液化天然氣瓦斯爐熱效率提升之研究

本文的研究目的為提升家庭用瓦斯爐之熱效率及預測未來液化天然氣在台灣之發展趨勢。瓦斯爐是家家戶戶必備的烹飪器具，臺灣地區供應瓦斯爐的燃料除了有天然氣、液化石油氣、丙烷混合氣等，最近又增添一項「液化天然氣」。由於，瓦斯爐有一定的燃熱範圍，不同類別或不同成份的瓦斯，可能無法適用同一爐具。為瞭解將來液化天然氣推廣之後所可能引發的熱變問題，乃以市面上較具代表性之三種不同品牌瓦斯爐作測試。測試標準採用CNS3101家庭用燃氣爐具規範，測試結果發現只要適當調整噴嘴尺寸，就無所謂熱變問題，如浮火、回火、紅火等，惟其熱效率普通達不到國家標準所訂的45%。經實驗測試瓦斯流量、瓦斯壓力一次空氣量、爐架高低、鍋子形狀、燃燒器頭尼寸形狀等等，得知以上參數影響熱效率之主要因素在於燃燒器頭之焰孔角度以及所搭配之爐架度是否適中。本文將測試比較十餘種不同型式之燃燒器頭，分析後得到提高瓦斯爐熱效之最佳設計尺寸，提供業界的參考。

關鍵字

液化天然氣；本生式燃燒器；噴射器；一次空氣量；混合管

並列摘要

The purpose of this research is to study the promotion combustion efficiency of the domestic gas burner with various gas burner, height of frame, first air, nozzle diameter, and gas pressure. The production quantity of nature gas is offered with shortage in Taiwan. The phenomenon had not been shown until 1990 due to the fact that our country import liquefied natural gas from abroad. The natural gas powerhouse, compressed natural gas car, LNG cold energy utilization and LNG air-conditioning, etc. are therefore needed to develop so that a higher technology level and perspective environment could be achieved. Relevant definitions for the fundamental theory in combustion and burner design for domestic natural gas appliances also needs to making. This paper studies the fundamental aspects of the four main components of the Bunsen burner, such as the injector, air entrainment, mixing tube design, and burner port geometry. The experiment results are shown that the LPG and NG gas burner can converse to LNG gas burner when the inner ring is 0.7~0.9 Mm and the outer ring is 1.7~1.9 mm. The effect of the height of gas burner frame with Combustion efficiency is very strong. The optimum of the height of gas burner frame are 2.0~3.5 cm and 3.0~4.5 cm for small and large type pot respectively. The maximum Input heat of the domestic gas burner is optimum when the value is 0.40~0.50m3/hr. The Gas pressure should be adapted to 150±50 mmH2O. The angle between the center line and the horizontal line should be 45~60°C, and the diameter of flame orifice as 2.5~2.8 mm, the pitch of the edge of flame orifice as 4~6mm, and the depth of flame orifice as 8~10 mm those are optimum in this research results of the experiment. The throat Diameter of mixing tube as 15~20mm,the length of inlet as 25~30 mm, the length of Divergent as 120~150 mm, and the slope as 3°~5° are the optimum adapted for the Present gas burner. The present results can be provided a reference and applied to Designing a higher efficiency of natural gas appliance.

並列關鍵字

liquefied natural gas ； Bunsen burner ； air entrainment ； mixing tube

國際替代計量

液化天然氣瓦斯爐熱效率提升之研究

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