Foam curtain spraying device and foam curtain generating method

Abstract

The invention belongs to the technical field of fire fighting, and particularly relates to a foam curtain spraying device and a foam curtain generating method. The foam curtain spraying device comprises a foam generator and a secondary turbulent flow foaming pipe arranged at the outlet end of the foam generator, a plurality of gas spraying pipes are arranged in the secondary turbulent flow foaming pipe, and the spraying direction of the gas spraying pipes points to the outlet end of the secondary turbulent flow foaming pipe. The generated foam curtain can be kept in a non-dissipation state for a long time, the horizontal spraying distance and the maximum spraying height of foam mixed liquid are increased, and therefore the generated foam curtain can conduct heat insulation on a large space.

Description

Technical Field

[0001] The invention belongs to the technical field of fire fighting, and in particular, relates to a foam curtain spraying device and a foam curtain generating method. Background Art

[0002] In the petrochemical plant area, when a fire occurs in a local area, the high-temperature flame heat radiation generated will cause high-temperature damage to the facilities in the surrounding areas. If the fire is not put out in time, it is likely to cause the originally safe devices or equipment in the nearby area to catch fire. Therefore, it is necessary to take certain thermal protection measures so that when a fire occurs in a local area, thermal protection can be quickly implemented on other surrounding facilities that need to be protected to reduce or even avoid damage caused by the high-temperature flame heat radiation.

[0003] After a fire occurs, in addition to extinguishing the fire, heat insulation and preventing the spread of the flame area are important links to reduce losses. At present, cooling water spray, jet water or fine water mist is generally used around the burning area to prevent the fire in the burning area from further expanding and protect the area around the burning area.

[0004] In areas close to the flame, due to the high temperature, the water mist evaporates quickly and cannot form a complete isolation barrier. In addition, the water mist is light in weight and has a short range. It will diffuse under the action of hot air flow and is not suitable for large-scale scenes such as petrochemical storage tank protection. In addition, the injection pressure of the water mist is often above 4MPa, and the flow rate is low. A single device is generally less than 20L / s, which is less than 30% of an ordinary fire water cannon. The water mist system has high requirements for fire pumps and a narrow fire application range. It is not suitable for large-scale fire fighting sites. Water mist is generally used for the protection of a single pump or personnel, with an effective range of less than 10 square meters. The protected object is small in size and uses handheld protection for firefighting operations. For example, the flow rate of a water mist gun is 2-4L / s and the effective range is 4-6m.

[0005] Firefighting water is a linear jet, which consumes a lot of water. More than 95% of firefighting water will be lost immediately. The utilization rate of firefighting water is very low. Even if multiple firefighting water equipment sprays at the same time, it is difficult to form a two-dimensional protection surface. The protection surface is uneven, which makes the protection blind spot between the adjacent facilities and the flame. The flame heat radiation will directly act on the protected object, resulting in the failure of thermal insulation protection. At present, a large amount of firefighting water is often used at the fire scene in the tank area and device area, such as mobile firefighting cannon, vehicle-mounted firefighting cannon, high-pressure spray truck, etc. The flow rate of these equipment is generally 60-100L / s, and the range is 50-80m. It is suitable for large-scale fire scene disposal and can protect large equipment such as storage tanks, reactors, distillation towers and other large equipment or facilities. However, the large flow of firefighting water causes insufficient water supply, and the ground surface of the firefighting site is seriously flooded and flows everywhere. If the storage tank leaks, the oil products are very likely to form flowing fire with the ground firefighting water, and the fire risk is high, which will cause secondary accidents.

[0006] In addition, fixed tubular spray water cooling isolation is also used in the petrochemical device area. Fixed spray pipes are set around the protected objects. The spray pipes also use multi-hole spraying. There are large gaps between the spray holes. The water curtain cannot form a complete isolation layer and cannot protect high-temperature sensitive equipment, such as spherical tanks. Flame heat radiation will pass through the gaps between adjacent jets and act on the surface of the equipment, forming local high temperatures, causing equipment failure and fire protection failure.

[0007] In summary, there is currently a lack of effective protection means for equipment protection at the fire scene. Therefore, it is urgent to develop a fire-fighting device that can effectively insulate a large area. Summary of the invention

[0008] In view of the technical problems mentioned above, the present invention aims to provide a foam curtain spraying device, which can produce a continuous phase foam curtain, and the foam curtain falls from a high place to form an insulating surface on the vertical plane of the space to effectively insulate.

[0009] The present invention also proposes a foam curtain generation method, which uses the foam curtain spraying device provided by the present invention to form a heat insulation surface on a vertical surface of the space to effectively insulate.

[0010] According to the present invention, a foam curtain spraying device is provided, comprising a foam generator and a secondary turbulent foaming tube arranged at the outlet end of the foam generator, wherein a plurality of gas spraying tubes are arranged in the secondary turbulent foaming tube, and the spraying direction of the gas spraying tube points to the outlet end of the secondary turbulent foaming tube.

[0011] In a preferred embodiment, the secondary flow-turbulating foaming tube is constructed as a truncated cone-shaped cylinder, and the diameter of the secondary flow-turbulating foaming tube on a side away from the foam generator gradually increases.

[0012] In a preferred embodiment, a gas injection pipe is provided on the outer wall of the secondary turbulent foaming tube, and the gas injection pipe is connected to each of the gas injection pipes.

[0013] In a preferred embodiment, the total cross-sectional area of ​​the plurality of gas injection tubes is less than or equal to half of the minimum cross-sectional area within the length range of the secondary turbulent foaming tube in which the gas injection tubes are located.

[0014] In a preferred embodiment, each of the gas injection tubes is located at the lower half of the secondary turbulent foaming tube.

[0015] In a preferred embodiment, the angle between the gas injection tube and the inner surface of the secondary turbulent foaming tube is 15-45°.

[0016] In a preferred embodiment, the distance between two adjacent gas injection tubes is 4-10 mm.

[0017] In a preferred embodiment, a guide tube is provided at the outlet end of the secondary flow-turbulating foaming tube.

[0018] In a preferred embodiment, the guide cylinder is configured as a streamlined cylinder.

