Fire tube boiler is those boiler in which the fire or hot gas is present inside the tubes and water surrounds these fire tubes. Difference between fire tube boiler and water tube boiler with pdf. The steam generation rate in water tube boiler is high i. Water tube boilers blow fire tube boilers away in regards to efficiency. Here is a question for the readers, explain the contrast between a fire tube boiler and a water tube boiler. How watertube boilers outperform firetube boilers miura boiler. 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. 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.
A comparison between water tube and fire tube boilers. Before understand that why water tube boiler are more preferred, we have to know something about water tube boiler and fire tube boiler. If the boiler is a steam boiler, the natural pressure created by the steam forces the steam to flow through the piping. Comparison between fire tube and water tube boiler can be done in aspects like efficiency, pressure operation, floor area, transportation, efficiency, etc. The water tube boiler may just result in a tube leak, which can be easily contained. They work by circulating hot gas through tubes, which in turn run through a water tank. The difference between fire tube boiler and water tube boiler can be done on various points.
These types of boiler are generally considered safer than fire tube designs and typically require less frequent maintenance. Scotch marine boiler plants can have one operator per shift that can effectively manage the operation of 4 or 5 boilers at a time. Since fire is inside the tubes and hence it is named as fire tube boiler. May 07, 2017 this video briefly describe fire tube boiler and 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. A boiler is a closed vessel in which steams are generated water to steam. 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.
What is difference between water tube boiler and fire tube boiler. These steam boilers consist of many types and classifications. It contains cross tubes and a furnace at the bottom of the boiler. The heat from the hot gases transfers through the walls of the tubes and heats the water. Compared with shellandpan boilers, watertube boilers have no large diameter shell in structure. Firetube boiler is those boiler in which the fire or hot gas is present inside the tubes and water surrounds these fire tubes. Difference between fire tube boiler and water tube boiler with pdf amrit kumar thermal engineering leave a comment. A water tube boiler is such kind of boiler where the water is heated inside tubes and the hot gasses surround them. Difference between fire tube and water tube boiler. One difference is the language used to size their output. 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. Fire tube boiler definition, construction, working.
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. This article elaborates on different types of boilers and the boiler classification. However, with less water present in a water tube boiler, if anything goes wrong, the explosion wont be anywhere near as serious as it would be in a fire tube boiler. 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. Operating pressure upto 100 bar efficiency upto 90% ste. The difference between fire tube boiler and water tube boiler depends on many factors. Packaged watertube boilers the bent tube watertube boiler is also produced as a packaged unit. Fire tube boiler generates less steam than water tube boiler. In water tube boilers, water and steam flow inside the tubes and the hot gases flow over the outside surface.
Locomotive boiler is a horizontal fire tube type mobile boiler. 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. 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. Some experiments found that a fire tube boiler can generate 18000 pounds 8164 kg steam per hour. Watertube and firetube boilers are essentially the opposite in design. One of the latest advances in steam boiler technology is the use of water tube boilers. The hot flue gases generated by the boilers combustion are channeled into tubes and routed through a water tank, and the heat transfer from these firetubes creates the needed hot water or steam. Small amount of boiler water drawn off near surface continuously or intermittently function is to control concentration of dissolved solids. Efficiency of the water tube boiler is more than that of fire tube and lies within the range of 85 to 90 %. The furnaceflame volume can either be inside or external to the shell that contains the water. 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. This is a boiler in which the fire or hot gas is present inside the tubes and water surrounds these fire tubes. In a fire tube boiler, the water surrounds a set of tubes through which the fire and the products of combustion travel as opposed to a. 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.
All of this is contained in a large, insulated, and sometimes gas tight enclosure. Fire tube boiler advantage, disadvantage and application. 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. These tubes run through the water vessel and heat the water via convection. Instead of having vertical metal tubes filled with water, a firetube boiler has horizontal tubes filled with heat from the burner flames. Generally, the kind of boiler to be utilized for a specific condition is established by the practical knowledge of the boiler maker. Fire tube boiler vs water tube boiler explained in hindi. Which is better fire tube boiler or water tube boiler. In the general scheme of things you would never apply a fire tube design scotch marine to a high pressure steam requirement.
