Effect of bagasse drying on thermal energy storage utilizing zeolite water vapor ad/desorption at a sugar mill
Effect of bagasse drying on thermal energy storage utilizing zeolite water vapor ad/desorption at a sugar mill
复制标题
糖厂甘蔗渣干燥对利用沸石水蒸气吸附/解吸热能储存的影响
DOI：
10.1016/j.est.2022.104495
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发表时间：
2022
影响因子：
9.4
通讯作者：
Nakagaki Takao
中科院分区：
文献类型：
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作者：
Fujii Shoma;Kanematsu Yuichiro;Kikuchi Yasunori;Nakagaki Takao
近年来，甘蔗产业的多联产不仅生产原糖，而且还生产其他产品（乙醇和电力），通过利用当地自然资源实现绿色经济，引起了人们的关注。我们专注于“热”作为甘蔗产业的多联产方法。本研究描述了一种热能储存和运输系统，可以消除热源，糖厂和化石燃料消耗之间的时空不匹配。多联产系统将热能储存系统与糖厂设备连接，使得通过干燥甘蔗渣（具有高水分含量的燃料）产生的额外功率用作热能储存的辅助功率。在这里，假设甘蔗渣干燥过程中的糖厂，我们研究了甘蔗渣干燥速率，甘蔗渣干燥在甘蔗渣提升机，模拟甘蔗渣干燥的糖厂，和热能储存系统，利用水蒸气AD/解吸周期的沸石，在种子岛，日本的糖厂，被用作一个例子。以甘蔗渣为填料进行了固定床实验，建立了固定床反应器内温度分布和出口蒸汽压演化的数值模型。随后，甘蔗渣干燥过程中使用的覆盖甘蔗渣升降机进行了数值模拟，和水分减少2%的预期。该结果被纳入过程模拟中，以评估额外发电量与温度以及用于热能储存的未使用热量的流速之间的关系。最后，将此关系式应用于蓄热装置的数值设计中，以评估甘蔗渣干燥对蓄热系统的影响。有蔗渣干燥的供热系统的性能系数（COP）是没有蔗渣干燥的供热系统的1.6倍。
Recently, polygeneration in the sugarcane industry, which produces not only raw sugar but also other products (ethanol and electricity), has been attracting attention for green economy via the utilization of local natural resources. We focus on “heat” as a polygeneration method for the sugarcane industry. This study describes a thermal energy storage and transport system that can eliminate the spatio-temporal mismatch between the heat source, the sugar mill, and the fossil fuel consumption. The polygeneration system connects the thermal energy storage system with the sugar mill plant, such that the additional power generated by drying sugarcane bagasse, a fuel with a high moisture content, is used as the auxiliary power for thermal energy storage. Here, assuming the bagasse drying process at a sugar mill, we studied the bagasse drying rate, the bagasse drying in the bagasse elevator, simulations of a sugar mill with bagasse drying, and the thermal energy storage system utilizing the water vapor ad/desorption cycle of zeolite; a sugar mill in Tanegashima, Japan, was used as an example. A fixed-bed test packed with sugarcane bagasse was conducted, and a numerical model was developed for simulating the temperature distribution and the evolution of the outlet vapor pressure in the fixed-bed reactor. Subsequently, the bagasse drying process using a covered bagasse elevator was numerically simulated, and a moisture reduction of 2% was expected. This result was incorporated into the process simulation, to evaluate the relationship between additional power generation and temperature as well as the flow rate of unused heat for thermal energy storage. Finally, this relationship was incorporated into the numerical design of a heat-charging device, to evaluate the effect of bagasse drying on the thermal energy storage system. The coefficient of performance (COP) of the heat-charging system with bagasse drying was 1.6 times higher than that without bagasse drying.