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Taking advantage of coalbed methane as a substitute for coal fuel can facilitate CO2 reduction in addition to CO2 sequestration. Here, the CO2 reduction potential and economic impact of CO2 recovery of methane from a coalbed were evaluated at a CTO plant in the Inner Mongolia Autonomous Region of China. Emission reductions and capital, annual, and methane costs were analyzed basing on engineering data, empirical formulas, and assumptions. Cost analysis included the influence of a potential carbon tax. In addition, a sensitivity analysis was conducted on the annual gross profit to parameters, including carbon tax, CO2 capture rate (CCR), pipeline distance, capital recovery factor, CO2 injection rate, operation and maintenance (O&M) percentage, coal depth, and methane price. Results showed that an optimal CO2 capture rate is about 80%, taking into consideration total capital, annual, and methane costs. At this optimum CCR, the methane price was calculated as $0.12 Nm−3 and a total capital cost of $323.14 M, which also results in a 58% reduction in CO2 emissions. Reductions from CO2 sequestration and fuel substitution respectively account for 66% and 34% of the total emissions reductions. The carbon tax impact analysis suggests a carbon tax greater than $20 per tCO2 will maintain a profitable system with a range in CCR of 70–80%. The sensitivity analysis demonstrates that carbon tax, CCR, and pipeline distance have the greatest effects on annual gross profit.

The economic and CO2 reduction benefits of a coal-to-olefins plant using a CO2-ECBM process and fuel substitution

The economic and CO₂ reduction benefits of a coal-to-olefins plant using a CO₂-ECBM process and fuel substitution