Analysis of Syngas Components and Energy in Biomass Gasification Coupled Power Generation System

doi:10.12096/j.2096-4528.pgt.22164

Abstract

Abstract:

To achieve the carbon emission reduction target, the use of biomass to replace traditional energy is a key measure. The gasification process in the biomass gasification coupled power generation system was modeled and analyzed by Aspen Plus. The influence of equivalence ratio and ambient pressure on the composition of syngas gas was investigated, and the variation law of calorific value and energy of syngas was discussed based on the calculation results. The results show that the volume fraction of H₂ shows a monotonically decreasing trend with the increase of the equivalence ratio, from 19.47% to 5.19%. The CO volume fraction reaches a maximum value of about 22% near the equivalence ratio of 0.3. The volume fraction of CH₄ shows a monotonically decreasing state with the increase of equivalence ratio, from 1.3% to 0. Relying on the results of theoretical research, the gas calorific value curve shows the same change rule as CO and H₂, and reaches the highest value when the equivalence ratio is 0.3. In the range of 0.3-0.35, the overall change is not obvious and then declines. Considering the energy brought into the furnace and the sensible enthalpy of the gas, a synthesis gas energy evaluation method of calorific value + sensible enthalpy was proposed, which reaches the maximum value when the equivalence ratio is about 0.35.

Key words: coupled power generation, biomass gasification, equivalence ratio, calorific value, energy analysis

CLC Number:

TK 6

Yan ZHENG, Xuan YAO, Xunqiang CHEN. Analysis of Syngas Components and Energy in Biomass Gasification Coupled Power Generation System[J]. Power Generation Technology, 2023, 44(6): 859-864.

Figures/Tables 6

References 14

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检测项目		数值
全水分质量分数/%		7.90
工业分析	干燥基灰分质量分数/%	7.06
	干燥基挥发分质量分数/%	68.80
	干燥基固定碳质量分数/%	24.14
元素分析	干燥无灰基碳质量分数/%	54.72
	干燥无灰基氢质量分数/%	5.05
	干燥无灰基氧质量分数/%	32.95
	干燥无灰基氮质量分数/%	0.40
	干燥无灰基硫质量分数/%	0.25
发热量	收到基低位发热量/(MJ/kg)	14.02
灰成分分析	w(SiO₂)/%	57.50
	w(Al₂O₃)/%	0.67
	w(Fe₂O₃)/%	1.09
	w(CaO/%	10.61
	w(MgO)/%	4.17
	w(TiO₂)/%	0.13
	w(SO₃)/%	2.73
	w(P₂O₅)/%	ND
	w(K₂O)/%	16.53
	w(Na₂O)/%	2.49

检测项目		数值
全水分质量分数/%		7.90
工业分析	干燥基灰分质量分数/%	7.06
	干燥基挥发分质量分数/%	68.80
	干燥基固定碳质量分数/%	24.14
元素分析	干燥无灰基碳质量分数/%	54.72
	干燥无灰基氢质量分数/%	5.05
	干燥无灰基氧质量分数/%	32.95
	干燥无灰基氮质量分数/%	0.40
	干燥无灰基硫质量分数/%	0.25
发热量	收到基低位发热量/(MJ/kg)	14.02
灰成分分析	w(SiO₂)/%	57.50
	w(Al₂O₃)/%	0.67
	w(Fe₂O₃)/%	1.09
	w(CaO/%	10.61
	w(MgO)/%	4.17
	w(TiO₂)/%	0.13
	w(SO₃)/%	2.73
	w(P₂O₅)/%	ND
	w(K₂O)/%	16.53
	w(Na₂O)/%	2.49