5000t/d干法水泥线余热发电热工参数的计算分析  

Calculation Analysis of the Thermotechnical Parameters of a Waste-heat Power Generation System in a 5000 t/d Dry-method Cement Production Line

作　　者：董陈[1] 赵钦新[1] 周屈兰[1] 徐通模[1] 

机构地区：[1]西安交通大学能源与动力工程学院,陕西西安710049

出　　处：《热能动力工程》2009年第2期182-187,共6页Journal of Engineering for Thermal Energy and Power

基　　金：国家863计划基金资助项目(2007AA05Z251);国家重点基础研究发展计划(973)基金资助项目(2005CB221206);十一五国家科技支撑计划基金资助项目(2006BAK02B03)

摘　　要：针对某5000t/d新型干法水泥窑系统设计了纯低温余热双压发电系统,对系统各个参数进行了理论计算分析,得到了双压系统中主蒸汽温度和压力、给水温度、高压节点温差和接近点温差、低压蒸汽温度和压力、低压节点温差和接近点温差、系统给水温度对系统发电功率的影响规律。计算结果表明:影响水泥窑余热系统发电功率的因素较多,在进行余热发电系统设计时,应对系统发电功率和经济性进行综合考虑,以选取优化参数。在计算的各工况中,当窑尾余热锅炉主蒸汽温度为300℃、主蒸汽绝对压力为1.6MPa、给水温度为170℃、高压低压节点温差为15℃、高压低压接近点温差为11℃;窑头余热锅炉低压蒸汽温度为180℃、低压蒸汽绝对压力为0.25MPa、系统给水温度为50℃,汽轮机背压为8kPa时,系统发电功率是最大的,达到13791.878kW。For a 5 000 t/d new type dry-method cement kiln system,a pure low-temperature dual-pressure waste-heat power generation system was designed,and a theoretical calculation analysis of various parameters of the system,performed.Obtained was a law governing the influence on the power generated by the system by the following items:main steam temperature and pressure,feedwater temperature,high-pressure node temperature difference and approach point temperature difference,low-pressure steam temperature and pressure,low-pressure node temperature difference and approach point temperature difference as well as system feedwater temperature within the system mentioned earlier.The calculation results show that a relatively large number of factors have a bearing on the power generated by the cement kiln waste-heat power generation system.When a waste-heat power generation system is being designed,its power generated and cost-effectiveness should be comprehensively considered in order to choose optimum parameters.Among the various operating conditions being calculated,i.e.when for the waste-heat recovery steam generator at the tail portion of the kiln the main steam temperature is 300 ℃,the main steam absolute pressure,1.6 MPa,feedwater temperature,170 ℃,both high and low pressure node temperature differences,15 ℃,and both the high and low pressure approach point temperature differences,11 ℃,the low-pressure steam temperature of the heat-recovery steam generator at the head of the kiln,180 ℃,low-pressure steam absolute pressure,0.25 MPa,the system feedwater temperature,50 ℃,and the back pressure of the steam turbine,8 kPa,to sum up,under the condition of all the above items,the power generated by the system will be maximal,reaching 13 791.878 kW.

关 键 词：水泥线 余热发电系统 热工参数 计算分析 

分 类 号：TM617[电气工程—电力系统及自动化]