A fire tube boiler transfers heat through tubes via thermal conduction, which then heats the water in the container and formulates steam. Inside water wall n totally new design industrial grade construction, 2 pass fire tube design with enhanced heat transfer features. Unlike fire tube boiler, where the hot gas is circulated through tubes to heat water in a tank, water tube boilers involve running water through tubes surrounded by a heated tank. Hence water tube boilers can quickly generate steam at the required pressure than the fire tube. Comparison between fire tube and water tube boiler can be done in 14 aspects. Firetube boilers have the advantage of being easy to install and operate. Differences between fire tube boiler and water tube boiler. A combination fire tube and water tube boiler comprising. Contrary to smoke tube boilers, water tube boilers are that in which water circulates in tubes. 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.
Fire tube boiler parts explained learn about the working of. 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. Fire tube boiler is the simplest form of the internal furnace, vertical fire tube boiler. I was always unsure of the difference but this helps a lot, thank you. Fire tube boiler parts explained learn about the working.
Fire tube boilers, typically have a lower initial cost, are more fuel efficient. The main feature of the boiler is that the furnace of the boiler is surrounded by water and therefore there is no requirement of refractory material. Difference between fire tube boiler and water tube. 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.
Firetube boilers are also used in steam locomotives. The waterside surfaces of steam boilers are vulnerable to corrosion when air contacts moist metal surfaces during outofservice periods. Fire tube boiler and water tube boiler comparison 20161109 14. Operating pressure upto 100 bar efficiency upto 90% ste. The efficiency of the fire tube boiler is less as compared to. Before moving to further detailed explanation lets have some overview of fire tube and water tube boiler. 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. This type of boiler is composed of a shell and a series of tubes designed to transfer heat from the fire tubes and into boiler feedwater. Difference between fire tube boiler and water tube boiler fire tube. Describe the procedures for cleaning boiler firesides and watersides. The use of plastic pipe or dielectric unions may isolate the boiler electrically.
From table 1 it can be seen to be the second most common cause of failure in the sample of fire tube boilers. They are differ from not only structure, but also usage. Where as in fire tube boilers hot gases from combustion travels through the tubes. In water tube boilers, the ratio of water content to the steam capacity is comparatively less than the fire tube boiler. In this work, the modeling of the heat transfer between flue gas and water in a firetube boiler is considered. The upper steam capacity of fire tube boilers is about 20,000 ibmhr, and the peak pressure.
In the literature, a comprehensive modeling for fire tube boilers has not been treated. Vertical firetube 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. Bcit power engineering, maintenance midterm 120 terms. Mar 04, 2020 fire tube boiler is one of the most basic types of boiler and the design is also very old. Difference between fire tube boiler and water tube boiler thermodyne engineering systems free download as pdf file. The main requirement of this boiler is that it should produce steam at a very high rate. One is known as fire tube boiler and the other one is known as water tube boiler. 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. Installation and operating instructions firetube water. Types, combustion in boilers, performances evaluation, analysis of losses, feed water treatment, blow down, energy conservation opportunities. When choosing between a water tube or fire tube boiler, it would be better to consult a professional. Difference between fire tube and water tube boiler.
When choosing between a water tube or fire tube boiler, it would be better to consult a. Difference between water tube boiler and fire tube boiler. Fire tube boiler operation and types of fire tube boiler. Boilers bureau of energy efficiency 27 syllabus boilers. Competitive exam questions for mechanical engineers mechanical engineering says. As reported by yates 1999 somewhere between 8% and 12% of fire tube boilers in the uk have been found to be affected. Boiler, boiler types, fire tube boiler, water tube boiler. What is difference between water tube boiler and fire tube boiler. 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. Thank you for listing out the differences of fire tube boilers and water tube boilers. Jun 05, 2018 comparison between fire tube and water tube boiler can be done in 14 aspects.
It is 100% water backed and built for years of reliable service. The round flanged vertical smoke outlet is equipped with a locking quadrant damper. Fuel is burned inside the furnace, creating hot gas which heats water in the steamgenerating tubes. One is the scotch marine boiler, which consist of a cylindrical shell which length is lass as compare to its diameter having one or two combustion chambers and large no of fire tubes. We briefly discuss about water tube boiler parts and functions. The hot gases produced in the furnace then passes through the fire tubes. Steam boiler working principle and types of boiler. Fire tube and a vertical water tube boiler, at the washington navy yard, to ascertain their relative economic vaporizations with different kinds of coal. What is difference between water tube boiler and fire tube. Fuel is burned inside the furnace, creating hot gas which heats. The combination fire tube and water tube boiler of claim 1, further characterized by a second fire tube boiler between the steam and mud drums and also connected therewith to provide for natural circulation of the recipient fluid medium to and from the steam drum in indirect heat transfer relation with hot gaseous high. Fire tube boiler fire tube boiler consists of boiler shell which is filled with water and perforated with tubes, there are different configurations of these tubes but horizontal configuration is the common one. 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. Firetube boiler 1800 the fire tube boiler, the oldest design, is made so the products of combustion pass through tubes surrounded by water in a shell.
