Influence of Thermal Inertia of Refractory Material in Furnace on the Peak Regulating Rate of Circulating Fluidized Bed Boiler

doi:10.12096/j.2096-4528.pgt.22175

Abstract

Abstract:

The influence of thermal inertia of the furnace refractory on the peak regulation characteristics of a 300 MW circulating fluidized bed boiler (CFB) was studied by using a numerical calculation method. Based on the actual operation conditions of the boiler, the calculation results reveal that the thermal inertia of refractory is affected by its thermal conductivity and the thickness. Specifically, the thermal inertia of refractory decreases with the increasing thermal conductivity and decreasing refractory thickness. As a consequence, the time that required for the refractory to reach heat equilibrium decreases from 5 812 s to 3 426 s if the thermal conductivity of refractory increases from 1 W/(m?K) to 15 W/(m?K), while it increases from 3 267 s to 7 771 s if the thickness of refractory material increases from 30 mm to 90 mm. Practically in the presence of the traditional refractory in the CFB dense phase zone, the time required to achieve heat equilibrium state becomes 82, 65 and 60 min when the load of this CFB boiler rises from 50% to 100% with a rate of 1%/min, 2%/min and 3%/min. For a refractory with higher thermal conductivity, the equilibrium response time will be reduced to 65, 46 and 40 min, correspondingly. According to the calculation results, a formula for the heat absorption rate of refractory material was obtained. In addition, the influencing coefficient of the thermal inertia of refractory on coal feeding was also defined and calculated.

Key words: circulating fluidized bed (CFB), peak regulation, thermal inertia, thermal conductivity

CLC Number:

TK 22

Zhonghao DONG, Xiaofeng LU, Lichao SHI, Zengzeng YANG, Fansheng KONG, Peng WANG, Guoqiang LIN, Peng ZHAO. Influence of Thermal Inertia of Refractory Material in Furnace on the Peak Regulating Rate of Circulating Fluidized Bed Boiler[J]. Power Generation Technology, 2023, 44(4): 514-524.

