0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
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.
Will the steam power plant works without condenser?
no
Why you keep condenser rupture disc in steam turbine?
You want the rupture disk located at the LP exhust side of the steam turbine. This is placed here to prevent over pressure of the condencer in case loss of vacuum occurs. It is not placed in the condencer because the condencer is not rated for pressure.
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).
How does steam condenser work?
the work of the condensor is to condense the hot steam and change its state so that it can be used again in boiler
Using a diagram briefly explain the layout and functioning of a nuclear power station In your answer refer to the three separate water circuits?
The three water circuits in the nuclear plant are the primary coolant, the secondary or main steam circuit, and the tertiary or condenser cooling system. Below is link to a fairly clear diagram that has all three water circuits in it. Look at the diagram as we give you the scoop one loop at a time. Primary coolant is circulated (forced by the main coolant pumps) through the reactor core to pick up heat. This hot primary coolant is circulated through that steam generator where it boils secondary water to create steam. The primary coolant leaves the steam generator cooler than when it went in (but still hot!), and then returns to the reactor's pressure vessel (where the reactor core is housed) to be reheated. It's a closed loop. In the secondary or main steam system, the feedwater turns to steam in the steam generator. It then leaves that steam generator and goes through the main steam header to the big steam turbines that drive the electric generators. In the main condenser below the steam turbine, the steam condenses back into water as the condenser cooling water circulates through the condenser. The water that used to be steam is now feedwater, and it's pumped back into the steam generator to begin the steam cycle again. The condenser cooling water that cooled the exhaust steam to convert it back to water is pumped out into a heat exchanger (evaporative cooling tower). Thus cooled there, the main condenser cooling water is pumped back into the main condenser to remove heat from the exhaust steam to convert it back to water. This completes the main condenser cooling cycle. A link below will lead you to a fairly clear diagram with the three cooling circuits in it. With a bit of jumping between the explanation and the diagram, you should be able to see everything clearly.
Why the vacuum is maintained in Steam condenser?
It is important to maintain a vacuum in a condenser if you want it to work well.
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 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.
How do you separate hydrogen from steam?
condenser or membrane
Why does the largest heat loss occur in a condenser in regard to steam?
heat losses in condenser in percentage
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.
Will the steam power plant works without condenser?
no
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.
How the steam changes back into a liquid inside the condenser?
The steam when cooled changes back to liquid water
Why you keep condenser rupture disc in steam turbine?
You want the rupture disk located at the LP exhust side of the steam turbine. This is placed here to prevent over pressure of the condencer in case loss of vacuum occurs. It is not placed in the condencer because the condencer is not rated for pressure.
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).
