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Furnaces
The furnace, whose name is derived from the Latin word fornax, which means oven, is a heating device utilized for both home and industrial purposes. Questions about furnaces can be asked and answered here.
1,402 Questions
What role does the reducing agent play in a blast furnace?
The reducing agent grabs oxygen or other impurities from the molten metal so making a more refined product
For example, coke reduces ZnO to Zn and Fe2O3 to Fe
Can an oil furnace be converted to propane?
I have never heard of a way to do this without changing the whole furnace.
Propane furnaces are usually thin steal walled heat exchangers with many burners.
Oil Furnaces have a large burner chamber and then a small heat exchanger above it.
If there is a way, you will need to change the heat exchanger and all electrical components. It may be cheaper in the end to just change the whole furnace.
The air (hot blast and possibly added oxygen) ranges from 1800 to 2200F (depending on equipment and operating conditions. The flame temperature (RAFT) is between 3400 and 4200F. The liquid pig iron is generally about 2700F.
form_title= Furnace Repair form_header= Keep the temperature comfortable when you repair your furnace. How old is your furnace?*= _ [50] Has the furnace ever been repaired?*= () Yes () No Please describe the problem in detail.*= _ [50]
In a blast furnace why are the coke and limestone needed?
coke acts as a reducing agent. It combines with oxygen to form CO which in turn reacts with iron ore to give metallic Iron. Carbon present in coke also produces heat in all oxidation reactions which melts down the metallic iron.
Lime stone (CaCO3) breaks down to CaO upon heating which reacts with SiO2, the main impurity, to flux it out of the furnace
What is the different between furnace and heater?
Good question.
A furnace is a enclosure in which energy in non thermal form (e.g. a fuel) is converted into heat. The inside of the enclosure becomes an intensely hot place.
A heater is an apparatus that heats or provides heat.
In refineries, the terms "furnace" and "heater" are used interchangeably, sometimes with the word "fired" in front of heater.
Is there a difference between diesel fuel used in cars and furnaces?
Yes, the home heating fuel is of a lower quality or cetane rating than that used for an automobile.
also home fuel is not taxed thats why it is dyed red so they cant sell it for autos it will run fine. cetane booster is 4 bucks. by me truckers are tested for red fuel. dont even ask what the fine is many people have 500 gallons in a above ground tank and fill there car as needed at a 1.50 less a gall. cars are not tested in nj so makes you think youcouldnt tell the difference in performance or smoke just color
How do you tell if a gas furnace flu is plugged?
my comfortmaker ignitor was just put in it will not light on its own. If I light it manually
it will light.
Explain the production of cast iron using the cupola furnance?
A Cupola or Cupola furnace is a melting device used in foundries that can be used to melt cast iron, ni-resist iron and some bronzes. The cupola can be made almost any practical size. The size of a cupola is expressed in diameters and can range from 6 inches to 13 feet. The overall shape is cylindrical and the equipment is arranged vertically, usually supported by four legs. The overall look is similar to a large smokestack.
Cupola and Cupolet operation. CUPOLA VRS CUPOLET Both are the same in most respects from the tuyeres down. The cupolet is short and has a lid to maintain pressure and heat inside the furnace. The cupola has a tall stack and no lid. The operation varies only in how the furnace is charged. The cupolet is a batch melter. The iron charge is bashed very small and the full amount of metal to tap can be charged at one time. When charging be sure not to let the coke bed get too low. If the tap is 100lbs you can often charge the full amount all at one time or as much as will fit in the furnace. Watch the tuyeres as the iron rains and when it stops its time to tap. The cupola is charged in smaller amounts in sequence. If the tap is 100lbs then charge 25lbs iron then 5lbs coke then iron then coke etc. To know when to tap keep time with the charges. Usually 7-10minuts to melt a charge. Mark the time of the first iron charge and watch the tuyeres for the first drops iron. This will give you an idea of how fast you are melting. The slag hole is often used to determine when to tap. As the well fills with iron the slag will run. When iron runs from the slag hole the well is full and the furnace is taped. Conversely cupolets don't always have a slag hole. After a tap the tap hole is left open to run off the slag. Be sure not to over fill a furnace with no slag hole or iron and slag will pour into the wind box. AIR As a general rule of thumb, more is better. If there is any doubt you probably need more. 2 or 3 electric or gas leaf blowers (gas is not recommended due to the fact that you have GAS at an iron pour) would be ok to use on a 16inch furnace. Squirrel cage blowers are no good. Pressure is critical not just volume. In general, for a 16inch bore furnace, 600-900 CFM and 2+ inches of water. (as read on a manometer). Default