00:00:00.000 you 00:00:09.12000:00:09.130 today I'd like to introduce you to this 00:00:11.74000:00:11.750 very large Scotch marine fire - steam 00:00:16.09000:00:16.100 boiler this is a dual fuel boiler and it 00:00:19.90000:00:19.910 is a cleaver Brooks rated at around 14 00:00:22.99000:00:23.000 MB or 14 million BTUs let's take a look 00:00:28.21000:00:28.220 at some of the components in the order 00:00:30.13000:00:30.140 that they would start as this boiler 00:00:32.08000:00:32.090 begins its cycle 00:00:37.82000:00:37.830 on a call for steam from the heating 00:00:40.52000:00:40.530 controls one of the first things that's 00:00:42.23000:00:42.240 going to happen is the combustion air 00:00:44.33000:00:44.340 fan is going to be energized this fan is 00:00:47.57000:00:47.580 going to draw air in from this room and 00:00:50.03000:00:50.040 blow it through the combustion chamber 00:00:52.40000:00:52.410 to purge it of any combustibles that may 00:00:54.92000:00:54.930 be present in there from the previous 00:00:56.69000:00:56.700 cycle air is let into the boiler room 00:01:03.93900:01:03.949 through an outside a damper this damper 00:01:08.45000:01:08.460 motor will also be energized at the same 00:01:11.15000:01:11.160 time the fan is to open up this damper 00:01:13.94000:01:13.950 and allow combustion air to enter into 00:01:16.82000:01:16.830 the boiler room the switch up above it a 00:01:19.73000:01:19.740 proving switch will actually send the 00:01:22.60900:01:22.619 signal and prove to the burner that air 00:01:25.28000:01:25.290 has been opened into the boiler room for 00:01:28.49000:01:28.500 the combustion process the next thing we 00:01:31.55000:01:31.560 need for combustion is going to be our 00:01:33.23000:01:33.240 fuel so let's take a look 00:01:43.95000:01:43.960 this is our main gas line and our gas 00:01:46.89000:01:46.900 train large gas pressure regulator which 00:01:52.56000:01:52.570 regulates the gas pressure to the burner 00:01:54.62000:01:54.630 we also have a smaller 3/4 line that has 00:01:58.80000:01:58.810 its own gas pressure regulator this is 00:02:01.77000:02:01.780 for the gas pilot regardless of which 00:02:04.46900:02:04.479 fuel you're using natural gas or any of 00:02:07.98000:02:07.990 the fuel oils a natural gas pilot is 00:02:11.13000:02:11.140 going to be used to light up that fuel 00:02:15.11000:02:15.120 we have a high and low gas pressure 00:02:18.87000:02:18.880 safety we have two modulating gas valves 00:02:23.67000:02:23.680 and a vent valve in between this vent 00:02:27.60000:02:27.610 valve is used to vent any gas that may 00:02:30.42000:02:30.430 get trapped between the two motorized 00:02:32.52000:02:32.530 valves during the off cycle 00:02:42.60000:02:42.610 once air is proven by the proving switch 00:02:46.19000:02:46.200 gas solenoid will open and allow pilot 00:02:49.71000:02:49.720 gas to come up and enter into the burner 00:02:52.41000:02:52.420 a spark igniter will create a spark 00:02:58.02000:02:58.030 across that pilot gas causing that pilot 00:03:00.87000:03:00.880 gas to ignite once that flame is lit a 00:03:05.90000:03:05.910 flame sensor a flame rod or a fire I 00:03:09.78000:03:09.790 once again must prove to the main gas 00:03:13.02000:03:13.030 valves that a pilot is present to light 00:03:16.35000:03:16.360 the main gas otherwise the process will 00:03:20.40000:03:20.410 not continue once flame pilot flame is 00:03:24.21000:03:24.220 proven the main gas valves will open 00:03:26.85000:03:26.860 allowing main gas to enter into the 00:03:30.93000:03:30.940 burner through a valve being controlled 00:03:35.85000:03:35.860 by a modulating motor this particular 00:03:38.88000:03:38.890 burner is a fully modulating burner 00:03:41.81000:03:41.820 there are many different types from the 00:03:45.00000:03:45.010 simple on/off which is used for small 00:03:47.91000:03:47.920 residential applications but also very 00:03:50.31000:03:50.320 inefficient you can have a high and low 00:03:53.61000:03:53.620 fire boiler meaning it has two 00:03:56.07000:03:56.080 capacities usually with two gas valves 00:03:58.97900:03:58.989 or a two-step gas valve a fully 00:04:02.37000:04:02.380 modulating burner which is controlling 00:04:05.46000:04:05.470 the air to fuel ratio with one 00:04:07.50000:04:07.510 modulating motor or you can have even 00:04:10.71000:04:10.720 higher efficiency burners which use 00:04:13.19000:04:13.200 