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 to evaluate the effectiveness of beneficiation processes.
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. Do not fire the bomb if there is evidence of gas leakage when the bomb is submerged in the calorimeter vessel. Platinum or palladium wire, 0. The balance shall be checked weekly, astmm a minimum, for accuracy. Replace O-Rings and valve seats in accordance with manufacturer’s ast.
In particular, lignite and sub-bituminous rank coal samples may experience greater oxidation effects than samples of higher rank coals. The calorific value of benzoic acid, for us in the calibration calculations, shall be traceable to a recognized certificate value. Inspect the bomb parts carefully after each use. For more details, consult the manufacturer. It determines when the calorimeter is in equilibrium and ignites the sample and determines when the calorimeter has reached equilibrium after ignition.
Standard Test Method for Gross Calorific Value of Coal and Coke
Automated Calorimeter – a calorimeter which has a microprocessor that takes the thermometric readings and calculates the Calibration Value and the Heat of Combustion Values. Oxygen – Manufactured from liquid air, guaranteed to be greater than Controller – For automated calorimeter, capable of charging the bomb; ashm 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.
Also consult the calorimeter equipment manufacturer’s installation and operating instructions before using the calorimeter. The BTU used in modern steam tables is defined by the means of the relation, 1 I. Sample Holder – An open crucible or platinum, quartz, or base metal alloy.
Replace cracked or significantly worn parts. For calorimeters having a bucket it can be a separate component of the bomb.
Notify wstm of new posts by email. The magnifier shall have a lens and holder designed so as to minimize errors as a result of parallax.
ASTM D5865 – 13
Suitable reducing valves and adapters for 3- to 4-MPa to psig discharge pressure can be obtained from commercial sources xstm compressed gas equipment. 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. Net Calorific R5865 net heat of combustion at constant pressureQp net – the heat produced by combustion of a substance at a constant pressure of 0.
The gross calorific value can be used to compute the total calorific content of the quantity of coal or coke represented by the sample for payment purposes. Balance – a laboratory balance capable of weighing the analysis sample to the nearest 0. Test Area – An area free from drafts, shielded from direct sunlight and other radiation sources. Continuous stirring for 10 min shall not raise the calorimeter temperature more than 0.
Leave a Reply Cancel reply Your email address will not be published. A convenient standard solution may be prepared as follows.
Chassis Name and Number. The values stated in SI units are to be regarded as standard.
Specific hazard statements are given in Section 8. Thermometers – Platinum resistance or thermistor thermometers – shall be capable of measuring to the nearest 0. Its size shall be such that the bomb is completely immersed in water during determination.
ASTM D – 04 Standard Test Method for Gross Calorific Value of Coal and Coke
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. Gross Calorific Value gross heat of combustion at constant volumeQv gross – the heat produced by complete combustion of a substance at constant volume with all water formed condensed to a liquid.
Save my name, email, and site URL in my browser for next time I post a comment. The stirrer speed shall remain constant to minimize any temperature variations due to stirring. Mechanical supports for the calorimeter vessel shall be of low thermal conductivity. To minimize convection, the sides, top and bottom of the calorimeter vessel shall not be more than 10mm from d5856 inner surface of the jacket.
Oxidation of coal after sampling can result in a reduction of calorific value.
During ignition of a sample, the operator shall not extend any portion of the body over the calorimeter.
Sorry, your blog cannot share posts by email. Equip the oxygen supply 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.
There shall be no gas leakage. Unnecessary exposure of the samples to the air for the time of sampling or delay in analysis shall be avoided. The results of combustion calorimetric tests of fuel for steam power plants may be expressed in terms of the International Steam Table calorie I. Calorimeter Vessel – Made of metal with a tarnish-resistant coating, with all outer surfaces highly polished. A comparable amount of the analysis sample is burned under the same conditions in the calorimeter.
Thermostatic control of room temperature and controlled relative humidity are desirable. Check the pressure gauge annually for accuracy or after any accidental over pressures that reach maximum gauge pressure.