The use of biomass and recycled fuels speeds up corrosion, resulting in a significantly shorter superheater lifetime. Unmanaged corrosion also leads to failure risks and unplanned shutdowns. Dealing with corrosion is a cost for power producers. The Metso Corrosion Management solution tackles the effects of corrosion, optimizes the fuel diet and extends equipment lifetime. Power producers no longer need to avoid inexpensive, lower-quality fuels due to risks of corrosion.

Until now, the boiler has been run with just minimal dynamic information about possible corrosion problems. By incorporating its long experience in various fuels, superheater materials, processes, online measurement technology and process automation systems, Metso has created an eye that provides more information about what takes place inside the boiler.

The Metso Fuel Diet™ Corrosion Management solution measures and reports the level of corrosion and controls the amount of corrosive gases in the boiler. It gives relevant information for fuel diet optimization and helps plan preventive maintenance and replacement operations. With the solution, power plants are able to extend their superheaters’ lifetime, maximize fuel flexibility, optimize fuel economy and lower their environmental impact. It is a solution that offers rapid payback on the initial investment.

Reporting, control and prediction in one package

The Metso Fuel Diet™ alkali chloride induced high-temperature corrosion management solution consists of the following blocks:
* Metso DNA Corrosion Manager – Software for reporting, controlling and predicting high-temperature corrosion, and optimizing the fuel diet
* Metso Corrosion Reduction Analyzer – Online measurement unit analyzing the corrosivity of flue gases
* Measures and remedies – CorroStop additives and systems to take real-time preventive actions

The Metso Corrosion Reduction Analyzer consists of an analyzer unit and a sampling device. Using proven titration technology, the analyzer measures total chlorine concentration and effective sulfur concentration from the flue gas and calculates the flue gas sulfur/chlorine molar ratio for corrosion risk and rate evaluation.

Metso Corrosion Management provides a new possibility to monitor the boiler condition and control alkali chloride induced high?temperature corrosion. It provides a control package to prevent superheater corrosion or to set corrosion at an acceptable level by modifying process parameters, dosing additive or setting the optimal fuel diet. The liquid CorroStop additives are ferric [Fe2(SO4)3] or aluminum sulfate [Al2(SO4)3], which are injected into the upper furnace upstream of the superheater region. Another option is to dose sulfur granulates into the fuel flow. This product is called CorroStop+. Predictability of the corrosion risk helps to avoid unplanned shutdowns. Service periods and maintenance actions can be planned in advance by knowing the real-time corrosion rate.

Metso’s pulp, paper and power professionals specialize in processes, machinery, equipment, services, paper machine clothing and filter fabrics. Our offering and experience cover the entire process life cycle, including new production lines, rebuilds and services.,

The Automation segment’s process automation and flow control solutions meet the growing needs of Metso’s customer industries to improve production process efficiency as raw materials and energy sources become scarcer and their costs increase. Our global network of service experts delivers business solutions to our customers that improve their productivity, lower risks and optimize costs.,

Metso is a global supplier of technology and services to customers in the process industries, including mining, construction, pulp and paper, power, and oil and gas. Our 30,000 professionals based in over 50 countries deliver sustainability and profitability to customers worldwide. Expect results.,

For more information, please contact:
Jaani Silvennoinen, Product Manager, Power Generation Performance Solutions, Power Generation, Pulp, Paper and Power, Metso
Tel. +358 40 709 2019

Lasse Kauppinen, Product Manager, Analyzers, Control & Measurement Systems, Automation, Metso
Tel. +358 40 826 7173

Juha-Pekka Jalkanen, Director, Plant Performance Solutions, Energy & Process Systems, Automation, Metso