Elements of Mechanical Engineering
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The document summarizes two types of boilers: the Cochran boiler and the Lancashire boiler. The Cochran boiler is a vertical, multi-tube, fire tube boiler that is portable with a small floor area. It has a shell diameter of 2.75m, height of 5.75m, and can produce 3500 kg/hr of steam. The Lancashire boiler is a horizontal, stationary boiler commonly used in industries. It is longer than the Cochran boiler at 7-9m in length and can produce 9000 kg/hr of steam. Both boilers use fire tubes for heat transfer and have similar components like safety valves, but the Lancashire boiler has a larger heating surface area due to its three-pass design
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Babcock and wilcox boiler
The document appears to be written by an individual named Rajesh Goswami, as their name is listed at the top. However, no other information is provided about the author or any content in the single line document. In just one line, the document only states the name of the author but provides no other context or substance to summarize.
Cochran boiler presentation
The Cochran boiler is a vertically oriented, multi-tube, fire tube boiler that generates steam at a low rate. It has a cylindrical shell with a height of 5.75m and diameter of 2.75m containing multiple fire tubes to increase its heating surface area of 120m2. The boiler produces steam at a capacity of 3500kg/hr at a working pressure of 6.5bar with an efficiency of 70-75%. It is suitable for applications requiring low steam generation due to its compact size and portability.
Boiler Introduction & Classification
This presentation discusses boilers, which produce steam using heat from fuel combustion. Boilers are classified based on their orientation, whether they have fire or water tubes, furnace location, circulation method, pressure rating, mobility, and number of tubes. Key types include fire tube boilers like Cochran and Lancashire models, and water tube boilers such as Babcock and Wilcox. Selection depends on required steam properties, capacity, cost, and other factors. Proper boiler design considers safety, accessibility, efficiency, and other criteria.
Construction of babcock and wilcox boiler
The Babcock and Wilcox boiler consists of a steam and water drum, water tubes, uptake header, grate, furnace, baffles, superheater, mud box, inspection doors, and damper. Coal is burned on the grate, heating the water tubes and producing steam. The steam rises into the drum while water descends back into the tubes, creating a circulation. Key advantages include high efficiency, replaceable tubes, and accessibility for inspection during operation.
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The document describes a Cochran boiler, which is a type of vertical multi-tube fire tube boiler. It has a cylindrical shell, hemispherical firebox, and horizontal fire tubes. Coal or other solid fuels are burned on a grate at the bottom of the furnace, producing hot gases that enter the combustion chamber and then pass through the fire tubes, transferring heat to the surrounding water and generating steam. Key features include its compact size, portability, ability to use various fuels, and natural water circulation, though it has lower efficiency and steam capacity than larger boilers.
Cochran Boiler-ELEMENTS OF MECHANICAL ENGINEERING
The Cochran boiler is a vertical, multi-tube, fire tube boiler that is compact, portable, and requires a small floor area. It has a cylindrical shell, hemispherical firebox, multiple fire tubes, and chimney. Hot gases from the furnace pass through the horizontal fire tubes, transferring heat to the surrounding water through convection and producing steam. The Cochran boiler is inexpensive and easy to install but has a lower steam capacity and efficiency than larger boilers.
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Boilers produce steam using heat from fuel combustion. Water tube boilers have tubes that carry water and shells that carry hot gases, allowing for higher steam pressures and capacities than fire tube boilers which have tubes that carry hot gases and shells that carry water. Key components of boilers include shells, burners, drums, furnaces, safety valves, and feed pumps. Boilers are classified by their tube configuration and common types include water tube, fire tube, and vertical or horizontal orientations. Water tube boilers have advantages over fire tube in steam generation speed, capacity, efficiency and maintenance access.
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Boilers produce steam using heat from the combustion of fuel. There are various types of boilers classified based on their orientation, heating method, circulation type, pressure, portability, and number of tubes. Fire tube boilers have hot gases passing through tubes surrounded by water, while water tube boilers have water passing through tubes surrounded by hot gases. Water tube boilers generally have higher steam pressure and production capacity compared to fire tube boilers. Common boiler types discussed in the document include fire tube boilers like Lancashire and locomotive boilers, and water tube boilers like Babcock & Wilcox. Boilers require safety devices like safety valves, water gauges, and pressure gauges.
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This document provides information about steam boilers, including:
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Boilers generate steam by transferring heat from burning fuel to water. There are two main types: fire-tube and water-tube. Factors that affect boiler selection include pressure, capacity, fuel type, and cost. Good boilers efficiently produce steam with minimal fuel and maintenance. Performance is evaluated through direct and indirect methods measuring efficiency, heat losses, and steam output. Regular testing helps identify issues and improve operation.
