【Q&A Question 014】2017.01.14
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This post was last edited by 955559 on 2017-7-21 at 12:55. [Q&A Question No. 014] 2017.01.14: What are the main factors affecting the reactor inlet temperature? The reference answers will be visible after responding; scoring is granted by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) ① Water in the feedstock ② Oil in the fuel gas and changes in component pressures ③ Interruption or fluctuations in the feedstock oil supply ④ Interruption or reduction in the flow rate of recycled hydrogen ⑤ Improper control of the temperature in the high-pressure heat exchanger or high-temperature section ⑥ Instrument failures ⑦ Changes in the temperature and properties of the feedstock oil. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html Xinchang Cup – 2016 Haichuan Top 10 Selection – Please recommend candidates http://bbs.hcbbs.com/thread-1654112-1-1.html Third Round of Haichuan Outstanding Management Members Selection http://bbs.hcbbs.com/thread-1655902-1-1.html (Source: Haichuan Chemical Forum)
Heater outlet temperature； Feed rate ； Amount of cold hydrogen
The effects of the inlet are as follows: 1. Fluctuations in the temperature of the heating furnace； 2. Large changes in heat transfer (changes in heat transfer regulation, changes in reactor outlet temperature). 3. Changes in the properties of the feed oil also have an impact; 4. Changes in the processing volume and in the amount of recycled hydrogen.
Main factors affecting the reactor inlet temperature: 1) Water content in the feed oil； 2) Fuel gas containing oil, changes in composition and pressure ； 3) Disruption or fluctuations in crude oil supply ； 4) Interruption or reduction in circulating hydrogen flow rate ； 5) Fluctuations or changes in the heat exchange efficiency of the reaction feed/outlet heat exchangers, temperature control of the high-temperature heat section, temperature control of the steam generation system, etc ； 6) Instrument failure, improper PID parameter adjustment ； The air preheater fan stopped operating, causing coking of the furnace tubes; as a result, the heat transfer efficiency of these tubes decreased ； 7) Changes in the temperature and properties of the feed oil, especially changes in the properties of the feed, cause significant variations in the heat released during the reaction; these variations, in turn, affect the temperature at the outlet of the heating furnace through the feed/effluent heat exchangers.
Raw material processing volume, raw material properties, fuel properties, circulating hydrogen flow rate
Under a constant furnace temperature, it is mainly achieved by adjusting the opening degree of the inlet valve
Heat transfer rate, feed oil temperature, gas volume,
Fluctuations in the heat exchange efficiency of the heat exchanger and the amount of circulating hydrogen； Changes in the temperature and properties of the crude oil ； The combustion, operation, and control of the heating furnace.
1. Temperature fluctuations in the heating furnace； 2. Large changes in heat transfer (changes in heat transfer regulation, changes in reactor outlet temperature). 3. Changes in the properties of the feed oil also have an impact; 4. Changes in the processing volume and in the amount of recycled hydrogen.