A mathematical model was proposed to optimize byproduct gas system and reduce the total cost.The scope and boundaries of the system were also discussed at the same time.Boilers and gasholders were buffer users to solve the fluctuation of byproduct gases.The priority of gasholders should be ranked the last.The allocation of surplus gases among gasholders and boilers was also discussed to make full use of gases and realize zero emission targets.Case study shows that the proposed model made good use of byproduct gases and at least 7.8% operation cost was reduced,compared with real data in iron and steel industry.
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