ASTM D5865 PDF
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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ASTM D – 13 – Standard Test Method for Gross Calorific Value of Coal and Coke
Use the same type and length or mass of ignition fuse for calorific value determinations as used for standardization. D8565, your blog cannot share posts by email. During ignition of a sample, the operator shall not extend any portion of the body over the calorimeter. The following precautions are recommended for safe calorimeter operation. The second and equally important aspect is the measurement subsystem.
ASTM D – 13 Standard Test Method for Gross Calorific Value of Coal and Coke
A stirrer shall be provided for uniform mixing of the water. No other units of measurement are included in this standard.
This test method pertains to the determination of the gross calorific value of coal and coke by either an isoperibol or adiabatic bomb calorimeter. Mechanical supports for the calorimeter vessel shall be of low thermal conductivity.
Specific hazard statements astj given in Section 8. Thermometers – Platinum resistance or thermistor thermometers – shall be capable of measuring to the nearest 0. Qstm comparable amount of the analysis sample is burned under the same conditions in the calorimeter. For calorimeters having a bucket it can be a separate component of the bomb. The calorific value of the analysis sample is computed by multiplying the corrected temperature rise, adjusted for extraneous heat effects, but the heat capacity and dividing by the mass of the sample.
This standard does not purport to address all of the safety concerns, if d585, associated with its use. The balance shall be checked weekly, at a minimum, for accuracy.
In particular, lignite and sub-bituminous rank coal samples may experience greater oxidation effects than samples of higher rank coals. Nickel-chromium alloy Chrome C alloy, cotton thread, or iron wire are acceptable.
British Thermal Unit BTU – is the amount of heat required to raise the temperature of one pound – mass lbm of liquid water at one atmospheric pressure one degree Fahrenheit at a stated temperature.
A convenient standard solution may be prepared as follows.
ASTM D5865 – 13
The resulting concentration 0. The vessel shall be of such construction that the environment of the calorimeter’s entire outer boundaries can be maintained at a uniform temperature. Additional precautions are noted in Practice E 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.
The first and most obvious is the temperature sensing probe itself. Unnecessary exposure of the samples to the air for the time of sampling or delay in analysis shall be avoided. 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.
There shall be no gas leakage. Base metal alloy crucibles are acceptable, if after three preliminary firings, the weight does not change by more than 0. Leave a Reply Cancel reply Your email address will not be published. For more details, consult the manufacturer. Thermostatic control of room temperature and controlled relative humidity are desirable. Oxidation of coal after sampling can result astk a reduction of calorific value. Calorific Value – the heat produced by combustion of a unit quantity of a substance under specified conditions.
Titiration Indicator – Methyl dd5865, methyl red, or methyl purple for indicating the end point when titrating the acid formed during combustion.
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. Discussion – The heat capacity can also be referred to as the energy equivalent or water equivalent of the calorimeter.
Standard Test Method for Gross Calorific Value of Coal and Coke
The magnifier shall have a lens and holder designed so as to minimize errors as a result of parallax. The gross calorific value can be used to evaluate the effectiveness of beneficiation processes. The values stated in SI units are to be regarded as standard. The results of combustion calorimetric tests of fuel for steam power plants may be expressed in terms of the International Steam Table calorie I.
The BTU used in modern steam tables is defined by the means of the relation, 1 I. Adiabatic Calorimeter – a calorimeter that operates in the adiabatic mode and may or may not use a microprocessor. Calorimeter Vessel – Made of metal with a tarnish-resistant coating, with all outer surfaces highly polished. An ammeter or pilot light can be used in the circuit to indicate when current is flowing.
Automated Calorimeter – a calorimeter which has a microprocessor that takes the thermometric readings and calculates the Calibration Value and the Heat of Combustion Values. The gross calorific value can be required to classify coals according to Classification D 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.
Ignition Fuse – Ignition fuse of mm length and 0. For manually operated calorimeters, the ignition switch shall be depressed only long enough to fire the charge. 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.
Heat Capacity – the energy required to raise the temperature of the calorimeter one arbitrary unit. It determines when the calorimeter is in equilibrium and ignites the sample and determines when the calorimeter has reached equilibrium after ignition.
Assessing the valid working range of the calorimeter, as outlined in Corrected Temperature Rise – the calorimeter temperature change caused by the process that occurs inside the bomb corrected for various effects. The same indicator shall be used for both calibration and calorific value determinations.