Boiler Used In Thermal Power Plant Pdf995

Boiler used in thermal power plant pdf995

How Power Plant Boiler Works?

A boiler is an enclosed pressure vessel in which water is converted into steam by gaining heat from any source coal, oil, gas etc. Boiler in thermal power plant accumulates the steam and build up a pressure to expend it in turbine and convert thermal energy to mechanical energy.

Boiler used in thermal power plant pdf995

The generator which is connected to turbine converts the mechanical energy into electric energy. There are two types of boilers are used in sub critical, super critical and ultra-super critical coal fired thermal power plant:.

The pulverized coal is blown with part of the combustion air into boiler plant through a series of burner nozzles.

Steam Boiler | Working principle and Types of Boiler

The ash from the combustion chamber, which falls down is collected in the bottom ash hoppers. The Feed water enters the boiler through the economizer tubes provided in the path of the flue gas.

The feed water is heated in the economizer and then enters the boiler drum situated outside the furnace at the top of the Boiler.

Boiler used in thermal power plant pdf995

The water is circulated in the tubes and converted into steam by gaining heat inside the furnace. The dry and saturated steam from the boiler drum then passes through the superheater section and finally available at the boiler outlet header.

Boiler In Thermal Power Plant

Pulverized coal fire boiler has been the preferred method for solid fuel firing but in the last few years, fluidized bed combustion boilers have begun to disturb this equilibrium by offering reliable solutions in the areas not served well by pulverized fuel boiler.

As air velocity is gradually increased, a stage is reached when the individual particle are suspended in the air stream.

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With further increase in the velocity of the air, the particles attain a state of high turbulence. If the sand or limestone in a fluidized state is heated to the ignition temperature of the coal and the coal is injected continuously into the bed, the fuel will burn rapidly and the bed attains a uniform temperature due to effective mixing.

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Since the temperature is below the ash fusion temperature, melting of ash and associated problems are avoided. AFBC is atmospheric fluidized bed combustion, where the furnace pressure is atmospheric pressure and velocity of fluidized air is in the range of 1. The in-bed tubes carrying water generally act as the evaporator. The flue gas from the furnace pass over the superheater sections of the boiler flow past the economizer, the dust collector and the air preheater before being exhausted to atmosphere.

In this system, the fluidized velocity in circulating beds ranges from 3. There are no steam generation tubes immersed in the bad.

Sensible Heat Addition

Generation and super heating of steam takes place in the convection section, water wall and at the exit of the riser. The heat release rate in the bad is proportional to the bed pressure and hence a deep bed is used to extract large amount of heat. This will improve the combustion efficiency. The PFBC system can be used for combined cycle operation gas turbine and steam turbine.

Boiler used in thermal power plant pdf995

A steam boiler is designed to absorb the maximum amount of heat released from the process of combustion. Radiation is the process of continuous interchange of energy by means of electromagnetic waves without a change in the temperature of the medium between two bodies involved. The heating surface in the furnace are receives heat primarily by radiation.

Boiler - working animation

The steam boiler tubes absorb the radiant heat from flame and radiate a small portion of the heat back to the furnace. Conduction is the transfer of the heat from one part of a body to other or from one body to another in physical contact.

Components of Thermal Power Plant & Working Explanation

The following mountings are usually installed on the boiler:. Boiler accessories are the components which are installed to increase the efficiency of the steam power plant. The following accessories are given below:.

Boiler used in thermal power plant pdf995

Introduction of thermal power plant, Working of coal handling plant , Working of ash handling plant. Skip to content. January 15, Jagarnath Mahato. What is boiler?

Working Principle of Boiler

How does a steam boiler work? It permits combination firing i. Require more maintenance.

Boiler used in thermal power plant pdf995

Fly ash erosion Pollution complicate unit operation Fluidized Bed combustion boiler FBC Pulverized coal fire boiler has been the preferred method for solid fuel firing but in the last few years, fluidized bed combustion boilers have begun to disturb this equilibrium by offering reliable solutions in the areas not served well by pulverized fuel boiler. There are three types of fluidized bed combustion boilers: 1.

Atmospheric fluidized bed combustion system AFBC or Bubbling fluidized bed combustion BFBC AFBC is atmospheric fluidized bed combustion, where the furnace pressure is atmospheric pressure and velocity of fluidized air is in the range of 1.

The Basics.

Circulating fluidized bed combustion CFBC In this system, the fluidized velocity in circulating beds ranges from 3. Reduce emission of SOx due to capture by limestone. Low corrosion and erosion. Easier ash removal i.

Process Navigator

Reduce maintenance High efficiency of power generation Heat Transfer In Steam Boiler A steam boiler is designed to absorb the maximum amount of heat released from the process of combustion. Radiation Radiation is the process of continuous interchange of energy by means of electromagnetic waves without a change in the temperature of the medium between two bodies involved.

Convection Convection is the process of transferring heat by movement energy through a material. Example of heat transfer by convection in steam boiler: Heating surface in the steam boiler receives heat by convection from the hot flue gases. When any fluid in a steam boiler is heated, its density is decreases and fluid become lighter. Then the heavier or cooler fluid will flow and replace the heated portion of the fluid.

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In turn the cooler portion become heated are example of convection. Conduction Conduction is the transfer of the heat from one part of a body to other or from one body to another in physical contact.

Heat received by the heating surface travels through the metal by conduction. Steam Boiler Accessories Boiler accessories are the components which are installed to increase the efficiency of the steam power plant.