Device and method for measuring foam mixing ratio of foam fire-fighting system based on density method

Abstract

The invention relates to a device and method for measuring the foam mixing ratio of a foam fire-fighting system based on a density method. The device comprises a foam mixed liquid collecting box, wherein the foam mixed liquid collecting box is provided with an ultrasonic liquid level meter and a density meter, the ultrasonic liquid level meter is connected with a plurality of electromagnetic valves arranged on all the most disadvantageous loop headers, each electromagnetic valve is correspondingly connected with a most disadvantageous loop nozzle of the foam fire-fighting system, and when the ultrasonic liquid level meter measures a high liquid level signal of the foam mixed liquid collecting box, the electromagnetic valves are triggered to be automatically closed; and the density meter is connected with the PLC control system, measures the density value of the mixed liquid in the foam mixed liquid collecting box in real time, and transmits data to the PLC control system. According to the invention, the measurement precision of the foam mixing ratio of the foam fire-fighting system can be improved, the manual measurement error is reduced, and the test device has far-reaching significance for avoiding the influence in a conventional test method and improving digital nuclear power.

Description

technical field [0001] The invention belongs to the design technology of a foam fire-fighting system, in particular to a device and method for measuring the foam mixing ratio of a foam fire-fighting system based on a density method. Background technique [0002] The foam fire extinguishing system of nuclear power plants plays an indispensable role in ensuring the safe operation of the diesel generator body and its ancillary facilities; the foam proportional mixer is the core component of the foam fire extinguishing system, which generates Negative pressure forms a jet-suction effect to make the foam fire extinguishing agent mix with water through the flow orifice; its performance directly affects the actual mixing ratio of the foam liquid and the final fire extinguishing effect. [0003] According to the "Code for Construction and Acceptance of Foam Fire Extinguishing System" (GB 50281-2006), the foam fire extinguishing system should select 4 adjacent nozzles at the most unf...

AI Technical Summary

Problems solved by technology

However, in the actual application process, the above measurement methods are affected by different factors such as environment, human factors, medium quality, test conditions, etc., which will cause the test results to deviate from the expected target, thus affecting the judgment of the test results.

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