本文選題：數(shù)值模擬 + 熱風(fēng)吹掃系統(tǒng)��； 參考：《昆明理工大學(xué)》2017年碩士論文

【摘要】：近年來,空氣污染十分嚴(yán)重,國家十分重視空氣污染的治理。電除塵器作為一種重要的環(huán)保設(shè)備,在改善空氣質(zhì)量方面,發(fā)揮了十分重要的作用。由于煙氣露點(diǎn)高、腐蝕性強(qiáng),易在絕緣件表面結(jié)露,導(dǎo)致絕緣件經(jīng)常性損壞,影響生產(chǎn)的正常進(jìn)行,傳統(tǒng)的做法是,在絕緣件周邊安裝電加熱管,由于電加熱管與絕緣件太近,熱傳導(dǎo)、熱輻射使得瓷件上下溫差過大,熱膨脹產(chǎn)生的應(yīng)力易使絕緣件炸裂,縮短了絕緣件的使用壽命,需要頻繁地更換絕緣件,給工業(yè)生產(chǎn)造成嚴(yán)重的經(jīng)濟(jì)損失。為解決絕緣件頻繁損壞的問題,本文針對采用熱風(fēng)吹掃系統(tǒng)的絕緣子室進(jìn)行數(shù)值模擬,并且設(shè)置了 A、B、C三種方案。與方案A不同的是,方案B在承壓絕緣子上蓋板上開設(shè)了一定數(shù)量的小孔。方案C是為了探究通洞對絕緣子室內(nèi)的溫度場和速度場的影響而設(shè)的,首先,在SolidWorks中建立幾何模型,然后將其導(dǎo)入到ICEMCFD中,對其進(jìn)行網(wǎng)格劃分及邊界條件確定,接著運(yùn)用ANSYS FLUENT對絕緣子室內(nèi)的溫度和速度分布情況進(jìn)行數(shù)值計(jì)算,將計(jì)算結(jié)果導(dǎo)入到Tecplot 360進(jìn)行處理,得到氣流的溫度場和速度場。通過方案A和方案B的對比分析可知,熱風(fēng)吹掃系統(tǒng)并不能使所有的振打部件內(nèi)部及附近區(qū)域的溫度高于露點(diǎn)溫度,在靠近進(jìn)口、出口附近區(qū)域的振打部件周圍易出現(xiàn)溫度低于露點(diǎn)的現(xiàn)象,可在這些部分增加實(shí)時地溫度監(jiān)測系統(tǒng)和電加熱管,以此來維持高于露點(diǎn)的溫度,避免絕緣件表面結(jié)露、腐蝕,另外,盡管承壓絕緣子上蓋板開孔使得熱空氣射流的射程變短、回流效果變差,導(dǎo)致更多的承壓絕緣子和絕緣軸表面易受結(jié)露、腐蝕的威脅,但其使得承壓絕緣子內(nèi)外壁溫差減小,同時使得進(jìn)入電除塵器本體的熱空氣流速降低,降低了二次揚(yáng)塵的可能性,通過方案A、B固定點(diǎn)的模擬溫度與實(shí)測溫度的比較可知,對于最不利溫度區(qū)域,方案A、B的模擬結(jié)果與實(shí)測結(jié)果相一致。通過對方案C的數(shù)值模擬結(jié)果的分析可知,通孔的增大使得振打部件周圍的溫度場不能滿足要求,極易在絕緣件表面結(jié)露。該課題的研究為解決絕緣件頻繁破裂問題提供了新的思路,對于工業(yè)生產(chǎn)和環(huán)境保護(hù),具有十分重要的意義。
[Abstract]:In recent years, air pollution is very serious, the state attaches great importance to the control of air pollution. As an important environmental protection equipment, ESP plays an important role in improving air quality. Because the smoke has high dew point, strong corrosiveness, easy to be exposed on the surface of insulating parts, which leads to frequent damage of insulating parts and affects the normal process of production, the traditional way is to install electric heating tubes around the insulation parts, because the electric heating pipes are too close to the insulating parts. The thermal conduction and radiation make the temperature difference between the top and the bottom of porcelain parts too big, and the stress produced by thermal expansion can easily crack the insulating parts and shorten the service life of the insulating parts. It is necessary to replace the insulating parts frequently and cause serious economic losses to the industrial production. In order to solve the problem of frequent insulation damage, the insulator chamber with hot air purging system is numerically simulated, and three kinds of schemes are set up. Different from scheme A, scheme B has a certain number of holes on the upper cover of the insulator. Scheme C is designed to explore the influence of the tunnel on the temperature field and velocity field in insulator room. Firstly, the geometric model is established in SolidWorks, and then it is imported into ICEMCFD for meshing and boundary condition determination. Then the temperature and velocity distribution in the insulator room are calculated by ANSYS fluent, and the results are introduced into Tecplot 360 to get the temperature field and velocity field of air flow. Through the comparative analysis of scheme A and scheme B, it can be seen that the hot air sweep system can not make the temperature of all the vibrating parts inside and around the dew-point temperature higher than that of the dew point, and it is near the inlet. The vibration components near the outlet are prone to appear the phenomenon of temperature lower than the dew point in the surrounding area. The real-time temperature monitoring system and electric heating pipe can be added to these parts to maintain the temperature higher than the dew point and to avoid the surface dew and corrosion of the insulating parts. In addition, although the opening of the upper cover of a pressurized insulator makes the range of the hot air jet shorter and the reflux effect worse, more pressurized insulators and insulating shaft surfaces are vulnerable to exposure and corrosion. However, it reduces the temperature difference between the inner and outer walls of the pressurized insulator, and at the same time reduces the flow velocity of the hot air entering the body of the electrostatic precipitator, thus reducing the possibility of the secondary hoisting dust. The comparison between the simulated temperature and the measured temperature at the fixed point of scheme Anb shows that, For the most unfavorable temperature region, the simulation results of scheme AHB are in agreement with the measured results. Through the analysis of the numerical simulation results of scheme C, it can be seen that the increase of the through hole makes the temperature field around the vibrating parts can not meet the requirements, so it is easy to be exposed on the surface of the insulating parts. The research of this subject provides a new way to solve the problem of frequent rupture of insulating parts and is of great significance for industrial production and environmental protection.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X701.2

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