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What else can I help you with?
HOW OFTEN Should you blow down a boiler?
ANSWER: If it's a steam boiler: Once a month. If it's a forced hot water boiler-You don't have to. You'll only be adding more air into the system causing more noise.
Why is the steam pressure coming out of the boiler low?
Depends on the situation! It may be needed at only a low pressure. Otherwise it may be the result of reduced heat input or of the input of cold feed-water.
A design of a typical steam boiler for electric power generation?
In a Power generating plant, steam is produced in a boiler. The boiler is effectively a huge kettle. Generally a boiler has the following subassembly layout: high pressure water flow (>200 bar g, >250 DEG C) enters the economizer inlet headers and then thru the economizer heat exchange pipes to arive in the economizer outlet headers. Main role of the economizer is heat up the water. After the economizer the water runs thru the headers and heat exchange pipes of the evaporator. Here the water vaporizes in to steam. Steam then runs through the headers and heat exchange pipes of generally 2 - 3 superheaters. Between superheaters and after the last superheater is a water injection point to control the temperature of the superheated steam. This layout would be in case of drum boiler, used in small power plants (electric power output not more then 100MW). Now the drum is large barell on top of the boiler where water and steam are separated. In case of large MW rated power plants the boiled does not have a drum. I must also say that when a boiler has a drum it is called a multiple pass boiler. That means that water is circulated through the vaporizer in 2,3 or more cycles until is fully transformed in to steam. In case of large MW rated power plants water passes through the vaporizer only one time and is fully transformed in to steam. This type of boilers are called " once through" boilers or "Benson" type after the name of the inventor. Now to have a view about the actual layout of the heat exchange surfaces here are some facts : - furnace, wih burners, is place where the flame or fire is located. Here temperature is very high ( >900DEG C). Heat surfaces are superheaters. Main heat exchange is done through radiation. Professionals calls this heat exchanger as radiation superheater. - convective superheaters. Called like this because heat exchange is particularly by convective means. The flue gases are cooler here and this is an array of pipes that the flue gases washes them. As I mentioned earlier it can be 2-3 convective superheaters. Steam that comes out from superheaters is run through pipes to the turbine inlet valves. In large MW rated power plants, steam that comes out from the high pressure turbine body is reheated in the boiler. Reheaters are also heat exchange surfaces that are generally intercalated with the superheaters. After reheating the steam is run to the intermediate pressure turbine body. To continue with the heat exchange surfaces layout in boiler, flue gases after washing the superheaters and/or reheaters will wash the evaporator and then the economizer before actually exiting the boiler body. To recover as much heat from the flue gases, after exiting the boiler, flue gases are run through a rotarry or tube heat exchanger. Here, air that is fed to the burners is heted. This way remanent heat of the flue gases is put back in to boiler making it more efficient. So to summarize a boiler is made of ( in order of flue gases pass) : - furnace (radiation superheater, pipes are run by high pressure steam) - convective superheaters ( pipes are run by high pressure steam) - evaporator (pipes are run by a mixture of water and steam) - economizer ( pipes are run by water ) Unlike a huge kettle, modern boilers use tubes filled with water and steam. Contained within a furnace.
Why mostly steam is used to rotate a turbine?
The Rankine cycle is one where a closed loop containing water/steam is used to transfer energy from an energy source such as a coal fired furnace or a nuclear reactor to a steam turbine/generator. It is the way all such power plants work, but not plants using gas turbines or combustion turbines which don't use a water/steam circuit. In the Rankine cycle there are progressive stages: 1. Cool feedwater is pumped at high pressure into a boiler which is heated by the furnace or nuclear reactor 2. The water is heated and evaporated at high pressure, becoming steam 3. The steam is further heated to become superheated 4. The steam is admitted to the HP end of the steam turbine, and it progresses in stages to the LP end by which time it is cooled and under vacuum (the vacuum is maintained by external cooling water and increases the efficiency considerably by getting the maximum energy out of the steam) 5. The steam condenses in the turbine condenser under vacuum, to produce cool water, and hence back to stage 1. Electrical energy is extracted by the generator which is coupled to the shaft of the turbine, but that is not really part of the Rankine cycle, which is described in thermodynamic terms only. See link below for more reading and diagrams.
How DM plant are design?
