How does a boiler feed pump work?

How does a boiler feed pump work?

The work of a boiler feed pump is to discharge the condensate boiler feed water from hotwell to the boiler drum. With the rotation of shaft and impeller the hot feed water is thrown outwards radially across the walls of the pump; along the path of the flow. This increase the speed of the fluid so does the pressure.

What is the purpose of a feed or supply pump?

A feed pump is a type of pump that supplies water to a boiler to produce steam. For industrial purposes, a feed pump supplies a liquid for further processing. These pumps are high-pressure pumps and are generally of two types: Positive displacement type feed pumps.

What is a boiler feed pump turbine?

In general, the boiler feed pump turbine uses both steam from the boiler and the main turbine to drive the mechanical shaft connected to the boiler feed pump. This arrangement has proven highly successful in efficiently applying the steam’s thermal energy throughout the plant.

How do I size a boiler feed pump?

Another quick rule of thumb is that 1/10 of a gallon is needed for every boiler horsepower. So a 500 HP boiler will need a pump capable of delivering 50 gpm. An 800 HP boiler will need an 80 gpm pump. The next step is to determine the proper discharge of the pump.

How do you start a boiler feed pump?

START THE Boiler Feed Pump

1. check starting current and time.
2. Check the recirculation valves opens and proper suction flow in maintained.
3. Check electrically operated cooling water valve opens and cooling water flow is established.
4. Check warm up valve has closed.
5. Check auxiliary lube.
6. Check feed pump vibration are normal.

What is the function of boiler feed pump Mcq?

Explanation: Function of feed water pump is to pump water at high pressure to the water space of the boiler drum.

Why boiler feed pump is multistage?

In order to produce steam, boilers and steam generators require feedwater. Multistage pumps are often used for boiler feed because the process requires high pressure. Boiler feed pumps discharge water into a boiler drum. In turn, the boiler heats up the water and turns it into steam.

Where does the feed pump takes suction?

-The main feed pumps take their suction directly from the discharge line of the main feed booster pump. This means that the suction to these pumps is under a normal pressure of from 50 to 60 p.s.i., depending upon the load on the pump.

How does a turbine driven pump work?

Turbine pumps are dynamic pumps, meaning they utilize fluid momentum and velocity to generate pump pressure. Specifically, they are centrifugal pumps, which generate this velocity by using an impeller to apply centrifugal force to the moving liquid.

How is boiler feeding pump head calculated?

An Example: Calculate Pump Net Flow Rate

1. Boiler Capacity = System Load + Blowdown + Steam to DA. Boiler Capacity= 34,000 pph + (3\% x 34,000 pph) + (8\% x 34,000 pph) = 34,000 pph + 1,020 pph + 2,720 pph. = 37,740 pph.
2. Boiler Evaporation Rate = Boiler Capacity(pph)/500. = 37,740 pph / 500. = 75.5 gpm.
3. Capacity for “Catch up”

What kind of pump should a boiler feed pump?

centrifugal pumps
Today, all boiler feed pumps are centrifugal pumps. The design of boiler feed pumps regarding power input, material, type of pump and drive is largely governed by the developments which have taken place in power station technology.

What is the function of pressure gauge in the boiler?

What is the function of pressure gauge in the boiler? Explanation: The function of the pressure gauge is to indicate the steam pressure inside the boiler drum in bar or in Kgf in cm2 or in KN/m2 in gauge pressure.

What is the objective of a boiler feed pump?

Develop and communicate a business case for greater diversity, equity, and inclusion. The objective of a Boiler Feed Pump is to pump the boiler feed water to the boiler (Water Drum).Now the pressure inside the boiler is way above the atmospheric pressure ,so the feed water’s pressure has to be anytime more than the design pressure of the boiler.

What does a booster pump do in a boiler?

The boiler feed pump has a minimum required suction pressure without which there will be cavitation causing loss of pressure, efficiency and also erosion of pump internals. Thus, the booster pump increases the pressure of feed water so that the suction pressure required is achieved. What is a high pressure boiler?

What was the pressure of a boiler feed pump in 1955?

By 1955 the average discharge pressure had risen to 400 bar. The mass flow rates were in the region of 350 tonnes/h in 1950, compared to 3200 tonnes/h (in some exceptions up to 4000 tonnes/h) today. Boiler feed pumps operate at fluid temperatures of 160 to 210 ºC. In exceptional cases the temperature of the fluid handled may be higher still.

What is a boiler impeller and how does it work?

Multiple impellers are used in series to generate the high pressures necessary to feed the boiler. Sometimes referred to as Between-Bearing Pumps (BB Pumps), bearings on each end support the shaft of the pump. The impellers are in between the bearings.