I would like to know the factors to consider when choosing hydrogen mixing before the furnace, hydrogen mixing after the furnace, or oil mixing after the furnace
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The last edit to this post was made by keflybird on 2019-6-10 00:00, who stated that there are three ways in which the two important raw materials for hydrogenation units can be combined. 1. The oil is mixed with hydrogen in front of the furnace, and then heated through the furnace tubes – let’s call this process “hydrogen mixing in front of the furnace” for now” ； 2. The oil is heated in the furnace tubes, and hydrogen is mixed in after the furnace – let’s call this \"hydrogen mixed after the furnace\" for now” ； 3. Hydrogen is heated through the furnace tubes, while oil is heated via the feedstock/reactant heat exchanger; the oils are mixed after the furnace – let’s call this \"mixing after the furnace\" for now” ； 1 and 2 seem quite easy to understand, but what about 3? Could you share some experience? Recently, this topic has been discussed for a long time, and many people believe that 3 refers to \"hydrogen mixing behind the furnace\". . . Seeking discussion.
Personal understanding: Mixing in front of the furnace, with hydrogen and oil entering the same heating furnace； Mixing after the furnace: hydrogen and oil do not enter the same heating furnace.
I support the view for the second floor: it should be divided into mixing in front of the furnace and mixing behind the furnace, without further distinguishing between mixing hydrogen or mixing oil. This is easier to understand. My personal understanding is that, at the operational level, when considering what’s in front of and behind the furnace, it mainly involves factors such as the material requirements for the furnace tubes, the load requirements of the heating furnace, the rationality of the process flow, and the convenience of operation.
This seems to be a good idea as well.