The control of this production line mainly adopts on-site control, and is also equipped with a large number of secondary instruments to display and monitor the process parameters such as temperature, pressure, flow, and rotation speed. These instruments have Type II instruments and Type III instruments, none. Memory function, for some important process parameters, can only be recorded by inspection, lack of specifications, data is not accurate. Most of these meters do not have a memory function. Some meters with a memory function are mostly paper recorders. A paper recorder not only needs frequent paper changes, but also has trouble when inquiring about some necessary data.
In order to better manage this production line, key data should be saved and the company leaders can inquire production data through the computer network. Keep abreast of the production situation. The author made a comprehensive comparison of performance and price through various paperless recorders, and finally selected the KH300R type paperless recorder produced by Xiamen Koken Automation Instrumentation Company.
2 Introduction to KH300R Paperless Recorder The KH300R Paperless Recorder replaces the paper and pen of traditional recorders with a large-capacity memory chip, which solves a series of problems in traditional recorders: daily maintenance workload, high operating costs, and reliability Poor, application is not flexible enough.
KH300R type paperless recorder uses a high-brightness monochrome LCD screen as a human-machine interface, with a variety of display screens and Chinese configuration screens. The configuration is flexible and convenient, the display is clear and clear, only four keys are required to complete the meter. Function settings and operations.
KH300R type paperless recorder can accept a variety of input signals such as thermocouple, thermal resistance, current and voltage; can simultaneously have 8 analog input, 12 alarm output, 6 power distribution and 1 RS-232 communication interface upload Go to the computer for display and analysis. KH300R type paperless recorder integrates display, processing, recording, calculation and alarm into one function and can collect, save, and analyze important data in various industrial processes.
3 Application of KH300R type paperless recorder The clinker calcination is the central part of the cement production process, and the main thermal parameters in the clinker calcining system should be examined in detail. Our company used a paperless recorder to check the temperature of the smoke chamber of the cement kiln, four parameters of the speed of the coal feeder, the speed of the kiln draft fan, and the gas flow of the waste heat furnace. The detection and reasonable control of the above parameters are of crucial importance for safe and stable production and guaranteeing the quality of clinker. The voltage signal (mV) generated after thermocouple detection in the kiln chamber temperature chamber can be directly input into the channel of the recorder; the signal of the feeder speed, kiln draft fan speed, and gas flow rate of the waste heat furnace is transmitted. The device has a two-wire system and a four-wire system, and does not require any conversion. The recorder has a corresponding wiring method. The range of compatible signals is relatively large.
The KH300R type paperless recorder is installed in the duty room, and the detected data results are displayed in real time on the LCD screen in numerical values ​​or in various curves. There are four kinds of display screens in the scene, of which the main screen can display the eight parameters detected at the same time. The kiln-headed pyrotechnics can timely adjust the kiln's operation status according to the main screen display results and their own observational experience for many years. If the temperature of the smoke chamber detected on the main screen is too high or too low, the speed of the pulverizer must be adjusted in time to adjust the size of the coal feed to ensure that the clinker is produced with good quality, high yield, and low consumption.
4 KH300R Type Paperless Recorder Communication The KH300R paperless recorder comes with a set of software for U disk data acquisition and analysis. The data stored in the KH300R paperless recorder is read into the computer and automatically converted into the Acess database file. The software is equipped with data acquisition and analysis functions for management operations.
The distance between the kiln duty room and the production office is about 100 meters. We chose the RS-232/485 converter. This will establish a communication between the paperless recorder and the statistical computer in the production office. The computer has been connected to our factory's local area network. Production data can be read once per class (or even shorter), and company leaders will be able to keep abreast of the old line's production information through the LAN. The model we choose has 128M U disk storage capacity, because reading is frequent, the data collection set time interval can be appropriately shortened, so that the production data is more detailed, more able to reflect the actual production.
The included software is very powerful, making the acquisition process very simple. The stored data can be read into the computer through the menu in the software. With this software, production data can also be conveniently displayed in various charts. More intuitive to reflect the production status. Print from the printer for long-term storage or management of production use.
Recorder on-site data detection, according to the user's own set of scope alarm, the test results are real and reliable, so that the kiln to see the pyrotechnic kiln to ensure that the kiln is always in a good state of operation provides timely and reliable information and evidence to achieve Use the effect that closed-loop control system can bring. After nearly two years of use, its advantages and effects are as follows:
(1) The control of the kiln smoke chamber is stable and well documented, basically eliminating high temperature operation. Before installing the recorder, the temperature of the smoke room during the shift is extremely high and the responsibility is unclear. After installing the recorder, the temperature of the smoke room during the shift can be accurately determined to provide basis for the assessment; and the temperature control of the smoke chamber is also accurate. The data has ensured the effective implementation of the process system and greatly reduced the ringing phenomenon.
(2) It has effectively supervised the control of the kiln exhaust fan speed. The number of fan rotations directly controls the amount of ventilation in the kiln. Before the recorder is installed, there is no effective monitoring means for negative pressure control. After the recorder is installed, the speed of the exhaust fan can be effectively monitored, which plays a positive role in the stable operation of the rotary kiln.
(3) Monitoring the speed of the feeder. In order to ensure the stability of the smoke chamber temperature, it is necessary to adjust the speed of the coal feeder in time. Since the use of a recorder, the rotation speed can correspond to the kiln temperature and the pulverized coal combustion can be obtained.
(4) Detection of gas flow in waste heat furnace. Before installing the recorder, some see the pyrotechnics change the metering sensor by artificial means, resulting in false high yield. In order to prevent this from happening, the gas flow in the waste heat furnace needs to be detected. By comparing the curves, it is possible to locate the false high production time.
5 Concluding remarks After nearly 3 years of use, we believe that the recorder's measurement accuracy, display readings, and data records are all satisfactory and basically reach a maintenance-free state.
Application of KR300K Paperless Recorder in Cement Production
1 Introduction Inner Mongolia Prairie Green Cement Co., Ltd. is a 100-year-old cement plant that produces a variety of ordinary Portland cement. After the transformation of the old factory in 1994, a 300t/d old production line still remains.