Temperature Control Scheme for Gas Turbine of Combined Cycles with Exhaust Gas Recirculation

doi:10.16183/j.cnki.jsjtu.2023.126

Abstract

Abstract:

Under partial-load conditions, the combined application of exhaust gas recirculation of heat recovery steam generator and compressor inlet guide vane adjustment (EGR-IGVC) can effectively improve the performance of gas turbine combined cycle. However, if this strategy is combined with the temperature control scheme of constant T3(turbine inlet temperature)-T4_m(maximum allowable turbine exhaust temperature), which is often adopted in gas turbine combined cycles under part-load conditions, it would cause a large bottoming cycle exergy destruction and a significant decrease in bottoming cycle power output at relatively lower loads. In this paper, a constant T3-T4_m-T4_d (the design value of turbine exhaust temperature) scheme suitable for the EGR-IGVC strategy is proposed, the PG9351FA gas turbine combined cycle unit is taken as the research object, and the partial-load performance of combined cycle under the two temperature control schemes is compared and investigated based on energy and exergy analysis. The results show that the combination of the EGR-IGVC strategy with the constant T3-T4_m scheme is still the best at the ambient temperature of 15 ℃ and the partial-load rate of above 80%. At a load of 30%—80%, compared with the constant T3-T4_m scheme, the EGR-IGVC strategy combined with the constant T3-T4_m-T4_d scheme can increase the gas turbine efficiency by 0.15%—0.47%, and decrease the exergy destruction of the heat recovery steam generator by more than 0.51%(2.15 MW). The results also show that adopting the constant T3-T4_m-T4_d scheme can always obtain higher combined cycle efficiency when the ambient temperature varies between 0 and 40 ℃. In addition, the increase in partial-load efficiency becomes more evident with the rise of ambient temperature.

Key words: gas turbine combined cycle, exhaust gas recirculation (EGR), compressor inlet guide vane (IGV), energy and exergy analysis, partial load

CLC Number:

TK472

LI Keying, CHEN Kun, JIANG Zepeng, LI Chao, GUO Xiaoguo, ZHANG Shijie. Temperature Control Scheme for Gas Turbine of Combined Cycles with Exhaust Gas Recirculation[J]. Journal of Shanghai Jiao Tong University, 2024, 58(8): 1156-1166.

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系统	参数	设计值
环境	环境温度/℃	15.00
	环境压力/bar	1.01
	环境相对湿度/%	60.00
燃气轮机	入口空气质量流量/(kg·s^-1)	635.00
	燃料质量流量/(kg·s^-1)	14.74
	透平入口温度/℃	1 328.00
	燃气轮机排气温度/℃	615.00
	燃气轮机做功/MW	253.20
余热锅炉	高压蒸汽温度/℃	565.00
	中压蒸汽温度/℃	297.00
	低压蒸汽温度/℃	295.00
	高压蒸汽压力/bar	98.80
	中压蒸汽压力/bar	24.00
	低压蒸汽压力/bar	4.00
蒸汽轮机	高压入口压力/bar	98.80
	中压入口压力/bar	24.00
	低压入口压力/bar	4.00
	蒸汽轮机做功/MW	139.80
联合循环	联合循环做功/MW	393.00
	联合循环效率/%	56.14

运行策略	方案	控制参数	描述	负荷范围/%
IGVC	等T3-T4_m	Δa, q_m	维持透平入口温度为设计工况值	82.5~100
		Δa, q_m	维持透平排气温度为最大值	82.5~43.7
		q_m	透平入口与排气温度迅速下降	43.7~30
EGR-IGVC	等T3-T4_m	EGRR, q_m	维持透平入口温度为设计工况值	89.1~100
		EGRR, q_m	维持透平排气温度为最大值	81.8~89.1
		Δa, q_m	维持透平排气温度为最大值	36.7~81.8
		q_m	透平入口与排气温度迅速下降	30~36.7
	等T3-T4_m-T4_d	EGRR, q_m	维持透平入口温度为设计工况值	89.1~100
		EGRR, q_m	维持透平排气温度为最大值	81.8~89.1
		q_m	透平入口与排气温度逐渐下降	75.7~81.8
		Δa, q_m	维持透平排气温度为设计工况值	33.0~75.7
		q_m	透平入口与排气温度迅速下降	30~33.0

项目	策略	方案	压比	燃气轮机做功/MW	燃气轮机效率/%
90%负荷	IGVC	等T3-T4_m	14.08	226.09	35.05
	EGR-IGVC	等T3-T4_m	13.88	223.25	35.01
		等T3-T4_m-T4_d
80%负荷	IGVC	等T3-T4_m	12.81	193.22	33.05
	EGR-IGVC	等T3-T4_m	12.75	191.77	33.45
		等T3-T4_m-T4_d	12.95	192.56	33.82
70%负荷	IGVC	等T3-T4_m	11.71	163.95	31.28
	EGR-IGVC	等T3-T4_m	11.54	164.55	31.88
		等T3-T4_m-T4_d	12.02	166.62	32.34
60%负荷	IGVC	等T3-T4_m	10.55	135.61	29.26
	EGR-IGVC	等T3-T4_m	10.39	137.04	30.00
		等T3-T4_m-T4_d	10.82	138.87	30.47
50%负荷	IGVC	等T3-T4_m	9.31	107.73	26.92
	EGR-IGVC	等T3-T4_m	9.13	110.36	27.94
		等T3-T4_m-T4_d	9.51	111.63	28.33
40%负荷	IGVC	等T3-T4_m	8.29	82.61	24.58
	EGR-IGVC	等T3-T4_m	7.75	84.36	25.53
		等T3-T4_m-T4_d	8.11	85.59	25.90
30%负荷	IGVC	等T3-T4_m	7.88	61.36	22.13
	EGR-IGVC	等T3-T4_m	6.96	61.37	23.08
		等T3-T4_m-T4_d	6.98	62.52	23.23