Thermodynamic and economic analysis of a gas-fired absorption heat pump for district heating with cascade recovery of flue gas waste heat

Lu, Ding; Chen, Gaofei; Gong, Maoqiong; Bai, Yin; Xu, Qingyu; Zhao, Yanxing; Shen, Jun

doi:10.1016/j.enconman.2019.01.110

Cited by 29 publications

(10 citation statements)

References 32 publications

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“…The air flow rates used in the experiment include 1.25, 0.625 and 0.9375 m 3 /s. The air flow rate supply is a parameter for analyzing combustion, emissions and reactions of chemical properties contained in oil palm biomass [59][60][61]. The combustion process in the machine requires excess water, however, the excess of water used must have certain limitations.…”

Section: Emission Analysis On Fbcmentioning

confidence: 99%

Experimental Studies on Combustion Characteristics of Oil-Palm Biomass in Fluidized-Bed: A Heat Energy Alternative

Hani

Mahidin

Husin

et al. 2020

ARFMTS

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One of the technologies that can be used to meet energy needs is biomass combustion. In this study, the oil palm biomass fuels used were empty fruit bunches, oil palm fibers, oil palm midribs, and palm kernel shells. This research was carried out by a direct combustion method using a fluidized-bed combustor. The purpose of this experiment was to investigate the reaction of kinetics and the mechanism of combustion of oilpalm biomass in fluidized-bed combustor. The characteristics observed in this test were the combustion temperature profile, flue-gas composition, and the composition of the ash-deposit chemical compound. The results of the experiments conducted showed that the best biomass combustion temperature profile was recorded at 2 kg biomass with an air flow rate of 0.9375 m 3 /s at 90.1%. The maximum temperature of biomass combustion recorded at biomass 3 kg with an air flow rate of 1.25 m 3 /s are 950 o C (95%). The higher conversion combustion of biomass was found at biomass condition of 3 kg with an air flow rate of 0.9375 m 3 /s. The value of O2 emissions from biomass combustion shows that it was very small 0.2%. While the highest CO2 value was recorded at 19.9%. The highest combustion efficiency on FBC found 1 kg of biomass fuel with an air flow rate of 0.0654 m 3 /s recorded 94.9%.

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Section: Emission Analysis On Fbcmentioning

confidence: 99%

Experimental Studies on Combustion Characteristics of Oil-Palm Biomass in Fluidized-Bed: A Heat Energy Alternative

Hani

Mahidin

Husin

et al. 2020

ARFMTS

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“…Three AHPs were discussed with natural gas-fired boiler by Qu et al 1 These AHPs (exhaust gas-driven, hot water-driven, and direct-fired) could improve boiler efficiency by about 5%, 10%, and 10%, respectively. A gas-fired AHP system was further developed by Lu et al, 12 and the coefficient of performance (COP) is 13% higher than the single-effect absorption system with WHR and 20% higher than the system without WHR.…”

Section: Improvement Strategy For Whr Systemmentioning

confidence: 99%

“…Exergy efficiency has been used to evaluate and optimize systems in many works. 12,[23][24][25][26] Guo et al 27 proposed a novel quantity-entransy, to describe the heat transfer ability. The total entransy is always dissipated in isolated systems, and the entransy dissipation could measure the irreversibility in heat transfer processes.…”

Section: Evaluation Of Heat Transfer and Whr Systemmentioning

confidence: 99%

Analysis of two‐stage waste heat recovery based on natural gas‐fired boiler

et al. 2019

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Summary Waste heat recovery (WHR) is crucial to the efficiency improvement of natural gas‐fired boiler systems. Two‐stage WHR systems based on the natural gas‐fired boiler were analyzed from the viewpoints of thermal efficiency and heat transfer irreversibility. An overall entransy dissipation‐based thermal resistance was derived to evaluate the irreversibility of WHR, including the entransy dissipations during condensation and in absorption heat pump (AHP). Compared with the basic WHR system, the two‐stage WHR systems have higher boiler efficiency and less irreversibility. The air‐humidified system recycles both the heat and vapor in flue gas, while the unutilized latent heat in the recovered vapor causes the boiler to be less efficient than the AHP system. Investigation on heat exchanger effectiveness of two‐stage WHR systems illustrated: in the two‐stage WHR system with air humidification, the increasing effectiveness of both heat exchangers could effectively increase boiler efficiency and reduce heat transfer irreversibility. In the two‐stage WHR system with AHP, boiler efficiency has a local optimum when the dew point occurs near the outlet of the first heat exchanger; increasing the second heat exchanger effectiveness is more efficient in improving boiler efficiency. The present work may provide available references and guidance for the design and optimization of the two‐stage WHR systems.

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“…The pressure of intermediate evaporation and absorption processes could be adjusted to enhance the adaptability in cold regions. The simulated results showed that the energy saving potential of the system could be 39.6% and payback period was 2.5 compared with conventional AHP and gas-fired boiler [9].…”

Section: Introductionmentioning

confidence: 99%

Thermo-economic analysis of composite district heating substation with absorption heat pump

Wang

You

et al. 2020

Applied Thermal Engineering

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A novel composite district heating substation (CDHS) with absorption heat pump was proposed and analyzed in this paper. The CDHS was composed of a water-LiBr absorption heat pump and two plate heat exchanges, which could improve the utilization efficiency of geothermal water and the primary supply water of the primary district heating network. The effect of geothermal water temperature and mass flow rate, and primary supply water mass flow rate variation on system performance were investigated and analyzed by case study. The objective was to maximize net profit and minimize payback period by the cascade utilization of the geothermal water and primary supply water. In addition, economic analysis and multi-objective optimization were conducted to find the optimal mass flow rate of the primary supply water based on the TOPSIS decision making method.Exergy loss analysis was applied under the optimal condition to discover which components had the largest exergy loss. Results indicated that, the proposed system had a net profit of 16.22M$ in the life time and the minimum payback period was 2.2 years at the optimal primary supply water mass flow rate of 46.16kg/s where the COP and exergy efficiency of the system were 1.85 and 59.81%, respectively.

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Thermodynamic and economic analysis of a gas-fired absorption heat pump for district heating with cascade recovery of flue gas waste heat

Cited by 29 publications

References 32 publications

Experimental Studies on Combustion Characteristics of Oil-Palm Biomass in Fluidized-Bed: A Heat Energy Alternative

Experimental Studies on Combustion Characteristics of Oil-Palm Biomass in Fluidized-Bed: A Heat Energy Alternative

Analysis of two‐stage waste heat recovery based on natural gas‐fired boiler

Thermo-economic analysis of composite district heating substation with absorption heat pump

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