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1、密级:内部300MW火电机组机务部分局部初步设计专业班级: 指导教师:毕业设计任务书一、设计题目:300MW火电机组机务部分局部初步设计二、设计目的:1在理论上熟练掌握电厂各主要设备和系统的工作原理。2通过绘制局部全面性热力系统图,熟练掌握300MW机组全面性热力系统。3掌握一般工程设计的设计步骤。4进一步提高理论水平和提高运用所学理论知识的能力。5培养查阅科技资料和独立设计的能力。三、设计要求:1熟练掌握300MW机组全面性热力系统,完成电厂的局部设计。2发扬刻苦钻研的精神,认真对待此次毕业设计并完成设计任务。四、设计任务:1.锅炉燃烧系统及其设备的选择(1)燃烧系统的计算(2)制粉系统的确
2、定(3)磨煤机的选择(4)给煤机的选择(5)送风机、一次风机的选择(6)引风机的选择(7)除尘器的选择2.原则性热力系统的拟定、计算(1)给水回热和除氧器系统的拟定(2)补充水系统的拟定(3)锅炉连续排污利用系统的拟定(4)绘制原则性热力系统图(5)绘制汽轮机热力过程线及汽水综合参数表(6)锅炉连续排污利用系统的计算(7)回热系统计算(8)汽轮机总汽耗量及各项汽水流量计算(9)热经济指标计算3.汽机车间主要设备的确定(1)配备设备的选择(包括凝汽器、高压加热器、低压加热器、轴封冷却器、真空泵等)(2)给水泵的选择(3)凝结水泵的选择(4)除氧器及给水箱的选择(5)低压加热器疏水泵的选择(6)连
3、续排污扩容器和定期排污扩容器的选择(7)疏水扩容器的选择(8)疏水箱及疏水泵的选择(9)工业水泵及生水泵的选择4.供水方式的确定和循环水泵的选择5.全面性热力系统的拟定(1)主蒸汽管道系统(2)再热机组旁路系统(3)主给水管道系统(4)主凝结水管路系统(5)回热加热器管道系统(6)除氧器及给水箱管道系统(7)轴封管道系统(8)补充水管道系统(9)排污扩容器及排污冷却器管道系统(10)真空及空气管道系统(11)给水箱和低位水箱管道系统6.绘制系统图(见具体绘图要求)五、设计时间: 2011年9月21日至2011年10月14日六、成绩评定:根据设计出勤情况、论文编写情况和答辩情况综合评定,成绩等级
4、:优秀、良好、中等、及格、不及格。七、参考资料:1.热力发电厂2.汽轮机原理3.锅炉原理4.300MW机组热力系统图5.300MW机组运行规程6.火力发电厂设计技术规程八、设计参数:锅炉系统的设计参数按照锅炉原理教材P26,表2-8进行,按学号分配;汽轮机部分的设计按给定工况参数计算,即初压为16.67XXMPa,初温为537.XX,XX为学号。设计参数:每人使用自己的设计参数。根据要求选定下列参数作为计算参数。锅炉系统的设计参数按照下表进行,热力系统部分的设计按给定工况参数计算。序号姓名煤种元素成分应用基低位发热量Qar,net,p; (kJ)/kg空气干燥水分干燥无灰基挥发分 VdafBT
5、M法可磨性系数Kkm水分Car(%)灰分Har(%)碳Oar(%)氢Nar(%)氧Sar(%)氮Mar(%)硫Aar(%)设计参数分配: 摘 要300MW级燃煤机组是我国在近阶段重点的火力机组,由于300MW发电机组具有容量大,参数高,能耗低,可靠性高,对环境污染小等特点,今后在全国将会更多的300MW级发电机组投入电网运行。本次设计的目的是通过对300MW火力发电厂热力系统局部的初步设计,掌握火力发电厂热力系统初步设计的步骤、计算方法及设计过程中设备的选择方法,熟悉热力系统的组成、连接方式和运行特性。本文分为四部分,对锅炉燃烧系统及其设备进行选择,进行原则性热力系统的拟定计算、全面性热力系统
6、的拟定和汽机主要辅助设备的确定。通过一些给定的基本数据和类型进行科学的计算,来选配发电机组所需的各种设备,使其达到优化。目前有关300MW机组所需的各种设备种类繁多、参数各异,本文在进行设计选型时仅依照安全经济的标准进行优化没有考虑其他影响因素,充分借鉴铁岭发电厂设备选型及其方案。300MW级燃煤机组是我国在近阶段重点的火力机组,由于300MW发电机组具有容量大,参数高,能耗低,可靠性高,对环境污染小等特点,今后在全国将会更多的300MW级发电机组投入电网运行。本次设计的目的是通过对300MW火力发电厂热力系统局部的初步设计,掌握火力发电厂热力系统初步设计的步骤、计算方法及设计过程中设备的选择
7、方法,熟悉热力系统的组成、连接方式和运行特性。本文分为四部分,对锅炉燃烧系统及其设备进行选择,进行原则性热力系统的拟定计算、全面性热力系统的拟定和汽机主要辅助设备的确定。通过一些给定的基本数据和类型进行科学的计算,来选配发电机组所需的各种设备,使其达到优化。目前有关300MW机组所需的各种设备种类繁多、参数各异,本文在进行设计选型时仅依照安全经济的标准进行优化没有考虑其他影响因素,充分借鉴铁岭发电厂设备选型及其方案。关 键 词:火力发电厂 热力系统 初步设计 设备选择 Pick to 300 MW coal-fired unit level in China is the focus of t
8、he fire in the closing stages of unit, due to the 300 MW generator with large capacity, the parameters of high, low energy consumption, high reliability, low pollution to the environment characteristics, such as in the future will be more 300 MW generator power network operation investment grade. Th
9、is is designed to 300 MW coal-fired power plants by thermal system of local preliminary design, and master the thermal system in thermal power plant is the preliminary design of the steps, the calculation and design process of the equipment selection method, familiar with the composition of the ther
10、mal system, connecting method and operation characteristics. This paper is divided into four parts, to the boiler combustion system and its equipment choice, thermal system worked on the principle of thermal system calculation, comprehensive worked the turbine and determination of the main auxiliary
11、 equipment. Through some of the given basic data and types of scientific calculations, to matching generator needs many kinds of equipment, make its reach optimization. Currently about 300 MW unit needs many kinds of equipment various kinds and different parameters, this article only in the model se
12、lection of the design in accordance with the standard of safe and economic optimized to did not consider other factors, fully absorb tieling power plant equipment selection and its solutions. 300 MW coal-fired unit level in China is the focus of the fire in the closing stages of unit, due to the 300
13、 MW generator with large capacity, the parameters of high, low energy consumption, high reliability, low pollution to the environment characteristics, such as in the future will be more 300 MW generator power network operation investment grade. This is designed to 300 MW coal-fired power plants by t
14、hermal system of local preliminary design, and master the thermal system in thermal power plant is the preliminary design of the steps, the calculation and design process of the equipment selection method, familiar with the composition of the thermal system, connecting method and operation character
15、istics. This paper is divided into four parts, to the boiler combustion system and its equipment choice, thermal system worked on the principle of thermal system calculation, comprehensive worked the turbine and determination of the main auxiliary equipment. Through some of the given basic data and types of scientific calculations, to matching generator needs many kinds of equipment, make its reach optimization. Currently about 300 MW unit nee