无焰燃烧是一种同时具备高效和低排放特点的燃烧技术，然而传统实现无焰燃烧所需的高温预热空气及高速射流两大重要条件，提高了整体工业设备实现无焰燃烧的复杂性，限制了该技术在更广阔领域的发展。本文综述了无焰燃烧燃烧机理与特性的研究发展，并提出了未来可能的发展趋势。分析发现：高温预热空气并不是实现无焰燃烧的必要条件，而通过高速射流提高炉内烟气循环率却必不可少；使用EDC模型结合GRI 3.0反应机理能在数值模拟中得到贴合实验数据的结果；气体、液体及固末燃料均可实现无焰燃烧，使用CH4/H2混合气体实现无焰燃烧可在提升燃烧稳定性的同时依旧保持低排放的特点；炉膛结构可很大程度上影响炉内流场进而影响无焰燃烧效果。因此，研究无需预热的无焰燃烧系统在降低工业成本的同时可增大燃料种类的选择性，通过设计合理的炉膛结构，营造良好的炉内流场在强化无焰燃烧效果的同时可一定程度降低对初始射流速度的要求，研究CH4/H2混合气体的燃烧机理具有十分重要的意义。

Flameless combustion is a combustion technology with both high efficiency and low emission characteristics. However, two important conditions of high temperature preheated air and high speed jet,which are required to realize flameless combustion traditionally,have increased the complexity of the overall industrial equipment to achieve the flameless combustion and limited the development of this technology in a wider field. This paper reviews the research development of combustion mechanism and characteristics of flameless combustion, and proposes possible future development trends.The analysis shows that high preheated air is not a necessary condition for flameless combustion, but it is essential to increase the flue gas circulation rate in the furnace by high speed jet. The use of the EDC model combined with the GRI 3.0 reaction mechanism can achieve the most practical test data results in numerical simulation. Flameless combustion is possible for gas, liquid and solid fuels, and flameless combustion using a CH4/H2 gas mixture can improve combustion stability while still maintaining low emission characteristics. The furnace chamber structure can greatly influence the flow field in the furnace and thus the flameless combustion effect. Therefore, flameless combustion systems without preheating can be investigated to reduce industrial costs and increase the selectivity of fuel types. By creating a good flow field in the furnace with a welldesigned chamber structure, the flameless combustion effect can be enhanced and the initial jet velocity requirement can be reduced to a certain extent. The study of the combustion mechanism of CH4/H2 gas mixture is of great practical significance.

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