Balance Of The Oxygen Pipe-network And Scheduling In Iron And Steel Enterprises

Iron and steel industries are energy-intensive industries, and the oxygen system is an indispensable important component of iron and steel production. Almost all of the domestic large-scale iron and steel enterprises are equipped with oxygen production system to meet the supply of oxygen in the steel production process, air separation plant production of oxygen, nitrogen and argon are the most important part of the gas products. Its Energy consumption accounts for a large proportion of the energy consumption of iron and steel enterprises.In the oxygen supply and demand system, the imbalance of oxygen supply and consumption leads to the oxygen diffuse or alarm, which gives rise to a waste of energy resources or affect the iron and steel enterprises to normal production. China’s iron and steel enterprises oxygen emission rate is generally higher, and in some developed countries of oxygen in the iron and steel enterprises emission rate is lower, such as oxygen in the gas pipe network in North America almost no relief. Thus by optimizing the scheduling and control method to balance the supply and demand changes of oxygen pipe network, then reducing the emission of oxygen, reducing energy costs, improving energy efficiency, is of great significance.In this paper, we conducted an in-depth study on the issues of the oxygen diffuse in the oxygen pipe network system, pipe network pressure fluctuations. The main research work and contributions are as follows:1. For the process of oxygen network system in iron and steel enterprise, analysis of the three main components of the the oxygen pipe network system, namely, oxygen produce systems, oxygen use system and oxygen storage system. Focuses on the impact of main oxygen users in steel enterprises on the pressure of oxygen pipe network. Create the models of each sub-module in the oxygen pipe network system, and use the data collected in the field to verify the model, so the mathematical model match as possible to the model and actual production.2. Analyze the scheduling method used by the oxygen system of iron and steel enterprises and the reason of oxygen diffusing. For the oxygen pipe network system of iron and steel enterprises, we proposed the scheduling optimization constraints of the proposition. And with oxygen diffusion, low energy consumption, the economic goals, we established mixed integer nonlinear programming scheduling model. Simulation comparative analysis based on field data show that optimize the scheduling result is better than manual scheduling, to verify the effectiveness of the method.3. Proposes a two-tier structure of predictive control strategy to realize the real-time balance of oxygen pipe network. To solve the pipe network imbalance caused by the oxygen pipe network sudden changes of supply and demand and the deviation of scheduling model and the actual system, we take the predictive control method based on the pressure in the pipe. Partial load instruction given by scheduling optimization and the output load instruction from pipeline pressure prediction controller, they superimposed to issue to the predictive controller of air separation, thus ensuring the real-time balance of pipe network. In this paper, we identify the oxygen pipe network system, get the prediction model of pipe network pressure. Then using the predictive control algorithm for control purposes.