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How a Firetube Steam Boiler Works - Boiling Point

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Kind: captions
Language: en

00:00:00.269
but we are working on two fire two
00:00:02.180 00:00:02.190 boilers getting the burners already
00:00:04.550 00:00:04.560 getting them set up for a job that we
00:00:06.559 00:00:06.569 have sold recently and it got me
00:00:08.179 00:00:08.189 thinking we need to talk about fire two
00:00:10.100 00:00:10.110 boilers so that's what we're going to do
00:00:11.780 00:00:11.790 we're going to talk about a simple thing
00:00:13.430 00:00:13.440 about a firetube boiler and how it works
00:00:15.169 00:00:15.179 today on the boiling point
00:00:29.310 00:00:29.320 welcome to the boiling point I'm a
00:00:30.990 00:00:31.000 Steven Taylor rental and equipment
00:00:32.760 00:00:32.770 manager here where I thought today we
00:00:35.130 00:00:35.140 talked a little bit about the firetube
00:00:36.330 00:00:36.340 boiler we've done a lot of boiling point
00:00:38.430 00:00:38.440 episodes but we never really talked
00:00:40.620 00:00:40.630 about the fire tube and really how it
00:00:42.390 00:00:42.400 works so it's a very probably simple
00:00:44.820 00:00:44.830 discussion but I think it's something
00:00:46.890 00:00:46.900 that we should talk about so let's just
00:00:48.240 00:00:48.250 first talk we've got our burner we've
00:00:49.830 00:00:49.840 got 150 horsepower boiler it's 150 psi
00:00:53.939 00:00:53.949 design yes and then let's talk about how
00:00:56.760 00:00:56.770 the flame goes in and how the the
00:00:59.369 00:00:59.379 transfer of the gases go yeah now we'll
00:01:02.310 00:01:02.320 get a better view from the back but from
00:01:03.689 00:01:03.699 the front the flame goes down the center
00:01:05.730 00:01:05.740 - which is the Morison tube it hits
00:01:08.640 00:01:08.650 though the the turnaround area in the
00:01:10.590 00:01:10.600 back which is cut off as separated by
00:01:12.390 00:01:12.400 other refractory hits the lower section
00:01:15.180 00:01:15.190 of tubes come to the front again hits a
00:01:17.550 00:01:17.560 turn around goes through the back
00:01:19.080 00:01:19.090 section tubes and out the stock at the
00:01:20.640 00:01:20.650 back free pass okay so the actual flame
00:01:25.170 00:01:25.180 is actually down in the middle of the
00:01:26.610 00:01:26.620 Morison tube and that so the gases are
00:01:29.160 00:01:29.170 inside the tube water is around the tube
00:01:31.649 00:01:31.659 in a firetube boiler fire to boil of the
00:01:33.930 00:01:33.940 fire is in the tube water tube or waters
00:01:36.150 00:01:36.160 in the tube
00:01:36.690 00:01:36.700 okay now on a firetube boiler you can
00:01:38.220 00:01:38.230 have a 15 psi 150 psi design like this
00:01:41.900 00:01:41.910 250 and on up obviously but what makes
00:01:45.030 00:01:45.040 the difference how do they how do they
00:01:46.470 00:01:46.480 actually do that it's all in the
00:01:48.510 00:01:48.520 thickness of the steel and the way they
00:01:50.160 00:01:50.170 go through the ASME code and how they
00:01:51.960 00:01:51.970 build the bore its built to a spec for
00:01:54.180 00:01:54.190 that pressure design okay and from an
00:01:57.000 00:01:57.010 efficiency standpoint maybe talk a
00:01:58.620 00:01:58.630 little bit about that on how how that
00:02:01.140 00:02:01.150 works with the tubes the biggest thing
00:02:04.890 00:02:04.900 on efficiency is is the higher the
00:02:07.350 00:02:07.360 pressure the less efficient the bore is
00:02:10.380 00:02:10.390 going to be because the more energy you
00:02:11.880 00:02:11.890 have to put in that that water to create
00:02:13.800 00:02:13.810 that higher pressure steam okay so
00:02:15.449 00:02:15.459 that's the biggest issue okay from a
00:02:17.580 00:02:17.590 tube standpoint you know everybody's
00:02:19.500 00:02:19.510 going to XID tubes to get more
00:02:20.970 00:02:20.980 efficiency to get more heat transfer
00:02:22.830 00:02:22.840 through the tubes and that's that's
00:02:24.540 00:02:24.550 about the only difference there is okay
00:02:26.160 00:02:26.170 so how much steam does like 150
00:02:27.930 00:02:27.940 horsepower boiler produce 50 100 pounds
00:02:31.410 00:02:31.420 an hour okay so where's the steam at in
00:02:35.820 00:02:35.830 a boiler Steve disengage an area the
