The results of experimental studies of the ignition processes of a large set of particles (from 100 to 500) of wood-coal composite fuels under conditions of high-temperature radiation-convective heating are presented. The ignition of wood-coal fuel mixture fuel particles was studied under the conditions of their free fall along the quill ceramic cylinder passage in a high-temperature oxidizing medium (air). Such a configuration provides the conditions that most closely match the heating conditions of actual furnaces of heat generating installations.

The experiments have been carried out on the mixtures of particles of subbituminous coal (that is quite typical of coal-fired power industry) with the particles of woody biomass of three types: birch, pine and larch, which are widely spread in the territory of many states of the northern part of the Earth hemisphere. The recording of the heating and ignition processes of the fuel mixture particles was carried out with a high-speed Photron FASTCAM CA45 (500 fps) camera. The air temperature in the passage along which the particles moved varied in experiments from 873 K to 1273 K. The purpose of the experiments performed was the ignition delay time (t_ign). The main variable factors are the ambient temperature and the concentration of woody components. The consistent errors in determining the main characteristics of the process did not exceed 5%, the random ones did not exceed 13%. The size of coal particles in the experiments did not exceed 60 μm, and of the wood - 5 mm.

It has been established that in such a fuel system one of the fuel components of the coal particle is “conducting” (or leading), and the second is “conducted” in the reaction of the thermochemical response of the fuel mixture with air oxygen. According to the results of experimental studies, the ignition delay times for the wood-coal particle mixtures have been stated. The increase in the concentration of small-sized coal particles in fuel mixtures from 0% to 100% leads to the decrease in the entire induction period (up to 20%) at the relatively cold temperatures.

It was also found that with typical sizes of coal particles up to 60 μm, stable ignition of sufficiently large wood particles (up to 5 mm), present in the mixture, is provided. The conditions and characteristics of ignition of wood-coal mixtures hardly depend on the type of wood, which is the second component of the mixture.

According to the results of the research conducted and following the requirements for optimizing the processes of fuel combustion, the use of mixed coal- and wood-based fuels in boilers of large and small power plants is justified.

提出了在高温辐射对流加热条件下大量的木炭复合燃料颗粒（从100到500）点火过程的实验研究结果。在高温氧化介质（空气）中，沿煤纤陶瓷圆柱通道自由落下的条件下，研究了木煤混合燃料的燃烧。这种配置提供了与发热设备的实际熔炉的加热条件最接近匹配的条件。

已对亚烟煤颗粒（这是燃煤发电行业中非常典型的）与三种类型的木质生物质颗粒（桦木，松树和落叶松）的混合物进行了实验，这些颗粒广泛分布在地球半球的许多州。使用高速Photron FASTCAM CA45（500 fps）相机进行燃料混合物颗粒加热和点火过程的记录。在实验中，颗粒沿其移动的通道中的空气温度在873 K至1273 K之间变化。进行实验的目的是点火延迟时间（t _ign）。主要的可变因素是环境温度和木质成分的浓度。确定过程主要特征的一致误差不超过5％，随机误差不超过13％。实验中的煤颗粒尺寸不超过60μm，木材的尺寸不超过5 mm。

已经确定的是，在这种燃料系统中，煤颗粒的一种燃料成分是“传导”（或引导）的，而第二种是在燃料混合物与空气氧气的热化学反应的反应中是“传导的”。根据实验研究的结果，已经指出了木煤颗粒混合物的点火延迟时间。燃料混合物中小尺寸煤颗粒的浓度从0％增加到100％，导致在相对寒冷的温度下整个诱导期（最多20％）减少。

还发现，对于典型尺寸最大为60μm的煤颗粒，可以稳定燃烧存在于混合物中的足够大的木质颗粒（最大5 mm）。木煤混合物着火的条件和特性几乎不取决于木材的类型，木材是混合物的第二成分。

根据所进行的研究结果，并根据优化燃料燃烧过程的要求，有必要在大型和小型发电厂的锅炉中使用混合煤和木材燃料。