Construction[ edit ] The apparatus consists of an intake valve which feeds into a calibrated water or glycerin jacketed gas burette , this burette is then connected by tubing to two or more absorption pipettes containing chemical solutions that absorb the gases it is being used to measure. The intake and each of the absorption pipettes are valved with stopcocks to allow the movement of gas through the apparatus to be precisely controlled. For safety and portability, the apparatus is usually encased in a wooden box with a handle. The most common absorbents are: Potassium Hydroxide Caustic Potash for carbon dioxide Pyrogallol Pyrogallic Acid for oxygen Copper I chloride ammoniacal Cuprous chloride for carbon monoxide Any left over gas is assumed to be nitrogen, though other absorbents or vessels can be used to isolate additional gases. Platinum on asbestos for example can be used to determine the hydrogen content of a sample, and The Fischer type Orsat gas analyser for example uses a platinum electrode to explode the remaining gases with hydrogen.
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Bajind Let x be the excess air supplied per kg of fuel. My presentations Profile Feedback Log out. By means of a rubber tubing arrangement, the gas to be analyzed is drawn into the burette and flushed through several times. The gas is again sent to the burette. Auth with social network: N 2 will depend on this total oxygen required.
The gas in the burette is expelled to the atmosphere to remove any air left in the joints, tubes, spparatus. Now the three way cock is kept in the closed position. Each pipette is made of two pipettes joined together by a glass tube at the bottom as shown.
Published by Danielle Flores Modified over 5 years ago. This process of sucking and exhausting of gas is repeated times, so as to expel the air from the capillary connecting tubes, etc.
This article is an orphanas no other articles link to it. We think you have liked this presentation. 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. To make this website work, we log user data and share it with processors.
The absorption bulbs are filled with their respective solutions to level just below their rubber connections. This method is very much useful when the composition of the fuel is now known. 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.
Then the chemical equations can be written as. 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. 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.
This page was last edited on 20 Decemberat Once we have the analysis of the products of combustion by weight, we can convert this into volumetric analysis of the products of combustion. When H 2 O vapours are included in the exhaust or flue gases, then the products of combustion are wet. 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.
The study of quantitative measurements in chemical formulas and reactions Chemistry — Mrs. Here the CO 2 component of the flue gas is absorbed. Chemical Absorption Reaction in orsat apparatus. Since one mole of any gas occupies the same volume under the same conditions of temperature and pressure.
The eudiometer reading is taken and the difference of two readings gives the percentage of CO 2 by volume in the gas sample. Quantity of sulphur dioxide is negligibly small and the water vapours are condensed and do not enter the flue gas. Let C be the percentage by weight of carbon in the fuel. These methods will be better understood with the help of illustrative examples. 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.
Their stop-cocks are then closed. For safety and portability, the apparatus is usually encased in a wooden box. The three way cock is open and the sample of flue gas is drawn in the measuring bottle. The Orsat analysis of the flue gas shows The process is repeated to ensure full absorption.
Using the stopcocks that isolate the absorption burettes, the level. The lower end of the burette is connected to a water reservoir by means of a long rubber tubing. If you wish to download it, please recommend it to your friends in any social system. Eudiometer is connected to aspirating bottle by means of rubber tube. Orsat gas analyser — Wikipedia 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.
Its indirect measurement can be done if we know the volumetric analysis of the dry flue gas. Metallurgy Job Interview Questions and Answers. It consists of a graduated measuring bottle also called as eudiometer, an aspirating bottle, three double reagant pipettes to appparatus CO 2O 2 and CO. For converting the gravimetric analysis of the products of combustion into volumetric analysis and vice-versa, two tables are given below: The sample of gas is returned to eudiometer and cock appqratus is closed by keeping the reagent to its original level of solution.
FLUE GAS ANALYSIS BY ORSAT APPARATUS PDF
Bajind Let x be the excess air supplied per kg of fuel. My presentations Profile Feedback Log out. By means of a rubber tubing arrangement, the gas to be analyzed is drawn into the burette and flushed through several times. The gas is again sent to the burette. Auth with social network: N 2 will depend on this total oxygen required. The gas in the burette is expelled to the atmosphere to remove any air left in the joints, tubes, spparatus. Now the three way cock is kept in the closed position.
Orsat's gas analyser
Orsat gas analyser