How are the pilot valve and anti-stall valve of the 3K engine unit controlled! !

Guidable page valve: also known as guide vanes, its main function is energy saving. Adjust the appropriate opening degree of the system’s load control valve. The higher the load, the greater the opening. The anti-surge valve is primarily a 3K valve designed to demonstrate its anti-surge function; under normal conditions, it acts as a backflow valve to stabilize the pressure at the compressor inlet. Due to the control logic settings of the control system, the minimum opening degree of the anti-surge valve is controlled by a program. When the control system detects signs of surge, this valve operates under the control of an internal program to protect the compressor.

I would like to ask everyone: for the guide vane valves in your factory, does the valve position ranging from 0 to 100 correspond to an angle of the guide vane of 90 degrees to 0 degrees, or 80 degrees to -20 degrees?

Our company’s range might be -20 to 80; I can’t remember exactly now

Dear colleague: Imported adjustable guide vanes are generally set to automatic control, which yields good results; however, it can be a bit difficult to make adjustments when the gas flow rate during startup and shutdown is insufficient； This requires experience ； This is especially noticeable when starting the car for the first time. In fact, there’s no need to rush; once the current level increases, things will gradually return to normal ； However, this is on the condition that the anti-surge valve starts to operate, causing it to gradually decrease from 99%. For reference only!

When driving the machine, manual mode is generally used with the opening set at 10%; as the air volume increases over time, once surge valves start to close, one gradually tries to switch to automatic control of the guide vane valves. This is the usual way we operate the machine, and no major issues have been observed

Colleagues on the 5th floor: Why hasn’t our anti-surge valve moved at all? It remains fully open! But we have just started driving, and the traffic volume is very low. What’s the reason for this? Our controller was supplied by the German side, and no control scheme was provided! ! !

For the one on the sixth floor, what is the processing capacity of your compressor, and what is its operating flow rate? If it’s not explained clearly, I can’t answer

Our designed maximum flow rate is 7500 M3/H, with a normal flow rate of 6500 M3/H, but currently we only have a flow rate of 1500 M3/H!

Regarding the issues with the guide vane valves and anti-surge valves, I’ll explain how we manage them. The unit is equipped with guide vanes and anti-surge valves; in our system, there is also a large reflux valve that directs the gas coming out of the compressor back to before the dryer, thereby controlling the pressure in the upstream system. Before starting up, the guide vanes are fully closed, the anti-surge valve is fully open, and the large reflux valve is also fully closed. After the compressor starts running, the anti-surge valve is gradually closed while the large reflux valve is opened wider, until the anti-surge valve is fully closed. At this point, the compressor becomes part of the system. Then, the load is increased to normal levels, and the inlet pressure is controlled using the guide vanes, with the large reflux valve being fully closed.

Then your unit’s surge value must be greater than 1500 Nm3/h; check what the flow rate is on the compressor anti-surge controller

But our anti-surge valve is controlled by a controller {provided by the German side}; our DCS cannot control it! Also, our export flow meter was provided by the German side, and it showed the full scale even after very little gas had passed through it! And the anti-surge valve stays fully open; it doesn’t move at all! !

Also, today the bearing temperature suddenly gave a high-level alarm, causing the system to shut down! How foolish!

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