The change of the middle temperature is the result of many factors, and after taking measures to adjust it, it will change other related working conditions. Therefore, the adjustment of the middle temperature of the cold accumulator (or switching heat exchanger) should have an overall concept to prevent isolated and one-sided views. We should make a comprehensive analysis of the influencing factors, grasp the main contradictions and take effective measures.DEAR Biogas purification unit.When acetylene or hydrocarbons accumulate in the local area of the main cooling system, explosion may occur under certain conditions. When this kind of slight explosion occurs, there is no external response and no sound, so it is often imperceptible at first. Only when the oxygen purity changes automatically and cannot be adjusted, can this happen.DEAR Biogas purification unit.During the charging process, some molecules (including oxygen and nitrogen molecules) are adsorbed, and the corresponding adsorption heat is carried out by air when it is used. In addition, when the adsorber was first used, the adsorption capacity of molecular sieve was large, so the temperature increased significantly, which was not due to incomplete cold blowing.
DEAR Biogas purification unit.During the regeneration of Molecular Sieve Purifier, the outlet temperature of nitrogen will continue to rise at the beginning of the cold blowing stage, forming a peak value. However, there are two or three peaks in the cold blowing curve of some adsorbers, or the whole peak is relatively flat and the peak is not obvious.The boiling point is the saturation temperature at the same pressure. They have the same meaning, but different views. The coexistence of gas and liquid is called saturation state. If the saturated steam is heated continuously, the temperature of the steam will rise. If the saturated temperature is exceeded, it is called superheated steam.DEAR Biogas purification unit.Machinery industry, mainly used for metal cutting and welding. Oxygen is used as combustion supporting agent of acetylene to produce high temperature flame and melt metal. In national defense industry, liquid oxygen is often used as the combustion supporting agent of rocket. The combustible material soaked in liquid oxygen has strong explosiveness and can be used to make liquid oxygen explosive. In addition, in the medical sector, oxygen is also an indispensable material for first aid and adjuvant treatment of patients. Therefore, oxygen production is an indispensable part of the national economy.
Test the purity of the gas escaping from the cold box. When nitrogen or liquid nitrogen leaks, the volume fraction of nitrogen in cold air can reach more than 80%; when oxygen or liquid oxygen leaks, the volume fraction of oxygen can be significantly increased.DEAR Biogas purification unit.When the purity of oxygen changes by 0.1%, the oxygen content in argon fraction will change by 0.8% ~ 1%. The argon content in argon fraction decreases with the increase of oxygen purity. The change of argon fraction directly affects the argon fraction entering the crude argon column. The higher the oxygen content in the argon fraction, the more the argon fraction entering the crude argon column. On the contrary, there will be less.DEAR Biogas purification unit.The common cases of water inflow into the accumulator (or switching heat exchanger) are as follows: the automatic water level regulation system of the air cooling tower of the nitrogen water precooling system fails, which makes the water level too high. Or improper operation, such as unreasonable start-up of air cooling tower or sudden drop of air separation tower pressure, resulting in a large number of water inflow accidents.
