Self-protection for hydrocracking cycle hydrogen compressor?

What do you mean by self-protection? Could it be explained in simpler terms to help everyone analyze it? If there is liquid present, it will definitely have an impact on the cylinders and other materials exposed to flow!

I’m not quite sure what you mean by “protecting yourself.” I work in a hydrocracking unit; the recycle hydrogen compressor here is of the centrifugal type (normally, reciprocating compressors are rarely used for recycle hydrogen). On my end, there is a process interlock in the liquid separation tank at the inlet of the cycle hydrogen compressor that monitors the liquid level; when the level exceeds 63%, it causes the cycle hydrogen compressor to shut down due to the interlock. The interlocks of the compressor itself do not cover issues related to liquid presence; they are all standard interlocks related to lubricating oil and similar substances. I’m not sure if by self-protection you mean interlocked shutdown.

Under what conditions does the hydrocracking cycle hydrogen compressor engage in self-protection? ⒈For self-protection, it must be put into use first. ⒉If the self-protection project exceeds the standard, it will trigger a chain reaction. For different machines, the self-protection items vary, and there are too many of them to list them all for you. If liquid is present in the hydrogen flowing into the inlet of the hydrocracking cycle hydrogen compressor, it can trigger the compressor’s safety protection system. So what is the acceptable level of liquid presence? Is there any standard for this? There is a standard, which is to set the value indicating the high level of the liquid in the liquid separation tank in front of the machine.

Centrifugal compressors are equipped with interlock devices for low oil pressure, excessive vibration levels, large displacement, and abnormal oil tank levels. It also depends on the specific use and driving device. If it’s a turbine, even more so. If there is a dry gas seal device, there are even more.

1. Hydrogenation plant cycle hydrogen compressors generally use centrifugal compressors driven by steam turbines. 2. The protection measures for centrifugal compressors consist of three main categories: 2.1. Protections necessary to safeguard the hardware itself, such as vibration and displacement of the compressor and steam turbine (or motor), bearing temperature, overspeed, lubrication conditions, stator temperature, electrical control overload, and electrical phase protection, among others. 2.2. Protections aimed at ensuring the safety of the compressor system, such as seal leaks, presence of liquid in the system, and excessively high temperatures of the output medium. 2.3. Interlocks related to the compressor system due to process requirements, such as emergency pressure relief, manual shutdown, or emergency stops required in cases that pose a safety threat. 3 For high-speed centrifugal compressors, the presence of liquid in the medium poses a significant threat to the hardware, as it can lead to overload and vibration that result in catastrophic damage to the rotating components; therefore, the presence of liquid is considered one of the factors that trigger compressor shutdown for protection purposes. Since the degree of liquid carryover is itself related to the temperature of the inlet liquid separation tank, the gas flow rate, and the vertical settling height, it must be determined based on the specific conditions. This post was last edited by lupg on 2009-3-20 21:33]

By self-protection, I mean the compressor’s interlocked shutdown!

1. The unit has many inherent interlock conditions; as long as the process requirements are met, self-protection will be ensured. 2. Liquid presence is common; it is necessary to drain the condensate promptly, and there is a two-out-of-three interlock for the liquid level. Generally, the liquid level interlock value can be changed; typically to 50%, at which point the actual liquid level in the container is half, meaning the container is only usable to a certain extent.