Analysis of Influence of Coal-Ammonia Co-firing on the Heat Transfer Characteristics of Heating Surfaces in Coal-Fired Boiler

doi:10.12096/j.2096-4528.pgt.23160

Abstract

Abstract:

Objectives Ammonia co-firing is an effective way to reduce carbon emission from coal-fired boiler. However, there are few studies on the analysis of ammonia co-firing from the perspective of the entire furnace scale. Therefore, the heat transfer behavior under different loads are systematically analyzed. Methods Combined with numerical simulation and boiler thermodynamic calculation, the influence of ammonia co-firing on the heat transfer of furnace and convection heating surface of a 600 MW subcritical coal-fired boiler under different loads of 50%- 100% is investigated. The variation characteristics of working fluid temperature, flue gas temperature and boiler efficiency with varying ammonia co-firing ratios (0-40% calorific value ratio) are analyzed. Results The furnace outlet flue gas temperature tends to decrease with increasing ammonia co-firing ratio. By adjusting the attemperation water of boiler, the outlet temperature of the working fluid on each heating surface remains stable when co-firing 0-40% ammonia. Additionally, the temperature of primary and secondary hot air at the air preheater outlet slightly decreases with a higher proportion of ammonia. Compared with pure coal combustion, the exhaust gas temperature of the boiler increases by 7.8-8.1 ℃at 20%-40% ammonia co-firing ratio, leading to a decrease of boiler efficiency by 0.9%-1.1%. Conclusions Appropriately adjusting the parameters, stable boiler operation can be maintained with an ammonia co-firing ratio below 50%.The findings provide a theoretical basis and practical guidance for the application of coal-ammonia co-combustion technology.

Key words: coal-fired power generation, coal-fired boiler, ammonia co-firing, numerical simulation, heat transfer characteristic, thermodynamic calculation

CLC Number:

TK 225

Yiwei XU, Yan HONG, Xiaopeng ZHAO, Bingwei SUI. Analysis of Influence of Coal-Ammonia Co-firing on the Heat Transfer Characteristics of Heating Surfaces in Coal-Fired Boiler[J]. Power Generation Technology, 2025, 46(5): 1022-1031.

