| The thermal economy of the unit is decreasing following the increasing of carbon capture rate with the carbon capture system which is using turbine steam extraction providing the solution renewable energy consumption. The main reason is that:the increasing of carbon capture capacity cause the increasing of turbine steam extraction, so the loss of working substance with heat increases, the power acting capacity decreases and the thermal economy of the unit drops.To aim at the problem of high energy consumption and high cost of the CO2emission reduction systems in power plants, the coupling mechanism and system integration optimization of solar energy collection system, CO2emission reduction system and thermodynamic system of thermal power units are researched. Based on equivalent heat drop method, the thermal economy changes of different carbon capture rates at different conditions of THA,75%THA, and50%THA are simulated and analyzed, and the variation tendency of the unit’s thermal economy under different carbon capture rates is also obtained. Combining with the energy consumption characteristic analysis, the operating cost of the system is comparatively analyzed, and the graph of thermal cost changes is also draw. So the situation of thermal economy changes is explained from the point of number and shape.On this basis, the optimization design of system integration scheme is carried out. Compared with the thermal power units without carbon capture systems, the600MW new integration system and traditional carbon capture system without solar energy system increase the relative efficiency of the unit but not decrease it. Under the carbon capture rate of90%, the thermal cycle efficiency increases by0.86%,0.98%and0.97%in the conditions of THA,50%THA and75%THA separately, but the one of traditional carbon capture system decreases by23.16%,24.41%and24.98%respectively. It provides a reference to realizing low energy and low cost of CO2emissions. |
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