Technical solutions for a modernized TPE-216M boiler in a highly efficient unit

A design is presented for a modernized lignite-fired TPE-216M boiler for a highly efficient 225-MW power-generating unit, which can be installed at the Kharanorskaya state area power plant (Station No. 3). The boiler has a guaranteed gross efficiency of 92.5%, and satisfies modern ecological requirements: NOx concentration of less then 300 mg/m3 in the flue gases, owing to the high gross efficiency of the unit, which is no less than 40%, NOx emissions computed per 1 kW · h are reduced additionally by 10%, and the same applies to CO2 emissions. The temperature of the steam is raised from 545 to 565°C. A low-pressure water economizer, which is included in the heat diagram of the unit, is installed to lower the temperature of the exiting gases.