Higher heating value prediction of torrefaction char produced from non-woody biomass

doi:10.1007/s11708-015-0377-3

Frontiers in Energy

2015, Vol. 9

Issue (4): 461-471 https://doi.org/10.1007/s11708-015-0377-3

本期目录

Higher heating value prediction of torrefaction char produced from non-woody biomass

Nitipong SOPONPONGPIPAT(

),Dussadeeporn SITTIKUL,Unchana SAE-UENG

Department of Mechanical Engineering, Faculty of Engineering and Industrial Technology, Silpakorn University, Nakhon Pathom 73000, Thailand

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Abstract：

The higher heating value of five types of non-woody biomass and their torrefaction char was predicted and compared with the experimental data obtained in this paper. The correlation proposed in this paper and the ones suggested by previous researches were used for prediction. For prediction using proximate analysis data, the mass fraction of fixed carbon and volatile matter had a strong effect on the higher heating value prediction of torrefaction char of non-woody biomass. The high ash fraction found in torrefied char resulted in a decrease in prediction accuracy. However, the prediction could be improved by taking into account the effect of ash fraction. The correlation developed in this paper gave a better prediction than the ones suggested by previous researches, and had an absolute average error (AAE) of 2.74% and an absolute bias error (ABE) of 0.52%. For prediction using elemental analysis data, the mass fraction of carbon, hydrogen, and oxygen had a strong effect on the higher heating value, while no relationship between the higher heating value and mass fractions of nitrogen and sulfur was discovered. The best correlation gave an AAE of 2.28% and an ABE of 1.36%.

Key words： higher heating value correlation biomass proximate analysis ultimate analysis

收稿日期: 2014-12-27 出版日期: 2015-11-04

Corresponding Author(s): Nitipong SOPONPONGPIPAT

引用本文:

. [J]. Frontiers in Energy, 2015, 9(4): 461-471.
Nitipong SOPONPONGPIPAT,Dussadeeporn SITTIKUL,Unchana SAE-UENG. Higher heating value prediction of torrefaction char produced from non-woody biomass. Front. Energy, 2015, 9(4): 461-471.

链接本文:

https://academic.hep.com.cn/fie/CN/10.1007/s11708-015-0377-3
https://academic.hep.com.cn/fie/CN/Y2015/V9/I4/461

Tab.1

Biomass	Temperature /°C	Torrefaction time/min	Weight percentages (dry basis)								HHV_exp/(MJ·kg⁻¹)
Ash	VM	FC	C	H	N	S	O
Sugarcane leaves	Raw	—	8.3±0.3	73.8±1.0	17.9±1.2	47.4	5.9	0.55	0.15	37.7	17.94±0.60
	220	15	7.6±0.3	73.8±1.2	18.6±1.3	47.9	5.6	0.49	0.18	38.2	18.76±0.82
	260	15	9.5±0.3	66.7±1.3	23.8±1.2	50.9	5.4	0.30	0.17	33.7	20.01±0.36
	260	60	9.6±0.2	67.4±1.3	23.0±1.5	51.7	5.2	0.34	0.21	33	20.01±0.73
	280	60	9.9±0.1	58.4±1.0	31.7±1.3	56.5	5.1	0.46	0.23	27.8	21.65±0.43
Oil palm frond	Raw	—	4.0±0.2	79.1±1.5	16.9±1.4	44.8	5.5	0.31	0.12	45.3	18.21±0.79
	220	60	4.5±0.3	70.8±1.1	24.7±1.5	52.7	5.6	0.26	0.07	36.9	20.20±0.29
	260	15	5.0±0.4	66.4±1.4	28.6±1.3	55.2	5.2	0.27	0.08	34.2	21.21±0.47
	260	35	5.4±0.1	63.5±1.3	31.1±1.5	56.4	4.9	0.32	0.07	32.9	21.95±0.32
	260	60	5.6±0.3	61.0±1.1	33.4±1.4	58.4	5	0.36	0.07	30.6	22.48±0.45
	280	60	6.4±0.1	53.0±1.4	40.6±1.6	63.2	4.7	0.35	0.08	25.3	24.41±0.50
Rice straw	Raw	—	11.2±0.7	71.8±0.9	17.0±1.8	45.3	5.9	0.88	0.15	36.6	17.20±0.28
	220	60	14.9±0.8	68.9±1.2	16.2±1.0	45.8	5.5	0.9	0.09	32.8	17.38±0.60
	260	20	17.9±0.5	62.5±1.0	19.6±1.7	47.4	4.9	0.97	0.08	28.8	18.45±0.41
	260	40	18.5±0.5	59.8±1.2	21.7±1.3	49.1	5.1	0.98	0.07	26.2	18.78±0.57
	260	60	18.9±0.7	58.9±2.2	22.2±2.1	46.9	5	1.0	0.07	28.1	18.89±0.39
	280	60	24.0±0.5	46.0±2.0	30.0±0.9	51.4	4.4	1.2	0.07	18.9	20.73±0.66
Cassava rhizome	Raw	—	5.0±0.4	76.0±0.9	19.0±2.4	49.2	6.7	1.0	0.11	38.0	17.22±0.81
	220	60	10.7±0.5	70.4±1.8	18.9±1.7	46.3	5.6	0.88	0.09	36.4	18.50±0.59
	260	20	10.5±0.4	68.7±1.4	20.8±1.0	49.3	5.1	0.96	0.09	34.0	19.18±0.61
	260	40	12.2±0.5	64.7±1.2	23.1±1.4	49.1	5.1	0.94	0.09	32.6	19.65±0.73
	260	60	11.6±0.6	65.8±1.4	22.6±1.4	50.6	5.2	0.97	0.09	31.5	19.79±0.76
	280	60	11.8±0.4	58.7±1.9	29.5±1.0	52.5	4.5	1.1	0.09	30.0	21.12±0.34
Corncob	Raw	—	2.0±0.5	80.5±2.9	17.5±1.4	49.7	5.9	0.38	0.03	42.0	19.06±0.24
	220	60	6.0±0.3	74.7±2.2	19.3±1.9	48.2	5.4	0.94	0.08	39.4	19.01±0.65
	260	10	7.5±0.3	64.2±1.2	28.3±2.1	54.5	5.5	1.2	0.1	31.2	21.28±0.84
	260	60	8.2±0.4	61.9±1.0	29.9±1.7	53.4	4.9	1.2	0.11	32.2	21.45±0.89
	280	60	10.6±0.5	49.4±1.5	40.0±1.2	62.3	4.6	1.5	0.1	20.9	23.83±0.47

