Fire tube boiler vs water tube boiler pdf

Comparison between fire tube and water tube boiler me. This video briefly describe fire tube boiler and water tube boiler. Compared with shellandpan boilers, watertube boilers have no large diameter shell in structure. Two primary boiler types, the firetube boiler and the watertube boiler, are essentially opposite in design. This video contains the difference between fire tube boiler and water tube. Difference between fire tube boiler and water tube boiler fire tube. The older fire tube boiler design, in which the water surrounds the heat source and gases from combustion pass through tubes within the water space, is a much weaker structure and is rarely used for pressures above 2. Operation and types of water tube boiler electrical4u. A high pressure watertube boiler also spelled watertube and water tube is a type of boiler in which water circulates in tubes heated externally by the fire. Hurst scotch marine boilers are rated to 81% minimum efficiency.

A water tube boiler runs off of water tubes that are heated externally by fire. Patented stainless steel heat exchanger eliminates high stress point welds. Efficiency of the water tube boiler is more than that of fire tube and lies within the range of 85 to 90 %. The universal type of steam boilers is the smoke tube or fire tube boiler where the heat and gases of combustion from furnace pass through tubes that are enclosed by water. The boiler circulation system is constructed of tubes, headers, and drums joined in arrangement that provide water flow to generate steam. The tubes connect to a steam drum and a mud drum, and steam is produced in the upper drum. These boilers were an integral part in leading the way in the industrial revolution starting in the 1860s. Boiler evolution 4 steam locomotive cutaway furnace convection tubes steam dome tube sheet stack water line note. The dry back boiler design uses a common rear tube sheet and features convenient fireside and waterside access. Fire tube boiler definition, construction, working. Fire tube steam boiler nationwide boiler nationwide. In the literature, a comprehensive modeling for fire tube boilers has not been treated. Aug 06, 2014 normal efficiency of the fire tube boiler is about 80 to 85 % but this can be increase or decrease by using different a accessories. Fire tube boiler is those boiler in which the fire or hot gas is present inside the tubes and water surrounds these fire tubes.

Jun, 20 from a cold start, the firetube boiler, due to its larger water volume, takes longer to bring up to operating temperature or pressure vs. The main requirement of this boiler is that it should produce steam at a very high rate. They work by circulating hot gas through tubes, which in turn run through a water tank. In water tube boilers, the fluid with the higher density flows through the tubes and the fluid of lower density flows through a larger diameter external to the tubes combustion chamber, ultimately resulting in water tube boilers having higher overall heat transfer coefficient when compared to a fire tube condensing boiler of the same size and. Fire tube boilers, typically have a lower initial cost, are more fuel efficient. In this work, the modeling of the heat transfer between flue gas and water in a fire tube boiler is considered. Watertube or firetube condensing boiler, which is the. A boiler is a closed vessel in which steams are generated water to steam with the help of coalburning or other fuel substances basically, there are two types of boiler. Differences between fire tube boiler and water tube boiler.

These units have watercooled furnaces, and the air for combustion is supplied. This is a boiler in which the fire or hot gas is present inside the tubes and water surrounds these fire tubes since fire is inside the tubes and hence it is named as fire tube boiler. The fire tube boiler is the boiler in which fire hot flue gases is inside the tube and water is surrounded by them some example of fire tube boiler are. The difference between fire tube boiler and water tube boiler can be done on various points. D, dl and dld which vary only in size, dimensions, and capacity. A water tube boiler can be defined as a steam boiler in which the flow of water in the tubes, as well as hot gases, enclose the tubes. Although firetube boilers are smaller in design, they have a larger water volume than similar size watertube boilers, causing them to take longer to bring up to operating temperature from a cold start. The 316l stainless steel fire tube heat exchanger is more resistant to corrosion in comparison to typical copper or aluminum heat exchangers. The high efficiency mascot ft fire tube combination boiler and water heater mascot ft wall hung and floor standing combination boilers size range.

Fire tube boiler have lower rate of steam production compare to water tube. Aug 30, 2019 the water tube boiler generates more steam of high pressure whereas a fire tube boiler generates steam of low pressure. These boilers is largely used in power development and other industrial like sugar industries, cotton industries etc. The hot flue gases generated by the boilers combustion are channeled into tubes and routed through a water tank, and the heat. Advanced user interface and controls with intuitive text display, simplifies boiler setup. Firetube boiler a firetube boiler is a type of boiler in which hot gases from a fire pass through one or more tubes running through a sealed container of water. It contains cross tubes and a furnace at the bottom of the boiler.

Water tube boilers blow fire tube boilers away in regards to efficiency. The heat of the gases is transferred through the walls of the tubes by thermal conduction, heating the water and ultimately creating steam the firetube boiler developed as the third of the four major historical types of boilers. It is suitable for the production work like sugar mill, textile industries. That module discussed the differences between internally and externallyfired boilers, the hrt boiler, and the fourpass packaged boiler. Difference between fire tube boiler and water tube boiler with pdf. Operating pressure upto 100 bar efficiency upto 90% ste. Water tube boilers require far less water to function, and at the same time, they also have a higher rate of steam generation than fire tube boilers. Combi boiler and water heater mascot ft laars boiler. Mar 19, 2016 today i am going to tell you difference between fire tube boiler and water tube boiler. Packaged watertube boilers the bent tube watertube boiler is also produced as a packaged unit.

