燃气-蒸汽联合循环发电系统高级㶲经济性分析

doi:10.12096/j.2096-4528.pgt.23123

摘要/Abstract

摘要：

目的基于㶲经济发展而来的高级㶲经济分析方法，能够细化拆分系统组件的经济成本，深入探究经济成本形成的内在原因。方法在结合高级㶲分析的基础上，采用高级㶲经济分析法将燃气-蒸汽联合循环发电系统中各组件的成本拆解为内源性成本、外源性成本、可避免成本和不可避免成本，并对此进行计算。结果在设计工况下，联合循环发电系统中燃烧室的可避免㶲损最大，为28.41 MW，占燃烧室㶲损的26.55%。基于计算结果，对透平提出了不同的改进措施，降低了系统内源性和外源性㶲损。系统中㶲耗散成本占比最大的是内源性可避免部分，底循环改进优先级最高的是高压缸，其次是低压缸。联合循环发电系统中年度化成本外源性占比为80.59%，其中外源性可避免部分占比40.04%。结论研究成果可为系统提供多方面能效评价角度和优化成本的改进方向。

关键词: 发电系统, 燃气-蒸汽联合循环, 高级?经济性分析, 经济成本, 高级?分析

Abstract:

Objectives The advanced exergoeconomics analysis method based on exergetic analysis development can refine the economic costs of splitting system components and deeply explore the underlying reasons for the formation of economic costs. Methods Combining advanced exergetic analysis, advanced exergoeconomics analysis method is used to split the costs of the components in the gas-steam combined cycle power generation system into endogenous, exogenous, avoidable and unavoidable costs, and calculate them. Results Under the design conditions, the avoidable loss in the combustion chamber in the combined cycle power system is the largest, which is 28.41 MW, accounting for 26.55% of the combustion chamber loss. Based on the results of the analysis, different improvement measures are proposed for the turbine to reduce the endogenous and exogenous losses of the system. The largest share of the annualized cost of the system is the endogenous avoidable portion, and the bottom-cycle improvement is prioritized highest for the high-pressure cylinder, followed by the low-pressure cylinder. The exogenous share of annualized costs in the combined cycle power system is 80.59%, of which the exogenous avoidable portion is 40.04%. Conclusions The findings of the study can provide the system with a multifaceted energy efficiency evaluation perspective and an improvement direction to optimize the cost.

Key words: power generation system, gas-steam combined cycle, advanced exergoeconomics analysis, economic cost, advanced exergy analysis

中图分类号:

TK 123

吕嘉伟, 霍兆义, 刘峰, 谢宁, 王文静. 燃气-蒸汽联合循环发电系统高级㶲经济性分析[J]. 发电技术, 2024, 45(5): 941-950.

Jiawei LÜ, Zhaoyi HUO, Feng LIU, Ning XIE, Wenjing WANG. Advanced Exergoeconomics Analysis of Gas-Steam Combined Cycle Power Generation System[J]. Power Generation Technology, 2024, 45(5): 941-950.

图/表 9

图1 燃气-蒸汽联合循环发电系统图①煤压机；②空压机；③燃烧室；④透平；⑤TCA；⑥高压过热器；⑦高压蒸发器；⑧低压过热器；⑨高压省煤器2；⑩低压蒸发器；⑪高压省煤器1；⑫除氧器；⑬汽轮机高压缸；⑭汽轮机低压缸；⑮凝汽器；⑯凝结泵；⑰高压泵；⑱低压泵；⑲发电机；⑳烟囱。

Fig. 1 Diagram of gas-steam combined cycle power generation system

表1 联合循环发电系统主要设计参数

Tab. 1 Main design parameters of combined cycle power generation systems

参数	设计值	模拟值
系统发电量/MW	150.00	150.79
高压蒸汽压力/MPa	5.99	5.99
高压蒸汽温度/℃	510.00	512.00
高压蒸汽质量流量/(kg/s)	45.00	48.74
低压蒸汽压力/MPa	0.93	0.93
低压蒸汽温度/℃	260.00	268.12
低压蒸汽质量流量/(kg/s)	13.00	13.20
燃气轮机排气温度/℃	520.00	525.99
燃气轮机排气质量流量/(kg/s)	450.00	453.10

