Regarding the location of the hydrogenation water injection point?
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This post was last edited by liuquan1100 on 2017-1-8 15:57. Some of the water injection points of the hydrogenation unit are set on the high-pressure air-cooling main pipe, and some are set on the high-pressure air-cooling branches (each air-cooling branch). Please discuss which one is better, and what are the advantages and disadvantages of each? This post was last edited by grjq on 2009-4-15 17:08 ]
After the hydrogenation comes out of the reactor and passes through the heat exchanger, it usually enters high-pressure air cooling, so the concepts of headers and branches are not understood. But if you look at it from the other hand, the separation part has the difference between hot high score and cold high score. There is only one way to get a good score, so there is only the manager ； There are two branches for the hot high-pressure unit, and the high-pressure air cooling is after the hot high-end unit. In this way, there are two air-cooling units. Relatively speaking, adding branches like this can appropriately reduce the amount of water injected from the hot low-end unit to the cold low unit.
According to the poster, after looking at the icon made by the poster, ours is added to the bus. In fact, it is enough to add it to the bus. The water volume is too finely divided and it is difficult to adjust the water volume. Inadequate water volume adjustment directly leads to the effect of ammonium salt flushing.
It should be better on the main pipe. There are too many branches and the quantity is difficult to control. If branches are used, several water lines will be needed.
It can be added to the bus, because it is a high-pressure pipeline and an extra weld will increase the risk.
I think it is more appropriate to add it to the main pipe, which can reduce welding points, but there is also a distribution problem, because the flow rate into the air cooling is also one of the factors affecting corrosion. It can be avoided if it can be avoided during design and operation.
It is better to use it on the main pipe. Too many branch lines will cause uneven water injection.
I think it should be on the bus line, so that it can be fully mixed~ We also focus on the bus line,
On the bus, if high-pressure air cooling does not have valve control, is it easy to cause bias flow?
According to the situation shown in the figure, it is better for the water injection point to be on the bus.
It is good on the bus, easy to mix evenly, and also improves the safety of the branch lines.
In the past, it was added to the main pipe, but now some devices are injected separately. Water points are added to each channel for more even distribution, and a flow-limiting orifice plate is generally used to control the flow of each channel to be consistent. Another advantage of water injection in each channel is that when you find out which piece of air cooling has ammonium salt crystallization problem, you can open its restricting orifice plate or close other channels to inject a large amount of water to wash the salt. Personal opinions are for reference only
We have changed the design of a set of equipment several times, and there are different opinions on which one is better. It was first designed in the main pipe. A year later, the air cooling leaked, so the design was changed to a branch, and water was injected into line 4. A year later, it leaked again, and the design was changed back to the main pipe.
I agree with the point on the 14th floor. If you add water injection points to each branch and keep the water volume constant, the effect will be better than that of the main pipe.
Our company's hydrogenation capacity is 600,000 tons/year. Our water injection position is on the main pipe and is divided into three channels.
Our new installations are all managed by the general manager, and this is the first time I have heard of branch management. I feel that the main pipe has more advantages, the quantity is easy to control, and the risk is reduced due to fewer welding beads.
I think it should be injected into the main pipe, and the desalted water is boosted by the pump and flows through the restriction orifice plate, regulating valve, one-way valve, and stop valve. Compared with the injection in the branch road, it is considered from the material cost and production safety. Main pipe injection is better. After considering the production of ammonium salts at low temperatures during start-up, a water injection point should be set up at another point.
The fewer high-pressure pipelines, the better. From a safety point of view, haha. Personally, I think it is fine on the bus. As long as the water injection volume and temperature meet the requirements, there will generally be no drift. On the other hand, the components of sulfur and ammonia in each air cooling are also different, but as long as they are even and consistent, there is no need to divide them very finely.