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On-line Access: 2024-08-27

Received: 2023-10-17

Revision Accepted: 2024-05-08

Crosschecked: 2021-01-10

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Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Zhong-yang Luo

https://orcid.org/0000-0001-8764-2986

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Journal of Zhejiang University SCIENCE A 2021 Vol.22 No.2 P.116-129

http://doi.org/10.1631/jzus.A2000039


Behavior of alkali minerals in oxyfuel co-combustion of biomass and coal at elevated pressure


Author(s):  Oris Chansa, Zhong-yang Luo, Wen-nan Zhang, Chun-jiang Yu

Affiliation(s):  The State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China; more

Corresponding email(s):   zyluo@zju.edu.cn

Key Words:  Oxyfuel co-combustion, Equilibrium calculations, Chemical kinetic reactions, Mineral’, s identifications, Thermogravimetric combustion


Oris Chansa, Zhong-yang Luo, Wen-nan Zhang, Chun-jiang Yu. Behavior of alkali minerals in oxyfuel co-combustion of biomass and coal at elevated pressure[J]. Journal of Zhejiang University Science A, 2021, 22(2): 116-129.

@article{title="Behavior of alkali minerals in oxyfuel co-combustion of biomass and coal at elevated pressure",
author="Oris Chansa, Zhong-yang Luo, Wen-nan Zhang, Chun-jiang Yu",
journal="Journal of Zhejiang University Science A",
volume="22",
number="2",
pages="116-129",
year="2021",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A2000039"
}

%0 Journal Article
%T Behavior of alkali minerals in oxyfuel co-combustion of biomass and coal at elevated pressure
%A Oris Chansa
%A Zhong-yang Luo
%A Wen-nan Zhang
%A Chun-jiang Yu
%J Journal of Zhejiang University SCIENCE A
%V 22
%N 2
%P 116-129
%@ 1673-565X
%D 2021
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2000039

TY - JOUR
T1 - Behavior of alkali minerals in oxyfuel co-combustion of biomass and coal at elevated pressure
A1 - Oris Chansa
A1 - Zhong-yang Luo
A1 - Wen-nan Zhang
A1 - Chun-jiang Yu
J0 - Journal of Zhejiang University Science A
VL - 22
IS - 2
SP - 116
EP - 129
%@ 1673-565X
Y1 - 2021
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A2000039


Abstract: 
Combustion of biomass or coal is known to yield aerosols and condensed alkali minerals that affect boiler heat transfer performance. In this work, alkali behavior in the pressurized oxyfuel co-combustion of coal and biomass is predicted by thermodynamic and chemical kinetic calculations. Existence of solid minerals is evaluated by X-ray diffraction (XRD) analysis of ashes from pressure thermogravimetric combustion. Results indicate that a rise in pressure affects solid alkali minerals negligibly, but increases their contents in the liquid phase and decreases them in the gas phase, especially below 900 °C. Thus, less KCl will condense on the boiler heat transfer surfaces leading to reduced corrosion. Increasing the blend ratio of biomass to coal will raise the content of potassium-based minerals but reduce the sodium-based ones. The alkali-associated slagging in the boiler can be minimized by the synergistic effect of co-combustion of sulphur-rich coal and potassium-rich biomass, forming stable solid K2SO4 at typical fluidized bed combustion temperatures. Kinetics modelling based on reaction mechanisms shows that oxidation of SO2 to SO3 plays a major role in K2SO4 formation but that the contribution of this oxidation decreases with increase in pressure.

高压力下生物质和煤的氧化燃料共燃中碱矿物的行为研究

目的:生物质或煤的燃烧会产生影响锅炉传热性能的气溶胶和凝结碱矿物.本文旨在研究煤和生物质在加压氧燃料共燃条件下碱矿物的行为.
创新点:通过增加对煤的压力和与生物质混合,可以减少气溶胶KCl的排放,从而抑制锅炉热交换器的腐蚀.
结论:1. 压力升高对固体碱矿的影响可忽略不计.2. 提高生物质与煤的混合比,将提高钾基矿物质的含量,但会减少钠基矿物的含量.3. 锅炉中与碱相关的残渣可以通过富硫煤和富钾生物质的协同燃烧作用,在典型的流化床燃烧温度下形成稳定的固体K2SO4.3. 基于反应机制的动力学建模表明,在K2SO4的形成过程中,从SO2到SO3的氧化起着主要作用;但这种氧化的贡献会随着压力的增加而降低.

