Steam boiler working principle and types of steam boiler. Cochran boiler is a fire tube boiler fire inside the boiler and water surrounding to them in which coal or gases as a working fluid is used, for generating the steam and that steam further used for several purposes. Construction and working principle of cornish boiler online. Should be absolutely reliable,capable of producing. Fire tube boiler construction, types and its working. Water tube boiler operation and types of water tube boiler. All the composite boilers are based on firetube boiler designs. Boiler terminology shell in cylindrical form one or more steel plates riveted or welded together setting it is made of brick work to form wall for the furnace and to confine the heat to the boiler some type of boilers, it is used as support grate platform on which fuel is burnt made of cast iron in the form of bars. It consists of a cylindrical shell with its crowns having a spherical shape. Babcock and wilcox boiler is a horizontal shell, multitubular, water tube. In this article, we will study definition, parts, construction, working principle, advantages, disadvantage, application, notes with pdf of cochran boiler. It has only one internal flue tube inside the boiler and diameter of the flue tube is 0.
Locomotive boiler construction working and application with diagram. To study the working and construction of high pressure boiler. In water tube boiler,water is circulated inside the tubes which are surrounded by flames or hot gases. Free steam boilers training videos water tube and fire tube boilers, babcock and wilcox boilers. Oct 27, 2020 bend tube boiler or sterling boiler is the developed version of water tube boiler. The cochran three pass, wetback boiler is renowned for its reliability and durability, as well as its robust design. It is used to control the flow of steam from the boiler to the main steam pipe and to shut off the steam completely when required. All steam boiler designs are avail from 6 to 28 bar.
Retarders are often fitted in these tubes, which increase the stay time of flue gases, this increasing the heating surface through which fuels energy heat is transfer to the water. Its easy to operate this boiler and it required less maintenance. Water tube boiler operation and types of water tube. The fuel is burnt on the grate and ash is collected and disposed of from ash pit. To save room, boilers which have to make steam very quickly and at high pressures are largely composed of pipes. Another form used horizontal firetubes, even where this added complexity, such as the cochran boiler. The various main parts of babcock and wilcox boiler are as follows 1. Babcock and wilcox boiler was discovered by george herman babcock and stephen wilcox in the year 1967 this is a water tube boiler, used in steam power plants. This boiler delivers to site as a whole package factory assembled. Cochran boiler consists of a cylindrical shell with a dome shaped top where the space is provided for steam. The flue gases flows through the fire tube, situated inside the boiler shell, so it is a fire tube boiler.
This boiler needs more ground because of its horizontal structure. The fire door the fuel is supplied to grate where it is burnt. The furnace is one piece construction and is seamless. Its function is to transfer the heat produced by the combustion of fuel solid, liquid or gaseous. Mar 19, 2018 construction and working principle of loeffler boiler loeffler boiler is a high pressure, forced circulation and water tube boiler with the internal furnace. Its crown has a hemispherical shape and thus provides maximum volume of space. The working principle of bend tube boiler is more or less same as other water tube boilers, but it utilizes four drums. Today in this articles we are discussed about the cochran boiler, how to cochran boiler is worked, and about its mounting and accessories, great features of cochran boiler and its advantage and disadvantage. The hot combustion gases pass through the boiler tubes, which are.
A key feature of the st25 series is the boilers compact design. Cochran boiler the cochran is a typical tank boiler of vertical type suitable for producing relatively small amounts of low pressure steam for auxiliary purposes. The length of the shell can be varied from 4 to 7 meter. Cochran boiler consists of a cylindrical shell with its crown having a spherical shape. Construction and maintenance cost of this boiler is very low and it has the ability to overcome load fluctuation during operation. A boiler which generates steam at a pressure higher then 80 bar is called high pressure boiler.
A closed vessel in which steam is produced from water by combustion of fuel. Mar 10, 2016 lancashire is a horizontal, stationary fire tube boiler. Lab manual babcock and wilcox boiler and cochran boiler. Definition of boiler mountings and accessories, imp ortant names of boiler mountings and accessories and their funct ions. E, combustion of apparatus for producing or recovering heat together with the apparatus for transferring the heat so. Industrial boilers free download as powerpoint presentation. In this article, i will explain all the parts of babcock and wilcox boiler along with working, construction, boiler terms, advantages, and disadvantages. Hvac refrigeration hse books welding health and safety fabrication and welding power generation electrical books pdf mechanical engineering. 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. Cochran boiler diagram,main parts,working, advantages. The water supplied to the boiler that is converted into steam is called feed water. Construction and model of cochran boiler oit consists of a cylindrical shell, hemispherical fire box, fire tubes and chimney. In the cochran boiler, any type of fuel can be used.
