CN115300847A

CN115300847A - Fire extinguishing device

Info

Publication number: CN115300847A
Application number: CN202210812408.3A
Authority: CN
Inventors: 李旺春; 章梦灿; 杨胡飞; 揭劲峰
Original assignee: Hubei Jiandun Fire Technology Co Ltd
Current assignee: Hubei Jiandun Fire Technology Co Ltd
Priority date: 2022-07-12
Filing date: 2022-07-12
Publication date: 2022-11-08
Anticipated expiration: 2042-07-12
Also published as: CN115300847B; WO2024012013A1

Abstract

The application relates to a fire extinguishing apparatus, comprising: the fire extinguishing container is provided with an accommodating cavity and a nozzle communicated with the accommodating cavity and the outside; the first fire extinguishing agent and the second fire extinguishing agent are contained in the containing cavity and controlled to respectively generate a first fire extinguishing medium and a second fire extinguishing medium, and the first fire extinguishing medium and the second fire extinguishing medium are sprayed out of the outside air through the nozzles; wherein the density of the first extinguishing medium is less than the density of air and the density of the second extinguishing medium is greater than or equal to the density of air. After the fire extinguishing device is started in an overlarge or narrow and high protection space, the first fire extinguishing medium can move towards the upper area of the protection space and extinguish the upper flame, and the second fire extinguishing medium can permeate the lower area of the protection space and extinguish the lower flame. In this way, the first extinguishing medium and the second extinguishing medium penetrate the upper and lower areas of the protected space, respectively, so that flames in an excessively large or narrow and tall protected space can be completely extinguished.

Description

Fire extinguishing device

Technical Field

The application relates to the technical field of fire extinguishing, in particular to a fire extinguishing device.

Background

The perfluorohexanone is used as a fire extinguishing agent, has high fire extinguishing efficiency, and is widely applied to the market of fire extinguishing devices. Most of the perfluorohexanone fire extinguishing apparatuses on the market adopt a pressure storage type fire extinguishing apparatus, that is, when the apparatus is started, the perfluorohexanone is pushed out of the apparatus by inert gas such as nitrogen gas, thereby extinguishing fire.

However, the device having such a structure has a large safety risk because the pressure is constantly applied even in a non-use state.

Disclosure of Invention

Therefore, it is necessary to provide a fire extinguishing apparatus with high safety against the problem that the conventional perfluorohexanone fire extinguishing apparatus always has pressure even in a non-use state, and thus has a great potential safety hazard.

According to one aspect of the present application, there is provided a fire suppression apparatus comprising:

the fire extinguishing container is provided with an accommodating cavity and a nozzle communicated with the accommodating cavity and the outside; and

the first fire extinguishing agent and the second fire extinguishing agent are contained in the containing cavity and controlled to respectively generate a first fire extinguishing medium and a second fire extinguishing medium, and the first fire extinguishing medium and the second fire extinguishing medium are sprayed out of the nozzle to the outside air;

wherein the density of the first extinguishing medium is less than the density of air and the density of the second extinguishing medium is greater than or equal to the density of air.

In one embodiment, the first fire-extinguishing agent is liquid perfluorohexanone, the second fire-extinguishing agent is an aerosol generating agent, and the liquid perfluorohexanone is in thermally conductive connection with the aerosol generating agent;

the aerosol generating agent is controlled to burn to generate an aerosol fire extinguishing medium and release heat at the same time, the liquid perfluorohexanone is heated to be vaporized to form gaseous perfluorohexanone, and the aerosol fire extinguishing medium and the gaseous perfluorohexanone are sprayed out of the nozzle to the outside air.

In one embodiment, the fire extinguishing device further comprises a heat conducting piece, the heat conducting piece is arranged in the containing cavity and divides the containing cavity into a first containing cavity and a second containing cavity, and the first containing cavity and the second containing cavity are both communicated with the outside through the nozzles; the liquid perfluorohexanone is contained in the first containing cavity, and the aerosol generating agent is contained in the second containing cavity;

wherein the heat released by the aerosol generating agent can be transferred to the liquid perfluorohexanone by the heat conducting member.

In one embodiment, the heat conductive member includes:

the partition part is arranged in the accommodating cavity and divides the accommodating cavity into the first accommodating cavity and the second accommodating cavity; and

the heat conduction pipe penetrates through the first accommodating cavity and is communicated with the second accommodating cavity and the first accommodating cavity, and the aerosol fire extinguishing medium enters the first accommodating cavity through the heat conduction pipe and is sprayed out through the nozzle.

