First, the core principle and application scenarios of the oxygen bomb calorimeter

Oxygen bomb calorimeter is a special instrument for measuring the calorific value of solid, liquid fuels and combustibles. The core principle is to fully burn the sample in an oxygen bomb filled with high-pressure oxygen, and calculate the calorific value of the sample by measuring the heat released by combustion. It is widely used in heat detection in coal, chemical, energy and other industries.

II. Necessary preparations before operation

1. Instrument inspection: Before starting, it is necessary to confirm that the appearance of the oxygen bomb is free of deformation, the sealing ring is intact and free of aging, the ignition electrode is free of oxidation, and the inside of the oxygen cartridge is clean without residual debris to ensure that the components of the instrument are in normal condition.

2. Sample preparation: The sample needs to be ground to the specified fineness and fully dried, an appropriate amount of sample is accurately weighed with a balance, and placed in a burning dish to avoid too much or too little sample affecting the measurement results.

3. Oxygen preparation: Select oxygen with purity ≥ 99.5%, the oxygenation pressure is controlled at 2.8-3 MPa, and the oxygenation time is not less than 15 seconds to ensure sufficient oxygen in the oxygen bomb and ensure that the sample is fully burned.

III. Core steps of standardized operation

1. Sample loading and oxygenation: Fix the combustion dish containing the sample on the electrode holder in the oxygen bomb, install the ignition wire and connect the electrodes, then put the oxygen bomb into the host of the calorimeter, and connect the oxygenation device to complete the oxygenation. During the operation, it is necessary to handle it with care to prevent damage to the oxygen bomb components.

2. Parameter setting and start-up: Turn on the instrument power supply, set the appropriate parameters according to the sample type, and start the measurement program after confirming that it is correct. The instrument will automatically complete the ignition, temperature measurement, calculation and other processes. Do not interrupt the program at will during the process.

3. Results reading and recording: After the measurement is completed, the instrument will display the calorific value of the sample cartridge. After the oxygen bomb cools to room temperature, remove the oxygen bomb and check whether the combustion is complete. After confirming that it is correct, record the measurement data and file it well.

IV. Maintenance and precautions after operation

After the operation is completed, it is necessary to clean up the residual burning ashes in the oxygen bomb in time, wipe the inner and outer surfaces of the oxygen bomb with a soft cloth, and regularly calibrate the heat capacity of the instrument to ensure the detection accuracy. At the same time, the operator needs to strictly abide by the operating specifications to avoid stacking flammable and explosive materials around the instrument to ensure the safety of operation.

Mastering the standard operation process of the oxygen bomb calorimeter can not only ensure the accuracy of the detection data, but also prolong the service life of the instrument, help various industries to complete the heat detection work efficiently, and provide reliable support for production quality control.