[0019] In a preferred embodiment, the outlet end of the guide tube is processed by flanging technology.

[0020] In a preferred embodiment, the foam generator comprises:

[0021] A main shell, wherein at least one air suction hole is provided on a side of the main shell;

[0022] A foam mixture injection pipe disposed at the front end of the main housing;

[0023] a dispersion inlet pipe disposed in the main housing, the dispersion inlet pipe being connected to the foam mixture injection pipe;

[0024] A foam dispersion pipe disposed at the rear end of the main housing;

[0025] A foam expansion tube is arranged at the rear end of the foam dispersion tube, and the foam expansion tube is connected to the secondary turbulent foaming tube.

[0026] In a preferred embodiment, the diameter of the dispersion inlet pipe is smaller than or equal to the diameter of the foam mixture injection pipe.

[0027] According to the present invention, a foam curtain generation method is also provided, which uses the foam curtain spraying device provided by the present invention to generate a continuous phase foam layer, thereby forming a foam curtain.

[0028] Compared with the prior art, the advantages of the present application are as follows.

[0029] Existing foams are mainly used for fire extinguishing, not for heat insulation protection. The foam produced by the current foam generator cannot form a continuous phase, and therefore cannot form a foam curtain in space. It can only be laid on the surface of other objects, so it can only be used for fire extinguishing, not for heat insulation protection. The present invention can increase the foaming multiple of the foam mixture, and the generated foam remains in a continuous state during the process of falling from a height, thereby forming a foam curtain, forming an insulating surface on the vertical surface of the space, thereby effectively insulating. The foam curtain generated by the present invention can remain in a non-dissipated state for a long time, increase the horizontal spray distance and maximum shooting height of the foam mixture, so the foam curtain generated by the present invention can insulate a large space.

[0030] The present invention uses a foam curtain of a certain thickness to implement thermal isolation on the protected object, the isolation layer is more complete, the protection effect is greatly improved, and the hidden danger of heat transfer to the protected object can be avoided.

[0031] Under the same protection conditions, the consumption of the fire extinguishing agent in the present invention is greatly reduced compared with fire water, and the consumption can be reduced by more than 60%.

[0032] The foam curtain spraying device provided by the present invention can implement protection at close range, and the setting distance can be within 20m. The protection range of the foam curtain is larger than that of the fire water cannon, and the application area is wide.

[0033] Compared with the network generating device of the middle multiple foam, the flow resistance of the present invention is reduced and the range is adjustable. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be described below with reference to the accompanying drawings.

[0035] Figure 1 A schematic diagram showing an embodiment of a foam curtain spraying device according to the present invention is shown.

[0036] 1. Foam generator; 11. Main shell; 12. Foam mixture injection pipe; 13. Dispersion inlet pipe; 14. Foam dispersion pipe; 15. Foam expansion pipe; 16. Air suction hole; 2. Secondary turbulent foaming pipe; 3. Gas injection pipe; 4. Gas injection pipe; 5. Guide tube; 6. Control module; 7. Air supply mechanism; 100. Foam curtain injection device.

[0037] In the present application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn according to the actual scale. DETAILED DESCRIPTION

[0038] The present invention will be described below with reference to the accompanying drawings.

[0039] It should be noted that the directional terms or qualifiers "left", "right", etc. used in this application are all relative to the referenced Figure 1 They are not used to define the absolute position of the components involved, but can vary according to specific circumstances. The directional use or qualifiers "front" and "rear" are determined according to the flow direction of the foam. The foam flows from "front" to "rear", that is, "front" refers to Figure 1 The left side of the word "back" refers to Figure 1 on the right side of the screen.

[0040] Embodiment 1:

[0041] Figure 1The structure of the foam curtain spraying device 100 according to the present invention is shown. The foam curtain spraying device 100 comprises a foam generator 1 and a secondary turbulent foaming pipe 2 arranged at the outlet end of the foam generator 1, such as Figure 1 As shown, the secondary turbulence foaming tube 2 is coaxially fixedly arranged at the right end of the foam generator 1. A plurality of gas injection tubes 3 are arranged in the secondary turbulence foaming tube 2, and the injection direction of the gas injection tube 3 points to the outlet end of the secondary turbulence foaming tube 2, and the inlet of the gas injection tube 3 is connected to the external space of the secondary turbulence foaming tube 2. Under this arrangement, air or other gas can be ejected to the right outlet of the secondary turbulence foaming tube 2 through the gas injection tube 3.

[0042] During operation, the foam mixture enters the foam generator 1 from the left end, and the foam generator 1 can generate foam from the foam mixture. Subsequently, the generated foam enters the secondary turbulent foaming tube 2, and air or other gas is ejected at a certain flow rate to the right outlet of the secondary turbulent foaming tube 2 through the gas injection tube 3. In this process, the gas in the gas injection tube 3 is mixed with the foam flowing from the foam generator 1 to the secondary turbulent foaming tube 2, further improving the foamability of the foam.

[0043] In a specific embodiment, the secondary turbulence foaming tube 2 is constructed as a truncated cone-shaped cylinder, and the diameter of the side of the secondary turbulence foaming tube 2 away from the foam generator 1 gradually increases. The left end of the secondary turbulence foaming tube 2 is connected to the right end of the foam generator 1, and the diameter of the left end of the secondary turbulence foaming tube 2 is equal to the diameter of the right end of the foam generator 1. The gas injection tube 3 in the secondary turbulence foaming tube 2 is an active air intake, and the truncated cone-shaped cylinder can prolong the time for the gas ejected from the gas injection tube 3 to mix and collide with the foam, and at the same time, can provide a larger foaming space for further foaming of the foam, thereby improving the foamability of the foam.

[0044] In a specific embodiment, a gas injection pipe 4 is provided on the outer wall of the secondary turbulent foaming tube 2, the gas injection pipe 4 is located outside the secondary turbulent foaming tube 2, the gas injection pipe 4 is connected to each gas injection pipe 3, and the gas injection pipe 4 can supply gas to each gas injection pipe 3. Further, a gas supply mechanism 7 is provided on the gas injection pipe 4, the gas supply mechanism 7 is located outside the secondary turbulent foaming tube 2, the gas supply mechanism 7 can supply gas to the gas injection pipe 3 through the gas injection pipe 4, and can adjust the flow rate of the gas.

