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劉亞君880530新蟲 (初入文壇)
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為了在穩(wěn)態(tài)下使泡沫分離塔連續(xù)排出泡沫，需使泡沫的流量、持液量和氣液界面吸附密度恒定。泡沫的流量 等于通入的氣體的流量q和泡沫所夾帶液體的量 的和，如式（4）所示。 (4) 泡沫的持液量 由式（5）計算。 (5) 用蠕動泵以恒定流速將原料液加入到泡沫分離塔中，待液池的液面恒定，則進(jìn)料速度 等于塔頂出口泡沫中所夾帶的液體的量，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）算的蠕動泵的進(jìn)料速度。 為了使氣泡的氣液界面吸附密度穩(wěn)定在某一定值，需要保證液池中SDS濃度恒定，所以實驗過程中每隔5 min從塔底取樣，兩次取樣濃度相同為止，此時泡沫分離塔中形成的泡沫達(dá)到穩(wěn)態(tài)，然后將泡沫導(dǎo)入泡沫收集裝置中進(jìn)行消泡研究。依次從泡沫收集裝置底部向上增加篩板數(shù)目，而且每次實驗之前都要使用原料液潤洗泡沫收集裝置，排除壁的潤濕情況對實驗結(jié)果造成的影響。記錄泡沫裝滿整個收集裝置的時間，根據(jù)式（7）計算消泡率R。 （7） 其中 為剩余泡沫的體積， 為通入泡沫收集裝置中的泡沫的總體積，t為泡沫裝滿整個收集裝置所用的時間。每個條件下做三次實驗求平均值作為結(jié)果。所有實驗在室溫 下進(jìn)行，環(huán)境濕度為 。 |
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【答案】應(yīng)助回帖
★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
劉亞君880530: 金幣+25, 翻譯EPI+1, ★有幫助, 你可能不是很了解我的專業(yè)知識，但是你很用心，謝謝了！ 2012-12-21 09:18:34
劉亞君880530: 金幣+25, 翻譯EPI+1, ★有幫助, 你可能不是很了解我的專業(yè)知識，但是你很用心，謝謝了！ 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? 指的是表面活性劑的吸附么？) 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 (這里少了一個變量名？), 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 (不知液池的專業(yè)術(shù)語是什么，暫譯作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 (這里少了一個變量名？) is the volume of the remaining foam, V_t (這里少了一個變量名？) 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樓2012-12-21 07:49:44
sklyer_123
銀蟲 (小有名氣)
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- 注冊: 2012-12-20
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- 專業(yè): 會計與審計
【答案】應(yīng)助回帖
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劉亞君880530: 金幣+5, 只能說你辛苦了 2012-12-26 08:48:43
劉亞君880530: 金幣+5, 只能說你辛苦了 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樓2012-12-25 22:39:57
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