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1、兰州交通大学毕业设计(论文)I摘摘 要要 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。 本次设计为 300MW 机组热力部分局部初步设计,设计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。设计主要内容如下；第一，是对发电厂主要设备的确定，主要是汽轮机，锅炉型号的选择。汽轮机的选择包括汽轮机进汽压力、温度、结构的选择，锅炉部选择部分包括锅炉最大连续蒸发量，过热器出口压力，温度，锅炉效率,汽包压力的选择。第二，是对锅炉燃烧系统及其设
2、备的选择锅炉，燃料选择义马烟煤，根据煤的成分分析选择磨煤机，然后选择制粉系统， 最后选择合适的风机。第三，是原则性热力系统的拟定和计算。第四，汽轮机辅助设备的选择，凝汽式发电厂应选择凝汽式机组。其单位容积应根据系统规划容量，负荷增长速度和电网结构等因素进行选择。辅机一般都随汽轮机本体配套供应，只有除氧器水箱、凝结水泵组、给水泵、锅炉排污扩容器等，不随汽轮机本体成套供应。第五，进行全面性热力系统的拟定，其中系统的拟定包括主蒸汽管道系统的拟定，再热机组旁路系统的拟定，给水管道系统的拟定，回热加热器管道系统的拟定，除氧器管道系统的拟定，补充水管道系统的拟定，排污扩容器及排污冷却器管道系统的拟定，轴封
3、管道系统的拟定，制粉系统的拟定等。第六，绘制机组局部全面性热力系统图。 关键词：汽轮机关键词：汽轮机, ,锅炉锅炉, ,热力系统，辅机形式热力系统，辅机形式兰州交通大学毕业设计(论文)IIAbstract This design is once complete fossilfired power plant dynamic system designs.The designfor the thermal part of the 300MW unit of local preliminary design, the design during the design selection only
4、 in accordance with the standards of safety and economic optimization does not take into account other factors.First,choosing the main equipment in the power plant includes choosing the turbine and boiler.Which includes the steam turbine inlet pressure,temperature,structure and boiler maximum contin
5、uous evaporation,superheated steam outlet pressure,temperature, boiler efficiency,.drum pressure.Second,making the choice between boiler combustion system and its equipments:YI Ma bituminous coal is our choice fuel in boiler, coal pulverizer according to compositionanalysis choice, then is the syste
6、m power system, finally is proper fan.Third, sketching of the power plant principal thermodynamic system and calculation.Forth,choosing the main equipments of machine in steam turbine that lends support to the equipments: The condenser type should suit condenser type machine . Its unit capacity shou
7、ld program the capacity according to the system, carrying to increase the peed to proceed the choice with power grid consideration construction etc. Assist the machine to supply with the steam turbine essence kit generally and all, only divided by deaerator, condensation pump group, radiator, feedwa
8、ter and boiler blow down enlarger etc, not with steam turbine essence set supply.Fifth,sketching of the power plant overall thermodynamic system and calculation,. Which developed the system, including the formulation of the main steam piping system, reheat unit bypass system in the formulation,devel
9、opment of water supply piping system, heat recovery heater piping system formulation, the formulation of oxygen pipeline system to supplement the proposed water pipeline system sewage and sewage expansion devices proposed pipeline system cooler, seal piping systems in the formulation, the formulatio
10、n of the milling system, etc.Sixth, make sure to regenerate overall thermodynamic system diagram. Key words: Thermal power plants; Thermal power system; Thermal power equipment; Preliminary design 兰州交通大学毕业设计(论文)III目录目录摘 要 .I绪论.11 原则性热力系统的拟定和计算.31.1 国产 300MW 机组发电厂原则性热力系统的拟定.31.1.1 内容及要求.31.1.2 主要原始资料.31.2 锅炉型式和有关数据：.51.3 其它资料： .51.4 轴封系统见图，有关参数如下：.51.5 原则性热力系统的拟定.61.6 热力系统图 .71.7 轴封漏汽量及门杆漏汽量的计量及整理.91.7.1 轴封漏汽计算.91.7.2 门杆漏汽量的整理 .101.8 锅炉连续排污系统的计算.111.8.1 给水焓的计算： .111.8.2 排污扩容器.112 汽轮机辅助设备选择.172.1 除氧器及给水箱的选择 .172.1.1 除氧器的选择.172.1.2 给水箱的选择 3 .182.2 给水泵的选择 .
