Does steam temperature increase with pressure?

The higher the pressure of a boiler the more heat must be applied to make steam. With the increased pressure, you in turn get steam at higher temperatures.

What is the effect of decrease of reheat pressure on the quality of steam at turbine exhaust?

What is the effect of decrease of reheat pressure on the quality of steam at turbine exhaust? Explanation: For too low a reheat pressure, the exhaust steam may even be in the superheated state which isn’t good.

What happens to steam temperature when pressure is reduced?

Energy Saving by Increase of Latent Heat by Pressure Reduction. For saturated steam, the higher the pressure is, the smaller the latent heat which the steam contains become, and the larger the sensible heat become. This means that, the higher pressure, the larger the heat quantity loss for using for indirect heating.

Does superheating increase pressure?

However, with superheated steam there is no direct relationship between temperature and pressure. Therefore at a particular pressure it may be possible for superheated steam to exist at a wide range of temperatures. In general, saturated steam tables give gauge pressure, superheated steam tables give absolute pressure.

How does steam create high pressure?

Steam can be produced by burning fossil fuels such as natural gas, and releasing their chemical energy to heat the high-pressure liquid in the boiler tubes (water wall tubes, risers, down-comers, superheaters, and economizers).

What happens to steam at high pressure?

At atmospheric pressure the saturation temperature is 100°C. However, if the pressure is increased, this will allow the addition of more heat and an increase in temperature without a change of phase. Therefore, increasing the pressure effectively increases both the enthalpy of water, and the saturation temperature.

What is the effect of reheat on steam quality A increases?

Explanation: Reheat increases work output.

What is the effect of reheat in steam quality?

The quality of steam at the exit of the turbine is improved by reheating i.e. x 4s > x 4’s, so blade erosion reduces because water droplets in exhaust become less. It may also be noted that as the reheat pressure decreases, the quality of steam in a turbine exhaust (x 4) increases.

Why does latent heat of steam decreases with increase in pressure?

With the increase in pressure the boiling point of the liquid increases and a lesser amount of energy needed to overcome the intermolecular force thus the latent heat of steam required is decreased.

What is the effect of reheat on steam quality?

Why temperature of steam increase during the superheating while its pressure remains constant?

If the pressure remains constant, adding more heat does not cause the temperature to rise any further but causes the water to form saturated steam. The temperature of the boiling water and saturated steam within the same system is the same, but the heat energy per unit mass is much greater in the steam.

Is used in boiler to increase the Temerature of steam without increasing pressure?

An economiser is used to increase the temperature of saturated steam without raising its pressure.

When should a reheat steam cycle be used?

When the customer economics allow, a reheat steam cycle may be employed. This frees up thermal cycle design space as related to maximum steam pressure because exhaust moisture is no longer a design constraint. Modern high-efficiency GTCCs typically employ three pressure reheat steam cycles operating at ~17 MPa and 565–600°C.

What is the effect of superheating the steam to a high temperature?

The effect of superheating the steam to a high temperature on the Rankine cycle efficiency is illustrated on a T-s diagram on the left. By superheating the stream to a high temperature (from state 3 to state 3′), the average steam temperature during heat addition can be increased.

Does reheating improve the efficiency of a steam turbine?

The main purpose of reheating is to avoid excess moisture in steam at the end of expansion to protect the turbine. But it need not improve the cycle efficiency. That will depend (as Dmitri said) upon whether the mean temperature of reheat addition is > or < the mean temperature of heat addition before reheat.

What happens when steam is heated in a closed system?

Steam behaves like an ideal gas so when it is heated it either expands inside the container or the pressure increases. Basically the steam pushes itself out of the boiler and it goes to where its needed. But if the steam were inside a closed system then the pressure would increase in proportion to the temperature increase.