Application of Residue Theorem to evaluate real integrations.pptx
1311004
1. Khulna University of Engineering &
Technology
Presentation on Cochran boiler
Submitted By :
Himadri Sen Gupta
Roll: 1311004
2. Cochran Boiler :
This boiler is a vertical, multi tube, fire tube, internally
fired, natural circulated ,stationary and a low pressure
boiler.
It is a modification of simple vertical boiler where heating
surface is being increased by number of fire tubes .
Improvement over the simple vertical boiler as it provides
greater heating surface.
5. Parts of Cochran Boiler:
1.Ash pit:
Ash pit contain the ashes of the fuel material after the complete combustion.
2. Grate
Grate contain the fuel for combustion
3. Feed check valve
Feed check valve is used to check the level of fuel material inside the grate
4. Fire hole
Fire hole is used to introduce the initiating fire spark
6.
7. 5.Flue pipe
Flue pipe take the hot gases from the hemispherical crown and move it toward the combustion
chamber.
6. Fire brick lining
Fire brick lining make sure that heat remain inside and outer side remain cool.
7. Smoke box
Smoke box contain the smoke of burnt gases which come from the fire tubes
8. Water level indicator
It indicates the water level inside the water tank.
9. External shell
Outer shell which is visible to us.
10. Pressure gauge
It indicates the steam pressure inside the boiler
8. 11. Safety valve
Use to prevent the establishing of over pressure inside the boiler.
12. Stop valve
Use to stop the outgoing of steam from the boiler
13. Chimney
Take the smoke from the smoke box and throw it out in the atmosphere.
9. Working of the Cochran boiler:
All the fuel is place in grate and combustion get started.
Hot gases along with some unburnt gases moves from hemispherical crown
into the combustion chamber where all the unburnt gases are burn out to
produce the heat.
Hot gases moves into the tubes there they exchange their heat with the
liquid.
After moving in the tubes gases in the shape of smoke came out into the
smoke chamber from where it moves out through the chimney.
Steam produce is collected into the upper chamber and after the sufficient
pressure steam is released toward the use full purpose.
10. Advantages:
The minimum floor area is required.
Cost of construction is low.
it can be moved and stet up take it to different location.
Boiler has self contained furnace . No brick work setting is necessary.
Any type of flue can be used.
11. Disadvantages:
Steam raising capacity is less due to vertical design.
Difficult in cleaning and inspection due to vertical design.
The capacity and pressure are limited.
The boiler requires high head room.
