富氧水制备装置的设计和试验研究

发布时间：2018-03-07 17:38

  本文选题：富氧水　切入点：螺旋切割技术　出处：《江南大学》2017年硕士论文　论文类型：学位论文

【摘要】：富氧水广泛应用在食品加工,水产养殖,污水处理等领域,为了满足制备富氧水对低成本,大产量,含氧高的要求,本文采用静态螺旋切割细分子化技术,开发了高效富氧水制备装置,具有能耗低,富氧效果好等优点。而且,目前的机械搅拌法、电解法,溶气释气等富氧水制备方法,因其设备投资成本大,结构复杂,其产量或富氧水平甚至不能够满足工业生产的需要。因此有必要对富氧水制备技术进行更进一步的研究。本文基于气液两相流模型和计算流体力学,首先通过仿真模拟的手段探究静态螺旋切割器对管道内气液两相流的影响,然后使用设计的实验样机进行制备富氧水的试验,分析影响制备富氧水含氧量的因素,并根据各主要因素最佳参数范围,采用单因素和正交试验法对各工艺参数进行优化。创建的新型静态螺旋切割器,其腔芯是由若干切割刀片按一定的螺旋线方程螺旋叠加而成,构成空间任意两点都不连续的空间螺旋切割面。气液两相流以一定的压力或流速流经切割腔时,腔芯表面的高剪切力和腔内湍流将气泡切割细化成微纳米气泡(直径≤10μm),经气液传质强化作用,从而实现氧气过饱和溶解于水中。具体研究内容如下:1.分析富氧水制备原理及气液传质特性。基于气液传质理论,重点设计计算并制造了静态螺旋切割器,分析其功能,以及对加气方式进行了研究设计,然后再设计选取其它相关部件,并最终完成了富氧水制备样机的研制,并对所设计样机的富氧性能进行理论研究;2.基于有限元ANSYS Fluent分析软件采用计算流体力学方法,对关键部件—静态螺旋切割器进行数值模拟仿真,分析了在变压力、变流量的情况下,静态螺旋切割器对管道内气液两相流压力和流速的影响,以及对气液传质的影响。从理论上认识静态螺旋切割器的剪切和湍流性能;3.通过单因素试验研究了主要因素对制备富氧水含氧量的影响,探究和分析各因素对溶氧的影响,发现其变化是先逐渐增大,后趋势平缓。然后选取单因素试验效果较好的参数范围进行正交试验设计,通过极差分析和方差分析表明各因素对制备富氧水含氧量影响强弱排序依次是,水的压力氧气流量水的流量氧气压力。由正交试验找到了制备高含氧量富氧水的最优工艺参数组合即气体流量为0.9 L/min,气体压力为0.2MPa,水的流量为0.7 m3/h,水的压力为0.4 MPa。以氧气作为气体介质时,利用最佳参数组合制备的富氧水含氧量可达45.12 mg/L,较优化前提高了32.40%;4.基于微纳米气泡的稳定性,通过对贮存富氧水溶氧的衰减性分析,发现本装置制备的富氧水在保存良好的情况下,虽随着时间推移,溶氧会有一定的散失,但在保存60d以后,仍然会具有较高水平的溶氧量(20 mg/L以上),可以满足工业、食品发酵等领域的技术需求。理论和试验研究证明本文创建的新型静态螺旋切割器可高效产生微纳米量级的小气泡,氧气的溶解度高,成本低,富氧效果显著。
[Abstract]:Oxygen rich water is widely used in food processing, aquaculture, sewage treatment and other fields, in order to meet the preparation of oxygen enriched water on low cost, high yield, high oxygen content, this paper adopts a static spiral cutting fine molecular technology, developed high efficient oxygen enriched water preparation device has advantages of low energy consumption, good effect of oxygen. Moreover, electrolysis current mechanical stirring method, gas release, oxygen rich water preparation method of dissolved gas, because of its high investment, complex structure, its production or levels of oxygen enrichment can not even meet the needs of industrial production. So it is necessary to further study the preparation technology of oxygen enriched water system. This model and computational fluid dynamics based on the two-phase flow, first through the simulation method of static spiral cutter on influence of gas-liquid two-phase flow in the pipe, and then use the prototype to test the preparation of oxygen rich water, analysis. The influencing factors for preparation of oxygen enriched water oxygen, and according to the main factors of the range of parameters, process parameters were optimized by single factor and orthogonal test method. The static model of spiral cutter is created, the cavity core is composed of a plurality of cutting blades according to certain equations of spiral helix stacking, consisting of arbitrary points in space the spiral is discontinuous cutting surface. The gas-liquid two-phase flow with certain pressure or flow through the cut cavity, the cavity core surface of high shear and turbulence will be refined into a cavity bubble cutting micro nano bubbles (diameter less than 10 m), mass transfer enhancement by liquid, so as to realize oxygen supersaturated dissolved in water. The specific contents are as follows: 1. analysis of oxygen enriched water preparation principle and mass transfer characteristics of gas-liquid mass transfer. Based on the theory, focus on the design and manufacture of spiral cutter, static calculation, analysis the function, and the way of filling The research and design, and then select the design of other related parts, and finally completed the development of oxygen enriched water preparation, and theoretical research on the oxygen performance of the designed prototype; 2. ANSYS Fluent based on finite element analysis software by using CFD method, the key part of the static spiral cutter carried out numerical simulation analysis in variable pressure variable flow under the condition of static spiral cutter on pressure and velocity of gas-liquid two-phase flow in the pipeline, and the effect on the gas-liquid mass transfer. The shear and turbulence properties of spiral cutter from the theory of static understanding; 3. through the influence of single factor experiment to study the main factors on the preparation of oxygen enriched water oxygen the exploration and analysis of influencing factors of dissolved oxygen, it is found that the change is gradually increased, after the trend gently. And then select the parameter range effect test of single factor orthogonal better Test design by range analysis and variance analysis showed that the factors of oxygen enriched water preparation system strength sorting is the flow of water pressure, oxygen flow rate of oxygen pressure of the water. By the orthogonal test to find the optimal combination of process parameters for preparation of high oxygen enriched water or gas flow is 0.9 L/min, gas pressure 0.2MPa, the water flow is 0.7 m3/h, the water pressure is 0.4 MPa. with oxygen as the gas medium, using oxygen enriched water optimal combination of preparation of oxygen can reach 45.12 mg/L was 32.40% higher than before optimization; the 4. is based on the stability of micro nano bubbles, based on the analysis of attenuation of dissolved oxygen enriched water storage, found the device for preparing oxygen enriched water in the preservation of good, although with the passage of time, there will be some loss of oxygen, but in the preservation of 60d, the amount of dissolved oxygen will still have high level (more than 20 mg/ L), can be full of The technology demand of foot industry, food fermentation and other fields is discussed. Theoretical and experimental studies have proved that the new static spiral cutter created in this paper can produce small and micro bubbles with high efficiency. The oxygen solubility is high, the cost is low, and the effect of oxygen enrichment is remarkable.

【学位授予单位】：江南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ123.5

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