Modeling and Dynamic Characteristic Analysis of Combustion Process of Biomass Vibrating Grate Furnace

doi:10.12096/j.2096-4528.pgt.23137

Abstract

Abstract:

In order to explore the combustion characteristics of the biomass vibrating grate furnace and realize the control and optimization of the unit combustion process, the mechanism model of the grate combustion process was established through the analysis of the biomass fuel characteristics and combustion mechanism. Moreover, the dynamic change of the grate fuel amount was studied, and the key parameters such as furnace temperature and flue gas oxygen content were predicted. The influence of periodic vibration of grate on combustion state in furnace was discussed. The results show that the amount of fuel in the grate is related to the current feed rate and fuel burning rate. The fuel has a large storage capacity on the grate, which leads to a large delay between the fuel burning and the current feeding. The predicted values of furnace temperature and flue gas oxygen content can follow the measured values well, and their changes are in accord with the combustion characteristics. The periodic vibration of the grate will cause the periodic change of the combustion state in the furnace. When the grate vibrates, the fuel combustion speed, furnace temperature, furnace pressure will increase, and the oxygen content of the flue gas will be reduced. As the vibration of the grate stops, these parameters return to the steady state level.

Key words: thermal power, biomass direct combustion power generation, grate furnace, combustion characteristics, dynamic characteristics

CLC Number:

TK 22

Haiwei JIANG, Mingming GAO, Jie LI, Haoyang YU, Guangxi YUE, Zhong HUANG. Modeling and Dynamic Characteristic Analysis of Combustion Process of Biomass Vibrating Grate Furnace[J]. Power Generation Technology, 2024, 45(2): 250-259.

Figures/Tables 11

Fig. 1 Biomass fuel combustion process

Fig. 2 Biomass vibrating grate furnace structure

Tab. 1 Elemental analysis and industrial analysis of fuel in furnace

元素分析					工业分析
C_ar	H_ar	O_ar	N_ar	S_ar	F_Car	V_ar	M_ar	A_ar
41.52	4.12	24.60	1.70	0.13	2.75	69.32	14.20	13.73

Fig. 3 Comparison of feed speed and combustion speed

Fig. 4 Grate fuel quantity and its influencing factors

Fig. 5 Comparison of predicted and measured values of furnace temperature

Fig. 6 Comparison of predicted and measured values of oxygen content in flue gas

Fig. 7 Influence of grate vibration on combustion rate

Fig. 8 Influence of grate vibration on furnace temperature

Fig. 9 Influence of grate vibration on furnace pressure

Fig. 10 Influence of grate vibration on oxygen content in flue gas

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