基于CFD的飲用水臭氧消毒裝置的設(shè)計(jì)及優(yōu)化
發(fā)布時(shí)間：2019-06-14 15:36
【摘要】：目前,我國(guó)無(wú)論是城鎮(zhèn)還是農(nóng)村,水資源都存在著較大的安全隱患。農(nóng)村的用水中只有13.8%是符合國(guó)家飲用水標(biāo)準(zhǔn)。在城鎮(zhèn),年久失修的供水管網(wǎng)以及難以保證衛(wèi)生安全的二次供水系統(tǒng),也導(dǎo)致自來(lái)水在到達(dá)用戶家中時(shí)不能達(dá)到標(biāo)準(zhǔn),同時(shí)也導(dǎo)致了我國(guó)的直飲水計(jì)劃難以推行。論文中設(shè)計(jì)的臭氧水消毒裝置能解決上述的自來(lái)水的二次污染的問(wèn)題。 裝置以臭氧為消毒載體,包括四大部分,分別是：臭氧的制備、臭氧向水中的傳質(zhì)、臭氧水與自來(lái)水的反應(yīng)、尾氣的處理。在用臭氧處理水時(shí),隨著水質(zhì)的變化及水處理量的變化,臭氧的投加量及處理時(shí)間也會(huì)發(fā)生變化,整套裝置的設(shè)計(jì)也會(huì)發(fā)生變更。初將水處理量定為40L/min,查找行業(yè)相關(guān)參數(shù),結(jié)合水質(zhì)的情況,可將水中臭氧的反應(yīng)濃度定為2mg/L,反應(yīng)時(shí)間定為10min。根據(jù)以上參數(shù),計(jì)算選擇臭氧發(fā)生器的類(lèi)型及產(chǎn)量,臭氧水混合泵的型號(hào),反應(yīng)器的有效容積,以及各管路的公稱(chēng)直徑及材料。確定裝置采用間接供氣的反應(yīng)方式及連續(xù)的工作模式。間接供氣的反應(yīng)方式通過(guò)臭氧水混合泵吸收臭氧,然后利用產(chǎn)出的臭氧水與待反應(yīng)水反應(yīng)。由于本裝置尾氣量并不像直接供氣反應(yīng)器那么大,所以采用分子篩或硅膠吸附的方法去除多余尾氣中的臭氧。 臭氧的消毒效率是利用CT值來(lái)評(píng)價(jià)的。C表示臭氧在水中的濃度,T表示臭氧在水中的停留時(shí)間,CT值越大則消毒效果越好,而過(guò)大的C值可能產(chǎn)生超標(biāo)的DBPs。而在實(shí)際應(yīng)用中也使用CT1o來(lái)代替CT計(jì)算臭氧的消毒效率。臭氧水與待反應(yīng)水是在反應(yīng)器中接觸并反應(yīng)的,論文中希望能通過(guò)合理的設(shè)計(jì)優(yōu)化反應(yīng)內(nèi)的結(jié)構(gòu),改善臭氧在水中的停留時(shí)間分布,使得能在較低的臭氧濃度的情況下取得較高臭氧的消毒效率。文中將臭氧水反應(yīng)器分為兩個(gè)功能區(qū),即推流區(qū)和混合區(qū)。推流區(qū)中以推流為主要流態(tài),推流是通過(guò)減小跨距的設(shè)計(jì)來(lái)實(shí)現(xiàn)的,臭氧水是在推流區(qū)中注入反應(yīng)器。推流的流態(tài)能使流經(jīng)該區(qū)域的水的停留時(shí)間相差不多,從而與臭氧接觸的時(shí)間也較為均衡,不至于形成部分水流過(guò)度臭氧化而浪費(fèi)臭氧。所設(shè)計(jì)的混合區(qū)中以渦流的流態(tài)為主,渦流是通過(guò)增加區(qū)域的跨距以及布置導(dǎo)流板來(lái)實(shí)現(xiàn)的,渦流能降低臭氧的濃度梯度,使臭氧濃度分布更均勻,利于提高臭氧的利用率。 設(shè)計(jì)的臭氧水反應(yīng)器共有9個(gè)區(qū)域。C1-C4區(qū)屬于功能區(qū)1,其中流態(tài)以推流為主；C5-C9區(qū)屬于功能區(qū)2,其中的流態(tài)以渦流為主。在分析內(nèi)部的流體狀態(tài)時(shí),使用了計(jì)算流體力學(xué)(CFD)以及Gambit和Fluent軟件。建立了反應(yīng)器的物理模型,并進(jìn)行了數(shù)值計(jì)算。根據(jù)數(shù)值計(jì)算的結(jié)果得出了如下結(jié)論： (1)C1-C4區(qū)以推流流態(tài)為主,但是有較嚴(yán)重的短流現(xiàn)象,導(dǎo)致了水流在該區(qū)域內(nèi)的停留時(shí)間分布不均。 (2)C5-C9區(qū)中的渦流流態(tài)不明顯,也存在較為嚴(yán)重的短流現(xiàn)象。 根據(jù)數(shù)值計(jì)算的結(jié)果,分別提出了兩種優(yōu)化方案,方案一和方案二。對(duì)方案一和方案二建立物理模型和數(shù)值計(jì)算,得出如下結(jié)論： (1)方案一中C5-C9區(qū)中導(dǎo)流板的布置相比方案二要合理,能較好的促進(jìn)渦流的產(chǎn)生及合理分布。 (2)方案二中C1-C4區(qū)導(dǎo)流板的布置以及隔板的尺寸設(shè)計(jì)較方案一得到了較優(yōu)的結(jié)果。 (3)在以上方案分析的基礎(chǔ)上提出了更為合理的優(yōu)化方案：反應(yīng)器的C1-C4區(qū),采用方案二的優(yōu)化方式；反應(yīng)器的C5-C9區(qū)采用方案一的優(yōu)化方式。結(jié)合兩種方案的優(yōu)點(diǎn),使得反應(yīng)器內(nèi)的水流狀態(tài)更加符合設(shè)計(jì)要求。
[Abstract]:At present, there are great potential safety hazards in both urban and rural areas. Only 13.8 per cent of the rural water is in line with the national drinking water standards. The secondary water supply system, which is difficult to guarantee the sanitation and safety, can not reach the standard when it reaches the user's home, and the direct drinking water plan of our country is hard to implement. The ozone water disinfection device designed in the paper can solve the problem of secondary pollution of the running water. The device uses ozone as a disinfection carrier, which comprises four parts, namely, the preparation of ozone, the mass transfer of the ozone into the water, the reaction of the ozone water and the tap water, and the tail gas In the process of treating water with ozone, with the change of water quality and water treatment capacity, the dosage of ozone and the treatment time will also change, and the design of the whole set of devices will change. At the beginning, the water treatment capacity is set to 40 L/ min, the relevant parameters of the industry are found, the reaction concentration of the ozone in the water can be set to 2 mg/ L, and the reaction time is set to 10 mi in combination with the water quality. N. According to the above parameters, calculate the type and yield of the selected ozone generator, the model of the ozone water mixing pump, the effective volume of the reactor, and the nominal diameter and the material of each pipeline. Material. Determination device adopts indirect gas supply reaction mode and continuous working mode and the ozone is absorbed by the ozone water mixing pump in a reaction mode of indirect air supply, and then the generated ozone water and the water to be reacted due to the fact that the tail gas quantity of the device is not as large as the direct gas supply reactor, the odor of the excess tail gas is removed by adopting a molecular sieve or a silica gel adsorption method, The efficiency of the disinfection of