表2 系统各主要节点的热力参数

Tab. 2 Thermal parameters of main nodes in the system

序号	温度/ ℃	压力/ MPa	质量流量/ (kg·s^-1)	比焓/ (kJ·kg^-1)	熵/ [kJ/(kg·K)]
1	25.00	101.09	127.25	33.83	7.45
2	426.80	1 636.40	127.25	611.60	7.65
3	25.00	101.09	252.02	32.87	8.87
4	122.45	258.49	1.81	355.22	8.97
5	234.51	565.22	15.05	473.68	8.99
6	398.80	1 445.30	58.29	608.15	9.00
7	398.80	1 445.30	176.87	608.15	9.00
8	1 250.60	1 416.40	355.94	1 944.60	9.83
9	398.80	1 445.30	34.37	608.15	9.00
10	671.95	1 445.30	23.93	608.15	9.00
11	200.00	1 445.30	23.93	266.36	8.43
12	525.99	103.35	453.10	725.57	9.87
13	467.22	101.09	453.10	402.35	9.39
14	293.12	101.09	453.10	394.19	9.37
15	288.13	101.09	453.10	356.81	9.31
16	250.81	101.09	453.10	264.31	9.12
17	194.88	101.09	453.10	193.01	8.96
18	146.35	101.09	453.10	157.73	8.87
19	117.32	101.09	453.10	134.36	8.83
20	278.12	5 990.40	48.74	2 782.40	5.87
21	512.88	5 990.40	48.74	3 393.00	6.83
22	268.12	5 990.40	48.74	1 174.00	2.95
23	268.12	930.00	13.20	2 983.10	7.00
24	179.88	930.00	13.20	2 776.20	6.58
25	198.14	5 990.40	48.74	918.39	2.46
26	102.32	930.00	13.20	428.85	1.33
27	102.32	110.00	13.20	428.85	1.33
28	102.32	110.00	48.74	428.85	1.33
29	102.32	5 990.40	48.74	428.85	1.33
30	286.00	930.00	48.74	2 983.70	7.04
31	304.55	4.70	61.94	2 305.70	7.59
32	20.00	101.00	3 097.10	83.95	0.30
33	30.96	101.00	3 097.10	129.31	0.45
34	31.80	4.70	61.94	133.19	0.46
35	31.00	1 420.00	61.94	133.29	0.46
36	80.00	1 420.00	61.94	258.53	0.85

表3 联合循环发电系统各组件高级㶲损

Tab. 3 Advanced exergy for all components of the system

序号	组件	$E ˙ D, k E N$ / MW	$E ˙ D, k E X$ / MW	$E ˙ D, k U N$ / MW	$E ˙ D, k A V$ / MW
1	AC	4.03	5.15	2.16	8.06
2	GC	4.21	1.17	2.02	3.58
3	CC	97.98	7.08	78.59	28.41
4	TU	15.45	6.00	13.43	8.86
5	TCA	0.59	5.53	6.52	1.52
6	Con	2.29	0.35	2.23	0.41
7	HPST	2.49	0.27	1.21	1.64
8	LPST	9.18	0.69	4.35	6.06
9	Hsup	2.57	0.26	2.01	0.82
10	Heva	3.59	2.34	3.95	2.03
11	Lsup	0.14	0.02	0.12	0.05
12	Heco2	0.22	0.14	0.11	0.16
13	Leva	1.82	0.03	1.64	0.63
14	Heco1	0.17	0.18	0.18	0.03
15	Dea	1.28	0.25	1.23	0.19

表3 联合循环发电系统各组件高级㶲损

Tab. 3 Advanced exergy for all components of the system

序号	组件	$E ˙ D, k E N$ / MW	$E ˙ D, k E X$ / MW	$E ˙ D, k U N$ / MW	$E ˙ D, k A V$ / MW
1	AC	4.03	5.15	2.16	8.06
2	GC	4.21	1.17	2.02	3.58
3	CC	97.98	7.08	78.59	28.41
4	TU	15.45	6.00	13.43	8.86
5	TCA	0.59	5.53	6.52	1.52
6	Con	2.29	0.35	2.23	0.41
7	HPST	2.49	0.27	1.21	1.64
8	LPST	9.18	0.69	4.35	6.06
9	Hsup	2.57	0.26	2.01	0.82
10	Heva	3.59	2.34	3.95	2.03
11	Lsup	0.14	0.02	0.12	0.05
12	Heco2	0.22	0.14	0.11	0.16
13	Leva	1.82	0.03	1.64	0.63
14	Heco1	0.17	0.18	0.18	0.03
15	Dea	1.28	0.25	1.23	0.19

图2 联合循环发电系统组件高级㶲损细化

Fig. 2 Advanced loss refinement of system components

图3 联合循环发电系统组件㶲耗散成本细化

Fig. 3 Cost refinement of exergy loss of system component exergy loss

图4 联合循环发电系统㶲耗散成本占比

Fig. 4 Percentage of exergy loss for the system

图5 联合循环发电系统组件年度化成本细化

Fig. 5 Annualized cost breakdown of system components

图6 联合循环发电系统年度化成本占比

Fig. 6 Annualized cost share of the system

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