Steam Turbine

yes you can.

thanks, what steps we required for this conversion? can you help us regarding detail and any reference?

Contact the original equipment manufacturer for advice. Early.

Dear aliqillani,

Unfortunately turbines are very sensitive to their operating conditions especially with respect to the exit pressure;trying to run this turbine into a vacuum will not be efficient as the blading on the 'LP section' is not intended for working in such low density steam. The effect within the casing will therefore be to try and accelerate the steam velocity in the preceding stages of blading with a potential loss in power as the system becomes choked; thereby limiting the through put.

The relationship between velocity change per stage due to a designed pressure drop and an ad hoc change as you propose can therefore prove to be counter productive.

If you wish to leave things as they are, in terms of the exit conditions on the turbine and take the 2 Barg steam straight to the condenser then you will avoid the problem but suffer the increased loss in overall cycle efficiency. To achieve a constant exit pressure will require a load sensitive PRV set-up in order to keep the turbine discharge at a positive pressure at all times.

Contacting the manufacturer will elicit similar reactions with the probable suggestion that you buy another turbine.

Best wishes,

Massey

ok, my main problem is not condensing, my problem is to arrange condensate water for boilers, are we arrange condenser for exhaust steam? what the type of condenser we use?

If you just want to recover the condensate- and are not worried about capturing any of the thermal value- a simple large coil- likely steel tube and steel fins- in the end of the exhaust pipe discharge connected to a cooling tower will provide you with condensate that is cool enough to pump easily without losses from flash steam.

Another, similar, approach is to put several vertical pipes between two larger headers (top and bottom) spaced with about one inch of space between them. Install at least 2 of these (3 would be better)- with the downstream coil mounted so its tubes are centered on the spacing of the prior coil. Pipe all headers together into a master header and feed with the coolest water in the bottom and the warmer water in the top.

Install a receiving drain pan below the coils with a level actuated pump that feeds the condensate return tank.

Hi aligillani,

The choice of condenser will be determined by quantity of condensate required by the boiler, therefore please advise on the boiler rating or feedwater throughput as currently mtered.

Massey.

Massey's point is well-said. If you do not "need" the 2 Bar steam in any current process, install a second turbine (rated for condensing action) using the 2 Bar inlet pressure and use the coldest water you can for the condenser. The outlet temperature of the water can easily be 100 C or higher. Size the water flow for the total thermal gradient- saturated steam at 2 Bar to condensed water at, say, 5 C using cold domestic water as the heat sink.

Remember that the latent heat will be from the saturated steam to the 5 C condition in addition to the sensible heat of all the through-put PPH of steam from133-134 C to 5 C.

If the turbine manufacturers have a problem with that condition, consider using the exhaust steam to flash vaporize an organic refirgerant that is sit up to drive a turbine and be condensed downstream- using the same coolant water that ou had envisioned earlier- or using an air-cooled condenser if you have no use for the thermal value. The refrigerant will allow much higher pressures to drive the turbine and you will still get the value of the full thermal (latent and sensibel) from the refrigerant energy transfer.