本文選題：330MW機(jī)組 + 鍋爐尾部煙氣溫度��； 參考：《華北電力大學(xué)》2017年碩士論文

【摘要】：低低溫省煤器技術(shù)是在現(xiàn)階段電站鍋爐尾部煙氣熱量回收、節(jié)能利用的一項(xiàng)技術(shù),針對(duì)當(dāng)前電廠鍋爐的排煙溫度過(guò)高的問(wèn)題,這項(xiàng)技術(shù)便成為近年來(lái)發(fā)電廠有效降低鍋爐排煙溫度的一項(xiàng)很實(shí)用的方法。本文在前人研究的基礎(chǔ)上,依據(jù)熱平衡原理建立低低溫省煤器優(yōu)化設(shè)計(jì)模型,利用計(jì)算機(jī)編程來(lái)計(jì)算、優(yōu)化,得到最優(yōu)的設(shè)備參數(shù)。通過(guò)分析比較,選取低低溫省煤器在煙氣側(cè)最優(yōu)的布置位置及在水側(cè)最優(yōu)的連接方式。結(jié)合實(shí)際發(fā)電廠的工程項(xiàng)目,依據(jù)等效焓降法及余熱利用理念,計(jì)算應(yīng)用低低溫省煤器后系統(tǒng)的熱經(jīng)濟(jì)性指標(biāo)。首先,考慮到低低溫省煤器處在低溫環(huán)境,經(jīng)過(guò)對(duì)耐腐蝕材料和管型傳熱性能的分析和比較,得到了合適的管材和管型。選取低低溫省煤器管相關(guān)參量作為決策變量,通過(guò)熱平衡理論進(jìn)行傳熱計(jì)算,設(shè)定相關(guān)約束條件,假設(shè)低低溫省煤器出口煙氣溫度為變量,建立低低溫省煤器的優(yōu)化設(shè)計(jì)模型,經(jīng)過(guò)程序計(jì)算和優(yōu)化后得出最優(yōu)結(jié)果。其次,結(jié)合達(dá)拉特發(fā)電廠330MW機(jī)組的實(shí)際工程,選取低低溫省煤器在鍋爐尾部最合理的布置方式。由煤種特性計(jì)算出煙氣露點(diǎn)溫度,控制低低溫省煤器入口凝結(jié)水的溫度,避免低溫腐蝕的影響。對(duì)其水側(cè)串并聯(lián)系統(tǒng)進(jìn)行熱力分析,選取最優(yōu)的串并聯(lián)方式。通過(guò)低低溫省煤器優(yōu)化設(shè)計(jì)和相關(guān)參量確定后,利用等效焓降法及余熱利用理念,分析加裝低低溫省煤器后的熱力系統(tǒng),計(jì)算標(biāo)準(zhǔn)煤耗量、煤耗率、機(jī)組熱效率等熱經(jīng)濟(jì)性指標(biāo)。
[Abstract]:Low and low temperature economizer technology is a technology for heat recovery and energy saving of flue gas from the tail of power plant boiler at the present stage. Aiming at the problem of excessive exhaust gas temperature of power plant boiler at present, This technique has become a practical method for reducing boiler exhaust gas temperature in power plants in recent years. In this paper, based on the previous research, the optimal design model of low temperature economizer is established according to the principle of heat balance, and the optimum equipment parameters are obtained by computer programming. Through analysis and comparison, the optimal arrangement position of low temperature economizer on the flue gas side and the optimal connection mode on the water side are selected. Based on the equivalent enthalpy drop method and the idea of waste heat utilization, the thermal economic indexes of the system after the application of low temperature economizer are calculated. Firstly, considering that the low temperature economizer is in the low temperature environment, through the analysis and comparison of the corrosion resistant material and the heat transfer performance of the tube type, the appropriate pipe and tube type are obtained. The parameters related to the tube of low temperature economizer are selected as decision variables. The heat transfer calculation is carried out through the theory of heat balance. The relevant constraint conditions are set up, and the optimal design model of low temperature economizer is established, assuming that the flue gas temperature at the outlet of low temperature economizer is a variable. The optimal results are obtained by program calculation and optimization. Secondly, combined with the practical project of 330MW unit in Dharat Power Plant, the most reasonable arrangement of low temperature economizer in boiler tail is selected. The dew point temperature of flue gas is calculated according to the characteristics of coal, and the temperature of condensate at the inlet of low temperature economizer is controlled to avoid the influence of low temperature corrosion. The thermodynamic analysis of the water side series-parallel system is carried out, and the optimal series-parallel mode is selected. After optimized design of low temperature economizer and determination of relevant parameters, the thermodynamic system after installing low temperature economizer is analyzed by using equivalent enthalpy drop method and waste heat utilization concept, and standard coal consumption and coal consumption rate are calculated. Unit thermal efficiency and other thermal economic indicators.
【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】：2017
【分類號(hào)】：TM621

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