00:02:38.309 00:02:38.319 water level is about here just about the
00:02:41.129 00:02:41.139 bottom of this top of this this
00:02:42.960 00:02:42.970 connection so the steam disengaging
00:02:44.910 00:02:44.920 areas is the rest of that area so you
00:02:46.830 00:02:46.840 got this much in top of the boiler that
00:02:48.630 00:02:48.640 has no water in it's all steam coal gas
00:02:50.550 00:02:50.560 okay and so really it's kind of like a
00:02:52.740 00:02:52.750 tea kettle if you will where you're at
00:02:55.260 00:02:55.270 the top to see the top of the water even
00:02:56.970 00:02:56.980 on a tea kettle you'll actually see the
00:02:58.740 00:02:58.750 the bubble starts teen go and it's doing
00:03:01.260 00:03:01.270 the exact same thing right here for all
00:03:02.880 00:03:02.890 the steams all that is a big old tea con
00:03:04.500 00:03:04.510 honey how do they keep the water from
00:03:07.170 00:03:07.180 sucking out of it it's a natural
00:03:09.780 00:03:09.790 phenomenon as long as the water is pure
00:03:11.700 00:03:11.710 in other words long as your TDS is down
00:03:13.830 00:03:13.840 to a certain level within limits then
00:03:16.170 00:03:16.180 the water won't go out with the steam
00:03:18.780 00:03:18.790 the water stays in the water because of
00:03:20.250 00:03:20.260 the pressure just holds the water there
00:03:21.750 00:03:21.760 the only thing will go out as a steam we
00:03:23.520 00:03:23.530 have a dry pan in there that helps that
00:03:25.500 00:03:25.510 but as long as the water level is held
00:03:27.870 00:03:27.880 where it's supposed to be and your total
00:03:30.180 00:03:30.190 dissolved solids are where they're
00:03:31.410 00:03:31.420 supposed to be the only thing going out
00:03:33.300 00:03:33.310 is a gas the steam itself that's all
00:03:35.010 00:03:35.020 that's going out in the nozzle okay
00:03:36.480 00:03:36.490 another question why would someone use a
00:03:39.390 00:03:39.400 fire to boil their verses of water to
00:03:41.760 00:03:41.770 boil in a smaller bore it's a lot less
00:03:45.230 00:03:45.240 money it's just more economical to use a
00:03:47.880 00:03:47.890 fire tube than it is a water tube just a
00:03:50.130 00:03:50.140 long the short of it okay what about
00:03:51.960 00:03:51.970 ramped up on steam which one's the the
00:03:55.590 00:03:55.600 water tube is quicker the other thing
00:03:58.020 00:03:58.030 that is good about a fire tube if you
00:04:00.630 00:04:00.640 have a batch process where you have a
00:04:04.080 00:04:04.090 big steam valve that opens up and sucks
00:04:05.910 00:04:05.920 all kinds of steam in shuts back off the
00:04:07.740 00:04:07.750 fire tube has a lot more steam holding
00:04:09.930 00:04:09.940 area the disengaging area there's a lot
00:04:11.759 00:04:11.769 larger on a fire tube than water - okay
00:04:14.580 00:04:14.590 water to make steam immediate fire to
00:04:16.650 00:04:16.660 make steam and holds it there and then
00:04:18.300 00:04:18.310 you have something search with okay now
00:04:19.949 00:04:19.959 we talked a little bit about the tubes
00:04:21.150 00:04:21.160 why don't we walk around back and we'll
00:04:23.159 00:04:23.169 take a look at the tubes and see that
00:04:25.110 00:04:25.120 all right so we're coming back to the
00:04:26.970 00:04:26.980 back of the boiler we thought we'd give
00:04:28.260 00:04:28.270 you a good look as we've talked a little
00:04:29.970 00:04:29.980 bit about the the tubes and you can
00:04:31.980 00:04:31.990 actually see it so maybe Stephen take us
00:04:33.480 00:04:33.490 through what you were talking about we
00:04:34.740 00:04:34.750 can actually see it so this is the the
00:04:36.240 00:04:36.250 Morse or tube the main the burners on
00:04:38.220 00:04:38.230 the other end the main flame is coming
00:04:39.780 00:04:39.790 down it doesn't come all the way to the
00:04:41.370 00:04:41.380 back
00:04:41.850 00:04:41.860 you know it'll come down two-thirds the
00:04:43.409 00:04:43.419 way down the that Morison tube when
00:04:45.840 00:04:45.850 those hot gases again it's not fire back
00:04:48.510 00:04:48.520 here just hot gases when it hits this
00:04:50.100 00:04:50.110 rear door the refractory that those
00:04:53.490 00:04:53.500 gases turn they go back up these tubes
00:04:56.080 00:04:56.090 they hit the front of the boiler turn
00:04:57.640 00:04:57.650 again come back through these tubes go
