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Ingenieurbüro Buse GmbH in the field of biogas upgrading

In the field of biomethane, we operate as a plant constructing company. With our own company run pilot plant, Biogas is upgraded to Biomethane on a technical scale, using an internally delveloped process. We, Ingenieurbüro Buse GmbH, are offering the planung, assembly and the commisioning of such plants. We are appling for this process patent in the European Patent office since February 2012 in Den Haag (PCT reference number: PCT/EP2012/052956).

Aims of biogas upgrading

In recent years there has been an increased interest in biogas as a source of renewable energy. Commonly used for burning in block heat and power plants, mostly at the location where biogas is being produced. This process leads to a very high energy loss due to the fact that the energy produced exceeds the demand, this rings true in most rural areas. In order to reduce these losses it is necessary to increase the methane content in biogas thus upgrading it to biomethane, which can be used to inject into an already existing gas delivery network or CNG biofuel, as examples. However the upgrading or conditioning of raw biogas to biomethane produced by industrial or Agricultural plants, requires the removal of unwanted and harmful gases, such as carbon dioxide (CO2), Nitrogen (N2) and Hydrogen Sulphide (H2S), using the process of Ingenieurbuero Buse GmbH the methane concentration can reach a quality of 98%, widely exceeding all other processes.

State of development

Since November 2010 Ingenieurbüro Buse GmbH is running a pilot plant on technical scale where 10 Nm³/h of raw biogas is upgraded to biomethane in a continuous and fully automatic operation. The Plant is integrated into an existing biogas production unit and treating the biogas produced on site. The plant is used and examined to optimize the process and prepare the design of industrial scale projects. The commissioning of the first plant in an industrial scale is scheduled for autumn 2012.

The plant concept – Upgrading in two steps

Biogas upgrading is performed using a combination of two membrane contact processes. In both cases, the membrane applied has strictly hydrophobic properties. With micropores on the surface of the hollow fibers, it offers a large, gas permeable contact area. The driving force of the process is the partial pressure gradient of dissolved gases on both sides of the membrane.

Step 1: CO2 extraction with membrane contact process

Ingenieurbüro Buse GmbH in Winsen

Prefiltered water is pumped out of a recirculation tank by a centrifugal pump and treated in a gas exchange membrane contactor module, where dissolved gases are removed by a conventional membrane degasification process. Inside the hollow fibers a vacuum is applied by vacuum pumps. Under pressure conditions far below ambient pressure. Prefiltered ambient air is led through the capillary tube as a strip gas. Through the pores on the membrane surface, all dissolved gases in the water are transferred into the strip gas.

 
Step 2: Biogas upgrading with membrane contactors

Ingenieurbüro Buse GmbH in Winsen

Degassed water flows on the outside of the hollow fiber membrane. The Biogas flow takes place in a counter current flow on the inside of the hollow fiber membrane. The highly water soluble CO2 content of the biogas is transferred through the micro pores of the hydrophobic membrane and dissolved by circulating water. Refined biomethane exits the plant at the gas outlet of the membrane contactor.

Advantages of the Ingenieurbüro Buse GmbH process

  • Low energy input due to low pressure procedure
  • Low size ratio due to the application of membrane technique
  • Low water consumption
  • No application of process chemicals needed
  • Low maintenance and operation time and effort

 

Contact us for more detailed information!

Ingenieurbüro Buse GmbH - 2012 ©