本文選題：管道式光生物反應(yīng)器 + 靜態(tài)混合器　； 參考：《華東理工大學(xué)》2015年碩士論文

【摘要】：管道式光生物反應(yīng)器作為目前能源微藻大規(guī)模培養(yǎng)中應(yīng)用最廣泛的一類光生物反應(yīng)器,迫切需要對(duì)其進(jìn)行結(jié)構(gòu)優(yōu)化以提高微藻的混合效果和受光特性。本文對(duì)一種新型管道式光生物反應(yīng)器進(jìn)行了系統(tǒng)研究,開展了PIV流場(chǎng)測(cè)試、CFD模擬、內(nèi)部靜態(tài)混合器優(yōu)化以及管道式光生物反應(yīng)器中藻細(xì)胞受光特性分析等研究。首先,采用粒子圖像測(cè)速技術(shù)(PIV)和CFD數(shù)值模擬方法,分別對(duì)有新型靜態(tài)混合器與不含靜態(tài)混合器的兩種管道式光生物反應(yīng)器的流場(chǎng)進(jìn)行測(cè)量,得出新型靜態(tài)混合器能顯著增強(qiáng)管內(nèi)流體的混合。將PIV測(cè)試結(jié)果與CFD模擬結(jié)果進(jìn)行對(duì)比,顯示基于標(biāo)準(zhǔn)κ-ε模型的數(shù)值計(jì)算方法能很好應(yīng)用于管道式光生物反應(yīng)器的流場(chǎng)模擬,驗(yàn)證了CFD數(shù)值模擬的適用性及可靠性。其次,運(yùn)用計(jì)算流體力學(xué)方法(CFD)對(duì)管道式光生物反應(yīng)器中多種靜態(tài)混合器的混合特性進(jìn)行模擬和計(jì)算,優(yōu)選出了具有最佳混合效果的新型靜態(tài)混合器。接下來(lái)以平均光照方向速度(Uy)、湍動(dòng)能(TKE)、壓強(qiáng)損失和平均流體剪切力等混合特性參數(shù)對(duì)新型靜態(tài)混合器的結(jié)構(gòu)進(jìn)行了模擬優(yōu)化,得到最優(yōu)化的新型靜態(tài)混合器結(jié)構(gòu)參數(shù)為：靜態(tài)混合器兩葉片交叉角度α=90°,相鄰靜態(tài)混合器的間距s=80 mm,靜態(tài)混合器開孔率為16%以及開孔半徑ro=2 mm。最后,結(jié)合粒子追蹤模型和光衰減模型,通過(guò)模擬藻細(xì)胞在管道式光生物反應(yīng)器中的運(yùn)動(dòng)軌跡,進(jìn)而對(duì)藻細(xì)胞在管道式光生物反應(yīng)器中的受光特性進(jìn)行分析。結(jié)果顯示,添加新型靜態(tài)混合器后,在0.3 m/s和0.4 m/s兩種進(jìn)口流速下,藻細(xì)胞光暗交替頻率分別增加了85.21%和95.77%,證明了新型靜態(tài)混合器能夠促進(jìn)藻細(xì)胞在光區(qū)和暗區(qū)之間的交替循環(huán),增強(qiáng)藻細(xì)胞“閃光效應(yīng)”的實(shí)現(xiàn)。
[Abstract]:Tubular photobioreactor is the most widely used photobioreactor in the large-scale cultivation of energy microalgae. It is urgent to optimize its structure in order to improve the mixing effect and light-receiving characteristics of microalgae. In this paper, a new type of tubular photobioreactor is studied systematically. The simulation of PIV flow field test, the optimization of internal static mixer and the analysis of the photoresponse characteristics of algal cells in the tubular photobioreactor are carried out. Firstly, particle image velocimetry (PIV) and CFD numerical simulation were used to measure the flow field of two kinds of tubular photobioreactor with and without static mixer, respectively. It is concluded that the new static mixer can significantly enhance the mixing of fluid in the tube. The comparison between the PIV test results and the CFD simulation results shows that the numerical method based on the standard 魏-蔚 model can be applied to the flow field simulation of the tubular photobioreactor. The applicability and reliability of the CFD numerical simulation are verified. Secondly, the mixing characteristics of many static mixers in a tubular photobioreactor are simulated and calculated by using computational fluid dynamics (CFD) method, and a new type of static mixer with the best mixing effect is selected. Then the structure of the new static mixer is simulated and optimized by the mixing characteristic parameters such as the average illumination direction velocity, the turbulent kinetic energy, the pressure loss and the average fluid shear force. The optimized structural parameters of the new static mixer are as follows: the cross angle of the two blades of the static mixer is 90 擄, the spacing of the adjacent static mixer is 80 mm, the opening rate of the static mixer is 16% and the opening radius of the static mixer is ro=2 m. Finally, combining the particle tracing model and the light attenuation model, the characteristics of the algae cells in the tubular photobioreactor were analyzed by simulating the trajectory of the algal cells in the tubular photobioreactor. The results show that after adding a new static mixer, at the inlet velocity of 0.3 m / s and 0.4 m / s, The alternating frequency of light and dark increased by 85.21% and 95.7777%, respectively, which proved that the new static mixer could promote the alternating cycle between the light and dark areas of algal cells and enhance the realization of "flash effect" of algal cells.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：Q945;TQ033

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