individual modulating motors on the fuel 00:04:16.56000:04:16.570 valve and on the air to get a very 00:04:20.72900:04:20.739 precise match on the air to fuel ratio 00:04:23.99000:04:24.000 significantly increasing the combustion 00:04:26.52000:04:26.530 efficiency once main gas is lit this 00:04:31.92000:04:31.930 modulating motor is going to modulate 00:04:34.20000:04:34.210 that air to fuel ratio based on the 00:04:36.99000:04:37.000 demand as the steam pressure goes up the 00:04:40.29000:04:40.300 modulating motor will reduce the fire 00:04:42.36000:04:42.370 and as the steam pressure goes down it 00:04:44.79000:04:44.800 will increase the fire trying to match 00:04:47.25000:04:47.260 the amount of fuel burned based on what 00:04:50.82000:04:50.830 is needed or required in steam pressure 00:04:53.99900:04:54.00900:04:58.43900:04:58.449 once main gas is lit and the boiler is 00:05:01.68900:05:01.699 fired and in operation the gases of 00:05:05.53000:05:05.540 combustion or the leftover from the 00:05:08.26000:05:08.270 burned fuel gets sent through the fire 00:05:10.84000:05:10.850 tubes they pass through the boiler and 00:05:13.77900:05:13.789 transfer their heat to the water that's 00:05:16.60000:05:16.610 surrounding those tubes in our Scotch 00:05:18.76000:05:18.770 marine boiler 00:05:24.50000:05:24.510 now that we've taken a look at the 00:05:27.39000:05:27.400 operation of this boiler with natural 00:05:29.31000:05:29.320 gas let's take a minute to look over 00:05:31.40900:05:31.419 some of the components for the fuel oil 00:05:33.54000:05:33.550 system there may be times where the 00:05:36.00000:05:36.010 utility will ask you if you have a dual 00:05:38.34000:05:38.350 fuel boiler to come off natural gas to 00:05:40.86000:05:40.870 reduce their demand and operate your 00:05:43.14000:05:43.150 boiler on your fuel oil this number two 00:05:47.34000:05:47.350 fuel oil is being pumped over from the 00:05:50.01000:05:50.020 fuel oil tank it's passing through some 00:05:52.35000:05:52.360 strainers over to the burner to the main 00:05:57.46900:05:57.479 oil pump this oil pump is discharging 00:06:02.58000:06:02.590 and pressurizing that oil and sending it 00:06:05.82000:06:05.830 into the burner where it is actually 00:06:08.87900:06:08.889 mixing with compressed air to increase 00:06:12.75000:06:12.760 the pressure and provide air for 00:06:15.12000:06:15.130 combustion this air & fuel mixture is 00:06:18.68000:06:18.690 then sent into the burner and lit by the 00:06:22.40900:06:22.419 same natural gas pilot just as the 00:06:25.05000:06:25.060 natural gas was lit previously those 00:06:28.74000:06:28.750 gases of combustion 00:06:30.02900:06:30.039 once again travel through the fire tubes 00:06:32.31000:06:32.320 and pass their heat to the water that's 00:06:35.21900:06:35.229 surrounding those tubes 00:06:40.99900:06:41.009 as the fuel oil burns gases of 00:06:44.14900:06:44.159 combustion travel through the fire tubes 00:06:46.15900:06:46.169 and give off their heat to the water 00:06:48.46900:06:48.479 that's surrounding those tubes creating 00:06:50.54000:06:50.550 steam eventually those gases of 00:06:53.48000:06:53.490 combustion travel completely through the 00:06:55.73000:06:55.740 boiler and exit through the boiler 00:06:57.82900:06:57.839 breaching up on top this boiler 00:07:01.12900:07:01.139 breaching carries the gases of 00:07:03.01900:07:03.029 combustion over to the chimney which 00:07:05.51000:07:05.520 travel up through the building and are 00:07:07.79000:07:07.800 expelled up out at roof level many times 00:07:11.86900:07:11.879 you will see some small holes drilled in 00:07:13.96900:07:13.979 the breaching this is in order to use a 00:07:17.48000:07:17.490 combustion analyzer for operators and 00:07:21.07900:07:21.089 analysts alike a combustion analyzer is 00:07:23.89900:07:23.909 a necessary tool in order to see the 00:07:27.01900:07:27.029 combustion efficiency of your boiler 00:07:29.32000:07:29.330 using a combustion analyzer is going to 00:07:32.29900:07:32.309 help the analyst make informed decisions 00:07:34.33900:07:34.349 about options on increasing efficiency 00:07:38.42000:07:38.430 of the boiler so understanding the 00:07:41.89900:07:41.909 combustion process is critical to 00:07:44.71900:07:44.729 efficient boiler operation 00:07:58.54000:07:58.550
Office location
Engineering company LOTUS®
Russia, Ekaterinburg, Lunacharskogo street, 240/12