Factors That Influence Condenser Performance - DUNIA PEMBANGKIT LISTRIK

DUNIAPEMBANGKITLISTRIK.COM - Performance factors at the condenser are generally monitored through changes in vacuum pressure (negative), where changes in pressure on the condenser will affect the efficiency and capability of the turbine.

If the vacuum pressure on the condenser is lower then the performance and efficiency of the turbine will increase, and vice versa if the vacuum pressure is high (close to positive), the condensation process will run slowly and some exhaust vapors from LP Turbine are in a saturated state (X = 0, 72) not all is released into the condenser so that it will cause corrosion at the last stage in the LP turbine. 

Therefore maintaining the performance of the condenser to remain optimal is very necessary so that the operation of the plant can run optimally and the efficiency of the unit can be maintained.

Factors That Influence Condenser Performance

Several factors that can influence the performance of a condenser include:

Cleaning the surface of the cooling water side tube :

Dirt carried by cooling water from the sea, river or cooling tower will stick to the surface in tubes, water boxes, pipes and so on. This dirt will inhibit the transfer of heat from steam to cooling water and finally the condensation pressure becomes high, besides that this impurities can also inhibit or reduce the flow of cooling water.

Cleanliness of the steam side tube surface :

In general, the surface of the steam side tube will remain clean because it is caused by the temperature and pressure of the LP Turbine exhaust, but during operation there is a possibility that the surface of the condenser tube is coated by noncondensable gases so that it inhibits the transfer of heat from steam to water the cooler. A good condenser design will take into account this effect so that the gases will be swept away by the flow of steam.

Cooling water flow :

Cooling water flow that is not appropriate or less than the standard design will reduce the cooling capability so that the temperature and condensation pressure will increase. The reduction in cooling water flow can be caused by the inefficiency of the cooling water pump, the bottlenecks caused by the valve not fully open, the presence of garbage or dirt in the pipes and filters, or because the sea / river or cooling tower water level is lower than the standard design.

Cooling water temperature :

The temperature of cooling water originating from the sea and rivers is strongly influenced by the weather or season, in contrast to the cooling water taken from the cooling tower the degree of temperature is influenced by the performance of the cooling tower and the temperature of the outside air as the cooling medium.

Air or Gas in cooling water :

The air or gas trapped inside the condenser tube will cause less optimal direct contact between the cooling water and the surface of the condenser tube so that the heat transfer is not good. This trapped air or gas must be removed through venting

Air or gas in steam and vacuum equipment capability :

Under normal conditions all steam entering the condenser will be completely condensed. Whereas at the operating temperature of the condenser, the air or gas carried by steam cannot condense and will result in an increase in condensation pressure. This non-condensing air or gas will be sucked up and discharged by vacuum making equipment (steam ejector or vacuum pump). Too much air / gas or the ability of vacuum equipment that is not optimal will cause condensation pressure to rise.

Condensate Water Level :

Condensate water level that is too high will inundate some of the condenser tubes on the bottom side, so that it will reduce the surface area of ​​the cooler because the steam cannot touch the submerged part of the tube, and eventually the condensation temperature and pressure will rise.

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