What are the mountings of boiler?
Boiler mountings are a set of safety device installed for the safe operation of a boiler. There are seven main mountings on a boiler shell; safety valve, steam stop valve, vent valve, pressure gauge, water level indicator, feed check valve and fusible plug.
What are different mountings and accessories used in boiler?
The various boiler mountings and accessories that are used in steam boilers are water level indicator, pressure gauge, safety valves, stop valve; blow off Valve, feed check valve, fusible plug, air pre-heater, super heater, economiser and feed pump.
In which condition Cochran boiler can be used?
Cochran boiler is used for the small steam requirements in industries . where small space and less installation cost required for that requirement these boilers are best suited . For start up of Cochran boiler Coal is feed into the grate bar through the fire box hole and and fuel starting burning.
What is a Cochran boiler?
Cochran Boiler is a multi-tubular vertical fire tubular with multiple horizontal fire tubes. This is a modification of a simple vertical boiler where the heating surface has been extended through several fire fats. …
Can a boiler work without mountings?
Boiler mountings are the devices that are essential for the smooth and safe working of the boiler. They and are mounted onto the boiler, hence, the name “boiler mounting”. A boiler cannot work without boiler mountings.
Why mountings and accessories are essential for boilers?
Boiler accessories are devices that are installed along the boiler and the surrounding area to increase the efficiency of the boiler. These are not an indispensable part of the boiler, and thus without installing these devices, the boiler operation can be completed at low efficiency.
Which is not boiler mountings?
9. Which of the following is NOT a boiler mounting? Explanation: Steam stop valve, Man hole and pressure gauge are boiler mountings. Economizer is a boiler accessory.
What is the use of Cochran boiler?
What Are the Applications of Cochran Boilers? Cochran boilers are used in power generation plants where large quantities of steam from 500 kg/s with high pressures approx. 160 bar and high temperatures reach up to 550o C.
Why economiser is used in boiler?
Economizers lower the consumption of fuel for a given steam demand. They also reduce thermal stress in the boiler and add heat transfer surface area to the boiler system.
Where is Cochran boiler used?
It is used in Refining units. It is used in Paper manufacturing plants. You can find Cochran boilers in Chemical processing divisions. And it is used in a variety of process applications in various industries.
What are the special features of Cochran boiler?
Features of Cochran boiler: 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 the grate area to the heating surface area varies from 10: 1 to 25:1.
What kind of boiler is a Cochran boiler?
Cochran boiler is a vertical, multi-tube boiler generally used for small capacity steam generation. The Cochran boiler is made in different sizes of evaporative capacities ranging from 150 to 3000 kg per hour and working pressure up to 15bar. The Cochran boiler consists of an external cylindrical shell and a firebox.
How is ash collected in a Cochran boiler?
The coal is fed into the grate through the fire door and ash formed is collected in the ash-pit located just below the grate and it is removed manually. The furnace and the combustion chamber are connected through a pipe. The back of the combustion chamber is lined with firebricks.
How does the fusible plug in a Cochran boiler work?
When the temperature of the combustion chamber crosses the permissible level, the fusible plug melts and the water through the combustion chamber enters into the furnace of the boiler and stops the fire. In this way, a big fire accident can be prevented to take place and also protects the boiler from damage.
What kind of brick is used in a Cochran boiler?
It is a special type of brick ling use in Cochran Boiler to reduce the convection of heat from the outer surface of the boiler. Fire Brick is generally made of fire clay. It is used to control the flow of water inside the boiler, it also helps to restrict the backflow of water.