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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Firstly, the existing air or the gas is expelled from the eudiometer by raising the aspirating bottle and keeping three way valve open to atmosphere. The three-way stop-cock is now connected to the flue gas supply and the reservoir is lowered to draw in the gas, to be analysed, in the burette.
The other end is provided with a three-way stop-cock, the free end of which is further connected to a U-tube packed with glass wool for avoiding the incoming of any smoke particles, etc. For adjusting final volume, the three-way stop-cock is opened to atmosphere and the reservoir is carefully raised, till the level ofwater in it is the same as in the burette, which stands at mL mark. With the exclusion of the H 2 O vapours, the table will be slightly modified accordingly. Then as before, consider 1 kg fuel to contain carbon Chydrogen Hsulphur S and oxygen O and the products of combustion will be.
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Note here that hydrogen has to be considered for finding the total oxygen required. Therefore, weight or gravimetric analysis can be converted into volumetric analysis by dividing the weight of the gas by its molecule weight to get the volume of the gas.
When the volumetric analysis of dry gas is given, then the amount of air supplied per kg of fuel can be obtained by any one of the following methods Carbon content of the fuel is not given directly: The three-way stop-cock is opened to the atmosphere and reservoir is raised, till the burette is completely filled with water and air is excluded from the burette.
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FLUE GAS ANALYSIS ORSAT APPARATUS.
When H 2 O vapours are included in the exhaust or flue gases, then the products of combustion are wet.
Once this excess oxygen is obtained, then we can find the weight of excess air supplied. Then their respective valves are closed. Its indirect measurement can be done if we know orsar volumetric analysis of the dry flue gas. Their stop-cocks are then closed. Now consider the percentage analysis of the wet products.
FLUE GAS ANALYSIS ORSAT APPARATUS. – ppt video online download
N 2 will depend on this total oxygen required. This gsa is an orphanas no other articles link to it. If you wish to download it, please recommend it to your friends in any social system. So the three-way stop-cock is opened to the atmosphere, and the gas expelled out by raising the reservoir.
It consists of a graduated measuring bottle also called as eudiometer, an aspirating bottle, three double reagant pipettes to absorb CO 2O 2 and CO. Aspirating bottle is moved up and down several times to ensure the complete absorption of Ags 2 by KOH solution in reagent pipette.
A simple and convenient apparatus used for analysis of dry flur gases by volume is called an Orsat Appartus. This method is very anaalysis useful when the composition of the fuel is now known.
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Orsat gas analyser
By means of a rubber tubing arrangement, the gas to be analyzed is drawn into the burette and flushed through several times. Once we have the analysis of the products of combustion by weight, we can convert this into volumetric analysis of the products of combustion. Eudiometer is connected to aspirating bottle appararus means of rubber tube. Quantity of sulphur dioxide is negligibly small and the water vapours are condensed and do not enter the flue gas.
For safety and portability, the apparatus is usually encased in a wooden box. This is because the absorbent used for O2 i.
The three cocks a, b, c and a three way cock are closed. About project SlidePlayer Terms of Service. And the percentage anaylsis analysis of the dry products of combustion is given as. Finally, gas is sucked in the burette and the volume analyysis the flue gas orsta adjusted to mL at atmospheric pressure. Let C be the percentage of carbon in one kg of fuel and the percentage analysis of the dry flue gas by weight is as given below: Anaalysis the air in the reservoir bottle is expelled to atmosphere by lifting the reservoir bottle and opening the three-way to atmosphere.
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 study of quantitative measurements in chemical formulas and reactions Chemistry — Mrs. Products of combustion are in the gaseous state and the analysis of the products appsratus combustion will be in volumes or volumetric analysis will be obtained.
CO2 first, O2 second and CO last. The three way cock is open and the sample of flue gas is drawn in the measuring bottle. The condition required for this method is that the formation of free gaa does not take place. Metallurgy Job Interview Questions and Answers.
Thus, i if the gases contain considerable amount of carbon monoxide, it indicates that incomplete combustion is occurring i. Year 10 C Pathway Mr. After leveling the liquid in the bottle and appratus, the remaining volume of gas is assumed to be nitrogen and indicates the percentage of carbon dioxide absorbed.
Calculate the atomic ratio of C: 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.