This laboratory study reports results on the group particle combustion of pulverized bituminous coal and various types of torrefied biomass. Combustion of particle streams in a drop tube furnace in air was concurrently monitored by a spectrometer and an electronic camera to obtain spectral emissivities and temperatures. As particle number density (PND) increased, biomass particles became more prone than coal to group combustion. Spectral emissivities increased with increasing PND from 0.2 to 0.4 for coal and from 0.1 to 0.3 for biomass, in the wavelength domain of λ = 600–1000 nm. Emissivities changed little with wavelength, giving credence to the gray body assumption. Particle cloud temperatures were in the range of 1650–1900 K, depending on PND, type of fuel, and location in the cloud; temperatures decreased with increasing PND. The radiative heat of the particle laden flames was predominantly attributed to burning chars in the flames and it increased with increasing PND.

中文翻译：

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烘焙生物质和煤在团粒燃烧中的温度和发射率


该实验室研究报告了粉状烟煤和各种类型的烘焙生物质的群体颗粒燃烧的结果。通过光谱仪和电子相机同时监测空气中落管炉中颗粒流的燃烧，以获得光谱发射率和温度。随着颗粒数密度（PND）的增加，生物质颗粒比煤更容易团燃烧。在 λ = 600–1000 nm 的波长范围内，随着 PND 的增加，煤炭的光谱发射率从 0.2 增加到 0.4，生物质从 0.1 增加到 0.3。发射率随波长变化很小，这证实了灰体假设。粒子云温度在 1650–1900 K 范围内，具体取决于 PND、燃料类型和云中的位置；温度随着 PND 的增加而降低。充满颗粒的火焰的辐射热主要归因于火焰中燃烧的炭，并且随着 PND 的增加而增加。