Diesel locomotive medium-pressure pump set type water mist automatic fire extinguishing method and system

Abstract

The invention provides a diesel locomotive medium-pressure pump set type water mist automatic fire extinguishing method and system. The interior of a diesel locomotive is divided into a plurality of fire extinguishing areas; each area is provided with a plurality of water mist spray nozzles, and a water supply unit supplies fire fighting water within the pressure range of 1.2-1.8 MPa; a diesel locomotive-mounted accumulator supplies electricity to the water supply unit; and certain amount of water mist additives which can form a water film and an emulsion layer on the surface of liquid fuel are added in the fire fighting water. According to the automatic fire extinguishing method and system, the medium-pressure water mist fire extinguishing technology is adopted, the water mist droplet size is controlled to be mainly concentrated within the range of 150-300 [mu]m, the momentum and penetration force of mist droplets are improved, and the fire extinguishing efficiency is guaranteed; the accumulator at the bottom of the diesel locomotive is directly utilized to supply the electricity, so that the fire extinguishing method and system are not affected by power failure inside the diesel locomotive; and the water mist additives with the quick covering and efficient emulsification effects are adopted, the oil surface can be cooled, fuel evaporation is inhibited, and the water film and the emulsion layer can be quickly formed on the oil surface, so that the fuel is isolated from air, fire extinguishing is achieved, and reburning is prevented.

Description

technical field [0001] The invention relates to the technical field of fire extinguishing for railway locomotives, in particular to a method and system for automatic fire extinguishing of diesel locomotives with a medium-pressure pump group type fine water mist. Background technique [0002] Railway locomotives are important facilities to ensure the normal operation of railway traffic, and at the same time have a high fire risk, especially the fire risk of diesel locomotives is the most prominent. Due to the large oil consumption and oil storage capacity of diesel locomotives, and the high internal temperature during operation, the surface temperature of the exhaust pipe is even as high as 500-800°C, which is much higher than the ignition point of diesel oil. Once the high-pressure oil pipe and its joints leak due to aging, failure, etc. Diesel fuel will cause a fire when it encounters high temperature. If it cannot be extinguished and controlled in time, it may cause a majo...

AI Technical Summary

Problems solved by technology

The traditional water-based fire extinguishing system cannot meet the demand due to its low fire extinguishing efficiency and large water consumption; the high-pressure water mist fire extinguishing system is large in size and has high requirements on water quality, and usually needs to be equipped with a larger normal pressure or high pressure water tank, so it cannot meet demand;

[0005] (2) There is a certain amount of ventilation inside the diesel locomotive during operation, which is difficult to meet the application conditions of total flooding fire extinguishing, so the traditional gas total flooding fire extinguishing system cannot be used; the fine water mist particle size of the high-pressure water mist fire extinguishing system is small, and the momentum and penetrating force are insufficient. It is difficult to achieve the target requirement of quickly extinguishing locomotive fires;

[0006] (3) When a fire occurs inside a diesel locomotive, the engine will be shut down first, and the power supply will be cut off. Therefore, the traditional pump group type water mist and other fire extinguishing systems cannot be used due to lack of power supply;

[0007] (4) The internal vibration of the diesel locomotive is large during operation, and there are certain problems and hidden dangers in the anti-vibration and safety of use of traditional gas and bottle-type water mist and other high-pressure fire extinguishing systems

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