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WELTEC BIOPOWER: Hungarian Partner INWATECH Installs Spherical Gas Storage Tank

06-25-2012 09:06 PM CET | Energy & Environment

Press release from: WELTEC BIOPOWER GmbH

/ PR Agency: PRSchulz
Hungary makes increasingly use of spherical gas storage tanks.

Hungary makes increasingly use of spherical gas storage tanks.

In the future, the storage of energy in the form of biogas will play an increasingly important role around the globe. WELTEC BIOPOWER has implemented a trend-setting, innovative solution with the Hungarian partner INWATECH.

Where an investment for a biogas processing system with biogas feed-in station is not feasible, the intermediate storage of raw biogas is a smart alternative. The example of the 1-MW plant of WELTEC BIOPOWER, which has been running in Szeged, southern Hungary, since December 2011, demonstrates the benefits of intermediate storage and its positive effect on the plant‘s overall efficiency.

What role will external gas storage tanks play for biogas plant operators in the future, and what shape will be preferred? Answers to these questions are currently available in Hungary. There, the extensive natural gas grid could also be used for biomethane storage. Prior to the feed-in, however, the raw gas would have to be processed, and this effort would not pay for all plant types. Therefore, this EU country increasingly makes use of spherical gas storage tanks, which, in combination with the digesters, provide a high storage capacity.

In Hungary, the daytime power feed-in tariff is twice as high. Therefore, biogas is collected in gas storage tanks at night in order to have the two 600-kW CHP modules running under full load at daytime. At the bottom line, large storage capacities mean a higher feed-in tariff.

Not only the external storage tank, but also the WELTEC digesters offer additional storage space: Apart from the spherical gas storage tank with its 660 cubic metres, each of the two 3,000-cubic metres stainless-steel digesters provides a gas buffer capacity of 1,016 cubic metres, thanks to the special design of the double-membrane roof.

In the two digesters, co-operator INWATECH produces together with Zöldforrás Energia, a subsidiary of the power supplier DÉMÁSZ, 440 cubic metres of raw gas an hour. Assuming an operating time of 7,000 CHP hours a year, the power plant‘s planned output will be more than 4 million kW/year. Going by past experience, the yield will be even higher in real-life use.

The generated heat will be used for the air-conditioning of the on-site office buildings. Additionally, the exhaust heat will serve the complete drying of lucernes and pellets and the heating of pigsties (300 kW): Heat will be supplied for about 20 h/day for nine months a year. The heat utilization will boost the plant‘s efficiency to more than 80 percent, and the thermal energy utilization will amount to about 9 million kWh/year. As the digesters consume about 1.2 million kWh of process heat, the surplus will be about 7.7 million kWh/year.

The operator could also have opted for other storage tank shapes for the plant. Besides the fact that the additional costs for the spherical gas storage in Szeged are covered by a higher feed-in tariff, the safety of the storage tank was a key criterion for the selection. As it had already used this storage tank type in other projects with excellent results, Hungarian partner INWATECH considered the spherical gas storage tank to be the solution of choice.

In Germany, the demand for external storage tanks is limited despite the great interest. Should this change as a result of the discussions concerning the energy transition of the federal govern- ment, WELTEC will be able to draw on it’s successfully implemented best-practice solution in Hungary.

Thus, WELTEC BIOPOWER will continue to promote this model in Hungary. In fact, further orders for biogas plants with spherical gas storage tanks have already been received. Hajo Schierhold, Head of sales, says: „Following our proven approach, the plants will be planned and realized together with the cooperation partner INWATECH.“

In 2011, WELTEC BIOPOWER GmbH, one of the first manufacturers of biogas plants, celebrated its 10th anniversary. WELTEC is one of the pioneers of the constructors of biogas plants. Based on the modern approach of experienced engineers, the company from Vechta (Lower Saxony) with its expertise of a staff of close to 80, offers complete biogas plants from one source and has developed to a leading constructor of biogas plants in the world.
As the hydrogen sulphide and ammonia compounds contained in biogas corrode unprotected parts, WELTEC builds the digesters from stainless steel. This ensures a long useful life of the plant. The manufacturing depth also guarantees a consistently high standard regardless of the location and ensures an export rate that is far above the industry average.
The plants have a modular structure. WELTEC BIOPOWER uses only proven system components and develops most of the technologies along the entire value chain internally: digester technology, mixing technology, control technology, hygienisation systems, and digestate processing solutions originate from the company.
By means of its comprehensive services, WELTEC ensures the technical and economic stability of the biogas plants. The CHP service guarantees stable output, the biological supervision ensures continuous monitoring of the relevant parameters, and systematic repowering makes sure that the biogas plant is always up to date. Operators can choose from a range of service packages of different types and scope.
One of the main strengths of the medium-sized enterprise is the ability to deliver individual and flexible solutions – from compact plants to large computer-controlled plants in the megawatt range, waste recycling plants, and biogas parks with gas processing technology.

Zum Langenberg 2
49377 Vechta

Thomas Wilkens Marketing
Phone: +49 4441/99978-220

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