Key parameters and energy consumption analysis of amine decarburization regeneration system with MVR for coal-fired flue gas

doi:10.16085/j.issn.1000-6613.2019-1417

Abstract

Abstract:

For the problem of high energy consumption for regeneration of post-combustion amine decarburization process, an amine decarburization regeneration system with MVR (mechanical vapor recompression）was established through integrating MVR technology into the ammonia regeneration process. Taking the regenerative energy consumption as the objective function, the key parameters affecting the energy consumption were investigated based on a rate-based non-equilibrium model, and their influence law on the regeneration system were analyzed. Results showed that MVR technology shows good energy saving effect in this regeneration system, but the energy-saving efficiency should be lower than 41.3%. With the increasing of the rich liquid loading in the range of 0.35—0.55mol/mol and raising the feed temperature from 90℃ to 115℃, the energy consumption of regeneration were reduced quickly. Although increasing the pressure of the regeneration tower contribute to reduce the regenerative energy consumption, it was more suitable to control the pressure below 2atm. Reducing the pressure of the flash tower, the compressor duty was constantly increased, the reboiler duty was reduced quickly. The reasonable range of flash pressure is 0.9—1.0 atm. Reducing condenser temperature from 70℃ to 20℃ slightly increase regeneration energy consumption and improve CO₂ purity.

Key words: coal-fired flue gas, regeneration energy consumption, mechanical vapor recompression, heat duty, carbon dioxide

摘要：

针对燃烧后胺法脱碳工艺再生能耗高的问题，本文将机械蒸汽再压缩（mechanical vapor recompression，MVR）节能技术与胺法再生工艺集成，建立燃煤烟气胺法脱碳MVR再生系统。采用速率基非平衡模型，以再生能耗为目标函数，对影响再生系统能耗的关键工艺参数进行考察，分析其对MVR再生系统的影响规律。结果表明，MVR技术在燃煤烟气胺法脱碳再生系统中表现出良好的节能效果，但最终节能效率应低于41.3%；在0.35～0.55mol/mol范围内增加富液CO₂担载量以及从90℃到115℃提升进塔温度，再生能耗快速降低；增加再生塔压力，MVR再生系统的再生能耗亦呈下降趋势，再生塔压力控制在2atm以下较为合适；降低闪蒸压力，压缩机能耗不断增加，再沸器能耗快速降低，闪蒸压力的合理取值区间为0.9～1.0atm；降低塔顶冷凝器温度从70℃到20℃，再生能耗略微增加，CO₂气体纯度提高。

关键词: 燃煤烟气, 再生能耗, 机械蒸汽再压缩, 热负荷, 二氧化碳

CLC Number:

TQ 110.9

Hongtao ZHAO, Shumin WANG. Key parameters and energy consumption analysis of amine decarburization regeneration system with MVR for coal-fired flue gas[J]. Chemical Industry and Engineering Progress, 2020, 39(S1): 256-262.

赵红涛, 王树民. 燃煤烟气胺法脱碳MVR再生系统关键参数及能耗分析[J]. 化工进展, 2020, 39(S1): 256-262.

Figures/Tables 9

N₂	O₂	CO₂	H₂O	SO₂	NO_x	烟尘	温度	表压
70.7%	6.1%	11.1%	12.1%	35mg·m^-3	50mg·m^-3	＜10mg·m^-3	40～50℃	-0.14kPa

序号	类型	反应方程式
1	equilibrium	$M E A H + + H 2 O ? M E A + H 3 O +$
2	equilibrium	$2 H 2 O ? H 3 O + + O H -$
3	equilibrium	$H C O 3 - + H 2 O ? C O 3 2 - + H 3 O +$
4	kinetic	$C O 2 + O H - → H C O 3 -$
5	kinetic	$H C O 3 - → C O 2 + O H -$
6	kinetic	$M E A + C O 2 + H 2 O → M E A C O O - + H 3 O +$
7	kinetic	$M E A C O O - + H 3 O + → M E A + C O 2 + H 2 O$

