Factors affecting the amount of circulating hydrogen

There are many factors that can have an impact, such as changes in the output of the hydrogen circulator itself, changes in the pressure of the reactor system, variations in the purity of the circulating hydrogen, increases in the system pressure difference, and fluctuations in the reaction depth; each specific issue needs to be analyzed on its own.

Circulator displacement, purified hydrogen purity, system pressure, cold hydrogen valve opening degree

The processing volume increases while the amount of recycled hydrogen decreases； The amount of light components in the feed increases, while the volume of recycled hydrogen decreases ； The reaction depth increases, and the amount of recycled hydrogen grows. This is my personal understanding; feel free to discuss it together.

It’s really hard for me to discuss this issue; I’ve always been a bit confused about circulators. From the perspective of the entire system, which part can be considered the inlet of the circulation machine, and which part is the outlet? For example, high pressure generally corresponds to the inlet section of the circulation machine, but from the perspective of the entire system, it can also be considered the outlet of the circulation machine. If the pressure due to high flow rates increases and is considered as the outlet pressure, then when the outlet pressure of the circulation pump rises, does that mean the circulation volume of the pump decreases? Because it’s equivalent to increasing the export resistance, right? But if it is considered as an inlet, then as the inlet pressure of the circulator increases, it is inevitable that the outlet pressure of the circulator will also increase, resulting in an increased flow rate. I understand it to be the case that there must be some error, but I can’t figure out where it is. I hope those who are more knowledgeable can give me some guidance!

The allowable differential pressure for the equipment is primarily influenced by the inlet pressure and molecular weight

System pressure, pressure drop, hydrogen purity

Cyclic hydrogen molecular weight, compressor speed,

I have been studying hydrogenation processes for a few years now, and my first impression is that the main role of recycled hydrogen is to remove the heat generated by the reaction. Analyze each case on a case-by-case basis. 1. Reaction depth: If the raw material has a high sulfur content, it is necessary to increase the reaction depth and reduce the space velocity. 2. Reaction temperature: If the temperature of the raw materials rises significantly, the circulation rate should be increased to protect the catalyst and improve yield. 3. Raw material components: For components with low density, the circulation rate should be appropriately reduced to protect the hydrogen circulation machine. Wait, the magnitude of the circulation volume is closely related to the properties of the feed material fed into the device. In my opinion, it plays a crucial role in ensuring the smooth operation of the entire device, as well as in determining product quality, yield, and economic efficiency.

Compression volume of the recycle hydrogen compressor, reactor system pressure, purity of recycle hydrogen, increase in system pressure difference, degree of reaction, properties of raw materials, processing volume, amount of light gasoline separated, etc

Firstly, the operating regulations will specify a hydrogen-to-oil ratio for you； In actual production, I rarely see adjustments to the flow rate of recycled hydrogen; instead, the purity of the recycled hydrogen is adjusted as appropriate based on the properties of the raw materials and the requirements for product quality. If we are only talking about the influencing factors, they would probably be the requirements of the production process, the speed of the booster pump, the space velocity of the feed, the properties of the raw materials, and the requirements regarding product quality!