[0045] In a preferred embodiment, the foam curtain spraying device 100 also includes a control module 6. A flow sensor (not shown) for monitoring the flow rate of the fluid in the foam mixture injection pipe 12 is provided in the foam generator 1. The control module 6 is electrically connected to the flow sensor and the air supply mechanism 7. After the flow sensor measures the fluid flow in the foam mixture injection pipe 12, the corresponding electrical signal is transmitted to the control module 6. The control module 6 then adjusts the air supply flow of the air supply mechanism 7 according to the electrical signal transmitted by the flow sensor, so that the foam curtain spraying device 100 reaches the optimal foam generation state.

[0046] According to the present invention, in a preferred embodiment, the total cross-sectional area of ​​the plurality of gas injection tubes 3 is less than or equal to half of the minimum cross-sectional area within the length range of the secondary turbulent foaming tube 2 in which the gas injection tubes 3 are located. Figure 1 As shown, the gas injection tube 4 is arranged outside the secondary turbulent foaming tube 2, one end of the gas injection tube 4 is located on the tube wall of the secondary turbulent foaming tube 2, and is connected to the inner cavity of the secondary turbulent foaming tube 2. A plurality of gas injection tubes 3 are located inside the secondary turbulent foaming tube 2 and connected to the secondary turbulent foaming tube 2, the gas injection tube 3 points to the right outlet end of the secondary turbulent foaming tube 2, the length of the gas injection tube 3 extending from left to right is the length range of the secondary turbulent foaming tube 2 where it is located, and the minimum cross-sectional area within the length range of the secondary turbulent foaming tube 2 where it is located is the inner cavity cross-sectional area of ​​the secondary turbulent foaming tube 2 where the gas injection tube 3 is connected to the gas injection tube 4. Through this arrangement, sufficient space is provided for foam flow while ensuring sufficient gas volume.

[0047] In a preferred embodiment, each gas injection tube 3 is located in the lower half of the secondary turbulent foaming tube 2. That is, multiple gas injection tubes 3 are concentrated in the lower half of the secondary turbulent foaming tube 2, and the upper half of the secondary turbulent foaming tube 2 is used for foam circulation.

[0048] In a specific embodiment, a plurality of gas injection tubes 3 are arranged in a row in a divergent shape in the secondary turbulent foaming tube 2. When the central axis of the secondary turbulent foaming tube 2 is parallel to the ground, the angle between the gas injection tube 3 and the horizontal plane is 15 to 45 degrees. Preferably, the angle between the gas injection tube 3 and the inner surface of the secondary turbulent foaming tube 2 is 20 to 30 degrees.

[0049] In a specific embodiment, the diameter of each gas injection pipe 3 is DN4 to DN15. Preferably, the diameter of each gas injection pipe 3 is DN8 to DN10.

[0050] In a specific embodiment, the length of each gas injection tube 3 is 10-40 mm. Preferably, the length of each gas injection tube 3 is 20-30 mm.

[0051] In a specific embodiment, the distance between two adjacent gas injection tubes 3 is 4 to 10 mm. Preferably, the distance between two adjacent gas injection tubes 3 is 6 to 8 mm.

[0052] According to the present invention, Figure 1 As shown, a guide tube 5 is provided at the outlet end of the secondary flow-turbulating foaming tube 2. The guide tube 5 can provide a movement space for further mixing of the foam and air in the secondary flow-turbulating foaming tube 2, thereby improving the foamability of the foam.

[0053] In a preferred embodiment, the guide tube 5 is constructed as a streamlined cylinder, and the outlet end of the guide tube 5 is processed by flanging technology.

[0054] In a preferred embodiment, the angle of the guide tube 5 relative to the horizontal plane can be adjusted. Specifically, a movable bracket (not shown) is provided at the bottom of the guide tube 5, and the movable bracket can be used to adjust the injection angle of the guide tube 5. The caliber of the guide tube 5 is the same as the right end outlet diameter of the secondary flow-turbulating foaming tube 2. The guide tube 5 can be rigidly connected to the secondary flow-turbulating foaming tube 2, or it can be flexibly connected. When the guide tube 5 is rigidly connected to the secondary flow-turbulating foaming tube 2, the secondary flow-turbulating foaming tube 2 moves with the guide tube 5 during the process of adjusting the angle between the guide tube 5 and the horizontal plane. When the guide tube 5 is flexibly connected to the secondary flow-turbulating foaming tube 2, such as being connected by a hose hose, the secondary flow-turbulating foaming tube 2 can remain stationary during the process of adjusting the angle between the guide tube 5 and the horizontal plane.

[0055] In a preferred embodiment, the foam generator 1 includes a main housing 11 , a foam mixture injection pipe 12 , a dispersion inlet pipe 13 , a foam dispersion pipe 14 and a foam expansion pipe 15 .

[0056] The main shell 11 is set as a circular cylindrical structure, and at least one suction hole 16 is set on the side of the main shell 11. The foam mixture injection pipe 12 is set at the front end of the main shell 11, and the foam mixture enters from the left end of the foam mixture injection pipe 12 and is discharged from the right end. After the foam mixture is discharged from the right end of the foam mixture injection pipe 12, it enters the main shell 11. In the process of the foam mixture flowing from left to right in the main shell 11, negative pressure is generated, and the external gas is sucked into the main shell 11 from the suction hole 16, and mixed and collided with the foam mixer, thereby generating foam.

[0057] The dispersion inlet pipe 13 is disposed in the main housing 11, and the left end of the dispersion inlet pipe 13 is connected to the right end of the foam mixture injection pipe 12. The left end of the foam dispersion pipe 14 is connected to the right end of the main housing 11. The left end of the foam expansion pipe 15 is connected to the right end of the foam dispersion pipe 14, and the right end of the foam expansion pipe 15 is connected to the left end of the secondary turbulent foaming pipe 2.

