How does a Cochran boiler work?
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.
What are the special features of the 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.
Is Cochran boiler high pressure?
Disadvantages of Cochran Boiler Low rate of steam generation. Inspection and maintenance is difficult. High room head is required for its installation due to the vertical design. It has limited pressure range.
What is the working pressure of Cochran boiler?
6.5 bar
The Cochran boiler has a working pressure of 6.5 bar and a steam capacity of 3500 kg/hr. The water level indicator is an important fitting in the boiler and it shows the water level inside the boiler.
What is the function of chimney in Cochran boiler?
A chimney is provided at the top of the boiler connected to the smokebox. The exhaust gases coming out of fire tubes pass through a smokebox and escape to the atmosphere through a chimney.
Which fuel is used in Cochran boiler?
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.
What type of boiler is Cochran?
multi-tubular vertical fire tube boilers
A Cochran Boiler is one of the multi-tubular vertical fire tube boilers that has several horizontal fire tubes. Cochrans are the modification of a simple vertical boiler where the heating surface has been increased employing some fire tubes.
What is Draught in boiler?
The difference between atmospheric pressure and the pressure existing in the furnace or flue gas passage of a boiler is termed as draft. Draft can also be referred to as the difference in pressure in the combustion chamber area which results in the motion of the flue gases and the air flow.
What is PA fan in boiler?
Primary Air Fans: Primary air fans or PA fans are high-pressure fans, used in the boiler power plants to supply the air for transportation of coal directly from the pulverizer to the furnace. PA fans give positive pressure upstream of the coal pulverizer and handle relatively clean air.
What is Cochran boiler?
A Cochran Boiler is one of the multi-tubular vertical fire tube boilers that has several horizontal fire tubes. Cochrans are the modification of a simple vertical boiler where the heating surface has been increased employing some fire tubes.
What is ID and FD in boiler?
An ID fan removes flue gases from a boiler and forces exhaust gas up a stack. Nearly every ID furnace operates with a slightly negative pressure. Forced Draft. Forced draft (FD) is achieved by forcing air into a furnace with a special fan and ductwork.
What is ID and FD fan?
The key difference between a forced draft and an induced draft fan is, FD fan forces outside air into the heating system whereas an ID fan draws flue gases from the system out into the atmosphere.
What is APH boiler?
Air Preheaters (APH) are Shell and tube type heat exchangers installed in boilers to heat the air before using it for combustion. The main function of an air preheater is to extract the excess heat from the flue gases in the boiler.
What is SA fan in boiler?
Secondary fans play an important role in power plants. The fuel inside the furnace can be burned with the help of the secondary fan. When required, the SA fan is used to increase the air flow to improve efficiency and save fuel.
What is FD fan and ID fan?
What is ID & FD fan?
What is ID and FD fan in boiler?
What is function of FD fan?
Forced Draft Fans (FD) supply the air necessary for fuel combustion by pushing air through the combustion air supply system and into furnace. These fans are located at the inlet of boiler to push high pressure fresh air into combustion chamber, where it mixes with the fuel to produce positive pressure.