Why condensate extraction pump is vertical?

Why condensate extraction pump is vertical?

The CEP are vertical canned type to ensure Net Positive Suction Head Available (NPSHA). In small plants, they can also be horizontal end suction type. In medium to large size coal- and oil-fired power plants, the CEP are vertical canned type to ensure enough Net Positive Suction Head Available (NPSHA).

How do you keep the condenser level on a hotwell?

Set Points Of Levels In Condenser Hot Well

1. Generally we try to maintain hot well level at 0 MM or normal level.
2. If hot well level falls below 0 mm, normal make up valve will open and allow DM water to condenser in order to maintain normal level.At Low level this normal make up valve will be fully opened.

What is hotwell in condenser?

Steam enters the condenser where it cools and condenses into water before being sent to the low-pressure feed-water heater. The condenser hotwell serves as a water reservoir for the turbine cycle. When hotwell level reaches the low point, a valve opens to supply make-up water to the cycle.

What is the function of CEP?

Condensate extraction pumps (CEP) extract the condensate water from the condenser and pump it through the condensate polishing system and the LP heaters to the de-aerator feed water tank. The CEP are vertical canned type to ensure Net Positive Suction Head Available (NPSHA).

What is condensate pump in power plant?

A condensate pump is a centrifugal pump which is named after the type of fluid handled. It is used in condensers to pump out the condensed steam as water (condensate) in a technical vacuum (near vapour pressure).

How does condensate pump work?

Designed to run intermittently, condensate pumps include a collection tank where condensate (captured condensed liquid) can accumulate. When the liquid in the tank reaches a designated level a float switch activates the pump. As liquid rises to the designated first stage, the pump is activated.

Why main condenser is kept in vacuum?

A vacuum is maintained in the condenser so that steam can easily flow and more work can be extracted from the steam in the turbine; this is the reason why vacuum is maintained in condensers.

What is the purpose of cascade tank?

Cascade tank, also known as hot well, is a part of boiler feed water system. Water is pumped into the cascade tank from the feed water tank. The boiler water is treated in the cascade tank and the return from the steam heating system is also connected to the hot well.

What is a hotwell pump?

a receptacle for the hot water drawn from the condenser by the air pump. This water is returned to the boiler, being drawn from the hot well by the feed pump.

What is hotwell?

Definition of hot well 1 : hot spring. 2 : a reservoir in a condensing steam-engine or turbine installation for receiving the warm condensed steam drawn from the condenser.

What is GSC power plant?

GSC (Gland steam condenser) is simply an efficiency improver in thermal power plants. The working of GSC is quite simple as like condenser. It has shell inside which some tubes are mounted. …

What is extraction pump?

extraction pump, Fig. 1 (a), is a pump which takes a condensate from power plant condenser and delivers that condensate to deaerator through low pressure feed water heaters.

What is a condensate extraction pump?

What seems in some discussions to be called “condensate extraction pumps” are known in many power plants as simply “ condensate pumps”. In a power plant, the main feedwater pumps boost water pressure to whatever pressure is needed to feed the boiler or steam generators.

What is the pressure of the condensate pump in a power plant?

This pressure is most often 1100 psig (nuclear plants) or much higher ( fossil plants). The condensate pumps are lower pressure pumps ( ~600 psig) designed to take suction from the low pressure condenser hotwell and deliver it to the main feedpumps.

Why is the CEP impeller below the Hotwell of the turbine?

As hotwell is connected to the condenser, which is in turn at the end of the LP (low pressure) stage of the turbine, it is subjected to very low pressure (`50 mm Hg). Keeping the CEP below the hotwell makes it necessary for the pressure at the eye of the CEP impeller to be above the NPSH of the impeller.

How does a cooling water pump work in a power plant?

The main purpose of CW or cooling water pumps in any power plant is to condense the extra low pressure steam which in turn improves the efficiency of the plant. CW pumps inject raw water into the tubes of condensor where hot steam flows outside tgese tubes.