Quick Answer: Why condensed extraction pump is kept in depth below hotwell in thermal power plant?

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.

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).

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.

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What is the purpose of the condensate extraction pump?

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).

Why main condenser is kept in vacuum?

Water is used to condense steam back to liquid water in any form of boiler system, whether on board ship or in power plants. … 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 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 PA fan in thermal power plant?

Primary Air Fans: Primary air fans or PA fans are high-pressure fans, used in the boiler power plants to supply the air for transportation of coal directly from the pulverizer to the furnace. PA fans give positive pressure upstream of the coal pulverizer and handle relatively clean air.

What is GSC in thermal power plant?

The condensate is sent by condensate extraction pumps (CEP) towards gland steam cooler (GSC), drain cooler (DC) and remaining is sent towards low pressure feedwater heaters. Since the extracted steam upon condensation gets subcooled so the drain cooler (DC) is used. … Steam turbine cycle based coal-fired power plant.

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Why deaerator is placed at height?

Why are deaerators placed at height? Deaerators are placed at height to provide sufficient NPSHa (Net Positive Suction Head available) to the boiler feedwater pumps – the boiler feed pumps are typically situated low in the ship for the same reason.

Where is hotwell located?

Hotwells is a district of the English port city of Bristol. It is located to the south of and below the high ground of Clifton, and directly to the north of the Floating Harbour.

Hotwells Location within Bristol
Area 0.155 sq mi (0.40 km2)
Population 3,002
• Density 19,368/sq mi (7,478/km2)

Where is the hotwell located in heat exchanger?

The hotwell is the area at the bottom of the condenser where the condensed steam is collected to be pumped back into the system feedwater. Condensate depression is the amount the condensate in a condenser is cooled below saturation (degrees subcooled).

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.