汽轮机热经济性指标的经济性分析

论文总字数：28041字

摘 要

关键词：汽轮机；热经济指标；计算模型；等效焓降

Thermal Economic Index and Analysis of Steam Turbine

Name xue peng fei

Supervised by wang pei hong su zhi gang

Abstract： The thermal economic index of steam turbine,which contains internal efficiency, thermal efficiency, heat consumption rate and coal consumption rate etc,is a important index to measure the thermal economy of steam turbine,it is also basis of the the running and improvement of steam turbine.Turbine’s auxiliary equipment is more and more,yet how to calculate the thermal economic index hasn’t been pointed out.Some research is done around how to get accurate thermal economic index under different working conditions in this paper to establish a general calculation model for calculating thermal economic indexes of steam turbine units.In this paper,the 1030MW Ultra super critical thermal power unit of Huaneng Jinling power plant is used to be a calculation example.Firstly, the parameters of the regenerative system under the rated condition should be checked,so is the economic index of non-auxiliary condition.Then,things that should be taken into consider increase gradually,such as steam pump,gland steam leakage,heat utilization coefficient of heaters and the auxiliary Steam system,how to calculate the thermal economic index when considering one or two,or just all of these factors,is the next thing should be done. In order to ensure the accuracy of the calculation results,method of heat balance is used in the first pass calculation,while equivalent enthalpy drop method is used in checking calculation.Finally, a model for calculating the thermal economic index of the steam turbine set under different conditions is set up,the model greatly reduces the complexity of the original calculation steps, as well as a variety of possible computational errors and so on,and is very important for analyzing the influence of each parameter on the thermal economy of the unit.

Key words: steam turbine；thermal economic index；calculating model；equivalent enthalpy

目 录

1 绪论........................................................................1

1.1选题背景及研究现状.........................................................1

1.2选题意义...................................................................1

1.3论文主要研究内容...........................................................1

2 超超临界1000MW汽轮机组原始参数校核.........................................2

2.1 N1030-26.25/600/600汽轮机组主热力系统图...................................3

2.2机组原始数据...............................................................3

2.3 原始数据校核.............................................................. 3

2.3.1 H-S趋势..................................................................3

2.3.2 压损率...................................................................4

2.3.3 端差.....................................................................4

2.4小结.......................................................................5

3 理想情况的热经济指标计算....................................................6

3.1汽轮机主热力系统主要汽水参数...............................................6

3.2加热器内各工质吸放热量计算.................................................6

3.3加热器抽汽份额的热平衡计算.................................................7

3.4热力系统热平衡计算........................................................11

3.5机组热经济性指标..........................................................12

3.6小结......................................................................12

4 考虑汽动泵和加热器热利用系数时的计算方法...................................13

4.1汽动小汽机耗功及耗汽份额的计算............................................13

4.2电动凝结水泵耗功计算......................................................13

4.3各加热器抽汽份额及附加冷源损失的计算......................................14

4.4热力系统热平衡计算........................................................15

4.5机组经济指标..............................................................16

4.6小结......................................................................17

5 考虑轴封漏汽时的计算方法...................................................18

5.1漏汽系统..................................................................18

5.2加热器的热平衡计算........................................................18

5.3热力系统的热平衡计算......................................................20

5.4机组热经济指标计算........................................................22

5.5小结......................................................................23

6 考虑两用机运行方式时分项指标的计算方法.....................................24

6.1方案1的分项热经济指标计算................................................24

6.1.1 加热器的热平衡计算......................................................24

6.1.2 热力系统的热平衡计算....................................................26

6.1.3 机组热经济指标计算......................................................28

6.2不同供热抽汽的影响........................................................29

6.3不同回水率的影响..........................................................29

6.4小结 .....................................................................29

7 等效焓降法.................................................................31

7.1 1000MW汽轮机理想主热力系统计算..........................................31

7.1.1 计算各加热器的等效焓降................................................. 32

7.1.2 热效率计算..............................................................33

7.2考虑给水泵及凝泵耗功及加热器效率..........................................33

7.2.1 计算各加热器的等效焓降..................................................34

7.2.2 热效率计算..............................................................35

7.3考虑轴封漏汽..............................................................35

7.3.1 轴封漏气净损失功........................................................35

7.3.2 热效率计算..............................................................37

7.4两用机运行方式............................................................38

7.4.1 厂用抽汽净损失功........................................................38

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