Figures/Tables 17

References 37

[1]	郑国光．支撑“双碳”目标实现的问题辨识与关键举措研究[J]．中国电力，2023，56(11)：1-8．
	ZHENG G G ．Problem identification and key measures to support the achievement of carbon peak and carbon neutrality[J]．Electric Power，2023，56(11)：1-8．
[2]	巫俊楫，张惠娟，宗涛，等．浅析我国实现“双碳”目标的挑战与路径举措[J]．低碳世界，2023，13(11)：31-33．
	WU J J， ZHANG H J， ZONG T，et al ．Analysis on the challenges and measures to achieve the “double carbon” goal in China[J]．Low Carbon World，2023，13(11)：31-33．
[3]	赵欣．“双碳”背景下国外能源生产消费现状对我国能源安全保障的启示[J]．中国煤炭地质，2022，34(11)：35-40．
	ZHAO X ．Enlightenment of foreign energy production and consumption status quo on China’s energy security under the background of “carbon peaking and carbon neutrality”[J]．Coal Geology of China，2022，34(11)：35-40．
[4]	张永生，董舵，肖逸，等．我国能源生产、消费、储能现状及碳中和条件下变化趋势[J]．科学通报，2021，66(34)：4466-4476． doi:10.1360/tb-2021-0797
	ZHANG Y S， DONG D， XIAO Y，et al ．Current status and trends in energy production，consumption，and storage under carbon neutrality conditions in China[J]．Chinese Science Bulletin，2021，66(34)：4466-4476． doi:10.1360/tb-2021-0797
[5]	袁鑫，刘骏，陈衡，等．“双碳”背景下火电行业CCUS技术路线分析[J]．能源科技，2023(4)：46-50．
	YUAN X， LIU J， CHEN H，et al ．Analysis of CCUS Technology Route in the Thermal Power Industry under the background of “carbon peak and carbon neutrality”[J]．Energy Science and Technology，2023(4)：46-50．
[6]	许洪华，邵桂萍，鄂春良，等．我国未来能源系统及能源转型现实路径研究[J]．发电技术，2023，44(4)：484-491． doi:10.12096/j.2096-4528.pgt.23002
	XU H H， SHAO G P， E C L，et al ．Research on China’s future energy system and the realistic path of energy transformation[J]．Power Generation Technology，2023，44(4)：484-491． doi:10.12096/j.2096-4528.pgt.23002
[7]	农发行农村金融发展研究院课题组，程覃思．系统观下的能源清洁低碳转型与农发行支持路径[J]．农业发展与金融，2022(4)：13-21．
	Research Group of Rural Financial Development Institute of Agricultural Development Bank， CHENG Q S ．Energy clean and low-carbon transformation and agricultural development bank support path from the system view[J]．Agricultural Development and Finance，2022(4)：13-21．
[8]	赵春生，杨君君，王婧，等．燃煤发电行业低碳发展路径研究[J]．发电技术，2021，42(5)：547-553． doi:10.12096/j.2096-4528.pgt.21054
	ZHAO C S， YANG J J， WANG J，et al ．Research on low-carbon development path of coal-fired power industry[J]．Power Generation Technology，2021，42(5)：547-553． doi:10.12096/j.2096-4528.pgt.21054
[9]	张蕾，邢大勇，芦玉铎，等．新型吸收剂捕集燃气电厂烟气中二氧化碳的中试研究[J]．分布式能源，2023，8(4)：55-62．
	ZHANG L， XING D Y， LU Y D，et al ．Pilot study on a new absorbent captures carbon dioxide in flue gas of gas-fired power plant[J]．Distributed Energy，2023，8(4)：55-62．
[10]	刘志强，李建锋，潘荔，等．中国煤电机组改造升级效果分析与展望[J]．中国电力，2024，57(7)：1-11.．
	LIU Z Q， LI J F， PAN L，et al ．Analysis and prospect of transformation and upgrading effects of coal-fired power units in China[J]．Electric Power，2024，57(7)：1-11．
[11]	史鹏飞，康朝斌，张志强，等．某330 MW亚临界直接空冷燃煤机组汽轮机综合节能改造效果分析[J]．电力科技与环保，2023，39(1)：8-15．
	SHI P F， KANG C B， ZHANG Z Q，et al ．Comprehensive energy saving retrofit technology and application of a 330 MW subcritical direct air-cooled coal-fired unit[J]．Electric Power Technology and Environmental Protection，2023，39(1)：8-15．
[12]	朱磊，刘成勇，古文哲，等．双碳目标下“煤基固废-CO₂”协同充填封存技术构想[J]．矿业安全与环保，2023，50(6)：16-21．
	ZHU L， LIU C Y， GU W Z，et al ．Conception of“coal-based solid waste-CO₂” cooperative filling and storage technology under the target of carbon peak and carbon neutral[J]．Mining Safety & Environmental Protection，2023，50(6)：16-21．
[13]	ZHANG H， JIANG X， LIU J，et al ．Application of density functional theory to the nitric oxide heterogeneous reduction mechanism in the presence of hydroxyl and carbonyl groups[J]．Energy Conversion and Management，2014，83：167-176． doi:10.1016/j.enconman.2014.03.067
[14]	高虎，刘凡，李海．碳中和目标下氨燃料的机遇、挑战及应用前景[J]．发电技术，2022，43(3)：462-467． doi:10.12096/j.2096-4528.pgt.22059
	GAO H， LIU F， LI H ．Opportunities，challenges and application prospects of ammonia fuel under the target of carbon neutrality[J]．Power Generation Technology，2022，43(3)：462-467． doi:10.12096/j.2096-4528.pgt.22059
[15]	罗志斌，孙潇，高啸天，等．双碳背景下绿色氨能的应用场景及展望[J]．南方能源建设，2023，10(3)：47-54．
	LUO Z B， SUN X， GAO X T，et al ．Development prospects and application scenarios of green ammonia energy industry under the background of carbon peak and neutrality[J]．Southern Energy Construction，2023，10(3)：47-54．
[16]	汪鑫，陈钧，范卫东．燃煤电站锅炉掺氨燃烧与排放特性综述[J]．洁净煤技术，2022，28(8)：25-34．
	WANG X， CHEN J， FAN W D ．Review on combustion and emission characteristics of coal-fired utility boilers ammonia/coal co-firing[J]．Clean Coal Technology，2022，28(8)：25-34．
[17]	底一，黄骞，马鹏，等．生物质掺氨燃烧特性试验研究[J]．中国电机工程学报，2022，42(18)：6547-6552．
	DI Y， HUANG Q， MA P，et al ．Experimental investigation on combustion characteristics of cofiring biomass with ammonia[J]．Proceedings of the CSEE，2022，42(18)：6547-6552．
