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Coke Oven Gas Conversion Efficiency Improvement by System Upgrading to Combined Cycle Power Plant
Lingyan Deng, Thomas Adams II
October 25, 2018 (v4)
Keywords: Coke oven gas, combined cycle power plant, GAMS optimization, MDEA desulphurization
Coke oven gas (COG) is one of the main by-products generated from steel refineries. In most cases, COG is used only to generate low pressure steam for process heat needs or for small amounts of electricity production. Carbon emissions are inevitable in this COG utilization method. However, carbon emissions are no longer free: the federal government has proposed a minimum carbon tax scheme which incentivises the steel industry to upgrade their present system in order to maintain their profitability. Based on a local steel refinery case study, we propose retrofitting the plant with a combined cycle power plant (CCPP) using COG as fuel input in order to help reduce CO2 emissions and increase energy efficiency. However, COG contains a significant amount of sulphur compounds which have to be removed before it can be used as fuel input for CCPP. Therefore, a MDEA based desulphurization process is proposed to reduce the main sulphur content (H2S) in COG to less than 1 ppmv. ProMax is used to... [more]
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