to more air. BOTOM SAND Ram the sand so that it slopes to the tap. In general, the steeper the slope the better. In some cupolas the sand slopes from the height of the slag hole to the tap hole. However! A steep slope greatly increases the hydraulic pressure at the tap hole and bots have been known to break out. This can happen at any moment. Use anything you want just be sure it cannot run out the bottom like an hourglass. COKE When loading the furnace before burn in use softball size coke (bed coke) and fill to the tuyere level. Then use coke about half that size to fill the rest. Be sure to make room at the tap for burn in and taping. Build a cave at the bottom and also at the tuyeres. Always avoid blocking holes. BURN IN The burn in is the most critical time of the iron pour other than the tap. Almost all the problems that might arise are often linked with a poor burn in. burning in with a gas burner (propane or other) is the easiest way. It allows you to make the coke bed just right and if dun well will not burn away a lot of coke as the furnace reaches temperature. Start every burn in with the burner in the tap hole. Be patient as it can take a long time. The burn in is not just to light the coke, its also to soak the furnace with heat. Watch the tuyeres and note the color of the coke. When the coke is bright orange or yellow you may turn on the blast and remove the burner. NEVER EVER put iron in the furnace until the coke is too bright to look at with the naked eye. Even then the furnace may need time to soak with heat. If iron is charged to soon it will melt and freeze in the well. The furnace needs to be hot enough to melt iron and hotter to keep it liquid until the tap. During the initial burn in the center of the coke may be yellow and the coke near one or more tuyeres may be cold. The blast can be turned on with the tuyeres open and the burner can be held in the cool tuyere. Do this until all the tuyeres are evenly hot and then close the tuyeres. Start with lower blast volume as to not blow out the fire. In a pinch a furnace can be started with wood or charcoal. Briekets make a lot of ash and it can cause clogging. Hard wood charcoal is preferred, its hotter and isn't so ashy. Burring in with wood or charcoal prevents you from packing the bed so watch out for obstructions in the well and tuyeres. TUYERES Keep them clear and free of slag and coke. If there is glass in them be sure to open them the moment there is no blast air this is less critical with non glass. Also the tuyeres stay open whenever the blast air is off, except for short times during charging and taping etc. Opening the tuyeres prevents the build up of explosive gases. It also prevents the furnace heat from breaking the glass. FLUX About a 1/2 lb to every 100lbs of iron. Bash it small and charge it before the iron. It cleans the iron and helps to remove silica. Flux makes the slag flow and helps later when cleaning out the furnace by making the slag easer to brake out. CHARGE In general the furnace should be charged as soon as there is room to do so, iron then coke. If time is needed between taps just replenish the coke that burns. Often the blast is turned off for charging. Bash the iron small. The largest chunk of iron should be no bigger than the size of a serving spoon. Never try to melt sprew cups or thick things. Cupolas can melt bigger chunks than cupolets. Steel is ok to melt but it needs more heat to melt and is usually only supplementary. TAP The furnace should be taped as fast as is safe. A well-run furnace should be able to be taped with a handspike and a hammer. Also a pointy length of rod is good. When taping, hold the ladle on its side to avoid getting crumbly bot in it as the tap is cleared. Always tap in an upward or level direction to avoid breaching the bottom sand. Never ever tap down ward. Quite often the tap needs to be poked a bit after the iron starts flowing to clear slag and obstructions. BOTOM DROP Lookout it's hot!
What does it mean when our goodman furnace has a blinking light?
circuit board on goodman furnace blicking continously after try to start
3 times fire down led light
How do you change the filter in a Rudd 80 plus furnace?
Pull the old one out and put a new one in Easy. Find it.
What is the code to the furnace in aqw?
it dont have a code just pull up the wooden pin on the right side if the screen and it opens
The oil that is burned by furnaces is mostly #1 or #2 fuel oil
How much coal coke is needed to run a blast furnace for one day?
that would depend on the size of the blast furnace.
How do you start a 1979 gmc vandura furnace?
I have a Frontier Campervan conversion on this vehicle type and can answer for that.
1) Turn on the propane at the tank.
2) Take the front panel off the furnace by pulling the top straight out then lifting.
3) Turn the propane on at the furnace by rotating the red knob 1/2 turn to the ON position.
4) Replace the furnace cover.
5) The wall thermostat has an ON/OFF switch on the bottom. Click it to the ON (right) position.
6) Adjust the temperature using the top slider on the thermostat.
The thermostat should first start the blower then, after a few seconds, start the igniter. I can easily hear the igniter 'tick' as it sparks.
That's all there should be to it.
