It was very nicely explained the difference between two boiler methods with the example of apple and orange i. This is because of condensed tangential pressure on tubes which is known as hoop stress. A comparison between water tube and fire tube boilers. An account of the experiments made by chief engineers loring and baker, 1l s. On todays episode of the boiling point, gerald and ritchie address a topic that ware gets a lot of questions aboutthe difference between wetback and dryback boilers. Difference between water tube boiler and fire tube boiler. In power boilers, the tube sheets, drum, tubes, and all boiler fittings will be of heavier design and construction to. The main difference between fire tube and water tube is that in fire tube boiler the flue gases flow in the tubes and water. The only railway use of water tube boilers in any numbers was the brotan boiler, invented in austria in 1902 by johann brotan and found in rare examples throughout europe. 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 type of tube construction used in these three boilers affects the boiler construction. Difference between fire tube boiler and water tube boiler with pdf. In firetube boilers, the combustion gases pass inside boiler tubes, and heat is transferred to water between the tubes and the outer shell.
The efficiency of a firetube boiler is not a mysterious calculation. What is difference between water tube boiler and fire tube boiler. Firetube and a vertical watertube boiler, at the washington navy yard, to ascertain their relative economic vaporizations with different kinds of coal. In a water tube boiler, it contains a minimal amount of water at any given time. The main difference between firetube boilers and watertube boilers is explained by their names. Learning objectives here is what you will be able to do when you complete each objective. This article elaborates on different types of boilers and the boiler classification. For general comparisons firetube boilers run between 100,000 btuft3 to. Actually this boiler is just opposite of fire tube boiler where hot gasses are passed through tubes which are surrounded by water. Describe the purposes, equipment and operation of continuous and intermittent blowdown. 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. Precision firetube water boilers and heaters are covered by a limited warranty. In a watertube boiler, it contains a minimal amount of water at any given time.
The exception is when a boiler is closed and prepared to be filled with water and water treatment chemicals. Mostly it depends upon the people for which they mostly prefer. Plant theory chapter 52 firetube boilers flashcards quizlet. What is difference between water tube boiler and fire tube. 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. Boilers that operate higher than 15 psig are called highpressure boilers. The firetube boiler passes combustion gas inside a series of tubes surrounded by water in a vessel to produce steam, while a watertube.
Actually this boiler is just opposite of fire tube boiler where hot gasses are passed through tubes which are. Boilers are thermal energy equipment widely used in industrial production. Installation and operating instructions firetube water. The difference between fire tube boiler and water tube boiler. Both are shell and tube type of boiler, fire tube have hot gases inside the tube while water tube have water inside the tube and hot gases surrounding them.
Because the tubes will move as they heat and cool, open spaces will develop between steam and water drum. Firetube boilers have easy access to the boilers firesides and tubes can easily be replaced without additional repair of the boiler. However, from a manufacturing standpoint, firetube boilers are typically lower in cost than a comparable sized watertube boiler, the firesides are easier to clean, and the straight firetubes are easily replaceable. The main difference is in the mechanism for producing steam.
Their size is also larger and have a faster recovery time. Distinguish between the terms blowdown and blowoff with respect to boilers. Compared with shellandpan boilers, watertube boilers have no large diameter shell in structure. 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. Hot water boilers above 160 psi hydrostatic pressure and or 2500 f outlet temperature section iv low pressure steam boilers less than 15 psi. Forward todays process and heating applications continue to be powered by steam and hot water. A firetube boiler is a boiler in which hot gases of combustion pass through the boiler tubes and comparison between fire tube and water tube boiler may 7, 2016 comparison between fire tube and water tube boiler can be done in 1, in firetube boilers hot flue gases pass through tubes and water. The feature that makes watertube boilers so much safer is the volume of water contained. They are identified by the type of reversal turnaround chamber, or posterior portion of the combustion chamber, through which flue gasses travel through the furnace to secondpass tubes to heat water within the boiler. Mar 19, 2016 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. Difference between fire tube boiler and water tube boiler.
