The function of controlling the active level of the titanium plate casting process mainly includes the following aspects:
(1) Experimental analysis and data processing. The analysis results of various materials (alloys and other inputs) and the rapid analysis of the whole plant analysis computer or the fine furnace front or the titanium water content of the converter and electric furnace calculation machine are sent to the titanium plate casting process for control and calculation. Machine, the latter will check it reasonably, then save it in the material analysis value file and display it actively by CRT.
(2) Data collection. Most of them are collected by the base-level active level and uploaded to the process machine through the network, and some manual input data is also included. There are roughly four types of data:
1) The original data, such as the converter times of titanium plate casting, the temperature, component and composition of titanium water.
2) The data during and after the treatment, such as circulating argon gas, furnace gas composition, exhaust gas volume and temperature of titanium plate casting RH vacuum treatment equipment, titanium water temperature and composition after treatment, etc.
3) Mathematical model and data required for skill calculation, including manual input data.
4) Print the data required for the report.
There are two types of data collection and disposal: regular cycle and non-fixed cycle. Periodic data collection and disposal is based on a period of 1 min or less. After the data is collected, instantaneous value cumulative disposal is performed. Disposal of instantaneous value includes appearance condition monitoring, smoothing, thermocouple disconnection checking and input disposal, range unit data change and ultra-low detection, etc., and it is made into cumulative file, instantaneous value file, series of files per minute, etc. Non-periodic data collection and processing is initiated by the process stop signal or setting, and the processing is similar to the instantaneous value.
(3) Tracking. The content of the tracking includes the converter furnace times of titanium plate casting, the parameters of titanium water, the time of titanium release, and the demand for titanium plate casting.
(4) Acceptance and release of production instructions. The content includes the titanium water production plan scheduling information of the production management level (L3) or the converter computer related management system, the release time, policy components, essential methods and other instructions, the preparation and correction of short-term plans, the LF furnace heating instructions, Power setting, tap determination of the transformer, titanium water disposal control (alloying, deoxidation, desulfurization), etc.
(5) Handling of production operations. The content includes the handling of each silo’s material level and inventory, alloy weighing and participation handling, and disposal time handling.
(6) Model calculation, optimization and use of work intelligence. This is the most important part of the process control, and it is also the most economical link. The casting of different titanium plates is different, and the different ilmenite enterprises are different, but from RH-OB, CAS-0B, VOD, AOD In view of several typical titanium plate castings, the model calculation and optimization mainly include the following contents:
1) In order to make the titanium water composition reach the guideline value, calculate the alloy material participation amount, fine-tune the composition and make the alloy cost the lowest, most of them are linear programming with the best cost as the guideline function.
2) According to the change of titanium water temperature, precise control of titanium water temperature is within the guidelines. When using electric arc heating, the electric power and heating time required for heating should be determined and the settings should be optimized to minimize the electric energy and shorten the exercise time. When the temperature is increased by chemical methods, the amount of oxygen blown and the amount of aluminum added should be calculated.
3) According to the different needs of titanium, choose the best argon blowing or electromagnetic search and mixing form.
4) According to the requirements of desulfurization and dephosphorization, calculate the amount of slag or blowing agent.
5) About RH and other vacuum degassing equipment, the degassing time and the amount of decarburization need to be accounted for. Some of them also have a dynamic model, that is, the kinetic balance method and metallurgical model are used to calculate the decarburization and temperature trends, and they are displayed successively.
(6) Skill cheating. Enter the relevant data about the casting of the titanium plate, and perform the calculation according to the calculation formula set. There are roughly two types of these calculations: one is the calculation necessary for production operations or the calculation of operational skill indicators; the other is the collection and calculation of skill parameters or specially displayed data, such as the actual measured values ​​of skill parameters are converted into instantaneous values, Time series, status, maximum value, accumulated (hour, shift, day, ten, month, half year, etc.) data and other files form a table, curve and display and print system for the operator to call.
(7) The data appears. Data display includes public screens (CRT screen list, menu, computer restart, data setting, etc.), skill flow screens, CRT data processing screens (measurement value of each process data, channel, scan status, collection permission symbol, status, Unprocessed raw data and other screens), mathematical models and skill calculation results, as well as special display screens and processing screens for setting control or operation guidance (such as processing of each silo level and inventory, alloy weighing and participation processing, and processing time Screen), skill parameter screen (such as time series curve, trend curve, historical data curve, etc.), information and disposal performance screen, various report screens, etc.
(8) Data description. Data records include printing daily reports, monthly reports, alarm records, injection or input volume reports, and hard copies of display screens.
(9) Data communication. Data communication includes vertical and horizontal communication. Vertical communication with upper computer (regional computer or factory management level) and lower computer (PLC, DCS, etc. at the base level), horizontal communication with converter computer, Electric furnace computer, continuous casting computer, analysis intermediate computer and other communications.
In the depiction under certain conditions, some of the above functions have been performed by the DCS or PLC at the active level and the central operation supervision station. Especially in those active systems that only require a basic level of initiative, in order to compensate for the lack of basic level of initiative, the function of controlling the process of some processes is included. This is completely reachable with respect to modern DCS or PLC.