碩士生: 莊博丞
畢業年分: 2022年9月
論文名稱: 建置雙色高溫測量法探討氨氣添加於甲烷/空氣預混火焰之燃煤影響(中文) / Developing a two-color pyrometry measurement to discuss the effect of ammonia addition on coal combustion of premixed methane/air flames(英文)
中文摘要:
碳氫燃料是導致空氣污染和全球暖化的主要原因，因此零碳排放的目標有待實現。最近的研究表明，氨可視為替代燃料，為可再生能源提供能量儲存。此外，氨可視為氫載體的零碳載體。然而，與碳氫燃料相比，氨具有較低的可燃性極限、火焰溫度和火焰燃燒速度等缺點，導致低反應性和NOX生成率較高。因此，提出了用氨（NH3）混燒煤的想法。本研究調查了氨 (NH3)與煤共燃過程中的燃燒行為，並開發了一種用於測量火焰場中煤顆粒的固體燃料溫度的診斷技術。非侵入式診斷技術的優點是避免了溫度測量對流場產生影響。因為利用兩個波長作為燃燒煤顆粒發射的濾光片，以測量粉煤顆粒溫度，因此被稱為“雙色高溫法”。 在雙色高溫計中，兩種波長的熱輻射由煙灰顆粒發射並測量為溫度。當燃燒過程中存在的氧氣不足並產生碳煙時，就會發生烴類燃料的不完全燃燒。因此，煤顆粒可以認為是很多煤煙顆粒的聚集體。混合火焰類型包含甲烷/空氣/煤和甲烷/氨/空氣/煤預混火焰。本研究測量了污染物 CO 和 NOX 排放，以闡明混燃機制。為了確認燃燒，針對完整的煤粉顆粒和燃燒後的顆粒進行採樣。此外，透過掃描式電子顯微鏡（SEM）計算顆粒減少面積。
英文摘要:
Hydrocarbon fuels are major contributors to air pollution and global warming, making the goal of zero carbon emissions crucial. Recent research suggests ammonia as an alternative fuel that can provide energy storage for renewable sources and serve as a zero-carbon hydrogen carrier. However, compared to hydrocarbons, ammonia has drawbacks such as lower flammability limits, flame temperature, and flame speed, leading to low reactivity and higher NOX generation. Therefore, co-firing ammonia (NH3) with coal has been proposed.
This study investigates the combustion behavior of co-firing ammonia and coal, and develops a diagnostic technique to measure the solid fuel temperature of coal particles in the flame field. The advantage of this non-invasive diagnostic technique is that it avoids disrupting the flow field during temperature measurement. By using two wavelengths as filters for the emitted light from burning coal particles, this technique, called the "two-color pyrometry method," measures the temperature of pulverized coal particles. The thermal radiation at two wavelengths is emitted by soot particles and measured as temperature. Incomplete combustion of hydrocarbon fuels occurs when there is insufficient oxygen, resulting in soot. Thus, coal particles can be considered aggregates of many soot particles.
The mixed flame types include methane/air/coal and methane/ammonia/air/coal premixed flames. This study measured pollutants such as CO and NOX emissions to elucidate the co-combustion mechanism. To verify combustion, both unburned and post-combustion coal particles were sampled. Additionally, the reduction in particle area was calculated using a scanning electron microscope (SEM).
