Against the backdrop of the green and low-carbon transformation of the chemical industry, hydrogen compressor stations must ensure a stable gas supply while reducing energy consumption. Sichuan Jiuhe Chemical Industrial Co., Ltd. upgraded three 110 kW reciprocating piston hydrogen compressors at its station. By adopting FR500A vector drives, the project achieved constant-pressure hydrogen supply and coordinated control of the compressor units, ensured safe and stable hydrogen-compression operation, and effectively reduced energy consumption, providing a replicable reference solution for similar hydrogen compressor station retrofits in the chemical industry.
The reciprocating piston hydrogen-compressor system mainly consists of the piston compressor unit, drive motor, pressure-sensing assembly, suction and discharge valve assemblies, cooling piping, and gas-storage buffer unit. The piston's reciprocating motion compresses and boosts the hydrogen pressure. Supporting sensors collect pipeline-network pressure data in real time and can be integrated with speed control to maintain stable supply pressure, meeting the operating requirements for continuous hydrogen delivery in chemical-industry applications.
The reciprocating piston hydrogen compressor uses a crank-and-connecting-rod mechanism to drive the piston back and forth within the cylinder. Hydrogen is drawn in through the suction valve; as the piston compresses the gas, its pressure rises, and the discharge valve opens to deliver the gas once the set pressure is reached. Supporting pressure sensors monitor pipeline-network pressure in real time. Combined with speed control, they regulate gas output and continuously provide stable, high-pressure hydrogen for chemical processes, meeting continuous-supply requirements.
The FR500A drive serves as the intelligent control center of the hydrogen compressor station. It dynamically adjusts motor speed according to pipeline-network pressure, precisely matches hydrogen demand, stabilizes supply pressure, and reduces losses from hydrogen venting. It also enables coordinated control of multiple compressors and allocates unit loads as required.
For reciprocating piston hydrogen compressors, the drive replaces conventional unload control and automatically adjusts speed in response to gas demand, substantially reducing energy consumption during unloaded operation. Its soft-start function reduces mechanical shock, extends unit service life, lowers operation and maintenance costs, and delivers both safe gas supply and energy-saving benefits.
In this project, the FR500A drives were deeply integrated with the compressor-station PLC system to achieve coordinated control of three piston hydrogen-compressor units. The system can automatically match optimum operating parameters to on-site hydrogen-demand conditions in the chemical plant. After the retrofit, compressor-unit energy consumption decreased by 20% to 40%, while gas-supply system operating efficiency increased by more than 15%.
At the same time, speed-based pressure stabilization reduces hydrogen venting and unloaded-operation losses, ensures a stable and safe hydrogen supply, and simultaneously supports energy conservation and safe production, providing a practical and reliable solution for the green retrofit of chemical-industry hydrogen compressor stations.
