Selection and Application of Radar Material Level Meter in Cement Plant

Overview The level parameter of the new dry process cement production line is one of the main measurement parameters for production control. With the improvement of the automation level of cement production and the reliability requirements of the control system, the role of material level measurement and control is becoming more and more prominent, which plays a very important role in production control and management. There are many methods for level detection, such as contact type, non-contact type, limit type, continuous type, 3D level detection, etc. The level measurement of the cement production line is mainly based on solid level measurement, and there is also a small amount of liquid level measurement. The solid materials are mainly block materials, granular materials and powder materials. The dielectric constant, bulk density, temperature and moisture content of these materials are different, and the requirements for measuring instruments are also different. With the development of level measurement instrument technology, the past measurement methods such as contact type and limit type have been seldom used in production control. In the new cement production line, the level measuring instruments are mainly radar level gauges. Features of Radar Level Gauge Radar level gauges began to be used in the late 1990s. The microwave frequency range is 300MHz to 300GHz, and the propagation speed is the speed of light. The microwave penetrating power is strong, the transmission speed is not affected by dust, steam and medium components, and the transmission attenuation is also small. The radar level gauge uses the principle of echo ranging. The transmitting antenna transmits microwaves to the measured target, and the microwaves reflected by the measured target are received by the receiving antenna, and the signal processor compares the transmitted signal with the received signal to calculate the measured distance. Since the microwave has attenuation and interference reflection on the propagation path, the key to the measurement is to be able to receive the reflected echo and identify the effective echo. The received echo energy is related to the transmitting and receiving efficiency of the antenna and the radiation power of the antenna, so the antenna design and shape of the radar level gauge are critical. The received echo energy is related to the dielectric properties of the material surface. The higher the dielectric constant value ε, the higher the reflectivity, and the higher the echo intensity. When the dielectric constant value ε is low, the material will absorb part of the microwave energy, and the echo intensity is also low. Usually the dielectric constant value ε of the material to be tested is required: liquid is ε>1.8, solid ε>2.5. Cement plant solid dielectric constant value ε>2.5, the dielectric constant value ε of cement is 3. Radar level gauges are usually divided into two categories: pulse radar (Pulse) and frequency modulated continuous wave radar (FMCW). Process monitoring occasions mainly use pulse radar level gauges. The currently used pulse radar level gauges are divided into low frequency and high frequency. Compared with the low-frequency pulse radar level gauge, the high-frequency pulse radar level gauge has the following advantages: high energy, small beam angle, small antenna size, and high precision. However, low-frequency radar has low energy and scattered energy, so the launch angle is large and the directivity is poor. The wavelength of 26GHz radar is 11mm, and the wavelength of 6GHz radar is 50mm. When the radar level gauge measures the material level, the radar wave reflection mainly comes from the diffuse reflection of the material surface. The intensity of the diffuse reflection is proportional to the size of the material and inversely proportional to the wavelength. 3 Selection of Radar Level Meter In cement factories, limestone silos, gypsum silos, etc. to store bulk materials, clinker silos to store granular materials, raw meal homogenization silos, cement silos, carbide slag silos, etc. to store powdery materials. The stored materials are different, and the selected instruments are also different. When used to measure the storage body level of bulk materials and granular materials, because these materials are densely packed in the storage, the dielectric constant is stable, and the microwave reflection intensity is high. The dust generated by solid materials during the feeding process is much smaller than that of powder materials, and has little effect on the attenuation of radar acoustic signals. According to the material repose angle and surface conditions formed by feeding and unloading, after determining the effective range, a radar level gauge with a rod or horn antenna is used.

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