In one embodiment, the liquid perfluorohexanone is disposed proximate to the heat pipe.

In one embodiment, the liquid perfluorohexanone is disposed around the heat pipe.

In one embodiment, the number of the heat conductive pipes is at least two.

In one embodiment, the fire extinguishing device further comprises an activation device connected to the aerosol fire extinguishing medium for responding to a fire and igniting the aerosol generating agent.

In one embodiment, the activation device includes a heat-sensitive wire and/or an electronic ignition head.

In one embodiment, the number of jets is at least two.

When the fire extinguishing device is in a use state, namely when fire occurs, the second fire extinguishing agent is controlled to burn to generate a second fire extinguishing medium, heat released by burning is conducted to the first fire extinguishing agent through the heat conducting piece, the first fire extinguishing agent is heated to generate a first fire extinguishing medium, and the second fire extinguishing medium and the first fire extinguishing medium are discharged to a protection space through the nozzle under the action of pressure to extinguish fire; when the fire extinguishing device is not in use, namely when fire does not occur, the second fire extinguishing agent cannot be combusted, and the first fire extinguishing agent cannot be started under the condition that the first fire extinguishing agent is not in contact with heat. Thus, the fire extinguishing apparatus generates high pressure only in the use state, and does not generate high pressure in the non-use state, thereby effectively improving the safety of the fire extinguishing apparatus.

Drawings

Fig. 1 is a schematic structural diagram of a fire extinguishing apparatus according to an embodiment of the present application.

100. A fire extinguishing device; 10. a fire extinguishing container; 11. an accommodating chamber; 111. a first accommodating chamber; 112. a second accommodating cavity; 12. a spout; 21. a first fire extinguishing agent; 22. a second fire extinguishing agent; 30. a heat conductive member; 31. a partition portion; 32. a heat conduction pipe; 40. and starting the device.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiment in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and therefore the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The fire extinguishing apparatus of the present application will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a fire extinguishing apparatus according to an embodiment of the present application. For the purpose of illustration, only the structures described in connection with the present application are illustrated in the figures.

Referring to fig. 1, a fire extinguishing apparatus 100 disclosed in at least one embodiment of the present application includes a fire extinguishing container 10, a heat conducting member 30, a first fire extinguishing agent 21 and a second fire extinguishing agent 22, wherein the fire extinguishing container 10 is used for accommodating the heat conducting member 30, the first fire extinguishing agent 21 and the second fire extinguishing agent 22, and the first fire extinguishing agent 21 and the second fire extinguishing agent 22 are used for generating a fire extinguishing medium for extinguishing flames in a protection space.

The fire extinguishing container 10 has a cylindrical shape, but may have other shapes, such as a conical shape, a rectangular parallelepiped shape, and the like, and the present application is not limited thereto. The fire extinguishing container 10 has one and holds chamber 11 and intercommunication and hold chamber 11 and external spout 12, and first fire extinguishing agent 21 and second fire extinguishing agent 22 hold in holding chamber 11, and the fire extinguishing medium of production is spouted by spout 12 in the air of protection space. The number of the nozzles 12 may be at least two, for example six, and six nozzles 12 are uniformly spaced. Therefore, the spraying uniformity of the fire extinguishing medium can be improved, and the fire extinguishing efficiency and the fire extinguishing effect are improved. Further, the six nozzles 12 can be divided into a first nozzle 12 and a second nozzle 12, the first nozzle 12 is dedicated for spraying the fire extinguishing medium generated by the first fire extinguishing agent 21, and the second nozzle 12 is dedicated for spraying the fire extinguishing medium generated by the second fire extinguishing agent 22. It is to be understood that the above description is intended to be illustrative only and is not intended to be limiting.

Heat-conducting member 30 is located and is held in the chamber 11 and will hold chamber 11 and separate for the first chamber 111 and the second chamber 112 that holds, and the first chamber 111 and the second chamber 112 that holds all communicate with the external world through spout 12 of holding. The first fire extinguishing agent 21 is contained in the first containing chamber 111, and the second fire extinguishing agent 22 is contained in the second containing chamber 112. The second fire extinguishing agent 22 is controlled to burn to generate a second fire extinguishing medium, the heat generated by burning can be conducted to the first fire extinguishing agent 21 by the heat conducting member 30, and the first fire extinguishing agent 21 is heated to generate a first fire extinguishing medium.

