Fixed foam fire-extinguishing system

Abstract

To provide a fixed foam fire-extinguishing system that can achieve adequate fire-extinguishing performance even with a foam output of less than 8.0 L / min per 1 m2 floor area, by improving the fire-extinguishing performance of synthetic surfactant foam extinguishing agent free of fluorine-based surfactant.SOLUTION: A fixed foam fire-extinguishing system 1 causes an aqueous solution which is a mixture of fire extinguishing water and foam extinguishing agent to be foamed with a plurality of foam heads 30, dispensing the foam from the foam heads 30. The foam extinguishing agent contains at least active ingredients, a solvent and water, and contains neither fluorine, fluorine compounds, nor antifreeze. The active ingredients are hydrocarbon-based anionic surfactant and hydrocarbon-based ampholytic surfactant. The total concentration of the active ingredients ranges from 1 wt.% to 3.8 wt.%. The concentration of the solvent ranges from 1 wt.% to 5 wt.%. The output of the foam dispensed per 1 m2 floor area is less than 8.0 L / min.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a fixed foam fire extinguishing equipment suitable for a self-propelled parking lot where people always enter and exit, among the fire prevention objects specified in Article 17 of the Fire Protection Law.

Background Art

[0002] Fixed foam fire extinguishing equipment is often installed in self-propelled parking lots where people always enter and exit. The fixed foam fire extinguishing equipment mainly consists of a fire extinguishing water tank, a pressurized water supply device, a proportioner (mixer), a chemical storage container, and a plurality of foam heads. Fire extinguishing water is stored in the fire extinguishing water tank, and foam fire extinguishing chemicals are stored in the chemical storage container. When a fire breaks out in a self-propelled parking lot, first, the fire extinguishing water in the fire extinguishing water tank is pumped into the pipe by the pressurized water supply device. Next, the foam fire extinguishing chemical is mixed with the fire extinguishing water by the proportioner. Then, the aqueous solution in which the foam fire extinguishing chemical is mixed with the fire extinguishing water is supplied to the plurality of foam heads. The foam heads foam the aqueous solution and spray foam into the self-propelled parking lot. This foam covers the fire surface, and the fire is extinguished by the suffocation and cooling effects of the foam.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] <Regulation of PFOA> In the Cabinet Order (Cabinet Order No. 144 of 2021) amending a part of the Cabinet Order on the Enforcement of the Act on the Examination and Regulation of Chemical Substances and Manufacturing, etc., perfluorooctanoic acid (PFOA) was designated as a Class I Specified Chemical Substance and came into force on October 22, 2021. PFOA is an organic compound containing fluorine.

[0005] On the other hand, many fixed foam fire extinguishing systems in self-parking garages use aqueous film-forming foam fire extinguishing agents that contain fluorine-based surfactants as the active ingredient. This is because fluorine-based surfactants have the property of lowering surface tension, allowing them to form an aqueous film on the oil surface. However, in the future, aqueous film-forming foam fire extinguishing agents containing fluorine-based surfactants will no longer be usable in fixed foam fire extinguishing systems in self-parking garages.

[0006] <Changes to foam fire extinguishing agents> In addition to aqueous film-forming foam fire extinguishing agents, foam fire extinguishing agents include protein foam fire extinguishing agents and synthetic surfactant foam fire extinguishing agents. For fixed foam fire extinguishing systems in self-propelled parking lots, it is conceivable to use protein foam fire extinguishing agents or synthetic surfactant foam fire extinguishing agents that do not contain fluorine-based surfactants.

