煤制甲醇与绿氢高效耦合新工艺模拟及技术经济分析

In response to the high carbon emissions, high energy consumption, and low utilization efficiency of coal resources in traditional coal to methanol processes, two new green hydrogen efficient coupling processes (process I and II) were proposed, which introduced carbon dioxide hydrogenation technology and dry reforming of methane technology, respectively. Taking the traditional coal to methanol route with an annual production capacity of 3×10⁵t as a case study, the material changes and energy consumption of the green hydrogen coupling processes were systematically analyzed through theoretical analysis and Aspen simulation. A comprehensive techno-economic analysis was conducted, comparing the new processes with the traditional coal to methanol process from multiple dimensions, including energy consumption, carbon emission intensity, carbon utilization efficiency, investment costs, and production costs. The results showed that compared with the traditional coal to methanol process, the carbon element utilization rate of the new process I and new process II had increased from 38.74% to 84.56% and 67.60%, the coal consumption per ton of methanol had decreased from 1.42t to 0.65t, and the carbon emission intensity per unit of methanol had decreased by 62.84% and 56.42%, respectively. Through the analysis of investment and production costs, it was found that due to the influence of hydrogen production scale, the investment of new process I was relatively high, while the total investment of new process II was comparable to that of the traditional process. Presently, owing to the high cost of hydrogen, the unit production costs of methanol for the two new processes were 1.84 times and 1.51 times of the traditional process, respectively. However, with the implementation of increasing carbon taxes and decreasing hydrogen production costs, the economic advantages of the new processes would become increasingly apparent. Both processes significantly reduced carbon emissions while increasing methanol production capacity, offering advantages in terms of energy efficiency and economic performance, and demonstrating promising application prospects.