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It is important to maintain a vacuum in a condenser if you want it to work well.
Jadyn Sporer
Wiki User
∙ 13y agoFor increasing steam turbine efficiency.
if vacuum is not maintained then, uncondensable gases and air in condenser will increase the condenser pressure.
Wiki User
∙ 11y agoTo draw as much workable heat energy out of the steam as possible, by allowing the maximum amount of expansion of the steam as possible.
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What is kenotometer?
A kenotometer is an instrument used in steam turbine condensers to measure the vacuum in the steam space of the condenser. The vacuum achieved by the condenser has significant influence on the efficiency of the steam turbine.
How to design a steam turbine?
-Check turbo generator lube oil sump level and drain it for water. Replenish it if level is less than normal. -Start the lube oil priming pump from the local station and check the lube oil pressure. Put the priming pump on auto. -Check and fill up the Turbine Generator vacuum pump operating water tank to normal level. -Check vacuum condenser condensate level from the condensate pump. Put the pump on auto so that the level is maintained all the time. -Operate the steam drain valve to drain any condensed water from the steam line to avoid excessive hammering and vibration while starting turbo generator. -Open the main steam inlet valve for turbo generator. -Adjust the gland steam pressure to normal level. -Check and open the sea water valves for vacuum pump cooler, T/G lube oil cooler and vacuum condenser are opened. -Start the vacuum pump and bring up the vacuum in the condenser. -Open condensate pump valves and switch on the pump. -Check whether the condensate vacuum, gland steam pressure, steam inlet pressure, and lube oil pressure are normal. -Start turbo generator from the local station and close the drain in the steam line. -Check first and second stage steam pressure. -Check condenser vacuum and water level. -Check lube oil pressure and vibration levels. -Check turbo generator speed, voltage, frequency, vacuum, condenser level and other parameters. -Give control to remote station from the local control and take the TG on load.
Why does the largest heat loss occur in a condenser in regard to steam?
heat losses in condenser in percentage
What is purpose of using Intermediate and Low pressure turbines in a thermal power station?
To obtain as much mechanical energy from the steam produced in the plant's steam raising units as possible, it is expanded through increasing sized turbine wheels, eventually expanding into a vacuum in the turbine condenser before condensing and returning to the steam cycle.
What is the working principle of steam jet ejector?
it is not based on bunoullies theorem it is based on mach number.when sonic speed of steam converted to supersonic steam by nozzle vacuum is created.
Why the vacuum is maintained in condenser?
For increasing steam turbine efficiency. if vacuum is not maintained then, uncondensable gases and air in condenser will increase the condenser pressure.
What should be the possible reasons of vacuum drop of turbine?
In the low pressure side of a steam turbine, the vacuum is maintained by the condensation of steam in the condenser. At high loads, the condenser may not satisify the demand, allowing steam to remain gaseous for a longer period of time. This can cause pressure to rise.
What is kenotometer?
A kenotometer is an instrument used in steam turbine condensers to measure the vacuum in the steam space of the condenser. The vacuum achieved by the condenser has significant influence on the efficiency of the steam turbine.
Why is vacuum in the condenser of such importance?
If you are talking about a condenser attached to a steam turbine, then a vacuum is important because it extends the usefulness of the steam in the turbine. As you probably know, steam begins to condense back into water at 212 deg at atmospheric pressure. However, in a vacuum condition, the boiling and condensing temperature is lower. Because the condenser is under a vacuum, steam exits the turbine and enters the condenser around 130 deg. This results in more power (mega watts).
Why used hogger and ejector in steam turbine?
