USE OF RDF TO GENERATE ELECTRICITY IN A COMBINED CYCLE GAS TURBINE PLANT AT A CHP PLANT IN ST. PETERSBURG

The study is devoted to the substantiation of a technology that promotes the involvement of municipal solid waste (MSW) in the production of electric and thermal energy through gasification. The purpose of the study is to select the technology of gasification of RDF for the subsequent use of producer gas in the production of electric and thermal energy in the combined cycle at a CHP plant for the conditions of St. Petersburg city. During the research, the approximate composition and potential yield of RDF are evaluated. The possible types of gasifier, the type of gasifying agent and the amount of producer gas produced per unit of RDF are determined. The energy potential of the combined cycle per unit of RDF is identified. The potential output of RDF for the conditions of St. Petersburg is 311 thousand tons of standard fuel per year. The highest output of producer gas is obtained with steam-air blasting at atmospheric pressure – 2,994 m3/kg of RDF. At the same time, the highest energy potential of producer gas is obtained with steam-oxygen gasification. The achievable electric power of a combined cycle gas turbine (CCGT) plant using producer gas obtained by gasification of RDF in the conditions of St. Petersburg is estimated at 70 ÷ 150 MW.