烟气烘焙对玉米秆可磨性的影响规律研究

doi:10.11949/0438-1157.20221270

摘要/Abstract

摘要：

可磨性是生物质在现有燃煤机组规模化燃烧利用中必须考虑的问题之一。本文基于固定床反应器对玉米秆进行烘焙预处理，针对生物质单烧和与煤混烧两种技术路线，利用臼式研磨仪、全自动粒径筛分仪、纤维素分析仪和傅里叶红外光谱，研究了不同烘焙气氛、温度对燃料可磨性的影响。结果表明，相比于氮气，烟气能够在更低的烘焙温度下使玉米秆可磨性提升至接近于典型动力用煤，主要是由于烟气中的氧化性组分促进了纤维素、半纤维素的分解。当共磨时，煤颗粒表现出助磨的作用提升了玉米秆的可磨性，在较高温度或烟气烘焙条件下，混样的可磨性近似甚至优于煤。

关键词: 烘焙, 可磨性, 玉米秆, 干烟气, 湿烟气

Abstract:

Grindability is one of the issues that must be considered in the large-scale combustion of biomass in existing coal-fired units. Corn stalk was torrefied in a fixed-bed reactor at various conditions. Aiming at biomass single burning and mixed burning with coal, the effects of torrefied atmosphere, temperature on the grindability of fuel were investigated via the mortar grinder, the automatic particle size sieving instrument, the cellulose analyzer, and the Fourier transform infrared spectroscopy. The results showed that compared with torrefaction with nitrogen atmosphere, torrefaction with flue gas atmosphere improved the grindability of corn stalk to be close to that of typical power coal at lower torrefied temperature. This is because the oxidizing components in the flue gas promote the decomposition of cellulose and hemicellulose. When co-grinding, the coal particles showed the role of grinding aid to improve the grindability of corn stalks. The grindability of mixed samples was approximately or even better than that of coal at higher temperatures or flue gas torrefaction condition.

Key words: torrefaction, grindability, corn stalk, dry flue gas, wet flue gas

中图分类号:

TK 6

王绍壮, 于敦喜, 李佳忆, 韩京昆, 喻鑫, 刘芳琪. 烟气烘焙对玉米秆可磨性的影响规律研究[J]. 化工学报, 2023, 74(2): 861-870.

Shaozhuang WANG, Dunxi YU, Jiayi LI, Jingkun HAN, Xin YU, Fangqi LIU. Effects of torrefaction with flue gas on grindability of corn stalk[J]. CIESC Journal, 2023, 74(2): 861-870.

图/表 9

表1 样品的工业分析、元素分析和发热量

Table 1 Proximate analysis， ultimate analysis and calorific value of samples

样品	工业分析/%（质量，ad）				元素分析/%（质量，ad）					HHV/ (MJ·kg^-1)
样品	M	V	A	FC	C	H	N	S	O^①	HHV/ (MJ·kg^-1)
SY煤	9.17	28.60	11.73	50.49	62.73	4.02	1.33	0.23	10.79	23.58
CS	12.06	62.71	7.52	17.71	42.33	5.35	2.02	0.20	30.53	14.37
N₂-240	3.00	60.02	17.85	19.13	43.92	5.04	1.99	0.10	28.11	15.94
N₂-270	2.92	55.61	19.77	21.71	45.84	4.68	2.01	0.09	24.70	16.97
N₂-300	2.87	37.32	24.18	35.16	54.57	4.08	2.32	0.10	11.87	19.86
DFG-240	2.94	53.51	18.13	25.42	48.15	4.69	2.01	0.09	23.99	18.86
DFG-270	2.87	35.83	22.32	38.77	53.35	3.82	2.35	0.11	15.18	19.20
DFG-300	2.80	30.02	25.24	41.94	55.23	3.45	2.51	0.12	10.65	19.70
WFG-240	2.71	52.12	19.72	22.31	48.55	4.48	1.48	0.05	23.02	18.91
WFG-270	2.19	34.31	24.53	38.96	54.42	3.84	1.81	0.07	13.14	20.52
WFG-300	2.10	27.39	28.02	42.49	56.25	3.62	1.87	0.09	8.06	20.86

图1 SY煤、玉米秆原样及烘焙样的范氏图

Fig.1 The van Krevelen diagram of SY coal, raw and torrefied corn stalk

图2 烘焙玉米秆的质量产率和能量产率

Fig.2 Mass yield and energy yield of torrefied corn stalk

图3 煤与烘焙前后玉米秆单独研磨粒径分布[(a), (b), (c)为不同烘焙气氛影响对照; (d), (e), (f)为不同烘焙温度影响对照]

Fig.3 Particle size distribution of separate grinding coal, raw and torrefied corn stalk[(a), (b), (c) and (d), (e), (f) reaction condition was different torrefied atmosphere and temperature]

