燃煤机组耦合生物质直燃发电研究进展: 非球形生物质大颗粒气固两相动力学模型

Co-firing biomass power generation in power plants is one of the feasible and realistic ways to make full use of biomass energy resources with near-zero carbon emissions in the context of dual carbon targets. Nowadyas, there are few demonstration projects of co-firing biomass power generation in power plants. The technical maturity needs to be improved. There are problems such as fuel crushing and transportation, combustion organization, and boiler heating surface corrosion. Computational Fluid Dynamics (CFD) provides an effective research method for the optimal design and operation of energy and power plants. The research status of the gas-solid two-phase dynamic model of biomass particles was mainly reviewed. The existing problems were summarized, and the research suggestions were proposed. Biomass particles are large and exhibit irregular non-spherical. In the absence of mature technology and relevant experience in China, the accurate simulation of the motion trajectory of irregular and large for non-spherical biomass particles is the basis and key to accurately simulate the combustion process, which is also a difficulty in this field. However, there is no general model of gas-solid two-phase dynamics for large non-spherical biomass particles under dilute phase flow conditions. It is suggested to strengthen the basic theoretical research on the gas-solid two-phase dynamic model for efficient combustion of biomass particles. A new correlation of drag-lift coefficient and moment coefficient of various typical non-spherical particles is obtained by particle-resolved direct numerical simulation(DNS), which couples the translational and rotational motion of non-spherical particles. A general gas-solid two-phase dynamic model for large non-spherical biomass particles is constructed. After further experimental verification, it is applied to multiphase flow simulation in industry, which provides support for revealing the particle transport and thermal conversion characteristics in the coupling process of co-firing biomass power generation in power plants.