Question 171Steam Plants - Assistant Engineer

The correct answer is A) air ejector condensate discharge. The automatic recirculating valve in the main condensate recirculating line is controlled by a temperature sensor located at the air ejector condensate discharge. This is because the temperature at the air ejector condensate discharge is a good indicator of the performance of the main condenser. If the temperature at this point is too high, it suggests that the main condenser is not effectively condensing the steam, and the recirculating valve needs to open to maintain the proper temperature and flow in the condensate system. The other options are incorrect because they do not directly measure the performance of the main condenser. The condensate inlet to the main air ejectors, the main condensate pump suction, and the main condensate pump discharge are not as representative of the main condenser's performance as the air ejector condensate discharge.