NOVEL PLAN OF TRIETHYLENE GLYCOL REGENERATION PACKED TOWER FOR ENERGY AND COST SAVING

作者：Farahmand Sara; Nasr Mohammad Reza Jafari^*; Farahbod Farshad

来源：Canadian Journal of Chemical Engineering, 2011, 89(3): 520-528.

DOI：10.1002/cjce.20437

• structured packing
• TEG regenerator
• BTEX emission
• mass transfer
• reboiler duty
• heat transfer
• random packing

The present study investigates the effect of structured packing internals on some important parameters such as lean triethylene glycol (TEG) concentration and benzene-toluene-ethylbenzene-xylene (BTEX) emission rates. In this case an industrial packed regenerator in dehydration unit is simulated and a related mathematical model is proposed. The model consists of non-linear differential equations of conservation of mass and energy. Delft model is used to find specifications of structured packing. Gas and liquid streams are considered as multi component and fully mixed in each section of the column. It reveals that using structured packing internals helps reaching proper TEG concentration in lower temperatures of Reboiler, it leads to a decrease in the amount of required fuel of reboiler, so that plant cost leads to lower values. The results are compared with an existing regenerator filled with random packing. Differential mass and heat balance equations are used to simulate random packed tower. Heat and mass coefficients are derived from the mentioned correlations in the literature. According to non-isothermal conditions, effective mass, and heat transfer equation coefficients are variable depending on temperature in each element. Hydrodynamic analogy approach is used for modelling of structured packing tower. It uses partial differential mass and heat transfer equations derived for each small part of tower. The equations of liquid and gas are coupled and can be solved simultaneously with acceptable accuracy.

• 出版日期2011-6