本文選題：雙曲型空冷單元 + 圓臺(tái)型空冷單元　； 參考：《華北電力大學(xué)》2016年碩士論文

【摘要】：直接空冷技術(shù)在如今富煤貧水的內(nèi)陸廣大地區(qū)已應(yīng)用越來(lái)越多,空冷帶給人們的好處是巨大的,但是空冷凝汽器換熱的缺陷也隨之越來(lái)越明顯。直接空冷單元的“Λ”形結(jié)構(gòu)是廣泛被人們贊同的,同時(shí)也是空冷單元內(nèi)部流場(chǎng)溫度場(chǎng)分布不均的主要原因。為了解決這些問(wèn)題,使其更經(jīng)濟(jì)安全,前人做了許多努力。本課題致力于推陳出新,突破局限,提出新的空冷凝汽器單元結(jié)構(gòu),并對(duì)其傳熱特性進(jìn)行研究,這對(duì)改進(jìn)傳統(tǒng)直接空冷技術(shù)具有重要的現(xiàn)實(shí)意義。本文以改進(jìn)現(xiàn)有直接空冷凝汽器單元典型結(jié)構(gòu)中所存在的問(wèn)題為目的,首先,以龍山電廠600MW機(jī)組的模型為比較對(duì)象,模擬了兩種我們自己提出的新型空冷單元的流動(dòng)和傳熱情況,又在雙曲型空冷單元頂部加裝擋板和半翅片擋板,并對(duì)擋板孔隙率對(duì)雙曲型空冷單元換熱的影響進(jìn)行了模擬分析,得到最佳雙曲型空冷單元的形式;其次,在考慮雙曲型空冷單元制作安裝和換熱面積的基礎(chǔ)上對(duì)其進(jìn)行改進(jìn),將雙曲換熱面改成圓臺(tái)面的形式,對(duì)圓臺(tái)型空冷單元的流動(dòng)傳熱特性與頂部孔隙率的關(guān)系進(jìn)行了探討,得出有利換熱和安全使用的最佳孔隙率;再次,又討論了遮風(fēng)板對(duì)圓臺(tái)型空冷單元的換熱的影響,對(duì)遮風(fēng)板的形式進(jìn)行了優(yōu)化;最后,將以上各種形式的空冷單元在不同的入口風(fēng)速和環(huán)境溫度下進(jìn)行比較,得到最有利于換熱、并且適宜長(zhǎng)久安全使用的新型直接空冷單元形式;這些都為傳統(tǒng)直接空冷技術(shù)的改進(jìn)提供了重要的理論依據(jù)。
[Abstract]:Direct air cooling technology has been used more and more in the inland areas with rich coal and poor water. The benefits of air cooling are great, but the defects of air cooling condenser heat transfer are becoming more and more obvious. The "A" shape structure of the direct air-cooled element is widely accepted by people, and it is also the main reason for the uneven distribution of the flow field temperature field in the air-cooled unit. In order to solve these problems and make them more economical and safe, the predecessors have made a lot of efforts. This paper is devoted to bring forth new ideas and break through the limitation, and put forward a new unit structure of air-cooled condenser and study its heat transfer characteristics, which is of great practical significance to improve the traditional direct air-cooling technology. This paper aims at improving the existing problems in the typical structure of direct air-cooled condenser units. Firstly, the model of 600MW units in Longshan Power Plant is taken as a comparison object. The flow and heat transfer of two new air cooling units proposed by us are simulated, and the baffles and half fin baffles are added to the top of the hyperbolic air cooling units. The effect of the porosity of the baffles on the heat transfer of the hyperbolic air cooling units is simulated and analyzed. The optimal form of hyperbolic air cooling unit is obtained. Secondly, the hyperbolic heat transfer surface is changed into a round table surface based on the consideration of the fabrication, installation and heat transfer area of the hyperbolic air cooling unit. The relationship between the flow heat transfer characteristics and the top porosity of the round type air cooling unit is discussed, and the optimum porosity favorable for heat transfer and safe use is obtained. Thirdly, the effect of the shielding plate on the heat transfer of the round platform type air cooling unit is also discussed. The form of the baffle is optimized. Finally, the air cooling units mentioned above are compared at different inlet wind speeds and ambient temperatures, and the results show that the air cooling units are most favorable for heat transfer. And a new type of direct air cooling unit is suitable for long-term safe use, which provides an important theoretical basis for the improvement of traditional direct air cooling technology.
【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】：2016
【分類號(hào)】：TM621;TK124

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本文編號(hào)：1876264