[0007] However, fixed foam fire extinguishing systems vary depending on the type of foam fire extinguishing agent used, and the floor area per square meter is also affected. 2 The amount of foam discharged per square meter is specified (Article 18, Paragraph 1, Item 2, Subparagraph c of the Fire Service Act Enforcement Regulations). Specifically, the amount of foam discharged from aqueous film-forming foam fire extinguishing agents is 3.7 L / min. The amount of foam discharged from protein foam fire extinguishing agents is 6.5 L / min. The amount of foam discharged from synthetic surfactant foam fire extinguishing agents is 8.0 L / min. In other words, aqueous film-forming foam fire extinguishing agents, protein foam fire extinguishing agents, and synthetic surfactant foam fire extinguishing agents have the highest fire extinguishing performance in this order. The aqueous film-forming foam fire extinguishing agent has the highest fire extinguishing performance, for a floor area of ​​1 m². 2 It has the lowest foam discharge per square meter. On the other hand, the synthetic surfactant foam fire extinguishing agent has the lowest fire extinguishing performance, with a floor area of ​​1 square meter. 2 This area has the highest amount of bubble emission.

[0008] Therefore, if protein-based foam extinguishing agents or synthetic surfactant-based foam extinguishing agents are used in a fixed foam fire extinguishing system designed for aqueous film-forming foam extinguishing agents, the required foam discharge rate (6.5 L / min or 8.0 L / min) for fire extinguishing cannot be obtained. In order to obtain the required foam discharge rate, it is necessary to modify the pressurized water supply system, piping, and other components of the fixed foam fire extinguishing system.

[0009] <Purpose of the Invention> This invention has been made in view of the above problems, and improves the fire extinguishing performance of synthetic surfactant foam fire extinguishing agents that do not contain fluorine-based surfactants, for a floor area of ​​1 m². 2 The objective is to provide a fixed foam fire extinguishing system that can achieve sufficient fire extinguishing performance even when the foam discharge rate per unit is less than 8.0 L / min. [Means for solving the problem]

[0010] (1) To achieve the above objective, the present invention provides a fixed foam fire extinguishing system that foams an aqueous solution, which is a mixture of fire extinguishing water and a foam fire extinguishing agent, using a plurality of foam heads, and discharges foam from the foam heads, wherein the foam fire extinguishing agent contains at least an active ingredient, a solvent, and water, and does not contain fluorine, fluorine compounds, or antifreeze, the active ingredient is a hydrocarbon anionic surfactant and a hydrocarbon amphoteric surfactant, the total concentration of the active ingredient is in the range of 1% to 3.8% by weight, the concentration of the solvent is in the range of 1% to 5% by weight, and the floor area is 1 m 2 The device is configured such that the amount of foam discharged per unit is less than 8.0 L / min.

[0011] (2) Preferably, in the fixed fire extinguishing equipment of (1) above, the hydrocarbon anionic surfactant is an alpha-olefin sulfonate, and the hydrocarbon amphoteric surfactant is lauryldimethylaminoacetic acid.

[0012] (3) Preferably, in the fixed fire extinguishing equipment of (1) or (2) above, the solvent is a carbitol.

[0013] (4) Preferably, in the fixed fire extinguishing equipment of (3) above, the solvent is diethylene glycol monobutyl ether.

[0014] (5) Preferably, in any of the fixed fire extinguishing equipment described in (1) to (4) above, the biochemical oxygen demand of the foam fire extinguishing agent is 100 mg / L to 600 mg / L.

[0015] (6) Preferably, in the fixed fire extinguishing equipment according to any one of (1) to (5) above, the foam head includes a head body, a wire mesh, a rod, and a deflector. The head body has a cylindrical flow path provided on the upper surface of a disc with a diameter of 50 mm or more. An outlet communicating with the inside of the flow path is provided at the center of the disc, and at least one air hole is provided on the plate surface of the disc. The upper end of the rod is fixed to the upper end of the flow path of the head body, and the plate-shaped deflector is fixed to the lower end of the rod. By fixing the bowl-shaped wire mesh to the lower surface of the head body, the deflector is covered with the wire mesh.

[0016] (7) Preferably, in the fixed fire extinguishing equipment according to (6) above, the radiation amount of one of the foam heads is within the range of 35 L / min to 54 L / min at a radiation pressure of 0.25 MPa.