关键词:氧气共燃;均衡计算;化学动力学反应;矿物的鉴定;热重力燃烧

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

[1]Ager III JW, Howard CJ, 1987. Rate coefficient for the gas phase reaction of NaOH with CO2. Journal of Geophysical Research: Atmospheres, 92(D6):6675-6678.

[2]Bartolomé C, Gil A, 2013. Ash deposition and fouling tendency of two energy crops (cynara and poplar) and a forest residue (pine chips) co-fired with coal in a pulverized fuel pilot plant. Energy & Fuels, 27(10):5878-5889.

[3]Chansa O, Luo ZY, Zhang WN, et al., 2019. Forms of potassium and chlorine from oxy-fuel co-combustion of lignite coal and corn stover. Carbon Resources Conversion, 2(2):103-110.

[4]Chansa O, Luo ZY, Yu CJ, 2020. Study of the kinetic behaviour of biomass and coal during oxyfuel co-combustion. Chinese Journal of Chemical Engineering, 28(7):1796-1804

[5]Chen L, Yong SZ, Ghoniem AF, 2012. Oxy-fuel combustion of pulverized coal: characterization, fundamentals, stabilization and CFD modeling. Progress in Energy and Combustion Science, 38(2):156-214.

[6]Christensen KA, Stenholm M, Livbjerg H, 1998. The formation of submicron aerosol particles, HCl and SO2 in straw-fired boilers. Journal of Aerosol Science, 29(4):421-444.

[7]Gazzino M, Benelli G, 2008. Pressurised oxy-coal combustion rankine-cycle for future zero emission power plants: process design and energy analysis. Proceedings of ASME 2nd International Conference on Energy Sustainability Collocated with the Heat Transfer, Fluids Engineering, and 3rd Energy Nanotechnology Conferences, p.269-278.

[8]Glarborg P, Marshall P, 2005. Mechanism and modeling of the formation of gaseous alkali sulfates. Combustion and Flame, 141(1-2):22-39.

[9]Gopan A, Kumfer BM, Axelbaum RL, 2015. Effect of operating pressure and fuel moisture on net plant efficiency of a staged, pressurized oxy-combustion power plant. International Journal of Greenhouse Gas Control, 39:390-396.

[10]Hansen LA, Nielsen HP, Frandsen FJ, et al., 2000. Influence of deposit formation on corrosion at a straw-fired boiler. Fuel Processing Technology, 64(1-3):189-209.

[11]Hong J, Chaudhry G, Brisson JG, et al., 2009. Analysis of oxy-fuel combustion power cycle utilizing a pressurized coal combustor. Energy, 34(9):1332-1340.

[12]Hong J, Field R, Gazzino M, et al., 2010. Operating pressure dependence of the pressurized oxy-fuel combustion power cycle. Energy, 35(12):5391-5399.

[13]Hynes AJ, Steinberg M, Schofield K, 1984. The chemical kinetics and thermodynamics of sodium species in oxygen-rich hydrogen flames. The Journal of Chemical Physics, 80(6):2585-2597.

[14]Iisa K, Lu Y, Salmenoja K, 1999. Sulfation of potassium chloride at combustion conditions. Energy & Fuels, 13(6):1184-1190.

[15]Jokiniemi JK, Lazaridis M, Lehtinen KEJ, et al., 1994. Numerical simulation of vapour-aerosol dynamics in combustion processes. Journal of Aerosol Science, 25(3):429-446.

[16]Li B, Sun ZW, Li ZS, et al., 2013. Post-flame gas-phase sulfation of potassium chloride. Combustion and Flame, 160(5):959-969.

[17]Li GY, Wang CA, Yan Y, et al., 2016. Release and transformation of sodium during combustion of Zhundong coals. Journal of the Energy Institute, 89(1):48-56.

[18]Li HF, Yu B, Wang GX, et al., 2019. Investigation on improve ash fusion temperature (AFT) of low-AFT coal by biomass addition. Fuel Processing Technology, 191:11-19.

[19]Li RD, Kai XP, Yang TH, et al., 2014. Release and transformation of alkali metals during co-combustion of coal and sulfur-rich wheat straw. Energy Conversion and Management, 83:197-202.

[20]Liao YF, Yang G, Ma XQ, 2012. Experimental study on the combustion characteristics and alkali transformation behavior of straw. Energy & Fuels, 26(2):910-916.

[21]Liao YF, Cao YW, Chen T, et al., 2015. Experiment and simulation study on alkalis transfer characteristic during direct combustion utilization of bagasse. Bioresource Technology, 194:196-204.

