CNP1500压水堆核电站热力计算及二回路热力系统初步设计

华北水利水电大学毕业设计

CNP1500压水堆核电站热力计算及

二回路热力系统初步设计

摘 要

本设计分为三个部分，分别进行了CNP1500压水堆核电站热力计算及二回路热力系统初步设计。第一部分是依据特定的CNP1500机组的原始资料，选定阀门全开功率工况，基于常规热平衡分析法，用常规的手工计算，以汽轮发电机组的电功率Pe为定值，进行原则性热力系统计算。其计算过程：依据给定原始数据，制作机组回热回热系统计算点参数表，对汽轮机总汽耗量进行估算，然后分别对高、低压加热器组进行各设备的汽耗量进行计算，最后进行汽轮机总汽耗量的校验。

第二部分是根据CNP1500机组的特点和运行规范，设计能够满足全工况运行的热力系统，对本机组的各个局部系统展开探讨和分析。第三部分是依据《管道规定》推荐的管道介质流速，利用连续方程对各蒸汽管道尺寸的进行计算，然后查阅相关国家标准和规范，根据各管道的使用条件 (包括设计温度、设计压力、工作介质类别)、经济性、材料的焊接及加工等特性的不同来选取不同的材料和用钢型号。

本设计通过二回路热力系统的计算结果，可以确定其各个系统结构中影响整个核电站热经济性的主要因素，对改进核电厂热力系统设计，减少燃料消耗，提高电厂经济性和安全性指标具有实际的指导意义。各管道的尺寸、选材直接影响核电厂的使用寿命和经济性。想要核电厂经济，安全的运行。就要深入计算研究二回路热力系统。

关键词：CNP1500，二回路，热力计算，管径，热力系统设计

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华北水利水电大学毕业设计

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华北水利水电大学毕业设计

CNP1500 PWR THERMODYNAMIC CALCULATION AND

SECONDARY LOOP PRELIMINARY DESIGN

Abstract

This design is about the thermodynamic calculation of CNP1500 PWR nuclear power plant and the preliminary design of the secondary circuit thermodynamic system.The paper mainly divided into three steps. The first part is thermodynamic system calculation based on the raw data of specific CNP1500 unit to selected the full power operating conditions of the valve, and the conventional thermal equilibrium analysis method, the conventional manual calculation method together with the fixed value Pe of the electric power of the steam turbine generator set are used.The calculation procedures are as follows: first, making the calculation point parameter table of The Power Plant Regenerative System according to the given initial data in order to estimate the total steam of steam turbine consumption. And then the steam consumption of each equipment in the high and low pressure heater group was calculated separately.Finally, check the total steam consumption of steam turbines.

The second part is to design the thermal system which can meet the needs of the entire operation based on the characteristics and operation specifications of CNP1500 unit. And then discuss and analysis each local system of the unit.Last but not least, the third part is to calculate the dimensions of each steam pipe according to the pipeline medium flow rate recommended by “Regulation Of Pipeline”and the continuity equation. Then, consult the related national standards and specifications to select different materials and steel models of the piping according to the operating conditions of the pipeline (including the design temperature, design pressure, the working medium category), the economic , welding and processing of materials and other characteristics.

Through the calculation results of the thermal system of the second circuit, the main factors which affect the thermal economy of the whole nuclear power plant in its

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华北水利水电大学毕业设计

system structure can be determined. It has an important guiding significance to improve the design of the thermal system, educe fuel consumption, improve the economic and safety index of the power plant. There is no doubt that the size and material selection of the pipelines directly influence the service life and economic of the nuclear power plant. More attention should be paid into thermal system of the second circuit in order to ensure the economic and safe operation of nuclear power plant.

Key Words: CNP1500, The second circuit, Thermodynamic calculation, Pipe diameter Thermodynamic system

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