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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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. Leave a Reply Cancel reply Your email address will not be published.
Sorry, your blog cannot share posts by email. Heat Capacity – the energy required to raise the temperature of the calorimeter one arbitrary unit. The calorific value of benzoic acid, for us in the calibration calculations, shall be traceable to a recognized certificate value. In particular, lignite and sub-bituminous rank coal samples may experience greater oxidation effects than samples of higher rank coals.
Thermostatic control of room temperature and controlled relative humidity are desirable. The vessel shall be of such construction that the environment of the calorimeter’s entire outer boundaries can be maintained at a uniform temperature.
ASTM D – International Standards
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. Your email address will not be published. Astmm of Reagents – Use reagent grade chemicals conforming to the dd5865 of the Committee on Analytical Reagents of the American Chemical Society in all tests.
The following precautions are recommended for safe calorimeter operation. The second and equally important aspect is the measurement subsystem. Ignition Fuse – Ignition fuse of mm length and 0.
Additional precautions are noted in Practice E 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 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.
ASTM D5865-12 – International Standards
Thermometers – Platinum resistance or thermistor thermometers – shall be capable of measuring to the nearest 0. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. This test method pertains to the determination of the gross calorific value of coal and coke by either an isoperibol or adiabatic bomb calorimeter.
Oxidation of coal after sampling can result in a reduction of calorific value. The gross calorific value can be used to evaluate the effectiveness of beneficiation processes.
Inspect the bomb parts carefully after each use. Heat of Formation – the change in heat content resulting from the formation of 1 mole of a substance from its elements at constant pressure. Also consult the calorimeter equipment manufacturer’s installation and operating instructions before using the calorimeter. Do not fire the bomb if there is evidence of gas leakage when the bomb is submerged in the calorimeter vessel.
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. Calorimeter – a device for measuring calorific value consisting of a bomb, its contents, a vessel for holding the bombtemperature measuring devicesignition leads, water, stirrer, and a jacket maintained at specified temperature conditions.
The traceability of the heat of combustion of the benzoic acid calibrant in addition to meeting the aforementioned criteria. During ignition of a sample, the operator shall not extend any portion of the body over the calorimeter. The values stated in SI units are to be regarded as standard.
Standard Test Method for Gross Calorific Value of Coal and Coke
Nickel-chromium alloy Chrome C alloy, cotton thread, or iron wire are acceptable. Isoperibol Calorimeter – a calorimeter ashm operates in zstm isoperibol mode and uses a microprocessor to record the initial and final temperatures and make the appropriate heat leak corrections during the temperature rise. Equip the oxygen d865 cylinder with an approved type of safety device, such as a relief valve, in addition to the needle valve and pressure gauge used in regulating the oxygen feed of the bomb.
For manually operated calorimeters, the ignition switch shall be depressed only long enough to fire the charge. Replace cracked or significantly worn parts. The heat capacity of the calorimeter is determined by burning a specified mass of benzoic acid in oxygen. Notify me of new posts by email.
Automated Calorimeter – a calorimeter which ashm a microprocessor that takes the thermometric readings and calculates the Calibration Value and the Heat of Combustion Values. Chassis Name and Number. Replace O-Rings and astk seats in accordance with manufacturer’s instruction.
Suitable reducing valves and adapters for 3- to 4-MPa to psig discharge pressure can be obtained from commercial sources of compressed gas equipment. Adiabatic Calorimeter – a calorimeter that operates in the adiabatic mode and may or may not use a microprocessor.
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.
Test Area – An area free from drafts, shielded from direct sunlight and other radiation sources. For calorimeters having a bucket it can be a separate component of the bomb.
For manually operated calorimeters, the ignition circuit switch shall be of the momentary double-contact type, normally open except when held closed by the operator. It determines when the calorimeter is in equilibrium and ignites the sample and determines when the calorimeter has reached equilibrium after ignition.
Crucible Liner – Quartz fiber or alundum for lining the crucible to promote complete combustion of samples that do not burn completely during the determination of the calorific value. Corrected Temperature Rise – the calorimeter temperature change caused by the process that occurs inside the bomb corrected for various effects.