Research on operation optimization of a 10 000 t/a carbon capture project for coal-fired power plants

doi:10.3969/j.issn.1674-1951.2021.06.009

Abstract

Abstract:

In order to test the application result of carbon capture,utilization and storage（CCUS） technology in coal-fired boilers,a 10 000 t/a carbon capture demonstration project was designed and built for a power plant.A technical path including organic amine absorption,compression and refinery is selected through comparison,and its process and main equipment selection are discussed.After long-term operation test since the start-up of the demonstration project,the influences of absorbent flow,flue gas flow and regenerate temperature on capture efficiency,capture capacity,steam consumption and electricity consumption of the carbon capture system have been studied.The optimum operational parameters are obtained from the analysis on the influence factors,which are the flue gas flow kept at 6 000~7 000 m³/h,the absorbent circulation flow kept at 3 400~3 700 kg/h and the regeneration temperature maintained at 108.5~109.0 ℃.Keeping the parameters within the optimum ranges above,the system is of a capture efficiency higher than 90%,a carbon capture capacity above 1.39 t/h,an average electricity consumption of 312 （kW·h）/t CO₂ and an average regeneration heat rate of 3.05 GJ/t CO₂.The energy consumption of the system is about 23% lower than that of the traditional capture system taking 30% MEA.Finally,the operation cost and its composition are calculated.The study offers solid data for the design and equipment selection of similar carbon capture projects.

Key words: carbon dioxide, carbon capture, CCUS, organic amine, operational optimization, carbon peak, carbon neutrality

CLC Number:

TM732：TK284.9

SUN Luchang, WANG Zhengrong, WU Chong, WANG Kailiang, ZHANG Shiming, HAN Wenquan. Research on operation optimization of a 10 000 t/a carbon capture project for coal-fired power plants[J]. Huadian Technology, 2021, 43(6): 69-78.

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组分名称	单位	设计工况	校核工况
组分名称	单位	设计煤种BMCR	设计煤种50%THA
φ（CO₂）	%	13.38	10.40
φ（O₂）	%	3.84	7.20
φ（N₂）	%	69.75	69.10
φ（H₂O）	%	13.02	13.30
ρ（SO₂）	mg/m³	26	35
ρ（SO₃）	mg/m³	10	10
ρ（NO_x）	mg/m³	50	50
烟尘质量浓度	mg/m³	5	5

名称	单位	设计要求	性能试验结果
CO₂生产能力	t/h	≥1.39	1.39
碳捕集效率	%	≥90.00	97.24
CO₂体积分数	%	≥99.90	99.98
产品质量其他指标		满足食品级二氧化碳国家标准	均优于食品级二氧化碳国家标准
电耗量	kW	520.00	431.32
蒸汽耗量	t/h	2.25	2.14

项目	消耗指标	单价	年运行费用/万元	占比/%
蒸汽	2.14 t/h	78.00 元/t	133.54	35.23
电	431.3 kW	0.27 元/(kW·h)	93.16	24.58
循环水	250 t/h	0.20 元/t	40.00	10.55
吸收剂	1.2 kg/t CO₂	4.00 万元/t	48.00	12.67
碱	0.1 kg/t CO₂	0.30 万元/t	0.30	0.08
人工	8	8.00 万元/(人·a)	64.00	16.89
小计			379.00	100.00