【摘要】：我國(guó)執(zhí)行改革開放政策以來(lái),優(yōu)先發(fā)展能源產(chǎn)業(yè)成為一項(xiàng)長(zhǎng)期的戰(zhàn)略任務(wù)。由于燃?xì)廨啓C(jī)的單機(jī)功率和熱效率都有明顯的提升,特別是燃?xì)狻羝?lián)合循環(huán)技術(shù)逐漸趨于成熟,燃?xì)廨啓C(jī)及其聯(lián)合循環(huán)機(jī)組在世界電力系統(tǒng)中的地位發(fā)生了顯著變化。聯(lián)合循環(huán)機(jī)組有利于節(jié)省日趨緊張的能源儲(chǔ)備,符合可持續(xù)發(fā)展的戰(zhàn)略。增加燃?xì)狻羝?lián)合循環(huán)的研究投入,實(shí)現(xiàn)系統(tǒng)的高效運(yùn)行顯得尤為重要。本文針對(duì)國(guó)產(chǎn)某型燃?xì)廨啓C(jī)展開研究,基于該燃?xì)廨啓C(jī)排氣參數(shù)為其匹配了合理的蒸汽底循環(huán)系統(tǒng)流程結(jié)構(gòu),主要工作著眼于蒸汽底循環(huán)系統(tǒng)變工況性能參數(shù)的精確求解以及基于熱力學(xué)定律的底循環(huán)系統(tǒng)優(yōu)化分析。首先介紹了國(guó)內(nèi)外對(duì)于聯(lián)合循環(huán)系統(tǒng)變工況研究以及參數(shù)優(yōu)化的研究現(xiàn)狀,分析了燃?xì)狻羝?lián)合循環(huán)蒸汽底循環(huán)系統(tǒng)變工況性能計(jì)算及優(yōu)化設(shè)計(jì)的意義。借助Fortran語(yǔ)言實(shí)現(xiàn)對(duì)底循環(huán)系統(tǒng)變工況求解,并進(jìn)行了五種(單壓、雙壓、雙壓再熱、三壓、三壓再熱)不同底循環(huán)系統(tǒng)的變工況性能計(jì)算,通過(guò)與美國(guó)GE公司的GateCycle軟件比較,驗(yàn)證了計(jì)算的準(zhǔn)確性和應(yīng)用價(jià)值。在此基礎(chǔ)上,以雙壓無(wú)再熱系統(tǒng)為例從熱力學(xué)第一定律出發(fā),分析蒸汽參數(shù)對(duì)底循環(huán)系統(tǒng)性能的影響,充分考慮底循環(huán)系統(tǒng)在運(yùn)行中應(yīng)注意的限制條件,以底循環(huán)效率最大為目標(biāo)函數(shù)進(jìn)行多參數(shù)的綜合優(yōu)化,優(yōu)化后蒸汽底循環(huán)熱效率相比于之前提升1.36%。同時(shí),從不同角度出發(fā)給出描述余熱鍋爐炯效率的不同目標(biāo)函數(shù),并分析不同目標(biāo)函數(shù)下得到不同優(yōu)化結(jié)果的原因。選擇合適的目標(biāo)函數(shù)來(lái)描述系統(tǒng)性能,通過(guò)該型燃?xì)廨啓C(jī)與其他兩種不同型號(hào)燃機(jī)的比較,分析不同燃?xì)廨啓C(jī)排氣參數(shù)對(duì)底循環(huán)性能優(yōu)化結(jié)果的影響,為燃機(jī)的改進(jìn)和設(shè)計(jì)提供參考。
[Abstract]:Since the implementation of the reform and opening policy, it has become a long-term strategic task to give priority to the development of energy industry. Because the single engine power and thermal efficiency of gas turbine have been improved obviously, especially the gas-steam combined cycle technology has gradually matured, the status of gas turbine and its combined cycle unit has changed significantly in the world power system. Combined cycle units are conducive to saving energy reserves, which are in line with the strategy of sustainable development. It is very important to increase the research investment of gas-steam combined cycle and realize the efficient operation of the system. In this paper, a domestic gas turbine is studied. Based on the exhaust parameters of the turbine, a reasonable flow structure of the steam bottom circulating system is matched. The main work is focused on the accurate solution of the performance parameters of the steam bottom cycle system and the optimization analysis of the bottom cycle system based on the thermodynamic law. This paper first introduces the research status of off-condition research and parameter optimization of combined cycle system at home and abroad, and analyzes the significance of off-condition performance calculation and optimization design of gas-steam combined cycle steam bottom cycle system. With the help of Fortran language, the off-condition solution of bottom cycle system is realized, and the performance calculation of five different bottom cycle systems (single pressure, double pressure reheat, three pressure reheat) is carried out. The results are compared with the GateCycle software of GE Company of the United States. The accuracy and application value of the calculation are verified. On this basis, taking the double pressure non-reheat system as an example, the influence of steam parameters on the performance of bottom circulation system is analyzed according to the first law of thermodynamics, and the limiting conditions that should be paid attention to in the operation of bottom circulation system are fully considered. Taking the maximum bottom cycle efficiency as the objective function, the multi-parameter comprehensive optimization is carried out. The heat efficiency of steam bottom cycle after optimization is 1.36% higher than that before. At the same time, different objective functions are given to describe the efficiency of waste heat boiler from different angles, and the reasons for obtaining different optimization results under different objective functions are analyzed. A suitable objective function is chosen to describe the performance of the system. By comparing this type of gas turbine with other two different types of gas turbine, the influence of exhaust parameters of different gas turbine on the optimization results of bottom cycle performance is analyzed. To provide reference for the improvement and design of gas turbine.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TK471

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本文編號(hào)：2217203