To understand the fuel characteristics of a waste shiitake mushroom bed derived from hardwood chips, the moisture content at the time of disposal and after 1 month, as well as its calorific value, ash content, and elemental composition, were investigated. The moisture content on a wet basis (MCw) was 78% at the time of disposal and was as high as 63% even 1 month after disposal. It is considered that the slow drying process is caused by the low moisture permeability of the skin of mushroom bed, and therefore, it is preferable to crush the waste mushroom bed before drying. Comparing the gross calorific value on a dry basis of the waste mushroom bed with that of the cultivation bed wood chips, the value inside of the waste mushroom bed was similar, while that of its skin was significantly lower (by 11%). The reason for this lies in the significantly higher ash content and nitrogen content compared to those of wood. When analyzed from the combustion heat of the contained elements, it was found that both the cultivation bed wood chips and the waste mushroom bed had almost no hydrogen contributing to combustion due to their high oxygen content, and they were dependent on the heat generation of carbon. As a result of finding the relationship between the net calorific value that can be used as a boiler fuel and MCw, for example, the value at an MCw of 50% was calculated to be 7.6 MJ/kg, which was almost the same as that of sugi (Cryptomeria Japonica) sapwood and bark. The ash content of the waste mushroom bed was about 7%, which is close to that of bark and about ten times that of the wood used for the cultivation bed. When the waste mushroom bed is used as boiler fuel, appropriate ash treatment is required as in the case of using bark.

中文翻译：

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源自硬木片的香菇废床的燃料和材料利用I：元素成分和灰分的发热量特征

为了了解衍生自硬木片的废香菇床的燃料特性，研究了废弃时和1个月后的水分含量，热值，灰分和元素组成。废弃时的湿基水分（MCw）为78％，甚至在废弃后1个月也高达63％。认为干燥过程缓慢是由于蘑菇床的皮肤的低透湿性引起的，因此，优选在干燥之前将废弃的蘑菇床压碎。将废蘑菇床的干热值与栽培床木屑的总热值进行比较，废蘑菇床内部的值相近，而其表皮的值则低得多（降低了11％）。其原因在于与木材相比，灰分和氮含量明显更高。从所含元素的燃烧热进行分析时，发现栽培床木屑和废蘑菇床由于含氧量高，几乎没有氢助燃，并且它们依赖于碳的发热。例如，找到可用作锅炉燃料的净热值与MCw之间的关系的结果，计算出的MCw为50％时的值为7.6 MJ / kg，与该值几乎相同杉（柳杉）边材和树皮。蘑菇废床的灰分约为7％，接近树皮的灰分，约为栽培床用木材的十倍。