生活垃圾与花生壳水热炭化物的燃烧特性研究

doi:10.3969/j.issn.1673-5854.2021.06.001

摘要/Abstract

摘要：

以生活垃圾（MSW）与花生壳（PS）共水热炭化产物的理化性质研究为切入点，采用热重分析法探究炭化物的燃烧特性及反应动力学，结果表明：炭化物在燃烧过程中出现3个失重峰，第二个失重峰的损失程度最大，超过了燃烧总失重的50%。同一炭化温度条件下，随着PS掺混占比的增加，燃烧越彻底，热重曲线逐渐偏向高温区。随着升温速率的提高，炭化物的着火温度、燃尽温度、燃烧特性指数均提高。MSW与PS混合共水热炭化的炭化物在燃烧过程中存在协同作用。生活垃圾掺混花生壳，随着炭化温度的升高（180~260℃），固定碳含量与燃烧特性指数S均先增后减，最小着火能量（E_{α_i}）先减后增。MSW与PS按质量比5∶5掺混，在220℃的条件下共炭化，升温速率为40℃/min时，其产物220MSW5PS5的燃烧特性指数最高（5.727×10^-6 min^-2·℃^-3），最小着火能量最低（89.55 kJ/mol）。

关键词: 生活垃圾, 花生壳, 共炭化, 燃烧特性, 最小着火能量

Abstract:

Based on the study of physical and chemical properties of co-hydrothermal carbonization products of municipal solid waste(MSW) and peanut shell(PS), thermogravimetry(TG) analysis was used to investigate the combustion characterstic and kinetics of co-carbonization products. The results indicated that the TG curves of co-carbonization products presented three weight loss peaks in the combustion, the lost degree of the second weightlessness peak was more than 50% of the total weightlessness. At the same co-carbonization temperature, with the increase of the proportion of peanut shells, combustion reactions were more thorough, TG curves were shifted to the high temperature side gradually. With the increase of heating rate, the ignition, the burnout temperature and the integrated combustion characteristic index improved. There existed synergistic interaction of co-carbonization products in the combustion process. With the increase of co-carbonization temperature(180-260℃), both fixed carbon content and combustion characteristic index S increased first and then decreased, the minimum ignition energy(E_{α_i}) had an opposite trend. In this study, municipal solid waste were mixed with peanut shells at mass ratio of 5:5, under the conditions of co-hydrothermal carbonization temperature 220℃, the heating rate 40℃/min, co-carbonization product had the highest combustion characteristic index(5.727×10^-6 min^-2·℃^-3) and the lowest ignition energy(89.55 kJ/mol).

Key words: municipal solid waste, peanut shell, co-carbonization, combustion characteristics, minimum ignition energy

中图分类号:

TQ35
X705

陈涛, 邢献军, 马培勇, 任琼, 张佳佳, 刘娜. 生活垃圾与花生壳水热炭化物的燃烧特性研究[J]. 生物质化学工程, 2021, 55(6): 1-9.

Tao CHEN, Xianjun XING, Peiyong MA, Qiong REN, Jiajia ZHANG, Na LIU. Combustion Characteristics of Co-hydrothermal Carbonization Products of Municipal Solid Waste and Peanut Shell[J]. Biomass Chemical Engineering, 2021, 55(6): 1-9.

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样品 samples	m(MSW)∶m(PS)	炭化物carbonization products
样品 samples	m(MSW)∶m(PS)	质量mass/g	得率yield/%
180MSW1PS0	1∶0	2.98	59.6
180MSW7PS3	7∶3	3.24	64.8
180MSW5PS5	5∶5	3.56	71.2
180MSW3PS7	3∶7	3.66	73.2
180MSW0PS1	0∶1	3.80	76.0
220MSW1PS0	1∶0	2.84	56.8
220MSW7PS3	7∶3	2.92	58.4
220MSW5PS5	5∶5	3.23	64.6
220MSW3PS7	3∶7	3.35	67.0
220MSW0PS1	0∶1	3.46	69.2
260MSW1PS0	1∶0	2.54	50.8
260MSW7PS3	7∶3	2.70	54.0
260MSW5PS5	5∶5	2.87	57.4
260MSW3PS7	3∶7	3.03	60.6
260MSW0PS1	0∶1	3.19	63.8

样品 samples	工业分析proximate analysis¹⁾/%				元素分析ultimate analysis²⁾/%					高位热值/(MJ·kg^-1) higher heating value
样品 samples	水分 moisture	挥发分 volatile	灰分 ash	固定碳 fixed carbon	C	H	N	S	O^*	高位热值/(MJ·kg^-1) higher heating value
180MSW1PS0	5.30	63.28	23.62	7.80	42.08	6.05	1.57	0.15	21.23	20.74
180MSW5PS5	5.76	68.22	17.61	8.41	46.35	5.60	1.59	0.16	22.93	21.69
180MSW0PS1	4.91	82.44	2.12	10.53	50.50	5.48	1.72	0.19	35.08	28.13
220MSW1PS0	5.72	60.75	23.79	9.74	43.51	5.56	1.53	0.16	19.73	20.93
220MSW5PS5	4.88	66.64	17.57	10.91	47.36	6.17	1.61	0.14	22.27	21.82
220MSW0PS1	5.06	81.92	2.15	10.87	54.13	5.85	1.56	0.14	31.11	28.22
260MSW1PS0	4.18	53.59	34.28	7.95	46.58	5.77	1.69	0.12	7.38	18.88
260MSW5PS5	4.61	67.61	19.64	8.14	49.95	5.86	1.71	0.15	18.08	19.77
260MSW0PS1	5.71	81.46	2.46	10.37	58.41	5.77	1.83	0.13	25.69	27.79
MSW	7.18	66.99	20.79	5.04	36.24	5.34	1.69	0.31	28.45	20.04
PS	9.62	79.38	4.36	6.64	46.39	8.11	1.70	0.27	29.55	24.21