In practical use, when the fire extinguishing apparatus 100 is in use, that is, when a fire occurs, the second fire extinguishing agent 22 is controlled to burn to generate the second fire extinguishing medium, the heat released by burning is conducted to the first fire extinguishing agent 21 through the heat conducting member 30, the first fire extinguishing agent 21 is heated to generate the first fire extinguishing medium, and the second fire extinguishing medium and the first fire extinguishing medium are discharged to a protected space through the nozzle 12 under pressure to extinguish the fire; in the non-use state, i.e., when no fire is occurring, the second fire extinguishing agent 22 does not burn, and the first fire extinguishing agent 21 is also not activated without contact with heat. Thus, the fire extinguishing apparatus 100 generates high pressure only in the use state and does not generate high pressure in the non-use state, thereby effectively improving the safety of the fire extinguishing apparatus 100.

In order to avoid the mutual influence of the first fire extinguishing agent 21 and the second fire extinguishing agent 22, the heat conduction member 30 should match the size of the accommodating chamber 11, and can divide the accommodating chamber 11 into the first accommodating chamber 111 and the second accommodating chamber 112 independent of each other after being erected in the accommodating chamber 11. The heat conduction member 30 may be a metal heat conduction member 30, such as a metal heat conduction member 30 made of a metal heat conduction material, such as iron, copper, etc., so as to ensure the heat conduction effect.

In some embodiments, the thermally conductive member 30 includes a partition 31 and a heat conductive pipe 32. The partition portion 31 is provided in the accommodation chamber 11, and partitions the accommodation chamber 11 into a first accommodation chamber 111 and a second accommodation chamber 112. Specifically, the partition portion 31 has a plate shape, and is disposed transversely in the accommodating chamber 11 to define a first accommodating chamber 111 and a second accommodating chamber 112. The heat pipe 32 is coupled to the partition 31 and communicates with the second accommodating chamber 112 and the nozzle 12, and the second fire extinguishing medium is transported from the second accommodating chamber 112 to the nozzle 12 through the heat pipe 32 and sprayed out. Specifically, one end of the heat conductive pipe 32 is formed on the partition 31 and is communicated with the second accommodating chamber 112, and the other end may be located in the first accommodating chamber 111, or may be formed on a chamber wall of the first accommodating chamber 111, that is, the nozzle 12 itself.

In actual use, the second fire extinguishing medium generated by burning the second fire extinguishing agent 22 in the second containing chamber 112 is transported to the other end through the one end of the heat conducting pipe 32 on the partition 31, and then is sprayed out from the nozzle 12 and enters into the protection space to extinguish fire. In addition, the second fire extinguishing medium carries heat generated by burning the second fire extinguishing agent 22 during the transportation in the heat conducting pipe 32, and a part of the heat can be transferred to the first fire extinguishing agent 21 through the pipe wall of the heat conducting pipe 32 and the air in the first accommodating chamber 111. Therefore, heat can be transferred to the first fire extinguishing agent 21 through the heat conductive pipes 32 except the partition 31, increasing the heat transfer path and the heat transfer area, thereby accelerating the heat transfer and thus accelerating the generation of the first fire extinguishing medium by the first fire extinguishing agent 21.

The heat pipe 32 may be in direct contact or indirect contact with the first fire-extinguishing agent 21, and in the embodiment of the present application, at least a portion of the heat pipe 32 extends into the first fire-extinguishing agent 21 to be in direct contact with the first fire-extinguishing agent 21. In practical use, the heat carried in the heat conduction pipes 32 can be directly transferred to the first extinguishing agent 21 through the walls of the heat conduction pipes 32. Thus, the heat transfer speed to the first fire extinguishing agent 21 can be increased, and the heat transfer to the first fire extinguishing agent 21 is increased, so that the first fire extinguishing agent 21 is accelerated to generate the first fire extinguishing medium.

To further enhance the heat conduction effect, the number of the heat conduction pipes 32 is at least two, and the heat conduction pipes are arranged at intervals. In some embodiments, the number of the heat pipes 32 is six, the six heat pipes 32 are uniformly arranged in the first accommodating chamber 111 at intervals, and the first fire extinguishing medium is disposed around the six heat pipes 32. Therefore, the speed of transferring heat to the first fire extinguishing agent 21 can be increased, and the heat transferred to the first fire extinguishing agent 21 is increased, so that the first fire extinguishing agent 21 is further increased to generate the first fire extinguishing medium.

It should be noted that, a part of the heat carried by the second fire extinguishing medium is transferred to the first fire extinguishing medium through the wall of the heat conducting pipe 32, so that the temperature of the second fire extinguishing medium sprayed from the nozzle 12 can be reduced, thereby preventing the second fire extinguishing medium from causing secondary damage to people and property in the protected space.