Mar 04, 2020 a water tube boiler is such kind of boiler where the water is heated inside tubes and the hot gasses surround them. There are many advantages of water tube boiler due to which. Sep 27, 2017 in this video i saw whats the difference between water tube boiler and fire tube boiler on the basis of construction, equipment, uses. The main differences between the fire tube and the water tube boiler are the hot gases flow inside the tube and water surround them in the fire tube boiler. What is difference between water tube boiler and fire tube boiler. This helps to reduce the amount of water and fuel necessary to make a water tube boiler run compared to the alternative option. From a design standpoint, water tube boilers and fire tube. Water tube and fire tube boiler is steam boiler classification which is categorized based on tube type.

Therefore, this boiler requires a large amount of heating surface and large grate area to burn coal at a rapid rate. Comparison between fire tube and water tube boiler can be done in aspects like efficiency, pressure operation, floor area, transportation, efficiency, etc. Meaning if the pressure drops on a fire tube boiler, it takes longer to come back up than on a similarly rated water tube boiler. Fire tube boiler vs water tube boiler explained in hindi. A fire tube boiler is a type of boiler in which hot gases pass from a fire through one or many more tubes running through a sealed container of water. A significant advantage of the watertube boiler is that there is less chance of a catastrophic failure. They generally operate at less than 300 psi and produce steam with moderate steam.

Types, combustion in boilers, performances evaluation, analysis of losses, feed water treatment, blow down, energy conservation opportunities. As their names imply, the firetube boiler has the fire combustion gases inside the tube and the watertube boiler has the water inside the tube. The basics of boiler water chemistry cleaverbrooks. One is known as fire tube boiler and the other one is known as water tube boiler. From a cold start, the firetube boiler, due to its larger water volume, takes longer to bring up to operating temperature or pressure vs. Boilers bureau of energy efficiency 27 syllabus boilers. Water circulates in tubes and heated externally by hot gases. The firetube boiler passes combustion gas inside a series of tubes surrounded by water in a vessel to produce steam, while a watertube instead. Boiler basics part 1 types and components hvac school. Two of the most common boiler types are fire tube and water tube. Advantage, disadvantage and application of fire tube boiler.

Vertical fire tube boiler it is the simplest fire tube boiler which consists of a cylindrical shell containing greater portion of water and remaining portion is occupied by steam. Jun 05, 2018 comparison between fire tube and water tube boiler can be done in 14 aspects. In water tube boilers, water and steam flow inside the tubes and the hot gases flow over the outside surface. Advantages and disadvantages of water tube boilers over fire tube boilers. Learn the basic pros and cons of watertube and firetube boilers. Totally reinventing fire tube technology from the ground up.

Apr 23, 2016 the difference between fire tube boiler and water tube boiler can be done on various points. Jan 05, 2018 difference between fire tube and water tube boiler. The boiler circulation system is constructed of tubes, headers, and drums joined in. The heat from the hot gases is conducted through the walls of the tube to the water. The steam generation rate in water tube boiler is high i. The fuel burns on the grate of the firebox in the boiler and the resultant hotflue gases are permitted to flow in the region of cross tubes. Our herostm industrial boilers are customengineered to each projects unique specifications. A fire grate is located at the fire box base as well as coal is firedup on the. Commonly water tube boiler is appropriate for significant gas streams going above enormous amounts of generated steam lbhr and also. Fire tube boiler construction and working principle of fire tube boiler. Water turns to steam when it comes into contact with sufficient heat. The module boiler design and terminology presented the basic firetube boiler design, as well as some specifics of firetube boilers. The fire tube boiler developed as the third of the. Fire tube boilers typically have lower operating and maintenance costs, have easier access to the fire and water sides for inspections, and its much easier to replace tubes on a fire tube than a water tube.

Dec 07, 2016 two of the most common boiler types are fire tube and water tube. The construction of a water tube boiler can be equipped with cylindrical shell, vertical, firebox in the base, space for water in the center segment, and space for steam in the higher segment. The water tube boiler generates more steam of high pressure whereas a fire tube boiler generates steam of low pressure. This is a boiler in which the fire or hot gas is present inside the tubes and water surrounds these fire tubes. For a given power the floor area required for the generation of steam in this boiler is less i. The inside and outside furnace walls, as well as the floor and roof, are constructed of tangent tubes. The package consists of a pressure vessel, base frame. Water tube boiler operation and types of water tube. Difference between fire tube and water tube boiler.

