基于过热蒸汽干燥开式制粉的燃准东煤发电技术  

A Novel Zhundong-coal-fired Power Generation Technology Based on Superheated-steam-dried Open Pulverizing System

作　　者：马有福[1] 王涛[1] 吕俊复[2] 王子睿 马友方 MA Youfu;WANG Tao;LYU Junfu;WANG Zirui;MA Youfang(Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,School of Energy and Power Engineering,University of Shanghai for Science and Technology,200093 Shanghai,China;Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Energy and Power Engineering,Tsinghua University,100084 Beijing,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海市动力工程多相流动与传热重点实验室,上海200093 [2]清华大学能源与动力工程系,教育部热科学与动力工程重点实验室,北京100084

出　　处：《煤炭转化》2022年第6期72-79,共8页Coal Conversion

基　　金：国家重点研发计划项目(2016YFB0600203).

摘　　要：针对准东煤水分较高的特点,提出了基于过热蒸汽干燥开式制粉和制粉乏汽余热深度利用的高效燃煤发电技术。该技术通过采用开式制粉系统,使原煤蒸发水分不进入炉膛,解决了锅炉炉温低和热效率低的问题。采用闭式循环蒸汽作为制粉系统干燥剂,并利用电厂原有磨煤机作为干燥机,用简洁的工艺实现了煤的高效干燥和安全制粉。该技术中制粉系统排出的乏汽为纯蒸汽,易于回收乏汽的热能及水分,可在明显提高锅炉热效率的同时回收大量水资源。本研究介绍了该技术的工作原理,分析了其工程应用可行性,建立了相应发电系统热经济性的理论分析模型,进而以某660 MW超临界燃准东煤(收到基水分质量分数为23.6%)机组的THA(turbineheat acceptance)工况为例,分析了应用该技术的节能与环保效益。结果表明:应用该技术可使机组的标煤发电煤耗降低8.23g/(kW·h)(即节煤2.86%),同时实现水回收42.98t/h,CO_(2)减排17.95 t/h,展示出优越的节能与环保效益。该技术工艺流程简洁、工程可行性佳、运行安全,既可用于新建机组,也适用于现役机组的节能升级改造。In vicw of the high moisture content of Zhundong coal.an efficient coal-fired power generation technology based on superheated-steamr dried open pulverizing system and deep utilization of the waste heat from pulverizing exhaust-steam is proposed.By adopting an open pulverizing system,this technology prevents the evaporated water from the raw coal from entering the furnace.which solves the problems of low furnace temperature and low boiler ther-mal efficiency.F urthermore.this technology uses closed-loop steam as the drying agent of the pulverizing system and uses the original coal mill of the power plant as the dryer.thus realizing in efficient drying and safe pulverizing of coal with a simple process.Moreover,in the process of this technology.the exhauststeam discharged from the pulverizing system is Ppure steam whose latent heat and moisture are casy to be recovered.thus facilitating improving the boiler thermal efficiency and recovering a large amount of water resources.This paper described the working principle of the technology.analyzed its engineering feasibility,and established a theoretical analysis model for the thermal cconomy of the corresponding power generation system.Further-more.taking the THA(turbine heat aceptance)condition of a 660 MW supercritical Zhundong coal-fired(received base moisture 23.6%)unit as an example.the energy saving and environ-mental protection benefits of applying this technology were analyzed.The results show that the application of this technology can reduce the standard-coal consumption of the power unitby 8.23 g/(kW·h)(that is.2.86%of coal saving).Meanwhile.water recovery of 42.98 t/h and CO_(2) emission reduction of 17.95 t/h can be achieved.which presents superior energy-saving and envi-ronmental protection benefits.T his technology has the advantages of simple process.good engi-neering feasibility.and safe operation.It can be used not only for newly built power units.but also for the energy-saving upgrade of existing power units.

关 键 词：火力发电厂 准东煤 开式制粉系统 节能 水回收 

分 类 号：TM621.4[电气工程—电力系统及自动化]