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Steam condensing and falling as drops. Water drops have to pass through steam passing under the tube bank and hence are reheated to close to their sat temperature. With the regenerative effect the water is heated to within one degree of the sat temperature so releasing dissolved gases which may have been re-absorbed as the drops where falling. The dissolved oxygen content should be less than 0.02 ml/litre. At the air ejector take off for the gasses, a cooling space is so arranged so a to ensure that there is no reheating of the gasses which would lead to expansion and reduce the efficiency of the process. Drains which are led to the condenser are led to the top so the water is reheated/dearated before extraction. The increasing use of scoops has led to the single pass condensers with SW velocities of 2 - 4 m/s being the ideal with minimums to prevent silting of 1m/s.

Related Terms

STEAM CONDENSER

A heat exchanger wherein steam is condensed either in direct contact with cooling water or indirect contact with cooling water through a heat transfer medium separating them. Functions of condenser are:

  1. To remove the latent heat from the exhaust steam so that the condensate thus obtained can be easily handled by the pumps in the feed system.
  2. To reduce the backpressure and so allowing a greater amount of work to be done by the engine for a given quantity of steam, thereby improving the efficiency.

Steam Condenser

There are two types of condensers:

  • Surface
  • Regenerative

In the surface type, there is a temperature drop of about 8°C from inlet to outlet and the condensate and air leaves from the bottom. The drop in temperature signifies a loss of sensible heat, termed undercooling of the condensate.
In the Regenerative type, steam flowing along the regenerative passage and up into the tube nests heats the condensed droplets from the tubes so that there is practically no drop in temperature. Air trapped by the baffles is extracted separately.
In practice, there is a drop in temperature of 1 to 2°C and the cut down in undercooling can amount to saving on the fuel of about 1 to 1.5%. The regenerative condenser is the first direct contact feed heater in the feed system and aided by the air ejector it has a deaerating effect on the condensate.
Condensers for turbines are of the Regenerative type; single or double flow; underslung, i.e. usually hung off the LP turbine casing - the springs act as shock absorbers and support about 1/3 of weight. A single flow can be built for scoop arrangements.

regenerative condenser

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