Fire tube boiler is one of the most basic types of boiler and the design is also very old. These points includes types of fluid flows within the tubes, steam generation rate, floor area required for the steam generation, transportation, efficiency, fluctuating loads, operating cost etc. One difference is the language used to size their output. These units have watercooled furnaces, and the air for combustion is supplied. The boilerheater must be electrically grounded in accordance with the most recent edition of the national electrical code, ansinfpa 70. Advantages and disadvantages of water tube boilers over fire tube boilers. Operation of fire tube boiler is as simple as its construction.
In this video i saw whats the difference between water tube boiler and fire tube boiler on the basis of construction, equipment, uses. It contains cross tubes and a furnace at the bottom of the boiler. What the inspector looks for when inspecting a boiler. Dec 07, 2016 unlike fire tube boiler, where the hot gas is circulated through tubes to heat water in a tank, water tube boilers involve running water through tubes surrounded by a heated tank. Hence water tube boilers can quickly generate steam at the required pressure than the fire tube boiler. In smaller boilers, additional generating tubes are separate in the furnace, while larger utility boilers rely on the waterfilled tubes. The steam rating in fire tube boilers doesnt exceed 2500 kg per hour and pressure is limited to 10 bars. The difference between fire tube boiler and water tube boiler can be done on various points. The furnaceflame volume can either be inside or external to the shell that contains the water. Smoke tube boiler, as its name suggests, of which smoke or heat flowing through boiler tubes and the water surrounds outside of the tubes to be heated and turned into steam.
These steam boilers consist of many types and classifications. A vertical firetube boiler or vertical multitubular boiler is a vertical boiler where the heating surface is composed of multiple small firetubes, arranged vertically these boilers were not common, owing to drawbacks with excessive wear in service. Normal efficiency of the fire tube boiler is about 80 to 85 % but this can be increase or decrease by using different a accessories. The steam generation rate in fire tube boiler is low, i. In the water tube boiler, the water and steam flow inside the tubes and the hot gases flow over the outside surfaces. A vertical fire tube boiler or vertical multitubular boiler is a vertical boiler where the heating surface is composed of multiple small fire tubes, arranged vertically. Each of them has its own advantages and disadvantages. In this work, the modeling of the heat transfer between flue gas and water in a fire tube boiler is considered. Packaged watertube boilers the bent tube watertube boiler is also produced as a packaged unit. 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. Excluding air from the boiler by filling it with properly treated. Nov 24, 2016 fire tube boiler is the simplest form of the internal furnace, vertical fire tube boiler. Water circulates in tubes and heated externally by hot gases.
The module boiler design and terminology presented the basic firetube boiler design, as well as some specifics of firetube boilers. Describe the different types of boiler fittings and accessories. That module discussed the differences between internally and externallyfired boilers, the hrt boiler, and the fourpass packaged boiler. Three pass fire tube boiler and waste heat recovery boiler are the common smoke tube steam boiler. The furnace can be enclosed on its sides with a water cooled jacket or it may be made up of masonry. They are high pressure boilers and the operating pressure is about 165 bar. Compared with shellandpan boilers, watertube boilers have no large diameter shell in structure. The comparison between two boilers namely water tube as well as fire tube mainly includes working pressure, material type, the rate of steam production, the requirement of floor area, efficiency, load handling variation, design, operator skills, the cost for maintenance are discussed below. The main difference between fire tube and water tube is that in fire tube boiler the flue gases flow in the tubes and water flows from the shell and in water tube boiler, water flows from the tubes and the flue gases from the shell or passes over the tubes. This video briefly describe fire tube boiler and water tube boiler. Identify the automatic controls associated with boilers. 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 whereas, in the water tube, water flows inside the tube and hot gases surround them. The heat of the gases is transferred through the walls of the tubes by thermal conduction, heating the water and ultimately creating steam.
Fire tube boiler article about fire tube boiler by the. These are the main two types of boiler but each of the types can be sub divided into. It is 100% waterbacked and built for years of reliable service. Do not rely on the gas or water piping to ground the metal parts of the boiler. 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. Firetube boiler a cylindrical steam boiler with fire tubes extending inside the water area of the boiler from one end plate to the other. 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.
