【Q&A Question 043】2016.06.02
Thread Content
【Q&A Question 043】June 2, 2016: What are the phenomena that occur when there is a bed temperature surge in a diesel hydrogenation reactor? The answer key will be available after responding; scoring is based on addressing the key points. 1. Hydrogen consumption increases, and the system pressure difference drops significantly. 2. The purity of the circulating hydrogen decreases, and the amount of waste hydrogen generated rises sharply. 3. The temperature rise in the bed layer increases exponentially. 4. The reaction outlet temperature rises sharply; after passing through the E102 and E101 heat exchangers, the furnace outlet temperature increases significantly. 5. If the heating time is long, the reaction cracking intensifies, the reactor pressure rises and may even exceed safe levels; rapid coking of the catalyst causes a swift increase in the pressure drop across the bed. 6. The high-temperature side temperature will rise, causing the circulator to carry liquid. 7. Increased light hydrocarbons in the fractionation system due to intensified cracking, high liquid level in the reflux tank, and a lower flash point of diesel.
The reactor outlet temperature rises sharply and out of control
The significant increase in hydrogen consumption by the system caused a rapid drop in system pressure
Phenomena after flying temperature? A bit confused. . . . . Temperature soars, pressure drops, and flow rate increases. But pressure needs to be released urgently
The pressure drops rapidly, the pressure difference across the reactor bed increases, the flow rate of recycled hydrogen decreases, the temperature of the heat exchanger at the reactor outlet rises, and the temperature at the inlet to the high-pressure section increases. This can lead to liquid presence at the inlet of the recycled hydrogen compressor, resulting in cylinder collision, among other issues; it can also cause high temperatures in the distillation section^^
Hydrogen consumption increases significantly, causing fluctuations in system pressure
The bed temperature rises rapidly, hydrogen consumption increases, and the bed pressure drop increases
Answer: 1. Hydrogen consumption increases significantly, and system pressure drops greatly. 2. Bed temperature rises. 3. The purity of the recycled hydrogen decreases, and its flow rate increases. 4. The temperature at the furnace outlet rises significantly. 5. Severe liquid carryover occurs in the recycle compressor
The bed temperature rises sharply, the cold hydrogen valve is opened wide, gas by-products increase, and the system pressure rises