Figures/Tables 16

References 33

1	GU Y J， XU J， CHEN D C，et al ．Overall review of peak shaving for coal-fired power units in China[J]．Renewable and Sustainable Energy Reviews，2016，54：723-731． doi:10.1016/j.rser.2015.10.052
2	XUE Y S， ZHENG Y Q， RAHMAN S ．Proceedings of purple mountain forum 2019-international forum on smart grid protection and control[M]．Singapore：Springer，2019． doi:10.1007/978-981-13-9783-7
3	王珏，廖溢文，韩文福，等．碳达峰背景下抽水蓄能-风电联合系统建模及有功功率控制特性研究[J]．水利水电技术，2021，52(9)：172-181． doi:10.13928/j.cnki.wrahe.2021.09.018
	WANG Y， LIAO Y W， HAN W F，et al ．Modeling and active power control characteristics of pumped storage-wind hybrid power system in the context of peak carbon dioxide emission[J]．Water Resources and Hydropower Engineering，2021，52(9)：172-181． doi:10.13928/j.cnki.wrahe.2021.09.018
4	王磊，牛耘依，孟娜，等．考虑调峰与储能特性的抽蓄电站服务电网综合评价[J]．电网与清洁能源，2022，38(5)：135-142． doi:10.3969/j.issn.1674-3814.2022.05.018
	WANG L， NIU Y Y， MENG N，et al ．Comprehensive evaluation of pumped storage power plant serving grid considering peak regulation and energy storage[J]．Power System and Clean Energy，2022，38(5)：135-142． doi:10.3969/j.issn.1674-3814.2022.05.018
5	魏文，姜飞，戴双凤，等．计及需求侧储能事故备用风险与火电机组深度调峰的经济优化研究[J]．电力系统保护与控制，2022，50(10)：153-162．
	WEI W， JIANG F， DAI S F，et al ．Economic optimization of deep peak regulation of thermal power units taking into account the risk of emergency storage on the demand side[J]．Power System Protection and Control，2022，50(10)：153-162．
6	于国强，刘克天，胡尊民，等．大规模新能源并网下火电机组深度调峰优化调度[J]．电力工程技术，2023，42(1)：243-250． doi:10.12158/j.2096-3203.2023.01.029
	YU G Q， LIU K T， HU Z M，et al ．Optimal scheduling of deep peak regulation for thermal power units in power grid with large-scale new energy[J]．Electric Power Engineering Technology，2023，42(1)：243-250． doi:10.12158/j.2096-3203.2023.01.029
7	张松岩，苗世洪，尹斌鑫，等．考虑火电深度调峰的多类型储能经济性分析[J]．电力建设，2022，43(1)：132-142． doi:10.12204/j.issn.1000-7229.2022.01.015
	ZHANG S Y， MIAO S H， YIN B X，et al ．Economic analysis of multi-type energy storages considering the deep peak-regulation of thermal power units[J]．Electric Power Construction，2022，43(1)：132-142． doi:10.12204/j.issn.1000-7229.2022.01.015
8	闫修峰，宗珂，何修年，等．1 000 MW煤电机组调峰中汽温控制策略研究[J]．发电技术，2022，43(3)：518-522． doi:10.12096/j.2096-4528.pgt.21024
	YAN X F， ZONG K， HE X N，et al ．Research on steam temperature control strategy in peak regulation of 1 000 MW coal power unit[J]．Power Generation Technology，2022，43(3)：518-522． doi:10.12096/j.2096-4528.pgt.21024
9	牛斌，李丽锋，孙倩，等．超临界循环流化床机组全负荷段深度调峰方法研究[J]．发电技术，2021，42(2)：273-279． doi:10.12096/j.2096-4528.pgt.20024
	NIU B， LI L F， SUN Q，et al ．Research on the method of depth peaking at full load of supercritical circulating fluidized bed unit[J]．Power Generation Technology，2021，42(2)：273-279． doi:10.12096/j.2096-4528.pgt.20024
10	宋畅，吕俊复，杨海瑞，等．超临界及超超临界循环流化床锅炉技术研究与应用[J]．中国电机工程学报，2018，38(2)：338-347．
	SONG C， LYU J F， YANG H R，et al ．Research and application of supercritical and ultra-supercritical circulating fluidized bed boiler technology[J]．Proceedings of the CSEE，2018，38(2)：338-347．
11	蔡晋，单露，王志宁，等．超临界350 MW循环流化床锅炉变负荷特性[J]．热力发电，2020，49(9)：98-103． doi:10.19666/j.rlfd.202002012
	CAI J， SHAN L， WANG Z N，et al ．Variable load characteristics of a supercritical 350 MW circulating fluidized bed boiler[J]．Thermal Power Generation，2020，49(9)：98-103． doi:10.19666/j.rlfd.202002012
12	张绪辉，杨兴森，辛刚，等．燃煤火电机组深度调峰运行试验[J]．洁净煤技术，2022，28(4)：144-150．
	ZHANG X H， YANG X S， XIN G，et al ．Experimental study on deep peak regulation operation of coal-fired thermal power unit[J]．Clean Coal Technology，2022，28(4)：144-150．
13	杨中智，卢啸风，角加艺，等．大型CFB锅炉低负荷再热汽温稳定特性研究[J]．洁净煤技术，2023，29(6)：32-39．
	YANG Z Z， LU X F， JIAO J Y，et al ．Study on temperature stability characteristics of low load reheat steam in large CFB boiler[J]．Clean Coal Technology，2023，29(6)：32-39．
14	洪烽．基于蓄能深度利用的循环流化床机组动态优化控制[D]．北京：华北电力大学，2019．
	HONG F ．Dynamic optimal control of criculating fluidized bed unit based on deep utilization of stored energy[D]．Beijing：School of Energy Power and Mechanical Engineering，2019．
15	李政，王哲，倪维斗．循环流化床全工况实时动态数学模型的研究[J]．动力工程，2000，20(1)：511-514． doi:10.3969/j.issn.1674-7607.2000.01.002
	LI Z， WANG Z， NI W D ．Study of full working scope dynamic mathematical model for CFBC[J]．Power Engineering，2000，20(1)：511-514． doi:10.3969/j.issn.1674-7607.2000.01.002
16	GAO M M， HONG F， LIU J Z ．Investigation on energy storage and quick load change control of subcritical circulating fluidized bed boiler units[J]．Applied Energy，2017，185． doi:10.1016/j.apenergy.2016.10.140
