本文選題：煙塔合一　切入點：三塔合一　出處：《華北電力大學》2017年碩士論文

【摘要】：隨著煙塔合一技術的成熟應用,在其基礎上出現(xiàn)了三塔合一技術,即將脫硫塔內置于空冷塔內,由煙塔合一改為三塔合一。三塔合一技術具有節(jié)能降耗和減輕環(huán)境污染效益。在節(jié)能減排的形式下,三塔合一技術將在火電行業(yè)得到廣泛應用。三塔合一結構中排煙在塔內與熱氣體之間的混合和熱交換以及塔內布置的脫硫塔和煙囪會影響塔內氣體流動,使流場更加復雜,換熱特性的影響因素更加復雜。散熱器的布置方式、塔內排放的高溫高速煙氣、脫硫塔、煙囪以及塔型參數(shù)等因素均不同程度地影響換熱特性。全面的研究分析各個因素對換熱特性的影響規(guī)律,并探究出各個因素影響下的最優(yōu)換熱特性,為三塔合一結構的優(yōu)化運行提供參考。以某600MW三塔合一間接空冷機組為研究對象,首先建立三維數(shù)值計算模型,并利用相應的實測數(shù)據(jù)驗證了所建立數(shù)值模型的正確性。其次以此模型為基礎,對比研究了不同環(huán)境風速下散熱器塔外垂直布置和塔內水平布置時三塔合一間接空冷塔和常規(guī)間接空冷塔的流場和換熱特性的差異,以及散熱器布置方式對三塔合一間接空冷塔的換熱特性的影響。最后分別以三塔合一間接空冷塔的塔內排煙參數(shù)、脫硫塔和煙囪的結構參數(shù)以及空冷塔的塔型參數(shù)為單一變量,對不同變量取值的模型進行模擬計算,選取適當?shù)脑u價指標,探究各個變量對換熱特性的影響規(guī)律及影響程度。研究結果表明:無環(huán)境風工況下,每一種散熱器布置方式的兩種結構的換熱特性差異不大;存在環(huán)境風時,隨著環(huán)境風速的增大,每一種散熱器布置方式的兩種結構的換熱特性差異逐漸變大;在整個模擬的環(huán)境風速范圍內,三塔合一間接空冷塔的換熱特性始終好于常規(guī)間接空冷塔的換熱特性,散熱器塔外垂直布置時的換熱特性好于塔內水平布置時的換熱特性。排煙溫度、排煙速度、排煙流量、煙囪高度和煙囪直徑等參數(shù)的改變對換熱特性的影響并不大;隨著脫硫塔直徑的變大,換熱特性繼續(xù)減弱;隨著出口直徑或喉部直徑的變大,換熱特性先增強再減弱;無環(huán)境風工況下,隨著喉部高度的變大,換熱特性先增強再減弱,而有環(huán)境風時變化與之相反;隨著塔高度的變大,換熱特性持續(xù)增強;當出口直徑與零米直徑的比值R1/R2=0.8~0.85,喉部直徑與零米直徑的比值R0/R2=0.6~0.65時,換熱特性最優(yōu)。
[Abstract]:With the mature application of one tower, on the basis of the three in one technology, will be built in the desulfurization tower of air cooling tower, the smoke tower one to three one. Three in one technology with energy saving and reducing environmental pollution benefits. Energy saving and emission reduction in the form of a three. Technology will be widely used in thermal power industry. Three combined structure between the exhaust tower and hot gas mixing and heat exchange and internal layout of the desulfurization tower and chimney tower will affect the gas flow, the flow field is more complex, factors affecting the heat transfer characteristics are more complicated. The layout of the radiator, high temperature flue gas. The emission of the desulfurization tower, chimney and tower type parameters and other factors have different degrees of influence on heat transfer characteristics. Influence of comprehensive study on the thermal characteristics analysis of various factors on the exchange, and explore the various factors under the influence of the Excellent heat transfer characteristics, provide a reference for the optimization operation of a tower structure. With a 600MW three one indirect air-cooled unit as the research object, firstly established the three-dimensional numerical calculation model, and the corresponding measured data to verify the correctness of the numerical model. Then this model as the foundation, comparative study of different the wind speed difference flow radiator outside tower vertical layout and layout of three tower level one indirect air cooling tower and conventional indirect air cooling tower and heat transfer, and radiator arrangement on the tower one indirect air cooling tower heat transfer effect. Finally, three one indirect air cooling tower the exhaust tower parameters, structure parameters of the desulphurization tower and chimney type air cooling tower and tower parameters for a single variable, the different variable model simulation, selecting appropriate evaluation indexes, to explore the variable The influence and impact on the amount of thermal characteristics. The results show that under the condition of no wind, there was a slight difference between the heat transfer characteristics of two kinds of structure of each radiator arrangement; environmental wind, with the increase of wind speed, heat transfer characteristics between two kinds of structure of each radiator. Gradually increased; in the environment of the whole simulation range of wind speed, the heat transfer characteristics of the heat transfer characteristics of three in one indirect air cooling tower is always better than the conventional indirect air cooling tower, the heat transfer characteristics of radiator outside tower vertical arrangement of heat transfer characteristics in horizontal tower. When the exhaust gas temperature and exhaust velocity. The smoke flow, influence of thermal properties change on the chimney height and diameter of the chimney and other parameters are not; with the desulfurization tower diameter becomes larger, the heat transfer characteristics as exports continue to weaken; the diameter or throat diameter becomes larger, the heat transfer characteristics of first increasing and then Weakened; no environmental air condition, with the throat height increases, the heat transfer characteristics of first increased and then decreased, and the environmental wind changes the opposite; with the tower height increases, the heat transfer characteristics continue to increase; when the ratio of R1/R2=0.8~0.85 and zero exit diameter meter diameter, throat diameter and the ratio of R0/R2=0.6~0.65 zero meters in diameter, the optimal heat transfer characteristics.

【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM621

【參考文獻】

相關期刊論文 前10條

1 周二奇;陳龍;侯艷峰;;660MW機組四合一式空冷塔變工況運行的數(shù)值模擬[J];電站輔機;2016年02期

2 周二奇;陳龍;郝穎;侯艷峰;張娜;趙曉莉;李紅莉;李金海;;四塔合一式間接空冷塔傳熱性能的數(shù)值研究[J];電力科學與工程;2016年01期

3 席新銘;王夢潔;杜小澤;楊立軍;楊勇平;;“三塔合一”間接空冷塔內空氣流場分布特性[J];中國電機工程學報;2015年23期

4 蔣曉鋒;馬欣敏;朱一飛;劉明勇;黃雋佳;;間接空冷三塔合一的數(shù)值模擬[J];汽輪機技術;2015年02期

5 馬歡;司風琪;李嵐;�？灯�;閻文生;;間接空冷系統(tǒng)變工況快速計算模型[J];東南大學學報(自然科學版);2015年01期

6 莫浩浩;任少君;司風琪;徐治皋;;600MW三塔合一間接空冷機組的技術優(yōu)勢分析[J];電站系統(tǒng)工程;2015年01期

7 田志葉;;660 MW級燃煤電廠“三塔合一”技術簡析[J];華電技術;2014年07期

8 周蘭欣;馬少帥;弓學敏;孫會亮;;AP1000核電機組巨型冷卻塔型體優(yōu)化數(shù)值計算[J];動力工程學報;2012年12期

9 蔣華;馮t，

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