Pressure-temperature dual-mode-based ship fixed carbon dioxide steel bottle fire extinguishing agent inventory monitoring device and method

Abstract

This invention discloses a device and method for monitoring the extinguishing agent inventory of fixed carbon dioxide cylinders on ships based on a pressure-temperature dual-mode approach. The device includes a pressure sensor, a temperature sensor, a computing unit, and a communication module. The pressure sensor's pressure-sensing diaphragm directly contacts the medium inside the cylinder, and the temperature sensor probe is thermally coupled to the inner wall of the valve body via a heat-conducting metal component. The computing unit determines the phase state based on temperature: when the temperature is below the critical temperature, it calculates the mass based on a gas-liquid two-phase model; when the temperature is above the critical temperature, it calculates based on a supercritical model. The communication module supports redundant switching between wireless and wired dual-mode operation. This invention also provides a system and method including multiple monitoring devices, an alarm control box, and a cockpit monitoring terminal. This invention achieves high-precision mass calculation and leakage early warning, features a double-sealed explosion-proof structure, and a self-calibration function. It solves the problems of inefficiency in manual weighing, large errors from single sensors, and poor environmental adaptability, and is suitable for intelligent monitoring of ship fire protection systems.

Images