Automatic control system for the most burning proc

2022-07-31
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The automatic control system of sintering process

recovers various technical indexes and functions of the computer to the standards and states specified in the product technical documents, and tests and modifies some hardware and application software by simulating the sintering production process, so that the control function of the whole system can achieve the expected goal

the process of restoring various technical indexes and functions of the computer to the standards and states specified in the product technical documents, and testing and modifying some hardware and application software by simulating the sintering production process, so that the control function of the whole system can achieve the expected goal

the main body of the sintering process control computer consists of two parts: batching control and sintering control. The control objectives are: (1) good raw material and fuel ratio control to save furnace burden; (2) Stable raw material supply, appropriate sintering speed and sinter strength control to stabilize output and ensure quality; (3) Stable operation, monitor the process, timely and accurately process information, so as to master the production status and improve the operation. The commissioning includes six parts: preparation before commissioning, data processing function commissioning, batching control function commissioning, sintering control function commissioning, data communication function commissioning and system commissioning

before commissioning, the system commissioning can be carried out only after the equipment installation is completed, the hardware configuration is complete, and the software is loaded. The system commissioning personnel should carefully read the technical specifications of hardware and basic software, the interface table between computer and electrical and instrument equipment, process input and output table, application program specification and application program list, fully understand the purpose and content of system control, and prepare the commissioning scheme, Prepare commissioning tools, instruments and materials

the debugging computer of data processing function sends the process parameters to be collected into the data area after analog-to-digital/analog conversion and pulse value conversion. The data at each point are linearized, compensated, moving average, digital filtering, unit conversion, etc. according to the predetermined processing table. After preliminary analysis and processing, they are stored in relevant documents for control calculation, report printing and screen display. During commissioning, use the signal generator to add analog signals to the corresponding terminals according to the units and ranges specified in the process input and output table, so as to view the printed relevant documents, observe the reports and pictures, and check the correctness and accuracy of data positions and values

batching control function commissioning the batching volume of each storage tank is determined by the total transfer volume and mixing coefficient calculated by the material level control of the raw material tank, and the ratio is set according to the production experience; The blending coefficient is calculated according to the ratio and the moisture content of raw materials and fuels. Due to the different coordinate positions of each storage tank in the conveying system, in order not to cause confusion in raw material proportioning when starting production or stopping the machine, the calculated set value of material volume of each storage tank shall be output to the quantitative feeder control panel for batching control after delay processing according to the coordinate positions of each storage tank. During commissioning, the type of raw materials in each storage tank and the quantity in stock shall be recorded in relevant documents. Use the signal generator to add the analog signal of the measured discharge value of each slot to the corresponding terminal. Set the ratio, moisture content of raw materials and fuel and total transmission capacity on the terminal screen. Then check whether the batching setting value and setting time of each tank are correct on the screen cost high and feeding control panel, and check the functions such as deviation accumulation and zero check of inventory quantity

sintering control function debugging there are many control loops in the sintering production process, the parameters interact, the raw materials, products and output should be adjusted frequently, and the delay time of the system is very long. Therefore, the debugging of sintering control function is the focus of the whole system debugging (see Figure). The control functions include adding water and raw material tank level control, return ore tank and bedding tank level control, permeability and ignition temperature control, ignition intensity control, trolley loading density and thickness control, firing point control, etc. The computer obtains, processes and displays the quality and composition information from the sinter automatic analysis equipment and the analysis management computer, and provides operation guidance to adjust the proportioning ratio and bellows temperature, so as to keep the composition, alkalinity and pulverization rate stable. The above functions are realized through subroutines such as data communication, data tracking, periodic startup and proportional integral derivative (PID) control. In the early 1980s, the setting point control (SPC) mode was widely used in the sintering process control computer. During commissioning, the control cycle and parameters in the control model should be set loop by loop. In the late 1980s, the task of the sintering process control computer shifted from process control to production management. The computer was connected with electrical and instrument equipment by means of data communication, and the software aided test system was mostly used for system commissioning. The method is: disconnect the hardware connection between the sintering process control computer and the electrical and instrument equipment, formulate the event and time correspondence table according to the process flow sequence, mainly including the process real-time signals and communication messages, and also consider the time-related data, such as the mixture on the front trolley at any time and the sinter on the back trolley of the furnace according to the statistics of the sponsor, according to the equipment constants and process flow, Several corresponding tables of data and time are given for automatic generation of data at any time by interpolation method in system debugging. Before the system commissioning, Shandong Sida hi tech mechanical equipment Co., Ltd. will introduce the test method of the fatigue testing machine: first read the event table and data table into the system, and prepare the main program and corresponding work program that can parse the sentence format to register in the system, and specify the task level, task number and file number. During the system test, start the software aided test system to generate the required process signals and message data to make the application system run. With the help of printing documents and screen display, the system test is completed

data communication function debugging information is exchanged between sintering computer, raw material computer and analysis computer, and between computer and electrical and instrument equipment through special communication circuit. Before no-load commissioning, check the communication circuit continuity, transmission message format and control and management functions of communication program package. There are two methods for debugging communication functions. One is to manually generate conditions for receiving and sending signals to complete data transmission; The other is to disconnect the application software from the communication program package, compile a test program with man-machine dialogue function, which can test and check all types of messages one by one, and confirm the receiving and sending signal results through the keyboard and printer. This method is simple in structure and easy to use

the no-load commissioning stage of system commissioning mainly assesses whether the information between computers, between computers and electrical and instrument equipment is correctly transmitted and whether it is easy to clean, and further finds out the problems not exposed during function commissioning. Process signals that cannot be generated during no-load commissioning can be solved by adding analog signals manually. Thermal load commissioning is to assess the system function and finally set the control parameters under the condition of ignition with materials

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