【摘要】：與濕冷機(jī)組相比,空冷機(jī)組最大的優(yōu)勢(shì)就是節(jié)水,但其背壓較高,機(jī)組循環(huán)熱效率較低,因此有必要結(jié)合空冷的運(yùn)行特點(diǎn),尋求進(jìn)一步提高機(jī)組熱經(jīng)濟(jì)性的途徑。在空冷機(jī)組中,鍋爐排煙熱損失和汽輪機(jī)冷端熱損失同時(shí)存在且數(shù)量巨大,合理利用這兩種余熱資源,對(duì)提高機(jī)組效率、降低供電煤耗具有重要意義。 對(duì)于鍋爐排煙熱余熱的利用,最常用的方法就是在空氣預(yù)熱器之后加設(shè)低溫省煤器。本文就低溫省煤器系統(tǒng)的節(jié)能原理和約束條件做了詳細(xì)探討,并經(jīng)分析指出；低溫省煤器系統(tǒng)是最簡(jiǎn)單有效的煙氣余熱利用方法之一,也是汽輪機(jī)冷端余熱利用的實(shí)現(xiàn)基礎(chǔ)。結(jié)合某典型600MW空冷機(jī)組數(shù)據(jù),本文首先提出了基于低溫省煤器系統(tǒng)的空冷機(jī)組余熱綜合利用系統(tǒng),初步介紹了對(duì)空冷凝汽器熱空氣余熱的利用思路,并展開了相關(guān)熱力學(xué)和技術(shù)經(jīng)濟(jì)學(xué)分析；結(jié)合能量梯級(jí)利用理論,本文進(jìn)一步提出了空冷機(jī)組余熱高效利用系統(tǒng),并圍繞該系統(tǒng)進(jìn)行了深入的優(yōu)化設(shè)計(jì)。本文的研究成果對(duì)空冷機(jī)組熱余熱綜合利用系統(tǒng)的設(shè)計(jì)與優(yōu)化具有一定的參考意義。
[Abstract]:Compared with the wet cooling unit, the biggest advantage of the air cooling unit is water saving, but its back pressure is high and the unit cycle heat efficiency is low. Therefore, it is necessary to combine the operation characteristics of the air cooling unit to find ways to further improve the thermal economy of the unit. In the air-cooled unit, the heat loss of boiler exhaust gas and the cold end of steam turbine exist simultaneously and the quantity is huge. It is of great significance to use these two kinds of waste heat resources reasonably to improve the efficiency of the unit and reduce the coal consumption of power supply. For the utilization of waste heat of boiler exhaust heat, the most commonly used method is to install a low temperature economizer after the air preheater. In this paper, the energy saving principle and constraint conditions of low temperature economizer system are discussed in detail, and it is pointed out that the low temperature economizer system is one of the most simple and effective methods for the utilization of waste heat of flue gas, and it is also the basis of realizing the utilization of waste heat at the cold end of steam turbine. Based on the data of a typical 600MW air-cooled unit, this paper first puts forward a comprehensive utilization system of waste heat of air-cooled unit based on low-temperature economizer system, and introduces the idea of utilization of hot air waste heat of air-cooled condenser. The thermodynamics and technical economics analysis are also carried out. Combined with the theory of energy cascade utilization, this paper further puts forward the efficient utilization system of waste heat of air cooling unit, and carries on the thorough optimization design around the system. The research results of this paper have certain reference significance for the design and optimization of the comprehensive utilization system of heat waste heat of air cooling unit.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM621.4

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