Hence water tube boilers can quickly generate steam at the required pressure than the fire tube boiler. Firetube boilers have easy access to the boilers firesides and tubes can easily be replaced without additional repair of the boiler. There are a number of considerations to factor when determining the best boiler for your steam generation needs like operating pressure, steam poundshour output, demand fluctuation, general application requirments and total cost of ownership, etc. In watertube boilers, the fluid with the higher density flows through the tubes and the fluid of lower density flows through a larger diameter external to the tubes combustion chamber, ultimately resulting in watertube boilers having higher overall heat transfer coefficient when compared to a firetube condensing boiler of the same size and. Difference between water tube boiler and fire tube boiler. In a firetube boiler, the heating element produces hot water through a more indirect mechanism. This means that there is faster response available to adapt to varying temperature conditions, i. A firetube boiler is a type of boiler in which hot gases pass from a fire through one or many more tubes running through a sealed container of water. Those aspects are operating pressure, passage of material type in tubes, rate of steam generation, handling of load fluctuation, floor area requirement, efficiency, operator skills, design, maintenance cost are listed below in the tabular form. Watertube boilers contain the water and steam inside a network of mud and steam drums plus the interconnecting bent water tubes. While in water tube boilers, water passes through tubes. The combustion gases after heating the water are allowed to escape into atmosphere 8. As stated earlier, all firetube boilers should be factory packages to include burner installation, fuel train piping, controls, boiler trim, and a full factory fire test to capacity on the fuels that will be.

Firetube boiler is those boiler in which the fire or hot gas is present inside the tubes and water surrounds these fire tubes. We will discuss the fire tube boiler, different types of firetube boilers, defects, and uses. The hot flue gases pass around and between the tubes, heating the water and then out the boiler vent. When purchasing a new boiler, you will have many different makes and models to choose from. Fire tube boiler date back to the industrial revolution, where they were used in steam engines, both for locomotives and industrial plants. Builtin hardware to connect a boiler system pump, 3 zone pumps or 3 zone valves. A firetube boiler is a boiler that combusts the fuel in a chamber and then passes the hot exhaust gasses through a series of tubes with water on the outside of them. Locomotive boiler is a horizontal fire tube type mobile boiler. Not like fire tube boilers, this boiler attains highpressures, as well as highsteam capabilities, can be achieved. Builtin hardware to connect a boiler system pump, 3 zone pumps or. A comparison between water tube and fire tube boilers. The heat of the gases is transferred through the walls of the tubes by thermal conduction, heating the water and ultimately creating steam. What is difference between water tube boiler and fire tube. Mostly used boiler in small and medium industries with different fuels and steam pressure requirements.

Difference between fire tube boiler and water tube boiler. Advantages and disadvantages of water tube boilers over. Difference between fire tube boiler and water tube boiler 20170628 17. In a water tube boiler, the water is in the tubes while the fire is external to the tubes. For instance, here is a typical boiler efficiency curve, and as you can see, the sweet spot is in the area of 6070%. Water tube boiler definition, components, working principle. Since fire is inside the tubes and hence it is named as fire tube boiler.

Fuel is burned inside the furnace, creating hot gas which heats water in the steamgenerating tubes. That is, the boiler, burner, draft fan, feed pump, controls, and other accessories are all included as a unit and supplied by the boiler manufacturer. The fire tube boiler is manufactured in massachusetts with the highest quality materials. Water tube vs fire tube boiler is comparison between two types boiler which is viewed from several aspects. Modern high capacity boilers are of water tube type. Comparison between fire tube and water tube boiler can be done in 14 aspects. Actually this boiler is just opposite of fire tube boiler where hot gasses are passed through tubes which are surrounded by water advantages of water tube boiler. The dry back boiler design uses a common rear tube sheet and features convenient fire side and water side access. The heat from the hot gases transfers through the walls of the tubes and heats the water. Water tube boiler water wall superheaters and furnace duration. As stated earlier, all firetube boilers should be factory packages to include burner installation, fuel train piping, controls, boiler trim, and a full factory fire test to capacity on the fuels that will be used in the field. The water volume in a watertube boiler is significantly less than what would be present in a fire tube boiler. In water tube boilers, the ratio of water content to the steam capacity is comparatively less than the fire tube boiler. To be noted, this accounts for wider capabilities in output ranges as well.

The heat energy from the gases passes through the sides of the tubes by thermal conduction, heating the water and ultimately creating steam. In fire tube boilers, hot flue gases will be flown inside the tube and these tubes are surrounded by water. The dryback boiler reversal chamber has a rear wall that is lined, or jacketed with refractory, which passes combustion gasses from the furnace to multiple tube sheets and reflects burner heat, resulting in exterior radiation losses. With less water volume, a watertube boiler can follow load swings more precisely and generally has better turndown. Actually this boiler is just opposite of fire tube boiler where hot gasses are passed through tubes which are surrounded by water. In smaller boilers, additional generating tubes are separate in the furnace, while larger utility boilers rely on the waterfilled tubes. This is because of condensed tangential pressure on tubes which is known as hoop stress. Due to the small tube diameter, a water tube boiler can operate at much higher pressures than a fire tube boiler, so they are often used in power. A water tube boiler is such kind of boiler where the water is heated inside tubes and the hot gasses surround them. How watertube boilers outperform firetube boilers miura boiler.