Oxygen bomb calorimeter use skills - oxygen bomb air tightness inspection
Oxygen bombs have always been the core components of the combustion (oxygen bomb) calorimeter. When measuring, the oxygen bomb will be filled with 30 bar of oxygen; when burning, the center point temperature can be as high as 1200 ° C, and the oxygen bomb pressure will be short. When the time rises to nearly 100 bar, the heat generated when the sample burns will be first absorbed by the oxygen bomb and spread to the outside through the oxygen bomb. Therefore, oxygen bomb has always been an important direction for the development and innovation of combustion calorimetry technology. Since the birth of the oxygen bomb calorimeter in 1881, research on oxygen bomb structure, oxygen bomb material, oxygen bomb weight, etc. has been promoting combustion calorimetry technology. development of.
The early oxygen bombs were constructed with four or three heads, that is, there were oxygenation ports, venting ports, and two interfaces of the ignition electrodes on the oxygen bomb cover, but because the oxygen bombs required pressure, the oxygen bombs Each additional interface adds extra risk. Therefore, the current oxygen bombs will be oxygenated in the structure, the venting interface will be merged, the ignition circuit will only retain one electrode, and the other end will be connected to the oxygen bomb to form a loop, thereby increasing oxygen. The safety of the bomb.
When burning, the heat will gradually gather to the top of the oxygen bomb, and spread mainly from the top. Different oxygen bomb weights and oxygen bomb wall thickness will also affect the heat transfer. In order to accelerate the heat transfer rate, the measurement is shortened. Time, the new type of oxygen bomb adopts the reverse button structure, the screw connection part of the oxygen bomb is placed on the bottom of the oxygen bomb, and the warhead part adopts a spherical design to form a better heat dissipation surface. Reduce the weight of the oxygen bomb while meeting the water pressure test.
In the daily inspection work, the oxygen bomb air tightness is always checked by the operator. First, if the rubber parts such as the seal ring are worn out, the oxygen bomb threads and the like wear out, and air leakage may occur, which may be difficult. Visually observe the smile leak detected by the ear. If the oxygen leaks when the pressure is less than 30 bar, the combustion of the sample may not be complete. The most intuitive performance is that the parallel measurement results are highly variable, and the repeated measurement cannot be achieved. Claim. The air tightness check at this time is very simple. The oxygen bomb is manually oxygenated and then immersed in water to observe whether there is a bubble leak.
Second, when the oxygen bomb passes through thousands of ignitions and thousands of times of high temperature-cooling process, the material of the oxygen bomb may have fatigue aging problem. At this time, the operator's personal safety will have potential risks, so All standards require that the oxygen bomb must be subjected to a compression test after two years of use or one thousand ignition tests. The test will fill the oxygen bomb with water and pressurize it to more than 200 bar for a certain period of time before and after the pressure. The deformation of the diameter of the cover, threaded ring and projectile cannot exceed the limit value . The compression test of the oxygen bomb is a destructive test. If the plastic bomb is plasticized and deformed during the pressing process, the oxygen bomb can only be scrapped. . Of course, as the German company IKA, which has always been known for its quality, our oxygen bombs are made of German-made 1.4462 stainless steel. During the years of oxygen bomb pressure testing, no plastic deformation has occurred. Failure of the stress test.
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