【作者】 梁岩；

【导师】 高明；

【作者基本信息】 山东大学 ， 动力工程（专业学位）， 2017， 硕士

【摘要】 随着工业技术的进步,空冷机组向着超临界、超超临界方向发展,同时带动了锅炉给水泵技术的发展。锅炉给水泵作为驱动工质的循环流动的设备,随着机组容量的增大,给水泵功率也逐渐增大。由于电动给水泵能耗巨大,而汽动给水泵主机背压容易受到外部条件的影响,且系统复杂,投资较大,故研究新型给水泵技术势在必行。基于此,汽轮机同轴驱动给水泵(以下称为主机泵)配置方案得到广泛关注。本文首先针对汽动给水泵,电动给水泵和主机泵配置方案,基于等效焓降法,分别建立了其系统经济分析计算模型,包括汽轮机内功率,机电效率,发电热耗,发电煤耗,厂用电率等方面,并给出了锅炉给水泵系统经济性评价标准,评价指标主要包括初投资、年供电量、厂用电率、供电煤耗、年利润以及投资回收年限。其次,在热耗率验收工况(Turbine Heat Acceptance condition,THA)、汽轮机额定功率工况(Turbine Rated load condition,TRL)、汽轮机最大连续功率工况(Turbine Maximum Continuous Rating condition,TMCR)以及阀门全开工况(Valve Whole Open condition,VWO)四个运行工况下,以 350MW、600MW、1000MW 机组为例,对比分析了不同给水泵配置方案的经济效益。与电动给水泵配置方案相比,汽动给水泵和主机泵方案初投资更高,对于350MW机组,以THA工况为例,汽动给水泵和主机泵方案的年供电量分别高出0.42%和0.31%,厂用电率分别降低了 3.144%和 3.139%,供电煤耗分别降低了 1.32g/(kW·h)和 0.98g/(kW·h),此外,年利润分别高出508.2万和377.3万元,表明350MW机组配置汽动给水泵的经济效益最好;对于600MW机组,汽动给水泵和主机泵方案年供电量分别高于0.11%和0.3%,厂用电率分别降低3.18%和3.19%,供电煤耗分别降低0.36g/(kW·h)和0.94g/(kW-h),同时,年利润分别高出237.6万和620.4万元;对于1000MW机组,汽动给水泵和主机泵方案年供电量分别增加0.01%和0.32%,厂用电率分别降低3.12%和3.14%,供电煤耗分别降低0.03g/(kW·h)和0.95g/(kW·h),并且年利润分别高出33万和1045万元,结果表明600MW和1000MW机组主机泵配置方案各项指标优于汽动给水泵配置方案,经济效益最高。随后,以典型600MW/1000MW等级机组调速驱动系统为例,对主机泵传动装置的实现方案进行探讨,重点研究了齿轮箱,联轴器和调速设备的实现方案,确定了调速系统设备的选型,其中齿轮箱采用福伊特BHS常规的平行轴齿轮箱传递功率,联轴器可采用膜盘式和齿型联轴器传递扭矩,调速系统的调试设备采用节能效果更好的调速之星,并使用PLC控制系统实现对整个系统的控制。最后,本文研究了汽轮机安装主机泵的实现方案,分析了主机泵安装方案中的难点,主要包括汽轮机整体布置结构,运行和监控系统配置,以及保护和调节系统的构造,并明确了不同设备的作用用途,为下一步主机泵配置方案的在电厂中的应用和实现提供了理论指导。更多还原

【Abstract】 With the development of industrial technology,the air cooling unit develops towards the supercritical and ultra-supercritical direction,which also promotes the development of boiler feed water pump technology.As the circulating flow equipment of driving working medium,the power of feed water pump increases with the increase of unit capacity.Because the energy consumption of electric driven feed water pump is huge,in addition,the back pressure of steam driven feed water pump is affected by external conditions,and the system is complex,the investment is large,so it is imperative to study a new feed water pump technology.Therefore,the configuration of feed water pump coaxially driven by turbine receives widespread attention.Firstly,based on equivalent heat drop method,the economic analysis model of steam driven feed water pump,electric driven feed water pump,as well as feed water pump coaxially driven by turbine configuration scheme is established,which including the internal power of steam turbine,electrical efficiency,heat consumption,coal consumption and auxiliary power consumption.Besides,the economic evaluation standard of boiler feed water pump system is established,and the standard mainly includes initial investment,annual power supply,auxiliary power consumption,coal consumption,annual profit and payback period of investment.Secondly,under the Turbine Heat Acceptance condition(THA),Turbine Rated load condition(TRL),Turbine Maximum Continuous Rating(TMCR)and the Valve Whole Open condition(VWO),the economic benefits of different boiler feed water pump configuration scheme are analyzed under 350MW,600MW and 1000MW unit.Compared with electric driven feed water pump configuration scheme,the initial investment of steam driven feed water pump and feed water pump coaxially driven by turbine are much higher,for the 350MW unit,under THA condition,the annual power supply of steam driven feed water pump and feed water pump coaxially driven by turbine increases by 0.42%and 0.31%,and the auxiliary power consumption decreases by 3.144%and 3.139%,in addition,the coal consumption decreases by 1.32g/(kW·h)and 0.98g/(kW·h),what’s more,the annual profit increases by 5.082 million and 3.773 million yuan,respectively,which means that the economic benefits of steam driven feed water pump under 350MW is higher than other configuration scheme.And for 600MW unit,the annual power supply of steam driven feed water pump and feed water pump coaxially driven by turbine increases by 0.11%and 0.3%,and the auxiliary power consumption decreases by 3.18%and 3.19%,meanwhile,the coal consumption decreases by 0.36g/(kW·h)and 0.94g/(kW·h),and the annual profit increases by 2.376 million and 6.204 million yuan,respectively.For 1000MW unit,the annual power supply of steam driven feed water pump and feed water pump coaxially driven by turbine increases by 0.01%and 0.32%,and the auxiliary power consumption decreases by 3.12%and 3.14%,meanwhile,the coal consumption decreases by 0.03g/(kW·h)and 0.95g/(kW·h),and the annual profit increases by 33 thousand and 10.45 million yuan,respectively,which could conclude that every index of configuration scheme of feed water pump coaxially driven by turbine is better than that of steam driven feed water pump under 600MW and 1000MW unit.Afterwards,to analyze the implementation scheme of transmissions device for feed water pump coaxially driven by turbine,taking the speed control drive system of a typical 600MW/1000MW grade unit as an example,then the implementation of gearbox,coupling and speed control device,as well as the equipment selection of speed control system are discussed.The gearbox adopts the Forit BHS conventional parallel shaft gearbox to transmit power,and the coupling could use the membrane disk type and gear type to transmit torque,additionally,the speed regulating system is equipped with the star of speed control with better energy saving effect,and then the Programmable Logic Controller(PLC)control system is adopted to realize the control of the whole system.Finally,the installation of feed water pump coaxially driven by turbine is studied.And the difficulties in installation process,which including the overall arrangement structure,operating and monitoring system,the protection and adjustment system,as well as the effect of different equipment are mainly analyzed.This paper could provide theoretical guidance for the implementation of feed water pump coaxially driven by turbine in power plant.更多还原