Numerical simulation and optimization of the flow in the sintering flue gas circulating hot air hood
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摘要: 煙氣循環技術是基于部分熱廢氣被再次引入燒結過程的原理而開發的一種新型燒結模式，對提高燒結余熱利用率、降低污染物排放和燒結能耗具有顯著效果。但循環煙氣在煙氣罩內流動狀態、煙氣罩漏風狀況等對煙氣循環的效果及穩定性至關重要。為此，對某鋼廠循環煙氣罩內煙氣流動狀態及漏風狀況進行模擬，結果表明：現有煙氣罩人孔打開時雖然在一定程度上削弱了煙氣進入形成漩渦的強度，但并未改善煙氣旋轉流動，導致料面上煙氣流速不均；通過優化煙氣罩內導流板結構和數量，削弱了煙氣罩內煙氣旋轉流動，明顯改善了循環煙氣的流動，使煙氣分布更均勻；同時煙氣罩漏風狀況大大改善，優化后使A側漏風口由漏風1.2 m3?s?1變為吸風2.4 m3?s?1，有利于燒結生產的順行。Abstract: The flue gas circulation technology is a new type of sintering mode developed based on the principle of the reintroduction of part of the hot exhaust gas into the sintering process. It has considerable effects on improving the utilization rate of the sintering waste heat and reducing pollutant emissions and sintering energy consumption. However, the circulating flue gas flow state in the flue gas hood and air leakage of the flue gas hood are critical to the effect and stability of the flue gas circulation. Simultaneously, they have a considerable impact on the quality indicators of the sintered ore. To optimize the circulating flue gas flow state in the flue gas hood, improve the air leakage of the flue gas hood, and maximize the advantages of low pollution and low emission of the flue gas circulation sintering technology, this study simulated the flue gas flow status in the circulating flue gas hood of a steel plant and the air leakage situation. Results show that although the strength of the smoke entering to form the vortex is weakened to a certain extent when the existing smoke hood manhole is opened, the swirling flow of the smoke is not improved, resulting in the uneven flow velocity of the smoke on the material surface. Moreover, evident air leakage of the flue gas hood is observed. By optimizing the structure and number of baffles in the flue gas hood, the rotating flow of the flue gas in the flue gas hood is weakened, the circulation of the flue gas flow considerably improved, and the flue gas distribution is more uniform. Simultaneously, the air leakage of the gas hood greatly improved. After optimization, the air leakage on the side changes from a leakage of 1.2 m3·s?1 to a suction of 2.4 m3·s?1, which is conducive to the smooth movement of the sintering production.
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Key words:
- sintering /
- flue gas hood /
- flue gas circulation /
- air leakage /
- flow state
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圖 2 熱風罩流場及溫度場計算網格劃分
Figure 2. Grid division for flow field and temperature field calculation of hot air hood
圖 3 煙氣罩不同方案狀況示意圖.(a) 原方案; (b) 優化方案1; (c) 優化方案2
Figure 3. Schematic diagram of different schemes of the flue gas hood: (a) original scheme; (b) optimized scheme 1; (c) optimized scheme 2
圖 4 原方案煙氣罩內煙氣運動流線.(a) 人孔閉; (b) 人孔開; (c) 側視流線圖
Figure 4. Streamline of the smoke movement in the flue gas hood of the original scheme: (a) closed manhole; (b) opened manhole; (c) side view streamline diagram
圖 5 優化方案1煙氣罩內煙氣運動流線.(a) 人孔閉; (b) 人孔開
Figure 5. Movement streamline of the flue gas in the flue gas hood for the optimized scheme 1: (a) closed manhole; (b) opened manhole
圖 6 優化方案2煙氣罩內煙氣運動流線.(a) 人孔閉; (b) 人孔開
Figure 6. Movement streamline of the flue gas in the flue gas hood for the optimized scheme 2: (a) closed manhole closed; (b) opened manhole
圖 7 不同方案條件下漏風口速度場分布.(a) 原方案; (b) 優化1; (c) 優化2
Figure 7. Velocity field distribution of air leakage vents under different scheme conditions: (a) original scheme; (b) optimization 1; (c) optimization 2
圖 8 優化方案1 與原方案A側漏風處煙氣速度對比
Figure 8. Optimization plan 1 and original plan comparison of smoke velocities at the air leakage on side A
圖 9 優化方案2與原方案A側漏風處煙氣速度對比
Figure 9. Optimization plan 2 and original plan comparison of smoke velocities at the air leakage on side A
圖 10 煙氣罩原方案和優化方案A側漏風處漏風（負值）和吸風（正值）狀況
Figure 10. Air leakage (negative values) and suction (positive values) of the original and optimized schemes of the flue gas hood at the air leakage on side A
表 1 數學模型計算邊界條件
Table 1. Mathematical model to calculate boundary conditions
Boundary conditions Parameter Ventilation negative pressure/kPa ?18 Inlet pressure/kPa 0 Manhole pressure/kPa 0.1 Leakage pressure/kPa 0 Bed thickness/mm 850 Width of air leakage gap/mm 10 Bed width/mm 6200 
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