[0058] In a preferred embodiment, the diameter of the dispersion inlet pipe 13 is smaller than or equal to the diameter of the foam mixture injection pipe 12 .

[0059] In one embodiment provided according to the present invention, the inlet diameter of the foam mixture injection pipe 12 is d1, and the total length of the foam mixture injection pipe 12 is not less than 4d1. The outlet diameter of the foam mixture injection pipe 12 is equal to the inlet diameter of the dispersion inlet pipe 13, which is d2, d2 = (0.4 ~ 1.0) d1, preferably, d2 = (0.6 ~ 0.7) d1. The outlet diameter of the secondary turbulent foaming pipe 2 is d3, d3 = (4 ~ 20) d1, preferably, d3 = (8 ~ 15) d1. The axial length of the secondary turbulent foaming pipe 2 is L, L = (2 ~ 12) d1, preferably, L = (4 ~ 8) d1. This arrangement of the present invention can further improve the foaming property of the foam, so that the generated foam can form a foam curtain during the falling process.

[0060] In this embodiment, the inlet flow rate of the foam mixture injection pipe 12 is V (standard volume, in liters), and the liquid injection pressure is P1. The air supply flow rate of the air supply mechanism 7 is M (standard volume, in liters), and the air pressure is P2. According to the required foaming multiple, M = (3-10) V, preferably, M = (4-6) V; P2 = (1.0-1.5) P1, preferably, P2 = (1.1-1.3) P1.

[0061] The diameter of the guide tube 5 is the same as the outlet diameter of the secondary turbulent foaming tube 2. The function of the guide tube 5 is to gradually stabilize the foam in the guide tube 5 after turbulent foaming, forming a fluid with a consistent flow direction, ensuring the uniformity of the injection direction, and fully foaming to reach the maximum foaming state.

[0062] In a preferred embodiment, a flow meter and a pressure gauge are provided on the foam mixture injection pipe 12 , and a flow meter and a pressure gauge are provided on the gas injection pipe 4 .

[0063] According to the present invention, a foam curtain generation method is also provided, which uses the foam curtain spraying device 100 provided by the present invention to generate a continuous phase foam layer, thereby forming a foam curtain.

[0064] Specifically, the foam mixture enters the foam generator 1 from the foam mixture injection pipe 12, and after being sucked by the venturi pipe (i.e., the main shell 11 provided with the suction hole 16), it is foamed for the first time in the suction foaming pipe section (i.e., the foam generator 1) to form foam, and the foam enters the foam expansion pipe 15 with a conical inlet and is ejected outward. Then the foam enters the secondary turbulent foaming pipe 2, in which a plurality of gas injection pipes 3 are arranged at the bottom and side of the foam fluid. When the foam fluid flows through the gas injection pipe 3, a turbulent process occurs, and the foam fluid collides with the gas injection pipe 3. At the same time, the gas ejected from the gas injection pipe 3 is further mixed with the foam after the turbulence to further foam, increasing the foaming multiple, and the gas injection direction is consistent with the flow direction of the air foam. The number and length of the gas injection pipe 3 have a direct impact on the turbulence and secondary foaming effects. If the number of gas injection pipes 3 is too large, the flow resistance of the foam fluid is increased, the degree of foam fragmentation is increased, and it is not conducive to foaming.

[0065] The gas ejected from the gas injection pipe 3 has a driving effect on the foam fluid, thereby increasing the flow rate of the air foam fluid. Since the gas injection pipe 3 is arranged in a divergent shape in the pipe, it has a guiding effect on the flow direction of the foam fluid. After foaming in the secondary foaming area, the volume of the air foam increases, and the flow rate of the foam fluid increases, and then it enters the guide tube 5 and is sprayed to the outside along the wall of the guide tube 5.

[0066] When the foam mixture enters the foam mixture injection pipe 12, the control module 6 dynamically matches the compressed air with the foam mixture according to a predetermined program, so that the fluid flow and pressure in the foam mixture injection pipe 12 match the fluid flow and pressure in the gas injection pipe 4. When the foam mixture flow and pressure change, the control module 6 will adjust the output pressure and flow of the air supply mechanism 7 to ensure that the sprayed foam meets the predetermined value.

[0067] When spraying foam, the gas injection pipe 3 of the secondary turbulent foaming pipe 2 is arranged at the bottom, and the outlet of the guide tube 5 is arranged upward. The range is determined according to the injection pressure and flow rate, and the range of the foam jet can be adjusted by adjusting the angle of the guide tube 5. When the injection flow rate and pressure of the foam mixture are constant, the foaming multiple and flow rate of the foam jet can be adjusted by adjusting the pressure and flow rate of the air supply mechanism 7, and then the range can be adjusted. The faster the outlet flow rate, the farther the foam jet range.

[0068] After the foam is ejected from the guide tube 5, it forms a continuous waterfall sloping downward, and then forms a foam curtain. The number and arrangement of the foam curtains are set according to the size of the flame body and the size of the protected object. The foam curtain is thick and the viscosity of the foam layer is relatively high. Even if the foam curtain is gradually dispersed due to the influence of wind, hot air flow, etc. during the descent process, the entire foam curtain will still maintain a complete curtain shape for a long time, playing a role in isolating the thermal radiation of the flame. When a gap or incomplete edge appears at the bottom of the foam curtain and the integrity of the foam curtain cannot be guaranteed, it is necessary to set another foam curtain injection device 100 at the corresponding position, and the two relay to form a foam curtain with a longer length. The length of a single foam curtain is determined by factors such as the flow rate of the foam mixture, the foaming multiple, and the injection method.

[0069] Existing foams are mainly used for fire extinguishing, not for heat insulation protection. Most of the current foam fire extinguishing methods are low-multiple foams and medium-multiple foams, with a large flow range of 20 to 100 L / s, a range of more than 30m, and a maximum range of 80m. They are applied to the burning oil surface in the form of a foam jet to cover and extinguish the fire, and the mechanism of action is to isolate the air and the cooling liquid surface. After foaming, the volume of the foam expands 6-20 times, the specific surface area of ​​the foam layer increases, and the thermal isolation and blocking effect of the flame is obvious. The viscosity of the foam layer is much greater than that of water, and it is easy to form a planar protective layer. However, the foam in the prior art is generally used for covering and protecting the horizontal surface, and it is impossible to form a continuous foam curtain on the vertical surface of the space. The protection technology and equipment for the vertical surface are lacking, and it cannot be used for heat insulation protection. Moreover, the foam is currently applied in the form of a jet, and there is no relevant equipment and technology for the insulation surface.