[18]	龚艳艳．煤氨混燃方式与掺氨比对燃料排放特性的影响研究[J]．煤质技术，2023，38(4)：46-52．
	GONG Y Y ．Study on the influence of coal ammonia mixed combustion method and ammonia mixing ratio on fuel emission characteristics[J]．Coal Quality Technology，2023，38(4)：46-52．
[19]	王志超，方亮，贾子秀，等．不同比例氨与煤混燃试验研究[J]．热力发电，2023，52(7)：41-47．
	WANG Z C， FANG L， JIA Z X，et al ．Experimental study on co-combustion of different ratios of ammonia with coal[J]．Thermal Power Generation，2023，52(7)：41-47．
[20]	王华坤，徐义书，张保华，等．煤掺氨燃烧过程中NO生成特性和氨氮转化行为研究[J]．能源环境保护，2023，37(4)：30-37．
	WANG H K， XU Y S， ZHANG B H，et al ．Study on NO formation characteristics and ammonia-nitrogen conversion behavior during ammonia-coal co-firing[J]．Energy Environmental Protection，2023，37(4)：30-37．
[21]	赖诗妮，江丽霞，李军，等．含碳掺氨燃料的研究进展[J]．化工进展，2023，42(9)：4603-4615．
	LAI S N， JIANG L X， LI J，et al ．Research progress of ammonia blended fossil fuel[J]．Chemical Industry and Engineering Progress，2023，42(9)：4603-4615．
[22]	徐静颖，朱鸿玮，徐义书，等．燃煤电站锅炉氨燃烧研究进展及展望[J]．华中科技大学学报(自然科学版)，2022，50(7)：55-65． doi:10.13245/j.hust.220705
	XU J Y， ZHU H W， XU Y S，et al ．Research progress and prospect of ammonia cofiring in utility coal-fired boiler[J]．Journal of Huazhong University of Science and Technology (Natural Science Edition)，2022，50(7)：55-65． doi:10.13245/j.hust.220705
[23]	CHEN C， WANG Z， ZHU R，et al ．Co-firing characteristics and fuel-N transformation of ammonia/pulverized coal binary fuel[J]．Fuel，2023，337：126857． doi:10.1016/j.fuel.2022.126857
[24]	ZHANG H， LIU J， WANG X，et al ．Density functional theory study on two different oxygen enhancement mechanisms during NO-char interaction[J]．Combustion and Flame，2016，169：11-18． doi:10.1016/j.combustflame.2016.03.023
[25]	刘鹏，朱江涛，沈平虹，等．高温还原性气氛条件下喷氨脱硝机理优化[J]．燃烧科学与技术，2018，24(6)：487-492．
	LIU P， ZHU J T， SHEN P H，et al ．Optimization of mechanisms for ammonia-injected de-NO _x reactions in a high-temperature and reducing atmosphere[J]．Journal of Combustion Science and Technology，2018，24(6)：487-492．
[26]	陈萍，花昌豪，王佩佩，等．氨煤混燃NO生成机理研究[J]．煤炭转化，2023，46(4)：51-58．
	CHEN P， HUA C H， WANG P P，et al ．Study on NO formation mechanism of ammonia-coal co-combustion[J]．Coal Conversion，2023，46(4)：51-58．
[27]	朱京冀，徐义书，徐静颖，等．掺烧氨燃料对煤挥发分火焰特性及颗粒物生成的影响[J]．发电技术，2022，43(6)：908-917．
	ZHU J J， XU Y S， XU J Y，et al ．Effect of co-firing ammonia on coal volatile flame characteristics and particulate matter formation behaviours[J]．Power Generation Technology，2022，43(6)：908-917．
[28]	马仑，方庆艳，张成，等．深度空气分级下煤粉耦合氨燃烧及NO生成特性[J]．洁净煤技术，2022，28(3)：201-213．
	MA L， FANG Q Y， ZHANG C，et al ．Combustion and NO formation characteristics of pulverized coal co-firing with ammonia in a deep-air staging condition[J]．Clean Coal Technology，2022，28(3)：201-213．
[29]	JIN W， SI F， CAO Y，et al ．Numerical research on ammonia-coal co-firing in a 1050 MW coal-fired utility boiler under ultra-low load：effects of ammonia ratio and air staging condition[J]．Applied Thermal Engineering，2023，233：121100． doi:10.1016/j.applthermaleng.2023.121100
[30]	LYU Q， WANG R， DU Y，et al ．Numerical study on coal/ammonia co-firing in a 600 MW utility boiler[J]．International Journal of Hydrogen Energy，2023，48(45)：17293-17310． doi:10.1016/j.ijhydene.2023.01.232
[31]	ZHANG J， ITO T， ISHII H，et al ．Numerical investigation on ammonia co-firing in a pulverized coal combustion facility：effect of ammonia co-firing ratio[J]．Fuel，2020，267：117166． doi:10.1016/j.fuel.2020.117166
[32]	XU Y， WANG H， LIU X，et al ．Mitigating CO₂ emission in pulverized coal-fired power plant via co-firing ammonia：a simulation study of flue gas streams and exergy efficiency[J]．Energy Conversion and Management，2022，256：115328． doi:10.1016/j.enconman.2022.115328
[33]	WANG S， SHENG C ．Evaluating the effect of ammonia co-firing on the performance of a pulverized coal-fired utility boiler[J]．Energies，2023，16(6)：2773． doi:10.3390/en16062773
[34]	CHEN L， WANG C， WANG W ．Effect of ammonia co-firing on heat transfer，safety，and economy of coal-fired boilers[J]．Fuel，2023，334：126649． doi:10.1016/j.fuel.2022.126649
[35]	王彬滨，余江，张荣，等．典型风电场地形大气稳定度对风机出力的影响．南方能源建设，2024，11(1)：105-111．
	WANG B B， YU J， ZHANG R，et al ．Influence of atmospheric stability on wind power output under typical wind field topography[J]．Southern Energy Construction，2024，11(1)：105-111．
[36]	周强泰．锅炉原理[M]．3版．北京：中国电力出版社，2013：157-159．
	ZHOU Q T ．Boiler principle[M]．3rd ed．Beijing：China Electric Power Press，2013：157-159．
[37]	TAMURA M， GOTOU T， ISHII H，et al ．Experimental investigation of ammonia combustion in a bench scale 1.2 MW-thermal pulverised coal firing furnace[J]．Applied Energy，2020，277：115580． doi:10.1016/j.apenergy.2020.115580

