Design And Implementation Of Process Control System In Scrap Copper Smelting

Copper is raw material of great strategic significance in the national economic development and security. Because of the shortage of copper resources in our country, regeneration of scrap copper in an efficient, clean, energy saving way is the only outlet. However, the existing scrap smelting process is of high energy consumption, labor-intensive, serious environmental pollution, and low content of scrap copper resources can not be fully utilized, particularly urgent existing regeneration of the scrap smelting equipment (reverberatory furnace) is included in the out directory by the National Development and Reform Commission. To carry out new research process of continuous smelting of scrap copper and its control system, the format renewable resources and energy saving technology system, and to establish the recycling economy development model of non-ferrous metals industry, is the primary problem needed to solve to build a resource-saving and environment-friendly society. Therefore, this thesis designs smelting process computer control system, and studies the optimal control strategy object to the continuous scrap smelting process based on the vertical-reverberatory furnace for the energy conservation and emission reduction objectives.The main content of this thesis:1. Introduced the continuous process of scrap copper based on the vertical-reverberatory furnace. The process shortened the refining time, using efficient methods of energy for raw materials in the shaft furnace heating and the high-temperature flue gas preheating of raw materials, which are greatly improved energy efficiency. In addition, the scrap copper material is melted in the suspended state in the vertical furnace; the droplets can be oxidized easily because of the enlarged contacting area with the furnace gas, so that oxidation of the impurities can be removed very well in the vertical furnace, which make it possible to smelt scrap copper using raw materials of low-grade.2. Design the computer control system with the continuous smelting process as the object. Divided the entire process into four subsystems, research the control features of each subsystem, the main control parameters and process control requirements, the main variables'underlying control charts and optimal control schemes. Research software and hardware equipment of the DCS system for the continuous scrap smelting process, including sensors, actuators and controller design and selection, private and non-standard device interface circuit design, on-site controller software design and programming, system monitoring software design and programming and so on. Finally, this thesis analyzes the situation and problems of the process with the actual operation of the binding process and DCS.3. Proposed data-driven optimal control strategy for the less of detection variables and difficulties mechanism process modeling, and simulate with the actual operating data. Combined with the continuous smelting process, designed the subspace predictive controller for the uncertain processes, combustion, oxidation and reduction in the case of direct use of input-output data based on the combined qualitative mechanism and data-driven.