What size wire is needed for furnace pulling 38 amps?
legally you can use #10 awg wire but I would recommend using #8 awg wire. It would not get as hot as # 10 awg and could carry any overload you could have before the breaker would trip out...The breaker would trip very fast on any overload or shorted circuit before the amperage could affect either size wire but the #8 wire would just stay cooler. #10 AWG can only be fused at 30 amps per the "note" in national electric code (NEC) even though chart shows its ampacity is greater. Therefore, a load of 38 needs the larger wire. In addition if the furnance contains a motor load (usually it does) the motor part must have an extra 25% capacity added to the wire ampacity. So your 38 amp load may actually need wire sized to 40+ amps depending on the motor load. In addition if the ambient temperature of the room is high (like a boiler room) an additional factor probably need to be added. Refer to the charts in NEC
What kind of wood can I use to build a bakery table?
Any kind. But there are a lot of "bad" choices. Use a close-grained hardwood like maple. There are other woods that might work, but they get really expensive. Maple isn't cheap, but hard rock maple is a superb wood for this application. Red oak might work well, too. You'll have some choices as regards "regular" or end grain or side grain when you construct the table. If you haven't tackled any "good sized" projects in wood, this probably isn't a "starter" project. The wood will have to be planed very cleanly to get the best possible finish. This is key. A joiner is not cheap, and the required precision almost precludes a hand planer. If you have a local woodworker's supply store, visit them. If not, hit the library and see if there are any projects like this in the back issues of any of the woodworker's magazines. Certainly you have the web. Good luck.
Can you use off road diesel in your 2001 Ford F-350?
The only difference between "road" diesel and "off-road" diesel is a dye used to tell them apart, chemically they're the same. It's not legal to use "off-road" diesel for road vehicles because road taxes have not been paid on it. Yes the off-road(RED) diesel will work in your truck. Here in California if you are caught running it on the highway ,the first offense is $10,000.00 fine. Keep in mind that off road fuel also does not have some of the additives you would get from a branded fuel at a station. I would add some to keep your injectors and other parts clean and working properly.
What does the led mean when it flashes 3 times on an older goodman furnace?
The flashing LED code should be somewhere, either in the Installation/Operation manual or on the wiring diagram which should be on one of the unit`s cabinet covers or the code maybe right on the circuit board in small type. If not Google the make & model # of your furnace. Or call a service tech.
If you are talking about an oil charged furnace, there are normally instructions on the injector motor or control housing that give you brand specific instructions. If these have been removed, then the next best ting is to ask the fuel delivery driver to prime it for you. They are trained in many types of furnaces and could fix you up in no time. If you must do it your self, there is a "bleeder" that looks like a simple bolt, usually a small one that when loosened, will allow fuel to leak out. In some applications, it may resemble an air inlet like on a tire valvestem and some have a tumbwheel that opens and closes the valve. Make sure you have a coffee can or something that can collect the drain off fuel. Locate the emergency shut-off valve so you know where its at. Most systems have two. one located far away from the furnace for safety, and one right at the furnace. Locate the control box. It is normally located with in close proximity to the pump motor. (it will be the only box with wires going into it) On the control box, you should see a small "reset button" it may be labled "primer" Loosen the "bleeder" and press the reset button. (The pump will start, so be prepared. It may startle you!) Some require you to hold the reset down while others just need to be presses once. (you can test this to determine which one you have by simply pressing and depressing to see if it stays running) Now, while its running, keep an eye on the bleeder. You will see a little oil seeping out and a pop or two from air escaping, maybe even a few bubbles. (At this point, all you are trying to do is allow the oil in the tank to replace the air in the line. ) Now depending on the distance from the tank to the furnace will determoine how fast the oil fills the line. It may do it quickly (one reset cycle) or it may take a few minutes. If your line is say, 25 feet long, then the pump may shut off after 5 minutes. (a safety installed into the system so you don't burn out the motor and pump impelers. The oil acts as a lubricant for the pump parts.) If you are still getting nothing or seeping with pops and bubbles, repress the reset again. (you may have to wait 5 minutes for the restet to work. another safety) Now, after the wait, reset and watch the oil drip. You want a steady hard stream of oil out of the bleeder. Now, another thing to watch, or listen for is that the reset, under normal use, starts the ignitor too. if there is substancial pressure at the injector, the furnace will start to burn. In this case, shut the bleeder, you are done. Stay there for a few minuts just incase it was a fluke. It may stop if there was a short burst of fuel, and air followed it. I am sure by now, you get the idea. If the furnace doesn't start after three resets, call the repair man.
What is a mortuary furnace called?
If you're referring to cremation, the apparatus is called a Retort.