[0070] The present invention uses a foam curtain of a certain thickness to implement thermal isolation for the protected object. The isolation layer is more complete, the protection effect is greatly improved, and the hidden danger of heat transfer to the protected object can be avoided. Under the same protection conditions, the consumption of fire extinguishing agent is greatly reduced compared with fire water, and the consumption can be reduced by more than 60%. The foam curtain spraying device 100 can implement protection at a close distance, and the setting distance can be within 20m. The protection range of the foam curtain is larger than that of the fire water cannon, and the applicable surface is increased. Compared with the mesh generating device of the medium multiple foam, the flow resistance of the present invention is reduced and the range is adjustable.

[0071] Embodiment 2: Using low-multiple foam to output the foam curtain.

[0072] In this embodiment, the structure of the foam curtain spraying device 100 is the same as that of the first embodiment. Specifically, the diameter of the foam mixture injection pipe 12 is DN80, and the foam mixture generated by the foam fire truck is injected into the foam curtain spraying device 100 through the foam mixture injection pipe 12 by a fire hose. A liquid flow meter and a pressure gauge are set at the injection port of the foam mixture injection pipe 12, with a range of 0 to 30 L / s and a pressure gauge range of 2.0 MPa. The diameter of the dispersion inlet pipe 13 is DN60, the diameter of the foam expansion pipe 15 is DN100, the length of the main shell 11 is 400 mm, the outlet diameter of the secondary flow-turbulating foaming pipe 2 is 600 mm, and the length of the secondary flow-turbulating foaming pipe 2 is 600 mm. The diameter of the guide tube 5 is the same as the outlet diameter of the secondary flow-turbulating foaming pipe 2, the length of the guide tube 5 is 400 mm, and the outlet edge of the guide tube 5 is a circular flange.

[0073] A total of 30 air injection tubes 3 are arranged in the area of ​​the secondary turbulent foaming tube 2. The diameter of the air injection tube is 6 mm, the length of the injection tube is 30 mm, and the angle with the horizontal plane is 30 degrees.

[0074] This embodiment uses a 3% aqueous film-forming foam mixture to test the performance of the foam curtain. The injection flow rate of the foam mixture is 12L / s and the injection pressure is 0.8MPa. The air injection volume in the gas injection pipe 4 is 48L / s, and the air injection pressure is 0.9MPa. The air compressor is used as the air supply mechanism 7 to supply air. The gas injection pipe 4 is equipped with a gas flow meter and a pressure gauge. The control module 6 adjusts the injection flow rate and pressure of the gas according to the flow rate and pressure of the foam mixture. The angle between the guide tube 5 and the ground is 40°. After the foam curtain is sprayed out through the guide tube 5, the foaming multiple is 18.2, the maximum horizontal spray distance is 19.4m, the maximum shooting height is 12.5~14.0m, the effective thickness of the foam curtain is 400mm, the width of the foam curtain is 1000mm, and the length of the complete foam curtain is 8~9m.

[0075] Comparative Example 1:

[0076] After the guide tube 5 of the second embodiment is removed, the above-mentioned injection test is repeated, and other parameters remain unchanged.

[0077] Specifically, the diameter of the foam mixture injection pipe 12 is DN80, and the foam mixture generated by the foam fire truck is injected into the foam curtain spraying device 100 through the foam mixture injection pipe 12 by a fire hose. A liquid flow meter and a pressure gauge are set at the injection port of the foam mixture injection pipe 12, with a range of 0-30L / s and a pressure gauge range of 2.0MPa. The diameter of the dispersion inlet pipe 13 is DN60, the diameter of the foam expansion pipe 15 is DN100, the length of the main shell 11 is 400mm, the outlet diameter of the secondary turbulent foaming pipe 2 is 600mm, and the length of the secondary turbulent foaming pipe 2 is 600mm.

[0078] A total of 30 air injection tubes 3 are arranged in the area of ​​the secondary turbulent foaming tube 2. The diameter of the air injection tube is 6 mm, the length of the injection tube is 30 mm, and the angle with the horizontal plane is 30 degrees.

[0079] This embodiment uses a 3% aqueous film-forming foam mixture to test the performance of the foam curtain, the injection flow rate of the foam mixture is 12L / s, and the injection pressure is 0.8MPa. The air injection volume in the gas injection pipe 4 is 48L / s, and the air injection pressure is 0.9MPa. The air compressor is used as the air supply mechanism 7 to supply air. The gas injection pipe 4 is equipped with a gas flow meter and a pressure gauge. The control module 6 adjusts the injection flow rate and pressure of the gas according to the flow rate and pressure of the foam mixture.

[0080] The foaming multiple of the sprayed foam is 16.3, the maximum spray distance is 16.4m, the maximum spray height is 8.5-10.0m, the effective thickness of the foam curtain is 340mm, the width of the foam curtain is 800mm, and the length of the complete foam curtain is 6-7m. The results show that the air foam guide tube 5 helps to stabilize the foam fluid, making the foam fluid flow more stable before spraying.

[0081] Comparative Example 2:

[0082] On the basis of the second embodiment, the gas injection pipe 4 is closed, other parameters remain unchanged, and the injection test is repeated.

[0083] Specifically, the diameter of the foam mixture injection pipe 12 is DN80, and the foam mixture generated by the foam fire truck is injected into the foam curtain spraying device 100 through the foam mixture injection pipe 12 by a fire hose. A liquid flow meter and a pressure gauge are set at the injection port of the foam mixture injection pipe 12, with a range of 0 to 30 L / s, and a pressure gauge range of 2.0 MPa. The diameter of the dispersion inlet pipe 13 is DN60, the diameter of the foam expansion pipe 15 is DN100, the length of the main shell 11 is 400 mm, the outlet diameter of the secondary flow-turbulating foaming pipe 2 is 600 mm, and the length of the secondary flow-turbulating foaming pipe 2 is 600 mm. The diameter of the guide tube 5 is the same as the outlet diameter of the secondary flow-turbulating foaming pipe 2, the length of the guide tube 5 is 400 mm, and the outlet edge of the guide tube 5 is a circular flange.

