![]() ![]() Wellman-Lord process, the SO 2 is regenerated from the sorbent(sodium sulphite), which is returned to absorb more SO 2. The non-regenerable systems produce a product which is either disposed of as waste or sold as a by-product e.g. These processes can be grouped into non-regenerable systems and regenerable systems. Abu-Ashur, B.M.įlue gas desulphurization process are discussed. Despite the environmental benefits, however, there is concern that the negative aspects of the programme (choice of technology, waste disposal, by-product disposal) may delay implementation and thus threaten Britain's aim of 30% reduction by 1999. The CEGB has used limestone/gypsum at Drax A B, West Burton, Fawley and Kingsnorth, and Wellman Lord at Fiddlers Ferry. Three systems appear suitable for UK installations: limestone/gypsum, regenerative Wellman Lord, and spray dry. Retrofitting UK power plants with flue gas desulfurization equipment should reduce SO emission by around 15%. The British flue gas desulphurisation programme The following wet and dry flue gas desulphurisation processes are discussed briefly: alkali injection, adsorption processes, Davy/ Wellman-Lord, lime/limestone, double alkali, citrate, aqueous carbonate, spray absorption and magnesium oxide. Three methods of washing power station coal are first described and their effectiveness is discussed. (In German)Ĭoal desulphurisation as a method of sulphur dioxide emission control Advantages, in addition to reducing air pollution and marketing sulfur products, are also seen in the absence of sulfur containing wastes for disposal. Electricity production costs in the power plants due to desulfurization of waste gases will increase by an estimated 15%. Chemical details and the technological flow sheet are discussed. Sodium sulfate is another commercial by-product obtained from the sodium sulfide regeneration cycle. The resulting concentrated sulfur dioxide gas is used for pure sulfur and sulfuric acid production. The technology is based on washing the gases with sodium sulfide. ![]() The Wellman-Lord technology achieves a higher than 90% desulfurization of industrial waste gases. A second unit is being installed at the larger coal power plant in San Juan, New Mexico. The demonstration unit is annexed to a 115 MW block at the Gary power plant in Indiana, USA. Sulfur gained from flue gas, a demonstration unit of the Wellman-Lord process annexed to a black coal power plantĮnergy Technology Data Exchange (ETDEWEB)ĭetails of reducing air pollution by desulfurization of flue gases are presented. key words: SO 2 removal, flue gases, absorption The employment of this system also leads to significant decreasing of the NO x emissions. Moreover, the incorporation in the installation of our system with contact economizers of second generation, already in industrial application, enables utilization of the waste heat of the flue gases for district heating. The improved method uses about 40% less heat for absorbent regeneration, in comparison to the existing applications of the method Wellman-Lord, and gives in addition the possibility to regenerate 95% of the consumed heat for heating water streams to about 90Â☌. Three solutions are discussed for significant enhancement of the method efficiency on the basis of a considerable increasing of the SO 2 concentration in the saturated absorbent. A technological and economical evaluation of this regenerative method is presented in comparison to the non-regenerative gypsum method, using data from the existing sources and our own experience from the development of an innovative gypsum technology. The data discussed in the literature sources on flue gas desulfurization demonstrate the predominance of the methods with lime or limestone as absorbent, due to higher capital investments associated with the method of Wellman-Lord. The SO 2 removed from the flue gases is obtained as a pure product for use in chemical, food or wine production. The regenerated solution returns in the absorber. The latter is dissolved in water from condensation of the steam carrying SO 2 from the evaporator. After evaporation of the solution, SO 2 and sodium sulfite are obtained. The absorber is a packed column with multiple stages. It is characterized by absorption of sulfur dioxide with sodium sulfite solution, which reacts to form sodium bisulfite. Kolev, D.įull text: Investigations on development of energy efficient technology for SO 2 removal from flue gases of combustion systems by using the method Wellman-Lord are presented. International Nuclear Information System (INIS)ĭzhonova-Atanasova, D. Energy efficient SO2 removal from flue gases using the method Wellman-Lord ![]()
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