The burning cotton thread falls into the fuel sample below causing the sample to ignite. During the burning of the fuel sample, the crucible can momentarily rise to above Deg C with the pressure spiking to 3 x the initial pressure. With in seconds, the heat of the reaction starts to dissipate into the bomb vessel and the pressure starts to subside.
To accurately measure the temperature of the vessel, sensitive high resolution temperature sensors are used, measuring every 6 seconds for the duration of the determination. Once the determination is complete, typically within 4 minutes depending on which model you have , the calorimeter calculates the Calorific Value CV of the fuel sample.
At this point in time, the bomb vessel is removed from the bomb well to be cooled. Typically the bomb vessel is now between 8 to 14 Deg C higher in temperature. Combustion Calorimeters measure the heat released from a combustible solid-liquid substance.
This is done by weighing a precise measure of the sample substance into a crucible, placing the crucible inside a "bomb" a sealed metal cylinder called a vessel , filling the vessel with oxygen and igniting the substance. Traditionally water is used in adiabatic and isothermal combustion calorimeters. Ensure all safety precautions are taken when installing your oxygen filling station and that the vessel is filled correctly to 30 bar.
Make sure the oxygen supply is secure and that no leaks occur when filling the bomb vessel. If any leaks are detected, consult your agent , or contact us for assistance on correctly setting up the filling station and its components. High Pressure Oxygen can be dangerous if not handled correctly. Always make sure that the vessel is sealed correctly before filling with oxygen refer to the installation guide or maintenance manual for details.
Never attempt to open a bomb vessel before de-filling it removing all the oxygen from the vessel. A High Pressure Oxygen Regulator is used with the DDS Calorimeters range and is fitted to the oxygen supply when installing the system for the first time to ensure that the correct pressure of oxygen is supplied to the filling station or calorimeter if using the CAL3K-AP Calorimeter.
The high pressure regulator is an absolute MUST when installing the system and assists with the monitoring of oxygen supply to the filling station, and essentially to the bomb vessel. For the operator's safety and lab safety it must be fitted to the oxygen supply. It is an integral part of the complete calorimeter system when it comes to filling the bomb vessel with oxygen before a determination.
If a vessel is not filled correctly it could affect the combustion process within the bomb vessel during a determination, and therefore affect the final result of the analysis. Various components and consumables are used during an analysis to ensure the bomb vessel is filled with high pressure oxygen.
These components all play a part in analyzing samples and the burning of samples within the bomb vessel. The high pressure oxygen aids the burning process during combustion to analyse the final calorific value of the sample and assists with a "complete burn" during this process. Another common use of bomb calorimeters is in education training.
Calorimetry is taught in university-level science courses, as well as some high school classes. Individuals pursuing careers in a field that requires the use of bomb calorimetry must first become very familiar with the processes involved with using a bomb calorimeter.
Bomb calorimeters are used to test the calorific value of solid and liquid fuels, which are traded based on that value. Fuels such as coal and oil must meet regulations specifying the total calorific value, quality and purity of the fuel. Liquid fuels like gasoline and kerosene are also tested by bomb calorimetry. The cement industry is one of several industries that use hazardous waste as an alternative fuel.
However, the use of hazardous waste as fuel is regulated by the government, including the Environmental Protection Agency EPA. Bomb calorimetry is used to determine whether hazardous waste fuel meets those regulations and is safe and appropriate for use.
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