Experimental Study on the Air Gasification Characteristics of Agricultural and Forestry Waste in a Circulating Fluidized Bed

doi:10.12096/j.2096-4528.pgt.23031

Abstract

Abstract:

Objectives The effects of biomass types on the air gasification characteristics of circulating fluidized bed under different parameters were investigated, so as to provide relevant data reference for biomass circulating fluidized bed gasification technology with wide fuel adaptability and biomass gasification coupled coal-fired power generation technology. Methods An experimental study of air gasification with air equivalent ratio (ER) and gasification temperature as parameters and agricultural and forestry waste (rice husk, sawdust, corn stalk and rice straw) as feedstock, was carried out on a small atmospheric circulating fluidized bed. Results The change patterns of syngas components for rice husk, sawdust, corn stalk and rice straw at different air equivalent ratios are basically the same. When the air equivalent ratio increases, both the low calorific value and cold gas efficiency of syngas for rice husk, sawdust, corn stalk and rice straw have an increasing-decreasing trend. For the rice husk, sawdust and corn stalk, ER=0.20 is the optimum operating condition, and the highest cold gas efficiency is respectively 46.19%, 38.07%, and 38.07%. However, for rice straw, ER=0.25 is the optimum operating condition, and the maximum cold gas efficiency can reach 39.55 %. The change patterns of the three combustible gases (CH₄, CO, H₂) in the syngas components for rice husk, sawdust, corn stalk and rice straw is also consistent at different gasification temperatures. When the gasification temperature increases, the low calorific value and cold gas efficiency of syngas for rice husk, sawdust, corn stalk and rice straw also show an increasing-decreasing trend. For rice husk and corn stalk, T=750 ℃ is the optimum operating condition, and the highest cold gas efficiency is respectively 46.19% and 37.71%. However, for sawdust and rice straw, T=760 ℃ is the optimum operating condition, and the maximum cold gas efficiency can reach respectively 38.07% and 37.56%. Conclusions It can provide relevant data reference for biomass circulating fluidized bed gasification technology with wide fuel adaptability and biomass gasification coupled coal-fired power generation technology.

Key words: agricultural and forestry waste, biomass, circulating fluidized bed, air gasification, air equivalent ratio

CLC Number:

TK 6

Zhongming GAO, Deao ZHU, Yujia CHEN, Sanju LIU, Qinhui WANG. Experimental Study on the Air Gasification Characteristics of Agricultural and Forestry Waste in a Circulating Fluidized Bed[J]. Power Generation Technology, 2024, 45(3): 535-544.

Figures/Tables 14

Fig. 1 Schematic diagram of small atmospheric circulating fluidized bed gasification system

Tab. 1 Component analysis of agricultural and forestry waste

项目		稻壳	木屑	玉米秸秆	稻草
工业分析	w_ad(M)/%	5.85	11.66	10.30	2.24
	w_ad(A)/%	11.79	0.82	8.39	18.84
	w_ad(V)/%	65.13	72.01	64.02	62.40
	w_ad(FC)/%	17.23	15.51	17.29	16.52
热值	Q_net，ad/(J·g^-1)	15 158	16 472	14 350	14 133
元素分析	w_ad(C)/%	41.71	45.13	40.62	38.05
	w_ad(H)/%	4.76	4.54	4.22	4.64
	w_ad(N)/%	0.47	0.08	0.95	1.01
	w_ad(S)/%	0.16	0.18	0.30	0.24
	w_ad(O)/%	35.26	37.59	35.22	34.98
	w_ad(K)/%	0.767	0.068	2.731	2.336
	w_ad(Na)/%	0.006	0.007	0.083	0.104

Tab. 2 Experimental working condition parameter setting at 750 ℃

参数	稻壳	木屑	玉米秸秆	稻草
E_R	0.15	0.16	0.15	0.18
	0.20	0.20	0.20	0.20
	0.25	0.25	0.25	0.25
	0.30	0.30	0.30	0.30

Tab. 2 Experimental working condition parameter setting under ER=0.2 condition

参数	稻壳	木屑	玉米秸秆	稻草
T/℃	720	720	690	690
	750	760	720	720
	780	800	750	750
	810	—	780	780

Fig. 2 Effect of air equivalent ratio on gas components

Fig. 3 Effect of air equivalent ratio on low calorific value of gas

Fig. 4 Effect of air equivalent ratio on gas yield rate of gas

Fig. 5 Effect of air equivalent ratio on carbon conversion rate

Fig. 6 Effect of air equivalent ratio on cold gas efficiency

Fig. 7 Effect of gasification temperature on gas components

Fig. 8 Effect of temperature on low calorific value

Fig. 9 Effect of temperature on gas yield rate of gas

Fig. 10 Effect of temperature on carbon conversion rate

Fig. 11 Effect of temperature on cold gas efficiency

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