The core requirements for oxygen in a calorimeter

A calorimeter is a key device for accurately measuring the calorific value of a substance. Its core reaction relies on sufficient and standard oxygen supply, and the quality of oxygen directly affects the accuracy of the experimental data. The core requirements of a calorimeter for oxygen are concentrated in three aspects: purity, pressure and impurity content, all of which are indispensable.

Purity is the key metric.

The purity of oxygen used in the calorimeter must be ≥ 99.5%, which is the basis for ensuring the full combustion of the substance. If the purity of oxygen is insufficient, the sample will not burn completely, and the measured calorific value will be low, which cannot truly reflect the energy properties of the substance. High-purity oxygen can ensure that the sample reacts thoroughly in the oxygen bomb, providing reliable data support for the experiment.

The pressure needs to be stable and controllable

The oxygen pressure needs to be stabilized in the range of 3.0MPa-4.0MPa. If the pressure is too low, it will lead to insufficient oxygen supply and prolong the combustion time. If the pressure is too high, it may cause safety hazards and even damage the oxygen bomb components. Check the oxygen cylinder pressure before the experiment to ensure that the pressure is stable within the specified range to ensure the safety and smooth progress of the experiment.

The impurity content is strictly limited

Impurities such as moisture and oil in oxygen can seriously affect the experimental results. Moisture absorbs combustion heat, resulting in deviation in calorific value calculation; oil pollution may participate in combustion, introducing additional heat errors. Therefore, the oxygen used in the calorimeter needs to be dried and purified to ensure that the impurity content meets the standards and avoids interfering with the experimental accuracy.

Selection and use of dedicated oxygen

The calorimeter must use industrial high-purity oxygen or special experimental oxygen, and cannot use ordinary industrial oxygen or medical oxygen instead. The special oxygen has been strictly purified and the impurity content is extremely low, which can meet the precise experimental needs of the calorimeter. When using, the pressure needs to be adjusted through a special pressure reducing valve, and the interface is sealed when connecting the oxygen bomb to prevent oxygen leakage.

summarize

The oxygen used in the calorimeter needs to strictly follow the standards of purity ≥ 99.5%, pressure 3.0MPa-4.0MPa, and extremely low impurity content, and choose special high-purity oxygen. Only by controlling the quality of oxygen can we ensure the accuracy of the experimental data of the calorimeter and provide a reliable basis for scientific research and production. Mastering these core standards can easily complete the correct selection and use of oxygen for the calorimeter.