【Q&A Question 151】2018.05.31
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【Q&A Question 151】May 31, 2018: Briefly describe the phenomena that occur when a large amount of water is present in the raw materials. Why? Phenomena: ① The load on the heating furnace increases; ② System pressure rises and fluctuates; ③ The level in the low-pressure separator goes up. Reasons: ① The latent heat of vaporization of water is very high; ② The volume of water increases significantly after it vaporizes; ③ Water does not participate in the reaction throughout the process, and it is ultimately discharged from the low-pressure separator. (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. The APP short-video skill competition has begun! https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1951670
Phenomenon: Increased load on the heating furnace； System pressure rises and fluctuates ； The interface of the high-pressure separator rises. Reason: The latent heat of vaporization of water is very high ； The volume increases significantly when water vaporizes ； Water does not participate in the reaction throughout the entire process, and is ultimately discharged from the high-pressure separator.
1. The feed pump becomes evacuated, and the water heats up and vaporizes under the action of the high-speed impeller； 2. Changes in the reactor inlet temperature; water has a higher heat capacity than oil, resulting in fluctuations in the temperature at the outlet of the heater ； 3. Fluctuations in system pressure: the volume increases significantly after water vaporizes ； 4. The pressure drop across the bed increases; free water continuously condenses and vaporizes on the bed, resulting in the destruction of the catalyst carrier, and in severe cases, the bed collapses ； 5. Catalyst metal coalescence
Phenomenon: Increased load on the heating furnace； System pressure rises and fluctuates ； The interface of the high-pressure separator rises. Reason: The latent heat of vaporization of water is very high ； The volume increases significantly when water vaporizes ； Water does not participate in the reaction throughout the entire process, and is ultimately discharged from the high-pressure separator.
The grouped flow rate and total feed flow rate of the furnace are unstable; the inlet pressure and reaction pressure of the furnace increase, while the outlet temperature drops.
Phenomena: a. Increased load on the heating furnace; b. Rising system pressure with fluctuations; c. Rise in the level in the high-pressure separator. Reasons: a. The latent heat of vaporization of water is very high; b. The volume of water increases significantly upon vaporization; c. Water does not participate in the reaction throughout the process and is ultimately discharged from the high-pressure separator.
Phenomena: ① Increased load on the heating furnace; ② Rising system pressure with fluctuations; ③ Rise in the level in the low-pressure separator. Reasons: ① The latent heat of vaporization of water is very high; ② The volume increases significantly when water vaporizes; ③ Water does not participate in the reaction throughout the process and is ultimately discharged from the low-pressure separator
Phenomena: 1. The load on the heating furnace increases; 2. System pressure rises and fluctuates; 3. The level in the high-pressure separator increases. Reasons: 1. The latent heat of vaporization of water is very high; 2. The volume of water increases significantly after it vaporizes; 3. Water does not participate in the reaction during the entire process, and is ultimately discharged from the high-pressure separator.
Phenomena: ① Increased load on the heating furnace; ② Rising system pressure with fluctuations; ③ Rise in the level in the low-pressure separator. Reasons: ① The latent heat of vaporization of water is very high; ② The volume increases significantly when water vaporizes; ③ Water does not participate in the reaction throughout the process and is ultimately discharged from the low-pressure separator.
Water vaporizes at high temperatures, causing the system pressure to rise. It will reduce the reaction depth. Water can damage the catalyst, reducing it to elemental metal.
1. The feed pump becomes evacuated, and the water heats up and vaporizes under the action of the high-speed impeller； 2. Changes in the reactor inlet temperature; water has a higher heat capacity than oil, resulting in fluctuations in the temperature at the outlet of the heater ； 3. Fluctuations in system pressure: the volume increases significantly after water vaporizes ； 4. The pressure drop across the bed increases; free water continuously condenses and vaporizes on the bed, resulting in the destruction of the catalyst carrier, and in severe cases, the bed collapses ； 5. Catalyst metal coalescence