Advantages of the Invention

[0017] By using hydrocarbon-based anionic surfactants and hydrocarbon-based amphoteric surfactants as the active ingredients of the foam fire extinguishing agent used in the fixed fire extinguishing equipment of the present invention, it is possible to improve the fire extinguishing performance of the foam fire extinguishing agent without containing any fluorine, fluorine compounds, and antifreeze agents. Further, by adding carbitols as a solvent, the fire extinguishing performance of the foam fire extinguishing agent is further improved. In particular, when the solvent is diethylene glycol monobutyl ether, the low-temperature stability when storing the foam fire extinguishing agent is improved.

[0018] Therefore, by using the foam fire extinguishing agent of the present invention in a fixed foam fire extinguishing equipment designed on the premise of using an aqueous film-forming foam fire extinguishing agent or a protein foam fire extinguishing agent, even if the radiation amount of foam per square meter of floor area is less than 8.0 L / min, sufficient fire extinguishing performance can be obtained. 2

Brief Description of the Drawings

[0019] [Figure 1] FIG. 1 is a block diagram showing a fixed foam fire extinguishing equipment according to an embodiment of the present invention. [Figure 2] FIG. 2(a) is a partial cross-sectional view of the foam head, and FIG. 2(b) is a plan view of the foam head. [Figure 3] FIG. 3 is a flowchart showing the operation of the fixed foam fire extinguishing equipment.

Embodiments for Carrying Out the Invention

[0020] Hereinafter, the fixed foam fire extinguishing equipment according to the embodiments of the present invention will be described with reference to the drawings.

[0021] 1. Fixed foam fire extinguishing equipment 1.1 Overview FIG. 1 shows the fixed foam fire extinguishing device 1 of the present embodiment. The fixed foam fire extinguishing device 1 mainly includes a fire extinguishing water tank 11, a pressurized water supply device 12, a chemical storage container 13, a proportioner 14, a flowing water detection device 15, a simultaneous opening valve 16, an automatic starting device 21, a manual starting device 22, and a plurality of foam heads 30.

[0022] Fire extinguishing water is stored in the fire extinguishing water tank 11. Foam fire extinguishing chemicals are stored in the chemical storage container 13. The automatic starting device 21, the manual starting device 22, and the plurality of foam heads 30 are installed, for example, in the parking spaces of a self-propelled parking lot. The fixed foam fire extinguishing device 1 foams an aqueous solution in which fire extinguishing water and foam fire extinguishing chemicals are mixed with a plurality of foam heads 30, and emits foam from the foam heads 30. A fire occurring in the parking space of a self-propelled parking lot is extinguished by the foam emitted from the foam heads 30.

[0023] Here, the thick solid line in FIG. 1 indicates the first pipe 41 with a large diameter. The thin solid lines in FIG. 1 indicate the second pipe 42 and the third pipe 43 with a small diameter. The chain line in FIG. 1 indicates the signal transmission path. The fixed foam fire extinguishing device 1 is designed on the premise of using, for example, aqueous film-forming foam fire extinguishing chemicals. For example, the outer diameter of the first pipe 41 is 60.5 mm (50A in A designation). Also, the outer diameters of the second pipe 42 and the third pipe 43 are 42.7 mm (32A in A designation). Furthermore, the floor area of the fixed foam fire extinguishing device 1 is 1 m 2The foam discharge rate per unit is 3.7 L / min. This discharge rate is determined by the pump performance of the pressurized water supply device 12, the inner diameter and length of the first and second pipes 41 and 42, the number, arrangement and discharge rate of the foam heads 30, etc.

[0024] 1.2 Components In Figure 1, the firefighting water stored in the fire water tank 11 is drawn up by the pressurized water supply device 12 and supplied to the first pipe 41, the second pipe 42, and the third pipe 43. The pressurized water supply device 12 is a fire pump and is controlled by the pump control panel 12A. The pump inside the pressurized water supply device 12 is always filled with water supplied from the priming tank 12B.

