Biomethane Upgrading System Using Pressure Swing Adsorption (PSA) Technology. The system is described systematically as follows:
- Biogas Pretreatment: Raw biogas undergoes pretreatment stages including dehydration, desulfurization, and dust removal to eliminate water vapor, hydrogen sulfide, and solid impurities, creating favorable conditions for subsequent purification.
- Core Purification (PSA): The pretreated biogas enters the PSA unit, which consists of multiple adsorption towers filled with specific adsorbents. Through periodic adsorption of impurities such as carbon dioxide under high pressure and desorption under low pressure, efficient separation of methane and carbon dioxide is achieved, resulting in a high concentration of methane gas.
- Post-treatment and Quality Control: The upgraded biomethane may undergo further fine dehydration treatment and is monitored for quality using online gas analyzers to ensure it meets natural gas usage standards.
- Compression and Metering: The standardized biomethane is compressed by a compressor to facilitate storage, transportation, or injection into the natural gas grid. The system is equipped with metering devices such as flow meters to monitor the biomethane production rate.
- Automation Control and Safety Assurance: The entire system is monitored and operated by an automated control system, including precise control of parameters such as pressure, temperature, and valve switching. It is also equipped with comprehensive safety protection devices to ensure stable and reliable system operation