Essentials of operation are also briefly explained. Formerly the cochran borderer steam boiler utilises a full wet back design for maximum efficiency. Requirements of a perfect steam boilers should be absolutely reliable,capable of producing maximum steam at required pressure. Fire tube boiler parts explained learn about the working. Lancashire is a horizontal, stationary fire tube boiler. It a internally fired boiler because the furnace is placed inside the boiler. Steam used for producing power,for industrial process work or for heating proposes. Definition, parts or construction, working principle.
Composite boilers are provided with systems that can be run by two ways, either by conventional oil firing and burning or by using the heat from the engine exhaust gases. Cochran boiler can be divided into three parts such as fire box. Boiler burners can be designed to operate the burner and steam production as an. The ratio of the grate area to the heating surface area varies from 10. It is widely used in marine practice, either fired directly by coal or oil fuels, or else used for heat recovery from the exhaust of. Construction the boiler consists of cylindrical shell, hemispherical fire box, fire tubes and chimney. A manhole is providing with this boiler and for this reason, it is easy to clean and inspect inside the boiler.
Steam trapa device used to remove condensate or liquid from steam systems, p. Outline introduction specification characteristics construction working principles mounting and accessories used maintenance advantage disadvantage reference introduction specification characteristics construction working principles mounting and accessories used maintenance advantage disadvantage reference. Hot water boilers are normally completely filled with water during operation. These boilers were not common, owing to drawbacks with excessive wear in service.
Steam used for producing power,for industrial process work or for heating proposes requirements of a perfect steam boilers. See discussions, stats, and author profiles for this publication at. A cochran boiler is one of the best popular types of vertical multitubular, firetube boiler. Even the cochran boiler can be modified to be used as a composite boiler. These individual types of boilers have their own advantages and applications. The fuel is ignited through the fire hole provided at the right bottom of the. Cochran boiler working,advantages and disadvantages. St23 boilers can be found hard at work in over 100 countries across the globe. Simple vertical boiler, cochran boiler, lancashire boiler. Fire tube boiler parts explained learn about the working of. Benson boiler construction, working principle and advantages with diagram. Construction and working principle of locomotive boiler.
Aug 2, 2019 cochran boiler is one of the best types of vertical, multitubular boiler. May 12, 2020 it is the largest valve on the boiler. Cochran boiler is one of the best types of vertical, multitubular boiler which has a number of horizontal fire tubes used for the generation of steam. What is lancashire boiler construction, working with. A boiler is a closed vessel in which fluid generally water is heated. The grate is also placed at the bottom of the furnace and the ashpit is located below the grate. Oct 20, 2014 specification of cochran boiler height 5. Parallel tube boilers place all of their firetubes in a single parallel group, running from side to side of the boiler shell. From provision of new industrial boiler equipment, through maintenance and supply of replacement boiler spare parts.
In this type, the combustion takes place internally and water will be circulated naturally. Cochran boiler,lancashire boiler,cornish boiler etc. For boilers working at pressures below this value the test value is 2 x design pressure. Mar 19, 2019 cochran boiler working and construction. Difference between fire tube boiler and water tube boiler.
Cochran uk industrial boiler specialists boiler manufacturers. Three drums are placed on the heat source as shown on the figure. In cochran boiler first the fuel is inserted into the firebox and placed on the grate. Construction and working principle of scotch marine boiler. The heat is supplied in the working fluid feed water in the boiler and thus vapor is generated. How this issue was resolved is unclear, but in june 1873, the boiler. Basic mechanical engineering lab manual method april 2011 doi. Superheated steamsteam that has been heated to a very high temperature so. A boiler is a closed vessel in which water is heated, steam is generated, superheated or any combination thereof under pressure or vacuum by the direct application of heat from combustible fuels or electricity.