Comparison between fire tube and water tube boiler can be done in 14 aspects. Why is a water tube boiler more prepared than a fire tube. Fire tube boiler vs water tube boilercomparison of boiler. Water tube boilers are more efficient than fire tube boilers, generating more steam but using less fuel. 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. Water tube and fire tube boilers are complete opposites in terms of the location of the water relative to the hot gases resulting in water tubes boilers being inherently more efficient in terms of the heat transfer.
Jun 05, 2018 comparison between fire tube and water tube boiler can be done in 14 aspects. With less water volume, a watertube boiler can follow load swings more precisely and generally has better turndown. It is suitable for the production work like sugar mill, textile industries. 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. A high pressure watertube boiler also spelled water tube and water tube is a type of boiler in which water circulates in tubes heated externally by the fire. 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. These units have water cooled furnaces, and the air for combustion is supplied.
The distinction between fire tube boiler and water tube boiler should be possible on different focuses. Dec 07, 2016 two of the most common boiler types are fire tube and water tube. How water tube type steam boilers work miura boiler. The hot flue gases generated by the boilers combustion are channeled into tubes and routed through a water tank, and the heat transfer from these firetubes creates the needed hot water or. Water tube vs fire tube boiler is comparison between two types boiler which is viewed from several aspects. Jun 10, 2017 special features of 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. 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.
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. The dry back boiler design uses a common rear tube sheet and features convenient fireside and waterside access. Jan 05, 2018 difference between fire tube and water tube boiler. Aug 30, 2019 thus, in this article, we have learned what is a fire tube boiler, different mountings, and accessories used for its operation, different types of fire tube boilers, advantages, and disadvantages. The dry back boiler design uses a common rear tube sheet and features convenient fire side and water side access. 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. Commonly water tube boiler is appropriate for significant gas streams going above enormous amounts of generated steam lbhr and also can certainly manage high.
Fire tube boiler have lower rate of steam production compare to water tube. In a firetube boiler, the heating element produces hot water through a more indirect mechanism. Watertube plants will have 5 or 6 people per shift to operate one or two boilers. In the true, engineering sense there is no pro or con or competition between the water tube boiler design and the fire tube boiler design. 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. Watertube boilers contain the water and steam inside a network of mud and steam drums plus the interconnecting bent water 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 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. Water turns to steam when it comes into contact with sufficient heat. 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. In smaller boilers, additional generating tubes are separate in the furnace, while larger utility boilers rely on the waterfilled.
From explanation above comparison between water tube vs fire tube boiler can be known. In smaller boilers, additional generating tubes are separate in the furnace, while. Watertube or firetube condensing boiler, which is the. When this boiler was invented at that time it was a popular boiler for a different sector. The watertube boiler may just result in a tube leak, which can be easily contained. Water tube boiler operation and types of water tube boiler. This is because of condensed tangential pressure on tubes which is known as hoop stress. Fire tube steam boiler nationwide boiler nationwide. In that time wood, saw dust and cola were used to burn to supply heat to the boiler. Each fits an application or niche that the engineer specifies or identifies. The main requirement of this boiler is that it should produce steam at a very high rate. The different types of boilers find their use in different applications. For instance, here is a typical boiler efficiency curve, and as you can see, the sweet spot is in the area of 6070%.
The firetube boiler passes combustion gas inside a series of tubes surrounded by water in a vessel to produce steam, while a watertube instead. Water tube boilers have the high evaporating capacity 20,000 to 40,000 kgh compared with other boilers. These focuses incorporates sorts of liquid streams inside the cylinders, steam age rate, floor zone required for the steam age, transportation, proficiency, fluctuating burdens, working expense and so forth the learning of the distinction about these two heater is exceptionally. Water tube boiler operation and types of water tube. The upper steam capacity of fire tube boilers is about 20,000 ibmhr, and the peak pressure. 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 advantage, disadvantage and application of. If low water level established in the boiler never add water into the boiler right away. Fire tube boiler date back to the industrial revolution, where they were used in steam engines, both for locomotives and industrial plants. These boilers are suitable for clean fuels such as oil and gas. Fire tube boiler is the most predominant boiler used for heating, commercial and industrial applications. Two of the most common boiler types are fire tube and water tube. 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.
