90 MWt biomass-fired boiler plant at Solvay, Rheinberg

Aalborg Energie Technik (AET) assists Solvay in achieving its new greenhouse gas target by means of a new biomass boiler, which will lower the carbon dioxide emissions by 190,000 tonnes/year, as it replaces a coal-fired boiler plant. Solvay has set the target to reduce its greenhouse gas emissions by 1 million tonnes during 2017–2025.

With the high efficiency cogeneration plant, called the Woodpower project, in Rheinberg (Nordrhein-Westphalen), the use of fossil fuel is to be reduced by 25% at the site. The investment is a part of Solvay's strategy to serve their customers in a more sustainable and competitive way.

The biomass boiler will burn recycled wood, which will be sourced locally. It will be designed for a fuel heat input of 90 MWt and a boiler efficiency of 92%. The AET scope of supply includes AET Combustion System, AET Biomass Boiler, AET SNCR DeNOx System, flue gas cleaning system, boiler house, electrical system, and PLC control and SCADA system.

The boiler has a short start-up time and a quick shut-down time as there is almost no refractory in the boiler. This also reduces the risk of slagging, reduces the cost of maintenance considerably and at the same time increases the availability.

The in-house power consumption for the boiler island, including flue gas cleaning, fans and so on, is less than 1.3% of the fuel heat input.

The combination of the AET Combustion System, AET Biomass Boiler and AET SNCR DeNOx System ensure low emissions, which comply with the German 17. BlmSchV and the new BAT associated emission levels from EU. The heavy metals and dioxines and Furanes will be well below the permissible emission limit values.

To ensure a trouble-free integration with the Solvay factory, the same DCS system as is used today at the Solvay factory will be applied for the entire combined heat and power plant. Furthermore, the design of the boiler plant will in some ways be adapted to the existing energy plant at the Solvay site to obtain synergies e.g. for operation and maintenance as well as safety.

With the special design of the boiler, boiler house, bag filter and other components AET has been able to accommodate Solvay's high expectations for noise reduction and plant availability.

Norbert Mülders, site manager at Rheinberg, Solvay, "We are pleased to announce that AET will supply the boiler to our plant in Rheinberg. Some of the critical points for Solvay were to choose a proven technology with relevant references in operation, showing high availability and high efficiency".

Erik Flemming Hansen, sales and marketing director, AET, "We are delighted to have been trusted by Solvay to supply a new boiler for Rheinberg, and to bring our strong competencies in to the project. We will do our very best to ensure that the high expectations of Solvay will be fulfilled. Furthermore, we are pleased to receive a new order in Germany, also due to coal now is being phased out in Germany".

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