How does a fire tube boiler work?

How does a fire tube boiler work?

In a conventional fire tube boiler, the hot gases move from the firebox into heating tubes immersed by water in the tank. As the walls of the tubes are heated by the gas, the heat transfers into the water, eventually converting the hot water to steam.

What is the difference between a fire tube and a water tube boiler?

The firetube boiler passes combustion gas inside a series of tubes surrounded by water in a vessel to produce steam, while a watertube instead sends water through a series of tubes surrounded by combustion gas used to transfer heat energy and produce steam. …

Why do fire tube boilers explode?

When fire tube boilers run low on water, the metal in the boilers shrinks. In such an instance, if cold water is sent into the boiler, the metal could quickly expand, causing an explosion. It’s not a catastrophic explosion of the vessel where all that energy must be relieved at one time.”

What type of boiler is a Morrison tube?

Fire-tube boilers with packaged automatic gas, oil, or dual-fuel burners having integral fans. These three-pass boilers have a large Morrison tube into which the burner fires as the first pass (radiation), and two banks of many small tubes (convection) for the second and third passes.

What type of cylinder is used in boiler shell?

The general layout is that of a squat horizontal cylinder. One or more large cylindrical furnaces are in the lower part of the boiler shell. Above this are many small-diameter fire-tubes. Gases and smoke from the furnace pass to the back of the boiler, then return through the small tubes and up and out of the chimney.

What is the function of superheater in boiler?

The superheater heats steam above the saturation temperature for a particular boiler pressure. Superheater tubes have steam on one side and hot combustion gases on the other.

What is the function of economiser?

Economizers are mechanical devices intended to reduce energy consumption or perform a useful function such as preheating a fluid. In basic terms, an economizer is a heat exchanger.

What is boiler efficiency definition?

Definition of Boiler Efficiency is “The percentage of the total absorption heating value of outlet. steam in the total supply heating value.” In other word, it is a rate how the boiler runs efficiently.

What is the function of fusible plug in boiler?

The function of fusible plug is to protect the boiler from damage due to overheating of boiler tubes by low water level. it is simply a hollow gun metal plug screwed into the fire box crown. This hollow gun metal plug is separated from the main metal plug by an annulus fusible material.

What happens when a fusible plug in a cylinder melts?

The fusible plug is made of a metal alloy designed to melt. Once the plug melts away, the gaseous chlorine will spew out of the small hole. As the temperature of the released chlorine near the hole drops and chlorine icing slows the leak, the pressure inside the cylinder is also decreasing.

Where is fusible plug located in boiler?

Steam Boiler Fusible plug is a pressure safety valve (PSV) which defends the boiler from failure due to high pressure. Fusible plug is located on top surface of the steam boilers.

Which material is used for fusible plug?

A fusible plug is a threaded metal cylinder usually of bronze, brass or gunmetal, with a tapered hole drilled completely through its length. This hole is sealed with a metal of low melting point that flows away if a pre-determined, high temperature is reached.

What is the difference between a fusible plug and rupture disk?

Fusible Plug Devices: This device is a plug made of fusible metal that’s designed to yield or melt at low temperatures. The rating of the metal’s temperature is stamped onto the device. The gas that uses this type of device is acetylene. Combination Rupture Disks: A rupture disk is backed by the previous fusible plug.

What is fusible plug in fluid coupling?

The Role of Fusible plug fluid coupling Fusible plug is a fluid coupling overheating protection device, is one of the essential components, coupling the brake or overload, the maximum torque of about 2 to 2.5 times the rated torque, or higher.

At what temperature does a fusible plug melt?

Fire-activated fusible plugs are filled with pure tin and feature a melting point between 445°F and 450°F.

Is fusible plug is mounting?

To protect the boiler against damage due to overheating for low water level. Description: It is fitted on the fire box crown plate or over the combustion chamber at its approprirate place. A common form of fusible plug is illustrated in Fig.

How do you test a fusible plug?

Fusible Plug Test These standards specify two type of tests in common regarding fusible plugs: the yield temperature test and the hydrostatic test. Yield temperature test tells that whether the fusible plugs will operate at their designed temperatue.

What is the excess discharge temperature of fusible plug?

Fusible plug is fitted under side of the pipe between relief valve and air bottle. It is fitted to release the compressed air in the event of abnormally high compressed air temperature. Fusible plug melt at 105 °C and release all content of air.

What is a fused plug?

A plug fuse is a safety device which is connected into an electrical circuit to prevent excessive current flow during fault conditions. Upon overload, the wire fuse element heats up and melts, or blows with a resounding bang, interrupting and cutting off the current flow.

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