[0084] A total of 30 air injection tubes 3 are arranged in the area of ​​the secondary turbulent foaming tube 2. The diameter of the air injection tube is 6 mm, the length of the injection tube is 30 mm, and the angle with the horizontal plane is 30 degrees.

[0085] This embodiment uses a 3% aqueous film-forming foam mixture to test the performance of the foam curtain. The injection flow rate of the foam mixture is 12L / s and the injection pressure is 0.8MPa. The angle between the guide tube 5 and the ground is 40°. After the foam curtain is ejected through the guide tube 5, the foaming multiple is 10.2, the maximum spray distance is 14.8m, the maximum shot height is 9.5-10.0m, the effective thickness of the foam curtain is 313mm, the width of the foam curtain is 980mm, and the length of the complete foam curtain is 7-8m. The results show that air injection can increase the foaming multiple. The foaming multiple is limited by the mechanical turbulence of the gas injection pipe 3 and the mixed foaming of the atmosphere, and the increase is less than 40%. The thickness, spray distance, shot height and integrity of the foam curtain formed are significantly reduced.

[0086] Comparative Example 3:

[0087] On the basis of the second embodiment, the secondary turbulent foaming tube 2 and the guide tube 5 are removed, and the air supply mechanism 7 is closed.

[0088] Specifically, the diameter of the foam mixture injection pipe 12 is DN80, and the foam mixture generated by the foam fire truck is injected into the foam curtain spraying device 100 through the foam mixture injection pipe 12 by a fire hose. A liquid flow meter and a pressure gauge are set at the injection port of the foam mixture injection pipe 12, with a range of 0 to 30 L / s and a pressure gauge range of 2.0 MPa. The diameter of the dispersion inlet pipe 13 is DN60, the diameter of the foam expansion pipe 15 is DN100, and the length of the main shell 11 is 400 mm.

[0089] In this embodiment, a 3% aqueous film-forming foam mixture is used to test the foam curtain performance. The injection flow rate of the foam mixture is 12 L / s and the injection pressure is 0.8 MPa.

[0090] The foaming multiple of the sprayed foam was measured to be 7.6, and the maximum spray distance was 14.2m. A complete foam curtain structure was not formed, but only a beam of foam jets. The results show that after the low-multiple foam mixture passes through the secondary turbulent foaming tube 2 and the guide tube 5, the foaming multiple can be further increased, and can increase by more than 1 times. With the help of the external air supply mechanism 7, the range of the foam curtain jet is increased.

[0091] Comparative Example 4:

[0092] On the basis of the second embodiment, the injection flow rate of the gas injection pipe 4 is reduced to 12 L / s, other parameters remain unchanged, and the injection test is repeated.

[0093] Specifically, the diameter of the foam mixture injection pipe 12 is DN80, and the foam mixture generated by the foam fire truck is injected into the foam curtain spraying device 100 through the foam mixture injection pipe 12 by a fire hose. A liquid flow meter and a pressure gauge are set at the injection port of the foam mixture injection pipe 12, with a range of 0 to 30 L / s, and a pressure gauge range of 2.0 MPa. The diameter of the dispersion inlet pipe 13 is DN60, the diameter of the foam expansion pipe 15 is DN100, the length of the main shell 11 is 400 mm, the outlet diameter of the secondary flow-turbulating foaming pipe 2 is 600 mm, and the length of the secondary flow-turbulating foaming pipe 2 is 600 mm. The diameter of the guide tube 5 is the same as the outlet diameter of the secondary flow-turbulating foaming pipe 2, the length of the guide tube 5 is 400 mm, and the outlet edge of the guide tube 5 is a circular flange.

[0094] A total of 30 air injection tubes 3 are arranged in the area of ​​the secondary turbulent foaming tube 2. The diameter of the air injection tube is 6 mm, the length of the injection tube is 30 mm, and the angle with the horizontal plane is 30 degrees.

[0095] This embodiment uses a 3% aqueous film-forming foam mixture to test the performance of the foam curtain. The injection flow rate of the foam mixture is 12L / s and the injection pressure is 0.8MPa. The air injection volume in the gas injection pipe 4 is 12L / s and the air injection pressure is 0.9MPa. The air compressor is used as the air supply mechanism 7 to supply air. The gas injection pipe 4 is equipped with a gas flow meter and a pressure gauge. The control module 6 adjusts the injection flow rate and pressure of the gas according to the flow rate and pressure of the foam mixture. The angle between the guide tube 5 and the ground is 40°.

[0096] After the foam curtain is sprayed out through the guide tube 5, the foaming multiple is 13.6, the maximum spraying distance is 16.2m, the maximum spraying height is 10.5-11.0m, the effective thickness of the foam curtain is 346mm, the width of the foam curtain is 910mm, and the length of the complete foam curtain is 7-8m. The results show that air injection can increase the foaming multiple and improve the spraying range, which is the key to the formation of the foam curtain.

[0097] Comparative Example 5:

[0098] On the basis of Example 2, the injection flow rate of the air foam was changed to 96 L / s, and other parameters remained unchanged, and the injection test was repeated.

[0099] Specifically, the diameter of the foam mixture injection pipe 12 is DN80, and the foam mixture generated by the foam fire truck is injected into the foam curtain spraying device 100 through the foam mixture injection pipe 12 by a fire hose. A liquid flow meter and a pressure gauge are set at the injection port of the foam mixture injection pipe 12, with a range of 0 to 30 L / s, and a pressure gauge range of 2.0 MPa. The diameter of the dispersion inlet pipe 13 is DN60, the diameter of the foam expansion pipe 15 is DN100, the length of the main shell 11 is 400 mm, the outlet diameter of the secondary flow-turbulating foaming pipe 2 is 600 mm, and the length of the secondary flow-turbulating foaming pipe 2 is 600 mm. The diameter of the guide tube 5 is the same as the outlet diameter of the secondary flow-turbulating foaming pipe 2, the length of the guide tube 5 is 400 mm, and the outlet edge of the guide tube 5 is a circular flange.