Todays lessons will be discussed about difference between fire tube boiler and water tube boiler that means fire tube boiler vs 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. 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. In a watertube boiler, the water is in the tubes while the. One is known as fire tube boiler and the other one is known as wate. 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. 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. Fire tube boiler vs water tube boiler explained in hindi mech learn. Difference between fire tube boiler and water tube boiler 20170628 17. The defective tubes in water tube boilers can be identified and replaced easily.
Differences between fire tube boiler and water tube boiler. A steam boiler is a closed vessel, generally made of steel, in which water is heated by some source of heat produced by combustion of fuel and ultimately to generate. Water circulates in tubes and heated externally by hot gases. Locate and rectify the fault, wait until the boiler has cooled down. Boilers can be broadly classified as shell tube and water tube boilers. With less water volume, a watertube boiler can follow load swings more. 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. 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.
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. This helps to reduce the amount of water and fuel necessary to make a water tube boiler run compared to the alternative option. As the time has passed, more efficient types of boilers have replaced the old and inefficient ones. In a watertube boiler, water travels through tubes which are surrounded by the byproducts of. 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. Therefore, this boiler requires a large amount of heating surface and large grate area to burn coal at a rapid rate. Watertube boilers are most commonly rated or sized in pounds per hour pph of steam they produce.
Occasionally a collaboration of water and fire tube boilers is applied to match exceptional demands. From a design standpoint, water tube boilers and fire tube. Apr 23, 2016 the difference between fire tube boiler and water tube boiler can be done on various points. 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. The tubes connect to a steam drum and a mud drum, and steam is produced in the upper drum. From a cold start, the firetube boiler, due to its larger water volume, takes longer to bring up to operating temperature or pressure vs. What is difference between water tube boiler and fire tube. Materials requirements to build the boiler for ultimate energy freedom. 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.
Difference between fire tube boiler and water tube boiler. For a given power the floor area required for the generation of steam in this boiler is less i. Two primary boiler types, the firetube boiler and the watertube boiler, are essentially opposite in design. Water tube boiler definition, components, working principle.
The hot combustion gases used to heat the water circulate outside these tubes. Actually this boiler is just opposite of fire tube boiler where hot gasses are passed through tubes which are. Because miura only has a tenth of the water volume and all the water is within the tubes, explains brandon hargett of boiler masters inc. 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. 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. Industrial boilers mainly can be classified as a fire tube and water tube boilers. The boiler circulation system is constructed of tubes, headers, and drums joined in arrangement that provide water flow to generate steam. Not like fire tube boilers, this boiler attains highpressures, as well as highsteam capabilities, can be achieved. This video contains the difference between fire tube boiler and water tube boiler. Firetube boiler emergencies a when the boiler is steaming with water level not visible in the gauge glass, shut off the burner immediate1y. Feb 19, 2015 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. It is supported by a steel structure at a certain height and is independent of brickworks.
Water tube and fire tube boiler is steam boiler classification which is categorized based on tube type. Firetube boilers contain the combustion gases in straight tubes and the combustion chamber while the water and steam circulate outside these tubes. This type of boiler is distinct from conventional fire tube boilers. In a watertube boiler, water flows through the tubes, which surround the furnace and convection areas fired by the burner. Fuel is burned inside the furnace, creating hot gas which heats water in the steamgenerating tubes. The size of the boiler drum is small as compared with the boiler drum of. A water tube boiler runs off of water tubes that are heated externally by fire. The heat from the hot gases is conducted through the walls of the tube to the water. A boiler in which flames and hot gases produced during combustion pass through the tubes and water flowing outside the tube called fire tube boilers. 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. Competitive exam questions for mechanical engineers mechanical engineering says. These units have watercooled furnaces, and the air for combustion is supplied.