参数	工业分析				元素分析					发热量/(MJ/kg)
参数	M_ar	F_Car	V_ar	A_ar	C_ar	H_ar	O_ar	N_ar	S_ar	发热量/(MJ/kg)
数值	14.50	48.32	29.48	7.70	62.58	3.70	10.05	1.07	0.40	24.00

参数	工业分析				元素分析					发热量/(MJ/kg)
参数	M_ar	F_Car	V_ar	A_ar	C_ar	H_ar	O_ar	N_ar	S_ar	发热量/(MJ/kg)
数值	14.50	48.32	29.48	7.70	62.58	3.70	10.05	1.07	0.40	24.00

锅炉负荷	掺氨比例/%	给煤量/(kg/s)	给氨量/(kg/s)	总空气量/(kg/s)
100%负荷	0	58.24	0	559.83
	20	46.59	15.03	557.98
	40	34.95	30.16	555.87
75%负荷	0	44.26	0	425.42
	20	35.41	11.42	424.01
	40	26.56	22.84	422.41
50%负荷	0	30.34	0	291.60
	20	24.27	7.83	290.63
	40	18.20	15.66	289.54

锅炉负荷	掺氨比例/%	给煤量/(kg/s)	给氨量/(kg/s)	总空气量/(kg/s)
100%负荷	0	58.24	0	559.83
	20	46.59	15.03	557.98
	40	34.95	30.16	555.87
75%负荷	0	44.26	0	425.42
	20	35.41	11.42	424.01
	40	26.56	22.84	422.41
50%负荷	0	30.34	0	291.60
	20	24.27	7.83	290.63
	40	18.20	15.66	289.54

参数	100%负荷		50%负荷
参数	设计值	计算值	设计值	计算值
屏式过热器出口烟温/℃	1 126.0	1 126.0	1 008.0	1 009.8
高温再热器出口烟温/℃	768.0	768.0	685.0	685.9
空预器进口烟温/℃	355.0	355.0	297.0	297.0
排烟温度/℃	119.0	119.0	99.0	99.2
高温过热器进口蒸汽温度/℃	510.0	510.0	520.0	519.7
高温过热器出口蒸汽温度/℃	541.0	541.0	541.0	540.9
壁式再热器进口蒸汽温度/℃	310.0	310.0	301.0	301.0
高温再热器出口蒸汽温度/℃	541.0	541.0	539.0	539.0