Reviewing some basic design differences from one boiler to. Fire tube boiler definition, construction, working. Difference between fire tube boiler and water tube boiler structure. 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. The fire tube boiler developed as the third of the four major historical types of boilers. Water tube boilers are known to be safer than their fire tube counterparts from an operational standpoint. As near to 220 bara density difference between water an. Lets not forget that there is a tremendous difference in water volume between a firetube boiler and a watertube boiler.
The watertube boiler differs from the firetube design in that the tubes contain water rather than combustion gases. These types of boiler are generally considered safer than fire tube designs and typically require less frequent maintenance. Their advantage over flued boilers with a single large flue is that the many small tubes. Boilers that use a tangent tube wall see figure 4 to define the combustion chamber and outer walls will require an outside, gastight, enclosure.
How the natural circulation is achieved in boiler by. What is difference between water tube boiler and fire water tube boiler. Advantage, disadvantage and application of fire tube boiler. When the user selects the boiler, the performance of the two boilers is unclear, which. Operating pressure upto 100 bar efficiency upto 90% ste. Apr 23, 2016 the difference between fire tube boiler and water tube boiler can be done on various points. The wet back boiler design uses separate tube sheets between tube passes which can be more forgiving with load changes. Jun 05, 2018 comparison between fire tube and water tube boiler can be done in 14 aspects. Goes heating systems of houston, austin, and san antonio is a manufacturers representative of hurst boiler company for firetube boilers such as scotch marine firetube boilers packaged steam and water firetube boilers. Jul 05, 2016 water tube boiler and fire tube boilerdifference learn and grow. Start studying plant theory chapter 52 firetube boilers.
The heat from the hot gases is conducted through the walls of the tube to the water. As a onepass boiler design, vertical fire tube boiler has the furnace on the bottom. In a watertube boiler, water is sent through a combustion gassurrounded tube system that transfers heat energy into steam. May 16, 2016 on todays episode of the boiling point, gerald and ritchie address a topic that ware gets a lot of questions aboutthe difference between wetback and dryback boilers. Water circulates in tubes and heated externally by hot gases. Before moving to further detailed explanation lets have some overview of fire tube and water tube boiler. Since fire is inside the tubes and hence it is named as fire tube boiler. Boiler types and classifications wiki odesie by tech. Water tube boiler and fire tube boilerdifference learn and grow. Some manufacturers hold the ratio steady across their line while others let the ratios vaty and become very high with the larger boilers. Comparison between fire tube and water tube boiler can be done in aspects like efficiency, pressure operation, floor area, transportation, efficiency, etc. 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. The fact is there are key feature differences between firetube boilers. Fire tube boiler advantage, disadvantage and application.
A water tube boiler runs off of water tubes that are heated externally by fire. The difference between water pressure and water flow. Victory energy, the new global standard for industrial. Difference between fire tube boiler and water tube.
The difference between wetback and dryback boilers the. Water tube boiler operation and types of water tube. High efficiency is the result of tangible design considerations incorporated into the boiler. We have hundreds of watertube boilers in operation worldwide. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Most decisions come down to two different types of boilers. 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. Watertube boilers are known to be safer than their firetube counterparts from an operational standpoint. Hot water boilers above 160 psi hydrostatic pressure andor 2500 f outlet temperature. 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. 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.
Hotwater boilers that have temperatures above 250 fahrenheit or pressures. In a firetube boiler, water surrounds the furnace and tubes that house the flame and hot gases. How can more heat exchange occur between the boiler water and the flue gasses. As the time has passed, more efficient types of boilers have replaced the old and inefficient ones. This may be prevented by installing an expansion tank or by providing a relief valve on the makeup line set at a lower pressure than the heater relief valve. Fire tube steam boiler nationwide boiler nationwide. 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. These boilers were an integral part in leading the way in the industrial revolution starting in the 1860s. 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. A major difference between firetube and watertube boilers is that the firetube boiler has a much larger water and steam content for any given. Firetube boilers contain the combustion gases in straight tubes and the combustion chamber while the water and steam circulate outside these tubes. Not like fire tube boilers, this boiler attains highpressures, as well as highsteam capabilities, can be achieved.
