Abstract
Biogas, which generated from renewable sources can be used as a sustainable energy to achieve resourceful targets of biofuel for internal combustion engines. This process can be achieved in combined absorption and adsorption chemical way. This method can be employed by aqueous solutions of calcium hydroxide, activated carbon, iron(II) chloride, silica gel and sodium sulfate respectively. The presence of CO 2 , H 2 S and H 2 O in the biogas has lowering the calorific value and detrimental corrosion effects on the metal components. Removal of these contaminants from the biogas can therefore significantly improve the gas quality. A comparison study was investigated using combined chemical methods of improving the calorific value of biogas. Experiment results revealed that the aqueous solution used effectively in reacting with CO 2 in biogas (over 85-90% removal efficiency), creating CH 4 enriched biogas. The removal efficiency was the highest in method 1, where efficiency results were 91.5%, 97.1% and 91.8%, for CO 2 , H 2 S, and H 2 O, respectively. The corresponding CH 4 enrichment was 97.5%. These results indicate that the method 1 is more suitable compare to method 2. However, both methane enrichment processes might be useful for cleaning and upgrading methane quality in biogas.
Highlights
World energy demand has continued to increase, but supplies are being dwindled
The enhancement technologies of biogas are generally performed two major steps: a cleaning process to remove the trace components which are harmful to the appliances and an upgrading process to adjust the calorific value and relative density in order to meet the standard specifications using as vehicle fuel or for injection in the natural gas grid [6]
The study was aimed at fabricating a biogas to optimize the calorific value as well as a cleaning system of biogas derived from solid wastes
Summary
World energy demand has continued to increase, but supplies are being dwindled. As can be seen, such biogas mainly contains methane; other combustible hydrocarbons of biogas do not devote much to the calorific value of gas. Methane enhancement technologies of biogas are obtainable through the development of an upgrading process that aimed it to be utilized effectively to remove contaminant gases. The enhancement technologies of biogas are generally performed two major steps: a cleaning process to remove the trace components which are harmful to the appliances and an upgrading process to adjust the calorific value and relative density in order to meet the standard specifications using as vehicle fuel or for injection in the natural gas grid [6]. CO2 be removed if the biogas is to be upgraded to standard natural gas or car fuel since CO2 reduces the energy content of biogas [10]. H2S-concentration of upgrading biogas below 100 ppm, which is well below the maximum concentration of H2S acceptable for running in internal combustion engines [13]
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