Research on Modeling and Variable Operating Condition Characteristics of Entrained Flow Coal Gasifier Based on Aspen Plus

doi:10.12096/j.2096-4528.pgt.22149

Abstract

Abstract:

Objectives This research aims to investigate the operational mechanism of a coal gasifier within an integrated gasification combined cycle (IGCC) power plant, with a focus on analyzing and optimizing key operational parameters. Methods A steady-state thermodynamic model of the gasifier was developed using Aspen Plus. The model’s accuracy was validated by comparing its simulation results with published data. A sensitivity analysis was then conducted to assess the impact of key gasifier parameters. Results The thermodynamic model demonstrates the suitability for simulating steady-state coal gasification processes. The model exhibits high accuracy, simplified structure, and efficient computational performance. Conclusions The sensitivity analysis reveals that the oxygen-to-coal ratio holds the most significant influence on the coal gasification process. Both insufficient and excessive oxygen levels result in a reduction of syngas active ingredient production. The optimal oxygen-to-coal ratio for the Shell gasifier model is determined to be approximately 0.85. Water-to-coal ratio also plays a critical role in the gasification process. When sufficient energy is present within the gasifier, increasing the water input leads to higher water content in the syngas, potentially increasing hydrogen concentration. However, excessive water input under energy-constrained conditions can decrease the effective composition of the syngas.

Key words: coal-fired power generation, integrated gasification combined cycle (IGCC), coal gasification, Aspen Plus, thermodynamic model, entrained flow coal gasifier

CLC Number:

TK 01

Yinan WANG, Jiayang LÜ, Heng CHEN, Guoqiang ZHANG, Gang XU, Rongrong ZHAI. Research on Modeling and Variable Operating Condition Characteristics of Entrained Flow Coal Gasifier Based on Aspen Plus[J]. Power Generation Technology, 2024, 45(5): 951-958.

Figures/Tables 8

References 23

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参数	入炉煤		氧化剂(氧气)		水煤浆		气化条件				熔渣
参数	煤种	流量/(t/h)	压力/MPa	流量/(t/h)	耗水量/(t/h)	质量分数/%	气化温度/℃	气化压力/MPa	氧煤比	水煤比	w(碳)/%	w(灰)/%	流量/(t/h)
数值	Illinois#6	572.9	4.14	444.07	184.61	66.5	1 315.6	4.0	0.96	0	0	100	50.35

参数	入炉煤		氧化剂(氧气)		水煤浆		气化条件				熔渣
参数	煤种	流量/(t/h)	压力/MPa	流量/(t/h)	耗水量/(t/h)	质量分数/%	气化温度/℃	气化压力/MPa	氧煤比	水煤比	w(碳)/%	w(灰)/%	流量/(t/h)
数值	Illinois#6	572.9	4.14	444.07	184.61	66.5	1 315.6	4.0	0.96	0	0	100	50.35

组分	体积分数/%		质量流量/(t/h)
组分	设计数据	模拟数据	设计数据	模拟数据
合计	100	100	958.9	958.83
CO	60.3	60.62	788.81	792.9
H₂	30.0	29.69	28.12	27.94
N₂	3.6	3.68	46.72	48.12
H₂O	2.0	2.13	16.78	17.89
CO₂	1.6	1.38	33.11	28.38
H₂S	1.2	1.21	18.6	19.28
AR	1.1	1.14	21.32	21.2
COS	0.1	0.10	3.63	2.76
CH₄	—	0.04	0.45	0.28
NH₃+HCN	0.1	0.01	1.36	0.08

组分	体积分数/%		质量流量/(t/h)
组分	设计数据	模拟数据	设计数据	模拟数据
合计	100	100	958.9	958.83
CO	60.3	60.62	788.81	792.9
H₂	30.0	29.69	28.12	27.94
N₂	3.6	3.68	46.72	48.12
H₂O	2.0	2.13	16.78	17.89
CO₂	1.6	1.38	33.11	28.38
H₂S	1.2	1.21	18.6	19.28
AR	1.1	1.14	21.32	21.2
COS	0.1	0.10	3.63	2.76
CH₄	—	0.04	0.45	0.28
NH₃+HCN	0.1	0.01	1.36	0.08

组分	体积分数/%		质量流量/(t/h)
组分	设计数据	模拟数据	设计数据	模拟数据
合计	100	100	1 151.24	1 151.17
CO	40.8	42.30	649.1	674.57
H₂	29.6	28.97	33.57	33.25
H₂O	17.0	17.83	174.64	182.92
CO₂	10.2	8.92	254.01	223.61
H₂S	1.0	1.02	19.5	19.70
N₂	0.7	0.76	10.89	12.17
CH₄	0.3	0.01	2.72	0.13
NH₃	0.2	0.01	1.81	0.03
AR	0.1	0.12	2.72	2.77
COS	0.1	0.06	2.27	2.02