Fluidised bed biomass combustion

生物质越来越多地被用作化石燃料的替代燃料。这沿着与由于所产生的灰分的化学组成而引起的附聚和沉积相关联的变化问题。在流化床系统中，这可以表现为沉积物在干舷区域中生长的形式，然后沉积物可以落到床并引起去流化。这又会导致局部热点发展，床内附聚物进一步成核和生长，这会加剧问题。最终，如果问题不能通过干预来预防或解决，那么工厂将关闭。为了避免这个问题，需要严格控制操作条件，并了解通过燃烧室的烟气流动。实验将在中试流化床（LCCC）上进行，这将是初步模型验证的基本系统。随后，该模型将被应用到一个工业合作伙伴的电厂，这是一个全尺寸的流化床燃烧室。结果将采取的形式，阐明团聚形成机制和优化的流体流动模型在燃烧室。

Increasingly , biomass is being used as replacement fuel for fossil fuels. This bring along with the change problems associated with agglomeration and deposition due to the chemical composition of the ash produced. In a fluidised bed system, this can manifest itself in the form of deposits growth in freeboard regions that can then fall to the bed and cause defluidisation. This can , in turn, cause local hot spots to develop with further nucleation and growth of in-bed agglomerates which can exacerbate the problem. Ultimately, if the problem cannot be prevented or resolved by intervention then a plant shut-down would occur. In order to avoid this problem strict control of operating conditions is required and a knowledge of flue gas flows through the combustor.This project will be both experimental and computational in nature. the experiments will be carried out on a pilot plant fluidised bed (LCCC) which will be the basic system for the preliminary model validation. Subsequently, the model will be applied to an industrial partner power plant which is a full size fluidised bed combustor. Outcomes will take the form of elucidation of agglomerate formation mechanisms and optimised fluid flow models in the combustor.