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为了在稳态下使泡沫分离塔连续排出泡沫，需使泡沫的流量、持液量和气液界面吸附密度恒定。泡沫的流量 等于通入的气体的流量q和泡沫所夹带液体的量 的和，如式（4）所示。 (4) 泡沫的持液量 由式（5）计算。 (5) 用蠕动泵以恒定流速将原料液加入到泡沫分离塔中，待液池的液面恒定，则进料速度 等于塔顶出口泡沫中所夹带的液体的量，如式（6）所示。 (6) 所以已知泡沫的流量以及泡沫的持液量即可由公式（5）算的蠕动泵的进料速度。 为了使气泡的气液界面吸附密度稳定在某一定值，需要保证液池中SDS浓度恒定，所以实验过程中每隔5 min从塔底取样，两次取样浓度相同为止，此时泡沫分离塔中形成的泡沫达到稳态，然后将泡沫导入泡沫收集装置中进行消泡研究。依次从泡沫收集装置底部向上增加筛板数目，而且每次实验之前都要使用原料液润洗泡沫收集装置，排除壁的润湿情况对实验结果造成的影响。记录泡沫装满整个收集装置的时间，根据式（7）计算消泡率R。 （7） 其中 为剩余泡沫的体积， 为通入泡沫收集装置中的泡沫的总体积，t为泡沫装满整个收集装置所用的时间。每个条件下做三次实验求平均值作为结果。所有实验在室温 下进行，环境湿度为 。 |
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刘亚君880530: 金币+25, 翻译EPI+1, ★有帮助, 你可能不是很了解我的专业知识，但是你很用心，谢谢了！ 2012-12-21 09:18:34
刘亚君880530: 金币+25, 翻译EPI+1, ★有帮助, 你可能不是很了解我的专业知识，但是你很用心，谢谢了！ 2012-12-21 09:18:34
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(I'm not familiar with your background, and the translation of many technical terms are found from this thesis: https://personalpages.manchester ... _fractionation.pdf) To keep the foam fractionation column (FFC) continuously producing foam at a steady state, it is necessary to maintain the flow rate of foam, the liquid hold-up, and the degree of absorption (of surfactants? 指的是表面活性剂的吸附么？) at the air-water interface all at constant levels. The flow rate of foam equals the sum of the flow rate of gas, q, and the flow rate of liquid carried by the foam, p (这里少了一个变量名？), as shown in equation (4). .............................................................................(4) The liquid hold-up of the foam is calculated by equation (5). .............................................................................(5) The bulk solution was added into the FFC using a peristaltic pump at a constant flow rate, and when the liquid level in the pool (不知液池的专业术语是什么，暂译作pool, 下同) was steady, it indicated that the flow rate of feeding stream equals the flow rate of the liquid carried up in the foam out of the top of the column, as shown in equation (6). ..............................................................................(6) Therefore, the feeding flow rate of the peristaltic pump can be calculated by the known foam flow rate and the liquid hold-up, using equation (5). To maintain the degree of surfactant absorption at air-water interface at a steady value, the SDS concentration in the pool must be kept constant, hence the liquid at the bottom of the column was sampled every 5 minutes during the experiments, until no difference in the SDS concentration was observed. When the foam formation in the FFC was stable, the foams were gathered in a foam collecting apparatus for the study of bubble collapse. The sieve plate (perforated plate) were added into the foam collecting apparatus from the bottom to top, and the number of plates were increased for each run. The foam collecting apparatus was rinsed with bulk solution before each run to avoid the effect of wall wettability. The time of filling the foam collecting appratus was recorded, and the bubble collapsing rate R is calculated by equation (7): ...............................................................................(7) where V_r (这里少了一个变量名？) is the volume of the remaining foam, V_t (这里少了一个变量名？) is the total volume of the foam entered the collecting apparatus, and t is the time of filling the whole apparatus with foam. For each condition, the experiments were repeated three times and the average results were reported. All experiments were performed at room temperature, and the ambient humidity was ... |
2楼2012-12-21 07:49:44
sklyer_123
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刘亚君880530: 金币+5, 只能说你辛苦了 2012-12-26 08:48:43
刘亚君880530: 金币+5, 只能说你辛苦了 2012-12-26 08:48:43
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In order to make the foam fractionation column under steady state continuous discharge bubble, the bubble flow, liquid holdup and gas liquid interface adsorption constant density. Bubble flow is equal to the gas flow rate Q and bubbles entrained liquid volume and, as shown in ( 4). 4. Foam liquid holdup calculation by equation ( 5). 5. Peristaltic pump at a constant flow rate of raw material liquid into the foam fractionation column, when the liquid pool level constant, then feeding speed is equal to the outlet of the bubble in the entrained liquid volume, as shown in ( 6). 6. So known bubble flow and bubble holdup can be calculated by the formula ( 5) calculates a peristaltic pump feed speed. In order to make bubble gas-liquid interfacial adsorption density stable at a certain value, need to ensure that the liquid pool SDS concentration is constant, so the experimental process every 5 min from the bottom of the tower in two sample sampling, concentration of the same date, the foam fractionation column formed foam reaches steady state, and then the foam into the bubble collecting device for eliminating study on bubble. Turn from the bubble collecting device bottom to increase the number of sieve plate, and each experiment before using raw liquid run bubble collecting device, exclusion of wall wetting on the experimental results of the impact of. Foam filled the entire record collection device of the time, according to the type of (7 ) calculating the defoaming rate R. 7. The residual bubble volume, to pass into the bubble collecting device in the total volume of foam, t foam filled the entire collection device used by the time. Each condition three experiment for the average as a result. All experiments performed at room temperature, environment humidity. |
3楼2012-12-25 22:39:57
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