Influence of mass air flow ratio on gas-particle flow characteristics of a swirl burner in a 29 MW pulverized coal boiler

doi:10.1007/s11708-020-0697-9

Front. Energy

2021, Vol. 15

Issue (1) : 68-77 https://doi.org/10.1007/s11708-020-0697-9

RESEARCH ARTICLE

Influence of mass air flow ratio on gas-particle flow characteristics of a swirl burner in a 29 MW pulverized coal boiler

Rong YAN, Zhichao CHEN(

), Shuo GUAN, Zhengqi LI

School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Download: PDF(2429 KB) HTML
Export: BibTeX | EndNote | Reference Manager | ProCite | RefWorks

Abstract

In a gas/particle two-phase test facility, a three-component particle-dynamics anemometer was used to measure the characteristics of gas/particle two-phase flows in a 29 megawatt (MW) pulverized coal industrial boiler equipped with a new type of swirling pulverized coal burner. The distributions of three-dimensional gas/particle velocity, particle volume flux, and particle size distribution were measured under different working conditions. The mean axial velocity and the particle volume flux in the central region of the burner outlet were found to be negative. This indicated that a central recirculation zone was formed in the center of the burner. In the central recirculation zone, the absolute value of the mean axial velocity and the particle volume flux increased when the external secondary air volume increased. The size of the central reflux zone remained stable when the air volume ratio changed. Along the direction of the jet, the peak value formed by the tertiary air gradually moved toward the center of the burner. This tertiary air was mixed with the peak value formed by the air in the adiabatic combustion chamber after the cross-section of x/d = 0.7. Large particles were concentrated near the wall area, and the particle size in the recirculation zone was small.

Keywords industrial pulverized coal boiler swirl burner air/particle flow particle dynamic analyzer (PDA)

Corresponding Author(s): Zhichao CHEN

Online First Date: 04 September 2020 Issue Date: 19 March 2021

Cite this article:

Rong YAN,Zhichao CHEN,Shuo GUAN, et al. Influence of mass air flow ratio on gas-particle flow characteristics of a swirl burner in a 29 MW pulverized coal boiler[J]. Front. Energy, 2021, 15(1): 68-77.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-020-0697-9
https://academic.hep.com.cn/fie/EN/Y2021/V15/I1/68

Fig.1 Geometric dimensions of the swirling burner in the pulverized coal industrial boiler.

Fig.2 Air/particle test facility.

Fig.3 Particle size distribution.

Fig.4 Schematic diagram of PDA measurement system.

Tab.1 Cold-flow experimental parameters at the four different mass-flow ratios of secondary and tertiary air

Fig.5 Profiles of the mean axial velocities for air and particles at the four mass-flow ratios of secondary and tertiary air.

Fig.6 Profiles of the RMS axial fluctuation velocities for air and particles at the four mass-flow ratios of secondary and tertiary air.

Fig.7 Profiles of the mean tangential velocities for air and particles at the four mass-flow ratios of secondary and tertiary air.

Fig.8 Profiles of the RMS tangential fluctuation velocities for air and particles at the four mass-flow ratios of secondary and tertiary air.

Fig.9 Profiles of the mean radial velocities for air and particles at the four mass-flow ratios of secondary and tertiary air.

Fig.10 Profiles of the RMS radial fluctuation velocities for air and particles at the four mass-flow ratios of secondary and tertiary air.

Fig.11 Mean diameter of particles at the four mass-flow ratios of secondary and tertiary air.

Fig.12 Particle volume flux profiles at the four mass-flow ratios of secondary and tertiary air.