Construction and working principle of babcock and wilcox. In this type of boiler, water is circulated inside the tubes and hot gases flow over the tubes. The more efficient fire tube boiler has many tubes of small diameter passing through the water space of shell. Describe with a neat sketch the working of cochran boiler. It is best suitable for small capacity requirements. Steam generators closed vessels made of steel and used for generation of steam vaporizing water combustion of fuels eg. Similar to cornish boiler,in lancashire boiler two flue tubes but in cornish. Lancashire boiler is horizontal smoke tube boiler size range from a shell 2m diax6m long to 3m diax10m long working pressure range are up to 20kgfcm2 ratio of heating surface to grate area is 2430 efficiency is about 56% without economizer and 75% with economizer. Packaged boiler is the most common and efficient type of fire tube boiler used in industry to produce steam and hot water. Cochran boiler main parts, working, advantages and. Cochran boiler is a fire tube boiler which is just like the simple vertical boiler with some. Thingsreadingword readingreading books mechanical engineeringlibros.
May 02, 2016 today we have discussed about working, construction and advantages and disadvantages of cochran boiler. Suitable for any application, the design features low noise burners as standard, and are available with a comprehensive range of control options. It has a maximum evaporative capacity of 3640 kg of steam per hour, from cold feed, when burning 568 kg of coal per hour. The more common form of vertical boiler, which was very similar in external appearance, instead used a single flue and waterfilled crosstubes. Like a water tube boiler, water usually pumped into the shell through. The hot exhaust gases expand upward and pass across the left side of the. The demand for large size boiler units and increased pressure led to the introduction of water tube boilers and one of the best design of a water tube boiler is the babcock and wilcox boiler. Steam drumthe top drum of a boiler where all of the generated steam is collected before entering the distribution system, p. A steam boiler is controlled by a pressure control commonly called a pressuretrol, while a hot water boiler is controlled by a temperature switch called an aquastat.
The cochran boiler is a modified version of a basic vertical boiler with different fire tubes that can exchange heat by convection to water. Boiler and steam generation the boiler system comprises of. Cochran boiler is used for the small steam requirements in industries. Jun 27, 2020 locomotive boiler construction working and application with diagram. A parallel control system has one actuator for the fuel valve and one actuator for the air damper.
Cochran boiler consists of a cylindrical shell with a dome. This boiler is invented by sir william fairbairn in the year 1844. Industrial boilers steam generators closed vessels made of steel and used for generation of steam vaporizing water combustion of fuels eg. Cochran boiler is a vertical, multitublar fire tube, internally fired, natural circulation boiler. On the front of the boiler is an external reversing chamber, which again reverses the flue gases and leads them to the end of the boiler in the 3rd smoke tube pass. It operates similar to that of a cochran boiler but the construction is different. Cochran boiler working, construction, diagram, application. Construction and working principle of babcock and wilcox boiler.
Babcock and wilcox boiler working, construction,advantage. A typical cochran boiler, as illustrated, might be 15 feet 4. But it has a low steam production rate 6500 kghr and maximum steam pressure range is 10. Should be absolutely reliable,capable of producing maximum steam at required pressure for minimum of fuel consumption,with minimum attention and minimum initial cost and operating cost. Construction and working principle of lancashire boiler. Steam boilers on the other hand are only 34 filled with water. Construction and working principle of cornish boiler. Ordinance, chapter 56, as applicable to fire tube steam boilers. Today we have discussed about working, construction and advantages and disadvantages of cochran boiler. In fire tube boiler, there are numbers of tubes through which hot gases are passed and water surrounds these tubes. How this issue was resolved is unclear, but in june 1873, the boiler shop. There are two basic changes made in simple vertical boiler in order to make it cochran boiler.
If you have any doubt or query regarding this article ask by commenting. Lean manufacturing, lean sigma, flexible manufacturing systems view project a book writing project on essentials of estimation. What is lancashire boiler construction, working with diagram. Boilers objectives after completing this chapter, you will be able to. Aug 30, 2019 this type of boiler is mounted horizontally in direction and has multi tubes. Lancashire boiler are a type of steam boiler that was developed in lancashire, england and used extensively in the cotton mills during the industrial revolution and victorian era till electricity took over. Explain the principle of fire tube and water tube boilers. The grate is also placed at the bottom of the furnace and ashpit is located below the gate. The best known of these is the cochran design cochran boiler. This closeness in size reflects the fact that a coalfired unit has to be designed to prevent excessive slagging, whereas an oil fired unit has. Here, water partially fills a boiler barrel with a small volume left above. Coal is fed to the grate through the fire door and is burnt.
143 1417 972 917 950 1116 211 836 731 1116 1020 284 237 344 122 617 1476 934 1235 723 802 1368 1234 379 98 650 1230 878 672 1393 116 377 41 651 457