Temperature control method for hydrogenation reactor
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Is there any other way besides setting the cold hydrogen flow to its maximum? How exactly to make the adjustments? Turn off the furnace and adjust the circulation rate?
Do you mean a shutdown for cooling down, or an accident situation? In such cases, the control valve of the cooling circuit can be opened to its maximum position. After the heating furnace is turned off, the flue dampers should be gradually opened fully, while the return control valve of the recycle hydrogen compressor should be gradually closed in order to increase the speed and raise the system pressure； If there is heat exchange between a high-pressure heat exchanger and a distillation system, the cold circuit should be fully opened. If there is a valve before the recycled hydrogen enters the high-pressure heat exchanger, close it to half to increase the amount of cold hydrogen. Reduce the high-temperature outlet temperature to lower the temperature of the circulating hydrogen.
1. Reduce the outlet temperature of the reaction heating furnace. 2. Use the high-cooling-path control valve to reduce the inlet temperature of the reaction furnace. 3. Consider the properties of the crude oil; if the problem is caused by poor quality of the crude oil, contact the tank area to adjust the feedstock, or increase the circulation rate within the plant. 4. If temperature control is not timely and overheating occurs, emergency pressure relief can be activated, and emergency shutdown procedures should be followed.
I agree with the above statement. It should be noted, however, that if the temperature isn’t too high, cold hydrogen cannot be used at full capacity; during normal operation, the opening degree is generally no more than 60%, to leave room for cooling in case of an emergency. In an emergency, it’s still necessary to relieve pressure promptly
The above five points are already quite detailed. It should be noted, however, that rapidly cooled hydrogen is used in emergency situations and is generally not employed as a means of adjustment; it is not turned on during normal production. Slightly more may be used in winter, but the degree of activation does not exceed 1%. The main method of adjustment is still to control the reactor inlet temperature. Reduce pressure while ensuring product quality
Adjust the raw material ratios by using less coker diesel and keeping the temperature at the exit of the reaction furnace lower; however, it depends on the specific process you are using We have both pre-furnace hydrogen mixing and post-furnace hydrogen mixing.
Even when cold hydrogen is used at maximum, the temperature cannot be reduced by 10 degrees, which still has an impact on the reaction. In normal production, the temperature rise should not exceed 80 degrees; it’s best not to use cold hydrogen at all. If the bed temperature rises too high, it’s best to lower the temperature at the furnace outlet. As a second option, adjust the composition of the feed materials by using more catalytic fuel or regular fuel. It’s best not to rely on adjusting the cooling pathways. If the pipeline design already includes hydrogen mixing, that’s fine; but if there is no such design, it will lead to fluctuations in the temperature at the furnace outlet and uneven mixing of the feed materials, which further hinders temperature reduction