序号	类型	反应方程式
1	equilibrium	$M E A H + + H 2 O ? M E A + H 3 O +$
2	equilibrium	$2 H 2 O ? H 3 O + + O H -$
3	equilibrium	$H C O 3 - + H 2 O ? C O 3 2 - + H 3 O +$
4	kinetic	$C O 2 + O H - → H C O 3 -$
5	kinetic	$H C O 3 - → C O 2 + O H -$
6	kinetic	$M E A + C O 2 + H 2 O → M E A C O O - + H 3 O +$
7	kinetic	$M E A C O O - + H 3 O + → M E A + C O 2 + H 2 O$

序号	设备名称	单元模型	操作条件
1	换热器	Heater	90～115℃
2	再生塔	RadFrac	理论塔板20层操作压力1.6～4.0atm 填料Mellapak 250Y
3	闪蒸罐	Flash2	0.8～1.7atm，绝热
4	压缩机	Compr	操作压力1.6～4.0atm 等熵效率1.0

References 26

1	HEMMATI A, RASHIDI H. Optimization of industrial intercooled post-combustion CO₂ absorber by applying rate-base model and response surface methodology (RSM)[J]. Process Safety and Environmental Protection, 2019, 121: 77-86.
2	BAO W, ZHAO H, LI H, et al. Process simulation of mineral carbonation of phosphogypsum with ammonia under increased CO₂ pressure[J]. Journal of CO₂ Utilization, 2017, 17: 125-136.
3	ROLFE A, HUANG Y, HAAF M, et al. Integration of the calcium carbonate looping process into an existing pulverized coal-fired power plant for CO₂ capture: techno-economic and environmental evaluation[J]. Applied Energy, 2018, 222: 169-179.
4	何卉, 方梦祥, 王涛, 等. 燃煤烟气化学吸收碳捕集系统分析与优化[J]. 化工进展, 2018, 37(6): 2406-2412.
	HE H, FANG M X, WANG T, et al. Analysis and optimization of post-combustion CO₂ capture system based on chemical absorption[J]. Chemical Industry and Engineering Progress, 2018, 37(6): 2406-2412.
5	WANG S, YAN S, MA X, et al. Recent advances in capture of carbon dioxide using alkali-metal-based oxides[J]. Energy & Environmental Science, 2011, 4(10): 3805-3819.
6	李小飞, 王淑娟, 陈昌和. 胺法脱碳系统再生能耗[J]. 化工学报, 2013, 64(9): 3348-3355.
	LI X F, WANG S J, CHEN C H. Heat requirement for regeneration of a CO₂ capture system using amine solutions[J]. CIESC Journal, 2013, 64(9): 3348-3355.
7	陆诗建, 高丽娟, 陆胤君, 等. 胺法捕集烟气中CO₂热能综合利用研究[J]. 计算机与应用化学, 2018, 35(10): 843-854.
	LU S J, GAO L J, LU Y J, et al. Comprehensive utilization of heat energy in CO₂ capture process by MEA method[J]. Computers and Applied Chemistry, 2018, 35(10): 843-854.
8	SI Z, HAN D, SONG Y, et al. Experimental investigation on a combined system of vacuum membrane distillation and mechanical vapor recompression[J]. Chemical Engineering and Processing： Process Intensification, 2019, 139: 172-182.
9	YANG J, ZHANG C, ZHANG Z, et al. Electroplating wastewater concentration system utilizing mechanical vapor recompression[J]. Journal of Environmental Engineering, 2018, 144(7): 04018053.
10	董文虎, 孙玉堂, 陈光强, 等. MVR蒸发系统在淡盐水浓缩中的应用[J]. 氯碱工业, 2017, 53(1): 37-39.
	DONG W H, SUN Y T, CHEN G Q, et al. Application of MVR evaporation system in concentration of depleted brine[J]. Chlor-Alkali Industry, 2017, 53(1): 37-39.
11	越云凯, 吴小华, 张振涛. MVR海水淡化系统运行特性分析与优化[J]. 工程热物理学报, 2018(9): 16.
	YUE Y K, WU X H, ZHANG Z T. Operation characteristic analysis and optimization MVR seawaterer desaliation system[J]. Journal of Engineering Thermophysics, 2018(9): 16.
12	杨德明, 印一凡, 王争光, 等. 蒸发耦合精馏处理含盐甲醇废水的MVR节能工艺[J]. 化学工程, 2019(8): 16.