ozone is to use the CT value . C indicates the concentration of ozone in water, T represents the residence time of the ozone in water, the higher the CT value, the better the disinfection effect, and the too large C value may result in a superscalar D. BPs. CT1o is also used in practical applications instead of CT to calculate ozone The ozone water and the water to be reacted are contacted and reacted in a reactor, and in the paper, it is desirable to optimize the structure in the reaction through a reasonable design, to improve the residence time distribution of the ozone in the water, so that the elimination of the higher ozone can be achieved in the case of lower ozone concentration. In this paper, the ozone water reactor is divided into two functional areas, namely, the flow-pushing area and the flow-off area. In that flow area, the push-flow is the main flow state, the push-flow is realized by reducing the design of the span, and the ozone wat is injected in the flow-out area. the flow pattern of the push-flow can make the residence time of the water flowing through the area to be similar, so that the time of contact with the ozone is also balanced, so that the part of the water flow is not over-ozonated and the wave is not formed, the vortex flow is mainly realized by increasing the span of the region and arranging the guide plate, so that the concentration gradient of the ozone can be reduced, the distribution of the ozone concentration is more uniform, the utilization ratio of the designed ozone water reactor There are 9 areas. The C1-C4 area belongs to the functional area 1, where the flow state is the main flow, and the C5-C9 area belongs to the functional area 2, where the flow pattern The computational fluid dynamics (CFD) and Gamit and Flu are used in the analysis of the fluid state in the interior. The physical model of the reactor is established, and the physical model of the reactor is established. The numerical calculation is based on the results of the numerical calculation. The following conclusions are as follows: (1) The C1-C4 region is dominated by the push-flow state, but there is a serious short-flow phenomenon, which leads to the stop of the water flow in the region. The residual time distribution is not uniform. (2) The vortex flow pattern in the C5-C9 region is not obvious, and it also exists. In this paper, two kinds of excellent short-flow phenomena are put forward according to the result of the numerical calculation. (b) The establishment of a physical model for programme I and II, as well as in programme I and II. The numerical calculation results in the following conclusion: (1) The arrangement of the guide plate in the C5-C9 area of the scheme is reasonable and can be better than that of the scheme 2. to promote the generation and reasonable distribution of the vortex, (2) the arrangement of the guide plate in the C1-C4 region of the scheme II and the ruler of the partition plate, (3) A more reasonable optimization scheme is put forward on the basis of the above scheme analysis: the C1-C4 area of the reactor and the optimization method of the scheme II are adopted; and the reactor The C5-C9 region of the invention adopts the optimization mode of the scheme I. The advantages of the two schemes are combined,
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類(lèi)號(hào)】：R123.1
本文編號(hào)：2499494
[Abstract]:At present, there are great potential safety hazards in both urban and rural areas. Only 13.8 per cent of the rural water is in line with the national drinking water standards. The secondary water supply system, which is difficult to guarantee the sanitation and safety, can not reach the standard when it reaches the user's home, and the direct drinking water plan of our country is hard to implement. The ozone water disinfection device designed in the paper can solve the problem of secondary pollution of the running water. The device uses ozone as a disinfection carrier, which comprises four parts, namely, the preparation of ozone, the mass transfer of the ozone into the water, the reaction of the ozone water and the tap water, and the tail gas In the process of treating water with ozone, with the change of water quality and water treatment capacity, the dosage of ozone and the treatment time will also change, and the design of the whole set of devices will change. At the beginning, the water treatment