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頁籤選單縮合
題名 | 玉米穗軸燃燒爐紊流分析 |
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作者 | 吳中興; | 書刊名 | 農業工程學報 |
卷期 | 34:1 1988.03[民77.03] |
頁次 | 頁61-75+ |
分類號 | 434.251 |
關鍵詞 | 分析; 玉米; 紊流; 燃燒爐; 穗軸; |
語文 | 中文(Chinese) |
中文摘要 | 由於玉米穗軸等農產品固態廢棄物,不像油品那麼容易燃燒,且燃燒過程中,產生大量揮發物,需耗費較長的燃燒時間,所以燃燒室內廻流區的位置和大小及紊流強度,對玉米穗軸能否完全燃燒,影響很大。本文採用K-ε紊流模式,與有限差分方法,以數值模擬燃燒室內之紊流場,並討論不同風口之流量比,噴射角,二次通風口位置,及加裝三次通風口時,各項變數對流場之影響。 數值模擬結果顯示,若空氣主要由底部之一次通風口,進入燃燒室時,空氣滯留在燃燒室內的時間很短,不利於燃燒之完全。當進入二次通風口之流量較大時,才有顯著的廻留區產生。二次通風口的噴射角,應小於90°,否則二次通風口附近之寬闊廻流區會消失。改變二次通風口之位置,不影響廻流區與紊流強度之大小。若再增設三次通風口時,將使燃燒室低速廻流區之範圍擴增不少,對延長燃燒時間,有相當大的幫助。本研究之結果,將可做為日後玉米穗軸等農產品廢棄物燃燒爐研製及功能改進之參考。 |
英文摘要 | Most crop residues, such as corncobs, exist in solid state. They are not so easily incinerated as petroleum products and need more time to oxidize the volatile material produced in the early stage of combustion. However, the proper position and domain occupied by the recirculation zone in a combustion chamber could improve the combustion effect of the corncob furnace magnificently by means of the increments of reaction time and turbulent intensity. This study adopted the k-ε turbulence model and employed the finite difference method to simulate the turbulent flow field inside the combustion chamber numerically. The results of the simulation show that if most of air entered the combustion chamber from the bottom inlet port, the residence time for the mixture of air and volatile material in the chamber will be very short, therefore the related combustion efficiency can be concluded as not good. In the case that the ratio of air flow rates of the secondary and the first inlet ports is high, the obvious existence of the recirculation zone will be observed. The injection angle of the secondary inlet port should be smaller than 90°, otherwise the wide recirculation zone near the central area found in the cases of acute injection angles may disappear. The movement of the position for the secondary inlet port can not alternate the range of the recirculation zone and its corresponding turbulence intensity. When a third inlet port was set up furthermore, the dimension of the low speed recirculation zone in the combustion chamber increased highly, and thus lengthened the combustion time evidently. Hopefully the results of this research could offer valuable information for the construction of the modification of related biomass conversion equipments. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。