Energetic and exergetic analysis of waste heat recovery systems in the cement industry
Energetic and exergetic analysis of waste heat recovery systems in the cement industry
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DOI：
10.1016/j.energy.2013.03.097
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发表时间：
2013-09-01
期刊：
影响因子：
9
通讯作者：
Kakaras, E.
中科院分区：
文献类型：
--
作者：
Karellas, S.;Leontaritis, A-D;Kakaras, E.
在典型的水泥生产过程中，所使用的总能量的25%是电能，75%是热能。然而，该方法的特征在于主要由烟道气和用于冷却熟料的环境空气流造成的显著热损失（约为过程热损失的35%-40%）。由于粉尘、熟料排放、窑和预热器的辐射和对流损失，系统约有26%的热量输入损失。热回收系统可用于提高水泥厂的效率，从而有助于减少排放。本文的目的是检查和比较能量和火用，两种不同的WHR（废热回收）方法：水蒸汽朗肯循环，和有机朗肯循环（ORC）。参数研究证明，在废气温度高于310摄氏度的情况下，水蒸汽技术比ORC更有效。最后，对最有效的解决方案进行了简要的经济评估。水泥工业中的余热回收装置可以显著降低电力消耗和运营成本，因此是一项非常有吸引力的投资，投资回收期长达5年。(C)2013爱思唯尔有限公司保留所有权利。
In a typical cement producing procedure, 25% of the total energy used is electricity and 75% is thermal energy. However, the process is characterized by significant heat losses mainly by the flue gases and the ambient air stream used for cooling down the clinker (about 35%-40% of the process heat loss). Approximately 26% of the heat input to the system is lost due to dust, clinker discharge, radiation and convection losses from the kiln and the preheaters. A heat recovery system could be used to increase the efficiency of the cement plant and thus contribute to emissions decrease. The aim of this paper is to examine and compare energetically and exergetically, two different WHR (waste heat recovery) methods: a water-steam Rankine cycle, and an Organic Rankine Cycle (ORC). A parametric study proved that the water steam technology is more efficient than ORC in exhaust gases temperature higher than 310 degrees C. Finally a brief economic assessment of the most efficient solution was implemented. WHR installations in cement industry can contribute significantly in the reduction of the electrical consumptions operating cost thus being a very attractive investment with a payback period up to 5 years. (C) 2013 Elsevier Ltd. All rights reserved.