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Clean, high-efficiency energy generation. |
Königs Wusterhausen Biomass Power Plant commenced regular operations in 2003 after a planning and construction period of just 21 months. The plant can accept waste timber and non-recyclable timber either as a finished fuel or as a raw material.
Boiler with circulating fluidised bed
The plant combusts around 16 tonnes of treated waste timber and non-recyclable timber every hour. The biomass boiler operates on the Implementation of the circulating fluidised bed principle. This offers the benefit of good burnout levels due to the comparatively long period spend by the fuel in the combustion chamber in conjunction with a high degree of de-sulphurisation and low NO2 emissions.
High level of electrical efficiency
The energy is extracted from the flue gas flow and the circulating sand and ash flow. This facilitates a high level of fuel energy content and a high level of electrical efficiency of more than 35 percent. Around 64 tonnes of steam are generated an hour. The steam powers a condensing turbine which in turn produces 20 megawatts of electrical output via a generator.
Multi-stage flue gas cleaning
The flue gas cleaning plant uses the latest technology to undercut the strict legal threshold values. Acidic noxious gases, heavy metals, dioxins and furans are bonded by adding calcium hydrates and activated coke and removed together with the remaining dust using a baghouse filter. The residues resulting from flue gas cleaning are used as backfill in the mining industry.
| Facts and figures | |
| Approval | In accordance with 17th Federal Immision Control Ordinance |
| Subsidy period (EEG) | 20 years |
| Commissioned | 2003 |
| Types of timber | AI–AIV timbers (as defined in the Waste Timber Ordinance) |
| Firing | Circulating fluidised bed |
| Timber silos | 2 × 7.500 m³ capacity |
| Annual throughput | 120,000 Mg/a |
| Treatment capacity | 50 Mg/h |
| Imputed calorific value | 15,400 kJ/kg |
| Electrical efficiency | > 35 percent |
| Electricity output | 160,000 MWh/a |
| Personnel | Power plant: 17 employees Treatment: 10 employees |
The use of waste and non-recyclable timber in Germany is governed by the Waste Timber Ordinance. This divides the timber into various quality categories:
- AI: Untreated waste timber with insubstantial contamination
- AII: Treated waste timber which is glued, varnished, coated or painted
- AIII: Waste timber with halogen-organic compounds in the coating, but not wood preservers
- AIV: Waste timber treated with wood preservers with a high contaminant load (excluding waste pcb timber)
