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A modelling approach for the assessment of an air-dryer economic feasibility for small-scale biomass steam boilers

机译：评估小型生物质蒸汽锅炉空气干燥器经济可行性的建模方法

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摘要

Fuel drying is an energetically and economically expensive pretreatment process, which may not be worth the investment in the case of small-scale generation plants. This paper presents an investigation on the air dryer feasibility to enhance the operation of biomass steam boiler. In the proposed approach, the external drying technology using preheated air and the biomass steam production system is modelled in terms of energy and an economical analysis. A focus is given to the system size influence on the dryer economic suitability: the smallest size of the biomass combustion system for which fuel drying is a suitable solution, from the economic point of view, is computed. In the computations, the heat used for drying is assumed to be part of the cost for operating the dryer and the thermal balance of the system is assumed to be previously verified. According to the model results, if the steam production plant operational time is above 8000 h/y, wood chips drying is feasible if the system size is larger than 1.78 tdaf/h of fuel processed.
机译：燃料干燥是一种能源和经济上昂贵的预处理过程，对于小型发电厂而言，这可能不值得投资。本文对空气干燥器提高生物质蒸汽锅炉运行的可行性进行了研究。在所提出的方法中，使用了预热空气和生物质蒸汽生产系统的外部干燥技术是根据能源和经济性分析进行建模的。着重于系统尺寸对干燥机经济适用性的影响：从经济角度出发，计算出适合燃料干燥的生物质燃烧系统的最小尺寸。在计算中，用于干燥的热量被假定为干燥机运行成本的一部分，并且系统的热平衡被假定为事先经过验证。根据模型结果，如果蒸汽生产厂的运行时间超过8000 h / y，则系统尺寸大于所处理燃料的1.78 tdaf / h时，木片干燥是可行的。

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