燒結礦佈料機結構與其偏析實驗分析

Experimental analysis of sinter distributor structure and its segregation effect

朱峻賢(Jun-Hsien Chu)

指導教授 ： 梁智創

國立屏東科技大學/工學院/車輛工程系所/碩士(2009年)

https://doi.org/10.6346/NPUST.2009.00112

摘要

燒結場生產燒結礦後經燒結礦冷卻機(sinter cooler)冷卻，再由輸送帶運送到高爐。當燒結礦進入輸送皮帶時，溫度不宜太高，否則輸送帶容易因高溫而損壞。而目前中鋼佈料機之問題在於一號燒結機佈料不均導致冷風無法均勻滲透到每一塊燒結礦表面，所以冷卻機的效率不佳。目前，比較大顆的燒結礦都聚集在冷卻機內側，而比較小顆的則在冷卻機外側。冷卻機中的燒結礦分佈很明顯內外側不均勻。有鑒於此，為了改善目前佈料不均狀況，圖有效地佈料以提高冷卻的效率，本研究先探討佈料機中板層的參數設定後，再提供方案改善目前一號燒結場佈料機進而達到燒結礦最佳冷卻效果。本研究製作一台縮小比例為1：5及一台為縮小1:10的佈料實驗盒。從中鋼的燒結礦中，選取出大中小三種尺寸的燒結礦作為實驗對象。並進行燒結礦落料測試以及落料距離之探討。研究發現當板層為30°-35°為較佳的角度，因為在這角度範圍內燒結礦不易殘留且能較大化3種尺寸燒結礦偏析的距離。之後本研究也對改變佈料機內構造參數作探討，將現有佈料機設備參數做調整及搭配，模擬實際佈料機的料流狀況並探討料堆分佈對其透氣性產生體積流率之結果。研究結果發現，調整佈料機內進料側的斜板及右側的擋板角度，加上出料孔的圓弧擋板可以改變佈料的顆粒排列結構進而讓冷卻機載具的透氣性能增加。而佈料機內部較佳設定參數θ1介於35°及40°，θ2為50°以及出料孔圓弧半徑為0.5r。

關鍵字

佈料機 ； 偏析 ； 燒結礦 ； 冷卻機 ； 田口方法

並列摘要

After sinters are produced in the sinter plant, they are sent to the sinter cooler to cool down. After then, they are sent to the blast furnace via conveyor belts. When the sinters are sent into the conveyor belt, its temperature should not be too high. Otherwise, the conveyor belt can be easily destroyed because of the high temperature. China Steel Corporation is currently facing a problem in which the sinters from the #1 sinter plant are not distributed evenly in the sinter cooler. This causes the cooling air unable to evenly reach the surface of each sinter. Therefore, the cooling efficiency of the sinter cooler is not good enough. At this moment, sinters of larger size are mostly distributed at the inner side of the sinter cooler while those of smaller size are on the outer side. The distribution of sinters within the sinter cooler is apparently uneven. For this reason, this study aims to achieve more even sinter distribution and hence improve the cooling efficiency of the sinter cooler by firstly investigating the plate parameters in the sinter distributor and then providing suggestions for #1 sinter distributor improvement so that the cooling efficiency of the sinter cooler can be increased. This study built an experimental rig having a scaling factor of 1:5 and then another of 1:10. Based on the sinters China Steel Corporation supplied, sinters of three different sizes were selected and went through a sinter drop test and a sinter landing test. It was found that a plate inclination of 30°-35° is most suitable because this range of angle can avoid sinter accumulation within the distributor as well as maximize the distance between the sinters of different size when they land on the ground. After that, this study has also investigated the parameters related to the interior structure of the distributor by varying and combining these parameters to experimentally simulate the granular flow in the distributor. Based on these results, the sinter distribution in and air flow rate past the sinter cooler were studied. This study shows that the adjustments of the slandering plate, the opposite plate, and the circular shield on the outlet holes are capable of changing the sinter distribution and therefore the amount of air flow through the sinter cake.Based in the result obtained from current study,it is found that if 35°≦θ1≦40°, θ2=50°and the radius of the circular shield is set half of the hole width will yield a sounding result.

並列關鍵字

Distributor ； Segregation ； Sinter ； Sinter cooler ； Taguchi method

參考文獻

[2]Miserque O, and Pirard E (2004). Segregation of the bulk blend fertilizers. Chemometrics and intelligent laboratory systems. 74: 215-224.

[3]Umekawa H, Furui S, Oshima Y, Okura M, Ozawa M, and Takenaka N (2005). Quantitative measurement of segregation phenomena in a binary-mixture fluidized bed by neutron radiography. Nuclear Instruments & Methods in Physics Research, Section A. 542: 219-225.

[5]Nienow AW, and Cheesman DJ (1980). The effect of shape on the mixing and segregation of large particles in a gas-fluidised bed of small ones. In Fluidization; J.R. Grace, J.M. Matsen (Eds.). Plenum Press, New York.

[7]Wu SY, and Baeyens J (1998). Segregation by size difference in gas fluidized beds. Powder Technology. 98: 139-150.

[8]Poriona P, Sommierb N, Faugere A-M, and Evesque P (2004). Dynamics of size segregation and mixing of granular materials in a 3D-blender by NMR imaging investigation. Powder Technology, 141: 55-68.