ANALIZA INTEGRACJI INSTALACJI WYTWARZAJĄCEJ ODNAWIALNY METANOL Z NOWOCZESNĄ ELEKTROWNIĄ GAZOWO – PAROWĄ Z CCS W TECHNOLOGII OXY–COMBUSTION – EFEKTY SYNERGII

The article presents a thermodynamic analysis and benefits resulting from the integration of a system generating methanol from CO₂ coming from a modern combined cycle power plant with CCS operating in the oxy-combustion technology. The "renewable" methanol production system uses a 90 MW wind farm to power hydrogen generators. The analysis is presented in a wide range of functions of the nominal power of electrolysers related to the power of the wind farm N_HG.nom/N_WF.nom (0.01 ÷ 0.45). The synergy effect accompanying the integration of the methanol production installation with the CCS gas and steam power plant was demonstrated, resulting both from increasing the efficiency of the units and the installation itself. Integration with the unit (for N_HG.nom/N_WF.nom = 0.45) allowed to increase the efficiency of the installation η_MG by 1.84 pp. to the value of η_MG = 70.88%, which in consequence allowed the increase of the efficiency of the entire system to a level exceeding 56% (an increase by 1.46 pp compared to the reference variant). Using waste heat streams and the chemical energy of residual gases, the efficiency of the installation η_MG.Q.E increases by 2.11 pp. up to the value of η_MG.Q.E = 81.5% (the efficiency of the entire system then reaches a maximum of η = 64.41%). Integration on the side of the power plant in the O:8WF variant made it possible to increase the electrical efficiency of the gas turbine by 0.24 pp, and in the case of the entire power plant by 0.54 pp of net electrical efficiency.