Abstract:

 Cracking gas dryer is an important piece of equipment in ethylene plant which adopts cryogenic separation technology. Starting from the fact that the actual operation cycle of cracking gas dryer is shorter than the design cycle, the process flow of dryer and the molecular sieve regeneration dehydration process were analyzed. It was found that the main factors limiting the operation cycle of dryer include the temperature of cracking gas to dryer, the operating conditions in regeneration stage of dryer and the regeneration frequency. By carrying out bed water penetration test, adjusting the temperature of cracking gas, optimizing the regeneration steps and reducing the regeneration frequency, the operation cycle of cracking gas dryer in ethylene plant was prolonged in the first year after overhaul, the consumption of high pressure steam was reduced, and the goal of cost reduction and efficiency increase was achieved.

Key words:

dryer')">">dryer, molecular sieve, operation cycle')">">cycle, optimization ')">">optimization