Seamless Steam Reheater , Water Reheater Gas Fired Boiler Pipes High Pressure

High Quality Seamless Gas-fired Boiler Super heater And Re heater steam pipes

High Quality Seamless Reheater

1. As the name suggests reheater, it reheat the steam so that the temperature can be raised further and work done by IPT can be increased

2. generally after high pressure turbine the exhaust pressure and temperature will be 33–35kg/cm2 and 340–345degree C

So in order to increase the temperature of HP exhaust it is sent to reheater ,so flue gas passing over the tubes makes the steam to attain the temp back around 530–540degree C.

3. Now based on boiler design the reheater placement is decided ,for PF boiler it's between first pass and second pass of boiler and in cfbc rehater section is completely in 1 St section of second pass boiler

Reheater Function

1. Therefore the number of reheat stages can not be many as the pressure drop will reduce efficiency of thermal cycle.The steam pipes and reheater coils are to be so designed to limit the drop to 2–3%.

2. The control valves in reheat steam path is not desirable.Systems using HP LP bypass require these valves to control steam flow during bypass operation.

3. The efficiency of the Reheat cycle can be improved by increasing the pressure and temperature of steam entering into the turbine. As the initial pressure increases the expansion ratio of the turbine also increases and the steam becomes quite wet at the end of expansion.

Main Advantage

The main advantage of reheat cycle is to reduce the specific consumption and consequently reduce the size of the boiler and other auxilaries for the same power.The reheat cycle is preffered for the high capacity above 100 MW plant.

Differences

Ball through

Iron Frame Package