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The document discusses two types of boilers: the Cochran boiler and the Lancashire boiler. The Cochran boiler is a vertically oriented boiler with multiple fire tubes. It can generate steam at low rates up to 4000 kg/hr at 6.5 bar pressure. The Lancashire boiler is a horizontally oriented boiler also with multiple fire tubes. It can generate more steam at 9000 kg/hr at a maximum pressure of 16 bar. Both boilers work by heating water into steam using hot gases that pass through internal fire tubes, but the Lancashire boiler utilizes three phases of flue gases to increase its heating surface area.
Boilers (2)
1) The document provides information on various types of boilers including Cochran boiler, Lancashire boiler, and Badcock and Wilcox water tube boiler. It describes the basic construction and working of these boilers.
2) The document also discusses common boiler mountings and accessories such as pressure gauges, water level indicators, safety valves, feed pumps, and air preheaters. It explains the main functions of these components for monitoring and controlling the boiler.
3) Additionally, the document covers other boiler auxiliaries like feed water heaters, superheaters, and draught systems. It describes how these systems enhance the efficiency and performance of boilers.
Steamboilers (elements of mechanical engineering)
This document discusses different types of steam boilers. It begins by defining a steam boiler as a closed vessel made of steel that transfers heat from fuel combustion to water to generate steam. It then discusses various ways boilers can be classified, including by tube content, pressure, circulation type, use, axis position, and fuel type. Three specific boiler types are described in detail - the Cochran, Babcock & Wilcox, and Lancashire boilers. Key characteristics, construction details, working principles, and advantages/disadvantages are provided for each. Finally, common boiler mountings and accessories like pressure gauges, fusible plugs, and feed pumps are outlined.
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The document discusses different types of steam generators or boilers. It begins with an introduction to boilers, then describes how boilers are classified. It provides details on the key differences between fire-tube and water-tube boilers, including their construction, operation, applications and advantages/disadvantages. The document also discusses boiler terms, selection criteria for boilers, essential characteristics of good boilers, and provides details on specific types of fire-tube and water-tube boilers.
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The document provides information on different types of steam boilers. It discusses Cochran, Babcock and Wilcox, and Lancashire boilers. For each boiler type, it describes the key characteristics, construction, working, advantages, and disadvantages. The Cochran boiler is a vertical, multi-tube, low pressure boiler with internal firing and natural circulation. The Babcock and Wilcox boiler is a large, horizontal, water tube boiler commonly used in power stations. The Lancashire boiler is a fire tube boiler with a horizontal cylindrical shell and internal flues for increased heating surface. Videos are also included to demonstrate how each boiler functions.
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Industrial boilers are closed vessels made of steel used to generate steam through combustion of fuels like coal. They are classified based on orientation (vertical or horizontal), firing method (internally or externally), and tube configuration (fire tube or water tube). Key boiler types include vertical boilers, Cochran boilers, Lancashire boilers, locomotive boilers, Babcock & Wilcox water tube boilers, and high pressure boilers. Proper mountings and accessories are needed for safety, control, and efficiency. Modern trends favor high-capacity, high-pressure water tube boilers.
Steam boilers
This document discusses steam turbine power plants and boilers. It defines boilers and their functions, and describes their applications in power generation, heating, and industrial processes. It then covers boiler terms, classifications including fire tube vs water tube boilers, and examples of specific boiler types like simple vertical, locomotive, and high pressure boilers. Key features and principles of operation are provided for different boiler types. Finally, boiler mountings and accessories are defined.
Cochran Boiler
The document describes the Cochran boiler, a type of fire-tube boiler. It has a cylindrical shell with a hemispherical firebox and fire tubes. Coal is burned on a grate at the bottom of the firebox, producing hot gases that enter horizontal fire tubes and transfer heat to the surrounding water. The steam produced then exits through an anti-priming pipe at the top of the shell. Key features include a large heating surface area, natural circulation, and the ability to easily meet fluctuating loads due to its large reservoir. However, it is limited to a maximum working pressure of 16 bars and requires more floor space due to brick lining.
Industrial boilers
Industrial boilers are closed vessels made of steel used to generate steam by combusting fuels like coal. They are classified based on their orientation (vertical or horizontal), firing method (internally or externally fired), and tube configuration (fire tube or water tube). Common fire tube boiler types include vertical simple cross tube boilers, Cochran boilers, and Lancashire boilers used in small industries. Water tube boilers like Babcock & Wilcox and Stirling boilers are used in large power plants due to their ability to operate at high pressures and capacities. Boilers require safety devices, controls, and accessories to operate efficiently and safely.
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The document describes the Loeffler boiler, a high pressure water tube boiler. It uses forced circulation and evaporates feed water solely using superheated steam from a superheater. Key features include preventing water flow into boiler tubes to avoid scale buildup, and evaporating water in a drum using superheated steam. The document also discusses features of subcritical and supercritical boilers generally.
