Schneider QUANTUM PLC application in steelmaking converter production

Pick to: this article in a 150 t converter as an example, from the control process, system composition, solution, the economic benefit of Quantum PLC controller was introduced in detail from the aspects such as the application practice. Key words: Quantum PLC, converter, automation control an overview, based on 150 t converter for a certain steel works as the background, the automation system configuration USES the Schneider automation Quantum PLC. Project consists of three parts: the ontology of converter, oxygen lance and raw material, corresponding to three sets of PLC control system. System simulation quantity about 2000 points, the digital quantity about 3000 points, 18 adjusting circuit. Second, the main process in figure 3, system control content and function requirements 1, oxygen gun parts ( 1) Oxygen lance control: drop the gun test conditions, the control in the process of converting a series of chain. （ 2) Oxygen lance positioning control: the incremental encoder, judge the converting position automatically. （ 3) Inverter control: oxygen lance feed water pump, water pump, steam drum equipment all pumps and other important equipment is controlled by frequency converter. （ 4) : the slag splashing in converter or complex automatic control. Using basic medium-pressure nitrogen blowing furnace residue remaining to converter furnace wall. （ 5) For converter tilting control: forward, backward operation, the protection of oxygen lance. Part 2, raw material control of steelmaking in bulk materials and alloy materials for preparation and blanking. Bulk materials and alloy materials through the bin and feeder, weighing hopper, chute, belt conveyor and discharge chute to control and interlock, quantitative of bulk materials and alloy materials added to work. 3, instrument control part mainly includes the drum level and regulating, deaerator water level and adjustment, top blowing oxygen flow rate adjustment, bottom blowing model and flow control, the hydraulic control and fundamental data such as temperature, pressure, flow rate of the collection and processing. 4, a dedusting fan of converter mainly complete the fan speed control, gas recovery valve control, instrument parameters of collection and processing. Four, key and difficult ( 1) Oxygen lance position incremental encoder, through 1756 - HSC high-speed counter template acquisition encoder pulse signal, the CPU processing into displacement signal of quantities. （ 2) Calls the parameter files are used to achieve the same screen, control the function of different bin. （ 3) In blowing period and the converting period, fan is controlled by high speed, using two kinds of speed change step by step. （ 4) At the same time of steel or slag can be manual lifting oxygen gun, start the slag scraper, scraping the slag. （ 5) Data communications between each system USES annular fast Ethernet, the network media is damaged, can guarantee the stability of network continue to run, at the same time generate alarm, notify the maintenance personnel for processing. Five six, system composition, the solution is oxygen gun under the PLC hardware configuration, the main operating station 1, seven large amount of data high speed data processing. About 2000 points, analog switch quantity about 3000 points. 2, long-term historical trend query function. A month can save hundreds of points of historical trend. 3, adjust the control functions. Control circuit of 18. 4, showing in the production process. Process pictures are more than 120 picture. 5, event alarm processing. Recording time for a month, alarm 600 entries. 6, fast and good dynamic response ability. Fast production equipment control was achieved by human-computer interaction. Economic benefit calculation of the eight, mainly reflected in: the control system and stable operation in steel production proportion of comprehensive benefit. To normal production of year 330 days, according to the converter steelmaking 150 tons per hour, the benefits of per ton steel 80 yuan, the control system of comprehensive benefits than 10% computation, the economic benefits = 330 x24x150x80x10 % = 950. 4 ( Ten thousand yuan) 。 Nine, system evaluation of 1, high reliability: Schneider PLC provides a more reliable platform. 2, strong openness: standard industrial Ethernet architecture for the system has provided a broad space. 3, low failure rate, strong ability of electromagnetic radiation and interference resistance and industrial design makes the PLC failure rate 1 time/year or less. 4, strong adaptability, can work in bad metallurgical enterprise environment. 5, performance, and major operating systems, industrial control software, user application compatible with good performance, good performance of real-time control.
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