HomeThermal EngineeringBoilersLa Mont Boiler: Parts, Working, Features, Advantages and More.

La Mont Boiler: Parts, Working, Features, Advantages and More.

In this post, we will discuss La Mont Boiler and Its Definition, Parts, Working, Advantages and Application of La Mont Boiler.

La Mont Boiler Definition

The La Mont boiler was developed by Walter Douglas La-Mont. La Mont first introduced a forced circulation boiler in 1925. This is one of the modern high-pressure water tube type steam boiler working on forced circulation. A circulating pump is employed to circulate water inside the small-bore water tubes of the boiler.

Parts of La Mont boiler

The following are the main parts of La Mont Boiler:

  1. Feed pump
  2. Furnace
  3. Grate
  4. Economiser
  5. Circulating pump or centrifugal pump
  6. Superheater
  7. Radiant evaporator
  8. Convection evaporator
  9. Evaporator tubes
  10. Steam separating drum
  11. Air pre-heater

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1. Feed Pump

A feed pump is used to drive the feed water at high pressure inside the boiler.

2. Furnace

The vertical furnace is employed in the La Mont boiler. The principal function of the furnace is to burn the solid fuel.

3. Grate

The surface area of the grate, over which the fire takes place, is called the grate surface. It is on the underside of the furnace.

4. Economiser

Economiser uses the remaining heat of combustion gases to preheat water. It increases the overall efficiency of this boiler by decreasing fuel consumption.

5. Circulating Pump or Centrifugal Pump

It is a centrifugal pump driven by means of a turbine. This transmits the water from steam separating drum to the small diameter tubes of the radiant superheater, convection superheater and back to the steam separator.

6. Superheater

The superheater is used to raise the temperature of the steam above the saturation temperature. In this, it superheats the steam to the desired temperature to hit the turbine blades for power generation.

7. Radiant Evaporator

In the radiant evaporator, It evaporates the mixture of water and steam with the help of radiation method.

8. Convection Evaporator

It converts the mixture of water and steam into saturated steam through the convection method of heat transfer.

9. Evaporator Tubes

Evaporator tubes or water tubes are located on the furnace wall which increases the heating surface of the boiler. It is also placed above and below the furnace. The main purpose of these tubes is to evaporate the water into steam.

10. Steam Separating Drum

The steam separating drum is placed outside the boiler. The mixture of water and steam from the evaporator tube transfers to the steam separating drum, where it separates the steam and then forwards it to the superheater. After, the remaining water is again sent back to the economiser.

11. Air Pre-heater

In the air pre-heater, it preheats the air before entering the furnace.

Working Principle of La Mount Boiler

It works on the principle of forced circulation of water inside the boiler. The circulation is controlled by a centrifugal pump, operated is then drawn to the circulating pump through the tube. by a steam turbine. The centrifugal pump transmits the mixture of steam and water into the small diameter tubes of the boiler.

Working of La Mont Boiler

A diagram of La Mont steam boiler is shown in the figure. The feed water from the hot well is supplied to storage and separating drum (boiler) through the economiser. Most of the sensible heat is supplied to the feedwater passing through the evaporator tubes and the part of the vapour is separated in the separator drum.

La Mont Boiler

The forced circulation causes a weight of feed water to circulate through the water walls and drums equal to 10 times the weight of steam evaporated. This prevents the tubes from being overheated.

It is then moved to the circulating pump over the tube. The centrifugal pump delivers the water to the headers ar a pressure of 2.5bar above the drum pressure. The distribution headers distribute the water through the nozzle into the generating tubes acting in parallel to the evaporator.

The water and steam from these tubes pass into the drum. Now, the steam is separated in the boiler is further passed through the superheater where the steam is superheated. Superheater improves the steam temperature to the desired level.

Finally, the superheated steam transfers to either steam collecting drum or supplied to the prime mover for power generation. The working pressure, temperature and capacity of this boiler are maybe of 170 bar, 773 k (kelvin) and 50 ton/hour.

Features of La Mont Boiler

  1. An advanced steam circulation and water circulation system exist.
  2. It has excellent tubing process.
  3. The boiler has an advance heating process.

Advantages of La Mont Boiler

  1. This boiler can be started easily.
  2. It transfers the heat at a higher rate.
  3. The La Mont boiler has a high steam generation capacity of about 50 tons/hour.
  4. It can be easily reassembled with the natural circulation boiler.
  5. Simple in design.
  6. It is a high-pressure boiler.

Disadvantages of La Mont Boiler

  1. The bubbles are formed on the surfaces of the tubes in this boiler. This decreases the heat transfer rate for steam.


So as you know La Mont Boiler is a high-pressure water tube steam boiler. And it is easy to get started and it has a high steam generation capacity. La Mont Boiler has a great application in a power plant industry.

So now, we hope that we have clear all your doubts. If you have still any doubts about the “La Mont Boiler” you can contact us or ask in the comments.

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Saif M
Saif M. is a Mechanical Engineer by profession. He completed his engineering studies in 2014 and is currently working in a large firm as Mechanical Engineer. He is also an author and editor at theengineerspost.com