Optimization of physical property and working condition parameters in multi-size sinter vertical tank based on exergy analysis

Abstract

Aiming at the characteristics of multi-size particles in the waste heat recovery sinter vertical tank, a steady-state gas-solid heat transfer model of multi-size ver?tical tank was established. Based on exergy analysis, the influences of physical properties and working conditions on the gas-solid heat transfer and the waste heat recovery capacity of the vertical tank were studied. Finally, the optimum pa?rameter combination was obtained by the orthogonal test method. Results showed that the mono-size sinter was no longer suitable for analyzing the gas-solid heat transfer process of the vertical tank in the actual production. The total exergy of the multi-size sinter vertical tank increased first and then decreased with the in?crease of aspect ratio in the range of 0.39-1.75, and reaches the peak value when height-diameter ratio is 0.7. The total exergy increased with the increase of tem?perature difference between gas-solid inlet temperature. The total exergy increased first and then decreased with the increase of gas-material ratio in the range of 610-1170 m3 per tone, and reached the maximum value at the gas-material ratio of 850 m3 per tone. The exergy decreased with the increase of porosity in the range of 0.548-0.603. The most suitable vertical tank parameters were height-diameter ra?tio 0.44, sinter inlet temperature 800?C, gas inlet temperature 25?C, gas-material ratio 770 m3 per tone and porosity 0.601.