VEAG Vereinigte Energiewerke AG

The fuel composition for the substitute heating plant at Luebbenau is 50% wood, 30% brown coal, and 20% plant biomass.Fluidized bed firing installations were used; the main component was atm. fluidized bed boiler with flue gas recycle.The installation comprised combined heat-power coupling in combination with an oil boiler.the thermal capacity of the installation was >50 MW.The limit values and the expected values of the pollutants (dust, CO, NO_x, SO₂, SO₃, S) are given.

The paper deals with the handling and use of gypsum in conformity with the regulations existing under the Water Resources Management Law (WHG) for the handling and use of substances hazardous to water.The Gypsum Association and VDEW/VGB have set up a joint Working Group which is engaged in discussions with the competent agencies in the Bundeslander (federal states) to determine appropriate ways for enforcing the regulations of VwVwS.The classification of gypsum into Water Hazard Class (Wassergefahrdungsklasse - WGK) 1 has brought about situations which are not covered by the currently existing administrative regulations and where the application of existing regulations would cause considerable problems in practice.If the principle of commensurability is applied, it will also be possible for gypsum, a material widely used in the construction industry, to adequately meet the requirements of the WHG.Based on the experience gained so far in the field of handling and storage of gypsum, we are of the opinion that, in spite of the reclassification of CaSO₄ into WGK 1, the procedure currently applied by VEAG and its partners from the mining and gypsum industries meets the requirements of 19 g para.1 Of the Water Resources Management Law, i.e., the facilities used for the handling of substances hazardous to waters - in this case gypsum - are maintained and operated in such a way that there is neither a danger of pollution of waters nor of any other adverse effect on their quality.Therefore, together with the gypsum industry, we support the stand taken by the BDI, namely:.- Facilities in which "WGK 0 substances" have been handled till now should remain unaffected by the reclassification.- Surface paving and sealing as well as infrastructural measures should be limited to the extent required by the danger actually existing.- The requirement to repeatedly subject LAU facilities for solid substances to inspections should be dispensed with.- The special conditions existing in quarries and former open-cut areas in regard of the storage of substances hazardous to waters should be taken into account.- The responsibility of operators should be considered as an essential element of soil and water protection, i.e., the operators of facilities should have the appropriate means and qualified personnel for safely operating the facilities.

Desulfurization of flue gases from brown coal-fired elec. power plants was investigated.On a pilot-plant scale, replacement of limestone suspension with milk of lime for SO₂ absorption was examinedSlaking of granular lime provided milk of lime with higher reactivity than that obtained by slaking of lime dust.