Notes on Boiler and Cochran Boiler

COCHRAN BOILER

COMPETITIVE EXAM TOPIC FOR

SSC, DRDO, DSSSB, UPSC, J.E FOR RAILWAY, DELHI METRO

BOILER- COCHRAN BOILER

(THERMAL ENGINEERING)

 

BOILER

Boiler is a Device which is used to convert water into steam in a closed vessel through the combustion of fuel under the high pressure and temperature.

 

CLASSIFICATION OF BOILER

There are two types of boiler:-

  1. Fire Tube Boiler.

  2. Water Tube Boiler.

 

Fire Tube Boiler

 

In case of fire tube boiler flue gases are flowing through the tube of the boiler and water surrounding the tube of the boiler as shown in figure below:-

firetube_boiler
Firetube boiler

Water Tube Boiler

 In case of water tube boiler the water flowing through the tube of the boiler and flue gases surrounding the tube of the boiler as shown in figure below:-

 

 

watertube_boiler
                                                                Watertube boiler

Example of Fire Type Boiler:

COCHRAN BOILER

A Cochran boiler is a fire tube boiler. In this type of boiler, flue gases are flowing through the tubes and water surrounds the tubes in the boiler.

cochran_boiler
Cochran boiler

A Cochran boiler is a vertical tube boiler. In this type of boiler, charge or coal is placed in the furnace through the fire hole. When the coal burns in the furnace or other charge burns in the furnace, due to which flue gases generated. These flue gases go into the chamber from the furnace through the small opening as shown in figure below.

The flue gases from the chamber go into the boiler tubes which is submerged into the water from the surrounding. These flue gases when flow through the tubes then these flue gases transfer their heat to the surrounding water due to which surrounding water gets heated and is converted into the steam. This generated steam is collected into the top most part of the boiler which is known as Dome shape tank. The flue gases pass out from the tubes and go out into the atmosphere through chimney.   

The safety and efficiency of this type of boiler is increased by Mounting and Accessories.

 

Advantages of Cochran Boiler:

  • Cochran boiler requires low floor area.

  • It has low initialization cost.

  • Cochran boiler is easy to operate.

Disadvantages of Cochran Boiler:

  • It has low generation rate.

  • It has limited pressure handling capacity.

  • It is difficult to inspect and maintenance.

 

The working of the Cochran boiler & Function of Mounting and Accessories & why taper chimney is used in boilers, is given in detail in my video whose link is given below:-

https://goo.gl/pTxHXY

 

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One Thought to “Notes on Boiler and Cochran Boiler”

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