Abstract
Objectives: This study aims to assess the performance of a Pressure Swing Adsorption (PSA) unit in removing the carbon dioxide from biogas by evaluating the breakthrough and adsorption capacity of the adsorption process as well as determining the effects of cyclic regeneration of the adsorbent. Methods: The PSA system was developed in order to establish the behavior of different gas separation experiments. It can be operated up to 10 bars pressure at ambient temperatures and gas flow rate from 0 to 15 L min-1. It is composed only of one main vessel made up of 316 stainless steel components. Use of physical adsorbent (Zeolite 13X) in a Pressure Swing Adsorption (PSA) system will consume the gaseous impurities such as CO2 . Product gas was collected into 1 L Tedlar bags and analyzed using SRI gas chromatograph with TCD and HID detector to validate the CO2 and CH4 composition. Findings: The results of the Pressure Swing Adsorption (PSA) experiments showed an average increase of 160% in the net heating value over that of a certified gas standard. The amount of methane was also significantly higher although the amount of the other gasses (i.e. nitrogen) remained comparatively the same. The number of other gases was significantly lower and no trace of carbon dioxide was observed in the PSA product gas indicating that carbon dioxide had been completely absorbed by the system. Application: This study helps to reduce CO2 emitted to the atmosphere from the anaerobic co-digestion of biogas to produce high energy content bio-methane fuel. Keywords: Adsorption, Biogas, Carbon Dioxide, Methane Gas, Pressure Swing Adsorption, Zeolite 13X
Highlights
Biogas is a renewable, high-quality fuel which can be produced from various organic raw materials and used for various energy services
In order to overcome the problem in increasing the methane recovery from upgrading, this study aims to Assess the performance of a Pressure Swing Adsorption (PSA) unit in removing the carbon dioxide from biogas by evaluating the breakthrough and adsorption capacity of the adsorption process as well as determining the effects of cyclic regeneration of the adsorbent from the anaerobic co-digestion of agricultural biomass waste utilizing dairy manure co-digested with various biomass feedstock’s for power generation applications
The use of the PSA system presents a feasible application to producing a cleaner biogas and reducing the problems in downstream operations
Summary
High-quality fuel which can be produced from various organic raw materials and used for various energy services. Biogas technology has been developed and widely used over the world because it has several advantages – the reduction of the dependence on non-renewable resources, high energy-efficiency, environmental benefits, available and cheap resources to feedstock, relatively easy and cheap technology for pro-. Biogas as a renewable source of energy is becoming increasingly important since biogas has some ecological advantages mainly being CO2 neutral; it reduces the formation of greenhouse gases. Biogas represents a meaningful way of both waste use and waste disposal as agricultural, commercial and municipal waste from biogenic sources used for the production of different types of biogas. The main components of biogas are methane (CH4) and Carbon Dioxide (CO2); it contains significant quantities of undesirable compounds. The other components are mostly useless for the energy production such as nitrogen or water.
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