[1]魏莉,钟文琪,邵应娟.煤流化床加压富氧燃烧过程的动态特性[J].东南大学学报(自然科学版),2020,50(2):358-367.[doi:10.3969/j.issn.1001-0505.2020.02.021]
　Wei Li,Zhong Wenqi,Shao Yingjuan.Dynamic characteristics of pressurized oxy-fuel combustion in fluidized bed[J].Journal of Southeast University (Natural Science Edition),2020,50(2):358-367.[doi:10.3969/j.issn.1001-0505.2020.02.021]
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煤流化床加压富氧燃烧过程的动态特性()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
50
期数:
2020年第2期
页码:
358-367
栏目:
化学化工
出版日期:
2020-03-20

文章信息/Info

Title:
Dynamic characteristics of pressurized oxy-fuel combustion in fluidized bed
作者:
魏莉; 钟文琪; 邵应娟
东南大学能源热转换及其过程测控教育部重点实验室, 南京 210096
Author(s):
Wei Li;  Zhong Wenqi;  Shao Yingjuan
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China
关键词:
富氧燃烧;  加压流化床;  动态特性;  烟气组分计算
Keywords:
oxy-fuel combustion;  pressurized fluidized bed;  dynamic characteristics;  calculation of flue gas components
分类号:
TQ534
DOI:
10.3969/j.issn.1001-0505.2020.02.021
摘要:
为全面深入地了解流化床加压富氧燃烧过程动态特性,建立了流化床加压富氧燃烧过程动态模型,充分考虑了燃烧气氛和燃烧压力改变对炉内燃烧以及烟气组成的影响.基于该模型分别研究了送风氧浓度、燃烧压力以及燃煤量改变时,炉内床温和烟气中各组分体积分数的动态响应,并对其在不同氧浓度和燃烧压力下的响应特性进行研究.研究结果表明,氧浓度、燃烧压力以及燃料量阶跃增加10%会引起炉内床温升高,其中密相区响应速度更快;同时,烟气中各组分体积分数在不同参数扰动下响应各异,主要受到此时炉内燃烧状况以及对应的风量、燃料量改变的影响.此外,床温和烟气中CO2体积分数在压力以及氧浓度突然增加时的动态响应分别在高氧浓度、高燃烧压力下更明显,响应速度更快.整个变化过程中,烟气中CO2体积分数为90%左右,烟气中O2体积分数在8%以下.研究所得相关动态响应规律可对后续控制系统设计及优化提供参考与依据.
Abstract:
To understand the dynamic characteristics of pressurized oxy-fuel combustion process, a dynamic model was established considering both the effects of the combustion atmosphere and pressure on combustion and flue gas composition. Based on the model, the dynamic response of bed temperature and the volume fraction of each component in the flue gas with the step increase of inlet O2 concentration, combustion pressure, and coal feeding rate were studied as well as the response characteristics under different inlet O2 concentrations and combustion pressures. The results show that, a 10% step increase of inlet O2 concentration, the combustion pressure and the coal feeding rate can increase the bed temperature inside the furnace, of which the response speed in the dense phase zone is faster. Meanwhile, the dynamic response of the volume fraction of each component in flue gas varies under different disturbances, it is mainly affected by the combustion conditions in the furnace, the corresponding changes in oxidant and coal. In addition, the dynamic variations of the bed temperature and the CO2 volume fraction in the flue gas are more obvious with faster response speed under the higher inlet O2 concentration and the combustion pressure. During the whole process, the volume fraction of CO2 in flue gas is about 90%, with the volume fraction of O2 under 8%. The dynamic characteristics obtained can provide a reference for the design and optimization of the control strategy in the combustion system.

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备注/Memo

备注/Memo:
收稿日期: 2019-08-12.
作者简介: 魏莉(1996—),女,硕士生;钟文琪(联系人),男,博士,教授,博士生导师,wqzhong@seu.edu.cn.
基金项目: 国家自然科学基金重点资助项目(51736002)、国家自然科学基金面上资助项目(51876037).
引用本文: 魏莉,钟文琪,邵应娟.煤流化床加压富氧燃烧过程动态特性研究[J].东南大学学报(自然科学版),2020,50(2):358-367. DOI:10.3969/j.issn.1001-0505.2020.02.021.
更新日期/Last Update: 2020-03-20