發(fā)布時(shí)間：2018-05-25 15:29

  本文選題：淋水填料 + 熱質(zhì)交換　； 參考：《東華大學(xué)》2014年碩士論文

【摘要】：隨著人們節(jié)能環(huán)保意識(shí)的提升,如何提高冷卻塔的工作效率越來越受到人們的關(guān)注。淋水填料作為開式冷卻塔的核心部件,其熱工及阻力性能直接影響著冷卻塔的運(yùn)行效率。而如今淋水填料的種類和片材結(jié)構(gòu)層出不窮,但對(duì)其熱工性能的測(cè)量往往都采用露天測(cè)試,氣象參數(shù)并不穩(wěn)定,而且測(cè)試不將填料段單獨(dú)區(qū)分開來測(cè)量,測(cè)量數(shù)據(jù)和經(jīng)驗(yàn)公式在實(shí)際工程中的選用會(huì)形成較大的誤差。很多填料結(jié)構(gòu)的改進(jìn)優(yōu)化沒有實(shí)驗(yàn)數(shù)據(jù)的支撐,性能提高率常常是未知的。 基于這樣的背景,本文專門搭建逆流塔淋水填料測(cè)試平臺(tái),規(guī)范測(cè)試技術(shù),對(duì)片距不同及結(jié)構(gòu)改進(jìn)前后的淋水填料,以及不同波形的填料進(jìn)行熱工性能測(cè)量和分析。 首先本文系統(tǒng)地分析了逆流冷卻塔淋水填料層的熱質(zhì)交換,參考相關(guān)文獻(xiàn),利用麥克爾方程和辛普遜積分法,建立了填料層內(nèi)的熱、質(zhì)交換數(shù)學(xué)模型。隨后通過Matlab編譯了計(jì)算程序,通過輸入原始工況參數(shù),可以計(jì)算出淋水填料層噴淋水出口的水溫,以及填料的冷卻效率。此數(shù)學(xué)模型在之后通過實(shí)驗(yàn)進(jìn)行驗(yàn)證,得到填料出口噴淋水計(jì)算溫度與實(shí)測(cè)值的最大誤差在0.75%,冷卻效率模擬計(jì)算值與實(shí)測(cè)計(jì)算值最大誤差在7.7%,該誤差在工程允許范圍內(nèi)。 本文對(duì)四種高度為600mm的斜交錯(cuò)塑料淋水填料進(jìn)行性能測(cè)試,填料規(guī)格分別是傳統(tǒng)粘接片距15mm和片距12mm斜交錯(cuò)填料,以及優(yōu)化改進(jìn)為嵌入點(diǎn)粘接片距為12mm和19mm斜交錯(cuò)填料。實(shí)驗(yàn)結(jié)果表明嵌入點(diǎn)粘接能對(duì)填料性能起到較大的優(yōu)化。淋水密度在6-10m3/(m2·h),填料迎風(fēng)速度在1～-2.6m/s時(shí),嵌入點(diǎn)粘接片距為12mm斜交錯(cuò)填料阻力值是傳統(tǒng)粘接片距12mm斜交錯(cuò)填料阻力的93.2%～98.14%,氣水比在0.6-1.2之間,特性數(shù)依次提高約22.0%～29.2%。此外,嵌入點(diǎn)粘接的淋水填料,減小片距能很大程度地提高其冷卻性。傳統(tǒng)粘接小片距12mmm斜交錯(cuò)填料阻力比片距15mm填料大,但冷卻性能提高率并不理想。嵌入點(diǎn)粘接片距為12mmm的填料比19mmm阻力略大,但在常用氣水比范圍內(nèi),其冷卻數(shù)比片距19mmm填料提高了約45%～53%。 本文另外對(duì)S波型,人字波型以及復(fù)合波型,高1000mm的三種工業(yè)用中高溫填料進(jìn)行測(cè)試。測(cè)試結(jié)果顯示：S波型填料阻力最大,其次是人字波,復(fù)合波型填料通風(fēng)阻力最小。淋水密度在6-10m3/(m2·h),在常用氣水比范圍內(nèi),復(fù)合波型填料冷卻數(shù)是人字波型的1.08-1.34倍,是S波型的1.06～1.1倍。 最后,本文以20t/h方形逆流塔為實(shí)際工程案例,分析選用之前實(shí)驗(yàn)測(cè)試的四種斜交錯(cuò)淋水填料,得到四種填料在該工程中合理的氣水比。與此同時(shí),計(jì)算它們?cè)诟髯宰詈侠淼倪\(yùn)行工況下填料層的空氣阻力,結(jié)果顯示嵌入點(diǎn)粘接片距12mmm填料層的阻力最小,為14.76Pa；傳統(tǒng)粘接片距15mm填料的阻力最大,為24.93Pa。最后對(duì)整個(gè)冷卻塔進(jìn)行運(yùn)行分析,得出選用嵌入點(diǎn)粘接的大片距19mmm斜交錯(cuò)填料的冷卻塔風(fēng)機(jī)電機(jī)功率最大,為1.1kw；選用嵌入點(diǎn)粘接的小片距12mmm斜交錯(cuò)淋填料的冷卻塔風(fēng)機(jī)電機(jī)功率最小,僅為0.37kw。
[Abstract]:With the improvement of people ' s energy - saving and environmental protection consciousness , how to improve the working efficiency of cooling tower has been paid more and more attention .

Based on this background , this paper specially sets up the test platform of counter - current tower , the specification and test technology , the water - sprinkling filling before and after the structure improvement , and the thermal performance measurement and analysis of different wave - shaped fillers .

In this paper , a mathematical model of heat and mass exchange in the packing layer is established by using the Maxwell equation and the Simpson integral method . The water temperature of the spray water outlet and the cooling efficiency of the packing are calculated by Matlab . The maximum error of the spray water at the outlet of the packing is 0.75 % , and the maximum error of the cooling efficiency is 7.7 % . The error is within the allowable range of the project .

The experimental results show that the adhesive sheet has a better cooling performance than that of the conventional adhesive sheet with a distance of 6 - 10m3 / ( m2 路 h ) , and the air - water ratio is between 0.6 and 1.2 % .

The results show that the resistance of S - wave type packing is the biggest , the second is the herringbone wave , and the ventilation resistance of the composite wave - type packing is the least . The density of the composite wave - type packing is 1 . 08 - 1 . 34 times of that of the herringbone wave , and it is 1.06 - 1.1 times of the S - wave type .

Finally , this paper takes 20t / h square counter - flow tower as the practical engineering case , and analyzes the four kinds of oblique cross - staggered water - pouring fillers which are used in the previous experiment to obtain the reasonable gas - water ratio of the four kinds of fillers in the project . At the same time , the air resistance of the packing layer under the most reasonable operating conditions is calculated , and the result shows that the resistance of the embedded - point adhesive sheet to the filler layer of 12 mm is minimum , which is 14.76Pa ;
The maximum resistance of the traditional adhesive sheet to 15mm packing is 24.93Pa . Finally , the whole cooling tower is run and analyzed , and it is concluded that the maximum power of the fan motor is 1.1 kw .
The minimum power of the fan motor of cooling tower with the small sheet spacing of 12 mm from the embedding point is only 0.37 kw .
【學(xué)位授予單位】：東華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TB657;TU831

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本文編號(hào)：1933732