【Daily Question No. 358】December 30, 2018
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【Daily Question No. 358】December 30, 2018: Briefly describe the main precautions to be taken when removing spent hydrogenation catalysts There is no fixed answer; as long as the reasoning is sound, it’s acceptable. ①Before shutting down the system, it is necessary to confirm that there is water in the fresh water pipeline. Rubber hoses should be connected to the fresh water pipelines at the upper and lower outlets of the reactor, so as to have sufficient water to deal with any unexpected situations. Additionally, enough dry ice and fire extinguishers must be prepared. ②Nitrogen must be introduced into the reactor and a slight positive pressure maintained to exclude air. ③Before removing the catalyst, the temperature of the catalyst bed should be lowered as much as possible. If the catalyst discharged during unloading catches fire, it can be extinguished using dry ice or a fire extinguisher; if that doesn’t work, fresh water can be used to put out the fire. ④The desulfurization process is carried out when the catalyst has not been regenerated; once air enters the reactor, spontaneous combustion occurs immediately. Therefore, great care must be taken to this issue during the desulfurization process; it is essential to ensure that the reactor is properly sealed with nitrogen, and there must be a dedicated person responsible for the nitrogen system. ⑤To speed up the unloading process, the personnel and tools used at the bottom of the barrel must be well coordinated, and vehicle scheduling must be orderly and efficient. ⑥The work of removing the agent is labor-intensive and involves many construction units and personnel; therefore, all relevant parties need to coordinate with each other and cooperate actively to ensure safety. ⑦The supply of fresh water and fire-fighting water is normal. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Correct: 3 wealth, Incorrect: 1 wealth ； Mass posting of posts – rated based on the lowest score ； Replies that are unrelated to the answer are considered spam and will be deleted immediately. For management purposes, if you need to view content from a few days ago, please go to https://bbs.hcbbs.com/home.php?mod=space&uid=3862647&do=thread&view=me&from=space through the summary post below
①Before shutting down the system, it is necessary to confirm that there is water in the fresh water pipeline. Rubber hoses should be connected to the fresh water pipelines at the upper and lower outlets of the reactor, so as to have sufficient water to deal with any unexpected situations. Additionally, enough dry ice and fire extinguishers must be prepared. ②Nitrogen must be introduced into the reactor and a slight positive pressure maintained to exclude air. ③Before removing the agent, the temperature of the catalyst bed should be reduced as much as possible. If the catalyst discharged during unloading catches fire, it can be extinguished using dry ice or a fire extinguisher; if that doesn’t work, fresh water can be used to put out the fire. ④The desulfurization process is carried out when the catalyst has not been regenerated; once air enters the reactor, spontaneous combustion occurs immediately. Therefore, great care must be taken to address this issue during the desulfurization process; it is essential to ensure that the reactor is properly sealed with nitrogen, and there must be a dedicated person responsible for the nitrogen system. ⑤To speed up the unloading process, the personnel and tools used at the bottom of the barrel must be well coordinated, and vehicle scheduling must be orderly and efficient. ⑥The work of removing the agent is labor-intensive and involves many construction units and personnel; therefore, all relevant parties need to coordinate with each other and cooperate actively to ensure safety. ⑦The supply of fresh water and fire-fighting water is normal.