In some embodiments, the heat pipes 32 are straight or bent pipes. The heat transfer area of the bent pipe-shaped heat transfer pipe 32 increases as compared with the straight pipe-shaped heat transfer pipe 32, but the transmission speed of the extinguishing medium decreases accordingly. Therefore, the shape of the heat conducting pipe 32 should be determined according to the actual use situation, and the application is not limited herein. In the embodiment of the present application, the heat conductive pipe 32 has a straight pipe shape.

It should be appreciated that the perfluorohexanone fire-extinguishing device 100, when used in practice, when the protected space is too large or narrow and tall, can result in the fire-extinguishing agent not completely extinguishing the fire in the protected space, which can result in an immeasurable hazard. Because the boiling point of the perfluorohexanone fire extinguishing agent is low, when the perfluorohexanone fire extinguishing device 100 is started, vaporized or atomized perfluorohexanone can be sprayed out, and the density of the vaporized or atomized perfluorohexanone is higher than that of air, so that the perfluorohexanone fire extinguishing agent can be suspended in the lower layer area of the protected space all the time. When the perfluorohexanone fire-extinguishing apparatus 100 is applied to an excessively large or narrow and tall protected space, the perfluorohexanone fire-extinguishing agent may not extinguish the flames in the upper area, resulting in immeasurable consequences.

To alleviate the problem of the upper zone of flames not being extinguished, applicants have discovered that the dosage of perfluorohexanone fire-fighting agent can be increased. However, if the amount of the fire extinguishing agent is increased, the cost of the fire extinguishing apparatus 100 is increased, and it is difficult to discharge a large amount of the fire extinguishing agent due to the structural design, and there may be a problem that the residual rate of the fire extinguishing agent is excessively high.

In view of this, in some embodiments, the first extinguishing medium has a density less than the density of air and the second extinguishing medium has a density greater than or equal to the density of air. In actual use, after the device is started, the first extinguishing medium 21 and the second extinguishing medium 22 can respectively generate the first extinguishing medium and the second extinguishing medium, and the first extinguishing medium and the second extinguishing medium are sprayed out from the nozzles 12 to the air in the protected space. Because the density of the first fire extinguishing medium is less than that of air, under the disturbance of high temperature and hot air in a fire scene, the first fire extinguishing medium can move to the upper area of the protected space and extinguish the upper flame; since the density of the second extinguishing medium is greater than or equal to the density of the air, the second extinguishing medium can penetrate the lower region of the protected space and extinguish the flames of the lower layer. Thus, the first fire extinguishing medium and the second fire extinguishing medium are respectively filled in the upper layer area and the lower layer area of the protected space, and the flames of the corresponding areas are extinguished, so that the fire extinguishing device can be used for the overlarge or narrow and high protected space.

It should be noted that the fire extinguishing apparatus 100 can be used not only for an oversized or narrow and tall protection space, but also for a protection space of other scenes, and the application is not limited thereto.

In some embodiments, the first fire-extinguishing agent 21 is liquid perfluorohexanone, the first fire-extinguishing medium generated by the initiation is gaseous perfluorohexanone, the second fire-extinguishing agent 22 is an aerosol generating agent, and the second fire-extinguishing medium generated by the controlled combustion is an aerosol fire-extinguishing medium, both the gaseous perfluorohexanone and the aerosol fire-extinguishing medium being ejected into the ambient air by the nozzle 12.

In actual use, the combustion of the aerosol generating agent generates the aerosol fire extinguishing medium and generates a large amount of heat, and the perfluorohexanone is vaporized into gaseous perfluorohexanone by the sensible heat. After the aerosol fire extinguishing medium and the gaseous perfluorohexanone are sprayed out of the nozzle 12 into the air in the protected space, the aerosol fire extinguishing medium with the density lower than that of the air can move to the upper area of the protected space to extinguish the upper flame, and the gaseous perfluorohexanone with the density higher than that of the air can move to the lower area of the protected space to extinguish the lower flame. Therefore, fire extinguishing medium is filled in the upper layer area and the lower layer area of the protection space, so that flame in the space can be completely extinguished, and loss expansion is prevented.

It can be understood that, compared with the way that the liquid perfluorohexanone in the pressure storage type fire extinguishing apparatus 100 is pushed into the protected space by pressure, the non-pressure storage type fire extinguishing apparatus 100 in the embodiment of the present application utilizes the temperature rise to vaporize the liquid perfluorohexanone into the gaseous perfluorohexanone and then sprays the gaseous perfluorohexanone into the protected space, so as to effectively reduce the residual rate of the perfluorohexanone in the fire extinguishing apparatus 100.