17	高明明，岳光溪，雷秀坚，等．超临界CFB锅炉主蒸汽压力控制系统研究[J]．动力工程学报，2015，35(8)：625-631． doi:10.3969/j.issn.1674-7607.2015.08.004
	GAO M M， YUE G X， LEI X J，et al ．Research on main steam pressure control of supercritical CFB boilers[J]．Journal of Chinese Society of Power Engineering，2015，35(8)：625-631． doi:10.3969/j.issn.1674-7607.2015.08.004
18	刘吉臻，洪烽，高明明，等．循环流化床机组快速变负荷运行控制策略研究[J]．中国电机工程学报，2017，37(14)：4130-4137． doi:10.13334/j.0258-8013.pcsee.161055
	LIU J Z， HONG F， GAO M M，et al ．Research on the control strategy for quick load change of circulating fluidized bed boiler units[J]．Proceedings of the CSEE，2017，37(14)：4130-4137． doi:10.13334/j.0258-8013.pcsee.161055
19	ZHANG H F， GAO M M， FENG H，et al ．Control-oriented modelling and investigation on quick load change control of subcritical circulating fluidized bed unit[J]．Applied Thermal Engineering，2019，163:1-12． doi:10.1016/j.applthermaleng.2019.114420
20	STEFANITSIS D， NESIADIS A， NIKOLOPOULOS A，et al ．Simulation of a circulating fluidized bed power plant integrated with a thermal energy storage system during transient operation[J]．Journal of Energy Storage，2021，43：1-17． doi:10.1016/j.est.2021.103239
21	DENG B Y， ZHANG M， LYU J F，et al ．Analysis on the safety of the water wall in a 350 MW supercritical cfb boiler under electricity failure condition[J]．Energy，2019，189：116364． doi:10.1016/j.energy.2019.116364
22	韩小华，黄浩天，闫希晔，等．大体积混凝土内部温度控制与现场测温差异分析[J]．建筑技术，2022，53(8)：1094-1097． doi:10.3969/j.issn.1000-4726.2022.08.035
	HAN X H， HUANG H T， YAN X Y，et al ．Analysis of difference between internal temperature control and on-site temperature measurement of mass concrete[J]．Architecture Technology，2022，53(8)：1094-1097． doi:10.3969/j.issn.1000-4726.2022.08.035
23	张絮涵．混凝土埋管式辐射冷顶板室内非稳态换热特性研究[D]．长沙：湖南大学，2016． doi:10.1016/j.buildenv.2015.11.006
	ZHANG X H ．Research on the characteristics of non-steady state heat transfer in the room with concrete ceiling radiant cooling panels[D]．Changsha：Hunan University，2016． doi:10.1016/j.buildenv.2015.11.006
24	RAFIQUE M M， NATHAN G，SAW W ．A mathematical model to assess the influence of transients on a refractory-lined solar receiver[J]．Renewable Energy，2021，167(C)：217-235． doi:10.1016/j.renene.2020.11.077
25	RAFIQUE M M， NATHAN G，SAW W ．Modelled annual thermal performance of a 50 MW refractory-lined particle-laden solar receiver operating above 1 000 ℃[J]．Renewable Energy，2022，197：168-175． doi:10.1016/j.renene.2022.07.111
26	RAFIQUE M M， NATHAN G，SAW W ．Thermal response of multilayered refractory-lined solar receivers to transient operation[J]．Solar Energy，2022，243：352-361． doi:10.1016/j.solener.2022.07.037
27	QI G L， LIU X M， WANG Z W，et al ．Numerical simulation and optimization of heat-insulation material and structure for CFB boiler[J]．Thermal Science and Engineering Progress，2020，20(12)：100692． doi:10.1016/j.tsep.2020.100692
28	FENG H J， CHEN L G， XIE Z H，et al ．Constructal designs for insulation layers of steel rolling reheating furnace wall with convective and radiative boundary conditions[J]．Applied Thermal Engineering，2016，100：145-152． doi:10.1016/j.applthermaleng.2016.02.129
29	ZHOU X H， NIU T T， XIN Y F，et al ．Experimental and numerical investigation on heat transfer in the vertical upward flow water wall of a 660 MW ultra-supercritical CFB boiler[J]．Applied Thermal Engineering，2021，188：169-178． doi:10.1016/j.applthermaleng.2021.116664
30	PAN J， WU G， YANG D ．Thermal-hydraulic calculation and analysis on water wall system of 600 MW supercritical CFB boiler[J]．Applied Thermal Engineering，2015，82：225-236． doi:10.1016/j.applthermaleng.2015.03.004
31	LI J， TUNG Y， KWAUK M ．Energy transport and regime transition in particle-fluid two-phase flow[C]//Proceedings of the Second International Conference on Circulating Fluidized Beds，Compiégne，France．1988：75-87． doi:10.1016/b978-0-08-036225-0.50012-5
32	黄永志．循环流化床锅炉水动力特性研究[D]．上海：上海交通大学，2016．
	HUANG Y Z ．Research on water circulation characteristics of evaporating system in CFB boiler[D]．Shanghai：Shanghai Jiaotong University，2016．
33	张宏涛，徐冰，白玉星，等．钢混凝土界面接触热阻试验研究[J]．土木建筑与环境工程，2015，37(2)：34-38． doi:10.11835/j.issn.1674-4764.2015.02.006
	ZHANG H T， XU B， BAI Y X，et al ．Experiment alanalysis of interface thermal contact resistance between steel and concrete[J]．Journal of Civil， Architectural & Environmental Engineering，2015，37(2)：34-38． doi:10.11835/j.issn.1674-4764.2015.02.006

