Questions answered by tar distillation experts: (control indicator)
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Dear sea friends: Show us your factory’s tar distillation control indicators (one-tower continuous distillation) and our factory’s process indicators: The oil outlet of the first stage is 115℃, the oil outlet of the second stage is 395-405℃, the top temperature of the second stage is 358-362℃ (no anthracene oil reflux, it will be restored soon, the reflux pump used to have a large flow rate and could not be used), the bottom temperature of the second stage is 370-375℃ (with a little superheated steam added), the top temperature of the distillation tower is 110-115℃, the triple-mixed oil side line is 220-225℃ (the 27th layer is cut) The bottom temperature of the fraction tower is 300-305°C (no superheated steam is added). Product quality indicators: The softening point of asphalt is 88-92℃, the toluene incompatibility is 17-18.5, and the outflow rate of anthracene oil before 300℃ is less than 10%. The unwashed initial boiling point is 190-200℃, the dry point is 310-325℃, the naphthalene content is 40-45%, and the outflow before 300℃ is 90-94%. The main reason is that the work point and process are not enough. Please analyze the following reasons. As well as the indicators and quality of your factory. This post was last edited by ryn on 2009-3-22 08:18 ]
The dry point (high) and distillation range of the three-mixture are unqualified. The reason is very simple, that is, the temperature of the three-mixture extraction side line of the distillation tower is high (220--225 degrees), and then adjust it downwards.； The temperature of the three-mixture production side of the fraction tower is determined by the three-mixture dry point and distillation range.
Lower the second stage oil temperature by 10℃ and see the effect
Control the output of the three-mixture. The temperature at the top of the distillate column should be controlled at the lower limit. It is recommended that the dry point of the three-mixture be controlled between 290-295 degrees. Make a sample to see what the results are and then make adjustments.
Dear sea friends: The useful life of the distillation column trays is a long time. I feel that the efficiency of the lower part of the distillation column is not good.
The efficiency of the lower part of the fraction column is not good. You can judge by checking the dropping point of anthracene and the dry point of three mixtures.
To put it simply, the adjustment of the three-mixture distillation range (dry point) is to adjust the temperature of the three-mixture side line outlet.: High dry point --- Reduce the outlet temperature of the tertiary mixture, Low dry point ----------- Raise the outlet temperature of the tertiary mixture until the dry point reaches the requirement, then stabilize this temperature. The distillation operating temperature system is the quality system
The simple way is to adjust the three-mix amount