300MW机组热力系统与通流部分管道设计计算

内蒙古科技大学毕业设计说明书

摘要

本设计为对某发电厂的热力系统计算与通流部分管道的设计，要以最大连续蒸发量为1025t/h的锅炉及一个机组容量为300MW的汽轮机组的初始数据通过原则性热力系统的确定及计算、燃烧系统的计算及绘制，全面性热力系统的确定及计通流部分管道的设计。可行方案的选取上从实际工程项目出发，综合考虑安全可靠、经济使用，节省能源，保护环境的建设方针，同时对运行是否稳定可靠，技术是否成熟等方面进行考虑，综合比较确定。

本设计主要是对全厂的热力计算及对管道通流部分的计算及管道的选择，同时要校核相关汽水流量、进气量、发电量。根据原则性计算结果对相关热力管道进行相关基本尺寸计算，根据基本尺寸参照相关标准热力管道选型手册选择相关标准管道，并对所选管道进行相关校核计算，纠正所选管道型号，优化电厂热力系统。

最终得出电厂初步设计的相关系统确定，得出经济性较高，有建设价值的电厂建设方案。

关键词：热力系统；热经济性；管道通流部分

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内蒙古科技大学毕业设计说明书

Abstract

The design is of a power plant system calculation and design of the pipeline flow path, To use the greatest amount of continuous evaporation of 1025t / h boiler and a capacity of 300MW steam turbine units of the initial data set Determined by principle and calculation of thermodynamic system Calculation and drawing combustion system Comprehensive system of identification and total heat flow path design of the pipeline. The selection of options from the actual project start, Considering safe, economic use, save energy, protect the environment-building policies, while running is stable and reliable, whether the technology is mature and other aspects to consider, determine the comprehensive comparison.

The design of the whole plant is mainly thermal calculation and the calculation of the flow section of pipe and piping options, while checking the relevant soft drinks flow, gas flow, power generation. According to the results of principle related to heat pipes on the related calculation of basic dimensions, reference to the relevant standards under the basic dimensions of heat pipe select the relevant standards manual channel selection, and check the selected channel of the relevant calculation, correcting the selected channel model, optimal power plant thermal system. Eventually come to the preliminary design of small thermal power plants to determine the relevant systems, construction of thermal power plants in this small economy higher, with construction value.

Key word: Thermal systems; hot economy; Pipeline Flow Path

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内蒙古科技大学毕业设计说明书

目录

摘要................................................................................................................................ I Abstract ......................................................................................................................... II 目录................................................................................................................................ 1 前言................................................................................................................................ 1 第一章 设计概述.......................................................................................................... 2

1.1设计依据........................................................................................................... 2 1.2设计可行性....................................................................................................... 2 1.3设计内容........................................................................................................... 2 第二章 原则性热力系统计算...................................................................................... 3

2.1热力系统相关已知参数................................................................................... 3

2.1.1汽轮机形式及参数................................................................................. 3 2.1.2锅炉型式及参数..................................................................................... 4 2.1.3回热加热系统参数................................................................................. 4 2.1.4其他数据................................................................................................. 4 2.1.5简化条件................................................................................................. 5 2.1.6设计所用原则性热力系统图................................................................. 5 2.2相关系统设备原则性热力计算部分............................................................... 5

2.2.1回热系统有关参数................................................................................. 5 2.2.2各计算点的参数..................................................................................... 6 2.2.3在h-s图上作汽轮机的蒸汽膨胀过程线 .............................................. 8 2.2.4锅炉连续排污利用系数及其有关流量的计算..................................... 9 2.2.5各项抽汽系统计算............................................................................... 10 2.2.6汽轮机汽耗量及各项汽水流量的计算............................................... 13 2.3功率核算......................................................................................................... 14 第三章 全厂热经济性指标计算.............................................................................. 16

3.1 锅炉参数........................................................................................................ 16

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内蒙古科技大学毕业设计说明书

3.2汽轮机做功的蒸汽为..................................................................................... 17 3.3锅炉有效热量q1 ............................................................................................ 17 第四章 全面性热力系统的拟定及其辅助设备........................................................ 19

4.1热力系统......................................................................................................... 19 4.2主蒸汽系统..................................................................................................... 19 4.3再热蒸汽系统................................................................................................. 20 4.4轴封蒸汽系统................................................................................................. 21 4.5旁路系统......................................................................................................... 22 4.6给水系统及其设备......................................................................................... 23 4.7加热器疏水及排气系统................................................................................. 24 4.8真空抽汽系统................................................................................................. 25 4.9辅助蒸汽系统................................................................................................. 25 4.10凝结水系统及其设备................................................................................... 26 4.11循环水系统 ................................................................................................... 27 第五章 管道计算与选型............................................................................................ 28

5.1管道计算所用相关资料................................................................................. 28

5.1.1推荐流速资料....................................................................................... 28 5.1.2 相关计算公式...................................................................................... 29 5.2具体管道管径计算......................................................................................... 29

5.2.1主蒸汽相关管道................................................................................... 29

5.2.1.1 主蒸汽母管管径计算............................................................. 30 5.2.1.2 主蒸汽支管（汽机进气管）计算......................................... 30 5.2.2 第一级抽汽管道内径的计算............................................................ 30 5.2.3 第二级抽汽管道内径的计算............................................................ 30 5.2.4 第三级高压加热器H3抽汽管道的计算 .......................................... 31 5.2.5 通除氧器管道的计算........................................................................ 31 5.2.6 低压加热器H5相关抽汽管道的计算 .............................................. 32 5.2.7 低压加热器H6相关抽汽管道的计算 .............................................. 32 5.2.8 低压加热器H7相关抽汽管道的计算 .............................................. 32

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内蒙古科技大学毕业设计说明书

5.2.9低压加热器H8相关抽汽管道的计算 ................................................. 33 5.2.10 排汽管道管径的计算........................................................................ 33 5.2.11 锅炉给水管道支管管径的计算 ...................................................... 33 5.3 管道的选型.................................................................................................. 34

5.3.1 主蒸汽相关管道选型........................................................................ 34

5.3.1.1 主蒸汽母管选型..................................................................... 34 5.3.1.2 主蒸汽支管管选型（即：汽机进汽管）............................. 35 5.3.2 第一级抽汽管路选型.......................................................................... 36 5.3.3 第二级抽汽管道选型........................................................................ 36 5.3.4 低压加热器H3抽汽管道选型 ............................................................ 37 5.3.5 通除氧器抽汽管道选型...................................................................... 38 5.3.6 低压加热器H5抽汽管道选型 .......................................................... 38 5.3.7 低压加热器H6抽汽管道选型 ............................................................ 39 5.3.8 低压加热器H7相关抽汽管道选型 .................................................. 40 5.3.9 低压加热器H8抽汽管路选型 .......................................................... 40 5.3.10 汽机排汽管道选型............................................................................ 41 5.3.11 锅炉加热器给水支管管路选型 ...................................................... 42

参考文献...................................................................................................................... 44 英文文献...................................................................................................................... 45

原文：................................................................................................................... 45 翻译：................................................................................................................... 60 致谢.............................................................................................................................. 70

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