富氫燃氣對加熱爐能源效益之影響

Influence of Hydrogen-Rich Fuel Gas on Furnace Efficiency

10.30041/CQ.201411_(87).0008

李建利(Chien-Li Lee)；周志儒(G. Chih-Ju Jou)

富氫燃氣 ； 加熱爐 ； 二氧化碳 ； Hydrogen-Rich Fuel Gas ； Furnace ； Carbon Dioxide

燃燒季刊

87期（2014 / 11 / 01）

69 - 78

繁體中文

本研究以回收石化製程單元（如觸媒重組及觸媒裂解）產生之富氫尾氣（tailgas）能源，採漸進式添加以取代天然氣使用量，實際應用於蒸餾程序中之加熱爐進行現場實測。結果顯示，火焰長度（flame length）及橙黃色明亮度隨著FG進入燃料（天然氣）中添加量的增加而明顯降低，絕熱火焰溫度大於1800℃，其thermal NO_x是優勢形成機制。氮氧化物形成量平均增加36.8 ppm，二氧化碳排放量每年平均可減少3.5×10^4 tons，減少率為53.4%及平均可節省5.8×10^6 m^3/yr天然氣使用量。因此以富氫廢氣能源回收作為一種燃料選擇，就整體經濟效益評估，將可節省相當可觀燃料成本及有效降低二氧化碳排放量。

The hydrogen-rich tail gas (FG) emitted from petrochemical operations (e.g. catalytic reforming unit and catalytic cracking unit) was recovered and reused as a supplementary fuel. It was slowly added to the fuel stream of a furnace to replace natural gas gradually for powering a full-scale distillation process. The results show that both the flame length and orange-yellowish brightness decrease with more proportion of FG in the natural gas. However, the adiabatic temperature is greater than 1800℃. With natural gas replaced by FG, 5.8×10^6 m^3 natural gas can be saved annually. Because the thermal NO_x is the dominant formation mechanism, NO_x increases 36.8 ppmv in the emission and CO_2 is reduced by 3.5×10^4 tons annually or 53.4% reduction. Recovering and reusing the hydrogen-rich waste fuel gas as natural gas supplement will achieve tremendous savings of natural gas usage and effectively lower the emission of carbon dioxide.