使用表面火焰燃烧器中的光二极管对火焰结构的稳定性研究
Parmis Sadat Jazayeri1, Mohammad Zabetian Targhi2, Mohammad Reza Karafi1
1Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran.
Scientific reports
|March 6, 2024
概括
辐射光谱学有效地识别了污染物. 这项研究将火焰特性和温度与污染物水平联系起来,通过最大限度地增加氧化 (NO) 和最大限度地减少一氧化碳 (CO) 来优化工业燃烧器.
科学领域:
- 燃烧科学是一种科学.
- 频谱学是一种光谱学.
- 环境监测环境监测环境监测
背景情况:
- 辐射光谱是识别燃烧过程中的污染物和物种的宝贵工具.
- 了解火焰动力学,例如从细胞火焰过渡到表面火焰,对于优化燃烧效率和排放至关重要.
- 以前的研究已经探讨了燃料空气等价比率,温度和污染物形成之间的关系,但需要进行详细的光谱分析,将这些因素联系起来.
研究的目的:
- 用辐射光谱学研究火焰特征 (细胞火焰与表面火焰比率,频率峰值,火焰高度) 与燃烧温度之间的关系.
- 确定最大限度地减少一氧化碳 (CO) 和最大限度地减少一氧化 (NO) 排放的最佳等价比.
- 探索这些发现在工业燃烧器和类似的燃烧系统中的潜在应用.
主要方法:
- 使用光二极管分析辐射光谱学频率峰值.
- 测量火焰特性,包括电池火焰与表面火焰的比率和火焰高度,在不同的功率设置中.
- 与温度测量相关联的光谱数据,并分析了NO和CO在不同等价比率和温度下形成的情况.
主要成果:
- 细胞火焰与表面火焰的比率在0.7-0.74.4之间.
- 频率峰值随着功率的增加和更高的等效比率 (0.7-0.75) 的下降,与温度 (1400-1500 °C) 的增加相关.
- 在最高温度 (1500°C) 和0.77-0.81等效比下,NO的最大值约为16ppm,而CO的最低值约为2ppm.
结论:
- 辐射光谱学为火焰动力学和污染物形成提供了洞察力.
- 在特定的等效比率和温度范围内确定了最小化CO和最大化NO的最佳燃烧条件.
- 这些发现对设计和控制工业燃烧器有直接影响,以提高效率和减少排放.
相关概念视频
Flame Photometry: Overview
584
Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
584
Flame Photometry: Lab
245
In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
245
Gas Chromatography: Types of Detectors-II
371
In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
371
Gas Chromatography: Types of Detectors-I
426
There are different types of detectors used in gas chromatography, each with its own specific properties that make it suitable for detecting certain types of analytes. The most commonly used detectors in GC are thermal conductivity detector (TCD), flame ionization detector (FID), and electron capture detector (ECD).
TCD is the earliest and most widely used detector that operates by measuring the changes in the thermal conductivity of the carrier gas. When a sample compound enters the detector,...
TCD is the earliest and most widely used detector that operates by measuring the changes in the thermal conductivity of the carrier gas. When a sample compound enters the detector,...
426
Atomic Emission Spectroscopy: Interference
184
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
184
Combustion Energy: A Measure of Stability in Alkanes and Cycloalkanes
6.3K
The low reactivity in alkanes can be attributed to the non-polar nature of C–C and C–H σ bonds. Alkanes, therefore, were initially termed as “paraffins,” derived from the Latin words: parum, meaning “too little,” and affinis, meaning “affinity.”
Alkanes undergo combustion in the presence of excess oxygen and high-temperature conditions to give carbon dioxide and water. A combustion reaction is the energy source in natural gas, liquified...
Alkanes undergo combustion in the presence of excess oxygen and high-temperature conditions to give carbon dioxide and water. A combustion reaction is the energy source in natural gas, liquified...
6.3K


