Radiation is the dominant mode of heat transfer near the burner of coal and biomass-fired boilers. Predicting and measuring heat transfer is critical to the design and operation of new boiler concepts. The individual contributions of gas and particle phases are dependent on gas and particle concentration, particle size, and gas and particle temperature which vary with location relative to the flame. A method for measuring the contributions of both gas and particle radiation capable of being applied in harsh high temperature and pressure environments has been demonstrated using emission from particles and water vapor using an optical fiber probe transmitting a signal to a Fourier Transform Infrared (FTIR) spectrometer. The method was demonstrated in four environments of varying gas and particle loading using natural gas and pulverized wood flames in a down-fired 130 kW_th cylindrical reactor. The method generates a gas and particle temperature, gas concentrations (H₂O and CO₂), total gas and particle intensities, and gas and particle total effective emissivity from line-of-sight emission measurements. For the conditions measured, downstream of the luminous flame zone, water vapor and CO₂ radiation were the dominant modes of heat transfer (effective emissivity 0.13–0.19) with particles making a minor contribution (effective emissivity 0.01–0.02). Within a lean natural gas flame, soot emission was low (effective emissivity 0.02) compared to gas (0.14) but within a luminous flame of burning wood particles (500 µm mean diameter) the particles (soot and burning wood) produced a higher effective emissivity (0.17) than the gas (0.12). The measurement technique was therefore found to be effective for several types of combustion environments.

辐射是燃煤和生物质锅炉燃烧器附近传热的主要方式。预测和测量热传递对新锅炉概念的设计和运行至关重要。气相和颗粒相的各自贡献取决于气体和颗粒的浓度，粒径以及气体和颗粒的温度，它们随相对于火焰的位置而变化。已经证明了一种测量气体和颗粒辐射的能力的方法，该方法可以在恶劣的高温和高压环境中应用，该方法使用了将颗粒和水蒸气发射出去的方法，该方法是使用将信号传输到傅立叶变换红外（FTIR）光谱仪的光纤探针。_第圆柱反应堆。该方法通过视线发射测量生成气体和颗粒温度，气体浓度（H ₂ O和CO ₂），总气体和颗粒强度以及气体和颗粒总有效发射率。对于所测量的条件，在发光火焰区域的下游，水蒸气和CO ₂辐射是热传递的主要方式（有效发射率0.13–0.19），而颗粒的贡献较小（有效发射率0.01–0.02）。在稀薄的天然气火焰中，烟尘的排放量比气体（0.14）低（有效发射率0.02），但是在燃烧的木材颗粒（平均直径为500 µm）的发光火焰中，颗粒（煤烟和燃烧的木材）产生的有效发射率更高（0.17）比气体（0.12）高。因此，发现该测量技术对于几种类型的燃烧环境是有效的。