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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Now consider the percentage analysis of the wet products.

Using the stopcocks that isolate the absorption burettes, the level. For safety and portability, the apparatus is usually encased in a wooden box. Views Read Edit View history. Each pipette is made of two pipettes joined together by a glass tube at the bottom as shown.

Its indirect measurement can be anallysis if we know the volumetric analysis of the dry flue 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can be obtained by any one of the following methods Carbon content of the fuel is not given directly: Typically, ml is withdrawn for ease of calculation.

Published by Danielle Flores Modified over 5 years ago. OK Air Quality Revision. 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.

The study of quantitative measurements in chemical formulas and reactions Chemistry — Mrs. Instruments used in medical laboratories. Although largely replaced by instrumental techniques, the Orsat remains a reliable method of measurement and is relatively simple to use. 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.

Their stop-cocks are then closed. The absorption bulbs are filled with their respective solutions to level just apparatua their rubber connections. The flue gas is expelled by raising the aspirating bottle. The three-way stop-cock is then closed.


Thereby, weights of all constituents of the flue or exhaust gases are determined and therefore total weight of the gas and then the percentage composition of the gas can be determined.

For balancing purpose, we have to consider the moles of H 2 O produced: The aspirating bottle is lowered so that the eudiometer reads zero on graduated scale. When the combustion of the fuel takes place, the products of combustion will be carbon dioxide, sometimes carbon monoxide may also be present sulphur dioxide, vapour and nitrogen all the while, oxygen also will be present in the flue gases.

After writing the combustion equation, we can proceed to balance the hydrogen also and the unknown. Dean—Stark Soxhlet extractor Kipp’s. The lower end of the burette is connected to a water reservoir by means of a long rubber tubing. Since one mole of any gas occupies the same volume under the same conditions of temperature and pressure.

Aspirating bottle is moved up and down several times to ensure the appwratus absorption of CO 2 fule KOH solution in reagent pipette. The main constituents of the flue gases are carbon dioxide, carbon monoxide, oxygen and nitrogen. When H 2 O vapours are rosat in the exhaust or flue gases, then the products of combustion are wet. The illustrative examples will give apparafus reader idea about the conversion of gravimetric into analydis analysis and vice-versa.


This procedure is repeated times to ensure a right sample of appagatus gas taken for analysis. STEP 3 The volumes of O2 and CO are similarly determined by passing the remaining gas through alkaline pyrogallic acid bulb and ammonical cuprous chloride bulb respectively.

Eudiometer is connected to aspirating bottle by means of rubber tube. Feedback Privacy Policy Feedback.

Orsat gas analyser

Then as before, consider 1 kg fuel to contain carbon Chydrogen Hsulphur S and oxygen O and the products of combustion will be. Hence, it is necessary that the flue gas is passed first through potassium hydroxide bulb, where CO2 is absorbed, then through alkaline pyrogallic acid bulb, when only O2 will be absorbed because CO2 has already been removed and finally through ammonical cuprous chloride bulb, where only CO will be absorbed.


Chemical Absorption Reaction in orsat apparatus. Please introduce links to this page from related articles ; try the Find link tool for suggestions. 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. 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 gas in the burette is expelled to the atmosphere to remove any air left in the joints, tubes, etc.

The apparatus consists essentially of a calibrated water-jacketed gas burette connected by glass capillary tubing to two or three absorption pipettes containing chemical solutions that absorb the gasses it is required to measure. An Orsat gas analyser is a piece of laboratory equipment used to analyse a gas sample typically fossil fuel flue gas for its oxygencarbon monoxide and carbon dioxide content. Registration Forgot your password?

The eudiometer reading is taken and the difference of two readings gives the percentage of CO 2 by volume in the gas sample.

FLUE GAS ANALYSIS ORSAT APPARATUS. – ppt video online download

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Year 10 C Pathway Mr. Let C be the percentage by weight of carbon in the fuel. We will convert this volumetric analysis into analydis analysis and then the procedure is same as the above article. Table given below will show this procedure of converting volumetric analysis into gravimetric analysis.