Energy-saving and carbon-reducing operation control and engineering verification of circulating fluidized bed boiler

doi:10.3785/j.issn.1008-973X.2024.08.009

Journal of ZheJiang University (Engineering Science)

2024, Vol. 58

Issue (8): 1618-1627 DOI: 10.3785/j.issn.1008-973X.2024.08.009

Energy-saving and carbon-reducing operation control and engineering verification of circulating fluidized bed boiler

Qinwu LI1,2,3(

),Libin YU1,3,Tingyu LIU2,Jingxu ZHANG2,Weiguo WEN4,Zhengjie ZHENG2,Tao WANG2,Hai WANG2,Chenghang ZHENG1,3,*(

),Xiang GAO1,3

1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
2. Zhejiang Hope Environmental Protection Engineering Limited Company, Hangzhou 310012, China
3. Institute of Carbon Neutrality, Zhejiang University, Hangzhou 310027, China
4. Jiaxing Research Institute, Zhejiang University, Jiaxing 314001, China

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Abstract

A cooperative control model based on volume fraction of oxygen in flue gas and furnace outlet pressure was established in order to accurately predict the trend of real-time volume fraction of oxygen and provide control instructions for the secondary air fan and induced draft fan of the boiler in advance. Then the fluctuation of key operating parameters such as volume fraction of oxygen and furnace outlet pressure of the boiler was significantly reduced under different load conditions. The industrial validation results on a 300 t/h circulating fluidized bed boiler show that the cooperative control model can improve the quality of boiler operation and control. The statistical probability that the volume fraction of oxygen was controlled within the target value of ±0.25%, and the furnace outlet pressure was controlled within the target value of ±45 Pa under varying load conditions was 99%. The statistical results of one week’s operation showed that the cooperative control model could reduce coal consumption per unit of steam production by 1.508%, and fan power consumption per unit of steam production by 1.886% compared with the original control.

Key words： volume fraction of oxygen cooperative control model furnace outlet pressure energy saving and carbon reduction

Received: 27 December 2023 Published: 23 July 2024

CLC:

X 51

Fund: 国家自然科学基金资助项目（42341208）；中央高校基本科研业务费专项资金资助项目（2022ZJJH02-03）.

Corresponding Authors: Chenghang ZHENG E-mail: 727180194@qq.com;zhengch2003@zju.edu.cn

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	Articles by authors
	Qinwu LI
	Libin YU
	Tingyu LIU
	Jingxu ZHANG
	Weiguo WEN
	Zhengjie ZHENG
	Tao WANG
	Hai WANG
	Chenghang ZHENG
	Xiang GAO

Cite this article:

Qinwu LI,Libin YU,Tingyu LIU,Jingxu ZHANG,Weiguo WEN,Zhengjie ZHENG,Tao WANG,Hai WANG,Chenghang ZHENG,Xiang GAO. Energy-saving and carbon-reducing operation control and engineering verification of circulating fluidized bed boiler. Journal of ZheJiang University (Engineering Science), 2024, 58(8): 1618-1627.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2024.08.009 OR https://www.zjujournals.com/eng/Y2024/V58/I8/1618

循环流化床锅炉节能减碳运行调控及工程验证

构建基于烟气中氧气体积分数及炉膛出口压力的锅炉运行协同控制模型，可以实时、准确地预测烟气中氧气体积分数的变化趋势，提前给定锅炉二次风机和引风机控制指令，显著减小了不同负荷条件下锅炉烟气中氧气体积分数、负压等关键运行参数的波动. 在300 t/h循环流化床锅炉上的工业验证结果表明：利用协同控制模型可以提高锅炉运行控制的品质，锅炉变负荷工况条件下烟气中氧气体积分数控制在目标值±0.25%范围内，炉膛出口压力控制在目标值±45 Pa范围内的统计概率为99%. 运行一周的统计结果表明，相比于原有控制，协同控制模型投运后单位产汽量耗煤可以减小1.508%，单位产汽量风机耗电可以减少1.886%.

关键词： 氧气体积分数, 协同控制模型, 炉膛出口压力, 节能减碳

Tab.1 Operational variables related to collaborative control model

Fig.1 Feature importance of relevant variables in Catboost model

Fig.2 Schematic diagram of cooperative control model

Fig.3 Comparison between measured and predicted values of volume fraction of oxygen in flue gas

Fig.4 Comparison of actual operational effects between cooperative control model and original control

Fig.5 Comparison of long-term actual operation effects between cooperative control model and original control

Tab.2 Energy-saving analysis of weekly operation data of cooperative control model

Tab.3 Benefit analysis of cooperative control model operation


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