The role of radar level gauge in cement industry

Radar level gauge is a commonly used measuring instrument, which is widely used in petroleum, chemical industry, water conservancy, shipbuilding, industry, electronics, machine tools and other industries. Among them, the radar level gauge also has certain applications in the cement industry, and it plays a very important role. Measuring principle and main technical factors of radar level gauge: Radar level gauge uses echo ranging principle. The transmitting antenna emits microwaves to the measured target, and the microwaves of the measured target are received by the receiving antenna. The signal processor compares the transmitted signal with the received signal, calculates the measured distance, and calculates the corresponding level value. 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. In addition to the horn antenna (horn mouth) and the rod antenna, the existing antennas also have Planar antennas and parabolic antennas are used for materials with a small dielectric constant. The cables are used as antennas or waveguides are installed. The cables and waveguides extend to the bottom of the warehouse or warehouse, thereby transmitting and receiving electromagnetic waves. Enhanced echo signal. In a cement factory, various solid materials are stored in warehouses or warehouses, and there is an angle of repose of the material. The echo reflection will also have diffuse reflection like ultrasonic waves, resulting in interference echoes and false echoes. The interference echoes can be eliminated by software. And false echo, but the effective echo intensity will be reduced a lot, so when designing and selecting models, attenuation should be considered, and a certain margin should be left in the range selection. Selection of radar level gauges: pulse radar level gauges Radar level gauges used to measure material levels are usually divided into two categories: pulse radar and frequency modulated continuous wave radar. In the process monitoring occasions, the pulse radar is mainly used. Due to its low frequency (6.8GHz), and the influence of condensation and material accumulation in the design of the antenna structure, it can also use the echo signal processing in the ultrasonic level gauge. Effective echoes can also be identified in complex working conditions such as mixers, and the price is relatively cheap, so pulse radar is mainly used in the cement industry. Selection of granular materials Most of the raw materials in cement plants are granular materials, some of them are block materials, such as limestone, raw coal, shale, etc., and the semi-finished clinker is also granular materials, which are stored in warehouses or warehouses. Angle of repose, but also has a reflective interface. According to the material repose angle and surface conditions formed by feeding and discharging, after determining the effective range, it is recommended to use a non-contact radar level gauge, that is, a level gauge with a rod or horn antenna. The selection of powdery materials generally has 4 to 8 cement silos in cement plants and grinding stations. There are also raw meal homogenization silos and fly ash silos in cement plants. bit. The surface of the powder in the warehouse is extremely loose, and microwave reflection is quite difficult. For this reason, it is recommended to use a contact radar level gauge, or a non-contact radar level gauge with a large flange and a horn antenna. The more typical products are: Cable-type radar level gauge, it actually uses the cable as both an antenna and a waveguide, combining the two into one, the microwave pulse is sent out from the probe and propagates along the cable, and when the pulse hits the material surface, it will be reflected back, and its The measuring range can reach 35m, and the minimum is 1.6. In addition, the wear resistance and maximum pull-down force of the cable can meet the inspection requirements of various powder warehouses in cement plants. At present, many cement plants have used cable-type radar level gauges to measure the material levels of homogenization silos, cement silos and fly ash silos, and achieved good results. Most of the radar level gauges currently used in the two-wire system are integrated products, powered by the two-wire system, which can directly control the modules of the system and output 4-20mA analog signals, which can save a lot of cables; at the same time, it also provides HART digital signals and various The field bus digital communication function of the protocol is very convenient to connect with the computer monitoring system. It can be debugged on site or in the control room with a PC. If the FCS system is formed, it can also be debugged at the operator station. Conclusion The level measurement of the cement plant is an important part of the automation system of the cement production line. The application of the radar level gauge relieves people's doubts about the level measurement of the cement plant. , pressure resistance, high temperature resistance, explosion-proof and other aspects can meet the requirements of cement plant inspection and control.

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