Abstract
In order to save the energy of the trigeneration system based on gas-steam combined cycle, this paper proposes to explore optimal operation modes related to primary energy saving (PES) and operating costing saving (OCS) respectively, by considering the parallel operation of the gas turbine and the steam turbine valve. By taking the summer load of an office building group as the research object, the variations of controllable parameters and indexes are analysed in the trigeneration system with the traditional operation mode and the optimal operation modes. The results suggest that the proposed two operation modes over energy saving and economic aspects are more appropriate than the traditional modes.
Highlights
A trigeneration system (TS) could involve multiple inputs and outputs
In order to analyze the changes of the indicators before and after the operation of the trigeneration system intuitively, the primary energy consumption rate is selected as the optimization target and evaluation index of the trigeneration system, which is defined as the ratio of the difference between the Primary Energy Consumption (PEC) of the separate system (SS) and the trigeneration system to the PEC of the separate system
The proportion of extraction steam will only rise when electric load decreases in the noon and the colding load decreases in the evening; In following the thermal load mode, the proportion of extraction steam is in the maximum opening state during the day, maintaining the maximum extraction
Summary
A trigeneration system (TS) could involve multiple inputs and outputs. How to meet the demand is an important question for a trigeneration system. Appropriate operation mode can improve the performance of trigeneration system. There are two typical operation modes for trigeneration system as follows:. The system gives priority to generate enough heat to meet the external thermal load or the colding load, and the insufficient electric load are supplemented by the public electric grid or other power supply methods. In the scenario of peak-to-valley electricity price, this paper constructs a combined cooling and heating power supply system based on gas-steam combined cycle and establishes its characteristic model. In the load situation of a typical summer day, through the variations of controllable parameters, the indexes in the trigeneration system in these two operating modes, i.e., the following the electric load and following the thermal load, are compared with the results of the traditional modes.
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