The electronic governor adopts a multi-parameter closed-loop control mode, which uses the rotational speed, ultra-high pressure inlet pressure, extraction pressure, and compressor inlet pressure as external feedback signals to adjust the unit speed, thus controlling the speed. At the same time, the steam pressure level is effectively and reasonably distributed and the steam pipe network of the plant is balanced, and the output of the process medium at each outlet pressure is ensured. Application of electronic governor in ethylene cracking gas compressors. During normal operation, after 61.55t/h of ultra-high pressure steam is used for work, 21.719t/h of high-pressure steam is drawn to the high-pressure user; the other part is returned to the high-pressure section through the external pipe network to continue work. After 42.436t/h of high-pressure steam work, 38t/h medium-pressure steam is pumped to the medium-pressure user; the other part enters the low-pressure section to continue work.

Here, the ultra-high pressure valve mainly controls the inlet pressure of the ultra-high pressure steam to ensure that the ultra-high pressure steam is sufficient for entropy, the high-pressure steam valve controls the rotation speed of the compressor, and the low-pressure steam valve controls the medium-pressure extraction amount. If the speed, ultra-high pressure steam inlet pressure, and extraction pressure can be adjusted separately and remain stable, the speed control system must have the following conditions. When the inlet pressure of the ultra-high pressure steam increases, and the process load and the medium-pressure extraction pressure remain unchanged, the ultra-high pressure steam valve is opened, and the high-pressure and low-pressure steam valves are simultaneously closed. Conversely, the adjustment process is reversed. When the process load increases and the super-high pressure steam inlet pressure and the medium-pressure extraction pressure remain unchanged, the valve position of the ultra-high pressure steam valve remains unchanged, and the high-pressure and low-pressure steam valves are simultaneously opened. Conversely, the adjustment process is reversed. When the extraction pressure is increased, and the process load and the super-high pressure steam inlet pressure are constant, the ultra-high pressure steam valve position remains unchanged, the low-pressure steam valve position is to be closed, and the high-pressure steam valve position is to be opened. Conversely, the adjustment process is reversed.