Application and Energy-saving Analysis of Built-in Array Acoustic Sootblower

doi:10.12096/j.2096-4528.pgt.19146

Abstract

Abstract:

Because the traditional steam sootblowing technology has a dead corner, it needs a lot of high quality steam, and the safety of the steam is affected by the scouring of the heating surface. Therefore, in recent years, many new power plants tend to adopt built-in array acoustic sootblower in the low-temperature flue to purge the low-temperature reheater, low-temperature superheater and economizer. Combined with the application of acoustic sootblower in a 660 MW power plant, the economic evaluation was studied. The sootblowing economy was evaluated by two indexes:boiler efficiency at boiler side and steam turbine thermal efficiency at turbine side. The boiler anti-balance method was used to calculate the boiler efficiency variation when the exhaust gas temperature changed 1℃ under a certain load. The increase of boiler efficiency was calculated by the decrease of flue gas temperature after sootblowing, and the decrease of coal consumption was further calculated. By using the calculation method of heat carrying out system by working medium in the equivalent enthalpy drop method, the influence of sootblowing steam on the heat consumption of steam turbine was obtained, and the increase of coal consumption was further calculated. The economic gain of acoustic sootblower was obtained by considering the economic evaluation of boiler side and steam turbine side. The results show that compared with the conventional steam sootblower, the annual cost saving of the built-in array acoustic sootblower is more than 1 million yuan. In addition, it will have better energy-saving effect for units with poor economic performance for many years.

Key words: coal-fired generating units, built-in array acoustic sootblower, energy-saving analysis, economic evaluation

CLC Number:

TK229.6

Lei ZHOU, Ju ZHANG, Ziyuan SONG, Zhiping YANG, Peihu GUO, Haiping XIAO, Chen ZHANG, Jianlong LI. Application and Energy-saving Analysis of Built-in Array Acoustic Sootblower[J]. Power Generation Technology, 2020, 41(6): 706-714.

Figures/Tables 12

References 17

1	陈自勇, 程旻, 廖强, 等. 燃煤锅炉烟气侧换热表面的积灰机制及影响因素[J]. 中国电机工程学报, 2019, 39 (5): 1349- 1366.
	CHEN Z Y , CHENG M , LIAO Q , et al. A review on ash deposition on heat exchanger surface in coal-fired boilers:mechanisms and influence factors[J]. Proceedings of the CSEE, 2019, 39 (5): 1349- 1366.
2	赵建新. 波纹板安全吹灰蒸汽参数分析[J]. 发电技术, 2018, 39 (3): 259- 262.
	ZHAO J X . Optimization analysis of soot blowing steam parameters of corrugated plate[J]. Power Generation Technology, 2018, 39 (3): 259- 262.
3	何雅玲, 汤松臻, 王飞龙, 等. 中低温烟气换热器气侧积灰、磨损及腐蚀的研究[J]. 科学通报, 2016, 61 (17): 1858- 1876.
	HE Y L , TANG S Z , WANG F L , et al. Gas-side fouling, erosion and corrosion of heat exchanger for middle and low temperature flue gas waste heat recovery[J]. Chinese Science Bulletin, 2016, 61 (17): 1858- 1876.
4	邱利雄, 张利, 熊鸣, 等. 锅炉远程水吹灰器更换小口径喷嘴研究[J]. 发电技术, 2018, 39 (2): 153- 157.
	QIU L X , ZHANG L , XIONG M , et al. Analysis on replacing of smaller bore nozzles for long-distance water soot blower[J]. Power Generation Technology, 2018, 39 (2): 153- 157.
5	胡胜林, 李源, 毛睿, 等. 低氮改造后再热汽温偏低的燃烧调整研究[J]. 发电技术, 2019, 40 (5): 475- 480.
	HU S L , LI Y , MAO R , et al. Study on low reheat steam temperature after low NOx retrofit based on combustion adjustment[J]. Power Generation Technology, 2019, 40 (5): 475- 480.
6	姚军. 锅炉尾部烟道声波吹灰器使用经济性分析[J]. 机电信息, 2016, (18): 114- 115. DOI
	YAO J . Economic analysis of the use of acoustic soot-blower in the flue of boiler tail[J]. Mechanical and Electrical Information, 2016, (18): 114- 115. DOI
7	黄磊. 低频大功率旋笛式可调频声波吹灰器在锅炉尾部受热面的运用[J]. 电力设备管理, 2018, (2): 58- 60.
	HUANG L . Application of low-frequency high-power rotary flute type FM Sonic soot blower in boiler tail heating surface[J]. Electric Power Equipment Management, 2018, (2): 58- 60.
8	张峰. 声波吹灰器在锅炉吹灰中的应用研究[J]. 电声技术, 2018, 42 (3): 25- 27.
	ZHANG F . Application of sonic soot blower in boiler blowing[J]. Audio Engineering, 2018, 42 (3): 25- 27.
9	王永军. 高声强阵列式声波吹灰器在热电厂锅炉上的应用[J]. 机电信息, 2015, (15): 51- 53. DOI
	WANG Y J . Application of high sound intensity array type acoustic ash blower in boiler of thermal power plant[J]. Mechanical and Electrical Information, 2015, (15): 51- 53. DOI
10	杨卫娟, 周俊虎, 刘建忠, 等. 600 MW机组锅炉吹灰器优化投用分析[J]. 热力发电, 2005, (1): 24- 26. DOI
	YANG W J , ZHOU J H , LIU J Z , et al. Analysis of soot-blowing optimization for boiler for 600 MW unit[J]. Thermal Power Generation, 2005, (1): 24- 26. DOI
11	陈朋. 630 MW锅炉尾部烟道吹灰器改造探讨[J]. 化学工程与装备, 2019, (1): 217- 219.
	CHEN P . Discussion on reconstruction of ash blower in tail flue of 630 MW boiler[J]. Chemical Engineering & Equipment, 2019, (1): 217- 219.
12	龚胜, 石奇光, 冒玉晨, 等. 考虑管道效率的蒸汽吹灰对机组煤耗影响的定量分析[J]. 热能动力工程, 2019, 34 (3): 61- 66.
	GONG S , SHI Q G , MAO Y C , et al. Quantitative analysis for the influence of soot-blowing on unit coal consumption rate considering pipeline efficiency[J]. Journal of Engineering for Thermal Energy and Power, 2019, 34 (3): 61- 66.
13	杨小海, 李永华, 黄钢英. 300 MW机组锅炉吹灰优化的经济性研究[J]. 锅炉制造, 2013, 44 (1): 15- 18. DOI
	YANG X H , LI Y H , HUANG G Y . Economic research of 300 MW boiler optimal soot-blowing[J]. Boiler Manufacturing, 2013, 44 (1): 15- 18. DOI
14	蔡晓君, 吴立志. 声波吹灰器的结构与设计[J]. 化工设备与管道, 2003, (1): 32- 33.
	CAI X J , WU L Z . The structure and design of sonic soot blower[J]. Process Equipment & Piping, 2003, (1): 32- 33.
15	张晨, 李建龙.内置阵列式高声强声波吹灰技术及节能计量和智能吹灰优化系统[C]//华润电力首阳山节能减排与技术创新交流研讨会.北京: 国家火力发电工程技术研究中心, 2017: 88-94.
	ZHANG C, LI J L.Built-in array high sound blowing technology and energy-saving metering and intelligent ash blowing optimization system[C]//China Resources Power Shouyangshan Energy Conservation and Emission Reduction and Technology Innovation Exchange Seminar.Beijing: National Thermal Power Engineering Technology Research Center, 2017: 88-94.
16	王学栋, 仲昭伟, 董洋, 等. 多变量因素下的锅炉低压省煤器节能效果测试与分析[J]. 发电技术, 2018, 39 (2): 140- 145.
	WANG X D , ZHONG Z W , DONG Y , et al. Analysis on energy saving effect of low-pressure economizer in boiler under multi-variable factors[J]. Power Generation Technology, 2018, 39 (2): 140- 145.
17	刘传玲, 柳明辉, 陈振江, 等. 投运低压省煤器后汽轮机背压变化分析[J]. 发电技术, 2018, 39 (4): 378- 381.
	LIU C L , LIU M H , CHEN Z J . Analysis on the change of steam turbine back pressure under operation of low pressure economizer[J]. Power Generation Technology, 2018, 39 (4): 378- 381.

