Power Utilities

Avedøreværket

Hvidovre Denmark

The two boilers at Avedøreværket produce electricity for about 600,000 households and district heating for about 200,000 households in Greater Copenhagen, primarily by burning biomass in the form of wood pellets. Before burning, the plant adds 2-3 percent ash, both to optimise the fire value and to keep the catalysts in the flue gas systems clean. After burning, the ash can be used to produce cement. At the same time, there are differences in the amount of ash that needs to be added in the two blocks, so they need accurate measurements.

"First of all, the weight has to be right. Then we create a parts list with all the components and sign off that these are exactly the components - and no others - we have used, and then they come from FORCE in Denmark and verify it. It's all about repeatability and not being able to tamper with the data afterwards," says Jesper Juul Jørgensen, product specialist at Siemens. The scale is controlled via a SIMATIC PCS 7 solution and is connected to the Avedøreværket network via PROFINET. "Data comes directly into our SRO system, so our administrative staff can pull data out themselves for regulatory processing and for the energy trading system," says Jens Nybo Stilling Sørensen.

"To ensure correct settlement of the CO2 tax, we need to be able to document to the authorities exactly how much ash we mix in. We use the scale both to comply with all regulations to the authorities and to regulate the addition so that we get the right mixing ratio"

Jens Nybo Stilling Sørensen, Senior Business Project Manager at Ørsted

A MMI-2 belt conveyor scale installed in a telestacker enables Avedøreværket to prepare an accurate CO2 statement for the authorities. The scale weighs the fly ash that is added to the biofuel as the ash travels on a conveyor belt.
A simple solution with some modern technology from Siemens has proved to be a stroke of genius at the Avedøreværket. By installing a legal-for-trade approved scale under the conveyor belt that adds wet fly ash to the biofuel, Ørsted can provide accurate calculations of CO2 emissions to the authorities.
Although the legal-for-trade-approved weight is unique, the whole setup of the plant ended up being simpler than first planned. Originally, Avedøreværket had purchased a pumping system to add the wet fly ash to the biomass, but the ash clumped together in the pipes, causing several challenges. This was solved by a much simpler solution, where the wet fly ash is instead placed on an open telestacker. Avedøreværket has both the biomass and the ash transported to the plant's own harbour, and a front-end loader transports the ash from the storage yards to a stacker on the telestacker. The only challenge with this solution was to control the amount of ash, and this was solved with the legal-for-trade -approved weight.

Power Utilities

Avedøreværket

Hvidovre Denmark

Power Utilities

Avedøreværket

Hvidovre Denmark

Completion 2022

Frictionless integration

Completion 2023

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Order 2099

Digitization and Optimization in Quarry with SIEMENS