1.
The introduction material level is one of the main measurement parameters of coking coal preparation production process, but due to uneven material planes, such as coal material rest Angle, material level detection is more difficult, contact measurement is a major means of measurement of material level in the past.
With the development of the automatic control of high and new technology, continuous material level measurement is widely used in industry, radar level meter is one kind of mainstream instrument.
In coking plant raw material coal plant of xuanhua iron expansion, all of coal level measurement of radar
level gauge has been adopted, use effect is good.
2.
Type radar material level meter, the basic principle of radar level meter is mainly composed of transmitting and receiving devices, signal processor, antenna, operation panel of several parts, such as launch a reflection receive is the basic principle of radar level meter type work.
Antenna of radar sensor in the form of beam emission ZUI small 6.
2 CHZ radar signal, encounter is reflected measured medium, the antenna reflected echo signal and sending them to the electronic components.
Microprocessor to signal processing, by intelligent software to identify the correct echo signal.
The operation of the radar pulse signal from transmitting to receiving time and the distance of the sensor to the surface of a medium and is proportional to the level: i. e. , h = h -
D D = vt/h for the material level in type 2;
H for slot high;
D as the distance of material surface;
V as the radar wave velocity;
T for radar wave transmitting to receiving time interval;
Electronic parts through analysis, calculation and distance on the surface of the probe is given to the media, and outputs the corresponding signal.
3.
Characteristics of radar wave radar level meter is a kind of special form of electromagnetic waves, encounter obstacles are easy to be reflected, and its penetrability is strong, can travel through space, dust and other interference source of steam.
Radar level meter is using the special performance of electromagnetic wave detection of material level.
All kinds of solid materials stored in the library or barn, there are material rest Angle, echo reflection would like ultrasonic is diffuse, the disturbance echoes and fake, because of radar level meter using the advanced echo processing and data processing technology, can eliminate interference echoes and false by the software, combined with high frequency radar wave itself, open Angle is small, good penetration performance characteristics, so the radar material level meter is better than contact material level meter and the same kind of non-contact material level meter is more excellent performance.
4.
Radar coal material level measuring system is currently used most of the radar material level meter is a product of integration and two wire of power supply, 4 ~ 20 ma output analog signal, at the same time also provide HART digital signal, and a variety of protocol of fieldbus digital communication function, and computer monitoring system is very convenient, as well as at the scene debugging;
Also can use the PC in the control room.
Xuanhua coking plant according to their own conditions, in the old and new raw material blending system and controller adopted ABB AC800 Siemens S7 - for the company
The 300 series PLC controller to monitor.
Using the system to provide the configuration program, material level monitoring program implementation.
Below is applied AC800 controller monitors a coal bunker level configuration program.
5.
Installation and maintenance of 5.
1 the installation of radar level meter can know from radar material level meter measuring principle, radar material level meter is by processing radar wave from the probe to the surface of a medium and then return to the probe to measure the material level, therefore, the correct installation is to realize the accurate measurement.
(
1)
Sensors do not install in the center of the vaulted tank, or interfere with the echo signal loss.
Also can't close to the tank wall installation, ZUI preferred installation position 12 radius of the container.
From the tank wall ZUI small to 30 cm.
(
2)
To avoid feeding mouth, lest produce false reflection.
(
3)
Avoid false in firing Angle of the reflection of the device.
Especially to avoid from the antenna ZUI nearly a third of the conical emission zone have obstacle device (
Because the closer barrier device, the stronger the false reflected signal)
。
(
4)
Radar antenna tilt towards the tank wall.
5.
2 maintenance due to the volatilization of measured medium gas will gather on the antenna, in which water vapor leaves the antenna on coalescence, at this point, will affect the radar wave emission, serious when radar wave can't send out, so should be conducted on a regular basis according to the measured medium situation radar material level meter antenna for cleaning maintenance.
6.
Conclusion coal bunker coal level measurement is for production line automation system an important part of.
Make full use of various control means, make the process of each link strict control and execution, can achieve the purpose of stable yield, superior production, cost-effective.
Radar level meter for its accurate safety, no maintenance and reliability characteristics of successful application in xuanhua iron in the coking plant of coal level measurement, lifted the coal level measurement.
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