【Q&A Question 018】2016.05.08
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【Q&A Question 018】May 08, 2016: What are the requirements for using quenched hydrogen during normal operations? The answer key will be available after responding; scoring is based on answering the key points. 1. When the temperature rise is not significant, try to maintain a constant flow rate. 2. During normal operation, avoid opening the cold hydrogen valve too wide, so that it will be less effective in case of an accident. 3. When operating the valves, do so slowly, both when opening and closing them.
Prevent temperature spikes, protect the catalyst, and protect the equipment.
In principle, the use of quench hydrogen should be avoided; it is only used to protect the catalyst when other methods fail to keep the catalyst bed temperature above 30°C.
This post was last edited by zhaozq2015 on 2016-5-8 07:47. 1. When the temperature rise is not significant, try to maintain a certain flow rate; 2. During normal operation, avoid opening the cold hydrogen valve too wide, so that it will be less effective in case of an accident; 3. When operating the valves, do so slowly, both when opening and closing them.
The switching speed should not be too fast, in order to avoid significant effects on the hydrogen mixing level and to maintain a stable temperature across the reactor bed
Maintain a stable flow rate to prevent large fluctuations in bed temperature. The rapid cooling hydrogen valve should be kept at a certain opening degree, generally not exceeding 60%, to ensure there is sufficient margin in the event of an accident.
This post was last edited by wangld on 2016-5-8 07:56. 1. When the temperature rise is not significant, try to maintain a certain flow rate； 2. In normal operation, try not to open the cold hydrogen valve too far to ensure that increasing its opening degree does not have little effect in the event of an accident ； 3. When operating valves normally, open and close them slowly.
What are the requirements for quench hydrogen during normal operation? Answer: Limiting the reaction temperature of the catalyst bed to a certain range prevents the occurrence of ‘temperature spikes’, thus protecting the catalyst and the equipment. During normal operation, care should be taken to ensure that the opening degree of the rapid cooling hydrogen control valve is not too large; a certain margin should be left for use in case of emergencies.
What are the requirements for quench hydrogen during normal operation? Answer: (1) When the temperature rise is not significant, try to maintain a constant flow rate; (2) During normal operation, avoid opening the cold hydrogen valve too wide, so that it will be less effective in case of an accident; (3) When operating the valve, do so slowly, both when opening and closing it.
Used when temperature rise is difficult to control, to prevent overheating.
The opening degree of the control valve for the rapidly cooled hydrogen should not be too large