Thermodynamic Performance Study of an Ammonia-Fueled Microturbine Based on Chemical Recuperation

doi:10.16183/j.cnki.jsjtu.2024.108

Abstract

Abstract:

This paper develops an ammonia-fueled micro gas turbine cycle based on chemical recuperation. Using energy and exergy analysis methods, it evaluates the overall thermodynamic performance of the cycle, analyzes the reasons for efficiency improvement, and studies the impact of key parameters. The results show that within the parameter range of combustion chamber outlet temperatures of 750—1 050 ℃ and pressure ratios of 3—8, the efficiency of the ammonia-fueled chemical recuperation micro gas turbine cycle can reach 28.8%—41.7%, which is about 1.87—5.61 percentage points higher than that of a methane-fueled micro gas turbine recuperation cycle. The integration of microturbine with chemical recuperation significantly improves efficiency and specific work. The ammonia thermal chemical recuperation system can recover 36%—43% of the exhaust exergy, with the chemical recuperation reactor accounting for more than half of this recovery. The exergy recovery in the chemical recuperator is the fundamental reason for the increased cycle efficiency. The micro gas turbine exhaust can increase the molar ratio of H₂ in the ammonia decomposition gas to above 35%, with a maximum of up to 68%, thereby effectively improving the fuel combustion characteristics. For every 10 ℃ increase in the chemical recuperation reaction equilibrium temperature difference, the cycle efficiency decreases by about 0.2 percentage points, thus efficient ammonia decomposition in the thermal chemical recuperation reactor is crucial.

Key words: ammonia, chemical-recuperated, microturbine, thermodynamic performance

CLC Number:

TK471

ZHANG Shijie, CHANG Yourun, WANG Aiti. Thermodynamic Performance Study of an Ammonia-Fueled Microturbine Based on Chemical Recuperation[J]. Journal of Shanghai Jiao Tong University, 2026, 60(2): 311-318.

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参数	厂家数据^[24]	计算结果	相对误差/%
效率/%	33.0	33.0	0.00
功率/kW	200.0	200.0	0.00
出口温度/K	553.2	553.6	0.07
排气流率/(kg·s^-1)	1.30	1.29	0.77

部件	参数	取值
压气机	等熵效率/%	80
	压比	3~8
燃烧室	出口温度/℃	650~1 050
	燃烧效率/%	99.5
	压损系数/%	4
	甲烷压缩机效率/%	80
	甲烷喷入压差/kPa	100
透平	等熵效率/%	84
回热器	有效度	0.85
	热侧压损系数/%	3.5
	冷侧压损系数/%	3.5
化学回热器	热侧压损系数/%	1
	燃料出口处节点温差/℃	30
氨气加热器	有效度	0.85
	热侧压损系数/%	1
液氨蒸发器	热侧压损系数/%	1
系统	传动及发电机损失系数/%	2