Application of MEA solution in the CO2 capture in biomass power plants and coal-fired power plants

doi:10.3969/j.issn.2097-0706.2022.06.009

Abstract

Abstract:

To make a commitment on limiting temperature rise to 1.5 ℃, it is necessary to reduce the fossil fuel consumptions and greenhouse gas emissions. The bioenergy with carbon capture and storage （BECCS） technology has received extensive attention. A model of monoethanolamine（MEA）-based chemical absorption CO₂ capture systems is developed. By comparing the performances of carbon capture systems in the biomass power plants taking wood,herb biomass and municipal solid waste as fuels and the coal-fired power plants taking bituminous and lignite as fuels,it is found that their flue gas composition are varied, and the CO₂ capture rate, energy consumption and economic benefits of installing CO₂ capture systems are different. The simulation results show that the CO₂ volume fractions in biomass-combusted flue gas（bio-FG） whose components are varied with the types of fuels are more widely distributed than that in coal-fired flue gas. With the same lean MEA solution, the capture system's CO₂ capture rate of bio-FG, except herbal biomass,reaches 63.73%-92.08%.It is higher than that of coal-fired flue gas which is 59.24%-79.53%. Except municipal solid waste's flue, the reboiler energy penalty and condenser energy penalty of bio-FG are 3.89-4.00 GJ/t and 1.57-1.71 GJ/t,respectively.They are lower than that of coal-fired flue gas which are 3.90-4.29 GJ/t and 1.61-1.97 GJ/t,respectively. Bio-FG leads to a slower oxidative degradation of MEA. On the premise of consistent and sufficient heat supply, the economic benefit brought by the installation of a CO₂ capture system to a coal fired power plant is larger than that to a biomass power plant, however, the overall economic benefit of the biomass power plant is higher.

Key words: carbon neutrality, carbon capture, biomass, reboiler energy penalty, economic benefit, MEA

CLC Number:

TK284.9：TM732

HU Changzheng, WANG Yabo, LIU Shengchun. Application of MEA solution in the CO2 capture in biomass power plants and coal-fired power plants[J]. Integrated Intelligent Energy, 2022, 44(6): 78-85.

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参数		输入值
MEA溶液 (质量分数30%)	贫液流量/(kg·h^-1)	200
MEA溶液 (质量分数30%)	贫液温度/K	313.00
吸收塔	填料高度/m	4.20
	塔直径/mm	125
	填料	Sulzer Mellapak 250Y
	塔底压力/kPa	101
解吸塔	填料高度/m	2.52
	塔径/mm	125
	填料	Sulzer Mellapak 250Y
	冷凝器温度/K	291.45
	冷凝器压力/kPa	200

参数		试验1	试验2
试验条件	燃料	天然气	煤
	烟气流量/(kg·h^-1)	72.0	72.4
	烟气压力/kPa	100.5	101.0
	温度/K	321	321
烟气组成	ω（N₂）/%	74.3	67.2
	ω（O₂）/%	10.1	9.4
	ω（H₂O）/%	7.1	6.9
	ω（CO₂）/%	8.5	16.5
贫液负载率/(mol·mol^-1)		0.386	0.308

项目		试验1	试验2
CO₂去除率	试验值/%	75.9	51.3
	模拟值/%	77.6	52.0
	误差/%	2.2	1.4
CO₂捕集率	试验值/%	76.0	51.2
	模拟值/%	77.2	52.0
	误差/%	1.6	1.6
CO₂质量分数	试验值/%	99.6	99.6
	模拟值/%	99.5	99.5
	误差/%	0.1	0.1
再沸器负荷	试验值//kW	6.5	6.8
	模拟值//kW	6.7	6.5
	误差/%	3.1	4.4
再沸器单位能耗	试验值/(GJ·t^-1)	5.0	4.0
	模拟值/(GJ·t^-1)	5.1	3.8
	误差/%	2.0	5.0

烟气组成	生物质			煤
烟气组成	WD^[9]	MSW^[21]	HB^[22]	烟煤^[23]	褐煤^[24]
φ（CO₂）	12.68	7.04	14.07	10.00	14.00
φ（O₂）	7.13	9.03	4.52	9.00	3.00
φ（H₂O）	14.88	18.75	10.49	3.00	14.70
φ（N₂）	65.31	65.18	70.92	78.00	68.30

参数	原料		文献
参数	煤	WD	文献
燃料流量/(t·h^-1)	256.7	358.6	[11]
烟气流量/(t·h^-1)	2 995.2	2 890.8
CO₂体积分数/%	13.28	14.35
CO₂捕集量/(t·h^-1)	547.2	565.6
电价/[元·（kW·h^-1）]	0.33	0.75	[32]
燃料价格/（元·t^-1）	900.0	300.0	[32,34]
欧盟碳交易价格/(元·t^-1)	554.9		[35]