Hydrogen Network Optimization Using CO2 Management

Hydrogen is one of the most important sources of renewable energy, but in most refineries, along with the production of hydrogen by fossil fuels, a significant amount of CO2 is also produced. This paper presents a mathematical model for CO2 emission from each unit in the hydrogen network as well as multi-objective optimization. This model includes linear mathematical programming (LP), which illustrates the relationship between CO2 emissions and feed input to the fuel system and the output product of the hydrogen generating unit. The model constant parameters are obtained from the experimental data from the hydrogen network of Bandar Abbas Oil refinery. The objective function is based on the multi-objective function, which simultaneously reducing CO2 emissions and also reducing total annual cost of hydrogen network. The results of optimized network indicated that total annual cost and CO2 emissions have been decreased by 29.1% and 22.4%, respectively. Furthermore, hydrogen within the fuel system was recovered to use in hydrogen network by purifications units. The amount of hydrogen recovery from fuel gas, which has been sent to purification units, is 16200 m3/h.