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>Flue gas condensation Clean Air Technology

Flue gas condensation makes it possible to obtain and utilize a larger amount of energy in the humid flue gas which normally gets lost in the chimney. With a flue gas condensation plant from Clean Air Technology, the energy output from the fuel may be increased by as much as 20 - 35%. Flue gas condensation may be preformed in one or two steps, i.e. with or without humidifying the combustion air. If required, a scrubber may be placed before the condensing equipment. In the condenser, flue gases are cooled in a heat exchanger by return water from the district heating system. When the temperature of the flue gas is decreased a large portion of the flue gas water vapor condenses and this energy is transferred to and utilized in the district heating system. Further cooling and condensing of the flue gasses takes place in the humidifier. The cooling media in the humidifier is the combustion air headed for the boiler. As the air is heated in the humidifier, warm condensate is sprayed into the air stream and which causes vaporization of the flue gasses. The combustion air which is being fed to the boiler has an increased energy content due to the increased temperature and humidity. This procedure results in increased energy content in the flue gas entering the condenser, which results in more efficient use of energy by the heating system. In a flue gas condensation plant, condensate water is obtained, which, depending on the contents of the flue gas emissions, have to be cleaned before sending the water into the local sewage system. For pH-adjustment to pH=7 sodium hydroxide, lime or acid is used. Contaminates such as solids, heavy metals, and salts may be removed by treatment with precipitation and flocculation, chemicals, followed by sedimentation in lamella filter and/or sand filters. A flue gas condensation plant from Clean Air Technology AB may increase the energy output from the fuel by as much as 20-35%. References Some of our references for flue gas condensation in Sweden are Västerviks Värmevärk, Kärnsjukhuset Skövde, Nässjö Kraftvärmeverk, Kiruna Värmeverks AB, Uddevalla Energi, Jämtkraft AB and Hultsfred Värmeverk.