Biogas can contain large quantities of poisonous hydrogen sulphide depending upon the fermentation process and which input materials are used. This gas can cause permanent damage to gas engines or other consumers of the biogas.

The majority of the hydrogen sulphide gas can be effectively removed by using an ennox active carbon filter ACF.

In addition, the active carbon filter can be used for the removal of damaging siloxane from the biogas, furthermore for the neutralization of unpleasant odours in outgoing air and tanks.

Our core business is the most up-to-date quality gas flare technology for a safe, efficient and environmentally friendly combustion of gases from landfill, bio and sewage gas systems.

Our fully automatic flare NOXmatic with its extensive range of accessories can be suited for every low and medium temperature combustion application. With various burner systems we can cover the complete spectrum of power requirements in single or multi-stage operation.

The NOXmatic flare is manufactured entirely from stainless steel and equipped with high quality components (i.e., ATEX certified flame arresters, DVGW certified automatic and manual valves…).

All control and monitoring functions are achieved with an individual programmable controller, which also governs the signal transfer with the main controller.

NOXmatic flares can be delivered worldwide with a capacity from 100kW to 20MW.

Modern and large biogas systems for biogas upgrading to natural gas quality is becoming more popular. Here the biogas is treated for the complete removal of all unwanted gaseous materials and fed into the gas network or alternatively used as fuel in vehicles.

Here the technical requirements of the gas flare become even more critical, as the flare is now not only to be suitable for use with pure biogas, but also must be compatible with biomethane with a methane content of > 95%.

This is no problem for our modern NOXmatic BM flare for biogas and biomethane. With flexible burner technology we can combust both materials safely, efficiently and with low emissions.

The broad range of accessories for the NOXmatic standard flare is also available to our customers. With this offering we are able to meet all the individual requirements of our customers and their applications.

Gas from bio or sewage processing systems are often contaminated with water vapour or very sparsely distributed small particulate matter, which, when used for example in CHP units can cause operating problems or even damage. For the fine cleaning of the gases before utilization an ennox ceramic fine filter is used.

In the ennox ceramic fine filter the fine particles contained in the gas are captured by a special fire-clay filter (Pantel). Condensate collects in the form of a moisture layer on the surface of the material and drips into the collector below.

An automatic discharge system with level indication can be installed in the base of the digester upon request.

Condensation from saturated biogas collects at the lowest points in the pipework, in bends etc. This can negatively influence the effective operation of biogas systems.

ennox condensate accumulator is installed at the lowest point in the pipework. The condensate gathers in the container where it can be discharged through a manual tap and/or an automatic siphon.

As an option ennox will supply a level indicator or an automatic discharger.

Bio or sewage gas is saturated with water vapour. Condensation can occur within the pipework systems of digester systems as a result of fluctuating temperatures. The ennox condensate pot allows for the collection and controlled discharge of any condensation water accumulations.

The gas flows through the condensate pot where it is channeled within the pot through a separation chamber. The reduction in gas flow velocity and the influence of temperature fluctuations cause the water vapour in the gas to condense and collect at the bottom of the pot.

The collected condensate can be discharged from the point of collection either with a siphon or an automatic discharger.

For temporary buffering due to fluctuations in gas production or inoperable production systems or consumers a storage of the produced biogas is required.
The holder is made up of two spherical shaped polymer membranes (other forms are also possible), lying one inside the other. The external membrane is maintained in a stable form with the use of an air blower. The external membrane then serves as protector for the inner membrane against the influence of environmental factors such as wind or snow.
The gas is stored within the inner membrane. The pressure generated by the blower is applied to the outside surface of the inner membrane, thus, maintaining the system pressure from the biogas reactor. The movement of the inner membrane during inflation and deflation is recorded either with a cabled sensor or radar. The information is then converted into a level indication signal and sent to a central control system.
The regulation of the supporting air resulting in the stability of the external membrane is controlled by a standard pressure maintaining valve. A special over pressure valve is responsible for the safety within the inner membrane.

During the pyrolysis process the biomass is split into its solid, fluid and gaseous components. The solid and fluid parts are used as combustibles. Thereby pyrolysis gas is formed which is a high-energy gas and can be used for different kind of applications. Gases with a similar composition are generated for example in the fuel industry.
The main difference between the “classical” biogas and the pyrolysis gas is the completely different composition, in most cases the high gas temperature and the pollution in the gas. This makes an alternative fitting technology as well as control system necessary.
The flares have to be in accordance with the technical requirements and with the demanded safety standards. Our team will assist you to find the right flare for your standard.

Under certain conditions foam can accumulate in the digester as a result of the fermentation process. If allowed to enter into the pipework, the foam can result in blockage, damage or impair the functionality of safety devices.

The gas dome integrated ennox foam trap utilizes a light curtain detection system, which reliably recognizes any build-up of foam and prevents the ingress of such foam into the pipework.

With the compact assembly directly on the gas dome, the detection and counter-measures are immediate, therefore requiring no installation of a return pipe system for the accumulated foam back into the digester.

As an option, the foam trap can be provided with a fully automatic controller as well as with mechanical over/under pressure safety valves.”

Biogas, sewage gas and landfill gas contains not only water vapour, but also a whole host of additional impurities such as hydrogen sulphide, NH3 and siloxane, which, when processed in the utilization system can not only lead to a reduction in efficiency, but also result in damage to the system.

The dehumidification of the gas before processing is a basic preliminary requirement in order to permit an efficient usage of the biogas and an investment in the sustainability of the utilization system.

With the ennox gas chill dryer the gas to be processed is passed through a heat exchanger where the cooled gas can expel any moisture which drips and is collected as condensate.
According to the technical requirements of the installation a post-warming or an economical and ecological energy recovery system can be implemented into the system.