Influence characteristics of the degree of flattening on the performance of double-P type radiant tubes studied by CFD simulation
-
摘要: 為改善輻射管熱效率,本文設計了一個扁雙P型輻射管,選取輻射管中心管截面長半軸A與短半軸B的比例為1.0、1.1、1.2、1.3和1.4五種扁形度,借助于FLUENT軟件就扁形度對輻射管傳熱性能的影響進行研究.結果表明:在保持雙P型輻射管換熱表面積不變的情況下,隨著雙P型輻射管扁形度的增加,輻射管對帶鋼的輻射角系數增大,輻射管對爐內輻射換熱量增加,輻射管熱效率升高;但是,隨著雙P型輻射管扁形度的增加,輻射管表面溫差逐漸增大,扁形度達到1.3后,表面溫度不均勻系數顯著增加.綜合考慮輻射管的表面溫差和輻射熱效率,扁形度為1.2的扁雙P型輻射管性能較優,與扁形度為1.0時(即輻射管未被壓扁的時候)相比,表面溫度均勻性幾乎不變,而輻射管熱效率提高約1%.
-
關鍵詞:
- 輻射管 /
- 扁形度 /
- 表面溫度 /
- 熱效率 /
- 計算流體力學(CFD)
Abstract: In order to improve the thermal efficiency of radiant tubes, a flat double-P type radiant tube was designed, and five major axis-to-minor axis ratios of 1.0, 1.1, 1.2, 1.3 and 1.4 on the cross section of the center pipe were taken for numerical simulation to investigate the influence characteristics of the degree of flattening on the performance of the radiant tube by using the commercial software FLUENT. It is found that in the case of keeping the heat transfer surface area of the radiant tube invariable, when the degree of flattening increases, the radiant angle factor for the radiant tube and strip steel gradually grows, the radiant heat flow improves, and then thermal efficiency of the radiant tube rises. However, with an increase in the degree of flattening, the surface temperature difference of the radiant tube gradually increases, and the surface temperature uniformity significantly deteriorates after the degree of flattening reaches 1.3. In consideration of the thermal efficiency and surface temperature uniformity of the radiant tube, the better degree of flattening is 1.2. At this degree of flattening the radiation heat efficiency of the radiant tube increases by about 1% compared with that at the degree of flattening of 1.0, while the surface temperature uniformity is almost the same. -
點擊查看大圖
計量
- 文章訪問數: 165
- HTML全文瀏覽量: 37
- PDF下載量: 10
- 被引次數: 0
下載:
