Scheduling Unit Determination For Blast Furnace Gas System Based On Statistical Classification

Blast furnace gas (BFG) viewed as a class of byproduct gas is a significant energy resource for the secondary fuel in steel industry. To reduce the production cost of a steel enterprise, the scheduling performance of the energy system in steel industry should be further improved; therefore, the situation excessively relying on the personal experience of scheduling workers has to be changed during the process of energy balance adjustment. In such a way, the scientific guidance for the workers when scheduling the byproduct gas might be provided, which aims to reach the minimum gas emission, increase the economic benefit and improve the level of energy-saving and cost-reducing.In this paper, a real-time method based on statistics classification is proposed to determine the adjustable units for the gas system balance, which combines the Gaussian Process (GP) classifier with the fuzzy rule. Firstly the Gaussian Process classifier is adopted to separate the adjustment points from the entire time series of gas consumption amount of the adjustment units, and then the fuzzy rule based on the samples of the corresponding users are constructed. Secondly, using the established adjustment samples library, a Fuzzy C-Mean is proposed to build up a complete fuzzy rule base. In application, when the system is monitored to be out of the balanced zone of the gas system, the Fuzzy C-Mean severs to convert the generation and consumption gas flow at that time into the rules. Finally, the adjustable units can be identified according to the membership.Combined with the specific requirement based on the background of a steel plant, the practical data of the BFG system is employed to verify the performance of the proposed method, which can also offer the subsequent adjustment quantity distribution in the system, and the results can satisfy the demand of real-time and stability on site and solve the problem of scheduling lag. As such, the proposed method can realize reasonable utilization and allocation for the BFG, and achieve the balance of the entire gas system.