Heat recovery devices that may be installed in biomass boiler are economizer, air heater, and flue gas dryer. Economizer increases feed water temperature, air heater increases air temperature before combustion, and flue gas dryer decreases fuel moisture content. Each of them can equally increase boiler efficiency. Since all of them require heat transfer from flue gas produced by combustion of biomass fuel, there are limits to the sizes of these devices if they are installed together. In this paper, boiler and flue gas dryer models are used to determine the optimum installation that minimizes the total installation cost in biomass boiler. Furthermore, it is shown by simulation that, if the nominal unit costs of air heater and economizer are 100 $/m² and 120 $/m², the unit cost of flue gas dryer must be less than 65 $/(kg/h) in order for its integration in the boiler system to be economically justified.

可以安装在生物质锅炉中的热回收设备包括省煤器，空气加热器和烟道气干燥器。省煤器提高给水温度，空气加热器提高燃烧前的空气温度，烟气干燥器降低燃料的水分含量。他们每个人都可以平等地提高锅炉效率。由于所有这些装置都需要从生物质燃料燃烧产生的烟道气中进行热传递，因此，如果将这些装置安装在一起，则它们的尺寸将受到限制。在本文中，使用锅炉和烟气干燥器模型来确定最佳安装，从而最大程度地减少生物质锅炉的总安装成本。此外，通过仿真显示，如果空气加热器和节能器的名义单位成本分别为100 $ / m ²和120 $ / m ²，烟道气干燥器的单位成本必须低于65 $ /（kg / h），以使其在锅炉系统中的集成具有经济合理性。