Optimization analysis of a cogeneration system based on methanol synthesis and gas turbine combined cycle

doi:10.3969/j.issn.2097-0706.2025.10.007

Abstract

Abstract:

A new system was proposed to achieve comprehensive optimization of the traditional methanol synthesis system. In this system， the purge gas from methanol synthesis system served as the feed gas for the Gas Turbine Combined Cycle （GTCC）. Additionally， GTCC effectively recovered the heat generated by the methanol synthesis tower， improving overall energy efficiency and power generation capacity. A model of the new system was developed using Aspen Plus software， and its performance was compared with that of the traditional synthesis system. Thermodynamic and sensitivity analyses were conducted for both systems. Thermodynamic analysis results revealed that， compared to the conventional system， the GTCC-integrated methanol synthesis system achieved a 3.53% enhancement in energy efficiency and a 3.66% improvement in exergy efficiency. Sensitivity analysis indicated that under operating conditions with pressures ranging from 3 to 8 MPa， synthesis temperatures between 200 and 300 ℃， split ratio from 0.95 to 0.99， and an H₂/CO₂ molar ratio between 2.5 to 3.5， increasing pressure， adopting a higher split ratio， setting the synthesis temperature at 250 ℃， and maintaining an H₂/CO₂ molar ratio of 3 contributed positively to methanol production.

Key words: green hydrogen-based methanol production, purge gas optimization, energy analysis, exergy analysis, sensitivity analysis

CLC Number:

TK01：TM471

HUANG Ziqi, WU Zhicong, XU Gang, GE Shiyu, CHEN Heng. Optimization analysis of a cogeneration system based on methanol synthesis and gas turbine combined cycle[J]. Integrated Intelligent Energy, 2025, 47(10): 60-68.

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项目	摩尔分数/%	能量占比^①/%
H₂	32.91	1.16
CO	1.21	0.05
CO₂	30.56
CH₃OH	34.10	3.16
H₂O	1.22

项目	原料气		循环气
项目	H₂	CO₂	循环气
H₂摩尔分数	1.000	0	0.757
CO₂摩尔分数	0	1.000	0.208
CO摩尔分数	0	0	0.027
H₂O摩尔分数	0	0	0.001
CH₃OH摩尔分数	0	0	0.006
温度/℃	50.000	14.000	44.455
压力/MPa	3.0	5.0	4.5
摩尔流量/(kmol·h^-1)	10 380.00	3 460.00	51 718.78

项目	数值
温度/℃	49.46
压力/MPa	0.1
CH₂OH摩尔流量/(kmol·h^-1)	124.31
H₂摩尔流量/(kmol·h^-1)	119.97
CO摩尔流量/(kmol·h^-1)	111.39
CO₂摩尔流量/(kmol·h^-1)	4.40
H₂O摩尔流量/(kmol·h^-1)	4.46
低热值/(MJ·kg^-1)	19.95

项目	数值
环境温度/℃	25
压力/MPa	0.1
空气压缩机压比	25.8
压气机多变效率/%	88
燃烧室燃气出口温度/℃	1 515
燃气轮机排气温度/℃	654
燃气轮机等熵效率/%	92
汽轮机高压缸等熵效率/%	85
汽轮机中压缸等熵效率/%	85
汽轮机低压缸等熵效率/%	85
汽轮机高压缸进汽温度/℃	615
再热温度/℃	92.2
发电效率/%	57.28

项目	文献数据^[17,26]	本文数据	相对误差/%
甲醇产量/(t·h^-1)	104.38	104.44	0.06
甲醇纯度/%	99.92	99.94	0.02
GTCC系统发电净输出功率/MW	526.14	525.07	0.20
GTCC系统发电效率/%	57.62	57.28	0.59