Abstract
Factories in China are faced with peak-valley electricity prices and carbon reduction policies nowadays. As the adiabatic compressed air energy storage has a potential to store electricity and provide combined cooling, heating and power, in this paper, a cogeneration system based on it is first proposed to meet the comprehensive energy demands of a latex factory. A new assessment method based on daily energy cost savings is also proposed to evaluate its economic performance. Four novel energy supply strategies based on the cogeneration system and two contrast strategies were analyzed and compared. Results show the energy efficiency of the cogeneration system ranged from 89% to 95%. Besides, energy efficiency and exergy efficiency responded oppositely to the heat-to-electric ratio. In addition, the daily energy costs of the novel strategies were significantly lower than those of the contrast ones. Moreover, the air storage pressure affected the economy the most. Given the ceiling storage pressure of 10 MPa, the optimum floor storage pressure for the air storage was 4.5 MPa. Furthermore, when the cogeneration system provided electricity and dry steam only during the peak load period, its assumed internal return rate reached as high as 10.37%. Therefore, this energy supply strategy is suggested as the most promising choice for the latex factory.
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