- summary
OHR-G300 series LCD artificial intelligence regulator/adjustment recorder is a product developed according to GB/T 34050-2017 national standard, it absorbs today's computer structure ideas in design: the hardware adopts a new microprocessor with flash memory, expands the large-capacity data storage area, the display adopts 3.5-inch 128*64 high-resolution dot matrix white screen black text LCD screen, the software introduces the framework idea of Chinese WINDOWS, and adopts data compression technology. With USB data dump function, the storage time can be up to 720 days. The product has a self-tuning function, which can automatically find the optimal parameters to achieve a good control effect according to the characteristics of the controlled object, without manual tuning of parameters. The control accuracy basically reaches ±0.1°C, there is no overshoot and undershoot, and the performance reaches the international advanced level. It can be used with various sensors and transmitters to realize the measurement, display and control of physical quantities such as temperature, pressure, liquid level, flow, etc., and cooperate with various actuators to PID adjustment and control, alarm control, data acquisition and other functions of electric heating equipment and electromagnetic and electric valves. The EMC design of the product conforms to the relevant provisions of GB/T17626.2-11, and the product has obtained CE certification. The following is the application of OHR-G320 series liquid crystal artificial intelligence regulator/adjustment recorder in sintering automatic batching.
Second, the market background of the product
As the basic process of steel production, the role of automation in sintering ingredients is becoming more and more prominent. Although most sintering plants attach great importance to it and have invested in automatic batching, some have even been retrofitted more than once, costing a lot of money. However, in the end, it can operate reliably, and the performance investment ratio is very small. According to the requirements of the batching process of the plant, the steel plant adopts the distributed control system based on field instrument communication, and after more than a year of practice, it has achieved the goal of reliable operation and high performance investment ratio, and has accumulated experience for the transformation and design of the automatic batching adjustment system of the sintering plant.
Third, the technical principle of the product
1. Overview of batching process equipment of sintering machine
The sintering batching process is to mix iron ore powder, fuel (coke powder), solvent (limestone, dolomite, quicklime) and cold and hot ore return required for the production of sinter, calculate the batching according to the requirements of blast furnace smelting and the chemical composition of various materials, determine the batching ratio of various materials, and realize batching through weight detection and control of feeding equipment. There are a total of 17 silos used in the batching room of the sintering machine, the details are shown in the following table:
| 仓号 | 1#-5# | 6# | 7# | 8# | 10# | 11# 12# | 13# 14# | 15# 16# | 17# 18# |
| The name of the item | Mix the mineral powder | Coke powder | Coke powder | Pulverized coal | limestone | dolomite | quicklime | Cold return | Hot re-mineralization |
| Feeding method | disk | disk | Drag | disk | disk | disk | screw | Drag | disk |
| Control mode | The inverter changes the feed volume |
2. Control methods
The whole batching control adopts the external given control of artificial intelligence PID, and controls the feeding equipment according to the proportion of the material by detecting the weight of the material, and the feeding equipment changes the feeding amount by the frequency converter to realize the batching.
Fourth, the application of the product
In view of the problems existing in the traditional automatic sintering batching control system, in-depth analysis of the on-site process and management status, combined with the latest measurement and control practical advanced technology, the design scheme features the following characteristics:
1. The system adopts a distributed control mode based on field instrument communication
This design connects the belt scale, punch flowmeter, radar level meter, artificial intelligence regulator, etc. with the host computer communication through the Hongrun intelligent instrument with on-site communication function to form a distributed control system based on on-site communication.
The field instrument communication adopts the MODBUS communication protocol based on the master-slave protocol principle. It is characterized by communication only read and write two instructions, the upper computer software is easy to write, and can be used as the upper computer, the application of its software resources is abundant, the development of the advantages of extremely fast. Compared with analog transmission, it has the advantages of easy debugging and maintenance and higher accuracy.
2. System superiority
1) High reliability
Photoelectric isolation technology is used to isolate the communication interface from other parts of the instrument. When the communication interface or line fails, the belt scale and regulator can still work normally. Due to the use of low-level digital signals and the continuous average of the phase is zero, the anti-interference ability is strong. Simple wiring, easy maintenance, accurate data transmission. The fault between the detection and control equipment between the single machine does not spread, and the fault between the upper and lower computers does not spread, and the impact of the fault on the whole system is minimized, which greatly improves the reliability of the system. Flexible and flexible automatic conversion methods. It can be converted on the upper computer, the basic regulator, the inverter and the operation box, which solves the problem of slow emergency response in case of failure.
2) The upper computer has strong data processing ability and more abundant monitoring program functions
Because the data is collected by communication, and part of the statistical data of the single machine is completed by the lower computer, the upper computer mainly processes system data, which can free up more time and memory to process more function-rich applications.
3) Investment Provinces
The host computer does not use the analog input and output module and the corresponding cabinet, and also eliminates the need for hot standby host computer. At the same time, there is no need to add common hardware when adding a single machine, saving system expansion costs. In addition, it saves signal cables and installation and commissioning costs. It also has low requirements for the quality of use and maintenance personnel, saving training costs. The key to achieving high-precision automatic adjustment is the correct selection of the regulator.
3. Hongrun instrument configuration
This design selects Hongrun OHR-G320 series PID regulator with on-site communication function and artificial intelligence adjustment formula. Compared to general regulators, it reduces overshoot while increasing responsiveness. When the error is large, the fuzzy algorithm is used to adjust to completely eliminate the phenomenon of PID saturation integration, and when the error tends to be small, the improved PID algorithm is used for adjustment. It has a function that automatically learns the characteristics of the system and handles changes in the given value and the measured value separately. It has a variety of setting methods, which can be set digitally directly on the panel buttons, or analog settings on a given terminal outside it. In order to prevent abnormal overshoot, it also has the function of presetting the upper and lower limits of the control quantity. At the same time, the debugging is simple and has little impact on normal production. The structure type is hot-swappable, which is convenient and quick to replace.
4. Product application pictures
5. Product pictures
5. Concluding remarks
After two years of operation practice, the system works stably and reliably, which reduces the labor intensity of operation and maintenance personnel. Due to the automatic detection and adjustment, the manual running plate weighing is greatly reduced, and more time can be freed up for inspection, and the hidden dangers of treatment can be found in time, thereby reducing the sudden accident and its processing workload. At the same time, the alarm is accurate and timely, which also reduces the workload of interference and fault handling. In particular, the material change and manual and automatic conversion are in place at one time, which not only enhances the real-time control, improves the control accuracy, but also reduces the labor intensity of repeated weighing. The human-machine interface is intuitive, the functions are simple to operate, and there is also a help menu, which is convenient and easy to learn. The monitoring program has strong man-machine dialogue ability, which is convenient for process management, improves the sense of responsibility of operators, reduces abnormal fluctuations, and promotes the improvement of production indicators.