Cooling and blowing device for radar level gauge and material level detection system

Abstract

The invention relates to a cooling and blowing device for a radar level gauge and a material level detection system. The cooling and blowing device comprises a first branch circuit which is provided with a flow regulating valve and a first opening and installed on a sealed container, a second branch circuit which is provided with a reducing valve and a second opening and installed on the side wallof the sealed container, a main circuit connected with air inlets of the first branch circuit and the second branch circuit so as to receive gas, a differential pressure transmitter and a controller,wherein two pressure measuring openings of the differential pressure transmitter are connected with the first opening and the second opening respectively, and the controller is connected with the differential pressure transmitter and the flow regulating valve. The controller can regulate the opening of the flow regulating valve according to a detection value of the differential pressure transmitter, the air outlet of the first branch circuit cools and blows the transceiving end of the radar level gauge so as to lower the influence of gas with high temperature, dirt, moisture and pressure inside the sealed container on the radar level gauge, pressure changes of the air outlet of the first branch circuit are in positive correlation with pressure changes inside the sealed container, and therefore the purpose of lowering energy consumption is achieved.

Description

technical field [0001] The invention belongs to the technical field of material level detection, and in particular relates to a detection device and a material level detection system for a material level in a sealed container. Background technique [0002] The radar level gauge transmits high-frequency pulses from the radar antenna, propagates in space at the speed of light, reaches the measured object and reflects back, and detects the distance and material level through the time required for pulse propagation. Traditional radar level gauges are widely used, and the detection effect is better, but when detecting the material level of materials in high-temperature, dirty, wet and pressurized sealed containers (such as reaction tanks or reactors, etc.), due to the high temperature in the sealed container, Large dust and high humidity make it very easy to interfere with the detection of the radar level gauge and affect the detection accuracy of the radar level gauge. [0003]...

AI Technical Summary

Problems solved by technology

But the cooling and purging device ignores the interference of the pressure fluctuation in the sealed container to the cooling and purging device. The output pressure of the air outlet for cooling and purging) remains unchanged, so that the amount of gas entering the sealed container drops instantly, forcing its cooling and sweeping effect to drop sharply, and even the detection accuracy of the radar level gauge cannot be guaranteed; and when the sealed container When the internal pressure drops, and because the sweeping intensity of the cooling and purging device remains unchanged, the amount of gas entering the sealed container rises instantaneously, but the sweeping of the radar level gauge does not require so much gas at all, resulting in a large amount of excess gas Into a sealed container, extremely wasteful of energy

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