capacity is set to 40 L/ min, the relevant parameters of the industry are found, the reaction concentration of the ozone in the water can be set to 2 mg/ L, and the reaction time is set to 10 mi in combination with the water quality. N. According to the above parameters, calculate the type and yield of the selected ozone generator, the model of the ozone water mixing pump, the effective volume of the reactor, and the nominal diameter and the material of each pipeline. Material. Determination device adopts indirect gas supply reaction mode and continuous working mode and the ozone is absorbed by the ozone water mixing pump in a reaction mode of indirect air supply, and then the generated ozone water and the water to be reacted due to the fact that the tail gas quantity of the device is not as large as the direct gas supply reactor, the odor of the excess tail gas is removed by adopting a molecular sieve or a silica gel adsorption method, The efficiency of the disinfection of ozone is to use the CT value . C indicates the concentration of ozone in water, T represents the residence time of the ozone in water, the higher the CT value, the better the disinfection effect, and the too large C value may result in a superscalar D. BPs. CT1o is also used in practical applications instead of CT to calculate ozone The ozone water and the water to be reacted are contacted and reacted in a reactor, and in the paper, it is desirable to optimize the structure in the reaction through a reasonable design, to improve the residence time distribution of the ozone in the water, so that the elimination of the higher ozone can be achieved in the case of lower ozone concentration. In this paper, the ozone water reactor is divided into two functional areas, namely, the flow-pushing area and the flow-off area. In that flow area, the push-flow is the main flow state, the push-flow is realized by reducing the design of the span, and the ozone wat is injected in the flow-out area. the flow pattern of the push-flow can make the residence time of the water flowing through the area to be similar, so that the time of contact with the ozone is also balanced, so that the part of the water flow is not over-ozonated and the wave is not formed, the vortex flow is mainly realized by increasing the span of the region and arranging the guide plate, so that the concentration gradient of the ozone can be reduced, the distribution of the ozone concentration is more uniform, the utilization ratio of the designed ozone water reactor There are 9 areas. The C1-C4 area belongs to the functional area 1, where the flow state is the main flow, and the C5-C9 area belongs to the functional area 2, where the flow pattern The computational fluid dynamics (CFD) and Gamit and Flu are used in the analysis of the fluid state in the interior. The physical model of the reactor is established, and the physical model of the reactor is established. The numerical calculation is based on the results of the numerical calculation. The following conclusions are as follows: (1) The C1-C4 region is dominated by the push-flow state, but there is a serious short-flow phenomenon, which leads to the stop of the water flow in the region. The residual time distribution is not uniform. (2) The vortex flow pattern in the C5-C9 region is not obvious, and it also exists. In this paper, two kinds of excellent short-flow phenomena are put forward according to the result of the numerical calculation. (b) The establishment of a physical model for programme I and II, as well as in programme I and II. The numerical calculation results in the following conclusion: (1) The arrangement of the guide plate in the C5-C9 area of the scheme is reasonable and can be better than that of the scheme 2. to promote the generation and reasonable distribution of the vortex, (2) the arrangement of the guide plate in the C1-C4 region of the scheme II and the ruler of the partition plate, (3) A more reasonable optimization scheme is put forward on the basis of the above scheme analysis: the C1-C4 area of the reactor and the optimization method of the scheme II are adopted; and the reactor The C5-C9 region of the invention adopts the optimization mode of the scheme I. The advantages of the two schemes are combined,
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類(lèi)號(hào)】：R123.1
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