[0100] A total of 30 air injection tubes 3 are arranged in the area of ​​the secondary turbulent foaming tube 2. The diameter of the air injection tube is 6 mm, the length of the injection tube is 30 mm, and the angle with the horizontal plane is 30 degrees.

[0101] This embodiment uses a 3% aqueous film-forming foam mixture to test the performance of the foam curtain. The injection flow rate of the foam mixture is 12L / s and the injection pressure is 0.8MPa. The air injection volume in the gas injection pipe 4 is 96L / s and the air injection pressure is 0.9MPa. The air compressor is used as the air supply mechanism 7 to supply air. The gas injection pipe 4 is equipped with a gas flow meter and a pressure gauge. The control module 6 adjusts the injection flow rate and pressure of the gas according to the flow rate and pressure of the foam mixture. The angle between the guide tube 5 and the ground is 40°.

[0102] After the foam curtain is sprayed out through the guide tube 5, the foaming multiple is 9.6, the maximum spraying distance is 17.2m, the maximum spraying height is 9.5-10.0m, the effective thickness of the foam curtain is 269mm, the width of the foam curtain is 610mm, and the length of the complete foam curtain is 5-6m. The results show that if the air injection volume is too large, the foam will be destroyed and the formed foam layer will be blown away, and effective secondary foaming cannot be carried out, and a qualified foam curtain cannot be formed.

[0103] Embodiment 3: Use medium multiple foam mixed liquid to output foam curtain. The foam mixed liquid is purchased from Yangzhou Jiangya Fire Extinguishing Agent Company.

[0104] The foam curtain spraying device 100 of this embodiment is the same as that of the second embodiment.

[0105] Specifically, the diameter of the foam mixture injection pipe 12 is DN80, and the foam mixture generated by the foam fire truck is injected into the foam curtain spraying device 100 through the foam mixture injection pipe 12 by a fire hose. A liquid flow meter and a pressure gauge are set at the injection port of the foam mixture injection pipe 12, with a range of 0 to 30 L / s, and a pressure gauge range of 2.0 MPa. The diameter of the dispersion inlet pipe 13 is DN60, the diameter of the foam expansion pipe 15 is DN100, the length of the main shell 11 is 400 mm, the outlet diameter of the secondary flow-turbulating foaming pipe 2 is 600 mm, and the length of the secondary flow-turbulating foaming pipe 2 is 600 mm. The diameter of the guide tube 5 is the same as the outlet diameter of the secondary flow-turbulating foaming pipe 2, the length of the guide tube 5 is 400 mm, and the outlet edge of the guide tube 5 is a circular flange.

[0106] A total of 30 air injection tubes 3 are arranged in the area of ​​the secondary turbulent foaming tube 2. The diameter of the air injection tube is 6 mm, the length of the injection tube is 30 mm, and the angle with the horizontal plane is 30 degrees.

[0107] The injection flow rate of the foam mixture is 12L / s, and the injection pressure is 0.8MPa. The air injection volume is 48L / s, and the air injection pressure is 0.9MPa. The air compressor is used as the air supply mechanism 7 to supply air. The gas injection pipe 4 is equipped with a gas flow meter and a pressure gauge. The control module 6 adjusts the gas injection flow rate and pressure according to the flow rate and pressure of the foam mixture. The angle between the guide tube 5 and the ground is 40°. After the foam curtain is sprayed out through the guide tube 5, the foaming multiple is 38.2, the maximum horizontal spray distance is 16.4m, the maximum shot height is 10.1~11.0m, the effective thickness of the foam curtain is 600mm, the width of the foam curtain is 1300mm, and the length of the complete foam curtain is 8~9m.

[0108] The test results show that medium-multiple foam is easier to form a foam curtain than low-multiple foam. The higher the foaming multiple, the thicker and wider the foam curtain are significantly increased.

[0109] Embodiment 4: Use medium multiple foam mixed liquid to output foam curtain. The foam mixed liquid is purchased from Yangzhou Jiangya Fire Extinguishing Agent Company.

[0110] The foam curtain spraying device 100 of this embodiment is the same as that of the second embodiment.

[0111] Specifically, the diameter of the foam mixture injection pipe 12 is DN80, and the foam mixture generated by the foam fire truck is injected into the foam curtain spraying device 100 through the foam mixture injection pipe 12 by a fire hose. A liquid flow meter and a pressure gauge are set at the injection port of the foam mixture injection pipe 12, with a range of 0 to 30 L / s, and a pressure gauge range of 2.0 MPa. The diameter of the dispersion inlet pipe 13 is DN60, the diameter of the foam expansion pipe 15 is DN100, the length of the main shell 11 is 400 mm, the outlet diameter of the secondary flow-turbulating foaming pipe 2 is 600 mm, and the length of the secondary flow-turbulating foaming pipe 2 is 600 mm. The diameter of the guide tube 5 is the same as the outlet diameter of the secondary flow-turbulating foaming pipe 2, the length of the guide tube 5 is 400 mm, and the outlet edge of the guide tube 5 is a circular flange.

[0112] A total of 30 air injection tubes 3 are arranged in the area of ​​the secondary turbulent foaming tube 2. The diameter of the air injection tube is 6 mm, the length of the injection tube is 30 mm, and the angle with the horizontal plane is 30 degrees.

[0113] The injection flow rate of the foam mixture is 12L / s, and the injection pressure is 0.8MPa. The air injection volume is 80L / s, and the air injection pressure is 0.9MPa. The air compressor is used as the air supply mechanism 7 to supply air. The gas injection pipe 4 is equipped with a gas flow meter and a pressure gauge. The control module 6 adjusts the gas injection flow rate and pressure according to the flow rate and pressure of the foam mixture. The angle between the guide tube 5 and the ground is 40°. After the foam curtain is sprayed out through the guide tube 5, the foaming multiple is 48.8, the maximum horizontal spray distance is 18.4m, the maximum shot height is 13.1~14.0m, the effective thickness of the foam curtain is 750mm, the width of the foam curtain is 1550mm, and the length of the complete foam curtain is 11~12m.

