电站锅炉烟气余热利用技术方案研究
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摘要
超临界电站锅炉排烟热损失量很大,对锅炉尾部烟气余热进行回收利用可以有效提高电厂的热经济性,减少煤耗,降低环境污染。目前火电厂最广泛提高烟气余热利用效率的方式是加装低温省煤器装置。对某超临界机组锅炉余热利用技术进行研究,分析不同低温省煤器布置方案,提出采用双级低温省煤器回收电站锅炉余热利用技术方案,即采用低温烟气与低加凝结水换热技术、前置式空气预热器与低温省煤器组合的能源梯级利用方式,实现最优节能及最佳投资收益。
The exhaust heat loss of supercritical power station boilers is very large. Recovery and utilization of waste heat from boiler can effectively improve the thermal economy of power plants, and reduce coal consumption and environmental pollution. At present, the way most widely used to improve the utilization efficiency of flue gas waste heat in thermal power plants is to install low temperature economizer. The waste heat utilization technology of a supercritical unit boiler was studied, different lowtemperature economizer layout schemes were analyzed, and a technical scheme for recovery of waste heat from power plant boiler by using dual-stage low-temperature economizer was proposed, i.e., the combination of low-temperature flue gas and low-condensation water heat exchange technology, the energy of front air pre-heater and low-temperature economizer. The source cascade utilization mode can achieve optimal energy saving and optimal investment return.
The exhaust heat loss of supercritical power station boilers is very large. Recovery and utilization of waste heat from boiler can effectively improve the thermal economy of power plants, and reduce coal consumption and environmental pollution. At present, the way most widely used to improve the utilization efficiency of flue gas waste heat in thermal power plants is to install low temperature economizer. The waste heat utilization technology of a supercritical unit boiler was studied, different lowtemperature economizer layout schemes were analyzed, and a technical scheme for recovery of waste heat from power plant boiler by using dual-stage low-temperature economizer was proposed, i.e., the combination of low-temperature flue gas and low-condensation water heat exchange technology, the energy of front air pre-heater and low-temperature economizer. The source cascade utilization mode can achieve optimal energy saving and optimal investment return.
引文
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[12]安恩科,马健越.加装低压省煤器对汽轮机相对内效率的影响[J].同济大学学报,2010,38(10):1492-1500.
[13]刘传玲,柳明辉,陈振江等.投运低压省煤器后汽轮机背压变化分析[J].发电技术,2018,39(4):378-381.
[14]张俊锋.煤矿烟气余热回收利用技术研究[D].武汉:武汉理工大学,2012.
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[2]黄圣伟,徐钢,杨勇平,等.电站锅炉烟气余热利用的热力学分析与优化设计原则[J].现代电力,2013(1):75-80.
[3]Jung H C,Krumdieck S,Vranjes T.Feasibility assessment of refinery waste heat-to-power conversion using an organic Rankine cycle[J].Energy Conversion and Management,2014,77:396-407.
[4]刘传玲,柳明辉,陈振江,等.投运低压省煤器后汽轮机背压变化分析[J].发电技术,2018,39(4):378-381.
[5]孙飞,刘烨,魏高升,等.火电厂螺杆式空压机余热利用方案及经济性分析[J].发电技术,2018,39(3):240-243.
[6]龙辉,黄晶晶.“十三五”燃煤发电设计技术发展方向分析[J].发电技术,2018,39(1):13-17.
[7]潘雷彬,周振峰,陈燕珍等.汽水热交换器用于低温烟气热回收的节能性研究[J].发电与空调,2015,36(4):56-60.
[8]Hung T C,Shai T Y,Wang S K.A review of organic rankine cycles(ORCs)for the recovery of low-grade waste heat[J].Energy,1997,22(7):661-667.
[9]陈大为,吴红峰.两种余热利用系统性能对比分析[J].发电与空调,2015,36(6):14-18.
[10]罗晴.燃煤电厂烟气低温余热回收利用研究[J].热能动力工程,2017,32(8):1-4.
[11]刘彤,李君,徐钢,等.锅炉前置式空气预热器综合分析与优选[J].华东电力,2013,41(8):1755-1759.
[12]安恩科,马健越.加装低压省煤器对汽轮机相对内效率的影响[J].同济大学学报,2010,38(10):1492-1500.
[13]刘传玲,柳明辉,陈振江等.投运低压省煤器后汽轮机背压变化分析[J].发电技术,2018,39(4):378-381.
[14]张俊锋.煤矿烟气余热回收利用技术研究[D].武汉:武汉理工大学,2012.
[15]朱建国.新疆某电厂#1机组排烟余热回收系统的设计与运行[J].发电与空调,2014,35(4):14-17.