Damage caused by undesired components in biogas

During biogas generation, besides energy-rich methane some other gases are built, whose properties affect plant operators adversely. Hydrogen sulphide turned out to be the most harmful. In contact with air and water, different sulphur compounds come up which lead to corrosion of all metallic parts. Thus, during plant shutdown, the unfavourable combination of humidity and hydrogen sulphide in the biogas causes strong corrosion to inside metallic engine components such as cylinder liners or pistons. Fresh engine oil can act as a buffer. However, the oil change interval will be shortened significantly as the neutralizing effect of the oil is rapidly compensated.

This might cause shorter maintenance intervals, relied with higher costs. At worst, the machinery can break. Damage will not only be caused in the combustion chamber but also in the exhaust gas system. Due to the burning process, corrosive acids will be generated, damaging the exhaust gas heat exchanger. In this part as well as in the catalyser, deposits come up having congestive effects and therefore cause higher costs and longer downtimes. By burning biogas, formaldehyde is generated in the exhaust gas, exceeding permanently the value of 40 mg/m³. Therefore, the so-called formaldehyde bonus of 1 ct/kWh cannot be claimed.

Our combined solutions

We offer to all plant operators an integrated and customised solution in order to face the “sulphur-problem”. The core of our solution is an activated carbon filter, built as twin chamber system. The two chambers are filled with activated carbon and flown through by gas. The first chamber has to clean up the gas completely, the following chamber is made for security reasons. It will only be used if the carbon in the first cleaner is completely filled up and harmful substances are released (desorption) instead of being absorbed (absorption) .

The dimension of the filter system depends on different parameters such as the quantity of H 2S in raw gas, gas flow, desired degree of cleaning, selected carbon lifetime, product form of activated carbon, temperature etc. The filters can be manufactured in HDPE as well as in stainless steel.

To achieve best cleaning efficiency, gas must be as dry as possible before entering the filter chamber. The separation of humidity from the gas is achieved by cooling gas down to its dew point. As carbon is getting its best degree of efficiency at temperatures over 20 °C, the gas must be rewarmed after cooling. This will be effected by a downstream gas warming system.

After plant design and construction, we will install all components turnkey on your site, will operate them and perform routine maintenance steps as well as examination of filling and exchange of activated carbon.

We would be glad to provide you with an offer. Please do not hesitate to contact us!

Further technical services

In addition to combined solutions against hydrogen sulphide, we offer further services such as :

• Cleaning of exhau st gas heat exchangers to remove deposits and to ensure optimal operation
• Service to the entire gas technology from blower over gas engines to the exhaust gas system: maintenance and troubleshooting service, repairs and overhauls.
• Conversion and replacement of exhaust gas catalysers.

Consulting and plant management

In addition to the already presented solutions, we also take over tasks in the field of plant management such as technical plant management, coordination of different service providers, observation of maintenance schedules and troubleshooting management. We also keep contact to authorities and observe all requirements, laws etc. for you.

Furthermore, we offer qualified and reliable assistance on all matters of your biogas plant.

Your advantages

• Plant safety of all technical components
• Reduction of downtimes
• Optimisation of plant components
• Improvement of economic efficiency by additional technology bonus if formaldehyde emissions fall permanently below 40 mg/m³ (1ct/kWh)
• Decomposition of hydrogen sulphide down to detection limit
• Observation of limit values of combustion gases as requested by engine manufacturers. Therefore, manufacturer warranty can be kept.
• Prevention from wear and tear due to sulphur, increase of oil life time
• Focus on your daily business by outsourcing of various tasks.

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