图4 煤与烘焙前后玉米秆共磨粒径分布[(a), (b), (c)为不同烘焙气氛影响对照; (d), (e), (f)为不同烘焙温度影响对照]

Fig.4 Particle size distribution of mixed grinding coal, raw and torrefied corn stalk[(a), (b), (c) and (d), (e), (f) reaction condition was different torrefied atmosphere and temperature]

图5 煤与烘焙前后玉米秆不同混合比例下共磨粒径分布[(a), (b), (c)(d), (e)(f)分别为原样、氮气烘焙样、干烟气烘焙样、湿烟气烘焙样与煤不同混合比例影响对照]

Fig.5 Particle size distribution of mixed grinding coal, raw and torrefied corn stalk in different mixing ratio[(a), (b), (c)(d), (e)(f) reaction condition was different mixing ratio]

图6 煤与烘焙玉米秆研磨的R90和R200[(a)(b), (c)(d)分别为煤与烘焙玉米秆研磨的R90和R200]

Fig.6 R90 and R200 of grinding coal, raw and torrefied corn stalk[(a)(b), (c)(d) reaction condition was R90 and R200 of samples]

图7 玉米秆原样及烘焙样的三大组分含量

Fig.7 Content of three components of raw and torrefied corn stalk

图8 不同烘焙工况下样品的傅里叶红外光谱

Fig.8 FTIR result of samples under different torrefied condition

参考文献 34

1	Bach Q V, Skreiberg Ø. Upgrading biomass fuels via wet torrefaction: a review and comparison with dry torrefaction[J]. Renewable and Sustainable Energy Reviews, 2016, 54: 665-677.
2	郑丁乾, 田善君, 马思宁, 等. 基于空间分析方法的我国燃煤耦合生物质发电潜力分析[J]. 洁净煤技术, 2022, 28(6): 35-43.
	Zheng D Q, Tian S J, Ma S N, et al. Potential analysis of coal-biomass co-firing power generation in China based on a spatial analysis method[J]. Clean Coal Technology, 2022, 28(6): 35-43.
3	Rokni E, Panahi A, Ren X H, et al. Curtailing the generation of sulfur dioxide and nitrogen oxide emissions by blending and oxy-combustion of coals[J]. Fuel, 2016, 181: 772-784.
4	Manzano-Agugliaro F, Alcayde A, Montoya F G, et al. Scientific production of renewable energies worldwide: an overview[J]. Renewable and Sustainable Energy Reviews, 2013, 18: 134-143.
5	辛保安, 单葆国, 李琼慧, 等. “双碳”目标下“能源三要素”再思考[J]. 中国电机工程学报, 2022, 42(9): 3117-3126.
	Xin B A, Shan B G, Li Q H, et al. Rethinking of the “three elements of energy” toward carbon peak and carbon neutrality[J]. Proceedings of the CSEE, 2022, 42(9): 3117-3126.
6	Chen W H, Peng J H, Bi X T. A state-of-the-art review of biomass torrefaction, densification and applications[J]. Renewable and Sustainable Energy Reviews, 2015, 44: 847-866.
7	Cahyanti M N, Doddapaneni T R K, Kikas T. Biomass torrefaction: an overview on process parameters, economic and environmental aspects and recent advancements[J]. Bioresource Technology, 2020, 301: 122737.
8	Chen W H, Kuo P C. A study on torrefaction of various biomass materials and its impact on lignocellulosic structure simulated by a thermogravimetry[J]. Energy, 2010, 35(6): 2580-2586.
9	Bach Q V, Chen W H. Pyrolysis characteristics and kinetics of microalgae via thermogravimetric analysis (TGA): a state-of-the-art review[J]. Bioresource Technology, 2017, 246: 88-100.
10	He C, Tang C Y, Li C H, et al. Wet torrefaction of biomass for high quality solid fuel production: a review[J]. Renewable and Sustainable Energy Reviews, 2018, 91: 259-271.
11	Deng J, Wang G J, Kuang J H, et al. Pretreatment of agricultural residues for co-gasification via torrefaction[J]. Journal of Analytical and Applied Pyrolysis, 2009, 86(2): 331-337.
12	Shankar Tumuluru J, Sokhansanj S, Hess J R, et al. A review on biomass torrefaction process and product properties for energy applications[J]. Industrial Biotechnology, 2011, 7(5): 384-401.
13	Wang C W, Peng J H, Li H, et al. Oxidative torrefaction of biomass residues and densification of torrefied sawdust to pellets[J]. Bioresource Technology, 2013, 127: 318-325.
14	Mei Y Y, Liu R J, Yang Q, et al. Torrefaction of cedarwood in a pilot scale rotary kiln and the influence of industrial flue gas[J]. Bioresource Technology, 2015, 177: 355-360.
15	Onsree T, Tippayawong N, Williams T, et al. Torrefaction of pelletized corn residues with wet flue gas[J]. Bioresource Technology, 2019, 285: 121330.
