Even with the use of biomass as a fuel for thermal use and the resulting CO2neutrality, there is a great energy-saving potential with the re-use of the energy. In order to exploit this potential, it is already necessary during the preliminary planning to qualify the appropriate air and gas cleaning systems for heat decoupling. With its more than 100-year-old tradition in emission reduction systems, EWK Umwelttechnik relies on proven technology and experience. Filtering or electrostatic separators (with or without sorption) are used for acidic components or wet absorbers, wet electrofilters or catalytic reduction or oxidation systems.
The diversity of emissions often makes it necessary to use system combinations to comply with the pollutant limit values. The mostly inhomogeneous gas mixtures also produce reaction products, which means that a sensitive selection of the required materials has to be made. In particular, water and acid dew points, must be observed.
For plants for drying food and feed, biomass, or wood, the exhaust gas or process gas temperature is 120-150 °C. There are high humidity, so that the heat content at dew point temperatures of 60-80 °C offers a high heat potential. Due to the ingredients of the process gases, wet cleaning systems must be used, whereby the heat decoupling is then carried out directly from the liquid cycle.
Specially developed heat exchanger/condensation systems (absorbat/gas or absorbate/water or gas/gas) are then integrated components. Through the heat decoupling, the heating of production halls, the temperature control of materials can be carried out or a separate local heating network can be fed in, to which the own company but also other companies, municipalities or residential areas can be connected.
At flow temperatures of 65-75 °C, this “energy source” can usually replace other energy generators. Only for a short time in winter is an increase in the mains temperature may be necessary to cover heat deficits.
Energy that should not get into the atmosphere unused !!
For chip and OSB dryers with a capacity of 35 MW, up to 22 MW ( 30 – 65 ) can be recovered economically. Even with a full use of only 4,000 hours per year, this means a saving of 8 million litres of heating oil per year for fossil fuels, i.e. at €0.65/l approx. EUR 5.2 million per year. The additional investments for the integrated solution are 0.15-0.40 million per MW of heat output.
Payback usually less than 3 years !!
Another success of such systems is the relief of the environment by reducingCO2emissions but also from heat emissions that cause the greenhouse effect
If one considers the total energy demand for heating and process heat in industry, the energy consumption can be significantly reduced with integrated heat decoupling/condensation systems. Since this generated energy is usually constantly available or directly relieves one’s own needs, the integrated solution is in any case also the more economical and ecologically important option for reducing energy consumption.
Over the past 15 years, EWK Umwelttechnik has planned and developed a large number of integrated emission reduction/heat decoupling systems. Despite the initial additional investments, a high level of profitability and a reduction in operating costs with an early return to capital was shown.