Loeffler Boiler: Definition, Parts, Working, Advantages, Disadvantages, and Applications

Want to know about Loeffler Boiler?

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Definition of Loeffler boiler-

Loeffler Boiler is a forced circulation, high pressure, and water tube boiler with an internally fired furnace.

In this boiler, 2/3 of superheated steam is used to evaporate the water in the evaporating drum and the remaining 1/3 of the steam from the superheater is used by the turbine.

Steam circulating pump is used to circulate the steam into the boiler. The Loeffler boiler is an addition to the Lamont Boiler.

Parts or construction of Loeffler Boiler-

Here are some parts or Boiler’s Mounting and Accessories and its construction-

• Economiser
• Evaporative Drum
• Mixing Nozzle
• Steam circulating Pump
• Radiant Superheater
• Convection Super Heater
• Steam Outlet

Economiser-

The feed water from the feed tank is supplied to the economizer by the feed pump. It is known as Air preheater.

In the economiser, the feed water is made to flow through a number of tubes surrounding which the hot gases leaving the furnace to pass over.

There is a heat exchange from the hot gases to the feed water, which is preheated in the economiser.

Evaporative Drum-

It is housed away from the furnace. It contains a mixture of steam and water.

The feed water from the economiser tubes enters the evaporator drum into which is also passed 2/3 of the superheated steam generated by the boiler.

The superheated steam gives its superheat to the water in the drum and evaporates it to saturated steam.

Mixing Nozzle-

The nozzle distributes and mixes the superheated steam throughout the water in the evaporator drum.

Steam circulating Pump–

Steam circulating pump forces this saturated steam from the evaporator drum to the radiant heater through the tube of the furnace wall.

Radiant Superheater–

The radiant superheater is placed in the furnace. The hot gases in the furnace are used for superheating the saturated steam from the drum.

The radiant superheater receives heat from the burning fuel through the radiation process.

Convection Super Heater–

Steam from the radiant heater enters into the convection superheater where it is finally heated to the desired temperature of 500°C.

The convection superheater receives heat from the flue gases entirely by convective heat transfer.

Both radiant and convection superheaters are arranged in series in the path of flue gases.

Steam Outlet-

About 1/3 of the superheated steam from the convection superheater passes to the steam turbine while the remaining 2/3 is passed onto the evaporator drum to evaporate the feed water to saturated steam.

Capacity-

The capacity of this boiler is about 100 tons/hour of superheated steam generated at a pressure of 140kgf/sq.cm and at a temperature of 500°C.

Loeffler boiler diagram-

Now, let’s move to the working section, where you know the fundamental working of this boiler. So, here I dive in-

Working of Loeffler Boiler-

The feed pump draws water from the hot well and delivers it to evaporating drum through the economiser.

About 65% of the steam coming out of the superheater is passed through the evaporator drum in order to evaporate the feed water coming from the economiser.

Steam circulating pump draws the saturated steam from the evaporator drum and then passed through the radiant and then convective superheater.

About 35% of the steam coming out from the superheater is supplied to the turbine.

This was the Loeffler boiler working principle.

Advantages-

Here are some advantages of Loeffler Boiler-

• High salt concentration
• Compact
• High steam generation capacity
• Flexible operation
• Economical

Disadvantages-

Here are some Disadvantages of Loeffler Boiler-

• Bubble formation
• havier and costly part

These were the Loeffler boiler advantages and disadvantages, now let’s move to its applications.

Applications-

Here are some Loeffler boiler applications-

• Steam generation
• Marine Industry
• Power Generation

 

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If you have any questions or suggestions, feel free to ask and say in the comment section down below or through various preferred contact mediums.

If want to read more, then here are some suggested articles-

Benson Boiler

Velox Boiler

LaMont Boiler

Stirling Boiler

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