In some embodiments, the fire suppression apparatus 100 further includes an activation device 40 coupled to the second fire suppressant agent 22, the activation device 40 being configured to detect a fire and select whether to ignite the second fire suppressant agent 22 based on the fire. Specifically, the starting device 40 includes one of a heat-sensitive wire and an electronic ignition head, and may be a combination of a heat-sensitive wire and an electronic ignition head.

In particular to the present embodiment, the starting means 40 comprises a heat-sensitive wire, one end of which is placed in the protected space outside the fire extinguishing container 10 and the other end of which passes through the fire extinguishing container 10 to be connected with the aerosol generating agent. In actual use, when a fire breaks out in the protected space, the heat-sensitive wire is thermally activated to burn and ignite the second extinguishing agent 22, thereby generating the second extinguishing medium. At the same time, the heat generated by the combustion activates the first fire extinguishing agent 21, causing it to generate the first fire extinguishing medium. Subsequently, the second extinguishing medium and the first extinguishing medium are rapidly sprayed under pressure from the nozzles 12 towards the protected space to extinguish the flames in the protected space.

In the above fire extinguishing apparatus 100, when in use, that is, when a fire occurs, the second fire extinguishing agent 22 is controlled to burn to generate the second fire extinguishing medium, the heat released by burning is conducted to the first fire extinguishing agent 21 through the heat conducting member 30, the first fire extinguishing agent 21 is heated to generate the first fire extinguishing medium, and the second fire extinguishing medium and the first fire extinguishing medium are discharged to the protection space through the nozzle 12 under the pressure to extinguish the fire; in the non-use state, i.e., when no fire is occurring, the second fire-extinguishing agent 22 is not combusted, and the first fire-extinguishing agent 21 is not activated without being exposed to heat. Thus, the fire extinguishing apparatus 100 generates high pressure only in the use state and does not generate high pressure in the non-use state, thereby effectively improving the safety of the fire extinguishing apparatus 100.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A fire suppression apparatus, comprising:

the fire extinguishing container is provided with an accommodating cavity and a nozzle communicated with the accommodating cavity and the outside;

the heat conducting piece is arranged in the accommodating cavity and divides the accommodating cavity into a first accommodating cavity and a second accommodating cavity, and the first accommodating cavity and the second accommodating cavity are communicated with the outside through the nozzle; and

the first fire extinguishing agent and the second fire extinguishing agent are respectively contained in the first containing cavity and the second containing cavity;

the second fire extinguishing agent is controlled to burn to generate a second fire extinguishing medium, heat generated by burning can be conducted to the first fire extinguishing agent through the heat conducting piece, and the first fire extinguishing agent is heated to generate a first fire extinguishing medium.

2. The fire suppression apparatus of claim 1, wherein the heat conductive member comprises:

and the heat conduction pipe is connected to the partition part in a matching mode and communicated with the second accommodating cavity and the nozzle.

3. The fire suppression apparatus of claim 2, wherein at least a portion of the heat conductive pipe extends into the interior of the first fire suppressant agent.

4. A fire extinguishing apparatus according to claim 3, wherein the heat conductive pipes are at least two in number and are spaced apart from each other.

5. A fire extinguishing apparatus according to claim 3, wherein the heat conductive pipes are straight pipes or bent pipes.

6. The fire suppression apparatus of claim 1, wherein said heat conductive member is a metal heat conductive member.

7. Fire extinguishing apparatus according to claim 1, wherein the first extinguishing medium has a density less than the density of air and the second extinguishing medium has a density greater than or equal to the density of air.

8. The fire extinguishing apparatus of claim 7, wherein the first fire extinguishing agent is liquid perfluorohexanone and the first fire extinguishing medium generated by the activation is gaseous perfluorohexanone, the second fire extinguishing agent is an aerosol generating agent, and the second fire extinguishing medium generated by the controlled combustion is an aerosol fire extinguishing medium, both the gaseous perfluorohexanone and the aerosol fire extinguishing medium being ejected from the nozzle into the ambient air.

9. Fire extinguishing apparatus according to claim 1, wherein the number of jets is at least two.

10. The fire suppression apparatus of claim 1, further comprising an activation device coupled to the second fire suppressant agent, the activation device configured to detect a fire and select whether to ignite the second fire suppressant agent based on the fire.