Analysis And Optimization For EO/EG Device

The thesis describes the assessment for the energy consumption of the EO/EG plant of Petrochina Liaoyang. By comparing between the actual energy consumption and designed energy consumption, the different equipment and sections in the plant which have actual energy consumption that is higher than designed were identified. The causes of higher energy consumption of the identified equipment and sections can be analyzed through mass and heat balance and methods of interpolation. The methodology to reduce the energy consumption was proposed.Based on the study for energy consumption in the plant, the actual energy consumption was457kgEO/tEOE which was significantly higher than the designed energy consumption of340kgEO/tEOE. Further study revealed that the energy consumption of the carbon dioxide stripper bottom heat exchanger E-204, the EO stripper bottom heat exchanger E-210, the MEG purification column bottom heat exchanger E-508and the steam jet refrigerator Z-601was much higher than what was designed. The root causes for the higher-than-designed energy consumption of the above equipment were determined to be due to the passing steam traps for E-204and E-508, the poor heat exchanger efficiency of the EO stripper preheat exchanger E-209and Z-601not been able to operate under designed conditions.In order to tackle the high energy consumption of the plant, technical revamp and process optimization projects were implemented. After the completion of these projects in2010, the energy consumption was reduced from457kgEO/tEOE to310kgEO/tEOE. The successful implementation of the revamp and optimization projects resulted in lowered energy consumption and increased the competitiveness of EO production of the plant.