1. Institute of Thermal Science and Power Systems, Zhejiang University, Hangzhou 310027, China; 2. Zhejiang CWPC and BR Heavy Industry Co., Ltd, Hangzhou 310030, China
In order to analyze the gas-solid heat transfer performance in vertically-arranged sinter coolers, a one-dimensional steady-state model was established to evaluate the gas-solid heat transfer in a sinter bed. The amounts of energy and exergy recovered were used as the criteria to compare the waste heat recovery ability under different operating conditions. The model was solved numerically by an iterative algorithm. The results indicate that, when the size of vertically-arranged sinter coolers and the sinter particle parameters are given,the average air exergy increase is 1.28 GJ/h for each 10 ℃ increase of the sinter inlet temperature;whereas it decreases by 1.69 GJ/h for each 10 ℃ increase of the air inlet temperature(ambient temperature).With the gas-to-sinter flow rate ratio being increased from 550 to 700 m3/t (at standard temperature and pressure), the air exergy first increases toup to 49.51 GJ/h, followed by a sudden drop.Increasing the air inlet temperature leads to a drop of the maximum air exergy, while the corresponding optimal flow rate ratio increases. However, both the maximum air exergy and its corresponding optimal flow rate ratio increase with raising the sinter inlet temperature. The results presented may serve as a reference to maximize waste heat recovery in industrial practice by adjusting the flow rate ratio.
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