[22]Liu YQ, Cheng LM, Zhao YG, et al., 2018. Transformation behavior of alkali metals in high-alkali coals. Fuel Processing Technology, 169:288-294.

[23]Munir S, Nimmo W, Gibbs BM, 2011. The effect of air staged, co-combustion of pulverised coal and biomass blends on NOx emissions and combustion efficiency. Fuel, 90(1):126-135.

[24]Pronobis M, Mroczek K, Tymoszuk M, et al., 2017. Optimisation of coal fineness in pulverised-fuel boilers. Energy, 139:655-666.

[25]Silva RB, Fragoso R, Sanches C, et al., 2014. Which chlorine ions are currently being quantified as total chlorine on solid alternative fuels? Fuel Processing Technology, 128: 61-67.

[26]Skinner T, Adams JB, Gama PT, 2006. The effect of mouth opening on the biomass and community structure of microphytobenthos in a small oligotrophic estuary. Estuarine, Coastal and Shelf Science, 70(1-2):161-168.

[27]Srinivasachar S, Helble JJ, Ham DO, et al., 1990. A kinetic description of vapor phase alkali transformations in combustion systems. Progress in Energy and Combustion Science, 16(4):303-309.

[28]Steenari BM, Lindqvist O, 1998. High-temperature reactions of straw ash and the anti-sintering additives kaolin and dolomite. Biomass and Bioenergy, 14(1):67-76.

[29]Tang YX, Luo ZY, Yu CJ, 2019. Determination of biomass-coal blending ratio by 14C measurement in co-firing flue gas. Journal of Zhejiang University-SCIENCE A (Applied Physics and Engineering), 20(7):475-486.

[30]Tillman DA, Duong D, Miller B, 2009. Chlorine in solid fuels fired in pulverized fuel boilers—sources, forms, reactions, and consequences: a literature review. Energy & Fuels, 23(7):3379-3391.

[31]Vamvuka D, Kakaras E, 2011. Ash properties and environmental impact of various biomass and coal fuels and their blends. Fuel Processing Technology, 92(3):570-581.

[32]Wang XH, Feng ZM, 2004. Biofuel use and its emission of noxious gases in rural China. Renewable and Sustainable Energy Reviews, 8(2):183-192.

[33]Weng WB, Chen S, Wu H, et al., 2018. Optical investigation of gas-phase KCl/KOH sulfation in post flame conditions. Fuel, 224:461-468.

[34]Wiinikka H, Gebart R, Boman C, et al., 2007. Influence of fuel ash composition on high temperature aerosol formation in fixed bed combustion of woody biomass pellets. Fuel, 86(1-2):181-193.

[35]Wu DY, Wang YH, Wang Y, et al., 2016. Release of alkali metals during co-firing biomass and coal. Renewable Energy, 96:91-97.

[36]Wu H, Castro M, Jensen PA, et al., 2011. Release and transformation of inorganic elements in combustion of a high-phosphorus fuel. Energy & Fuels, 25(7):2874-2886.

[37]Xue ZY, Zhong ZP, Zhang B, et al., 2017. Potassium transfer characteristics during co-combustion of rice straw and coal. Applied Thermal Engineering, 124:1418-1424.

[38]Yan KZ, Guo YX, Ma ZB, et al., 2018. Quantitative analysis of crystalline and amorphous phases in pulverized coal fly ash based on the rietveld method. Journal of Non-Crystalline Solids, 483:37-42.

[39]Yang TH, Kai XP, Sun Y, et al., 2011. The effect of coal sulfur on the behavior of alkali metals during co-firing biomass and coal. Fuel, 90(7):2454-2460.

[40]Zeng XY, Ma YT, Ma LR, 2007. Utilization of straw in biomass energy in China. Renewable and Sustainable Energy Reviews, 11(5):976-987.

[41]Zheng YJ, Jensen PA, Jensen AD, et al., 2007. Ash transformation during co-firing coal and straw. Fuel, 86(7-8):1008-1020.

[42]Zhou H, Zhou B, Li LT, et al., 2013. Experimental measurement of the effective thermal conductivity of ash deposit for high sodium coal (Zhun Dong coal) in a 300 kW test furnace. Energy & Fuels, 27(11):7008-7022.

[43]Zhou JB, Zhuang XG, Alastuey A, et al., 2010. Geochemistry and mineralogy of coal in the recently explored Zhundong large coal field in the Junggar Basin, Xinjiang province, China. International Journal of Coal Geology, 82(1-2):51-67.

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