分布位置		耐火防磨浇注料/mm	耐火保温砖/mm
炉膛	布风板	77	—
	炉膛锥段	60	—
	屏式受热面	50	—
旋风分离器	分离器入口	25	—
	分离器筒段	25	—
	分离器锥段	25	—
立管及回料阀	立管	150	250
	回料阀	150	250
	返料腿	150	250

分布位置		耐火防磨浇注料/mm	耐火保温砖/mm
炉膛	布风板	77	—
	炉膛锥段	60	—
	屏式受热面	50	—
旋风分离器	分离器入口	25	—
	分离器筒段	25	—
	分离器锥段	25	—
立管及回料阀	立管	150	250
	回料阀	150	250
	返料腿	150	250

部位		耐火防磨浇注料	耐火保温砖	总计
炉膛	布风板	27.53	—	166.46
	炉膛锥段	115.17	—
	屏式受热面	23.76	—
旋风分离器	分离器入口	37.81	—	151.49
	分离器筒段	76.14	—
	分离器锥段	37.57	—
立管及回料阀	立管	44.69	16.59	308.75
	回料阀	30.11	10.95
	返料腿	147.99	58.42

部位		耐火防磨浇注料	耐火保温砖	总计
炉膛	布风板	27.53	—	166.46
	炉膛锥段	115.17	—
	屏式受热面	23.76	—
旋风分离器	分离器入口	37.81	—	151.49
	分离器筒段	76.14	—
	分离器锥段	37.57	—
立管及回料阀	立管	44.69	16.59	308.75
	回料阀	30.11	10.95
	返料腿	147.99	58.42

参数	工况1	工况2
耐火材料导热率λ/[W/(m⋅K)]	1，1.2，2，3，4，5，10，15	1.2
炉侧换热系数h_f/[W/(m²⋅K)]	360	360
耐火材料厚度δ_r/mm	60	30，40，50，60，70，80，90
耐火材料密度ρ/(kg/m³)	2 750	2 750
耐火材料比热容c_p /[J/(kg⋅K)]	1 092	1 092
工质温度t_b/℃	330	330
初始温度T₁/℃	850	850
终止温度T₂/℃	950	950