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- The Cochran boiler was produced by Cochran & Co. of Annan.
- It is a multi-tubular vertical fire tube boiler having a number of horizontal fire tubes. It is the modification of a simple vertical boiler where the heating surface has been increased by means of a number of fire tubes.
- In this boiler, the fire tubes are placed horizontally.
- The efficiency of this boiler is much better than the simple vertical boiler.
Construction of Cochran Boiler
Main parts of Cochran boiler:
- The main body of the boiler is known as a shell.
- It is hemispherical on the top, where space is provided for steam.
- This hemispherical top gives a higher volume to area ratio which increases the steam capacity.
- The area where the fire is placed known as a grate.
- It is placed at the bottom of the furnace where coal is burnt.
- It is lined with fire bricks on the side of the shell to prevent overheating of the boiler.
- Hot gases enter the fire tubes from the flue pipe through the combustion chamber.
- The combustion chamber is connected to the furnace.
- There are various fire tubes whose one end is connected to the furnace and other to the chimney.
- A number of horizontal fire tubes are provided, thereby the heating surface is increased.
- The small hole is provided at the bottom of the combustion chamber to place fuel is known as fire hole.
- It works as a mediator of fire tubes and combustion chamber.
- It is also dome-shaped like the shell so that the gases can be deflected back till they are passed out through the flue pipe to the combustion chamber.
- It is provided for the exit of flue gases to the atmosphere from the smoke box.
- It is provided for the inspection and repair of the interior of the boiler shell.
- It is a short passage connecting the firebox with the combustion chamber.
Working of Cochran Boiler:
- The Cochran boiler works as same as other fire tube boiler example: Babcock and Wilcox boiler.
Step by Step:
- First, The coal is placed at the grate through the fire hole.
- Then air is entering into the combustion chamber through the atmosphere and fuel is sparked through fire hole.
- Then flue gases start flowing into the hemispherical dome-shaped combustion chamber. This flue gases further moves into the fire pipes. And then
- Heat is exchanged from flue gases to the water into the fire tubes.
- The steam produce collected into the upper side of the shell and taken out by when the required pressure generated and then
- The flue gases now send to the chimney through firebox where it leaves to the atmosphere.
- Now, this process repeats and run continuously. The steam generates used into the small industrial processed.
- Various boiler mounting and accessories are attached to the boiler for its efficient working:
1. Pressure Gauge: It measures the pressure of steam inside the boiler.
2. Safety Valve: It blows off the extra steam when the steam pressure inside the boiler reaches above safety level.
3. Water level Indicator: The position of the water level in the Cochran boiler is indicated by the water level indicator.
4. Stop Valve: Stop valve is used to transfer steam to the desired location when it is required. Otherwise, it stops the steam in the boiler.
5. Blow off Cock: It is used to blow off the settle down impurities, mud, and sediments present in the boiler water.
Application of Cochran Boiler:
- Variety of process applications in industries
- Chemical processing divisions
- Pulp and Paper manufacturing plants
- Refining units
Besides, they are frequently employed in power generation plants where large quantities of steam (ranging up to 500 kg/s) having high pressures i.e. approximately 16 megapascals (160 bar) and high temperatures reaching up to 550 °C are generally required.
Features of Cochran boiler are listed below:
- In Cochran boiler, any type of fuel can be used.
- It is best suitable for small capacity requirements.
- It gives about 70% thermal efficiency with coal firing and about 75% thermal efficiency with oil firing.
- The ratio of grate area to the heating surface area varies from 10: 1 to 25: 1.
- Low floor area required.
- Low initialization cost.
- It is easy to operate.
- Transport from one place to another is very easy.
- It has a higher volume to area ratio.
- Low steam generation rate.
- Limited pressure handles capacity.
- It is difficult to inspect and maintain.
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