Tab.2

Correlation	No.	Equation	Researchers	R²reported	HHV unit	Types of material
Correlations based on proximate analysis	Eq. (1)	HHV=354.3FC+170.08VM	Cordero et al., 2001 [6]	0.999	kJ/kg	Forest/agricultural wastes /char
	Eq. (2)	HHV=0.196FC+14.119	Demirbaş, 1997 [15]	−0.647	MJ/kg	Biomass
	Eq. (3)	HHV=0.3536FC+0.1559VM−0.0078Ash	Parikh et al., 2007 [14]	0.942	MJ/kg	Solid carbonaceous materials (Coals,lignite,manufactured fuel, biomass,MSW, biomass char)
	Eq. (4)	HHV=0.1905VM+0.2521FC	Yin, 2011 [17]	0.995	MJ/kg	Biomass
	Eq. (5)	HHV=19.288−0.2135VM/FC−1.9584Ash+0.0234FC/Ash	Nhuchhen and Abdul Salam, 2012 [4]	–	MJ/kg	Biomass (by products of fruits, Agri-wastes,wood, grasses,leaves, fibrous materials)
	Eq. (6)	HHV=20.7999−0.3214VM/FC+0.0051(VM/FC)²−11.2277Ash/VM+4.4953(Ash/VM)²−0.7223(Ash/VM)³+0.0383(Ash/VM)⁴+0.0076FC/Ash	Nhuchhen and Abdul Salam, 2012 [4]	–	MJ/kg
	Eq. (7)	HHV=259.3(VM+FC)−2454.76	Thipkhunthod et al., 2005 [12]	0.899	kJ/kg	Sewage sludge
	Eq. (8)	HHV=−3.0368+0.2218VM+0.2601FC	Sheng and Azevedo, 2005 [1]	0.617	MJ/kg	Biomass
	Eq. (9)	HHV=0.312FC+0.1534VM	Demirbaş, 1997 [15]	−0.306	MJ/kg	Biomass
	Eq. (10)	HHV=19.914−0.2324Ash	Sheng and Azevedo, 2005 [1]	0.625	MJ/kg	Biomass
	Eq. (11)	HHV=−10.8141+0.3133(VM+FC)	Jiménez and González, 1991 [13]	0.533	MJ/kg	Lignocellulosic residues
Correlations based on ultimate analysis	Eq. (12)	HHV=0.3259C+3.4597	Sheng and Azevedo, 2005 [1]	0.758	MJ/kg	Biomass
	Eq. (13)	HHV=3.55C²−232C−2230H+51.2C×H+131N+20600	Friedl et al., 2005 [2]	0.943	kJ/kg	Biomass
	Eq. (14)	HHV=0.3491C+1.178H+0.1005S−0.1034O−0.015N−0.0211Ash	Channiwala and Parikh, 2002 [18]	0.733	MJ/kg	Gaseous and liquid fuels/coal/coke/biomass/refuse,MSW/animal waste
	Eq. (15)	HHV=0.4373C−1.6707	Tillman, 1978 [19]	0.666	MJ/kg	Biomass/refuse
	Eq. (16)	HHV=0.2949C+0.825H	Yin, 2011 [17]	0.997	MJ/kg	Biomass
	Eq. (17)	HHV=−1.3675+0.3137C+0.7009H+0.0318O	Sheng and Azevedo, 2005 [1]	0.834	MJ/kg	Biomass
	Eq. (18)	HHV=−0.763+0.301C+0.525H+0.064O	Jenkins and Ebeling, 1985 [8]	0.792	MJ/kg	Biomass
	Eq. (19)	HHV=430.2C−186.7H−127.4N+178.6S+184.2O−2379.9	Thipkhunthod et al., 2005 [12]	0.905	kJ/kg	Biomass

Tab.3

Fig.1

Fig.2

Tab.4

Fig.3

Fig.4

Tab.5

Fig.5

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