A steam turbine condenser equipped with ejectors is usually fitted with two ejectors. The larger of the two is called the hogger and the smaller the huffer. Steam turbines are designed for efficiency and thus attempt to extract as much energy from the steam passing thru as is physically possible. Energy is extracted as both temperature and pressure decrease. The lower the temperature and pressure at the steam turbine's exhaust the more energy can be extracted from the steam. For this reason it is desirable for the steam turbine condenser (the exhaust) to be at the lowest temperature and pressure possible. The hogger, or hogging jet, is a large steam powered ejector that causes the steam condenser to operate under a near perfect vacuum whilst the steam turbine is in the start-up phase. In steady state operation the cooling effect of the condenser cooling water of the steam causes the condenser to operate under a nearly self sustained vacuum. The hogger is necessary in the start-up phase to prevent steam from condensing to water in the final stages of the turbine before the steam flow and cooling effect of the condenser can establish vacuum. The huffer or huffing jet runs continuously whilst the turbine is operating to remove any non-condensable gasses (i.e. air) that might leak into the condenser. It is nearly impossible to perfectly seal a condenser and turbine from air-in leakage. It should be noted that modern, large steam turbines do not employ steam ejectors to establish and maintain condenser vacuum. Modern designs utilize motor driven mechanical vacuum pumps.
What is the use of vacuum pump in thermal power plant?
A vacuum pump is used to expel air and non-condensible gases from the condenser in order to allow it to continue accepting steam (the collapse of which produces the vacuum in a condenser). If the vacuum pump fails, it will take from seconds to a few minutes before enough non-condensible gases build up in the condenser to stop the flow of steam. The non-condensible gases come from the boiler feedwater supply, despite the fact that boiler water is treated to prevent this. The minute amount of air in the water is carried with the steam into the turbine then the condenser where it will concentrate unless removed by the vacuum pump.
What is Difference between vacuum condenser and atmospheric condenser?
An atmospheric condenser operates naturally at atmospheric pressure (1.013bar). A vacuum condenser operates at pressures below atmospheric and will use some sort of pump to provide a vacuum.
Why there is tripping given in vacuum in thermal power station?
Generally the condenser in the power plants are designed to operate under vacuum. The specific volume of the steam is relatively higher than water. The steam coming from the exhaust of the turbine is cooled by the circulating water and the non combustibles are removed by the air removing equipment like ejectors or vacuum pumps. In case these equipment fail condensation of steam fails and it tries to occupy more volume. As the space in the condenser is limited it is pressurized and failure would happen. More over once the condenser is pressurized the flow through the turbine is reduced considerably which leads to churning of steam in the turbine which ultimately heats the turbine blades leading to failure. Hence a tripping of turbine is introduced which cuts of steam flow into the turbine and the condenser.
What is the function of gland steam in steam turbines?
Gland steam is steam supplied to the labyrinth glands of the low pressure turbine to prevent air entering in the exhaust side, which disturbs the vacuum (± 50 mbar absolute) in the condenser. Gland steam pressure is to supply at about 0,2 bar.
What is the function of the gland steam in steam turbine?
Gland steam is steam supplied to the labyrinth glands of the low pressure turbine to prevent air entering in the exhaust side, which disturbs the vacuum (± 50 mbar absolute) in the condenser. Gland steam pressure is to supply at about 0,2 bar.
How to design a steam turbine?
-Check turbo generator lube oil sump level and drain it for water. Replenish it if level is less than normal. -Start the lube oil priming pump from the local station and check the lube oil pressure. Put the priming pump on auto. -Check and fill up the Turbine Generator vacuum pump operating water tank to normal level. -Check vacuum condenser condensate level from the condensate pump. Put the pump on auto so that the level is maintained all the time. -Operate the steam drain valve to drain any condensed water from the steam line to avoid excessive hammering and vibration while starting turbo generator. -Open the main steam inlet valve for turbo generator. -Adjust the gland steam pressure to normal level. -Check and open the sea water valves for vacuum pump cooler, T/G lube oil cooler and vacuum condenser are opened. -Start the vacuum pump and bring up the vacuum in the condenser. -Open condensate pump valves and switch on the pump. -Check whether the condensate vacuum, gland steam pressure, steam inlet pressure, and lube oil pressure are normal. -Start turbo generator from the local station and close the drain in the steam line. -Check first and second stage steam pressure. -Check condenser vacuum and water level. -Check lube oil pressure and vibration levels. -Check turbo generator speed, voltage, frequency, vacuum, condenser level and other parameters. -Give control to remote station from the local control and take the TG on load.
What is the role of gland condenser in steam turbine?
gland condenser is a type of condenser in which steam which is coming from d turbine is used for the heating of demineralised water and then this water is sent to the boiler so boiling of hot water consumes less coal and thus we get benifit of it