They are widely used in small installations to heat buildings and to provide power for factory processes. The water side surfaces of steam boilers are vulnerable to corrosion when air contacts moist metal surfaces during outofservice periods. Firetube boiler definition is a boiler in which water surrounds the tubes through which hot gases pass from the furnace to the stack. Locomotive boiler is a horizontal fire tube type mobile boiler.
Press the tube through the water or gas can be divided into categories. Firetube and a vertical watertube boiler, at the washington navy yard, to ascertain their relative economic vaporizations with different kinds of coal. Fire tube boiler article about fire tube boiler by the free. 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. Water tube boiler water wall superheaters and furnace duration. In fire tube boiler, the fuel is burnt inside a furnace. In other words, the boiler is the pressure vessel that contains the water. Therefore, in order to prevent corrosion, the boiler waterside surfaces must be protected by. Difference between fire tube boiler and water tube boiler 20170628 17. 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. Mar 04, 2020 in fire tube boiler, there are numbers of tubes through which hot gases are passed and water surrounds these tubes. The advantages of a firetube boiler are its simple construction and less rigid water treatment requirements. Describe the procedures associated with boiler water treatment and cleaning. Water is partially filled in the water tank and volume is left inside the tank to accommodate the steam.
Clickpress, tue aug 28 2018 the report steam boiler system market by component boiler, economizer, superheater, air preheater, and feed pump, type watertube boiler, and fire tube boiler, fuel coal, gas, biomass, oil, and electric, enduser, and region global forecast to 2023, the steam boiler system market is expected to grow from an estimated usd 17. The firetube boiler passes combustion gas inside a series of tubes surrounded by water in a vessel to produce steam, while a watertube. Therefore, in order to prevent corrosion, the boiler water side surfaces must be protected by. This video contains the difference between fire tube boiler and water tube. The vix series can offer higher efficiencies than standard vertical boilers. Advantages and disadvantages of water tube boilers over. In the firetube boiler, gases of combustion pass through the inside of the tubes and water surrounding the outside of the tubes. Jan 05, 2018 difference between fire tube and water tube boiler. Firetube boiler definition of firetube boiler by merriam. These units have water cooled furnaces, and the air for combustion is supplied. Smoke tube boiler and water tube boiler are the main types of industrial boiler in global market. In a watertube boiler, the heating element acts directly on tubes filled with water, which run through the furnace casing, to produce the needed steam or superhot water.
In a firetube boiler, the heating element produces hot water through a more indirect mechanism. Due to its shape the boiler is also known as spheroid. Water tube boiler is reverse of the fire tube boiler. Vertical this type of boiler is a onepass boiler with the furnace at the bottom and tubes running between the lower and upper tube sheets. Fire tube boiler definition, construction, working. These types of boiler are generally considered safer than fire tube designs and typically require less frequent maintenance. The combustion gases after heating the water are allowed to escape into atmosphere 8. The top tube sheet in a steam boiler can be above or below the water line. This type of boiler is composed of a shell and a series of tubes designed to transfer. This boiler is also called fire tube boiler, fire tube shell boiler. Hurst scotch marine boilers are rated to 81% minimum efficiency.
A significant advantage of the watertube boiler is that there is less chance of a catastrophic failure. The tubes connect to a steam drum and a mud drum, and steam is produced in the upper drum. Difference between fire tube boiler and water tube boiler scribd. The more common form of vertical boiler, which was very similar in external appearance, instead used a single flue and waterfilled crosstubes. 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. Fire tube boilers are a portable boiler and it requires a small floor space. Advantages and disadvantages of water tube boilers over fire. Difference between fire tube boiler and water tube boiler. Our twopass, threepass or fourpass scotch marinefire tube boilers are available in dryback, wetback, steam or hot water versions. An account of the experiments made by chief engineers loring and baker, 1l s. The national board of boiler and pressure vessel inspectors. Water tube boiler have higher rate of steam production compare to fire. Watertube boilers are most commonly rated or sized in pounds per hour pph of steam they produce.
Difference between fire tube boiler and water tube boiler with pdf. A water tube boiler runs off of water tubes that are heated externally by fire. Fire tube boiler 1800 the fire tube boiler, the oldest design, is made so the products of combustion pass through tubes surrounded by water in a shell. Therefore, this boiler requires a large amount of heating surface and large grate area to burn coal at a rapid rate. In order for an individual to gain access to a boiler through a manhole, there must be a confined space entry permit procedure in place for proper and safe entry.