A liquid nitrogen automatic fire extinguishing and explosion suppression system in an oil tank area

Abstract

The invention discloses an automatic liquid nitrogen fire-extinguishing and explosion-suppressing system for an oil tank region. The automatic liquid nitrogen fire-extinguishing and explosion-suppressing system comprises a liquid nitrogen storage station, a low-temperature liquid nitrogen booster pump and a monitoring-jetting integrated box, wherein the monitoring-jetting integrated box comprises a housing, a glass ball expansive type constant-temperature fire detector with a glass ball fracture free surface, an expanding cavity and a horn-shaped outlet; the glass ball expansive type constant-temperature fire detector, the expanding cavity and the horn-shaped outlet define a low-temperature nitrogen gas cavity; the top of the liquid nitrogen storage station is connected with a self-lifting buffer tank through a gas exhaust interface; the self-lifting buffer tank communicates with the low-temperature nitrogen gas cavity through a housing upper interface; the low-temperature liquid nitrogen booster pump is connected with an inlet of a low-temperature ball valve; an outlet of the low-temperature ball valve is connected with the glass ball fracture free surface through a rear section of a gas storage tube; a connecting line is arranged on the rear section of the gas storage tube; a pressure feedback device, a fire-fighting linkage controller and an alarm are sequentially connected on the connecting line; and the alarm is connected with a control end of the low-temperature ball valve. The system can solve the fire efficient response problem, the liquid nitrogen effective conveying problem, the liquid nitrogen efficient atomizing problem and the liquid nitrogen diffusing problem, so that the purpose of automatically and efficiently suppressing explosion and extinguishing fire in an oil tank is achieved.

Description

technical field [0001] The invention belongs to the field of oil tank security, and in particular relates to a liquid nitrogen automatic fire extinguishing and explosion suppression system for an oil tank area. Background technique [0002] At present, oil tank storage is the most common way of oil storage, and the largest floating roof storage tank for storing crude oil has reached 20×10 4 m 3 , the largest internal floating roof storage tank for storing and transporting refined oil has also reached 5×10 4 m 3 . The LASTFIRE project organized by 16 oil companies including BP and Shell, which is under the charge of Resource Protection International (RPI), shows that 15 to 20 large-scale petrochemical storage tank fire accidents occur every year. In recent years, oil tank fire and explosion accidents have occurred frequently in our country, especially in the process of oil tank renovation, construction, and operation, there are great fire hazards. [0003] The traditiona...

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Problems solved by technology

[0003] The traditional firefighting systems in oil tank farms are mostly based on firefighting water systems and foam firefighting systems. When water is used to extinguish a fire, when water is mixed in the oil and burned, some of the burned oil will overflow a large amount, and some will violently spray out from the tank to form a fire. The huge fire column with a height of 70-80m can reach about 120m in the downwind direction of the fire column, which is easy to directly burn to the adjacent oil tank and expand the affected area; foam fire extinguishing has delay, which is generally suitable for covering fire on the ground, and its poor fluidity makes The fire-fighting efficiency is low; in addition, the traditional fire-fighting technology for oil tank farms is mostly passive emergency fire-fighting by fire trucks, which not only does not extinguish the fire in time, but also pollutes the oil in the oil tank, causing the oil to be scrapped

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