样品 samples	升温速率/(℃·min^-1) heating rates	着火转化率α_i ignition conversion rates	T_i/℃	T_f/℃	最大燃烧速率/(%·min^-1) maximum combustion rate	平均燃烧速率/(%·min^-1) mean combustion rate	燃烧特性指数(S)/(×10^-6, min^-2·℃^-3) combustion characteristic index
	10	0.120	280.92	521.90	11.50	2.98	0.831
180MSW1PS0	20	0.130	303.94	536.13	24.79	6.50	3.253
	40	0.130	323.58	567.00	26.52	10.00	4.466
	10	0.150	282.37	518.97	12.65	3.31	1.011
180MSW5PS5	20	0.160	300.78	545.87	24.57	6.48	3.225
	40	0.160	323.80	599.81	29.00	10.24	4.721
	10	0.130	290.56	562.96	16.15	3.16	1.074
180MSW0PS1	20	0.120	309.67	559.74	29.20	6.94	3.773
	40	0.120	328.39	586.25	28.36	11.32	5.077
	10	0.080	293.81	538.92	11.02	2.81	0.667
220MSW1PS0	20	0.100	316.65	552.82	20.35	5.74	2.109
	40	0.110	336.04	600.45	22.63	9.31	3.106
	10	0.120	293.76	485.18	14.13	4.18	1.412
220MSW5PS5	20	0.100	307.76	514.91	25.89	8.00	4.245
	40	0.080	329.83	577.74	29.23	12.32	5.727
	10	0.080	296.48	517.42	14.31	3.96	1.246
220MSW0PS1	20	0.080	314.06	549.00	26.17	7.94	3.836
	40	0.080	332.01	597.48	32.44	11.42	5.625
	10	0.090	287.20	633.05	7.29	2.00	0.279
260MSW1PS0	20	0.080	305.76	621.44	14.20	4.30	1.050
	40	0.080	328.51	635.43	16.66	7.93	1.926
	10	0.080	293.51	498.83	11.83	3.93	1.083
260MSW5PS5	20	0.080	309.78	520.62	22.26	7.21	3.213
	40	0.080	332.52	590.40	27.94	11.59	4.958
	10	0.070	295.00	524.87	12.17	3.89	1.037
260MSW0PS1	20	0.060	312.08	557.80	22.38	7.46	3.073
	40	0.080	334.14	619.38	26.19	11.63	4.405

样品 samples	真实转化率α true conversion rates	E/(kJ·mol^-1)	R²	E_α=pα+q	平均着火转化率α_i average conversion rates	E_{α_i}/(kJ·mol^-1)
180MSW1PS0	0.1	85.79	0.984	E_α=236.36α+62.15	0.126	91.69
180MSW1PS0	0.2	109.42	0.997	E_α=236.36α+62.15	0.126	91.69
180MSW5PS5	0.1	78.41	0.976	E_α=208.14α+57.60	0.157	90.28
180MSW5PS5	0.2	99.23	0.958	E_α=208.14α+57.60	0.157	90.28
180MSW0PS1	0.1	83.60	0.997	E_α=188.83α+64.71	0.123	87.95
180MSW0PS1	0.2	102.49	0.983	E_α=188.83α+64.71	0.123	87.95
220MSW1PS0	0.1	103.11	0.973	E_α=215.15α+81.59	0.097	102.46
220MSW1PS0	0.2	124.63	0.969	E_α=215.15α+81.59	0.097	102.46
220MSW5PS5	0.1	89.55	0.988	E_α=187.9α+70.76	0.100	89.55
220MSW5PS5	0.2	108.34	0.992	E_α=187.9α+70.76	0.100	89.55
220MSW0PS1	0.1	92.46	0.965	E_α=110.51α+81.41	0.080	90.58
220MSW0PS1	0.2	103.51	0.979	E_α=110.51α+81.41	0.080	90.58
260MSW1PS0	0.1	106.86	0.972	E_α=203.01α+86.56	0.083	103.41
260MSW1PS0	0.2	127.16	0.987	E_α=203.01α+86.56	0.083	103.41
260MSW5PS5	0.1	94.50	0.989	E_α=120.70α+82.43	0.080	92.09
260MSW5PS5	0.2	106.57	0.992	E_α=120.70α+82.43	0.080	92.09
260MSW0PS1	0.1	96.95	0.987	E_α=102.39α+86.71	0.070	93.88
260MSW0PS1	0.2	107.19	0.959	E_α=102.39α+86.71	0.070	93.88

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