【摘要】：隨著空冷技術(shù)的不斷發(fā)展,超臨界間接空冷機(jī)組在富煤缺水地區(qū)將得到廣泛應(yīng)用。針對(duì)間接空冷散熱器不同的翅片管束結(jié)構(gòu)型式,選取對(duì)應(yīng)的翅片管束流動(dòng)和傳熱關(guān)聯(lián)式,并考慮空冷塔各個(gè)環(huán)節(jié)的流動(dòng)阻力以及對(duì)應(yīng)不同散熱器壁溫的抽吸力計(jì)算公式,建立了能夠體現(xiàn)空冷塔流動(dòng)和傳熱性能的物理數(shù)學(xué)模型。針對(duì)給定塔形進(jìn)行了如下分析,在不同環(huán)境風(fēng)速下,由于空氣繞流空冷塔引起散熱器單元進(jìn)口空氣壓力分布變化,導(dǎo)致空冷塔散熱能力的改變,進(jìn)而對(duì)凝汽器背壓造成的影響。在環(huán)境氣溫變化時(shí),散熱器單元進(jìn)口空氣溫度發(fā)生變化,致使空冷塔散熱能力發(fā)生變化,對(duì)凝汽器背壓造成的影響。在機(jī)組負(fù)荷發(fā)生變化時(shí),由于冷卻水流量與溫度發(fā)生變化,使得空冷塔散熱能力發(fā)生變化,對(duì)凝汽器背壓造成的影響。 建立了電站間接空冷系統(tǒng)變工況特性數(shù)學(xué)模型,并給出計(jì)算的流程圖,應(yīng)用Matlab軟件編制了計(jì)算程序,為間接空冷機(jī)組變工況特性的分析奠定了理論基礎(chǔ)。以典型2×660MW間接空冷機(jī)組為例,分析了間接空冷機(jī)組背壓隨環(huán)境風(fēng)速、環(huán)境溫度、排氣流量、循環(huán)水流量的變化規(guī)律。為指導(dǎo)電站空冷系統(tǒng)運(yùn)行和設(shè)計(jì)提供了參考。
[Abstract]:With the continuous development of air cooling technology, supercritical indirect air cooling units will be widely used in areas rich in coal and water shortage. In view of the different finned tube bundle structure types of indirect air cooling radiator, the corresponding flow and heat transfer correlations of the fin tube bundle are selected, and the flow resistance of each link of the air cooling tower and the calculation formula of suction force corresponding to different radiator wall temperature are taken into account. A mathematical model of air cooling tower flow and heat transfer is established. The following analysis is made for the given tower shape. Under different ambient wind speeds, the air pressure distribution at the inlet of the radiator unit changes due to the air flow around the air cooling tower, which leads to the change of the cooling capacity of the air cooling tower and the effect on the back pressure of the condenser. When the ambient temperature changes, the inlet air temperature of the radiator unit changes, which results in the change of the cooling tower heat dissipation capacity and the influence on the back pressure of the condenser. When the unit load changes, the cooling water flow and temperature change, which results in the change of cooling tower heat dissipation capacity and the influence on the back pressure of condenser. The mathematical model of variable working condition characteristic of indirect air cooling system of power station is established, and the flow chart of calculation is given. The calculation program is compiled by using Matlab software, which lays a theoretical foundation for the analysis of variable working condition characteristic of indirect air cooling unit. Taking a typical 2 脳 660MW indirect air-cooled unit as an example, the variation of backpressure of indirect air-cooled unit with ambient wind speed, ambient temperature, exhaust flow rate and circulating water flow rate is analyzed. It provides a reference for the operation and design of air cooling system in power station.
【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

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