Biogas Purification

To meet biogas quality standards—often arising from the Technical and Operating Documentation (DTR) of CHP units regarding the qualitative composition of fuels—and to increase their efficiency, biogas purification is necessary. In our Laboratory we not only carry out comprehensive testing of gaseous fuel composition. We also offer equipment, technologies, and supplements used to improve the quality and efficiency of biofuels.

Biogas has a very complex organic matrix, where, in addition to organic hydrocarbons, hydrogen sulfide is present in very large quantities. Due to its chemical nature, it is hazardous to human and animal health and has a negative impact on the operation of CHP units. Moreover, in a humid environment, when combined with water, it forms a weak acid (weak in terms of chemical acid classification—related to the dissociation constant—but strong and destructive in its effects), H2Saq, which contributes to the corrosion of internal instrumentation parts and equipment used in biogas power plants. To limit the negative impact of hydrogen sulfide, desulfurization processes are carried out—based on adsorption phenomena, e.g. on an iron-based bed (as a chemical purification option), impregnated activated carbon, absorption (using water scrubbers, often with alkaline NaOH), and biological processes involving microorganisms (bacteria) in a countercurrent flow.

Reducing the concentration of hydrogen sulfide in biogas generates savings by maintaining regular maintenance intervals and reducing above-average equipment repairs. Purifying biogas to a quality compliant with the DTR allows it to be used safely and directly as an energy carrier, e.g. in CHP units. Emission testing is extremely important, as monitoring it allows emission parameters to be maintained and the type and quantity of substances generated during combustion to be determined. This is a conscious action in the field of environmental protection in the process of utilizing renewable energy sources (RES).

Advantages of Biogas Purification

Biogas purification is carried out to obtain a clean and safe fuel. The main advantages of this process are:

• improved fuel quality – biogas purification eliminates harmful and undesirable contaminants such as hydrogen sulfide (H2S), ammonia (NH3), hydrogen chloride (HCl), or carbon dioxide (CO2), resulting in a higher-quality, more environmentally friendly fuel,
• increased performance and efficiency – removing unwanted contaminants improves the performance and efficiency of the biogas production process. Cleaner biogas has a higher energy value and can be used for various purposes, such as generating electricity or heat,
• environmental protection – removing contaminants from biogas helps reduce emissions of harmful substances into the atmosphere, which has a positive effect on air quality and reduces the negative impact on the environment,
• workplace safety – biogas purification allows for the removal of toxic and explosive gases, increasing workplace safety,
• increased market value – cleaner biogas has a higher market value and can be sold at a higher price, contributing to increased profits from fuel production,
• reduced energy consumption – some biogas purification processes can be energy-intensive, but at the same time they supply energy that can be used within the production facility. Such a solution leads to reduced consumption of energy from external sources.

Methods of Biogas Purification

There are several methods of biogas purification, and they depend on the contaminants that need to be removed. The way in which the quality of this fuel is improved is determined primarily by its composition. It is on this basis that the method is chosen to be both effective and economically justified. The most popular methods of biogas purification include:

• drying – our offer includes high-efficiency dryers,
• adsorption – the dynamic deposition of contaminant particles on the porous surface of an adsorbent. We offer carbon filters based on impregnated and non-impregnated carbon adsorbents,
• the use of dust separators – in these filters we remove solid particulate compounds in the PM2.5 class. Organic compound condensation demisters – the operating principle is based on VOC condensation and is based on the dew point of organic compounds.

We invite you to contact us by phone or email. We will learn about your expectations, tell you about the terms of cooperation, and provide you with a preliminary quote.