This work aims at comparing different preparation chains to produce wood powders suitable for further gasification in an entrained flow reactor. Three wood powders, with particle size below 1 mm, have been produced at pilot scale from resinous wood chips: a powder of raw wood and a powder of torrefied wood both ground in a knife mill, and a powder of raw wood ground in a vibration mill. The respective requirements both in energy and in feedstock material resource have been determined for each chain of production. The production of the raw wood powder requires 0.83 MWh per ton of dry powder (tdp). The additional grinding step with the vibrating mill adds 0.63 MWhel.tdp⁻¹. The production of the torrefied wood powder requires 3.56 MWh.tdp⁻¹. Moreover, the wet wood chips requirements vary from 2.5 tons for the chains of production without torrefaction to 4.4 tons for the chain including a torrefaction step. In the latter, the step with the highest energy demand is the gas-cleaning step in an instrumented post-combustion reactor. Heat recovery from the combustion gases could supply energy to both the drying and torrefaction steps. It would reduce by half the total energy cost of the chain, down to 1.66 MWh.tdp⁻¹. The resource requirements would be reduced down to 3.2 tons. The morphology and flowability of the powders have been investigated and compared. Torrefaction or vibration milling significantly improve the ability of the wood powder to flow both without any stress or when consolidated by a vertical stress.

这项工作旨在比较不同的制备链，以生产适合在夹带流反应器中进一步气化的木粉。三种粒径小于 1 毫米的木粉，已由树脂木屑以中试规模生产：一种是用刀磨机研磨的原木粉和一种烘焙木粉，另一种是用振动研磨的原木粉磨。为每个生产链确定了能源和原料资源的各自要求。生产原木粉每吨干粉 (tdp) 需要 0.83 MWh。使用振动磨的额外研磨步骤增加了 0.63 MWhel.tdp ^-1。生产烘焙木粉需要 3.56 MWh.tdp ^-1. 此外，湿木片的要求从没有烘焙的生产链的 2.5 吨到包括烘焙步骤的链的 4.4 吨不等。在后者中，能量需求最高的步骤是仪表化后燃烧反应器中的气体净化步骤。从燃烧气体中回收热量可以为干燥和烘焙步骤提供能量。这将使链条的总能源成本降低一半，降至 1.66 MWh.tdp ^-1。资源需求将减少至 3.2 吨。已经研究和比较了粉末的形态和流动性。烘焙或振动研磨显着提高了木粉在没有任何应力的情况下或在受到垂直应力固结时流动的能力。