IDEAS home Printed from https://ideas.repec.org/a/eee/appene/v164y2016icp258-267.html
   My bibliography  Save this article

Effect of char gasification on NOx formation process in the deep air-staged combustion in a 20kW down flame furnace

Author

Listed:
  • Li, Yu
  • Fan, Weidong

Abstract

Deep air-staged combustion tests of Datong (DT) bituminous coal were carried out in a 20kW down flame furnace (DFF) with the burner stoichiometric ratio (SR) ranging from 1.200 (unstaged) to as low as 0.696 (deep staged). The experimental results shown that the concentration of CO reach as high as 120,000ppm (12vol.%) and the NOx decrease to nearly zero in the reducing zone under deep staging conditions of SR=0.696, which was never observed before. Thus, the extent of CO formation (i.e. char gasification) and the NOx reaction mechanism under deep staging condition were studied in order to understand the combustion process of coal. This paper presents a refined numerical simulation for reproducing the profiles of CO and NOx along the DFF under deep staging condition. The comparison between simulation and experimental results prove the reasonability of refined kinetic parameters of char gasification. The enhancement of char gasification by CO2 is proposed and validated. With the simulated CO profile in the DFF confirmed by experiment, the NOx profile could be further analyzed. The discrepancy of simulated NOx profile in the reducing zone (i.e. fuel-rich zone) indicates that there are some undetected nitrogenous species and undiscovered NOx transfer mechanism regardless of the consistence of final NOx emission between simulation and experiment. It is supposed by us that a majority of NOx immersing in high level of CO in the reducing zone is mainly transferred into undetected nitrogenous species (excluding HCN and NH3) which is then rapidly oxidized into NOx once the remaining oxygen is injected into the DFF.

Suggested Citation

  • Li, Yu & Fan, Weidong, 2016. "Effect of char gasification on NOx formation process in the deep air-staged combustion in a 20kW down flame furnace," Applied Energy, Elsevier, vol. 164(C), pages 258-267.
    • Handle: RePEc:eee:appene:v:164:y:2016:i:c:p:258-267
    DOI: 10.1016/j.apenergy.2015.11.048
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/S0306261915014981
    Download Restriction: Full text for ScienceDirect subscribers only
    File URL: https://libkey.io/10.1016/j.apenergy.2015.11.048?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    References listed on IDEAS

    as
    1. Kim, Ryang-Gyoon & Hwang, Chan-Won & Jeon, Chung-Hwan, 2014. "Kinetics of coal char gasification with CO2: Impact of internal/external diffusion at high temperature and elevated pressure," Applied Energy, Elsevier, vol. 129(C), pages 299-307.
    2. Gomez, Arturo & Silbermann, Rico & Mahinpey, Nader, 2014. "A comprehensive experimental procedure for CO2 coal gasification: Is there really a maximum reaction rate?," Applied Energy, Elsevier, vol. 124(C), pages 73-81.
    3. Chen, Chih-Jung & Hung, Chen-I. & Chen, Wei-Hsin, 2012. "Numerical investigation on performance of coal gasification under various injection patterns in an entrained flow gasifier," Applied Energy, Elsevier, vol. 100(C), pages 218-228.
    4. Jeong, Hyo Jae & Seo, Dong Kyun & Hwang, Jungho, 2014. "CFD modeling for coal size effect on coal gasification in a two-stage commercial entrained-bed gasifier with an improved char gasification model," Applied Energy, Elsevier, vol. 123(C), pages 29-36.
    Full references (including those not matched with items on IDEAS)

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as


    Cited by:

