Due to the age and disrepair of the small air separation unit, the cold box outside the pipeline and flange, valve connections have external leakage phenomenon. This part of the trace leakage for the normal operation of the small air separation unit is not significant, but for the gas tightness of the pressure test has a significant impact. Purified air, booster air.O2, N2, WN in and out of the cold box main exchange cold box flange is the internal thread connection method, not easy to disassemble, workers will be cut in the pipeline to increase the blind plate.
According to the technical requirements of small air separation unit for each system for gas tightness test, booster system residual rate of 99.4%, low and medium pressure system residual rate of 98.3%, in line with technical requirements, after the new weld and part of the old weld flaw detection test.
After several days of commissioning and operation, the oxygen and nitrogen output of the air separation equipment met the standard, and the argon equipment produced qualified liquid argon products with the same output purity as before the overhaul. After the correction of the liquid-air analysis measurement point analysis results and liquid level at the positive pressure tube is basically the same. The oxygen meter was used to measure the western measurement point of the cold box and other locations, and the oxygen content was basically O. The upper and lower pressures of the cold box were 80, 245 and 320 respectively. no frost and ice on the surface of the cold box, which achieved the expected overhaul effect of the small air separation unit.
Innovative research and development is the cornerstone of an enterprise to maintain lasting competitiveness. Take Kaifeng DEAR Air as an example, the reason why it has a strong R & D strength in small air separation unit, large air separation unit and liquid air separation plant design. First of all, thanks to the early and international giants of long-term in-depth cooperation.
