Design method of IG541 gas fire extinguishing system

Abstract

The invention discloses a design method of an IG541 gas fire extinguishing system which essentially consists of a high pressure gas storage bottle, a gas delivery pipeline, a pressure reducing device, a gas nozzle, a fire detection device and a gas blowing controlling system. A dynamic design calculation method is adopted by the method, high pressure gas is blown to each protective area through the pipeline from the gas storage bottle, the continuous change process of gas pressure and flow of each node in the pipeline system is dispersed, the continuous process is dispersed by overlaying 0.1s time slides, the gas pressure and flow in each time slide is considered to be constant in the current time slide, the pressure and gas flow of each node in the pipeline system are calculated in each time slice respectively so as to carry out design calculation of the pipeline system in the gas fire extinguishing system. By adopting a dynamic design philosophy, the calculation result is accurate and scientific, thereby not only extinguishing fire reliably, but also ensuring that people are not suffocated as a result of large amount of gas blown in the protected area in the case of fire.

Description

technical field [0001] The invention relates to a design method of a gas fire extinguishing system, in particular to a design method of an IG541 gas fire extinguishing system. Background technique [0002] The fixed gas fire extinguishing system is an automatic fire extinguishing facility configured for places where there is no water damage or places with expensive live equipment. IG541 gas fire extinguishing system, also known as clean gas fire extinguishing system, the fire extinguishing agent used is a mixture of 52% nitrogen, 40% oxygen, and 8% carbon dioxide. Ansu company develops, produces and promotes the application, and the business name is "INERGEN". Since the fire extinguishing agent is released, the loss to the protected environment, people and property is zero, so it has been widely promoted and applied at home and abroad. Its core technology is how to effectively control the fire extinguishing time (fire extinguishing agent injection time), fire extinguishing ...

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Problems solved by technology

[0070] The calculation method given in the "Design Code" is a very imprecise design calculation method, which is only suitable for the estimation of the balanced pipe network system, not suitable for the design calculation of the unbalanced system. It has the following problems: (1) No. 2 The pressure in front of the pipe network calculated in step 1 cannot represent the average pressure of the pipe network. When calculating the pressure loss of the pipe network, the design flow and the pressure calculated in steps 2 and 3 are taken as the flow and pressure in the average state, which is There is no theoretical basis, in fact, under the "average pressure" calculated by the formula listed in step 2, the total flow of the pipe network system is not equal to the total design flow; (2) more often used in design calculations The method of look-up table is used for calculation, the calculation result is inaccurate, and it is not conducive to computer program calculation; (3) The calculation of spray time, spray time and actual fire extinguishing agent concentration in each protected space are not mentioned in this design method. This parameter is crucial to the design of the IG541 system pipe network, because the design concentration of each protection space must reach 95% of the design concentration within 60s, only in this way can the purpose of rapid, safe and reliable fire extinguishing be achieved

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