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Explanation of Boiler Feed Water & Its Treatment _ Engineering Chemistry

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Language: en

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explain boiler feedwater and give its
00:00:03.830 00:00:03.840 specifications generally boilers are
00:00:08.720 00:00:08.730 used in industries to generate steam
00:00:10.940 00:00:10.950 which in turn is used to generate power
00:00:13.160 00:00:13.170 and heat thus boiler is a device for
00:00:16.160 00:00:16.170 generating steam it consists of two main
00:00:20.359 00:00:20.369 parts furnace and boiler proper furnace
00:00:29.390 00:00:29.400 provides heat by burning the fuel and
00:00:35.560 00:00:35.570 boiler proper is a device where water
00:00:38.270 00:00:38.280 changes into steam due to heat this
00:00:44.000 00:00:44.010 steam or hot fluid is then recirculated
00:00:46.430 00:00:46.440 out of the boiler to be used in various
00:00:49.069 00:00:49.079 processes in heating applications the
00:00:53.119 00:00:53.129 water which is fed into the boiler is
00:00:54.920 00:00:54.930 called the boiler feedwater these days
00:00:59.060 00:00:59.070 modern boilers require high quality
00:01:01.310 00:01:01.320 water to operate efficiently but such
00:01:04.939 00:01:04.949 water can never be obtained from any of
00:01:07.250 00:01:07.260 the natural sources as it contains
00:01:09.320 00:01:09.330 certain impurities the presence of
00:01:12.109 00:01:12.119 impurities and the water makes it unfit
00:01:14.450 00:01:14.460 for use in the boilers so to make the
00:01:18.289 00:01:18.299 water fit for use in boilers it should
00:01:20.450 00:01:20.460 be pre treated using various techniques
00:01:26.140 00:01:26.150 thus we can say that boiler feedwater is
00:01:29.060 00:01:29.070 specially conditioned water which is fed
00:01:31.850 00:01:31.860 into the boiler to generate steam or hot
00:01:34.550 00:01:34.560 water it is generated through a system
00:01:37.969 00:01:37.979 of heat economy steam produced in the
00:01:41.810 00:01:41.820 boiler is condensed after use and is
00:01:47.510 00:01:47.520 returned as pure feed water called
00:01:50.030 00:01:50.040 the returned water then some fresh water
00:01:53.690 00:01:53.700 or makeup water is added to this return
00:01:56.539 00:01:56.549 water it is this combination of return
00:02:00.050 00:02:00.060 water and make up water which is fed
00:02:05.660 00:02:05.670 into the boiler
00:02:10.240 00:02:10.250 as the boiler feedwater to generate
00:02:12.520 00:02:12.530 steam note that boiler feedwater depends
00:02:15.880 00:02:15.890 upon the quality of the makeup water and
00:02:18.370 00:02:18.380 the amount of condensate returned to the
00:02:20.320 00:02:20.330 boiler sometimes we see that some
00:02:25.360 00:02:25.370 impurities settle down at the bottom of
00:02:27.490 00:02:27.500 the boiler after the steam is produced
00:02:29.730 00:02:29.740 we know that steam which escapes from
00:02:32.380 00:02:32.390 the boiler normally contains liquid
00:02:34.660 00:02:34.670 droplets and gases so the remaining
00:02:37.510 00:02:37.520 water at the bottom of the boiler might
00:02:39.490 00:02:39.500 pick up all the foreign matter from the
00:02:41.320 00:02:41.330 water that was converted to steam this
00:02:44.229 00:02:44.239 results in the accumulation of
00:02:45.970 00:02:45.980 impurities at the bottom of the boiler
00:02:47.910 00:02:47.920 these impurities can be removed by
00:02:50.890 00:02:50.900 discharging some water from the boiler
00:02:52.780 00:02:52.790 to the drain such process of blowing the
00:02:57.820 00:02:57.830 impurities from the boiler to the drain
00:02:59.710 00:02:59.720 is called blowdown operation in order to
00:03:05.380 00:03:05.390 operate and maintain a boiler system
00:03:07.390 00:03:07.400 efficiently it is important to treat the
00:03:09.490 00:03:09.500 boiler feedwater properly this is
00:03:11.979 00:03:11.989 because when steam is produced the
00:03:14.320 00:03:14.330 dissolved solids become concentrated and
00:03:16.930 00:03:16.940 form deposits inside the boiler this
00:03:20.500 00:03:20.510 leads to poor heat transfer and reduces
00:03:23.080 00:03:23.090 the efficiency of the boiler also the
00:03:25.960 00:03:25.970 dissolved gas such as oxygen and carbon
00:03:28.420 00:03:28.430 dioxide react with the metals in the
00:03:30.759 00:03:30.769 boiler system and this leads to boiler
00:03:33.100 00:03:33.110 corrosion thus to protect the boiler
00:03:36.039 00:03:36.049 from such contaminants the boiler
00:03:38.140 00:03:38.150 feedwater should be treated properly
00:03:39.580 00:03:39.590 through external or internal treatment
00:03:43.199 00:03:43.209 let us now discuss the specifications of
00:03:45.970 00:03:45.980 boiler feedwater before using the boiler
00:03:48.670 00:03:48.680 feed water in the boiler it should be
00:03:50.710 00:03:50.720 made sure that it meets the following
00:03:52.630 00:03:52.640 specifications its hardness should be
00:03:55.780 00:03:55.790 below points to parts per million it's
00:03:59.080 00:03:59.090 caustic alkalinity should be between
00:04:01.530 00:04:01.540 0.15 and 0.45 parts per million it's
00:04:06.280 00:04:06.290 soda alkalinity should be between 0.45
00:04:09.310 00:04:09.320 and 1 parts per million it should be
00:04:13.030 00:04:13.040 free from turbidity and sediments and it
00:04:17.259 00:04:17.269 should be free from organic matter oil
00:04:19.360 00:04:19.370 and grease to avoid foaming note that
00:04:23.920 00:04:23.930 thermal power stations feed water is
00:04:26.140 00:04:26.150 usually stored preheated and conditioned
00:04:28.810 00:04:28.820 in the feed water tank and then
00:04:30.610 00:04:30.620 forwarded into the boiler through the
00:04:32.409 00:04:32.419 boiler feedwater pump related terms are

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