Since there is continuous withdrawal of steam and continuous return of condensate to the boiler, losses due to blowdown and leakages have to be made up to maintain a desired water level in the boiler steam drum. For this, continuous make-up water is added to the boiler water system. Impurities in the raw water input to the plant generally consist of calcium and magnesium salts which impart hardness to the water. Hardness in the make-up water to the boiler will form deposits on the tube water surfaces which will lead to overheating and failure of the tubes. Thus, the salts have to be removed from the water, and that is done by a water demineralising treatment plant (DM). A DM plant generally consists of cation, anion, and mixed bed exchangers. Any ions in the final water from this process consist essentially of hydrogen ions and hydroxide ions, which recombine to form pure water. Very pure DM water becomes highly corrosive once it absorbs oxygen from the atmosphere because of its very high affinity for oxygen. The capacity of the DM plant is dictated by the type and quantity of salts in the raw water input. However, some storage is essential as the DM plant may be down for maintenance. For this purpose, a storage tank is installed from which DM water is continuously withdrawn for boiler make-up. The storage tank for DM water is made from materials not affected by corrosive water, such as PVC. The piping and valves are generally of stainless steel. Sometimes, a steam blanketing arrangement or stainless steel doughnut float is provided on top of the water in the tank to avoid contact with air. DM water make-up is generally added at the steam space of the surface condenser (i.e., the vacuum side). This arrangement not only sprays the water but also DM water gets deaerated, with the dissolved gases being removed by an air ejector attached to the condenser.
How do trains run on coal?
Only (some) steam engines used coal. It was burnt in a boiler to heat water to steam.
What is the difference between a steam boiler and steam generator?
boiler use many type of working fluids like water, Mercury, liquid sodium, etc., but steam generator works only with water as working fluid. hence all steam generator are boilers but all boilers are not steam generators...
What is the difference between a hot water generator and steam boiler?
boiler use many type of working fluids like water, mercury, liquid sodium, etc., but steam generator works only with water as working fluid. hence all steam generator are boilers but all boilers are not steam generators...
HOW OFTEN Should you blow down a boiler?
ANSWER: If it's a steam boiler: Once a month. If it's a forced hot water boiler-You don't have to. You'll only be adding more air into the system causing more noise.
Why is to safety valve mounted on boiler drum?
the safety valve is mounted on the top of drum because, if the water level in boiler decreases a certain value, the temperature gets increased in water drum because of lack of water. So, increase in temperature result in high pressure in steam drum, as the safety valve is designed to withstand a certain pressure, after a cetain pressure, the safety valve is removed by high pressure of steam. this is why the safety valve is mounted on top of boiler drum. +++ Shall we sort out that lot? That answer is wrong. Its only link with water-level is that the valve has to be above the water anyway. If the boiler runs dry the safety-valve will not protect it. The safety-valve is there to prevent the steam pressure rising to a potentially a dangerous level. It is set to open at the boiler's designed working pressure.
What is the function of anti-priming device in boilers?
The anti-priming device in boilers is designed to prevent the carryover of water into the steam system. It helps to ensure that only steam, and not water droplets, is delivered to the steam lines, which can lead to efficiency losses and potential damage to equipment. By maintaining proper water levels and controlling the steam quality, the device enhances the overall performance and safety of the boiler system.
Why is the steam pressure coming out of the boiler low?
Depends on the situation! It may be needed at only a low pressure. Otherwise it may be the result of reduced heat input or of the input of cold feed-water.
What is the medical benefits to using steam mops?
Steam mops are only used cleaning floors. They provide benefits, by using a steam boiler system. The steam generated by these mops loosens dirt and greese, and absorbs them into the pad on the mop.
How much wood is required to generate 1 ton of steam?
Near to 400 pounds.One pound of steam requires the input of 1080 btus of heat added to 32oF water at atmospheric pressure. One ton or 2000 pounds requires the input of 2.16 million btus, and a boiler with 80% efficiency (common value) will need 2.7 million btus of heat from the combustion of the wood. Assuming the wood has a btu heat content of 6500 btu/lb (commonly most woods are 6000 to 7000 btu/lb) then about 415 pounds of wood are required to produce 1 ton of steam. In practice only 375 pounds of wood are needed to maintain a steady output of one ton of steam in a boiler, as the water when reintroduced into the boiler is very close to the steaming temperature and doesn't need to be heated from 32oF.
Why was water running in boiler when thermostat off?
The thermostat controls only the temperature of the water.
Where does the water used to make steam in a power plant come from?
It is initially just normal mains water, but then it is purified by a demineralisation plant, so that water turning to steam does not leave deposits in the steam raising units or in the reactor in the case of a BWR. The steam is condensed to water after going through the turbine, and then recirculates, so the water makeup only has to replace loses due to leakage.
What can you make with only water?
Ice, or steam
