What is MULTIPLE-EFFECT EVAPORATOR What does MULTIPLE-EFFECT EVAPORATOR mean

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a multiple effect evaporator as defined
00:00:20.840 00:00:20.850 in chemical engineering is an apparatus
00:00:23.090 00:00:23.100 for efficiently using the heat from
00:00:25.490 00:00:25.500 steam to evaporate water in a multiple
00:00:29.029 00:00:29.039 effect evaporator water is boiled in a
00:00:31.820 00:00:31.830 sequence of vessels each held at a lower
00:00:34.430 00:00:34.440 pressure than the last because the
00:00:37.459 00:00:37.469 boiling temperature of water decreases
00:00:39.110 00:00:39.120 as pressure decreases the vapor boiled
00:00:42.260 00:00:42.270 off in one vessel can be used to heat
00:00:44.479 00:00:44.489 the next and only the first vessel at
00:00:47.029 00:00:47.039 the highest pressure requires an
00:00:49.190 00:00:49.200 external source of heat while in theory
00:00:52.600 00:00:52.610 evaporators may be built with an
00:00:54.830 00:00:54.840 arbitrarily large number of stages
00:00:57.400 00:00:57.410 evaporators with more than four stages
00:00:59.869 00:00:59.879 are rarely practical acceptance systems
00:01:02.450 00:01:02.460 where the liquor is the desired product
00:01:04.729 00:01:04.739 such as in chemical recovery systems
00:01:06.830 00:01:06.840 where up to 7 effects are used the
00:01:10.130 00:01:10.140 multiple effect evaporator was invented
00:01:12.469 00:01:12.479 by an african-american inventor and
00:01:14.510 00:01:14.520 engineer Norbert raloo although he may
00:01:17.719 00:01:17.729 have designed the upper Attis during the
00:01:19.700 00:01:19.710 1820s and constructed a prototype in
00:01:22.539 00:01:22.549 1834 he did not build the first
00:01:25.249 00:01:25.259 industrially practical evaporator until
00:01:27.999 00:01:28.009 1845 originally designed for
00:01:31.719 00:01:31.729 concentrating sugar in sugar cane juice
00:01:34.249 00:01:34.259 it has since become widely used in all
00:01:36.980 00:01:36.990 industrial applications where large
00:01:38.990 00:01:39.000 volumes of water must be evaporated such
00:01:42.289 00:01:42.299 as salt production and water
00:01:43.819 00:01:43.829 desalination multiple effect evaporator
00:01:48.490 00:01:48.500 bolete in the condensate to preheat
00:01:51.020 00:01:51.030 liquor to be flashed in practice the
00:01:54.350 00:01:54.360 design liquid flow paths can be somewhat
00:01:56.690 00:01:56.700 complicated in order to extract the most
00:01:59.060 00:01:59.070 recoverable heat and to obtain the
00:02:01.280 00:02:01.290 highest evaporation rates from the
00:02:03.170 00:02:03.180 equipment multiple effective operation
00:02:06.560 00:02:06.570 plants and sugar beet factories have up
00:02:08.779 00:02:08.789 to 8 effects
00:02:10.339 00:02:10.349 six effect evaporators are common in the
00:02:13.280 00:02:13.290 recovery of black liquor in the craft
00:02:15.229 00:02:15.239 process for making wood pulp
00:02:18.110 00:02:18.120 [Music]
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