Design of a Coal Drying System with Solar-Assisted Heat Pump and Waste Heat Utilisation

IF 0.9 Q4 THERMODYNAMICS

International Journal of Thermodynamics Pub Date : 2023-04-04 DOI:10.5541/ijot.1219737

M. Ökten

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引用次数: 0

Abstract

The increase in global energy demand has directed researchers towards making low-quality coals into an environmentally friendly energy source by reducing their high moisture content. Drying coal is a high-energy and time-consuming process, so reducing the required energy and drying time is crucial for drying technology. Coal drying increases the thermal value of coal and makes it easier to transport. In this study, a coal drying system was designed using waste heat recovery systems, R-134a refrigerant as working fluid, air source heat pumps, and vacuum tube solar collectors to provide hot air. Firstly, the moisture content of the coal and the desired moisture content after drying were determined, and then the heat required to dry the coal was calculated. Next, the capacity of the solar collector required to provide the necessary heat to the heat pump was determined, and the type and capacity of the heat pump that could produce the required heat were selected. Finally, the coal dryer was designed based on the specific requirements of the power plant and the type of coal used. As a result, the coal drying system designed with solar-assisted heat pumps and waste heat utilization can increase the efficiency of coal-fired power plants by reducing the moisture content of coal before combustion.

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太阳能热泵及余热利用的煤干燥系统设计

全球能源需求的增加促使研究人员通过降低低质量煤炭的高水分含量，将其转化为环保能源。干燥煤是一个高能量、耗时的过程，因此减少所需的能量和干燥时间对干燥技术至关重要。煤炭干燥增加了煤炭的热值，使其更易于运输。在本研究中，设计了一个煤干燥系统，使用废热回收系统、R-134a制冷剂作为工作流体、空气源热泵和真空管太阳能收集器来提供热空气。首先，确定了煤的含水量和干燥后所需的含水量，然后计算了干燥煤所需的热量。接下来，确定了向热泵提供必要热量所需的太阳能收集器的容量，并选择了能够产生所需热量的热泵的类型和容量。最后，根据电厂的具体要求和所用煤的类型，设计了干煤机。因此，采用太阳能热泵和余热利用设计的煤炭干燥系统可以通过降低燃烧前煤炭的含水量来提高燃煤发电厂的效率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Thermodynamics THERMODYNAMICS-

CiteScore

1.50

自引率

12.50%

发文量

期刊介绍： The purpose and scope of the International Journal of Thermodynamics is · to provide a forum for the publication of original theoretical and applied work in the field of thermodynamics as it relates to systems, states, processes, and both non-equilibrium and equilibrium phenomena at all temporal and spatial scales. · to provide a multidisciplinary and international platform for the dissemination to academia and industry of both scientific and engineering contributions, which touch upon a broad class of disciplines that are foundationally linked to thermodynamics and the methods and analyses derived there from. · to assess how both the first and particularly the second laws of thermodynamics touch upon these disciplines. · to highlight innovative & pioneer research in the field of thermodynamics in the following subjects (but not limited to the following, novel research in new areas are strongly suggested): o Entropy in thermodynamics and information theory. o Thermodynamics in process intensification. o Biothermodynamics (topics such as self-organization far from equilibrium etc.) o Thermodynamics of nonadditive systems. o Nonequilibrium thermal complex systems. o Sustainable design and thermodynamics. o Engineering thermodynamics. o Energy.