	YANG D M, YIN Y F, WANG Z G, et al. MVR energy-saving technology for treatment of methanol wastewater containing salt based on evaporation coupling distillation[J]. Chemical Engineering (China), 2019(8): 16.
13	王帅, 张军. 机械蒸发再压缩(MVR)技术进展研究[J]. 节能, 2017, 36(11): 4-6.
	WANG S, ZHANG J. Research progress of mechanical vapor recompression (MVR) technology[J]. Energy Conservation, 2017, 36(11): 4-6.
14	NAYAR K G, FERNANDES J, MCGOVERN R K, et al. Cost and energy needs of RO-ED-crystallizer systems for zero brine discharge seawater desalination[J]. Desalination, 2019, 457: 115-132.
15	LU S J, ZHAO D Y, ZHU Q M. CO₂ absorber coupled with double pump CO₂ capture technology for coal-fired flue gas[J]. Energy Procedia, 2018, 154: 163-170.
16	VOU-HARBOU I, IMLE M, HASSE H. Modeling and simulation of reactive absorption of CO₂ with MEA: results for four different packings on two different scales[J]. Chemical Engineering Science, 2014, 105: 179-190.
17	FLØ N E, FARAMARZI L, IVERSEN F, et al. Assessment of material selection for the CO₂ absorption process with aqueous MEA solution based on results from corrosion monitoring at Technology Centre Mongstad[J]. International Journal of Greenhouse Gas Control, 2019, 84: 91-110.
18	WANG T, HE H, YU W, et al. Process simulations of CO₂ desorption in the interaction between the novel direct steam stripping process and solvents[J]. Energy & Fuels, 2017, 31(4): 4255-4262.
19	ZHANG M K, GUO Y C. Performance simulations of MEA and NH₃ basedlarge-scale CO₂ capture in packed columns under different flue gas parameters[J]. Korean Journal of Chemical Engineering, 2015, 32(8): 1477-1485.
20	SHARIFZADEH M, SHAH N. MEA-based CO₂ capture integrated with natural gas combined cycle or pulverized coal power plants: operability and controllability through integrated design and control[J]. Journal of Cleaner Production, 2019, 207: 271-283.
21	LIU J. Investigation of energy-saving designs for an aqueous ammonia-based carbon capture process[J]. Industrial & Engineering Chemistry Research, 2018, 57(45): 15460-15472.
22	何卉. 二氧化碳化学吸收系统的工艺流程改进和集成优化研究[D]. 杭州: 浙江大学, 2018.
	HE H. Study on the modification and integration of CO₂chemical absorption process [D]. Hangzhou: Zhejiang University, 2018.
23	GALINDO P, SCHAFFER A, BRECHTEL K, et al. Experimental research on the performance of CO₂-loaded solutions of MEA and DEA at regeneration conditions[J]. Fuel, 2012, 101: 2-8.
24	陆诗建, 高丽娟, 王家凤, 等. 烟气CO₂捕集热能梯级利用节能工艺耦合优化[J]. 化工进展, 2019, 38(2): 728-737.
	LU S J, GAO L J, WANG J F, et al. Coupling optimization of energy-saving technology for cascade utilization of flue gas CO₂capture system[J]. Chemical Industry and Engineering Progress, 2019, 38(2): 728-737.
25	涂巍巍, 方佳伟, 李竹石, 等. 基于MEA的CO₂相变化吸收剂的开发[J]. 中国科学: 化学, 2018, 48(6): 641-647.
	TU W W, FANG J W, LI Z S, et al. Development of MEA phase change absorbent[J]. Scientia Sinica (Chimica), 2018, 48(6): 641-647.
26	HONG H, LI W, GU C. Performance study on a mechanical vapor compression evaporation system driven by Roots compressor[J]. International Journal of Heat and Mass Transfer, 2018, 125: 343-349.