16	Su Y H, Zhang S P, Liu L Q, et al. Investigation of representative components of flue gas used as torrefaction pretreatment atmosphere and its effects on fast pyrolysis behaviors[J]. Bioresource Technology, 2018, 267: 584-590.
17	杜一帆. 非惰性气氛烘焙稻壳与煤的混燃特性研究[D]. 武汉: 华中科技大学, 2017.
	Du Y F. Investigation of co-combustion characteristics of non-inert torrefied rice husk and coal[D]. Wuhan: Huazhong University of Science and Technology, 2017.
18	Lasek J A, Kopczyński M, Janusz M, et al. Combustion properties of torrefied biomass obtained from flue gas-enhanced reactor[J]. Energy, 2017, 119: 362-368.
19	Chen W H, Lin B J, Lin Y Y, et al. Progress in biomass torrefaction: principles, applications and challenges[J]. Progress in Energy and Combustion Science, 2021, 82: 100887.
20	孟春霖, 颜莹莹, 梁远, 等. 关于污泥火电厂协同焚烧的控制性指标的思考和建议[J]. 中国给水排水, 2021, 37(14): 46-55.
	Meng C L, Yan Y Y, Liang Y, et al. Thinking and suggestion on the control index of sludge co-incineration in thermal power plant[J]. China Water and Wastewater, 2021, 37(14): 46-55.
21	Tumuluru J S, Wright C T, Hess J R, et al. A review of biomass densification systems to develop uniform feedstock commodities for bioenergy application[J]. Biofuels, Bioproducts and Biorefining, 2011, 5(6): 683-707.
22	Manouchehrinejad M, van Giesen I, Mani S. Grindability of torrefied wood chips and wood pellets[J]. Fuel Processing Technology, 2018, 182: 45-55.
23	Sakuragi K, Otaka M. Milling characteristics of coal and torrefied biomass blends in a roller mill[J]. ACS Omega, 2021, 6(44): 29814-29819.
24	赵振伟, 陈雷, 伊晓路, 等. 烘焙提升纤维素类生物质热解气化性能的研究进展[J]. 化工进展, 2021, 40(5): 2509-2516.
	Zhao Z W, Chen L, Yi X L, et al. Research advances in improvement of cellulosic biomass pyrolysis/gasification process by torrefaction[J]. Chemical Industry and Engineering Progress, 2021, 40(5): 2509-2516.
25	van der Stelt M J C, Gerhauser H, Kiel J H A, et al. Biomass upgrading by torrefaction for the production of biofuels: a review[J]. Biomass and Bioenergy, 2011, 35(9): 3748-3762.
26	Chen W H, Lu K M, Liu S H, et al. Biomass torrefaction characteristics in inert and oxidative atmospheres at various superficial velocities[J]. Bioresource Technology, 2013, 146: 152-160.
27	Uemura Y, Omar W, Othman N A, et al. Torrefaction of oil palm EFB in the presence of oxygen[J]. Fuel, 2013, 103: 156-160.
28	Zhao Z, Feng S, Zhao Y Y, et al. Investigation on the fuel quality and hydrophobicity of upgraded rice husk derived from various inert and oxidative torrefaction conditions[J]. Renewable Energy, 2022, 189: 1234-1248.
29	Dobó Z, Fry A. Investigation of co-milling Utah bituminous coal with prepared woody biomass materials in a Raymond Bowl Mill[J]. Fuel, 2018, 222: 343-349.
30	Rousset P, Aguiar C, Labbé N, et al. Enhancing the combustible properties of bamboo by torrefaction[J]. Bioresource Technology, 2011, 102(17): 8225-8231.
31	Sher F, Yaqoob A, Saeed F, et al. Torrefied biomass fuels as a renewable alternative to coal in co-firing for power generation[J]. Energy, 2020, 209: 118444.
32	Nhuchhen D, Basu P, Acharya B. A comprehensive review on biomass torrefaction[J]. International Journal of Renewable Energy and Biofuels, 2014: 1-56.
33	Zhang L, Wang Z Z, Ma J, et al. Analysis of functionality distribution and microstructural characteristics of upgraded rice husk after undergoing non-oxidative and oxidative torrefaction[J]. Fuel, 2022, 310: 122477.
34	Chen D Y, Cen K H, Cao X B, et al. Restudy on torrefaction of corn stalk from the point of view of deoxygenation and decarbonization[J]. Journal of Analytical and Applied Pyrolysis, 2018, 135: 85-93.

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