The influence of supercooling of the main condensate at the outlet of the condenser on the operation of a cogeneration steam turbine plant

Abstract

Abstract The article considers the issue of the influence of supercooling of the main condensate on the performance of a steam power plant. We describe the calculation method for a steam turbine condenser. Based on the mathematical model of a condenser, we propose a method for calculating supercooling degree of the condensate on its bottom with different air inflows in a turbo unit vacuum system. The degree of the condensate supercooling on the condenser bottom during the operation of the turbine unit in the heat and electricity production mode is determined in the example of the T-110/120-130 UTZ turbine unit. It is shown that an increase of air inflow into the vacuum system by four times leads to an increase in supercooling of the condensate from 3.5 to 11°C. It has been established that an increase in the condensate supercooling leads to additional heat losses of up to 1.100 kW in the turbine unit per a cycle in the power production operating mode and up to 500 kW per a cycle in the heat production mode.