[0025] The proportioner 14 is operated by the flow of firefighting water supplied from the pressurized water supply device 12. The proportioner 14 draws up an amount of foam fire extinguishing agent corresponding to the flow rate of the fire extinguishing water from the agent storage container 13 and mixes it with the fire extinguishing water. This generates an aqueous solution of a concentration suitable for use with the foam fire extinguishing agent.

[0026] The water flow detection device 15 detects the water flow in the first pipe 41 caused by the opening of the simultaneous release valve 16 and outputs a signal. Meanwhile, the simultaneous release valve 16 opens its built-in valve in response to the operation of the automatic activation device 21 or the manual activation device 22. As a result, the water in the first pipe 41 flows from the primary side to the secondary side of the simultaneous release valve 16.

[0027] The automatic activation device 21 of this embodiment is, for example, a sensing head that is activated by the heat generated when a fire occurs. The sensing head includes a fusible piece that melts when heated and a valve that opens when the fusible piece melts. In addition, the third pipe 43 connecting the automatic activation device (sensing head) 21 and the simultaneous release valve 16 in Figure 1 is always filled with water. When a fire occurs, the fusible piece melts due to the heat, and the valve in the sensing head opens. As a result, the water in the third pipe 43 is discharged from the sensing head. This pressurizes or depressurizes a valve built into the simultaneous release valve 16, causing this valve to open.

[0028] The automatic activation device 21 may be, for example, a detector equipped with a sensor. The detector is electrically connected to the simultaneous opening valve 16 by a signal transmission line, rather than by the third piping 43 shown in Figure 1. The detector detects smoke, heat, or flames when a fire occurs and outputs a signal. This signal is input to the simultaneous opening valve 16 via the transmission line. The simultaneous opening valve 16 opens its built-in valve based on the signal output from the detector.

[0029] The manual starting device 22 in this embodiment is, for example, a manual starting valve. Also, the third pipe 43 connecting the manual starting device (manual starting valve) 22 and the simultaneous opening valve 16 in Figure 1 is always filled with water. For example, when the manual starting valve is opened by human operation, water necessary to operate the valve built into the simultaneous opening valve 16 is supplied to or discharged from the simultaneous opening valve 16. As a result, the valve built into the simultaneous opening valve 16 is opened.

[0030] The manual activation device 22 may be, for example, an emergency button that can be pressed by a person. The emergency button is electrically connected to the simultaneous opening valve 16 by a signal transmission line, rather than by the third piping 43 shown in Figure 1. When the emergency button is pressed by a person, it outputs a signal. This signal is input to the simultaneous opening valve 16 via the transmission line. The simultaneous opening valve 16 opens its built-in valve based on the signal output from the sensor.

[0031] The disaster prevention monitoring panel 50 is installed, for example, in the disaster prevention center or central control room of a building equipped with a self-propelled parking garage. The disaster prevention monitoring panel 50 is electrically connected to the pump control panel 12A, the water flow detection device 15, and the air compressor 17 via a transmission line. Based on the signal output by the water flow detection device 15, the disaster prevention monitoring panel 50 notifies the building and the fire department of the occurrence of a fire.

[0032] The disaster prevention monitoring panel 50 of this embodiment includes a control panel 51 for controlling the fixed foam fire extinguishing system 1. Based on the signal output from the water flow detection device 15, the control panel 51 outputs a signal to the pump control panel 12A, which activates the pressurized water supply device 12. As a result, fire extinguishing water is supplied to the proportioner 14, and an aqueous solution mixed with an appropriate amount of foam fire extinguishing agent is generated. This aqueous solution flows from the primary side to the secondary side of the simultaneous release valve 16 and is supplied to a plurality of foam heads 30 via the second piping 42. The foam heads 30 foam the aqueous solution and discharge foam onto the parking spaces of the self-propelled parking lot.

[0033] 1.3 Foam Head Figures 2(a) and 2(b) show the configuration of the foam head 30. In Figure 2(a), the foam head 30 consists of a head body 31, a support part 32, a rod 33, a deflector 34, a swirling flow vortex 35, a wire mesh 36, and a screw 37.

