本文選題：底循環(huán)系統(tǒng)　切入點：集成匹配　出處：《大連理工大學》2015年碩士論文　論文類型：學位論文

【摘要】：在當今世界尋求能量的高效利用、環(huán)境的友好相處大格局下,燃氣-蒸汽聯(lián)合循環(huán)以其高效率、低排放的優(yōu)良特性受到越來越多的關注和發(fā)展。聯(lián)合循環(huán)由燃氣輪機頂循環(huán)和余熱鍋爐與蒸汽輪機共同構成的底循環(huán)組成,針對已定燃氣輪機的聯(lián)合循環(huán),底循環(huán)系統(tǒng)的集成匹配及其變工況研究具有重要意義。本文研究內(nèi)容是“基于某重型燃機的燃氣-蒸汽聯(lián)合循環(huán)系統(tǒng)設計平臺開發(fā)”項目的重要組成部分。根據(jù)某型燃機的設計工況排氣參數(shù),建立了單壓、雙壓無再熱、雙壓再熱、三壓無再熱、三壓再熱五種底循環(huán)系統(tǒng)流程模型�；跓崃W第一定律,以底循環(huán)功率Pst最高為目標函數(shù),對五種流程蒸汽參數(shù)進行了詳細的匹配研究,得出了蒸汽壓力的匹配規(guī)律。在最優(yōu)匹配結果的基礎上,增加約束條件,得到系統(tǒng)綜合分析下的設計參數(shù)。并比較討論了五種流程綜合分析下的循環(huán)性能特性。最后,以三壓無再熱底循環(huán)參數(shù)匹配結果作為設計條件,建立底循環(huán)系統(tǒng)流程的變工況計算模型,開展了底循環(huán)流程各節(jié)點參數(shù)的變工況趨勢分析。結果發(fā)現(xiàn),隨著燃機功率的下降,高壓、低壓省煤器接近點溫差降低,出現(xiàn)了零和負值,造成了省煤器出口水的汽化。針對低負荷時省煤器出現(xiàn)的汽化現(xiàn)象提出了兩種解決方案,即重新設計底循環(huán)節(jié)點溫差和接近點溫差,以及改進底循環(huán)流程結構,分析了兩種方案對于聯(lián)合循環(huán)底循環(huán)性能的影響。本文針對燃氣-蒸汽聯(lián)合循環(huán)系統(tǒng)設計工況和變工況的研究成果為底循環(huán)系統(tǒng)設計和參數(shù)匹配提供了有意義的指導。
[Abstract]:In today's world, the gas-steam combined cycle is highly efficient in seeking the efficient use of energy and the friendly coexistence of the environment. The excellent characteristics of low emission have attracted more and more attention and development. The combined cycle is composed of the top cycle of gas turbine and the bottom cycle of waste heat boiler and steam turbine, aiming at the combined cycle of fixed gas turbine. It is of great significance to study the integrated matching of bottom cycle system and its variable working conditions. The research content of this paper is an important part of the project of "Development of Gas-steam combined cycle system Design platform based on a heavy Gas engine". Exhaust parameters of a certain type of gas turbine under design conditions, The flow models of single pressure, double pressure without reheat, double pressure reheat, three pressure reheat and three pressure reheat are established. Based on the first law of thermodynamics, the maximum bottom cycle power Pst is taken as the objective function. The matching law of steam pressure is obtained through the detailed matching of five kinds of steam parameters. On the basis of the optimal matching result, the constraint condition is added. The design parameters under the system comprehensive analysis are obtained, and the cycle performance characteristics of the five processes are compared and discussed. Finally, the matching results of three pressure and no reheat bottom cycle parameters are taken as the design conditions. The off-condition calculation model of bottom circulation system flow is established, and the variable working condition trend analysis of each node parameter of bottom circulation system is carried out. The results show that with the decrease of power of gas turbine, the temperature difference of approaching point of low pressure economizer decreases with the decrease of power of gas turbine. The zero and negative values have resulted in the vaporization of the outlet water of the economizer. Two solutions to the vaporization phenomenon of the economizer under low load are put forward, that is, redesigning the temperature difference of the bottom cycle node and the temperature difference of the close point. And to improve the bottom cycle flow structure, The effects of two schemes on the performance of the combined cycle bottom cycle are analyzed. The research results of the gas-steam combined cycle system design conditions and variable conditions provide a meaningful guidance for the bottom cycle system design and parameter matching.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM611.31

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本文編號：1567776