DMT builds biogas upgradingsplant at Zwolle (11-6-2010)
06-12-2010
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The project at Natuurgas Overijssel
Gas cleaning
Natuurgas Overijssel, a cluster of waste organisations ROVA and HVC Groep, process 45.000 tons of household compostable waste into 12.000 tons of compost and over 3 million Nm3 of biogas, with a methane content of 50 - 70%. The gas upgrade equipment processes the biogas into natural-gas quality at a rate of 520 Nm3 per hour.
Upgrading technique:
DMT Environmental Technology DMT is a member of the Coalition for Driving on Biogas, and has specialised in desulphurisation and upgrading processes for biogas for over 20 years. The TS-PWS process used by DMT is a further development of the PWS (pressure water scrubber) technology. This process has been developed in order to remove CO2, hydrogen sulphide, ammonia, higher hydrocarbons and siloxanes, and to minimise waste residues. Gas is dried and brought up to a pressure of 8 -10 bar. The only residue: air with a high concentration of CO2. This can be used in commercial horticultural greenhouses. Capacities of 100 – 5.000 Nm3 per hour are possible. The equipment is compact and is constructed (on a modular basis) in shipping containers.
Project ‘Rijden op GFT ‘ (driving on compostable waste)
As part of this project, a number of vehicles demonstrate driving on green gas. Vehicles were selected that had been fitted with natural-gas engines by the manufacturer. Cars, delivery vans and buses, as well as the most modern dustcarts and street-cleaning machines can also run on gas. In Zwolle, a public filling station has been fitted with a refuelling point for green gas. The project is financed by Natuurgas Overijssel, Salland Oil and the province of Overijssel.
Groen gas in natural-gas grid
At the beginning of 2009, Natuurgas Overijssel, Gasunie and Enexis signed a collaboration agreement to implement a demonstration project. A new pipeline (8 bar) will transport green gas to a compressor, from where it will be injected into the high-pressure (40 bar) grid run by Gasunie. The supply of green gas to clients will be based on a certification system, such as also exists for green electricity. The province of Overijssel and Gasterra also contribute to this project.
Research into eff iciency
The installation includes a range of facilities to minimise microorganisms and other substances. The gas is eventually passed through a HEPA filter (this type of filter is also used in hospitals). Part of the project objectives are to study whether or not these extra measures are really necessary, and how risk minimisation can be achieved more efficiently and economically in the future.
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