文档介绍：4×300MW火力发电厂初步设计
摘要
300MW火电机组是我国电力的重要设备,为我国电力工业的发展做出过很大的贡献,随着今年各大电网负荷增长及峰谷的增大,使得电网中原来300MW的机组已不能满足需要,因此,各大电网开始投入运行600MW火电机组。但就现在来看600MW机组基本是在300MW机组的基础上改造而来的,他们之间有不可分割的关系。因而。对300MW机组动力系统的研究,是非常必要的。
本次设计是一次完全的火力电厂初步设计:
首先,发电厂的原则性热力系统的拟定与计算:凝汽式发电厂的热力系统,锅炉本体汽水系统,汽轮机本体热力系统,机炉车间的连接全厂公用汽水系统四部分组成。
其次,汽轮机主要设备和辅助设备的选择:
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,,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。
第三,对锅炉燃料系统及其设备的选择:
锅炉燃料选择徐州烟煤,根据煤的成分分析选择磨煤机,然后选择制粉系统,最后是对燃料设备的选择。
第四,确定回热热力系统全面性热力系统图:
因采用“三高四低一除氧”八级抽汽回热热力系统,且2号、3号高加间装疏水冷却器,以提高机组的热经济性。
第五,电气部分设计
关键词:汽轮机,锅炉,热力系统,火力发电厂,电气设计
Abstract
The Thesis is a 4×300MW power plant electrical part of the first preliminary design phase of the project. All papers there are instructions and calculations of two parts, the first part of the detailed description of the various equipment options based on the most basic requirements and principles. Transformer options include: power plant main transformers, high voltage power transformer and high voltage auxiliary transformer Number of units, capacity, type and other major technical data identified. Main Electrical Wiring introduces the importance of main electrical wiring, design basis, the basic requirements, advantages and disadvantages of different connection forms the main terminal of parison options, and developed the main requirements for the factory wiring. Auxiliary Power Connection, including: the general requirements of auxiliary power wiring and the auxiliary bus connection design. Short-circuit current calculation in the second part is the most important link in this section describes in detail the purpose of short-circuit current calculation, assuming conditions, a general rule, the calculation of device parameters, network transformation, and the calculation of the short circuit knowledge. The choice of high voltage electrical equipment, including bus, high voltage circuit breaker, disconnecting switch, current transformer, voltage transformer, hig