[1]	ZHENG Qian, GUAN Xiushuai, JIN Shanbiao, ZHANG Changming, ZHANG Xiaochao. Photothermal catalysis synthesis of DMC from CO₂ and methanol over Ce_0.25Zr_0.75O₂ solid solution [J]. Chemical Industry and Engineering Progress, 2023, 42(S1): 319-327.
[2]	SUN Yuyu, CAI Xinlei, TANG Jihai, HUANG Jingjing, HUANG Yiping, LIU Jie. Optimization and energy-saving of a reactive distillation process for the synthesis of methyl methacrylate [J]. Chemical Industry and Engineering Progress, 2023, 42(S1): 56-63.
[3]	YANG Hanyue, KONG Lingzhen, CHEN Jiaqing, SUN Huan, SONG Jiakai, WANG Sicheng, KONG Biao. Decarbonization performance of downflow tubular gas-liquid contactor of microbubble-type [J]. Chemical Industry and Engineering Progress, 2023, 42(S1): 197-204.
[4]	WANG Yaogang, HAN Zishan, GAO Jiachen, WANG Xinyu, LI Siqi, YANG Quanhong, WENG Zhe. Strategies for regulating product selectivity of copper-based catalysts in electrochemical CO₂ reduction [J]. Chemical Industry and Engineering Progress, 2023, 42(8): 4043-4057.
[5]	LIU Yi, FANG Qiang, ZHONG Dazhong, ZHAO Qiang, LI Jinping. Cu facets regulation of Ag/Cu coupled catalysts for electrocatalytic reduction of carbon dioxide [J]. Chemical Industry and Engineering Progress, 2023, 42(8): 4136-4142.
[6]	HUANG Yufei, LI Ziyi, HUANG Yangqiang, JIN Bo, LUO Xiao, LIANG Zhiwu. Research progress on catalysts for photocatalytic CO₂ and CH₄ reforming [J]. Chemical Industry and Engineering Progress, 2023, 42(8): 4247-4263.
[7]	LOU Baohui, WU Xianhao, ZHANG Chi, CHEN Zhen, FENG Xiangdong. Advances in nanofluid for CO₂ absorption and separation [J]. Chemical Industry and Engineering Progress, 2023, 42(7): 3802-3815.
[8]	LYU Chao, ZHANG Xiwen, JIN Lijian, YANG Linjun. Efficient capture of CO₂ by a new biphasic solvent-ionic liquid system [J]. Chemical Industry and Engineering Progress, 2023, 42(6): 3226-3232.
[9]	WANG Keju, ZHAO Cheng, HU Xiaomei, YUN Junge, WEI Ninghan, JIANG Xueying, ZOU Yun, CHEN Zhihang. Research progress of low temperature catalytic oxidation of VOCs by metal oxides [J]. Chemical Industry and Engineering Progress, 2023, 42(5): 2402-2412.
[10]	MA Yuan, XIAO Qingyue, YUE Junrong, CUI Yanbin, LIU Jiao, XU Guangwen. CO _xco-methanation over a Ni-based catalyst supported on CeO₂-Al₂O₃ composite [J]. Chemical Industry and Engineering Progress, 2023, 42(5): 2421-2428.
[11]	HE Zhiyong, GUO Tianfo, WANG Jinli, LYU Feng. Progress of CO₂/epoxide copolymerization catalyst [J]. Chemical Industry and Engineering Progress, 2023, 42(4): 1847-1859.
[12]	FU Le, YANG Yang, XU Wenqing, GENG Zanbu, ZHU Tingyu, HAO Runlong. Research progress in CO₂ capture technology using novel biphasic organic amine absorbent [J]. Chemical Industry and Engineering Progress, 2023, 42(4): 2068-2080.
[13]	CHEN Chongming, ZENG Siming, LUO Xiaona, SONG Guosheng, HAN Zhongge, YU Jinxing, SUN Nannan. Preparation and performance of carbon supported potassium-based CO₂ adsorbent derived from hyper-cross linked polymers [J]. Chemical Industry and Engineering Progress, 2023, 42(3): 1540-1550.
[14]	WANG Qiuhua, WU Jiashuai, ZHANG Weifeng. Research progress of alkaline industrial solid wastes mineralization for carbon dioxide sequestration [J]. Chemical Industry and Engineering Progress, 2023, 42(3): 1572-1582.
[15]	WANG Xiaoyue, ZHANG Weimin, YAO Zhengyang, GUO Xiaohong, LI Congming. Research progress of reverse water gas shift reaction [J]. Chemical Industry and Engineering Progress, 2023, 42(3): 1583-1594.