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What is MULTIPLE-EFFECT EVAPORATOR What does MULTIPLE-EFFECT EVAPORATOR mean
WEBVTT Kind: captions Language: en
00:00:00.000 a multiple effect evaporator as defined 00:00:20.84000:00:20.850 in chemical engineering is an apparatus 00:00:23.09000:00:23.100 for efficiently using the heat from 00:00:25.49000:00:25.500 steam to evaporate water in a multiple 00:00:29.02900:00:29.039 effect evaporator water is boiled in a 00:00:31.82000:00:31.830 sequence of vessels each held at a lower 00:00:34.43000:00:34.440 pressure than the last because the 00:00:37.45900:00:37.469 boiling temperature of water decreases 00:00:39.11000:00:39.120 as pressure decreases the vapor boiled 00:00:42.26000:00:42.270 off in one vessel can be used to heat 00:00:44.47900:00:44.489 the next and only the first vessel at 00:00:47.02900:00:47.039 the highest pressure requires an 00:00:49.19000:00:49.200 external source of heat while in theory 00:00:52.60000:00:52.610 evaporators may be built with an 00:00:54.83000:00:54.840 arbitrarily large number of stages 00:00:57.40000:00:57.410 evaporators with more than four stages 00:00:59.86900:00:59.879 are rarely practical acceptance systems 00:01:02.45000:01:02.460 where the liquor is the desired product 00:01:04.72900:01:04.739 such as in chemical recovery systems 00:01:06.83000:01:06.840 where up to 7 effects are used the 00:01:10.13000:01:10.140 multiple effect evaporator was invented 00:01:12.46900:01:12.479 by an african-american inventor and 00:01:14.51000:01:14.520 engineer Norbert raloo although he may 00:01:17.71900:01:17.729 have designed the upper Attis during the 00:01:19.70000:01:19.710 1820s and constructed a prototype in 00:01:22.53900:01:22.549 1834 he did not build the first 00:01:25.24900:01:25.259 industrially practical evaporator until 00:01:27.99900:01:28.009 1845 originally designed for 00:01:31.71900:01:31.729 concentrating sugar in sugar cane juice 00:01:34.24900:01:34.259 it has since become widely used in all 00:01:36.98000:01:36.990 industrial applications where large 00:01:38.99000:01:39.000 volumes of water must be evaporated such 00:01:42.28900:01:42.299 as salt production and water 00:01:43.81900:01:43.829 desalination multiple effect evaporator 00:01:48.49000:01:48.500 bolete in the condensate to preheat 00:01:51.02000:01:51.030 liquor to be flashed in practice the 00:01:54.35000:01:54.360 design liquid flow paths can be somewhat 00:01:56.69000:01:56.700 complicated in order to extract the most 00:01:59.06000:01:59.070 recoverable heat and to obtain the 00:02:01.28000:02:01.290 highest evaporation rates from the 00:02:03.17000:02:03.180 equipment multiple effective operation 00:02:06.56000:02:06.570 plants and sugar beet factories have up 00:02:08.77900:02:08.789 to 8 effects 00:02:10.33900:02:10.349 six effect evaporators are common in the 00:02:13.28000:02:13.290 recovery of black liquor in the craft 00:02:15.22900:02:15.239 process for making wood pulp 00:02:18.11000:02:18.120 [Music]
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