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Tham khảo tài liệu 'arnold, k. (1999). design of gas-handling systems and facilities (2nd ed.) episode 1 part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 136 Design of Gas-Handling Systems and Facilities with the liquid is known the composition of the feed to this ưay is also known. This is the composition of the liquid falling from Tray 1. 5. Calculate the temperature of Tray 1. From an enthalpy balance the temperature of the liquid falling from Tray 1 and thus the temperature of the flash on Tray 1 can be calculated. The composition is known the enthalpy can be calculated. Enthalpy must be maintained so the enthalpy of the liquid of known composition falling fom Tray 1 must equal the sum of the enthalpies of the liquid and gas flashing from it at known temperature. 6. This procedure can then be carried on up the tower to Tray N which establishes the temperature of the inlet and the gas outlet composition. 7. From the composition of the inlet and gas outlet the liquid outlet composition can be calculated and compared to that assumed in step 1. 8. The temperature or number of trays can then be varied until the calculated outlet liquid composition equals the assumed composition ưnd the vapor pressure of the liquid is equal to or less than that assumed. If the vapor pressure of the liquid is too high the bottoms temperature must be increased. DISTILLATION TOWER WITH REFLUX Figure 6-5 shows a stabilizer with reflux. The well fluid is heated with the bottoms product and injected into the tower below the top where the temperature in the tower is equal to the temperature of the feed. This minimizes the amount of flashing. In the tower the action is the same as in a cold-feed stabilizer or any other distillation tower. As the liquid falls Figure 6-5. Stabilizer with reflux and feed bottoms heat exchanger. Condensate Stabilization 137 through the tower it goes from tray to tray and gets increasingly richer in the heavy components and increasingly leaner in the light components. The stabilized liquid is cooled in the heat exchanger by the feed stream before flowing to the stock tank. At the top of the tower any intermediate
