Design of high-pressure water injection volume for hydrorefining units
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To prevent ammonium salt crystallization in high-pressure heat exchangers, hydrogenation units generally supply softened water before and after such heat exchangers. How is the location for supplying this water typically designed? What is the general amount of water used per unit of processing volume?
Generally, several water injection points can be installed before the heat exchanger passes to the high-pressure air cooler, with the amount of water injected being around 5% of the processing volume. In actual operation, consider product quality and the level of the high-cut point, as well as the reactor pressure difference, and adjust operations accordingly
Generally, water is injected in two places: one before the high-pressure air cooler, and the other before the last inlet/outlet material heat exchanger at the reactor outlet. As mentioned on the second floor, the amount of water injected is approximately 5%. In the design of plants, water is injected at these two locations; the specific location depends on the conditions of each individual plant
Usually, water is injected in two places: one before the high-pressure air cooler, and the other before the last inlet/outlet material heat exchanger at the reactor outlet. The amount of water injected is around 5%, and its main purpose is to prevent salt buildup in the high-pressure air cooler, which could lead to pipe blockages, increased pressure drops, and reduced cooling efficiency.
Our 260w diesel hydrogenation system injects water before air cooling, at a rate of 10-20 t/h. During design, there was also a water injection point at the hot high-pressure gas outlet, but it has never been used.
To prevent ammonium salt crystallization in the high-pressure heat exchanger, softened water is injected between the high-pressure heat exchanger and before air cooling; the typical location for injection is at the welded junctions in a T-shaped design. The water injection amount is generally 5% of the processing volume.
The water injection volume is generally 6%-15% of the processing volume, I guess
Hydrorefining generally uses one water injection point, with the water addition amount being around 5-10%; for units with a lower processing capacity, this percentage is higher, at around 8-10%
This post was last edited by akzo2008 on 2010-5-26 at 11:15. The amount of water added is generally related to the N content of the raw materials; it usually accounts for 4%-15% of the processing volume. There are typically two points where water is added – soft water is injected between the high-pressure heat exchanger and before air cooling. The location where water is added is usually at the welded junctions designed in a T-shape. In some device designs, water is also injected into the hot high-pressure overhead gas. For devices with a low processing capacity, the water injection ratio is higher
Regarding the location of the water injection point, it is mainly determined by the point where the ammonium salts begin to deposit; this is related to the heat exchange temperature and operating pressure. In our case, the injection takes place before the last heat exchanger! I personally think this should also be related to the operating conditions of each device!
It is around 5~10% of the device’s processing capacity, but this amount needs to be adjusted according to specific circumstances. It mainly involves adjusting the location of the water injection points.