添加剂对秸秆成型燃料燃烧特性的影响

doi:10.3969/j.issn.1673-5854.2019.01.007

Abstract

Abstract:

It was meaningful to optimize the combustion performance of biomass briquette fuel, which was the main application of biomass energy. The effects of common additives such as CaO, Ca(OH)₂, SiO₂, Al₂O₃, urea and fly ash on the release of SO₂ and NO_x during straw briquette combustion were studied. The results showed that the release of SO₂ and NO_x was decreased with increasing calcium sulfur ratio and decreasing water content. The catalytic combusion of Al₂O₃ increased the release of SO₂ and NO_x, while the sintering of straw and fly ash enhanced the heterogeneous denitrification reaction. Adding SiO₂ into briquette fuel was beneficial to the formation of calcium silicate complexes, which could reduce SO₂. And the desulfurization and denitrification effects reached the maximum when the dosage of SiO₂ was 5%. What was more, when urea was added after combustion for 15 s, the reducing gas produced by the pyrolysis of urea could decrease the release of SO₂ and NO_x. Moreover, the melting reaction and heterogeneous denitrification reaction were promoted by the increasing temperature, hindering the combustion of coke N, which greatly reduced the release of NO_x.

Key words: biomass, briquette fuel, additives, desulfurization and denitrification, sintering

CLC Number:

TQ35
TK6

Shun JI,Yongfeng QI,Meiting WANG,Ru MA,Panle GE. Effect of Additives on Combustion Characteristics of Straw Briquette Fuel[J]. Biomass Chemical Engineering, 2019, 53(1): 47-53.

Figures/Tables 9

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References 19

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样品 sample	工业分析proximate analysis(w_ad)/%				元素分析elemental analysis/%					EDX分析EDX analysis/%
样品 sample	水分 moisture	灰分 ash	挥发分 volatile	固定碳 fixed carbon	C_ad	H_ad	N_ad	S_ad	O_ad	Si	Al	Ca	Fe	Na	K	Cl
小麦秸秆 wheat straw	8.21	12.83	64.15	14.81	48.85	5.86	0.73	0.17	44.39	46.12	1.61	22.94	0.15	0	20.55	8.33

编号 No.	钙硫物质的量比 n(Ca)/n(S)	固硫剂 sulfur-fixed agent	辅助添加剂 auxiliary additives
样品1 sample 1	2	Ca(OH)₂	1%Al₂O₃
样品2 sample 2	2	Ca(OH)₂	1%SiO₂
样品3 sample 3	2	Ca(OH)₂	1%Al₂O₃, 15%水water
样品4 sample 4	2	Ca(OH)₂	1%Al₂O₃, 30%水water
样品5 sample 5	4	CaO	5%SiO₂
样品6 sample 6	4	CaO	5%粉煤灰5%fly ash
样品7 sample 7			掺混尿素(n(NH₃)/n(N)=1.5) blending urea(n(NH₃)/n(N)=1.5)
样品8 sample 8			燃烧15 s后单独加入尿素(n(NH₃)/n(N)=1.5) adding urea separately after burning 15 seconds(n(NH₃)/n(N)=1.5)
样品9 sample 9	2	CaO	燃烧15 s后单独加入尿素(n(NH₃)/n(N)=1.5) adding urea separately after burning 15 seconds(n(NH₃)/n(N)=1.5)
样品10 sample 10	4	CaO	1%/5%/10%/15% SiO₂

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Effect of Additives on Combustion Characteristics of Straw Briquette Fuel

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