[0114] The test results show that as the air supply increases, medium-expansion foam is easier to form a foam curtain, the foaming multiple is higher, and the thickness and width of the foam curtain are significantly increased.

[0115] Embodiment 5: Use high-multiplicity foam mixed liquid to output foam curtain. The foam mixed liquid is purchased from Yangzhou Jiangya Fire Extinguishing Agent Company.

[0116] The foam curtain spraying device 100 of this embodiment is the same as that of the second embodiment.

[0117] Specifically, the diameter of the foam mixture injection pipe 12 is DN80, and the foam mixture generated by the foam fire truck is injected into the foam curtain spraying device 100 through the foam mixture injection pipe 12 by a fire hose. A liquid flow meter and a pressure gauge are set at the injection port of the foam mixture injection pipe 12, with a range of 0 to 30 L / s, and a pressure gauge range of 2.0 MPa. The diameter of the dispersion inlet pipe 13 is DN60, the diameter of the foam expansion pipe 15 is DN100, the length of the main shell 11 is 400 mm, the outlet diameter of the secondary flow-turbulating foaming pipe 2 is 600 mm, and the length of the secondary flow-turbulating foaming pipe 2 is 600 mm. The diameter of the guide tube 5 is the same as the outlet diameter of the secondary flow-turbulating foaming pipe 2, the length of the guide tube 5 is 400 mm, and the outlet edge of the guide tube 5 is a circular flange.

[0118] A total of 30 air injection tubes 3 are arranged in the area of ​​the secondary turbulent foaming tube 2. The diameter of the air injection tube is 6 mm, the length of the injection tube is 30 mm, and the angle with the horizontal plane is 30 degrees.

[0119] The injection flow rate of the foam mixture is 12L / s, and the injection pressure is 0.8MPa. The air injection volume is 48L / s, and the air injection pressure is 0.9MPa. The air compressor is used as the air supply mechanism 7 to supply air. The gas injection pipe 4 is equipped with a gas flow meter and a pressure gauge. The control module 6 adjusts the gas injection flow rate and pressure according to the flow rate and pressure of the foam mixture. The angle between the guide tube 5 and the ground is 40°. After the foam curtain is sprayed out through the guide tube 5, the foaming multiple is 86, the maximum horizontal spray distance is 6.6m, the maximum shot height is 6.1-7.0m, the effective thickness of the foam curtain is 900mm, the width of the foam curtain is 1100mm, and the length of the complete foam curtain is 3-4m.

[0120] The test results show that high-multiplicity foam can easily form a foam curtain, but the foam curtain has a small range and insufficient height, and is not suitable for protecting tall equipment.

[0121] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood 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 one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0122] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0123] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0124] Finally, it should be noted that the above is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A foam curtain spraying device, characterized in that: The invention comprises a foam generator (1) and a secondary turbulent foaming tube (2) arranged at the outlet end of the foam generator (1), wherein a plurality of gas injection tubes (3) are arranged in the secondary turbulent foaming tube (2), and the injection direction of the gas injection tube (3) points to the outlet end of the secondary turbulent foaming tube (2).

2. The foam curtain spraying device according to claim 1, characterized in that: The secondary flow-turbulating foaming tube (2) is constructed as a truncated cone-shaped cylinder, and the diameter of the secondary flow-turbulating foaming tube (2) on the side away from the foam generator (1) gradually increases.

3. The foam curtain spraying device according to claim 2, characterized in that: A gas injection pipe (4) is provided on the outer wall of the secondary turbulent foaming pipe (2), and the gas injection pipe (4) is connected to each of the gas injection pipes (3).

4. The foam curtain spraying device according to claim 3, characterized in that: The total cross-sectional area of ​​the plurality of gas injection tubes (3) is less than or equal to half of the minimum cross-sectional area within the length range of the secondary turbulent foaming tube (2) in which the gas injection tubes (3) are located.

5. The foam curtain spraying device according to claim 4, characterized in that: Each of the gas injection tubes (3) is located at the lower half of the secondary turbulent foaming tube (2).

6. The foam curtain spraying device according to claim 2, characterized in that: The included angle between the gas injection tube (3) and the inner surface of the secondary turbulent foaming tube (2) is in the range of 15 to 45 degrees.

7. The foam curtain spraying device according to claim 2, characterized in that: The distance between two adjacent gas injection tubes (3) is 4 to 10 mm.

8. The foam curtain spraying device according to any one of claims 1 to 7, characterized in that: A flow guide tube (5) is provided at the outlet end of the secondary flow-disturbing foaming tube (2).

9. The foam curtain spraying device according to claim 8, characterized in that: The guide cylinder (5) is configured as a streamlined cylinder.

10. The foam curtain spraying device according to claim 8, characterized in that: The outlet end of the guide tube (5) is processed by flanging technology.

11. The foam curtain spraying device according to any one of claims 1 to 7, characterized in that: The foam generator (1) comprises: A main shell (11), wherein at least one air suction hole (16) is provided on a side of the main shell (11); A foam mixed liquid injection pipe (12) arranged at the front end of the main housing (11); A dispersion inlet pipe (13) disposed in the main housing (11), the dispersion inlet pipe (13) being connected to the foam mixed liquid injection pipe (12); A foam dispersion pipe (14) disposed at the rear end of the main housing (11); A foam expansion pipe (15) is arranged at the rear end of the foam dispersion pipe (14), and the foam expansion pipe (15) is connected to the secondary turbulent foaming pipe (2).

12. The foam curtain spraying device according to claim 11, characterized in that: The diameter of the dispersion inlet pipe (13) is smaller than or equal to the diameter of the foam mixed liquid injection pipe (12).

13. A method for generating a foam curtain, characterized in that: The foam curtain is formed by generating a continuous phase foam layer using the foam curtain spraying device according to any one of claims 1 to 12.

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