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Determination of calorific value by Bomb Calorimeter

Course Title: Fuel TechnologyCourse Code: ACCE-252Applied Chemistry & Chemical Engineering

Shaikh Ashraful Alam Dept. of Applied Chemistry & Chemical EngineeringBsmrstu,Gopalgang,Bangladesh

Calorific ValueCalorific Value may be defined as the amount of heat liberated in calories by the complete combustion of unit weight materials with oxygen and the condensation of produce to desired temperature.The calorific value of a fuel may be defined as the amount of heat generated by burning one kg of fuel completely.

Calorimeter It is a device used to calculate the Calorific Value of Solid , Liquid & Gaseous Fuels.

Bomb CalorimeterA bomb calorimeter is a type of constant-volume calorimeter used in measuring the heat of combustion of a particular reaction.Used to measure enthalpy changes of combustion reactions at a constant volume.

OverviewBasically, a bomb calorimeter consists of a Small cup to contain the sampleOxygenA stainless steel bombWaterA stirrerA thermometerThe dewar (to prevent heat flow from the calorimeter to the surroundings) Ignition circuit connected to the bomb.

Figure

Determination of C.V By bomb calorimeter(con.) The vassel is fitted with a tight screw cap.

Tight screw cap

Determination of C.V By bomb calorimeter(con.) Two electrod are connected each other through platinum wire.The wire remain in a platinum dipped cap just below it.A small amount of substance under investigation is taken in platinum cap.

ElectrodPlatinum wireCapSubstance

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Determination of C.V By bomb calorimeter(con.) The vassel is then filled with excess of oxygen at a pressure of about 20-25 atm and is subsequently scaled.

Determination of C.V By bomb calorimeter(con.) It is now dipped in a insulated water bath which is also have mechanical stirrer and a thermometer

Water bathMechanicalstirrerThermometer

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Determination of C.V By bomb calorimeter(con.) The initial temperature of water is notedCombustion is started by passing electric current through the platinium wire.Thats raise the temperature of water,it is recorded from the temperatureBy knowing the heat capacity of thermometer and also raise in temperature.the heat envolved can be calculated

Video Of Bomb Calorometer