1	J Yu. Status and transformation measures of industrial coal-fired boiler in China. Clean Coal Technology, 2012, 18(03): 89–91 (in Chinese)
2	R S Ji, N J Wang, C W Xiao, Y G Wang. The situations and application of efficient pulverized coal fired industrial boiler technique. Clean Coal Technology, 2009, 15(05): 52–56 (in Chinese)
3	J K Feng. Experience of industrial boilers burning pulverized coal. Boiler Technology, 1989, 11: 9–11 (in Chinese)
4	M Costa, J L T Azevedo, M G Carvalho. Combustion characteristics of a front-wall-fired pulverized coal 300 MWe utility boiler. Combustion Science and Technology, 1997, 129(1): 277–293 https://doi.org/10.1080/00102209708935729
5	M Costa, P Silva, J L T Azevedo. Measurements of gas species, temperature, and char burnout in a low-NOx pulverized coal-fired utility boiler. Combustion Science and Technology, 2003, 175(2): 271–289 https://doi.org/10.1080/00102200302404
6	A Vikhansky, E Barziv, B Chudnovsky, A Talanker, E Eddings, A Sarofim. Measurements and numerical simulations for optimization of the combustion process in a utility boiler. International Journal of Energy Research, 2004, 28(5): 391–401 https://doi.org/10.1002/er.971
7	T Tsumura, H Okazaki, P Dernjatin, K Savolainen. Reducing the minimum load and NOx emissions for lignite-fired boiler by applying a stable-flame concept. Applied Energy, 2003, 74(3-4): 415–424 https://doi.org/10.1016/S0306-2619(02)00196-4
8	Z Qi Li, R Sun, Z X Wan, S Z Sun, S H Wu, L Z Chen. Gas-particle flow and combustion in the near-burner zone of the swirl-stabilized pulverized coal burner. Combustion Science and Technology, 2003, 175(11): 1979–2014 https://doi.org/10.1080/714923184
9	S Xue, S E Hui, T S Liu, Q Zhou, T Xu, H Hu. Experimental investigation on NOx emission and carbon burnout from a radially biased pulverized coal swirl burner. Fuel Processing Technology, 2009, 90(9): 1142–1147 https://doi.org/10.1016/j.fuproc.2009.05.011
10	Z Q Li, J P Jing, G K Liu, Z Chen, C Liu. Measurement of gas species, temperatures, char burnout, and wall heat fluxes in a 200-MWe lignite-fired boiler at different loads. Applied Energy, 2010, 87(4): 1217–1230 https://doi.org/10.1016/j.apenergy.2009.05.035
11	S Li, Z Q Li, B K Jiang, Z Chen, X Zhang. Effect of secondary air mass flow rate on the airflow and combustion characteristics and NOx formation of the low-volatile coal-fired swirl burner. Asia-Pacific Journal of Chemical Engineering, 2015, 10(6): 858–875 https://doi.org/10.1002/apj.1923
12	M Sommerfeld, H Qiu. Characterization of particle-laden, confined swirling flows by phase-doppler anemometry and numerical calculation. International Journal of Multiphase Flow, 1993, 19(6): 1093–1127 https://doi.org/10.1016/0301-9322(93)90080-E
13	J P Jing, Z Q Li, L Wang, Z Chen, L Chen, F Zhang. Influence of the mass flow rate of secondary air on the gas/particle flow characteristics in the near-burner region of a double swirl flow burner. Chemical Engineering Science, 2011, 66(12): 2864–2871 https://doi.org/10.1016/j.ces.2011.03.051
14	H Zhou, Y Yang, K Dong, H Liu, Y Shen, K Cen. Influence of the gas particle flow characteristics of a low-NOx swirl burner on the formation of high temperature corrosion. Fuel, 2014, 134: 595–602 https://doi.org/10.1016/j.fuel.2014.06.027
15	Q X Wang, Z C Chen, Q W Chen, L Zeng, Z Li. Experimental investigation of gas/particle two-phase flow characteristics in a down-fired boiler by PDA measurements. Experimental Thermal and Fluid Science, 2019, 107: 38–53 https://doi.org/10.1016/j.expthermflusci.2019.05.014
16	Z Q Li, Z X Wan, R Su, S Z Sun, L Z Chen, S H Wu, Y K Qin. Influence of division cone angles between the fuel-rich and the fuel-lean ducts on gas-particle flow and combustion near swirl burners. Energy, 2002, 27(12): 1119–1130 https://doi.org/10.1016/S0360-5442(02)00083-X
17	Z C Chen, Z Q Li, Q Y Zhu, J Jing. Gas/particle flow and combustion characteristics and NOx emissions of a new swirl coal burner. Energy, 2011, 36(2): 709–723 https://doi.org/10.1016/j.energy.2010.12.037
18	M Kuang, Z Li, Q Zhu, Y Wang, L Chen, Y Zhang. Experimental gas/particle flow characteristics of a down-fired 600 MWe supercritical utility boiler at different staged-air ratios. Energy, 2012, 42(1): 411–423 https://doi.org/10.1016/j.energy.2012.03.027
19	N Fang, Z Q Li, J Q Wang, B Zhang, L Zeng, Z Chen, H Wang, X Liu, X Zhang. Experimental investigations on air/particle flow characteristics in a 2000 t/d GSP pulverized coal gasifier with an improved burner. Energy, 2018, 165: 432–441 https://doi.org/10.1016/j.energy.2018.10.005
20	L Y Zeng, Z Q Li, G B Zhao, J Li, F Zhang, S Shen, L Chen. The influence of swirl burner structure on the gas/particle flow characteristics. Energy, 2011, 36(10): 6184–6194 https://doi.org/10.1016/j.energy.2011.07.044
21	F Ren, Z Q Li, Z C Chen, Z Xu, G Yang. Experimental investigations into gas/particle flows in a down-fired boiler: influence of the vent air ratio. Energy & Fuels, 2010, 24(3): 1592–1602 https://doi.org/10.1021/ef901243c

Viewed

Full text

Abstract

Cited

Shared

Discussed