How to Correctly Use Radar Level Gauge in Sewage Treatment

The sewage homogenization tank is used to homogenize the water quality at different times and adjust the water volume. It is an important equipment that affects the sewage treatment effect. Keeping a certain amount of water in the tank is the prerequisite for doing a good job in sewage treatment. Therefore, the accurate measurement of the liquid level of the homogenizing tank is particularly important for the normal operation of the water treatment. The liquid level of the homogenizing tank was originally measured by the blowing method, but the pressure pipe was often blocked and condensed, which brought many difficulties to the operation and maintenance of the instrument. For this reason, a new set of BM70 radar liquid level gauge produced by Jiujiu Instrument Co., Ltd. was installed in June 1997 to monitor the liquid level gauge of the homogenizing tank. Introduction to Radar Level Gauge Radar level gauge is a new type of instrument that has been gradually applied in my country in recent years. It uses electromagnetic waves (microwaves) for continuous non-contact liquid level measurement, and is specially used for liquid level measurement of storage containers for liquids, pastes and slurries. It is not affected by the upper gas density and thermal stratification of the material in the container, even if the air in the container contains smoke, dust or noise during the filling process. It can also ensure accurate measurement. The radar level gauge consists of a probe and a signal converter, which can be used for on-site indication or remote indication (outputting 4-2/hnA standard signal) or connected to a microcomputer. Working principle BM70 radar level gauge is based on FMCW (frequency modulation The work is based on the continuous wave radar method. A microwave frequency-modulated signal with a fixed amplitude is transmitted through the antenna and reflected off objects. The reflected microwave signal is received after an interval and mixed with a portion of the transmitted signal. The output signal frequency of the mixer is proportional to the interval time, so it can accurately reflect the distance (liquid level) between it and the surface of the measured medium, as shown in Figure 2. Installation, commissioning and improvement measures The installation of the radar level gauge Bl''''d70 is required to be on the same level, and the microwave hole area should protrude from the connecting device. It cannot be installed near the connection pipe of the outlet of the storage tank, and should be installed as far away from the interference source as possible. The place. Figure 3 and Figure 4 are wrong installation methods. The correct installation method is shown in Figure 5. Pay attention to the following two points during installation: 1) In order to eliminate the influence caused by invalid vibration, the method of strengthening the short tube is adopted to reduce the vibration of the instrument. 2) The instrument piping was not fixed during the original installation, and the liquid level of the instrument fluctuated greatly. By adopting the method of fixing the bracket and then welding, the barium j measurement error caused by the shaking of the piping is avoided. In the actual operation process, it is found that sometimes the liquid level indicated by the instrument is not zero when the homogenizing tank is not filled with sewage. We calibrated the instrument through the program programmed in the computer in advance, and found that the internal interference signal of the instrument was very strong. We eliminated the interference signal, re-adjusted and zeroed, and the instrument entered the normal liquid level display state. The use effect has been proved by more than one year of operation. This set of liquid level gauges has good performance, stable operation, low maintenance workload, intuitive indication (the primary meter directly displays the liquid level height, and can also be transmitted to the operating room remotely), and is easy to operate. , It can work normally in the environment containing oil and oil gas, and it can also be abnormal when cast at 8o ℃. The author believes that for petrochemical sewage treatment, using this instrument for liquid level measurement has advanced technology, reliable performance and strong practicability.

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