Abstract
The conversion between thermal energy and mechanical energy can be realized through the thermal cycle of working medium in a series of power plants. For the thermodynamic analysis of the thermal cycle, it mainly analyzes the thermal efficiency and steam consumption rate of the cycle to analyze the main factors affecting the thermal efficiency of the cycle, and the measures to improve the thermal efficiency, in order to reduce the fuel consumption and reduce the power generation cost.
Highlights
The steam power cycle is an effective way to convert heat energy into mechanical energy continuously
The upper limit temperature of the saturated steam, Carnot cycle can only be below its critical temperature, and the lower limit temperature can only be higher than the ambient temperature, so the temperature difference between them is small
When the fresh steam expands to p0=3.5MPa in the steam turbine, a part of the steam is extracted for regenerative heating, and the rest is sent to the reheater to be heated to 500°C, and returns to the steam turbine to do work
Summary
The steam power cycle is an effective way to convert heat energy into mechanical energy continuously. According to the second law of thermodynamics, the Carnot cycle has the highest thermal efficiency of all cycles in a specific temperature range. It is difficult to realize the Carnot cycle when saturated steam is used as working fluid. The upper limit temperature of the saturated steam, Carnot cycle can only be below its critical temperature, and the lower limit temperature can only be higher than the ambient temperature, so the temperature difference between them is small. Even if the Carnot cycle with saturated steam is realized, its thermal efficiency is not very high. The Rankine cycle has become a basic cycle widely used in modern thermal power plants. The actual cycles of steam power plants are very complex, but they are all improved based on the primary cycle. What are the economic differences of these improved steam power cycles? Let us compare them with specific examples
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