Design method of a heptafluoropropane gas fire extinguishing system
A fire extinguishing system, the technology of heptafluoropropane, applied in the design field of heptafluoropropane gas fire extinguishing system, can solve the problem of no calculation method for the length of time
Active Publication Date: 2019-07-16
浙江信达可恩消防股份有限公司
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The important and difficult point of the design method of this patent is: due to the nature of the heptafluoropropane gas fire extinguishing agent itself, the spraying time of the fire extinguishing agent must be controlled within 10s, which has always been a difficult point in the design and calculation process, and it must also be guaranteed; Also, the calculation of the maximum working pressure on the nozzle has not been very clear, but this is an important parameter of the system; in addition, there has been no calculation method for the length of time for the initial liquid level to reach the nozzle
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[0223] A design method of a heptafluoropropane gas fire extinguishing system, the fire extinguishing system is mainly composed of a high-pressure fire extinguishing agent storage bottle group 1, a fire extinguishing agent delivery pipe network 2, and a nozzle 3, and also includes a fire detection device, a pipeline control starting device and a starting bottle group, The spraying process is as follows: the fire detection device in the protection zone senses that the temperature on the spot rises or the concentration of smoke rises, and the signal is buried by the pipeline control starting device. After a period of delay, the circuit controls to open the bottle of the starting bottle group 1. Head valve, start the high-pressure nitrogen in the bottle group to open the container valve of the fire extinguishing agent storage bottle group 1, and the fire extinguishing agent flows through the riser 7 and the high-pressure hose 8 under the action of the high-pressure nitrogen in the s...
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The invention relates to a design method of a heptafluoropropane gas fire extinguishing system. The fire extinguishing system is mainly composed of a high-pressure fire extinguishing agent storage bottle group connected in sequence, a fire extinguishing agent delivery pipe network and nozzles. The fire extinguisher delivery pipe network includes a main pipe, a high pressure fire extinguisher The riser pipe and high-pressure hose connected to the agent storage bottle group, the branch pipe connecting the main pipe and the nozzle, and the high-pressure hose are connected to the main pipe through the header. The present invention adopts a dynamic design calculation method to transfer the high-pressure liquid from the high-pressure fire extinguishing agent storage bottle In the process of spraying a group of streams through the fire extinguishing agent delivery pipe network to the nozzles in each protection area, the process of continuous change of the pressure and flow rate of the liquid at each point in the fire extinguishing agent delivery pipe network is discretized, and a continuous process is discretized into numerous The time segments of the time step ∆t are superimposed, and the pressure and flow velocity in each time step are regarded as constant, and the pressure and velocity of the liquid at each node in the pipe network are calculated in each time step.
Description
technical field [0001] The invention relates to a design method of a gas fire extinguishing system, and is mainly aimed at the design method of a heptafluoropropane gas fire extinguishing system. Background technique [0002] Heptafluoropropane gas fire extinguishing agent, also known as HFC-227ea, FM-200, is stored in a liquid state under a certain pressure. It is a colorless, odorless, non-conductive, and non-secondary pollution gas. It has the characteristics of cleanness, low toxicity, good electrical insulation, and high fire extinguishing efficiency. In particular, it has no damage to the ozone layer and has a relatively long residual time in the atmosphere. Short, its environmental protection performance is obviously better than halon, it is a kind of clean gas fire extinguishing agent that has been successfully researched and developed so far, and it is considered to be one of the most ideal products to replace halon 1301 and 1211. Heptafluoropropane gas fire exting...
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IPC IPC(8): A62C31/03A62C37/40
Inventor 陈建李鑫邓红王江陵钟允晖
Owner 浙江信达可恩消防股份有限公司