①Before shutting down the system, it is necessary to confirm that there is water in the fresh water pipeline. Rubber hoses should be connected to the fresh water pipelines at the upper and lower outlets of the reactor, so as to have sufficient water to deal with any unexpected situations. Additionally, enough dry ice and fire extinguishers must be prepared. ②Nitrogen must be introduced into the reactor and a slight positive pressure maintained to exclude air. ③Before removing the agent, the temperature of the catalyst bed should be reduced as much as possible. If the catalyst discharged during unloading catches fire, it can be extinguished using dry ice or a fire extinguisher; if that doesn’t work, fresh water can be used to put out the fire. ④The desulfurization process is carried out when the catalyst has not been regenerated; once air enters the reactor, spontaneous combustion occurs immediately. Therefore, great care must be taken to address this issue during the desulfurization process; it is essential to ensure that the reactor is properly sealed with nitrogen, and there must be a dedicated person responsible for the nitrogen system. ⑤To speed up the unloading process, the personnel and tools used at the bottom of the barrel must be well coordinated, and vehicle scheduling must be orderly and efficient. ⑥The work of removing the agent is labor-intensive and involves many construction units and personnel; therefore, all relevant parties need to coordinate with each other and cooperate actively to ensure safety. ⑦The supply of fresh water and fire-fighting water is normal.
①Before shutting down the system, it is necessary to confirm that there is water in the fresh water pipeline. Rubber hoses should be connected to the fresh water pipelines at the upper and lower outlets of the reactor, so as to have sufficient water to deal with any unexpected situations. Additionally, enough dry ice and fire extinguishers must be prepared. ②Nitrogen must be introduced into the reactor and a slight positive pressure maintained to exclude air. ③Before removing the catalyst, the temperature of the catalyst bed should be lowered as much as possible. If the catalyst discharged during unloading catches fire, it can be extinguished using dry ice or a fire extinguisher; if that doesn’t work, fresh water can be used to put out the fire. ④The desulfurization process is carried out when the catalyst has not been regenerated; once air enters the reactor, spontaneous combustion occurs immediately. Therefore, great care must be taken to this issue during the desulfurization process; it is essential to ensure that the reactor is properly sealed with nitrogen, and there must be a dedicated person responsible for the nitrogen system. ⑤To speed up the unloading process, the personnel and tools used at the bottom of the barrel must be well coordinated, and vehicle scheduling must be orderly and efficient. ⑥The work of removing the agent is labor-intensive and involves many construction units and personnel; therefore, all relevant parties need to coordinate with each other and cooperate actively to ensure safety. ⑦The supply of fresh water and fire-fighting water is normal.
①Before shutting down the system, it is necessary to confirm that there is water in the fresh water pipeline. Rubber hoses should be connected to the fresh water pipelines at the upper and lower outlets of the reactor, so as to have sufficient water to deal with any unexpected situations. Additionally, enough dry ice and fire extinguishers must be prepared. ②Nitrogen must be introduced into the reactor and a slight positive pressure maintained to exclude air. ③Before removing the agent, the temperature of the catalyst bed should be reduced as much as possible. If the catalyst discharged during unloading catches fire, it can be extinguished using dry ice or a fire extinguisher; if that doesn’t work, fresh water can be used to put out the fire. ④The desulfurization process is carried out when the catalyst has not been regenerated; once air enters the reactor, spontaneous combustion occurs immediately. Therefore, great care must be taken to address this issue during the desulfurization process; it is essential to ensure that the reactor is properly sealed with nitrogen, and there must be a dedicated person responsible for the nitrogen system. ⑤To speed up the unloading process, the personnel and tools used at the bottom of the barrel must be well coordinated, and vehicle scheduling must be orderly and efficient. ⑥The work of removing the agent is labor-intensive and involves many construction units and personnel; therefore, all relevant parties need to coordinate with each other and cooperate actively to ensure safety. ⑦The supply of fresh water and fire-fighting water is normal.
