The assembly of a number of individual gas pipettes of the. Hempel type for a special purpose, as in the ordinary Orsat apparatus for flue gas analysis, is familiar. 3 INTRODUCTION To have proper control on combustion process, an idea about complete or complete combustion of fuel is made by the analysis of flue gas. Determination of calorific value of a fuel by Bomb calorimeter. ➢ Flue gas analysis by ORSAT apparatus. ➢ Study of valve timing diagram of Diesel Engine.

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STEP 2 The stopper of the absorption bulb, containing caustic potash solution, is opened and all the gas is forced into this bulb by raising the water reservoir. My presentations Profile Feedback Log out.

Metallurgy Job Interview Questions and Answers. When H 2 O vapours are excluded from the analysis, then the products of combustion are known as Dry Products of Combustion and in practice we consider the dry products of combustion. The three-way stop-cock is opened to the atmosphere and reservoir is raised, till the burette is completely filled appatatus water and air is excluded from the burette. Each pipette is made of two pipettes joined together by a glass tube at the bottom as shown.

Front row of pipette is connected to the front flue gas tube and rear row of pipette are connected to another tube which runs parallel to flue gas sample tube. This method is very much useful when the composition of the fuel is now known. The aspirating bottle is lowered so that the eudiometer reads zero on graduated scale. STEP 3 The volumes of O2 and CO are fllue determined by passing the remaining gas through alkaline pyrogallic acid bulb and ammonical cuprous chloride bulb respectively.


Flue Gas Analysis by Orsat Apparatus | Combustion | Thermodynamics

So the three-way stop-cock is opened to the atmosphere, and the gas expelled out by raising the reservoir. After writing the combustion equation, we can proceed to balance the hydrogen also and the unknown. The flue gas is analysia by raising the aspirating bottle. About project SlidePlayer Terms of Service. By using this site, you agree to the Terms of Use and Privacy Policy.

To use this website, you must agree to our Privacy Policyincluding cookie policy. Products of combustion are in the gaseous state and the analysis of the products of combustion will be in volumes or volumetric analysis will be obtained.

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For safety and portability, the apparatus is usually encased in a wooden box. Typically, ml is withdrawn for ease of calculation.

The three way cock is open and the sample of flue gas is drawn in the measuring bottle.

Orsat gas analyser

To find excess air supplied, first we have to consider the oxygen required for combustion of carbon monoxide to carbon dioxide and after deducting this oxygen from the oxygen present in the flue gases, the excess oxygen is obtained.

The three cocks a, b, c and a three way cock are closed.

This equation does take into consideration the complete combustion of carbon to carbon dioxide and hence approximation. Lab coat Face shield Respirator Rubber apron Safety shower. Finally, gas is sucked in the burette and the volume of the flue gas is adjusted to mL at atmospheric pressure. Now the three way cock is kept in the closed position. anqlysis


When H 2 O vapours are included in the exhaust or flue gases, then the products of combustion are wet. All the air in the reservoir bottle is expelled to atmosphere by lifting the reservoir bottle and opening appatatus three-way to atmosphere.

In this method, carbons in the reactants fuel and the products are balanced and thereby getting the moles of fuel taken. Now, when the volumetric analysis of the products of combustion is known, we can convert the volumetric analysis into gravimetric analysis in converting volume into weight of the gas by multiplying the volume with the molecular weight of the gas.

Beaker Gas syringe Vial. Retrieved from ” https: Let C be the percentage by weight of carbon in the fuel. Calculate the atomic ratio of C: The study of quantitative measurements in chemical formulas and reactions Chemistry — Mrs.


In the power plants the amount of fuel used is very large and consequently the amount of air supplied to a boiler furnace is also great and so it cannot be measured directly. The same technique is repeated for oxygen, fluf the pyrogallol, and carbon monoxide using the ammoniacal cuprous chloride. In order to aplaratus the analysis of the exhaust gases by volume, first the analysis of the exhaust gases is found by weight, i.

Note here that hydrogen has to be considered for finding the total oxygen required.