) For the domestic 360m2 sintering plant in this paper, when production capacity 464t/h per tank,1 tank packaged, sinter layer height is 7m the suitable air feed ratio is about 1526m3/t. When production capacity 232t/h per tank,2 tanks packaged and sinter layer height is 6m the suitable air feed ratio is about 1409m3/t.

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CLC: > Industrial Technology > Metallurgical Industry > General issues > Smelting of raw materials and ore pretreatment > Ore pretreatment, sintered pellets > Sintering
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