Write About Fluidized Bed Boilers?

Write About Fluidized Bed Boilers?
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Answer :

When the high velocity gas is passed through a packed bed of finely divided solid particles, the particles become suspended in the gas stream and the packed bed becomes a fluidized bed. When the gas velocity is very high, the fluidized bed become turbulent and rapid mixing of particles occurs. Ultimately, the, behaviour of mixture solid particles and gas become a fluid. Burning of a fuel in such a state is known as Fluidized Bed Combustion. The boiler plant using this fluidized bed combustion is known as fluidized bed boilers.
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Related questions

State Some Advantages Of Fluidized Bed Boilers?

Description : State Some Advantages Of Fluidized Bed Boilers?

Last Answer :  Any type of fuel solid, liquid (or) gaseous fuel (or) domestic and industrial waste can be used in FBC system. Any type of combustible matter can be burned by adjusting the factors as size ... .  High combustion efficiency.  The solid fuel need not be pulverized in fluidized bed boilers.

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Description : Write About Waste Heat Boilers?

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Name Important High Pressure Boilers?

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State Important Advantages Of High-pressure Boilers?

Description : State Important Advantages Of High-pressure Boilers?

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What Is The Main Purpose Of High-pressure Boilers?

Description : What Is The Main Purpose Of High-pressure Boilers?

Last Answer : The high-pressure boilers are used to increase the efficiency of the plant and to reduce the cost of electricity production.

Write short note on i. Cyclone separator. ii. Fluidized bed dryer.

Description : Write short note on i. Cyclone separator. ii. Fluidized bed dryer. 

Last Answer : Cyclone Separator Principle: Centrifugal force Construction1) Cyclone separator is size separation device 2) It consists of a cylindrical vessel with a conical base. 3) The upper part of ... are produced 3) High friction between practices generate electrostatic charges. Diagram:  

Write About Isotopes Of An Element?

Description : Write About Isotopes Of An Element?

Last Answer : Some elements have the same number of protons in the nucleus but different number of neutrons. As a result, these elements have the same atomic number but different mass number. Such type of elements ... mass numbers due to different number of neutrons, are known as in the isotopes of an element.

Write About Atomic Number?

Description : Write About Atomic Number?

Last Answer : The nucleus contains protons and neutrons. The number of protons in a given atom is an atomic number (Z). The atomic number for H is 1 and He is 2.

Write About Boiler Mountings?

Description : Write About Boiler Mountings?

Last Answer : The devices used for the efficient operation, proper maintenance, and safe operation boiler mountings. The different boiler mountings are: 1. Water gauge (or) water level indicator 2. Pressure gauge (or) steam gauge 3. Safety valves 4. Fusible plug 5. Stop valve 6. Blow off cock 7. Feed check valve.

Write About Co2 Recorders?

Description : Write About Co2 Recorders?

Last Answer : In thermal power plants, it is necessary to keep the concentration Of CO2 is low is necessary as possible. To achieve this, a constant recording of concentration Of CO2 These recorders ... different principles, as given below.  Thermal conductivity cell  Chemical absorption cell  Density balance

Write About Forced Draught System?

Description : Write About Forced Draught System?

Last Answer : In this system, the blower (forced draft fan) is located at the base of the boiler near the grate. Air is forced to the furnace by forced fan and the flue gases are forced to chimney through economizer and air preheater.

Write About Artificial Draught?

Description : Write About Artificial Draught?

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Write About Classification Of Draught?

Description : Write About Classification Of Draught?

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Write About Screw Conveyor And Bucket Conveyors?

Description : Write About Screw Conveyor And Bucket Conveyors?

Last Answer : In screw conveyor, an endless helicoids screw is fitted to the shaft. On one end of the shaft, the driving mechanism is fitted and the other end of the shaft is supported on a ball bearing. While ... as vertical lifts. The coal is loaded at the bottom and unloaded at the top in the bucket conveyors.

Write About In Plant Handling Of Coal?

Description : Write About In Plant Handling Of Coal?

Last Answer : In order to handle large quantity of coal inside the plant, some mechanical handling systems are provided f6r smooth, easy and better controlled operation. The implant coal handling is divided, into following categories.  Coal unloading  Coal preparation  Coal transfer  Coal storage

Write About Out Plant Handling?

Description : Write About Out Plant Handling?

Last Answer : Out plant handling includes the handling of coal mine to the thermal power plant. These handlings are outside the plant in the following ways.  Transportation by sea (or) river  Transportation by rail  Transportation by road  Transportation of coal by pipeline.

Write About Loeffler Boiler?

Description : Write About Loeffler Boiler?

Last Answer : The major disadvantage in La Mont boiler is the deposition of salt and sediment on the inner surface of the water tubes. It reduces the heat transfer and ultimately the steam generating capacity. ... by preventing water from flowing through the boiler tubes. The steam is generated outside the tubes.