指标		设计工况(THA)
指标	100%	90%	80%	70%	60%	50%
锅炉效率/%	94.70	94.70	94.60	94.50	94.40	94.27
管道效率/%	99.00	99.00	99.00	99.00	99.00	99.00
热耗率/ [kJ/(kW?h)]	7 595.52	7626.57	7682.64	7773.39	7909.59	8095.31
发电煤耗率/ [g/(kW?h)]	276.78	277.96	280.27	283.90	289.20	296.37

指标		设计工况(THA)
指标	100%	90%	80%	70%	60%	50%
锅炉效率/%	94.70	94.70	94.60	94.50	94.40	94.27
管道效率/%	99.00	99.00	99.00	99.00	99.00	99.00
热耗率/ [kJ/(kW?h)]	7 595.52	7626.57	7682.64	7773.39	7909.59	8095.31
发电煤耗率/ [g/(kW?h)]	276.78	277.96	280.27	283.90	289.20	296.37

吹灰器类型	耗汽量/(kg/h)	电机功率/kW	吹灰1次耗时/min
短伸缩式	3960	0.18	1.1
长伸缩式	4800	0.75	6.0
半伸缩式	4380	0.75	3.0

吹灰器类型	耗汽量/(kg/h)	电机功率/kW	吹灰1次耗时/min
短伸缩式	3960	0.18	1.1
长伸缩式	4800	0.75	6.0
半伸缩式	4380	0.75	3.0

项目	内置阵列式声波吹灰	常规蒸汽吹灰
项目	内置阵列式声波吹灰	长伸缩式	半伸缩式
吹灰器数量/组(台)	36	28	8
每组(台)吹灰耗汽量/(kg?h^?1)	960	4800	4380
每组(台)吹灰时间/min	2	6	3
吹灰耗时/h	0.6	1.4	0.2
吹灰耗汽量/t	1.152	13.440	1.752
补充水制水单价/(元/t)	15	15	15
补充水制水成本/元	17.28	201.60	26.28
吹灰器功率/kW	0	0.75	0.75
吹灰耗电量/(kW?h)	0	2.1	0.3
平均发电单价/[元/(kW?h)]	0.2	0.2	0.2
吹灰耗电成本/元	0	0.42	0.06
消耗标准煤量/kg	51	1022	6
标煤单价/(元/t)	500	500	500
耗煤成本/元	25.5	511.0	3.0
总成本/元	42.78	713.02	29.34
内置阵列声波吹灰器节约成本/元	713.02+29.34?42.78=699.58