發(fā)布時(shí)間：2018-03-04 23:24

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

【摘要】：在當(dāng)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?xì)?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(guān)注和發(fā)展。聯(lián)合循環(huán)由燃?xì)廨啓C(jī)頂循環(huán)和余熱鍋爐與蒸汽輪機(jī)共同構(gòu)成的底循環(huán)組成,針對已定燃?xì)廨啓C(jī)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(jī)的燃?xì)?蒸汽聯(lián)合循環(huán)系統(tǒng)設(shè)計(jì)平臺開發(fā)”項(xiàng)目的重要組成部分。根據(jù)某型燃機(jī)的設(shè)計(jì)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(xué)第一定律,以底循環(huán)功率Pst最高為目標(biāo)函數(shù),對五種流程蒸汽參數(shù)進(jìn)行了詳細(xì)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(jié)果的基礎(chǔ)上,增加約束條件,得到系統(tǒng)綜合分析下的設(shè)計(jì)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(jié)果作為設(shè)計(jì)條件,建立底循環(huán)系統(tǒng)流程的變工況計(jì)算模型,開展了底循環(huán)流程各節(jié)點(diǎn)參數(shù)的變工況趨勢分析。結(jié)果發(fā)現(xiàn),隨著燃機(jī)功率的下降,高壓、低壓省煤器接近點(diǎn)溫差降低,出現(xiàn)了零和負(fù)值,造成了省煤器出口水的汽化。針對低負(fù)荷時(shí)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(shè)計(jì)底循環(huán)節(jié)點(diǎn)溫差和接近點(diǎn)溫差,以及改進(jìn)底循環(huán)流程結(jié)構(gòu),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?xì)?蒸汽聯(lián)合循環(huán)系統(tǒng)設(shè)計(jì)工況和變工況的研究成果為底循環(huán)系統(tǒng)設(shè)計(jì)和參數(shù)匹配提供了有意義的指導(dǎo)。
[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(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM611.31

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 蔡睿賢;余熱鍋爐節(jié)點(diǎn)溫差及其對聯(lián)合循環(huán)性能的影響[J];工程熱物理學(xué)報(bào);1983年03期

2 伍美貞，周會芳;燃?xì)猓羝?lián)合循環(huán)變工況計(jì)算及汽輪機(jī)的滑參數(shù)運(yùn)行[J];燃?xì)廨啓C(jī)技術(shù);1994年04期

相關(guān)碩士學(xué)位論文 前1條

1 陳戈伐;M701F型燃?xì)狻羝?lián)合循環(huán)機(jī)組變工況熱力性能分析[D];華南理工大學(xué);2013年

，

本文編號：1567776