Write About Benson Boiler? State Some Important Advantages Of Benson Boiler?

Description : Write About Benson Boiler? State Some Important Advantages Of Benson Boiler?

Last Answer : Benson boiler is the high pressure, vertical fire tube boiler. This boiler has no drum and is ~designed to operate at critical pressure of 225 bars. Benson boiler has no drum. So the total ... reduced by 20%, when compared to other boilers. The erection of Benson boiler is easier and quicker.

Write About La Mont Boiler? What Is The Major Disadvantage Of La Mont Boiler?

Description : Write About La Mont Boiler? What Is The Major Disadvantage Of La Mont Boiler?

Last Answer : La Mont boiler is a forced circulation high pressure water tube boiler. The major disadvantage is the formation of bubbles, salt and sediment on the inner surfaces of the heating surfaces. This reduces the heat flow and steam generation.

Write About Prime Movers?

Description : Write About Prime Movers?

Last Answer : Prime mover converts the kinetic energy of water into mechanical energy to produce electrical energy. Pelton wheel, turbine, Francis turbine, Kaplan turbine and Propeller turbine are prime movers used in hydraulic power plants.

How can one determine if a particular solid can be fluidized as in a fluidized bed?

Description : How can one determine if a particular solid can be fluidized as in a fluidized bed?

Last Answer : Mr. Alex C. Hoffmann of the Stratingh Institute for Chemistry and Chemical Engineering states: Whether a material can be fluidized at all is the question: if it is fine or sticky, the bed will be ... the x-axis is the average particle diameter and the y-axis is the bulk density of the bed.

Draw the labelled diagram of “Fluidized bed dryer” and state its disadvantages.

Description : Draw the labelled diagram of “Fluidized bed dryer” and state its disadvantages.

Last Answer : Fluidized bed dryer. Disadvantages:   1) Production of fines 2) Generation of electrostatics charges amongst the particles  3) Contamination due to erosion of pipes and vessels due to abrasion by particles.

Give any two application of fluidized bed dryer.

Description : Give any two application of fluidized bed dryer.

Last Answer : i. It gives high drying rate.  ii. Suitable for thermolabile material.  iii. Drying takes place of individual particles.  iv. Temperature can be controlled.  v. Prevent the risk of migration of soluble material.  vi. It can mostly used for drying of granules.

Give principle, working and use of fluidized bed drier.

Description : Give principle, working and use of fluidized bed drier. 

Last Answer : Principle: If a gas is allowed to flow upward through a bed of solid particle at a velocity greater than the settling velocity of the particle, particle partially suspended in the gas stream. The ... process for tablet preparation It is used in coating. Used for drying of filter cake.

Name The Coolants Commonly Used For Fast Breeder Reactors?

Description : Name The Coolants Commonly Used For Fast Breeder Reactors?

Last Answer :  Liquid metal (Na (or) Na K)  Helium (He)  Carbon dioxide.

What Is Breeding In Nuclear Reactor?

Description : What Is Breeding In Nuclear Reactor?

Last Answer : The process of producing fissionable material from a fertile material such as uranium 238 (U 238) and thorium 232 (Th 232) by neutron absorption is known as breeding.

What Are The Advantages Of Gas Cooled Reactor Nuclear Power Plant?

Description : What Are The Advantages Of Gas Cooled Reactor Nuclear Power Plant?

Last Answer : 1. Fuel processing is simple. 2. The use of C02 as coolant completely eliminates the possibility of explosion in reactor. 3. No corrosion problem.

State Some Advantages Of Pressurized Water Reactor?

Description : State Some Advantages Of Pressurized Water Reactor?

Last Answer :  The pressurized water reactor is compact  In this type, water is used as coolant; moderator and reflector water is cheap and available in plenty)  It requires less number of control rods.

Name The Different Components Of Nuclear Reactor?

Description : Name The Different Components Of Nuclear Reactor?

Last Answer : 1. Nuclear fuel 2. Moderator 3. Control rods 4. Reflectors 5. Reactor vessel 6. Biological shielding 7. Coolant

What Is Meant By Nuclear Fission?

Description : What Is Meant By Nuclear Fission?

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What Are The Different Types Of Load Acting On The Chimney?

Description : What Are The Different Types Of Load Acting On The Chimney?

Last Answer : Its own weight which is considered to act on single vertical force acting through the centroid The wind pressure, which is considered to act on the horizontal force acting on the centroid of vertical projected area.

What Is The Purpose Of Control Rods?

Description : What Is The Purpose Of Control Rods?

Last Answer : The control rods are used to start the chain reaction, maintain the chain reaction at required level and to shut down the reactor during emergency.

What Is The Working Principle Of Magneto Hydrodynamic Power Plant?

Description : What Is The Working Principle Of Magneto Hydrodynamic Power Plant?

