ASTM-D – Download as PDF File .pdf), Text File .txt) or read online. Find the most up-to-date version of ASTM D at Engineering ASTM D Standard Test Method for Gross Calorific Value of Coal and Coke. standard by ASTM International, 10/01/ View all product details.
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There shall be no gas leakage. Assessing the valid working range of the calorimeter, as outlined in Continuous stirring for 10 min shall not raise the calorimeter temperature more than 0.
The gross calorific value can be used for computing the calorific value versus sulfur content to determine whether the coal meets regulatory requirements for industrial fuels.
The bomb shall be capable of withstanding a hydrostatic pressure test to 20 MPa psig at room temperature without stressing any part beyond its specified elastic limit. During ignition of a sample, the operator shall not extend any portion of the body over the calorimeter.
Gross Calorific Value gross heat of combustion at constant volumeQv asgm – the heat produced by complete combustion of a substance at constant volume with all water formed condensed to a liquid. An ammeter or pilot light can be used in the circuit to indicate when current is flowing.
Oxidation of coal after sampling can result in a reduction of calorific value. For manually operated calorimeters, the ignition circuit switch shall be d585 the momentary double-contact type, normally open except when held closed by the operator.
Corrected Temperature Rise – the calorimeter temperature change caused by the process that occurs inside the bomb corrected for various effects. Combustion Bomb – Constructed of materials that are not affected by the combustion process or the products formed to introduce measurable heat input or alteration of end products. Ignition Circuit – A V alternating or direct current is required for ignition purposes.
Discussion – The astk capacity astmm also be referred to as the energy equivalent or water equivalent of the calorimeter.
Reagent Water – Conforming to conductivity requirements for Type II of Specification D for preparation of reagents and washing of the bomb interior. The first and most obvious is the temperature qstm probe itself.
ASTM D5865 – 13
A step-down transformer connected to an alternating current circuit, capacitors, or batteries can be used. The immersed portion of the stirrer shall be accessible to d58655 outside through a coupler of low thermal conductivity. Oxygen – Manufactured from liquid air, guaranteed to be greater than Replace cracked or significantly worn parts. Also consult the calorimeter equipment qstm installation and operating instructions before using the calorimeter.
Base metal alloy crucibles are acceptable, if after three preliminary firings, the weight does not change by more than 0. Automated Calorimeter – a calorimeter which has a microprocessor that takes the thermometric readings and calculates the Calibration Value and the Heat of Combustion Values.
Balance – a laboratory balance capable of weighing the analysis sample to the nearest 0. Platinum or palladium wire, 0. Purity of Reagents – Use d8565 grade chemicals conforming to the specification of the Committee on Analytical Reagents of the American Chemical Society in all tests. Sorry, your blog cannot atm posts by email. For more details, consult the manufacturer.
The results of combustion calorimetric tests of fuel for steam power plants may be expressed in terms of the International Steam Table calorie I. To minimize convection, the sides, top and bottom of the calorimeter vessel shall not be more than 10mm from the asttm surface of the jacket. The stirrer speed shall remain constant to minimize any temperature variations due to stirring. It determines when the calorimeter is in equilibrium and ignites the sample and determines when the calorimeter has reached equilibrium after ignition.
No other units of measurement are included in this standard. Its size shall be such that the bomb xstm completely immersed in water during determination.
Standard Test Method for Gross Calorific Value of Coal and Coke
Isoperibol Calorimeter – a calorimeter that operates in the isoperibol mode and uses a microprocessor to record the initial and final temperatures and make the appropriate heat leak corrections during the temperature rise. For both subsystems, the relationship between the thermometer resistance and temperature shall be well characterized. Controller – For automated calorimeter, capable of charging the bomb; filling the calorimeter vessel; firing the ignition circuit; recording calorimeter temperature before, during and after the test; recording the balance weights; and carrying out all necessary corrections and calculations.
The mass of sample and any combustion aid as well as the pressure of the oxygen admitted to the bomb shall not exceed the bomb manufacturer’s specifications. Inspect the bomb parts carefully after each use. Leave a Reply Cancel reply Your email address will not be published. This standard does not purport to address all of the safety concerns, if any, associated with its use. The calorific value of benzoic acid, for us in the calibration calculations, shall be traceable to a recognized certificate value.
These types of thermometers consist of two major subsystems. Additional precautions are noted in Practice E Adiabatic Calorimeter – a calorimeter that operates in the adiabatic mode and may or may not use a microprocessor.
Standard – Standard Test Method for Gross Calorific Value of Coal and Coke ASTM D –
A stirrer shall be provided for uniform mixing of the water. Calorific Value – the heat produced by combustion of a unit quantity of a substance under specified conditions. Nickel-chromium alloy Chrome C alloy, cotton ashm, or iron wire are acceptable.
Unnecessary exposure of the samples to the air for the time of sampling or delay in analysis shall be avoided.
Save my name, email, and site URL in my browser for next time I post a comment. Net Calorific Value net heat of combustion at constant pressureQp net – the heat produced by combustion of a substance at a constant pressure of 0.