[0034] As shown in Figures 2(a) and (b), the head body 31 has a configuration in which a cylindrical channel 31b is provided on the upper surface of a disc 31a with a diameter of 50 mm or more. An outlet 31c leading into the channel 31b is provided in the center of the disc 31a. Six air holes 31d are provided on the surface of the disc 31a at 60° intervals.

[0035] A support portion 32 is provided at the upper end of the flow path 31b of the head body 31. The support portion 32 comprises support columns extending in three directions at 120° intervals and a female threaded portion provided at the center of the support columns. A male thread provided at the upper end of the rod 33 is screwed into the female threaded portion of the support portion 32. The rod 33 extends from the upper end of the flow path 31b through the outlet 31c and below the disc 31a. A plate-shaped deflector 34 is fixed to the lower end of the rod 33. The deflector 34 is covered by the wire mesh 36 by fixing a bowl-shaped wire mesh 36 to the lower surface of the head body 31. Both the deflector 34 and the wire mesh 36 are fastened to the lower end of the rod 33 by screws 37. As shown in Figure 2(a), a swirling flow choke 35 is attached to the upper end of the rod 33.

[0036] The flow path 31b of the head body 31a is connected to the outlet of the second pipe 42 shown in Figure 1. The aqueous solution supplied from the second pipe 42 into the flow path 31b is swirled by the swirling flow vortex 35. The aqueous solution swirls along the inner wall surface of the flow path 31b and is guided to the outlet 31c in the center of the disc 31a. The aqueous solution that flows out from the outlet 31c is foamed by colliding with the deflector 34, while drawing in air flowing in from the six air holes 31d. The foam foamed by the deflector 34 is dispersed by the wire mesh 36 and radiated into a circular area centered on the foam head 30.

[0037] For example, if the foam head 30 shown in Figure 2 is installed at a height of 8 m from the floor and foam is discharged at a discharge pressure of 0.25 MPa at a rate of 35 L / min to 54 L / min, the foam discharge range of the foam head 30 will be a circle with a diameter of approximately 5 m.

[0038] 1.4 Operation Flow of Fixed Foam Fire Extinguishing System Next, the operation flow of the fixed foam fire extinguishing system 1 will be explained with reference to steps S1 to S7 in Figure 3.

[0039] In step S1, the fixed foam fire extinguishing system 1 begins its operation for fire extinguishing when the automatic activation device 21 or the manual activation device 22 is activated ("YES" in step S1). In a parking space of a self-propelled parking garage, for example, the sensing head, which is the automatic activation device 21, is activated by the heat of the fire, and water in the third pipe 43 is discharged from the sensing head. Alternatively, for example, a person who discovers a fire can open the manual activation valve, which is the manual activation device 22, and water in the third pipe 43 is discharged from the manual activation valve.

[0040] In step S2, when water is discharged from the third pipe 43 to which the automatic starter 21 or manual starter 22 is connected, a valve built into the simultaneous release valve 16 is pressurized or depressurized, and this valve is opened. As a result, the water in the first pipe 41 flows from the primary side to the secondary side of the simultaneous release valve 16.

[0041] In step S3, the water flow detection device 15 detects the water flow in the first pipe 41 and outputs a signal. This signal is input to the disaster prevention monitoring panel 50.

[0042] In step S4, the fire prevention monitoring panel 50 notifies the building and the fire department of the occurrence of a fire based on the signal output from the water flow detection device 15. The control panel 51 of the fire prevention monitoring panel 50 also outputs a signal to the pump control panel 12A of the pressurized water supply device 12.

[0043] In step S5, the pump control panel 12A activates the pressurized water supply device 12 based on the signal output from the control panel 51 of the disaster prevention monitoring panel 50. As a result, the fire extinguishing water stored in the fire extinguishing water tank 11 is supplied to the proportioner 14 through the first pipe 41.

