Typical off-design analytical performances of internal combustion engine cogeneration

doi:10.1007/s11708-009-0007-z

Front Energ Power Eng Chin

2009, Vol. 3

Issue (2) : 184-192 https://doi.org/10.1007/s11708-009-0007-z

RESEARCH ARTICLE

Typical off-design analytical performances of internal combustion engine cogeneration

Xiaohong HE¹(

), Ruixian CAI²

1. Institute of Engineering Thermophysics, Graduate University of Chinese Academy of Sciences, Beijing 100190, China; 2. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China

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Abstract

Based on experimental data, typical off-design characteristic curves with corresponding formulas of internal combustion engine (ICE) are summarized and investigated. In combination with analytical solution of single-pressure heat recovery steam generator (HRSG) and influence of ambient pressure on combined heat and power (CHP) system, off-design operation regularities of ICE cogeneration are analyzed. The approach temperature difference ΔT_a , relative steam production and superheated steam temperature decrease with the decrease in engine load. The total energy efficiency, equivalent exergy efficiency and economic exergy efficiency first increase and then decrease. Therefore, there exists an optimum value, corresponding to ICE best efficiency operating condition. It is worth emphasizing that ΔT_a is likely to be negative in low load condition with high design steam parameter and low ICE design exhaust gas temperature. Compared with single shaft gas turbine cogeneration, ΔT_a in ICE cogeneration is more likely to be negative. The main reason for this is that the gas turbine has an increased exhaust gas flow with the decrease in load; while ICE is on the contrary. Moreover, ICE power output and efficiency decrease with the decrease in ambient pressure. Hence, approach temperature difference, relative steam production and superheated steam temperature decrease rapidly while the cogeneration efficiencies decrease slightly. It is necessary to consider the influence of ambient conditions, especially the optimization of ICE performances at different places, on cogeneration performances.

Keywords internal combustion engine (ICE) cogeneration heat recovery steam generator (HRSG) off-design superheated steam saturated steam ambient pressure

Corresponding Author(s): HE Xiaohong,Email:hexiaohong52@gmail.com

Issue Date: 05 June 2009

Cite this article:

Xiaohong HE,Ruixian CAI. Typical off-design analytical performances of internal combustion engine cogeneration[J]. Front Energ Power Eng Chin, 2009, 3(2): 184-192.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-009-0007-z
https://academic.hep.com.cn/fie/EN/Y2009/V3/I2/184

Fig.1 Schematic diagram of ICE cogeneration

Fig.2 Relative variation of ICE exhaust gas temperature, exhaust gas flow and generation efficiency versus power output
(a) Relative exhaust gas temperature variation; (b) relative exhaust gas flow variation; (c) relative efficiency variation

Fig.3 Analytical off-design performance of saturated steam cogeneration

Fig.4 Off-design performance of efficiency

Fig.5 Influences of ICE design value of exhaust temperature
(a) Approach temperature difference; (b) steam production; (c) power/heat ratio; (d) efficiency

Fig.6 Influence of design steam parameter on the off-design performances of cogeneration
(a) Approach temperature difference; (b) steam production; (c) power/heat ratio; (d) efficiency

Fig.7 Typical off-design performance of superheated steam system

Fig.8 Off-design performance of efficiency

Fig.9 Influence of on approach temperature difference and superheated steam temperature
(a) Approach temperature difference; (b) superheated steam temperature

Fig.10 Influence of different steam pressure on approach temperature difference and superheated steam temperature
(a) Approach temperature difference; (b) superheated steam temperature

Fig.11 Variation of engine main performances under ambient pressure
(a) ICE performance; (b) cogeneration performance; (c) cogeneration efficiency

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