with the help of neat diagram, explain the working of a Cochran boiler
Answers
Explanation:
The Cochran boiler works as same as other fire tube boiler. First, The coal is placed at the grate through the fire hole. Then the air is entering into the combustion chamber through the atmosphere and fuel is sparked through fire hole. ... Heat is exchanged from flue gases to the water into the fire tubes.
Answer:
Cochran Boiler is a vertical drum axis, natural circulation, natural draft, low pressure, multi-tubular, solid fuel fired, fire tube boiler with internally fired furnace. It is the modified form of a simple vertical boiler. In this boiler, the fire tubes are placed horizontally. The efficiency of this boiler is much better than the simple vertical boiler.
Main Parts and Construction
Cochran Boiler
1. Shell:
It has a vertical axis cylindrical drum with a hemispherical dome-type shell at the top.
2. Grate:
It is the platform on which the solid fuel is burnt.
3. Combustion Chamber:
The burning of fuel takes place in the combustion chamber.
4. Fire Tubes:
Cochran boiler has multi-tubular fire tubes. The hot flue gases from the combustion chamber travels to the smokebox through these fire tubes. The fire tubes helps in the exchange of heat from the hot flue gases to the water.
5. Fire Hole:
It is the hole provided to fire the fuel inside the furnace.
6. Furnace:
It lies at the bottom of the boiler. Furnace is the place where all the fuel is burnt. Without furnace, the working of this boiler is not possible.
7. Chimney:
The chimney is attached to the smokebox. It transfer smoke to the environment. The size of the chimney is small as compared with other boiler.
8. Fire Brick Lining.
The fire brick lining is present in the combustion chamber and helps in the combustion of the fuel.
9. Manhole:
A manhole is provided for the cleaning and inspecting of the boiler from inside.
10. Flue Pipe:
It is a small passage connecting the firebox and combustion chamber. The hot gases enter into the combustion chamber through the flue pipe.
Other Boiler mountings and accessories attached to the this boiler are:
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 Valve: It is used to blow off the settle down impurities, mud and sediments present in the boiler water.
