ChlorOut concept in Germany
Vattenfall has developed and patented the ChlorOut concept which is effective against corrosion. At the Müllverwertung Borsigstraße plant, in Hamburg, a permanent installation of ChlorOut will take place.
The sulphate-containing group of additives called ChlorOut is very effective in reducing corrosion and fouling of superheaters by reducing the amount of corrosive alkali chlorides in the gas phase. This concept is already installed in many biomass fired plants and will be used also in waste fired units. Within the EU co-financed project NextGen BioWaste, Vattenfall Europe New Energy, Vattenfall Power Consultant and Vattenfall Research and Development will make a permanent installation of ChlorOut in a boiler at the waste incineration plant Müllverwertung Borsigstraße (MVB) in Hamburg. The goal is to double the lifetime of the superheaters and thus reduce maintenance costs. Extensive tests with ChlorOut were performed in the plant during 2006.
Monitoring the tests
To optimise the alkali chloride reduction in the flue gas, the additives were injected at four different vertical levels in the boiler. The additives were also injected at different rates at each level tested. In order to monitor the alkali chloride reduction in real-time, a Vattenfall developed instrument called IACM (In-situ Alkali Chloride Monitor) was used. For monitoring of other changes in the chemical composition in the flue gas a FTIR instrument was used. Also, on-line (in-situ) corrosions sensors were used during the test. To measure the chloride content in the deposits formed, triple-temperature-deposition probes were mounted during some tests. Signals measuring the emission of some key pollutant species were monitored in real-time. A single test may last from 1 to 3 hours. The time spent to perform all tests was five weeks.
Permanent installation of ChlorOut
The results from the tests were used for designing a permanent ChlorOut system at MVB. The permanent installation is planned for the end of 2007.
Jump directly to: Top of text , Search , Main navigation , sub navigation , meta navigation , Top of page
