Lirun Technology has developed a large-scale hydrogen purification system designed for both electrolysis-based hydrogen production and various hydrogen-rich industrial off-gases (e.g., ammonia purge gas, methanol cracking gas). The system integrates multi-stage purification processes, including catalytic deoxidation, chemical adsorption dechlorination, and molecular sieve desulfurization as pretreatment units, combined with Temperature Swing Adsorption (TSA) and Pressure Swing Adsorption (PSA) as the core technologies. This ensures deep purification of hydrogen. The process adopts a closed-loop design. It is scalable to handle industrial production demands of several thousand Nm³/h, providing a source of high-purity hydrogen for fuel cells, electronics, and other applications.