00:04:59.740 00:04:59.750 out the stack again by the time when it
00:05:01.840 00:05:01.850 when it when the gas is hit here they're
00:05:03.550 00:05:03.560 going to be in that twenty five twenty
00:05:05.680 00:05:05.690 two hundred degree range when they go
00:05:07.690 00:05:07.700 out here we'll have them down in the
00:05:09.340 00:05:09.350 four hundred degree range all the rest
00:05:11.170 00:05:11.180 of that heat is absorbed by the water
00:05:12.400 00:05:12.410 itself creating steam okay and is that
00:05:14.710 00:05:14.720 pretty much typical of all sizes
00:05:16.930 00:05:16.940 different passes this type of design
00:05:19.030 00:05:19.040 yeah it is it's pretty typical you know
00:05:21.190 00:05:21.200 this is a three pass unit you've got to
00:05:23.620 00:05:23.630 pass units to where the stack would be
00:05:25.180 00:05:25.190 up to the front and then this would be
00:05:27.100 00:05:27.110 gone the fire comes in or the heat comes
00:05:29.770 00:05:29.780 down to Morison tube hits all of these
00:05:31.870 00:05:31.880 tubes goes back to the front at the top
00:05:34.110 00:05:34.120 and then you have a four pass that comes
00:05:36.820 00:05:36.830 back here
00:05:37.540 00:05:37.550 turns goes to the front comes to the
00:05:39.160 00:05:39.170 back goes back to the front again mm-hmm
00:05:41.140 00:05:41.150 and that's just really gaining a little
00:05:42.820 00:05:42.830 bit more efficiency or what what's the
00:05:44.920 00:05:44.930 lies why do we yeah
00:05:47.320 00:05:47.330 everybody has their own theory about it
00:05:49.480 00:05:49.490 you can put a high efficiency burner on
00:05:52.060 00:05:52.070 the bore and get the same efficiency out
00:05:53.920 00:05:53.930 of water as you can with with just use
00:05:55.930 00:05:55.940 the four pass so it everybody has their
00:05:57.640 00:05:57.650 own theory about it okay and real quick
00:05:59.680 00:05:59.690 on the back door the refractory what
00:06:01.420 00:06:01.430 this this refractory is a high
00:06:03.190 00:06:03.200 temperature high modulus refractory so
00:06:06.040 00:06:06.050 it's set up to where it has very little
00:06:08.320 00:06:08.330 shrinkage if you have a lot of shrinkage
00:06:10.000 00:06:10.010 in this refractory then you're going to
00:06:11.380 00:06:11.390 get creases around it's gonna crack all
00:06:12.940 00:06:12.950 kinds of problems we've worked a long
00:06:14.860 00:06:14.870 time getting the right product to do
00:06:17.170 00:06:17.180 that with and it's good for 3,000
00:06:19.300 00:06:19.310 degrees we don't ever expect to see that
00:06:21.190 00:06:21.200 here but everything is we overcompensate
00:06:23.770 00:06:23.780 for everything that could happen in the
00:06:24.820 00:06:24.830 industry and we're not going to get into
00:06:26.590 00:06:26.600 the water back versus the dry back but
00:06:29.320 00:06:29.330 yeah
00:06:30.130 00:06:30.140 there is a boiling point out there that
00:06:31.630 00:06:31.640 you can go and talk and actually see a
00:06:33.940 00:06:33.950 little bit about what we've talked about
00:06:35.260 00:06:35.270 with the dry back and the water back so
00:06:36.910 00:06:36.920 hey appreciate you stopping by with us
00:06:38.710 00:06:38.720 and we'll see you next time on the
00:06:41.080 00:06:41.090 boiling point well fire two boilers come
00:06:43.510 00:06:43.520 in a lot of different sizes now this is
00:06:45.610 00:06:45.620 a 650 horsepower Mobil boiler that we've
00:06:48.520 00:06:48.530 got and we've actually have them a
00:06:49.870 00:06:49.880 thousand horsepower inside of a trailer
00:06:51.940 00:06:51.950 and the firetube boiler is just so
00:06:53.740 00:06:53.750 widely used so really appreciate Stephen
00:06:56.440 00:06:56.450 talking with us today to tell us a
00:06:58.120 00:06:58.130 little bit about the firetube boiler we
00:07:00.100 00:07:00.110 got something coming up Powergen
00:07:01.690 00:07:01.700 december 13th 14th and 15th make sure
00:07:04.360 00:07:04.370 you come out check us out we got a free
00:07:06.310 00:07:06.320 t-shirt we'd love to see you
00:07:07.840 00:07:07.850 like us on Facebook and
00:07:09.879 00:07:09.889 all of us on Twitter if you don't mind
00:07:11.709 00:07:11.719 maybe share the videos and we'll see you
00:07:14.140 00:07:14.150 next time on the boiling point
00:07:33.590 00:07:33.600 you

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