The effectiveness of a novel coal-igniting-fuel technology and application in a direct current burner
Shen, Tao1,2; Song, Minhang3; Huang, Yun3; Zhu, Runru3; Li, Zhengqi1; Yu, Qiang2; Lu, Pisi4; Wang, Minghao2
Source PublicationFUEL
AbstractAs alternative energy sources increase the proportion of intermittent energy supplies in power grids, coal-fired power plants have come to play an important role in flexible peak power regulation. The burner is the core of the pulverized-coal boiler, and so its performance greatly affects the ability to achieve stable combustion at low boiler loads and also determines the load adjustment range. A novel coal-igniting-fuel technology using inter-mediate frequency induction heating has been proposed as a means of obtaining better combustion stability at low and variable loads. This method involves the combustion of a small quantity of coal particles in the ignitor to form a central pilot flame that subsequently ignites the surrounding pulverized coal in the main burner to achieve stable combustion. The present work utilized numerical simulations and full-scale experiments to systematically investigate the coal ignition and combustion characteristics associated with this technology. The numerical re-sults show that coal particles inside the ignitor are rapidly heated and ignited, after which the resulting flame is gathered and accelerated by the flame extension tube, thereby forming a pilot flame near the ignitor outlet. When applied to a direct current (DC) burner, this ignitor is able to ignite the primary coal/air flow in a timely manner to form a second high-temperature zone near the burner nozzle. Compared with the absence of an ignitor, the flame center area appears roughly 1.6 m ahead. In an experiment using a single ignitor, it is found that the induction heating coil can quickly heat coal particles, thereby generating a stable high-temperature heat source within 80 s. The application of this ignitor to a DC burner allows the rapid start of the burner at a low initial ambient temperature, and the load can be adjusted over wide ranges of 17.6% - 100% and 13.6% - 100% when burning Shenhua coal and Blended coal, respectively. The degree of coal burnout is found to gradually improve as the thermal load of the burner is increased, reaching a maximum of approximately 93% at full load.
KeywordCoal-fired ignitor Ignition Stable combustion Low load operation Coal burnout
Funding ProjectNational Natural Science Foundation of China[52006120] ; China Postdoctoral Science Foundation[2019M660633]
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Chemical
Funding OrganizationNational Natural Science Foundation of China ; China Postdoctoral Science Foundation
WOS IDWOS:000702855900003
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Document Type期刊论文
Corresponding AuthorLi, Zhengqi
Affiliation1.Harbin Inst Technol, Sch Energy Sci & Engn, 92 West Dazhi St, Harbin 150001, Peoples R China
2.Harbin Boiler Co Ltd, Harbin 150046, Peoples R China
3.Chinese Acad Sci, Inst Proc Engn, Beijing 100190, Peoples R China
4.RMT Inc, Madison, WI 53717 USA
Recommended Citation
GB/T 7714
Shen, Tao,Song, Minhang,Huang, Yun,et al. The effectiveness of a novel coal-igniting-fuel technology and application in a direct current burner[J]. FUEL,2021,306:10.
APA Shen, Tao.,Song, Minhang.,Huang, Yun.,Zhu, Runru.,Li, Zhengqi.,...&Wang, Minghao.(2021).The effectiveness of a novel coal-igniting-fuel technology and application in a direct current burner.FUEL,306,10.
MLA Shen, Tao,et al."The effectiveness of a novel coal-igniting-fuel technology and application in a direct current burner".FUEL 306(2021):10.
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