【作者】 郑心伟；

【导师】 姜任秋；

【作者基本信息】 哈尔滨工程大学 ， 动力机械及工程， 2006， 硕士

【摘要】 燃气—蒸汽联合循环得到广泛应用。在该系统中，余热锅炉受到燃气轮机排气参数的制约，同时影响蒸汽侧热力特性，而其烟气阻力的大小又直接影响燃气轮机循环的功率和效率，对联合循环系统效率产生重要影响。因此，本文根据当地环境温度变化的特点，拟定燃气轮机100％负荷时的排气工况，在对特定余热锅炉100％负荷时蒸汽参数进行优化的基础上，完成基于环境温度变化的余热锅炉热力和烟气阻力计算。本文介绍燃气—蒸汽联合循环三种最基本型式的原理和特点，对其进行定性的热力学和应用评价，为以后的研究奠定物理基础。然后，对配有低压蒸发器的补燃式单压余热锅炉型燃气—蒸汽联合循环系统能量进行集成，运用热力学基本理论和数学推导的方法得到该联合循环供电效率的两种表达式，并以余热锅炉不补燃时的联合循环供电效率最大为目标函数，在分析热力和工程约束的基础上，以余热锅炉和汽轮机热工模型为工具，以给定的进入余热锅炉的燃气轮机排气参数为原始数据，对余热锅炉蒸汽参数进行优化计算，对计算结果进行分析、比较和选择，以作为余热锅炉热力性能计算的依据。最后，建立过热蒸汽减温模型，由该模型下的减温热平衡方程及其质量平衡方程得出过热器热平衡方程的等量关系式，以此为基础，对过热器热力计算方法和步骤进行阐述，并使之与已建立的余热锅炉热工模型、标准计算方法中有关内容和工程经验数据相结合，形成该余热锅炉热力计算方法，完成拟定工况下余热锅炉热力和烟气阻力计算。通过分析和计算得到：余热锅炉热力计算方法及其受热面布置的合理性；余热锅炉热力计算方法和蒸汽参数优化模型的适用性：对余热锅炉其它计算、设计和运行的指导作用；过热器出口蒸汽温度、用于减温的饱和蒸汽流量和锅炉烟气阻力的数值及其随燃气轮机排气温度变化的规律。更多还原

【Abstract】 Gas Steam Combined Cycle (GSCC) has been widely applying. In this system, Heat Recovery Steam Generator (HRSG) is restricted by the parameters of exhaust from gas turbine, the thermal characters of steam is also affected by HRSG meanwhile, and the flue gas resistance numerical value of HRSG has the direct effect on the power and efficiency of gas turbine, which influences the whole efficiency of GSCC importantly. In this thesis, the 100% load of gas turbine exhaust working conditions were formulated considering the characters of local environmental temperature variation, basing on the optimization of steam parameters to a given HRSG at 100% load, the thermal and flue gas resistance calculations of this HRSG were carried out on the basis of environmental temperature variation.In this thesis, the principles and characters of three basic types of GSCC were introduced, the qualitative Thermodynamics and application evaluations were carried out firstly, which settled the base for the future research. Then the energy of the GSCC system with Low-Pressured Evaporator (LEP),Supplementary-Firing Burner Unit (SFBU) and single- pressured HRSG was integrated, and two expressing formulas of the former system power supply efficiency were achieved by the basic theory of Thermodynamics and mathematic deducing. Taking the max power supply efficiency of Combined Cycle when HRSG without SFBU as the objective function, basing on the analyses of Thermodynamics and engineering project restraints, using the thermal models of this HRSG and steam gas turbine, taking the given exhaust parameters of coming into this HRSG as original data, the steam parameters of this HRSG were optimized calculated, and the results were analyzed, compared and selected, which were used as the basis for the thermal performance calculations of this HRSG. In the end, the model of reducing superheated steam temperature with saturated steam was built. An equal quantity relationship equation of superheater thermal balance equation was deduced from the thermal and mass balance equations of the reducing temperature model. Basing on the former work, the thermal calculation method and steps on superheater were introduced in detail, which was combined with the built thermal model of this HRSG, the related contents of the standard calculation method and the experimental data from engineering project, thus the calculation method for this HRSG was gained, the thermal and flue gas resistance calculations in the formulated working conditions of this HRSG were carried out.The conclusions gained through analyses and calculations in this thesis as follows:the rationality of thermal calculation method and the arrangement of heating surfaces for this HRSG; the applicability of thermal calculation method and the models of steam parameters optimization; the instructive functions to other calculations, design and operation of this HRSG; the numerical value of superheater exit steam temperature, the flux of saturated ste(?)m used for reducing superheated steam temperature and this HRSG flue gas resistance as well as their regular patterns along with gas turbine exhaust gas temperature variation.更多还原