    1. Zeng, Guang & Xu, Mingchen & Tu, Yaojie & Li, Zhenwei & Cai, Yongtie & Zheng, Zhimin & Tay, Kunlin & Yang, Wenming, 2020. "Influences of initial coal concentration on ignition behaviors of low-NOx bias combustion technology," Applied Energy, Elsevier, vol. 278(C).
    2. Qiao, Yanyu & Li, Song & Jing, Xinjing & Chen, Zhichao & Fan, Subo & Li, Zhengqi, 2022. "Combustion and NOx formation characteristics from a 330 MWe retrofitted anthracite-fired utility boiler with swirl burner under deeply-staged-combustion," Energy, Elsevier, vol. 258(C).
    3. Ling, Zhongqian & Ling, Bo & Kuang, Min & Li, Zhengqi & Lu, Ye, 2017. "Comparison of airflow, coal combustion, NOx emissions, and slagging characteristics among three large-scale MBEL down-fired boilers manufactured at different times," Applied Energy, Elsevier, vol. 187(C), pages 689-705.
    4. Liu, Yacheng & Fan, Weidong & Li, Yu, 2016. "Numerical investigation of air-staged combustion emphasizing char gasification and gas temperature deviation in a large-scale, tangentially fired pulverized-coal boiler," Applied Energy, Elsevier, vol. 177(C), pages 323-334.
    5. Kuang, Min & Yang, Guohua & Zhu, Qunyi & Ti, Shuguang & Wang, Zhenfeng, 2017. "Effect of burner location on flow-field deflection and asymmetric combustion in a 600MWe supercritical down-fired boiler," Applied Energy, Elsevier, vol. 206(C), pages 1393-1405.
    6. Li, Zixiang & Miao, Zhengqing & Shen, Xusheng & Li, Jiangtao, 2018. "Effects of momentum ratio and velocity difference on combustion performance in lignite-fired pulverized boiler," Energy, Elsevier, vol. 165(PA), pages 825-839.
    7. Li, Zixiang & Qiao, Xinqi & Miao, Zhengqing, 2021. "A novel burner arrangement scheme with annularly combined multiple airflows for wall-tangentially fired pulverized coal boiler," Energy, Elsevier, vol. 222(C).
    8. Li, Zixiang & Qiao, Xinqi & Miao, Zhengqing, 2021. "Low load performance of tangentially-fired boiler with annularly combined multiple airflows," Energy, Elsevier, vol. 224(C).
    9. Wu, Xiaofeng & Fan, Weidong & Liu, Yacheng & Bian, Bao, 2019. "Numerical simulation research on the unique thermal deviation in a 1000 MW tower type boiler," Energy, Elsevier, vol. 173(C), pages 1006-1020.
    10. Bashtani, Javad & Seddighi, Sadegh & Bahrabadi-Jovein, Iman, 2018. "Control of nitrogen oxide formation in power generation using modified reaction kinetics and mixing," Energy, Elsevier, vol. 145(C), pages 567-581.
    11. Liu, Mingyu & Chen, Sheng & Zhu, Hongwei & Zhou, Zijian & Xu, Jingying, 2023. "Numerical investigation of ammonia/coal co-combustion in a low NOx swirl burner," Energy, Elsevier, vol. 282(C).
    12. Li, Zixiang & Miao, Zhengqing, 2019. "Primary air ratio affects coal utilization mode and NOx emission in lignite pulverized boiler," Energy, Elsevier, vol. 187(C).
    13. Yiwei Wang & Yuan Wang & Sunhua Deng & Qiang Li & Jingjing Gu & Haoche Shui & Wei Guo, 2022. "Numerical Simulation Analysis of Heating Effect of Downhole Methane Catalytic Combustion Heater under High Pressure," Energies, MDPI, vol. 15(3), pages 1-23, February.
    14. Liang, Zhanwei & Chen, Hongwei & Zhao, Bin & Jia, Jiandong & Cheng, Kai, 2018. "Synergetic effects of firing gases/coal blends and adopting deep air staging on combustion characteristics," Applied Energy, Elsevier, vol. 228(C), pages 499-511.
    15. Yin, Chungen, 2017. "Prediction of air-fuel and oxy-fuel combustion through a generic gas radiation property model," Applied Energy, Elsevier, vol. 189(C), pages 449-459.
    16. Rahimipetroudi, Iman & Rashid, Kashif & Yang, Je Bok & Dong, Sang Keun, 2021. "Development of environment-friendly dual fuel pulverized coal-natural gas combustion technology for the co-firing power plant boiler: Experimental and numerical analysis," Energy, Elsevier, vol. 228(C).