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This document discusses different types of boilers. It begins by explaining that a boiler produces steam using the thermal energy released from fuel combustion. It then describes the common uses of steam and some key properties of boilers. The document goes on to classify boilers based on whether they use fire tubes or water tubes to transfer heat. Several specific boiler designs are outlined, including their features and advantages. Key metrics for evaluating boiler performance like evaporative capacity and efficiency are also defined.
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This document provides an overview of steam boilers, including their definition, functions, applications, requirements, classification, and types. Key points include:
- Boilers generate steam by transferring heat from fuel combustion to water within an enclosed shell.
- Steam has applications in power generation, heating, and industrial processes.
- Efficient boilers require generating maximum steam with minimum fuel use, meeting demand, reliability, and safety.
- Boilers are classified by the position of gases/water, firing method, pressure, circulation, construction, and more.
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Elements of Mechanical Engineering
- 1. Elements of Mechanical Engineering COCHRAN BOILER & LANCASHIRE BOILER
- 2. Index: Here _ words means hyperlink & cons. Means construction.
- 4. General It is one of the best types of vertical multi-tube type boiler. It is fire tube type boiler. It is popular portable boiler. It consist of very small floor area.
- 5. Specifications Shell diameter = 2.75m Height = 5.75m Working pressure = 6.5bar(max = 15bar) Steam capacity = 3500 kg/hr(max = 4000 kg/hr) Heating surface area = 120 m² Efficiency = 70% to 75%
- 6. Characteristics It is vertical. It is portable. It is a fire tube boiler. It’s multi tube boiler. It is internally fired. Solid as well as liquid fuel can be burnt. It has natural circulation. It’s low pressure boiler.
- 7. Construction & Working The boiler consist of a cylindrical shell, hemispherical fire box, fire tubes & chimney. The top of the shell having hemispherical shaped crown. The hemispherical crown of boiler gives good strength to withstand pressure of steam inside the boiler. The grate is placed at the bottom of furnace and ash pit is located below the grate.
- 8. Continue… The furnace and the combustion chamber are connected by short flue pipe. The wall of the combustion chamber is lined with the fire bricks. The ash pit is located below the grate. TOP
- 9. Working The water is supplied to the boiler through feed check valve. The coal is introduced to the grate through the fire door. The hot gases produced from furnace enters combustion chamber through flue pipe. This hot gases enters into horizontal fire tubes. Convection heat transfer take place from flue gases passing inside the tubes to water surrounded the tubes. The flue gases coming from of fire tubes enter into smoke box. Finally they discharge to atmosphere through a chimney. The ash formed is collected in ash pit. The steam is collected through antiprimming pipe on top of the shell. TOP
- 10. Mountings Steam pressure gauge Water level indicator Dead weight safety valve Feed check valve Blow-off cock Steam stop valve Man hole Fusible plug Antipriming pipe TOP
- 11. Advantages It is compact and portable boiler therefore minimum floor area is required. Initial cost of boiler is less. It can be moved and set up readily in different locations. Quick and easy installation. Any type of fuel can be used(coal or oil). TOP
- 12. Disadvantages Steam raising capacity is less due to vertical design. Water along with steam may enter the steam pipe under heavy load due to small steam space. Efficiency is poor in smaller size. Difficulty in cleaning and inspection due to vertical design. The boiler require high head room. TOP
- 14. General It’s simple in design, easy to operate and less operating and maintenance cost. It’s one of the most commonly used stationary boilers. It’s normally used in sugar mills, textile industries where power generation as well as process heating is required. TOP
- 15. Specifications Shell diameter = 2 to 3 m Length of the shell = 7 to 9 m Working pressure = 16 bar Steam capacity = 9000 kg/hr Efficiency = 50% to 70% TOP
- 16. Characteristics It is horizontal. It is stationary. It is a fire tube boiler. It’s multi tubes boiler. It is internally fired. It has natural circulation. Solid as well as liquid fuel can be burnt. It’s medium pressure boiler. TOP
- 17. Construction TOP
- 18. Working The coal is introduced to the grate through fire holes. The combustion of coal takes place in presence of air which is regulated by damper. The combustion will produce hot gases. TOP
- 19. Mountings Steam pressure gauge Water level indicator Dead weight safety valve Feed check valve Blow-off cock Steam stop valve Low water & high steam safety valve Man hole Fusible plug Antipriming pipe TOP
- 20. Advantages Due to three passes of flue gases , the heating surface area per unit volume of boiler is large. The fluctuations in load can be easily met by this boiler due to large reservoir. By use of economizer and superheater , maximum heat of flue gases is utilized, so efficiency of boiler can be increased. Easy operation, low maintenance costs, easy to clean and inspect. TOP
- 21. Disadvantages Maximum working pressure is limited to 16 bars. Due to brick work, more floor area is required. Response of pressure build up is less. The furnace is inside the tubes therefore the grate area is restricted. TOP
- 22. Thank You TOP