Firetube boilers normally range in size from 15 to 2,200 horsepower as a package with design pressures between 15 and 250 pounds for steam and between 30 and 160 pounds for hot water. In the watertube boiler, the combustion gases travel over the outside surfaces of the tubes and transfer their heat to the water within the tubes. Although there are only a limited number of firetube boilers in use in the sugar industry it was felt that seriousness of the failure mechanisms warrants their inclusion in this paper. 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. Because of its similarities in many ways to a steam boiler, the term hot water boiler is used. Wetback firetube boilers offer a more optimal functional footprint, with lift off or splithinged doors that require no cooldown period and can be opened immediately. Convection tubes steam dome tube sheet stack water line note.
The fundamental difference between these boiler types is which side of the boiler tubes contain the combustion gases or the boiler water steam. Like the baldwin, this combined a water tube firebox with a fire tube barrel. Difference between fire tube boiler and water tube boiler 20170628 17. Differences between fire tube boiler and water tube boiler. The difference between wetback and dryback boilers. Victory energy manufactures a full line of industrial watertube boilers. The fundamental difference between these boiler types is which side of the boiler tubes contain the combustion gases or the boiler watersteam. The tubes run between the upper and lower tube sheets. Difference between fire tube boiler and water tube boiler thermodyne engineering systems free download as pdf file. Feb 19, 2015 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. The different types of boilers find their use in different applications. Suited for all industrial and institutional applications. In fact, multipass firetube boilers are not usually used for hot water applications today because of this issue.
The difference between the two is that the water tube boilers are safer and last much longer than the fire tube boiler. With this type of design, the furnace may be comprised of masonry or enclosed on its sides with a watercooled jacket. Feb 08, 2018 natural circulation is achieved through the difference in the density of water and steam. 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.
A water tube boiler is such kind of boiler where the water is heated inside tubes and the hot gasses surround them. 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. Water tube boiler operation and types of water tube boiler. 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. Comparison between fire tube and water tube boiler can be done in 14 aspects. 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. For general comparisons firetube boilers run between 100,000 btuft3 to 120,000 with some above 220,000 btuft3. Difference between fire tube boiler and water tube boiler scribd.
Firetube boilers are available in either dryback or wetback design. This video briefly describe fire tube boiler and water tube boiler. Watertube or firetube condensing boiler, which is the. Difference between smoke tube and water tube boiler. Hungary, though, was a keen user and had around 1,000 of them. Because the facts say there is a difference between boilers and. 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.
The tubes connect to a steam drum and a mud drum, and steam is produced in the upper drum. This video contains the difference between fire tube boiler and water tube. This is a boiler in which the fire or hot gas is present inside the tubes and water surrounds these fire tubes. Split according to the flowing medium inside the boiler, it can be divided into water tube boiler and fire tube boiler. Bringing the latest innovation that delivers the most efficient steam boiler on the market. Describe the equipment and processes involved in continuous blowdown. A hot water boiler, strictly speaking, is not a boiler. Efficiency of the water tube boiler is more than that of fire tube and lies within the range of 85 to 90 %. The main difference between fire tube and water tube boiler are, fire tube boiler are internally fired and water tube boiler are externally fired boiler.
This is the most comprehensive guide on comparison or differences between fire tube boiler and water tube boiler. Smoke tube boiler water tube boiler 1 overall efficiency is about 8085%. These firetube boilers could weigh up to 200,000lbs and reach speeds of 100mph. Boiler types and classifications wiki odesie by tech transfer. The only railway use of watertube boilers in any numbers was the brotan boiler, invented in austria in 1902 by johann brotan and found in rare examples throughout europe.
The difference between fire tube boiler and water tube boiler can be done on various points. Here are the 15 points on differences between fire and watertube boiler. Difference between fire tube boiler and water tube boiler fire tube. Like the baldwin, this combined a watertube firebox with a. Along with an economizer, the overall efficiency can reach up to 8590%. Fire tube and a vertical water tube boiler, at the washington navy yard, to ascertain their relative economic vaporizations with different kinds of coal.
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