[0044] In step S6, the proportioner 14 draws up an amount of foam fire extinguishing agent corresponding to the flow rate of the fire extinguishing water from the agent storage container 13 and mixes it with the fire extinguishing water. This generates an aqueous solution of a concentration suitable for use with the foam fire extinguishing agent. This aqueous solution flows from the primary side to the secondary side of the simultaneous release valve 16 and is supplied to the multiple foam heads 30 via the second piping 42.

[0045] In step S7, multiple foam heads 30 generate foam by foaming the aqueous solution supplied from the second pipe 42, covering a floor area of ​​1 m². 2 It emits bubbles at a rate of 3.7 L / min per unit.

[0046] 2. Foam fire extinguishing agent The foam fire extinguishing agent used in the fixed foam fire extinguishing system 1 of this embodiment contains at least an active ingredient, a solvent, and water, and does not contain fluorine, fluorine compounds, or antifreeze. The active ingredient is a hydrocarbon anionic surfactant and a hydrocarbon amphoteric surfactant. The total concentration of the active ingredient is in the range of 1% to 3.8% by weight. On the other hand, the concentration of the solvent is in the range of 1% to 5% by weight.

[0047] As the active ingredient, a hydrocarbon-based anionic surfactant is preferably alpha-olefin sulfonate. Alpha-olefin sulfonate includes sodium alpha-olefin sulfonate. As the active ingredient, a hydrocarbon-based amphoteric surfactant is preferably lauryldimethylaminoacetic acid. Lauryldimethylaminoacetic acid includes lauryldimethylaminoacetic acid betaine. Carbitols are preferred as the solvent, and diethylene glycol monobutyl ether is more preferred.

[0048] 2.1 Examples The following describes examples of foam fire extinguishing agents used in fixed-type foam fire extinguishing systems 1.

[0049] 2.1.1 Ingredients Table 1 below shows the components of Example 1 and Comparative Example 1 of the foam fire extinguishing agent. Example 1 is a synthetic surfactant foam fire extinguishing agent, containing a hydrocarbon surfactant, solvent, and water. Comparative Example 1, on the other hand, is a water-based film-forming foam fire extinguishing agent sold by the applicant, product name "Surfwater III" (certification model number: Foam No. 10-6). Comparative Example 1 contains a fluorine-based surfactant, solvent, antifreeze, and water.

[0050] [Table 1]

[0051] Furthermore, the detailed components of Example 1 in Table 1 are shown in Table 2 below.

[0052] [Table 2]

[0053] In Table 2, Example 1 contains a hydrocarbon-based anionic surfactant and a hydrocarbon-based amphoteric surfactant. As the hydrocarbon-based anionic surfactant, 2.9% by weight of sodium alpha olefin sulfonate (product name "Lipolan LB-440" sold by Lion Specialty Chemicals Co., Ltd.) was used. On the other hand, as the hydrocarbon-based amphoteric surfactant, 0.3% by weight of lauryldimethylaminoacetic acid betaine (product name "Anhitol 20BS" sold by Kao Corporation) was used. The remaining component of Example 1 is 96.8% by weight of water.

[0054] 2.1.2 Comparison of Fire Extinguishing Time and Foam Expansion Ratio Using the fixed foam fire extinguishing equipment 1 shown in Fig. 1 and the foam head 30 shown in Fig. 2, the fire extinguishing time and foam expansion ratio of Example 1 and Comparative Example 1 were compared. The comparison results are shown in Table 3 below.

[0055]

Table 3

[0056] Here, the foam emission rate in Table 3 is 3.7 L / min per 1 m 2 of floor area. This emission rate is defined for the aqueous film-forming foam fire extinguishing agent with high fire extinguishing performance. Generally, for the synthetic surfactant foam fire extinguishing agent with lower fire extinguishing performance than the aqueous film-forming foam fire extinguishing agent, a foam emission rate of 8.0 L / min per 1 m 2 of floor area is defined (Article 18, Paragraph 1, Item 2, Sub-item (c) of the Enforcement Regulations of the Fire Service Act).

