Operations when reducing the workforce in the compressor section

Turn off a few compressors, okay?:lol :lol

The flow regulation of reciprocating compressors is achieved through circuit control; therefore, any reduction in flow caused by issues in the preceding or subsequent processes is accomplished by opening the circuit valves to allow a portion of the gas to return to the compressor inlet, thereby achieving the desired reduction.

Reducing the previous working pressure will result in insufficient compressor output; when the subsequent working pressure is reduced, the compressor must have its circulation valve (return valve) opened to operate under reduced load.

I think the reduction caused by the previous stage is a deliberate fine-tuning, whereas that caused by the subsequent stage is often sudden. In ammonia synthesis production, the interconnections are such that changing one aspect can have an impact on the whole system. Hard work, guys! ! ! ! ! !

Reducing the previous serial number will result in insufficient compressor output

The reduction in the previous process is achieved through adjustment of the \"return valve\" to maintain the inlet flow rate. However, if the load on the preceding process is reduced over a long period, the number of compressors in use should be decreased.

In the case of a temporary reduction in capacity due to issues with the previous stage, it is generally necessary to open the circuit valve located closest to that stage. However, it is important to maintain balance in the pressures across all stages of the compressor; sometimes, if the pressure in the intermediate stages is too low, it is possible to open the terminal circuit valve. Of course, if the capacity reduction lasts for too long, then considering reducing the capacity of the compressor itself becomes necessary. To reduce failures in the subsequent section, it is necessary to take into account the system pressure and the capacity of the preceding section. When the system pressure is low or there is sufficient storage capacity in the preceding section (for example, when the height of the gas holder is low), it is possible to open the bypass valve; otherwise, the only option is to open the relief valve, in order to prevent overpressure in the preceding section or the collapse of the gas holder. This post was last edited by chen3jun on 2009-4-5 16:10]

When reducing the flow rate, an open-loop valve is generally used (two circuits per one).

Our compressors feature two-cylinder, three-stage compression; during pressure reduction, the three-way valve is usually opened, while the one-way valve is rarely used, and there is no two-way valve

What about a centrifugal compressor? Should one first open the valve for venting to reduce pressure, and then lower the speed? The anti-surge system is used to circulate the gas. I would like to ask whether it’s possible to make the syngas compressor operate in circulation mode, without sending any gas outside

There is a principle regarding the acceleration and pressure increase, as well as deceleration and pressure decrease in centrifugal compressors: \"Increase the speed first when raising the pressure, and reduce the speed first when lowering the pressure.\"”； The syngas compressor can run in a closed loop without delivering gas to the outside.

The general adjustment methods for reciprocating compressors are basically the same. The difference lies in the number of cylinders and stages; our factory uses Siemens four-cylinder, three-stage reciprocating compressors. It is equipped with three-way and one-way, two-way and one-way regulating valves. The inlet and outlet relief valves are used to adjust the balance of pressures at the inlet and outlet, that is, to achieve pressure balance in the system. This method is used for adjustment in both the front and rear sections. Reducing the volume in the upstream section means lowering the inlet pressure of the gas entering the compressor; by using a 3-to-1 or 1-to-1 ratio, the outlet pressure is adjusted to ensure normal operation of the upstream section and maintain pressure balance within the system. In the latter section, reduced application of three-stage venting and three-return-one-regulation can be used, or reduction can be achieved in the preceding section. Reduce the number of compressors. Adjusting the compression ratio is also an important means to ensure the smooth operation of reciprocating compressors.