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Does condensate return need to go through a flash tank prior to a DA tank for a steam boiler system?
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Why is the boiler water circulating pump required for EGB?
I think because it works more like a heat exchanger taking heat from the exhaust gas, rather than a "standard" boiler with a furnace?An EGB needs a pump to circulate the water through the pipes in the exhaust stack, whereas a furnace-heated boiler can use convection to move the fluid through the system..?Might have something to do with lower temperatures in an EGB?
What is the inlet pressure of a condensate tank?
It can be at any pressure less than the main steam pressure. I've operated steam systems with condensate tanks at widely varying pressures. The pressure a condensate tank, (which condenses some steam, but typically takes returns from steam traps) is wholly dependent on the system is installed in. Some heating system condensate tanks are designed to handle no more than 30 psig (minimum design requirement) yet take condensate at 1 or 2 psi from the steam traps. Other high pressure production lines operating at 50 - 100 psig could discharge to a tank at 50 - 100 psi, though the actual pressure would be reduced by the length of pipe transferring it to the tank. And the highest pressure I've operated a condensate system at was 600 psig, the steam system drew the steam for process from an extraction stage on the turbine at nominally 600 psi, though at low loads it was typically a much lower pressure.
What are the common oxygen scavengers used for boiler water?
There is a chemical called Carbohydrazide which is used in boiler water. Carbohydrazide is a volatile oxygen scavenger, contributes no solids to the system, reacts readily with oxygen at low temperatures and pressures, and passivates the metal of the boiler system. Carbohydrazide cannot be used in applications where the steam comes into contact with food.
Why do you inject oxygen scavenger in boiler feed water?
Oxygen is a highly reactive gaseous element. In the presence of steel, the corrosion rate of oxygen doubles for each 30°F rise in temperature. For example, in a boiler system operating at 400 psig and 444°F, the corrosion rate for oxygen is 256 times more reactive than at room temperature. Sodium sulfite is a highly effective oxygen scavenger Erythorbate, Diethyl hydroxylamine, Methyl Ethyl Ketoxime, Carbohydrazide and Hydroquinone are other alternatives.
How is hydro refined?
Hydor is refined by using the water that is run through dams and is put through a system that takes the power electricity from the water and sends it out to all the people who are watching t .v or something like that.
In a two pipe system condensate is normally returned to the boiler by?
If its a large steam system which I am assumeing,then a pump or pumps.
Why is it desirable to return as much condensate to the boiler as passible?
In order to assure that the boiler has enough make up water to continue w/ normal operations w/ out having to introduce new water to the system that would bring in additional air and impurities that would be harmful to the system.
Is boiler a closed system?
A boiler can be a closed system if you include the pipes it is connected to, but usually there are relief valves that will allow the escape of steam to protect against excess pressure and inlets that will allow adding liquid to the boiler to make up for fluid lost from the pressure valves. Also most boilers are imperfectly sealed so they leak a little bit. If you do not consider the attached piping, then a boiler would not be considered a closed system since it would be constantly sending out steam and receiving condensate in return.
How do close formula feeds differ from open formula feeds?
The feed system cycles between boiler and turbine and enables the steam to return to the boiler as feed water. A closed feed cycles a main propulsion steam run turbine through a high pressure water tube boiler. The condenser, set to a high vacuum, will receive the steam turbine exhaust.
How do close formula feeds differ from open feeds?
The feed system cycles between boiler and turbine and enables the steam to return to the boiler as feed water. A closed feed cycles a main propulsion steam run turbine through a high pressure water tube boiler. The condenser, set to a high vacuum, will receive the steam turbine exhaust.
What are the two chemical used to prevent corrosion in condensate return lines and explain how they provide protection?
There are two different materials on the market today which are being used with good results. These are the neutralizing amines, and the filming amines. The neutralizing amines are volatile alkaline materials. They are primarily effective against carbon dioxide corrosion, but have very little value in combating oxygen corrosion. In your raw water are naturally occurring bicarbonates. As these pass through the heater and into the boiler they are converted to caustic soda. Carbon dioxide gas is given off as a result of this conversion and it passes out of the boiler with the steam. Carbon dioxide is an acid and it dissolves in the condensate as it is formed. This lowers the pH of the condensate to a point where actual acid attack of the pipe occurs. The neutralizing amines simply neutralize this acid. If soda ash is used for boiler water treatment it too breaks down in the boiler to form caustic soda and carbon dioxide. This simply increases the corrosion problem, and, if you are using a neutralizing amine it increases your cost. Inasmuch as caustic soda is already reverted to the final pro- duct, no carbon dioxide is given off in the boiler. This is of course the ad- vantage of caustic over soda ash. Filming amines actually protect the pipe by forming a thin, non-wetable coating on the surface. This separates the pipe from the corrosive condensate and offers excellent protection from both carbon dioxide and/or oxygen corrosion. The filming amines represent a far better material in almost every case. Not only do they provide better protection, they usually cost less as well! The filming amines cannot be mixed with other chemicals, and pure condensate must be used to prepare the feeding solution. However, the filming amines can be fed to the boiler by means of the boiler feed water. it is not necessary to feed it into the steam line. The filming amines have a strong affinity for iron. Therefore they will clean off all of the corrosion products, dirt, and oil that might be inside your condensate return system. This may give some trouble with plugged traps and strainers until the system is cleaned out.
He boiler or system boiler - What is the difference?
He = ASME = heating
How to add water to hot water heating system with radiators?
Normally through an automatic feeder preset 12-15 psiIdeally you want a slow feed so as not to thermo shock the boiler and cause premature failure.=Most make up water is supplied on the return side of the boiler to temper the incoming water=
How do you calculate 25 bar steam condenstate pressure?
If the steam pressure is 25 bars the condensate pressure is at most 25 bars. Typically it is slightly less due to friction of the fluid passing through the steam traps. As the condensate approaches the condensate tank, where it is normally vented to atmosphere, the pressure decreases in the system to near atmospheric.
Why you use the steam trap to separate any liquid content?
Steam traps help out in a couple of ways: Where steam is being passed through a turbine, entrained liquid droplets could cause problems when the impact the blades of the turbine. Where steam is being used to heat something, the liquid has already lost the heat of vaporization, so it is not worth transporting for heating purposes.
Can you incorporate a solid fuel back boiler into a pressure water system it would be nice not to have to use so much oil and take advatage of our wood burning stove?
Yes, If it is a pressurized system, the water from the back boiler and your oil or gas fired boiler can be mixed. This can also be achieved by using a water to water plate exchanger to preheat the return water from your heating devices. If you have a forced air heating system in the house, a coil can be placed in the main trunk line of the duct work and heated by circulated water from the back boiler.
What is a back boiler?
A back boiler is a boiler which supplies a central heating and hot water system and is fitted into the recess of a fireplace.
