Amr Ali 33 said:i know that regeneration is heating the feed water by the bled steam from the turbine to reduce the sensible heat addition by the boiler but doesn't that also causes a reduction in the steam turbine work because we've taken some steam from it .
can anyone explain please i'may have some misunderstanding
Regeneration in a steam cycle is the process of preheating the feed water using the waste heat from the turbine exhaust. This helps to increase the efficiency of the steam cycle by reducing the amount of fuel needed to produce steam.
In a steam cycle, the feed water enters the feed water heaters, where it is heated by the waste heat from the turbine exhaust. The heated feed water then enters the boiler, where it is further heated to produce steam. This process reduces the temperature difference between the boiler and the condenser, resulting in lower energy losses and increased efficiency.
The main benefit of regeneration in a steam cycle is increased efficiency. By preheating the feed water, less energy is required to produce steam, resulting in lower fuel consumption and cost. Regeneration also helps to reduce wear and tear on equipment, as well as emissions and environmental impact.
The two main types of feed water heaters used in regeneration are open and closed heaters. Open heaters allow the feed water to mix with steam from the turbine before entering the boiler, while closed heaters keep the feed water and steam separate. Other types include deaerating heaters, which remove oxygen from the feed water, and low-pressure heaters, which use the condensate from the turbine to preheat the feed water.
The effectiveness of regeneration is measured by the amount of heat transferred from the steam to the feed water, also known as the heat transfer effectiveness. This is typically expressed as a percentage and can be calculated by dividing the actual heat transfer by the maximum possible heat transfer. A higher heat transfer effectiveness indicates a more efficient regeneration process.