[0057] As shown in Table 3, under the condition that the foam emission rate per 1 m 2 of floor area is 3.7 L / min, the fire extinguishing time of Example 1, which is a synthetic surfactant foam fire extinguishing agent, was 69 seconds. On the other hand, the fire extinguishing time of Comparative Example 1, which is an aqueous film-forming foam fire extinguishing agent, was 50 seconds. The difference in fire extinguishing time between Example 1 and Comparative Example 1 was only 19 seconds, and the fire extinguishing time results in Table 3 mean that Example 1, which is a synthetic surfactant foam fire extinguishing agent, has the same fire extinguishing performance as Comparative Example 1, which is an aqueous film-forming foam fire extinguishing agent.

[0058] Furthermore, as shown in Table 3, floor area 1 m 2 Under conditions where the foam discharge rate per unit area was 3.7 L / min, the foaming ratio of Example 1, a synthetic surfactant foam fire extinguishing agent, was 6.26. On the other hand, the foaming ratio of Comparative Example 1, an aqueous film-forming foam fire extinguishing agent, was 7.47. The difference in foaming ratio between Example 1 and Comparative Example 1 was only 1.21, and the foaming ratio results in Table 3 indicate that Example 1, a synthetic surfactant foam fire extinguishing agent, has a foaming ratio equivalent to that of Comparative Example 1, an aqueous film-forming foam fire extinguishing agent.

[0059] 2.1.3 Biological Oxygen Demand (BOD) In synthetic surfactant foam fire extinguishing agents, the content of hydrocarbon surfactants significantly affects the biochemical oxygen demand (BOD). As shown in Table 4 below, the total amount of synthetic surfactant foam fire extinguishing agents in Examples 2-6 was 2.6% to 3.8% by weight, and the biochemical oxygen demand was 310 mg / L to 430 mg / L. On the other hand, the total amount of synthetic surfactant foam fire extinguishing agent in Comparative Example 2 was 4.0% by weight, and the biochemical oxygen demand was 1360 mg / L. The results for biochemical oxygen demand in Table 4 show that the biochemical oxygen demand increases significantly as the total amount of synthetic surfactant foam fire extinguishing agents exceeds 3.8% by weight. The inventors have found that by keeping the total amount of hydrocarbon anionic surfactants and hydrocarbon amphoteric surfactants within the range of 1% to 3.8% by weight, it is possible to suppress the biochemical oxygen demand of synthetic surfactant foam fire extinguishing agents to 100 mg / L to 600 mg / L.

[0060] [Table 4]

[0061] 3. Effects By using hydrocarbon-based anionic surfactants and hydrocarbon-based amphoteric surfactants as the active ingredients of the foam fire extinguishing agent used in fixed fire extinguishing equipment 1, the fire extinguishing performance of the foam fire extinguishing agent can be improved without containing fluorine, fluorine compounds, or antifreeze. Furthermore, the fire extinguishing performance of the foam fire extinguishing agent can be further improved by adding carbitols as a solvent. In particular, when diethylene glycol monobutyl ether is used as the solvent, the low-temperature stability of the foam fire extinguishing agent when stored is improved.

[0062] Therefore, by applying the foam fire extinguishing agent and foam head 30 of this embodiment to a fixed foam fire extinguishing system designed on the premise of using aqueous film-forming foam fire extinguishing agent or protein foam fire extinguishing agent, a floor area of ​​1 m² is achieved. 2 Even if the foam discharge rate per unit area is less than 8.0 L / min, sufficient fire extinguishing performance can be obtained. In particular, by applying the foam fire extinguishing agent and foam head 30 of this embodiment, a floor area of ​​1 m² can be achieved. 2 Sufficient fire extinguishing performance can be obtained even if the foam discharge rate per unit area is less than 6.0 L / min, or even less than 4.0 L / min.

