本文關(guān)鍵詞： 表面處理 槽邊排風(fēng) 污染物 數(shù)值模擬 控制風(fēng)速 風(fēng)量計(jì)算　出處：《天津大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：隨著表面處理技術(shù)的迅速發(fā)展,在表面處理過(guò)程中所散發(fā)的污染氣體種類(lèi)也隨之增多,同時(shí)工藝槽型式及尺寸也變得更加多樣化以及控制標(biāo)準(zhǔn)的提高,采用何種局部排風(fēng)形式以及多大的排風(fēng)量才能有效控制表面處理車(chē)間工藝槽所散發(fā)的各種污染氣體已成為目前該車(chē)間通風(fēng)設(shè)計(jì)的關(guān)鍵。盡管對(duì)于不同局部排風(fēng)形式的排風(fēng)量計(jì)算方法國(guó)內(nèi)外已有多種,但這些計(jì)算方法是否依然適用于各種工藝槽型式,需要加以驗(yàn)證。鑒于此,本課題研究在達(dá)到相同污染物控制效果要求時(shí),表面處理車(chē)間中的槽邊排風(fēng)罩型式,工藝槽尺寸以及槽內(nèi)溶液性質(zhì)對(duì)槽邊排風(fēng)量的影響,并與現(xiàn)有的設(shè)計(jì)計(jì)算方法進(jìn)行對(duì)比分析。首先,本課題采用實(shí)驗(yàn)的方法,針對(duì)單側(cè)條縫式槽邊排風(fēng)罩研究了在不同的條縫風(fēng)口風(fēng)速下,槽邊所在平面一定區(qū)域內(nèi)的空氣速度場(chǎng)分布規(guī)律,最終得到了一個(gè)關(guān)于風(fēng)口風(fēng)速、風(fēng)口高度與槽邊所在平面處各點(diǎn)速度的函數(shù)關(guān)系式。此外,本課題還通過(guò)實(shí)驗(yàn)的方法對(duì)鹽酸溶液的蒸發(fā)速率理論計(jì)算公式進(jìn)行了驗(yàn)證,實(shí)驗(yàn)結(jié)果與理論公式所得結(jié)果具有較好的吻合性。其次,本課題采用數(shù)值模擬的方法,首先分別針對(duì)不同污染物溶液性質(zhì)確定了三檔控制風(fēng)速值即0.2m/s、0.25m/s和0.3m/s;然后分析研究了在達(dá)到相同污染物控制效果要求時(shí),槽邊排風(fēng)罩型式、控制風(fēng)速、槽寬以及槽長(zhǎng)對(duì)排風(fēng)量的影響并將各影響因素進(jìn)行耦合后得到排風(fēng)量的計(jì)算公式,結(jié)果表明:(1)在相同的排風(fēng)罩型式、槽長(zhǎng)及控制風(fēng)速下,當(dāng)控制區(qū)污染物濃度達(dá)到衛(wèi)生標(biāo)準(zhǔn)要求時(shí),排風(fēng)量與槽寬近似成線性關(guān)系;(2)控制風(fēng)速越大,排風(fēng)量隨槽寬的增長(zhǎng)率也越大;(3)針對(duì)單側(cè)條縫式排風(fēng)罩,當(dāng)槽寬超過(guò)700mm時(shí),排風(fēng)量隨槽寬的增長(zhǎng)率變大;(4)同種槽子,在滿(mǎn)足衛(wèi)生條件污染物濃度要求時(shí),雙側(cè)條縫總排風(fēng)量比單側(cè)條縫風(fēng)量減少50%以上。最后,通過(guò)對(duì)比本課題所得風(fēng)量計(jì)算值與手冊(cè)計(jì)算值發(fā)現(xiàn),當(dāng)控制風(fēng)速分別為0.2m/s、0.25m/s和0.3m/s時(shí),對(duì)于單側(cè)槽邊排風(fēng),當(dāng)槽寬小于0.6m時(shí),手冊(cè)計(jì)算值偏大,槽寬大于0.6m時(shí),手冊(cè)計(jì)算值偏小;對(duì)于雙側(cè)槽邊排風(fēng),在槽寬1.6m處出現(xiàn)同樣的規(guī)律。
[Abstract]:With the rapid development of surface treatment technology, the types of polluted gases emitted in the process of surface treatment are also increasing, at the same time, the types and sizes of process tanks become more diversified and the control standards are improved. The key to the ventilation design of the workshop is which local exhaust air form and how much exhaust air quantity can be used to effectively control all kinds of polluted gases emitted by the surface treatment workshop process slot, although for different local exhaust air forms, it is the key to the ventilation design of the workshop at present. There are many methods for calculating the exhaust air volume at home and abroad. However, whether these calculation methods are still applicable to all kinds of process tank types need to be verified. In view of this, this paper studies the air cover type of groove side in the surface treatment workshop when the same pollutant control effect is achieved. The effect of the size of the process tank and the properties of the solution in the tank on the air flow rate of the tank side is analyzed and compared with the existing design and calculation methods. Firstly, the experimental method is adopted in this paper. The distribution law of the air velocity field in a certain area of the plane of the slot edge is studied under the different wind speed of the slit tuyere, and a wind speed about the tuyere is obtained. The relationship between the height of tuyere and the velocity of every point in the plane of the edge of the groove. In addition, the theoretical formula of evaporation rate of hydrochloric acid solution is verified by the experimental method. The experimental results are in good agreement with the theoretical results. Secondly, the method of numerical simulation is used in this paper. Firstly, according to the properties of different pollutant solutions, the third controlled wind speed is determined, that is, 0.2m / s 0.25m / s and 0.3m / s respectively. Then, when the same pollutant control effect is achieved, the type of the groove exhaust hood and the control wind speed are analyzed and studied. The influence of slot width and slot length on the exhaust air flow is analyzed and the calculation formula of the exhaust air flow rate is obtained by coupling the factors. The results show that the proportion of the exhaust air volume is the same under the same type of exhaust hood, slot length and controlled wind speed. When the concentration of pollutants in the control area reaches the hygienic standard, the relationship between the exhaust air volume and the slot width is approximately linear. (2) the larger the control wind speed, the greater the increase rate of exhaust air flow with the width of the slot; (3) when the width of the groove exceeds 700mm, the volume of exhaust air increases with the increase of the width of the slot. (4) for the same slot, when the concentration of pollutants in the sanitary condition was satisfied, the total air output of the bilateral slit was more than 50% less than that of the one side slot. Finally. By comparing the calculated values of air volume with those of the manual, it is found that when the controlled wind speed is 0.2m / s / s 0.25m / s and 0.3m / s, respectively, the outlet air is on one side of the slot. When the slot width is less than 0.6 m, the calculation value of the manual is larger, and when the slot width is larger than 0.6 m, the calculation value of the manual is small. For both sides, the same rule appears at the width of 1.6 m.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TU834

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