The replacement of the T-250/300-23,5 turbine at power unit no. 9 Of CHPP-22, MOSENERGO PJSC

There are 22 power units with T-250/300-23,5 turbines in Russia: 19 power units at CHPPs in Moscow and 3 power units at CHPPs in St. Petersburg. The total specified service life of a steam turbine is at least 40 years, therefore, the turbines produced in the 1970s already need to be replaced, reconstructed or modernized. The technical policy adopted by Gazprom Energoholding LLC and Mosenergo PJSC does not present any solutions for replacement of the said turbines and units. This made it difficult to choose an option for replacing a decommissioned turbine of power unit No. 9 of CHPP-22, Mosenergo PJSC. CHPP-22 is the only CHPP in the Moscow region, capable of burning natural gas and pulverized coal. The plant plans to replace the T-250/300-23,5 turbine with the turbine-entry steam temperature and the reheat temperature of 540/540°С with a T-295/335-23,5 turbine with the turbine-entry steam temperature and the reheat temperature of 565/565°С. The equipment reconstruction contract does not involve any update of the steam generator used at the power unit or carrying out works to reduce emissions from the combustion of pulverized coal. This will make it impossible for the unit to operate at higher steam temperature, and there will be no possibility to switch from natural gas to pulverized-coal fuel; it will only be possible to use natural gas. The adopted version of the reconstruction of power unit No. 9 of CHPP-22, Mosenergo PJSC will lead to increased costs of the power unit equipment reconstruction, which may lead to increased tariff s for electricity and heat supply. It is necessary to quickly come up with an effective way to upgrade T-250/300-23,5 turbines and units using those, and to submit a solution for a comprehensive discussion with the participation of the interested national scientific community.

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