耦合碳捕集系统的燃气蒸汽联合循环综合性能研究

doi:10.12096/j.2096-4528.pgt.22077

摘要/Abstract

摘要：

燃气蒸汽联合循环(natural gas combined cycle，NGCC)具有清洁、高效、部分变负荷能力强等特点，将NGCC机组与碳捕集系统耦合是实现碳减排的重要途径之一。以国际能源署(International Energy Agency，IEA)报告中的884 MW二拖一燃气蒸汽联合循环机组为参考对象，利用Ebsilon软件对其进行建模验证。基于能量梯级利用原则，提出了4个不同的NGCC机组与碳捕集系统耦合方案，分别是抽汽回除氧器、抽汽换热回除氧器，抽汽回凝汽器以及增设小汽机加回热回除氧器。并进一步分析了4种不同耦合方案的热力性能，其能量惩罚分别为6.67%、6.59%、6.81%和5.46%，得出方案4能有效降低能量惩罚。

关键词: 燃气蒸汽联合循环(NGCC), 碳捕集, 能量惩罚

Abstract:

Natural gas combined cycle (NGCC) has the characteristics of clean, high efficiency and strong variable load capacity under certain load range. The integration of NGCC unit with carbon capture system is an important way to achieve carbon emission reduction. A 884 MW natural gas combined cycle which consists of two gas turbines, each of which is equipped with a heat recovery steam generator in International Energy Agency (IEA) report was taken as the reference system, and the system was modeled and verified by Ebsilon software. Based on the principle of energy cascade utilization, the following four different integration schemes of NGCC unit with carbon capture system were proposed. Steam extraction from the IP/LP crossover and the condensate is returned to the deaerator, steam extraction from the IP/LP crossover and the condensate after heat exchange is returned to the deaerator, steam extraction from the IP/LP crossover and the condensate is returned to the condenser, steam extraction from the IP/LP crossover and addition of a new turbine while the condensate after heat exchange is returned to the deaerator. The thermodynamic performance of four different integration schemes is further analyzed, and the energy penalty is 6.67%, 6.59%, 6.81% and 5.46%, respectively. It can be seen that the proposed scheme 4 can effectively reduce the energy penalty.

Key words: natural gas combined cycle (NGCC), carbon capture, energy penalty

中图分类号:

TK 09

冯凌杰, 翟融融, 郭一村, 马宁, 傅佳欣. 耦合碳捕集系统的燃气蒸汽联合循环综合性能研究[J]. 发电技术, 2022, 43(4): 584-592.

Lingjie FENG, Rongrong ZHAI, Yicun GUO, Ning MA, Jiaxin FU. Study on the Comprehensive Performance of Natural Gas Combined Cycle Plant Integrated With Carbon Capture System[J]. Power Generation Technology, 2022, 43(4): 584-592.

图/表 12

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天然气成分	体积分数/%
甲烷	89
乙烷	7
丙烷	1
丁烷	0.1
戊烷	0.01
二氧化碳	2
氮气	0.89

天然气成分	体积分数/%
甲烷	89
乙烷	7
丙烷	1
丁烷	0.1
戊烷	0.01
二氧化碳	2
氮气	0.89

参数	数值
再沸器能耗/(MJ/kg CO₂)	3.56
再沸器入口温度/℃	156
再沸器出口温度/℃	133
抽汽温度/℃	311
抽汽流量/(kg/s)	126
捕集率/%	90

参数	数值
再沸器能耗/(MJ/kg CO₂)	3.56
再沸器入口温度/℃	156
再沸器出口温度/℃	133
抽汽温度/℃	311
抽汽流量/(kg/s)	126
捕集率/%	90

参数		参考值	模拟值
联合循环参数	热输入功率/MW	1 504.49	1 504.8
	净功率/MW	874	872.90
	总功率/MW	883.85	883.13
	净效率/%	58.09	57.96
	总效率/%	58.75	58.64
	压缩机压比	34	34
	燃气轮机排气温度/℃	619	619
	主蒸汽温度/℃	585	585
	主蒸汽压力/MPa	15.9	15.9
	再热温度/℃	585	585
	再热压力/MPa	4	4
	凝汽器压力/kPa	4.5	4.5
下游烟气参数	流量/(kg/s)	1 321.79	1 319.76
	压力/kPa	101.8	101.8
	温度/℃	85.2	85.2
	CO₂体积分数/%	4.2	4.2
	H₂O体积分数/%	8.7	8.5
	N₂体积分数/%	74.3	74.4
	O₂体积分数/%	11.9	12.0
	Ar，NO _x 体积分数/%	0.9	0.9