A novel combined cooling heating and power system with coupled compressed air energy storage and supercharged diesel engine

doi:10.19799/j.cnki.2095-4239.2020.0150

Abstract

Abstract:

To solve the problem of intermittent and fluctuating energy output in renewable energy power generation systems, a small-scale combined cooling, heating and power (CCHP) system with compressed air energy storage and supercharged internal combustion engine technology is proposed based on the laws of thermodynamic and the principle of cascade energy utilization. The thermodynamic model of the system is established and the thermodynamic properties of the system are analyzed. The effects of isentropic efficiency and outlet pressure of compressor, isentropic efficiency and inlet pressure of expander, efficiency of heat exchanger and inlet pressure of diesel engine on system performance are emphatically discussed. The simulation indicates that under the design condition, the energy efficiency, exergy efficiency and energy saving rate (ESR) are respectively 86.08%, 59.45% and 43.50%. The inlet pressure of the expander has little influence on the energy efficiency of the system, which effectively improves the problem of variable operating conditions in the process of power generation. Energy efficiency, exergy efficiency and energy saving rate of the system increase with the rising the efficiency of heat exchanger and the inlet pressure of diesel engine in the system. The results provide a theoretical basis for the engineering application of the system.

Key words: distributed compress air energy storage, diesel engine supercharging technology, combined cooling, heating and power, thermodynamic analysis

CLC Number:

TK 02

Zhenshuai YANG, Huanran WANG, Ruixiong LI, Yan ZHANG, Hao CHEN, Zhibo LI, Erren YAO. A novel combined cooling heating and power system with coupled compressed air energy storage and supercharged diesel engine[J]. Energy Storage Science and Technology, 2020, 9(6): 1917-1925.

Figures/Tables 9

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Table 1

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参数	数值
环境温度/^oC	25
环境压力/kPa	101.325
空气绝热系数	1.4
水比热容/kJ·kg^-1·K^-1	4.20
空气质量流量/kg·s^-1	1
压气机等熵效率	0.8
透平膨胀机等熵效率	0.85
换热器效能	0.85
冷凝温度/^oC	30
蒸发温度/^oC	7
储能压力/MPa	7.2
释能压力/MPa	5.0
内燃机进气压力/kPa	283.71

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