[0063] For example, in a fixed foam fire extinguishing system designed on the premise of using aqueous film-forming foam fire extinguishing agents or protein foam fire extinguishing agents containing fluorine-based surfactants as active ingredients, even if it becomes impossible to use these aqueous film-forming foam fire extinguishing agents or protein foam fire extinguishing agents, the existing fixed foam fire extinguishing system can be used as is by applying the foam fire extinguishing agent and foam head 30 of this embodiment. In this way, since the foam fire extinguishing agent of this embodiment can be applied to existing fixed foam fire extinguishing systems without replacing piping, pressurized water supply equipment, etc., it is possible to address PFOA regulations very easily, quickly, and inexpensively.

[0064] The foam fire extinguishing agent of this embodiment can suppress the biochemical oxygen demand to 100 mg / L to 600 mg / L. As a result, even when the foam of the foam fire extinguishing agent of this embodiment is discharged from the foam head 30 onto the parking space, the foam can be flushed directly into the sewer, eliminating the need for foam recovery or special treatment. Therefore, it is possible to quickly resume operation of the self-propelled parking lot after test operation of the fixed foam fire extinguishing system or after actual fire extinguishing. [Explanation of Symbols]

[0065] 1 Fixed foam fire extinguishing equipment 11. Firefighting water tank 12 Pressurized water supply device 12A Pump Control Panel 12B Priming tank 13. Drug storage containers 14 Proportioners 15. Water flow detection device 16 Simultaneous opening valve 17 Air Compressor 21 Automatic start device 22 Manual activation device 30 Foam Head 31 Head body 31a Disk 31b Channel 31c exit 31d Air vent 32 Support part 33 Rods 34 Deflector 35 Swirling Flow Top 36 Wire mesh 37 screws 41. First Piping 42. Second Piping 43 Third Piping 50 Disaster prevention monitoring board 51 Control Panel

Claims

1. A fixed foam fire extinguishing system that foams an aqueous solution obtained by mixing fire extinguishing water and a foam fire extinguishing agent with a plurality of foam heads and sprays foam from the foam heads, The foam fire extinguishing agent contains at least an active ingredient, a solvent, and water, and does not contain any of fluorine, a fluorine compound, or an antifreeze agent; the active ingredients are a hydrocarbon-based anionic surfactant and a hydrocarbon-based amphoteric surfactant, the total concentration of the active ingredients is within the range of 1% by weight to 3.8% by weight, and the concentration of the solvent is within the range of 1% by weight to 5% by weight; Floor area 1m ２ A fixed foam fire extinguishing system configured so that the amount of foam emitted per unit area is less than 8.0 L / min.

2. 2. The fixed foam fire extinguishing system according to claim 1, wherein the hydrocarbon-based anionic surfactant is an alpha-olefin sulfonate, and the hydrocarbon-based amphoteric surfactant is lauryl dimethyl amino acetic acid.

3. The fixed foam fire extinguishing system according to claim 1, wherein the solvent is a carbitol.

4. The fixed foam fire extinguishing system according to claim 3, wherein the solvent is diethylene glycol monobutyl ether.

5. 2. The fixed foam fire extinguishing system according to claim 1, wherein the biochemical oxygen demand of the foam fire extinguishing agent is 100 mg / L to 600 mg / L.

6. the foam head comprises a head body, a wire mesh, a rod, and a deflector; The head body is configured such that a cylindrical flow path is provided on the upper surface of a circular plate having a diameter of 50 mm or more, an outlet leading to the flow path is provided in the center of the circular plate, and at least one air hole is provided on the plate surface of the circular plate, an upper end of the rod is fixed to an upper end of the flow path of the head body; The plate-shaped deflector is fixed to the lower end of the rod, A fixed foam fire extinguishing system according to any one of claims 1 to 5, wherein the deflector is covered by the wire mesh by fixing the bowl-shaped wire mesh to the underside of the head body.

7. A fixed foam fire extinguishing system as described in claim 6, wherein the amount of foam emitted from one foam head is within the range of 35 L / min to 54 L / min at a spray pressure of 0.25 MPa.

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