[Q&A Question 247] 2017.09.05
Thread Content
【Q&A Question 247】September 5, 2017: What are the reasons for fluctuations in the outlet temperature of the diesel hydrogenation reactor? (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) The answers to the daily questions change, and today’s answers are shown in subsequent questions. For management purposes, if you need to view content from a few days ago, please go through the summary post below. 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 (Source: Haichuan Chemical Industry Forum)
1. Nozzle blockage 2. Fuel with liquid content 3. Fuel fluctuations 4. Thermocouple failure 5. Insufficient supply
The composition and pressure of the fuel gas in the heating furnace, as well as changes in raw material flow rate and hydrogen mixing flow rate, etc.
Changes in raw material quantity； Changes in raw material ratios ； System pressure changes ； Changes in the properties of the raw materials lead to changes in the bed temperature, which in turn results in changes in the reactor outlet temperature ； Temperature changes in crude oil caused by tank separation in the crude oil storage area ；
The composition and pressure of the fuel gas in the heating furnace, as well as changes in raw material flow rate and hydrogen mixing flow rate, etc.
⑴Changes in the temperature, flow rate, and properties of the crude oil fed into the furnace. ⑵ Changes in fuel oil pressure or properties ； Changes in fuel gas pressure or fuel gas containing oil. ⑶ Automatic instrument control has failed. ⑷ External climate changes. ⑸ Flame temperature variation.
Feed rate, fuel gas, circulating hydrogen flow rate, changes in raw material properties, water content in raw materials
Changes in the composition and pressure of the fuel gas in the heating furnace, changes in raw material flow rate, changes in hydrogen blending flow rate, etc
Bias flow, uneven burning, and coking – bias flow can be adjusted through control valves, uneven burning can be controlled by observing the combustion in the burner, while coking is the most troublesome issue; the only solution is to shut down the equipment to remove the carbon deposits
1. Fluctuations in reaction feed rate； 2. Pressure fluctuations in the reaction system ； 3. Significant fluctuations in the amount of recycled hydrogen ； 4. Fluctuations in the system’s gas flow rate and composition ； 5. Fault in the temperature control valve of the high-pressure heat exchanger ； 6. Instrument failure
The properties of the raw materials have changed； The composition of the fuel gas has changed ； Fluctuations in fuel gas pressure ； Moisture in raw material strip ；