①Before shutting down the system, it is necessary to confirm that there is water in the fresh water pipeline. Rubber hoses should be connected to the fresh water pipelines at the upper and lower outlets of the reactor, so as to have sufficient water to deal with any unexpected situations. Additionally, enough dry ice and fire extinguishers must be prepared. ②Nitrogen must be introduced into the reactor and a slight positive pressure maintained to exclude air. ③Before removing the agent, the temperature of the catalyst bed should be reduced as much as possible. If the catalyst discharged during unloading catches fire, it can be extinguished using dry ice or a fire extinguisher; if that doesn’t work, fresh water can be used to put out the fire. ④The desulfurization process is carried out when the catalyst has not been regenerated; once air enters the reactor, spontaneous combustion occurs immediately. Therefore, great care must be taken to address this issue during the desulfurization process; it is essential to ensure that the reactor is properly sealed with nitrogen, and there must be a dedicated person responsible for the nitrogen system. ⑤To speed up the unloading process, the personnel and tools used at the bottom of the barrel must be well coordinated, and vehicle scheduling must be orderly and efficient. ⑥The work of removing the agent is labor-intensive and involves many construction units and personnel; therefore, all relevant parties need to coordinate with each other and cooperate actively to ensure safety. ⑦The supply of fresh water and fire-fighting water is normal.
Before removing the agent, it should be confirmed that there is water in the fresh water pipeline, at the upper and lower outlets of the reactor.
Before removing the agent, it should be confirmed that there is water in the fresh water pipeline, at the upper and lower outlets of the reactor.
①Before shutting down the system, it is necessary to confirm that there is water in the fresh water pipeline. Rubber hoses should be connected to the fresh water pipelines at the upper and lower outlets of the reactor, so as to have sufficient water to deal with any unexpected situations. Additionally, enough dry ice and fire extinguishers must be prepared. ②Nitrogen must be introduced into the reactor and a slight positive pressure maintained to exclude air. ③Before removing the agent, the temperature of the catalyst bed should be reduced as much as possible. If the catalyst discharged during unloading catches fire, it can be extinguished using dry ice or a fire extinguisher; if that doesn’t work, fresh water can be used to put out the fire. ④The desulfurization process is carried out when the catalyst has not been regenerated; once air enters the reactor, spontaneous combustion occurs immediately. Therefore, great care must be taken to this issue during the desulfurization process; it is essential to ensure that the reactor is properly sealed with nitrogen, and there must be a dedicated person responsible for the nitrogen system. ⑤To speed up the unloading process, the personnel and tools used at the bottom of the barrel must be well coordinated, and vehicle scheduling must be orderly and efficient. ⑥The work of removing the agent is labor-intensive and involves many construction units and personnel; therefore, all relevant parties need to coordinate with each other and cooperate actively to ensure safety. ⑦The supply of fresh water and fire-fighting water is normal.
①Before shutting down the system, it is necessary to confirm that there is water in the fresh water pipeline. Rubber hoses should be connected to the fresh water pipelines at the upper and lower outlets of the reactor, so as to have sufficient water to deal with any unexpected situations. Additionally, enough dry ice and fire extinguishers must be prepared. ②Nitrogen must be introduced into the reactor and a slight positive pressure maintained to exclude air. ③Before removing the agent, the temperature of the catalyst bed should be reduced as much as possible. If the catalyst discharged during unloading catches fire, it can be extinguished using dry ice or a fire extinguisher; if that doesn’t work, fresh water can be used to put out the fire. ④The desulfurization process is carried out when the catalyst has not been regenerated; once air enters the reactor, spontaneous combustion occurs immediately. Therefore, great care must be taken to address this issue during the desulfurization process; it is essential to ensure that the reactor is properly sealed with nitrogen, and there must be a dedicated person responsible for the nitrogen system. ⑤To speed up the unloading process, the personnel and tools used at the bottom of the barrel must be well coordinated, and vehicle scheduling must be orderly and efficient. ⑥The work of removing the agent is labor-intensive and involves many construction units and personnel; therefore, all relevant parties need to coordinate with each other and cooperate actively to ensure safety. ⑦The supply of fresh water and fire-fighting water is normal.
①Since the active form of the hydrogenation catalyst tends to oxidize easily, N2 is used to cool it down to room temperature； ②Nitrogen protection should be applied during unloading ； ③Try to minimize the number of openings to avoid the \"chimney effect,\" which can cause overheating of the catalyst bed ； ④Be prepared to spray water.