Necessity of Ash Disposal In central power stations a very large quantity of ash is produced which is about 10 to 20% of coal burnt per day. It is necessary to provide some means to remove this ash and disposed off at a sufficient distance from the site of power plant for the following reason … Read more

Oil Burners Usually the oil burners are required to be used for small capacity boilers for industrial use. The purpose of an oil burner is to receive supply of oil, meter it according to the load on the plant, atomise and vapourise the oil completely. The mixing of oil with air is so provided that … Read more

Classification of Pulverized Coal Burners Various types of coal burners are : Vertical long fame burners. Turbulent or short flame burners. Tangential burners. Cyclone burners. 1. Vertical Long Flame Burner : Vertical long flame burners as shown in Figure A are also called as U- Name stream lined burners. Figure A shows the arrangement of … Read more

Pulverized Coal Burners The Pulverized coal can be burnt with less or excess air similar to the burning of liquid or gaseous fuels. The method of obtaining the pulverized coal has been discussed in the previous section. Here we are concerned with the required burners for burning the pulverized coal. The various requirements of pulverized … Read more

Pulverized Coal System The pulverized coal system is used now a days for big power plants of capacity 100 MW or more. The coal is pulverized in order to increase its surface area, thus, promotes the rapid combustion (like burning of gas) without the need of supplying much of excess air, consequently, it results into … Read more

Pulverized Fuel Handling System There are two methods of delivering the pulverized coal to the furnace as follows : Unit system. Bin or central system. 1. Unit system : Figure A In case of unit system, each furnace of the plant is fired by its own pulveriser connected to burner while in case of bin … Read more

Advantages and Disadvantages Pulverized Coal System Advantages of pulverized coal system : Any type of coal can be used since it is used in powdered form. Combustion is almost complete, therefore it has high combustion efficiency and high rate of steam generation. It can generate upto 2000 tons of steam per hour. Greater surface area … Read more

Underfeed Stokers and its Types The principle of operation of underfeed stokers is shown in Figure A. Figure A In case of underfeed stokers the air and fuel move in the same direction . Air is supplied through the holes in the grate and it comes in contact with raw coal. Then it passes through … Read more

Regenerative Cycle and its Advantages & Disadvantages The practical regenerative cycle involves the bleeding the steam at suitable points during the expansion of steam in the turbine and using this bled steam for heating the feed water in feed water heaters. A feed water heater is a heater exchanger consisting of tubes through which the … Read more