Abstract
The variable working condition of thermal system refers to that the working condition in the system changes, deviates from the design working condition or deviates from a certain reference working condition. There are various reasons for the change of thermal system’s off design condition, including the change of unit heat load, the change of thermal system and equipment, and the change of steam parameters and reheat parameters. The purpose of variable condition calculation of thermodynamic system is to determine the steam parameters of each extraction port and exhaust end of the turbine and the corresponding parameters of the regenerative system. Its essence is to determine the new expansion process line and system parameters of the turbine. This is the basis for the safety and reliability analysis of the system under off design conditions and the calculation and analysis of economic indicators. Through the research on the electrothermal coupling characteristics of thermoelectric units under variable operating conditions, it can provide data support for the power grid dispatching department to master the electrical output characteristics of thermoelectric units in heating seasons.
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