Application of a low pressure economizer for waste heat recovery from the exhaust flue gas in a 600 MW power plant
Application of a low pressure economizer for waste heat recovery from the exhaust flue gas in a 600 MW power plant
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低压省煤器在600MW电厂烟气余热回收中的应用
DOI：
10.1016/j.energy.2012.01.045
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发表时间：
2012-12-01
期刊：
影响因子：
9
通讯作者：
Pei, Xiaohui
中科院分区：
文献类型：
--
作者：
Wang, Chaojun;He, Boshu;Pei, Xiaohui
本文介绍了一个600 MW火电厂在进入烟气脱硫塔前回收烟气余热的实例。该废热可以通过安装低压省煤器（LPE）来回收，以加热冷凝水，这可以节省从蒸汽涡轮机提取的蒸汽用于加热冷凝水，然后可以获得额外的功。在一个600 MW燃煤电厂的湿式烟囱的三种情况下，评估了LPE装置的节能节水和减少CO2排放。LPE换热器选用方形翅片管，优化工况下总传热系数为37 W/m（2）·K，静压损失为781 Pa。分析结果表明，在增压风机与烟气脱硫装置之间的排烟系统中安装液体燃料电池是可行的，对机组的负面影响较小。所产生的效益包括：在满负荷运行时，节约标准煤当量（SCE）2-4 g/（kW.h），节水25-35 t/h，并相应减少CO2排放。(C)2012爱思唯尔有限公司保留所有权利。
This paper presents a case study of recovering the waste heat of the exhaust flue gas before entering a flue gas desulphurizer (FGD) in a 600 MW power plant. This waste heat can be recovered by installing a low pressure economizer (LPE) to heat the condensed water which can save the steam extracted from the steam turbine for heating the condensed water and then extra work can be obtained. The energy and water savings and the reduction of CO2 emission resulted from the LPE installation are assessed for three cases in a 600 MW coal-fired power plant with wet stack. Serpentine pipes with quadrate finned extensions are selected for the LPE heat exchanger which has an overall coefficient of heat transfer of 37 W/m(2).K and the static pressure loss of 781 Pa in the optimized case. Analysis results show that it is feasible to install LPEs in the exhaust flue gas system between the pressurizing fan and the FGD, which has little negative impacts on the unit. The benefits generated include saving of standard coal equivalent (SCE) at 2-4 g/(kW.h) and saving of water at 25-35 t/h under full load operation with corresponding reduction of CO2 emission. (C) 2012 Elsevier Ltd. All rights reserved.