Problems With Low Vacuum in Condenser

It depends upon what the condenser is doing, which isn't stated in the post.

Low vacuum i.e high absolute pressure in the condenser will deteriorate the performance. Overall efficiency will reduce, More heat will lost in condenser. low vacuum means high exhaust hood temperature, for which last blades are not designed.

Dear sir..!!

plz tell me what to do when the low vacuum problem persists in a 250MW or 500MW thermal plant.

Your issue is “If we use low vacuum in condenser what will be the problem?”

I think you are referring to a Power Plant. If it is so, low vac. means the heat drop per Kg. of Steam will be less – Refer Mollier Chart or steam tables and for the same load, the steam consumption will go up. If the steam supply or flow is not increased, the inlet steam pressure at turbine will fall down forcing the load to be reduced.

If it is a process system, where boiling is the function, the evaporation rate will fall down since the boiling temp. of the fluid will increase and over-all evaporation rate will fall down.

DHAYANANDHAN.S