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Biogas Solution

Advanced Pressure Swing Adsorption (PSA) Technology for High-Purity Biogas Refining

Overview


Daigas Group's Pressure Swing Adsorption (PSA) unit effectively increases the methane concentration in biogas (including digester gas). These facilities leverage our extensive experience and technical expertise in gas refining technologies.

What DGPS can do


DGPS offers optimal solutions for effective biogas utilization and high-purity methane requirements, helping you optimize your biogas as a valuable resource.

Features


This system demonstrates an efficient method to convert biogas into a valuable, clean energy source.


Key Benefits:


  • Increases methane concentrations.
  • Removes hydrogen sulfide and siloxane from biogas.
  • Offers 3-4 times the storage density of conventional solutions at equivalent storage pressures utilizing porous adsorbent.

This diagram showcases a comprehensive biogas adsorption storage system.Biogas Sources: Biomass, sewage sludge, livestock manure, and food residues are fermented to produce raw biogas.Purification Process: The system includes a desulfurization tower, siloxane remover, and dehumidifier to remove impurities.Storage Tanks: Refined methane is stored in adsorbed biogas storage tanks at low pressure.Siloxane Removal: Siloxane impurities, which damage engines, are removed during storage.Usage:Refueling Stations: Biogas can be used for biogas-fueled vehicles.Power Generation: Used in cogeneration systems.Compact Hydrogen Generators: Converts biogas to hydrogen.Vehicle Transfer: Low-pressure transfer systems deliver the biogas to end-users.

Effective use


Biogas Power Generation System (Cogeneration System)


The biogas power generation system, also known as a cogeneration system, is designed to efficiently produce both electricity and heat from biogas. The process begins with biogas being introduced into a gas engine, which converts it into mechanical energy. This mechanical energy is then transformed into electricity through a generator. To enhance overall energy efficiency, a turbocharger compresses intake air, improving combustion performance. Additionally, the system captures the heat generated during combustion and cooling through heat exchangers. This recovered heat is used to supply hot water and steam, making the system ideal for industries requiring thermal energy. Furthermore, an exhaust gas treatment system with a denitration catalyst helps reduce nitrogen oxide (NOx) emissions, ensuring compliance with environmental regulations. This setup exemplifies how biogas cogeneration systems can simultaneously achieve energy efficiency and environmental sustainability.

Biogas automobile refueling station


A biogas automobile refueling station plays a critical role in sustainable transportation by supplying compressed biogas as a clean alternative to fossil fuels. The biogas is first purified and then compressed using a compressor unit, ensuring it reaches the necessary pressure levels for refueling vehicles. The gas storage unit securely holds the compressed biogas, while a dispenser unit facilitates quick and efficient vehicle refueling. The system offers both overhead and fixed refueling options for flexibility. To enhance safety, propane injection adds a detectable odor to the gas, aiding in leak detection and improving heat control during compression. This setup supports the adoption of renewable energy for vehicles, promoting a greener transportation future.

Biogas automobile refueling station


The biogas hydrogen refueling station is a cutting-edge system that converts biogas into high-purity hydrogen for use in hydrogen vehicles, fuel cells, and industrial applications. The process starts with steam methane reforming, where methane from biogas reacts with water to produce hydrogen and carbon monoxide. This mixture undergoes a CO shift process, which converts carbon monoxide to carbon dioxide while generating additional hydrogen. The hydrogen is then purified to a 99.999% purity level using a Hydrogen PSA (Pressure Swing Adsorption) process. This pure hydrogen can be used in various applications, including hydrogen-powered vehicles, fuel cells, and even as feedstock for producing second-generation biofuels. By leveraging biogas as a renewable hydrogen source, this system promotes the transition to a low-carbon, hydrogen-based economy.

Biogas Storage Tank


This chart compares different natural gas storage methods:Liquefied Natural Gas (LNG): Stores the largest amount of gas per unit volume at extremely low temperatures.Adsorbed Natural Gas (ANG): Provides better gas storage capacity at lower pressures (up to ~3 MPa) compared to Compressed Natural Gas (CNG).Compressed Natural Gas (CNG): Storage capacity increases linearly with pressure but doesn’t reach the efficiency of ANG or LNG. The pink zone indicates where ANG is more effective than CNG, while the yellow zone shows conditions where neither ANG nor CNG offer any further storage benefits.
The key benefits of adsorbed gas storage is to save tank space.1/20th of low-pressure storage and 1/4th of compression-based storage. This highlights adsorption storage’s efficiency in reducing tank size and overall storage costs.

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