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Liu, Yacheng & Fan, Weidong & Li, Yu, 2016. "Numerical investigation of air-staged combustion emphasizing char gasification and gas temperature deviation in a large-scale, tangentially fired pulverized-coal boiler," Applied Energy, Elsevier, vol. 177(C), pages 323-334.
    2. Bassani, Andrea & Pirola, Carlo & Maggio, Enrico & Pettinau, Alberto & Frau, Caterina & Bozzano, Giulia & Pierucci, Sauro & Ranzi, Eliseo & Manenti, Flavio, 2016. "Acid Gas to Syngas (AG2S™) technology applied to solid fuel gasification: Cutting H2S and CO2 emissions by improving syngas production," Applied Energy, Elsevier, vol. 184(C), pages 1284-1291.
    3. Adeyemi, Idowu & Janajreh, Isam & Arink, Thomas & Ghenai, Chaouki, 2017. "Gasification behavior of coal and woody biomass: Validation and parametrical study," Applied Energy, Elsevier, vol. 185(P2), pages 1007-1018.
    4. Sunel Kumar & Zhihua Wang & Yong He & Yanqun Zhu & Kefa Cen, 2022. "Numerical Analysis for Coal Gasification Performance in a Lab-Scale Gasifier: Effects of the Wall Temperature and Oxygen/Coal Ratio," Energies, MDPI, vol. 15(22), pages 1-15, November.
    5. Xu, Shisen & Ren, Yongqiang & Wang, Baomin & Xu, Yue & Chen, Liang & Wang, Xiaolong & Xiao, Tiancun, 2014. "Development of a novel 2-stage entrained flow coal dry powder gasifier," Applied Energy, Elsevier, vol. 113(C), pages 318-323.
    6. Ramos, Ana & Monteiro, Eliseu & Rouboa, Abel, 2019. "Numerical approaches and comprehensive models for gasification process: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 110(C), pages 188-206.
    7. Chen, Wei-Hsin & Chen, Chih-Jung & Hung, Chen-I & Shen, Cheng-Hsien & Hsu, Heng-Wen, 2013. "A comparison of gasification phenomena among raw biomass, torrefied biomass and coal in an entrained-flow reactor," Applied Energy, Elsevier, vol. 112(C), pages 421-430.
    8. Li, Fenghai & Li, Zhenzhu & Huang, Jiejie & Fang, Yitian, 2014. "Understanding mineral behaviors during anthracite fluidized-bed gasification based on slag characteristics," Applied Energy, Elsevier, vol. 131(C), pages 279-287.
    9. Wu, Zhiqiang & Yang, Wangcai & Meng, Haiyu & Zhao, Jun & Chen, Lin & Luo, Zhengyuan & Wang, Shuzhong, 2017. "Physicochemical structure and gasification reactivity of co-pyrolysis char from two kinds of coal blended with lignocellulosic biomass: Effects of the carboxymethylcellulose sodium," Applied Energy, Elsevier, vol. 207(C), pages 96-106.
    10. Lee, Jechan & Yang, Xiao & Cho, Seong-Heon & Kim, Jae-Kon & Lee, Sang Soo & Tsang, Daniel C.W. & Ok, Yong Sik & Kwon, Eilhann E., 2017. "Pyrolysis process of agricultural waste using CO2 for waste management, energy recovery, and biochar fabrication," Applied Energy, Elsevier, vol. 185(P1), pages 214-222.
    11. Zeng, Guang & Zhou, Anqi & Fu, Jinming & Ji, Yang, 2022. "Experimental and numerical investigations on NOx formation and reduction mechanisms of pulverized-coal stereo-staged combustion," Energy, Elsevier, vol. 261(PB).
    12. Rizkiana, Jenny & Guan, Guoqing & Widayatno, Wahyu Bambang & Hao, Xiaogang & Li, Xiumin & Huang, Wei & Abudula, Abuliti, 2014. "Promoting effect of various biomass ashes on the steam gasification of low-rank coal," Applied Energy, Elsevier, vol. 133(C), pages 282-288.
    13. Gomez, Arturo & Mahinpey, Nader, 2015. "A new model to estimate CO2 coal gasification kinetics based only on parent coal characterization properties," Applied Energy, Elsevier, vol. 137(C), pages 126-133.
    14. Dai, C. & Cai, X.H. & Cai, Y.P. & Huang, G.H., 2014. "A simulation-based fuzzy possibilistic programming model for coal blending management with consideration of human health risk under uncertainty," Applied Energy, Elsevier, vol. 133(C), pages 1-13.
    15. Yang, Jie & Ma, Liping & Yang, Jing & Liu, Hongpan & Liu, Shengyu & Yang, Yingchun & Mu, Liusen & Wei, Yi & Ao, Ran & Guo, Zhiying & Dai, Quxiu & Wang, Huiming, 2019. "Thermodynamic and kinetic analysis of CuO-CaSO4 oxygen carrier in chemical looping gasification," Energy, Elsevier, vol. 188(C).
    16. Watanabe, Hiroaki & Ahn, Seongyool & Tanno, Kenji, 2017. "Numerical investigation of effects of CO2 recirculation in an oxy-fuel IGCC on gasification characteristics of a two-stage entrained flow coal gasifier," Energy, Elsevier, vol. 118(C), pages 181-189.
    17. Ku, Xiaoke & Wang, Jin & Jin, Hanhui & Lin, Jianzhong, 2019. "Effects of operating conditions and reactor structure on biomass entrained-flow gasification," Renewable Energy, Elsevier, vol. 139(C), pages 781-795.
    18. Wang, Kangcheng & Zhang, Jie & Shang, Chao & Huang, Dexian, 2021. "Operation optimization of Shell coal gasification process based on convolutional neural network models," Applied Energy, Elsevier, vol. 292(C).
    19. He, Qing & Gong, Yan & Ding, Lu & Guo, Qinghua & Yoshikawa, Kunio & Yu, Guangsuo, 2021. "Reactivity prediction and mechanism analysis of raw and demineralized coal char gasification," Energy, Elsevier, vol. 229(C).
    20. P, Ramakrishnan & Singh, Jagadish Kumar & Sahoo, Abanti & Mohapatra, Soumya Sanjeeb, 2023. "CFD simulation for coal gasification in fluidized bed gasifier," Energy, Elsevier, vol. 281(C).

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:eee:appene:v:164:y:2016:i:c:p:258-267. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Catherine Liu (email available below). General contact details of provider: http://www.elsevier.com/wps/find/journaldescription.cws_home/405891/description#description .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.