THE USE OF EXPERIENCE OF COAL COMBUSTION IN A CIRCULATING FLUIDIZED BED FOR DESIGNING OF MEDIUM CAPACITY STEAM BOILERS FOR BURNING OF WET WASTE OF COAL PREPARATION AND RDF IN UKRAINE

Abstract

The necessity to implement advanced combustion technologies to utilize MSW/SRF/RDF and coal reject waste is an important problem for Ukraine to be solved. The introduction of such technologies will favor to involve annually about 2 mln t of RDF and partly cover deficit of bituminous coal, lack of which is currently faced. The technological niche for CFB combustion of RDF/SRF has certain optimal range bearing in mind technological, ecological (2010/75/EU Directive etc.) and financial performance. In view of this it seems reasonable to implement CFB for RDF/SRF firing starting from boiler steam capacity of 50-75 t/h while stoker firing of RDF could be efficiently implemented for lower range. The design of such boiler should rely upon lessons learned of commissioning and operating large-scale CFB boiler (having steam capacity of 670 t/h; 545/545 C) we obtained at Starobeshevo Power Plant in Ukraine. Accounting for the above the analysis of implementation and modifications made at large-scale CFB boiler (cyclones, seal pot, fluidized bed heat exchangers) has been done. The experience was used to design (along with KB “Energomashproekt”) medium-scale CFB boiler (having steam capacity of 75 t/h; 500 C) to burn high ash coal washering wastes and RDF/SRF. The sketch-3D-design of such boiler is presented with key performance. Bibl. 6, Fig. 4, Tab. 4.