本文關(guān)鍵詞：大型燃煤鍋爐低溫?zé)煔庥酂峋C合利用及節(jié)能分析　出處：《華北電力大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 電站鍋爐 煙氣余熱利用 低溫省煤器 節(jié)能分析 設(shè)計改造

【摘要】：隨著最近幾年,燃煤價格的不斷攀升以及國內(nèi)節(jié)能減排要求的日益嚴(yán)格,提高燃煤電站全廠熱效率、減少機(jī)組煤耗、同時降低對周圍環(huán)境的污染成為我國發(fā)展煤電的重點(diǎn)�，F(xiàn)階段,對鍋爐低溫?zé)煔饧右曰厥绽脽o疑是一項(xiàng)重要節(jié)能措施。本文首先從煙氣余熱資源合理優(yōu)化配置的角度,在充分考慮預(yù)防煙氣低溫腐蝕問題的基礎(chǔ)上,結(jié)合相應(yīng)熱力學(xué)分析方法與建模理論,構(gòu)建了燃煤電站低溫?zé)煔庥酂峄厥障到y(tǒng)所涉及主要換熱單元及流程的合理化數(shù)學(xué)模型,為進(jìn)一步分析回收煙氣低品位能時的優(yōu)化設(shè)計和改造方案奠定了良好的理論基礎(chǔ)。在此基礎(chǔ)上,論文對上海某典型1000MW燃煤機(jī)組開展深入分析,根據(jù)其實(shí)際運(yùn)行情況,在煙氣余熱回收裝置的煙氣側(cè)連接方式、水側(cè)連接方式、管徑、管材的優(yōu)選等方面提出了幾種較為合理可行的方案,并最終確定一套優(yōu)選改造方案,即利用回?zé)嵯到y(tǒng)中的凝結(jié)水來回收排煙余熱的方案。最后,論文應(yīng)用所建模型,對該典型1000MW燃煤機(jī)組的改造方案進(jìn)行了全面的熱力學(xué)分析,并對低溫余熱回收方案的節(jié)煤收益、節(jié)水效果以及該電站加裝兩級低溫省煤器后對尾部煙道帶來的影響進(jìn)行了深入分析。此外,論文也對該機(jī)組進(jìn)行低溫?zé)煔庥酂峄厥崭脑斓耐顿Y成本及變工況運(yùn)行情況進(jìn)行了綜合分析。本文研究將熱力學(xué)理論應(yīng)用于解決燃煤電站鍋爐余熱利用的工程實(shí)際問題,并對典型電站改造方案進(jìn)行了深入分析,研究結(jié)果豐富了余熱綜合利用領(lǐng)域的分析方法與優(yōu)化思路,對已投產(chǎn)機(jī)組的節(jié)能優(yōu)化改造有一定的參考意義。
[Abstract]:With the rising price of coal and the increasingly strict requirements of energy saving and emission reduction in recent years, the thermal efficiency of the whole plant of coal-fired power station is improved, and the coal consumption of the unit is reduced. At the same time, reducing the pollution of the surrounding environment has become the focus of coal power development in China. The recovery and utilization of boiler low-temperature flue gas is undoubtedly an important energy-saving measure. Firstly, from the point of view of rational allocation of flue gas waste heat resources, this paper takes full account of the prevention of low-temperature corrosion of flue gas. Combined with the corresponding thermodynamic analysis method and modeling theory, the rational mathematical model of the main heat transfer units and processes involved in the waste heat recovery system of low-temperature flue gas from coal-fired power station is constructed. It lays a good theoretical foundation for further analysis of optimal design and retrofit scheme for recovering low-grade energy from flue gas. On this basis, the paper carries out in-depth analysis of a typical 1000MW coal-fired unit in Shanghai. According to its actual operation, several reasonable and feasible schemes are put forward in the aspects of flue gas side connection mode, water side connection mode, pipe diameter, pipe material optimization and so on. And finally determine a set of optimal selection and transformation plan, that is, using condensate in the regenerative system to recover exhaust heat. Finally, the paper applies the established model. A comprehensive thermodynamic analysis of the retrofit scheme of the typical 1000MW coal-fired unit is carried out, and the coal-saving benefits of the low-temperature waste heat recovery scheme are also discussed. The effect of saving water and the influence of installing two stage low temperature economizer on the tail flue of the power station are analyzed. The paper also analyses the investment cost and operation condition of the unit for recovering waste heat from low temperature flue gas. The thermodynamic theory is applied to solve the engineering practice of waste heat utilization of coal-fired power plant boiler in this paper. The problem. The research results enrich the analysis methods and optimization ideas in the field of comprehensive utilization of waste heat, and have a certain reference significance for the energy-saving optimization of units put into operation.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM621.2;TK115

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