Last Answer : The working principle of MHD is as like that of dynamo. Instead of solid conductor high temperature plasma is passed through the magnetic field at sonic speed. When the gas is passed through magnetic field, current is induced. Electrodes collect this induced current.

Name The Different Types Of Mhd Generators?

Description : Name The Different Types Of Mhd Generators?

Last Answer :  Open cycle MHD  Closed cycle MHD  Closed cycle MHD with liquid metal

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Description : What Are The Advantages Of Sodium In Fast-breeder Reactors?

Last Answer :  Sodium has very low absorption cross-sectional area.  It possess good heat transfer properties at high temperature and low pressure.  It does not react with any of the structural materials used in primary circuits.

What Are The Demerits Of Breeder Reactor?

Description : What Are The Demerits Of Breeder Reactor?

Last Answer :  Highly enriched fuel is required  Control is difficult and expensive  Safety must be provided against melt down  Handling of sodium is a major problem

What Are The Advantages Of Breeder Reactors?

Description : What Are The Advantages Of Breeder Reactors?

Last Answer :  It gives high power density than any other reactor.  High breeding is possible.  High burn-up of fuel is achievable.  The operation of the reactor is not limited by Xe poisoning.

What Are The Advantages Using Co2 As Coolant?

Description : What Are The Advantages Using Co2 As Coolant?

Last Answer :  Gases do not react chemically with the structural materials.  Gas can attain any temperature for a particular pressure.  They do not absorb neutron.  The leakage of gas will not affect the reactivity.  The gas coolant provides best neutron economy.

Name Few Types Of Reactors?

Description : Name Few Types Of Reactors?

Last Answer : Fast reactors, Thermal reactors, natural fuel reactors, Enriched Uranium reactors, water moderated reactors, heavy water moderated reactor, graphite moderated reactor, gas cooled reactors and Sodium cooled reactors.

What Are The Desirable Properties Of A Coolant?

Description : What Are The Desirable Properties Of A Coolant?

Last Answer :  It should not absorb neutron  Have high chemical and radiation stability  Non-corrosive  Have high boiling point  Non-toxic

What Are The Desirable Properties Of A Good Moderator?

Description : What Are The Desirable Properties Of A Good Moderator?

Last Answer :  It must be as light as possible It must slow down the neutron as quick as possible.  It must have resistance to corrosion.  It must have good machinability.  It must have good conductivity and high melting point.

Define Fertile Materials And Breeding In Reactors?

Description : Define Fertile Materials And Breeding In Reactors?

Last Answer : There are materials like U 235 and Th232 which are not fissile but can be converted into fissile materials by the bombardment of neutrons. Such materials are known as fertile materials. The process of converting more fertile material into fissile material in a reaction is known as breeding.

Define Multiplication Factor Of A Fission Process?

Description : Define Multiplication Factor Of A Fission Process?

Last Answer : k =number of neutrons of any one generation/number of neutrons of immediately preceding generation.

What Are The Requirements To Sustain Fission Process?

Description : What Are The Requirements To Sustain Fission Process?

Last Answer :  The bombarded neutrons must have sufficient energy to cause fission.  The number of neutrons produced must be able to create the rate of fission.  The fission process must generate energy.  The fission process must be controlled.

What Is The Need Of Depreciation Cost?

Description : What Is The Need Of Depreciation Cost?

Last Answer : Depreciation cost is the amount to be set aside per year from the income of the plant to meet the depreciation caused by the age of service, wear and tear of the machinery and equipments. Depreciation amount collected every year helps in replacing and repairing the equipment.

What Includes Operating Cost?

Description : What Includes Operating Cost?

Last Answer : Operating cost includes the following cost.  Cost of fuel  Cost of operating labour,  Cost of maintenance labours and materials.  Cost of supplier like Water for feeding boilers, for condenser and for general use.  Lubrication oil and, grease.  Water treatment chemicals.

What Includes Fixed Cost?

Description : What Includes Fixed Cost?

Last Answer : Fixed cost includes the following cost. 1. Cost of land 2. Cost of building 3. Cost of equipment 4. Cost of installation 5. Interest 6. Depreciation cost 7. Insurance 8. Management cost

Define Load Factor?

Description : Define Load Factor?

Last Answer : Load factor is defined as the ratio of average load to the peak load (or) maximum demand.

Define Load Curve?

Description : Define Load Curve?

Last Answer : Load curve is a graphical representation between load in kW and time in hours. It. shows variation of load at the power station. The area under the load curve represents the energy generated in a particular period.

Define Demand Factor?

Description : Define Demand Factor?

Last Answer :  Demand factor is defined as the ratio of maximum demand to connected load.  Connected load is the sum of ratings in kW of equipment installed in the consumer’s premises.  Maximum demand is the maximum load, which a consumer uses at any time.