A spraying device, spraying method and usage method

Abstract

This invention belongs to the field of fire protection technology, specifically relating to a spraying device, spraying method, and usage method. The spraying device includes an outer cylinder for conveying a liquid medium. The outer cylinder includes an expansion section, a direct current section, and a foam nozzle arranged coaxially from back to front. The expansion section is constructed with an inner diameter that gradually increases from back to front. An air inlet is provided on the wall of the foam nozzle, and a foaming net is provided inside the foam nozzle.

Description

Technical Field

[0001] This invention belongs to the field of fire protection technology, specifically relating to a spraying device, a spraying method, and a method of using the spraying device. Background Technology

[0002] The media used in the petrochemical industry are often flammable and explosive, leading to frequent fire accidents.

[0003] The petrochemical industry produces media with high calorific value and fast combustion speed, resulting in a high heat release rate and high ambient heat radiation. This requires fire monitors to have high fire extinguishing efficiency.

[0004] Currently, conventional deflector-type fire monitors have two operating modes: direct current jet and spray cooling. The extinguishing medium sprayed by this type of fire monitor can only be water or foam concentrate. When spraying foam concentrate, the foaming effect is poor, making it difficult to meet current fire protection needs.

[0005] Therefore, there is an urgent need to develop a spraying device with high foaming efficiency. Summary of the Invention

[0006] To address the technical problems described above, the present invention aims to provide a spraying device to improve foaming efficiency.

[0007] The present invention also proposes a multiphase media fire-fighting method, which uses a spraying device provided according to the present invention to foam and spray out the liquid media.

[0008] According to the present invention, a method for using the spraying device in petrochemical fires is also provided.

[0009] According to the present invention, a spraying device is provided, comprising an outer cylinder for conveying a liquid medium, the outer cylinder comprising an expansion section, a direct flow section and a foam spray pipe arranged coaxially from back to front, the expansion section being configured to gradually increase in inner diameter from back to front, an air inlet being provided on the wall of the foam spray pipe, and a foaming net being provided inside the foam spray pipe.

[0010] In one specific embodiment, a guide plate is coaxially arranged inside the outer cylinder, the guide plate is located within the axial range of the expansion section, the foam nozzle includes a nozzle contraction tube, the nozzle contraction tube is constructed with an inner diameter that gradually decreases from back to front, and the air inlet is disposed on the tube wall of the nozzle contraction tube.

[0011] In one specific embodiment, the diameter of the air inlet is 1 / 20 to 1 / 10 of the diameter of the DC section.

[0012] In one specific embodiment, a plurality of air inlets are uniformly arranged along the circumferential direction in the nozzle contraction tube. The formula for calculating the number n of the air inlets is as follows: n = πqD / 120d, where: q is the flow rate of the liquid medium in the outer cylinder; D is the inner diameter of the DC section; and d is the diameter of the air inlet.

[0013] In one specific embodiment, a nozzle body is coaxially disposed at the front end of the nozzle converging tube, and a nozzle converging tube is coaxially disposed at the front end of the nozzle body. The nozzle converging tube is constructed with an inner diameter that gradually decreases from back to front, and a nozzle outlet tube is coaxially disposed at the front end of the nozzle converging tube.

[0014] In one specific embodiment, the inner wall of the nozzle constriction tube is constructed as an arc shape that is concave towards the central axial direction.

[0015] In one specific embodiment, a conveying pipe for conveying a second medium is coaxially arranged inside the outer cylinder. The conveying pipe is coaxially inserted inside the guide plate. An extension pipe is detachably and coaxially arranged at the front end of the conveying pipe. The extension pipe is located in front of the guide plate. The DC section is detachably connected to the nozzle contraction pipe. The foaming net is arranged between the extension pipe and the nozzle contraction pipe.

[0016] In one specific embodiment, a dry powder shrink tube is coaxially provided at the front end of the extension tube. The dry powder shrink tube is constructed to gradually decrease in size from back to front, and a dry powder outlet tube is coaxially provided at the front end of the dry powder shrink tube.

[0017] In one specific embodiment, the dry powder shrink tube is constructed as an arc shape recessed towards the central axis.

[0018] In one specific embodiment, the dry powder shrink tube and the nozzle shrink tube are configured to move at equal accelerations when the liquid medium flows through them.

[0019] In one specific embodiment, the outer cylinder includes a throat coaxially disposed at the rear end of the expansion section, a contraction section coaxially disposed at the rear end of the throat, the contraction section being constructed with an inner diameter that gradually decreases from back to front, and a water inlet section coaxially disposed at the rear end of the contraction section.

[0020] In one specific embodiment, a rectifier is coaxially arranged in the water inlet section, and the rectifier is coaxially connected to the guide plate through a guide core.

[0021] In one specific embodiment, the DC segment is connected to the expansion segment via a telescopic mechanism, the telescopic mechanism being configured to allow the DC segment to move axially relative to the expansion segment.

[0022] In one specific embodiment, the telescopic mechanism includes: a support section axially disposed on the outer wall of the expansion section, the DC section being movably connected to the support section; a driver disposed on the support section; and a telescopic rod, the driver being connected to the DC section via the telescopic rod, thereby driving the DC section to move coaxially relative to the expansion section.

[0023] According to the present invention, a spraying method is also provided, which uses a spraying device proposed according to the present invention to spray a liquid medium.

[0024] According to the present invention, a method of using the spraying device is also provided, characterized in that the spraying device is used in a petrochemical fire.

[0025] Compared with the prior art, the advantages of this application are as follows.

[0026] This invention employs an air inlet on the outer cylinder, allowing external gas to enter the outer cylinder and mix with the internal liquid medium to produce foam liquid. Based on the design of a guide plate, this invention improves the parameters of the air inlet to increase the foaming ratio of the foam liquid, thus giving the spraying device better foaming efficiency.

[0027] This invention incorporates an extension pipe at the front end of the delivery pipe used for conveying dry powder. By increasing the length of the delivery pipe, the synergistic fire extinguishing effect of dry powder and foam is enhanced, preventing the gas-solid ratio from decreasing due to an excessively short delivery pipe, which would weaken the fire suppression effect of the dry powder. By setting an extension pipe of a suitable length, the liquid medium can encapsulate the dry powder, increasing the distance of the synergistic spraying of dry powder and foam.

[0028] The foam nozzle of the present invention can be separated from the DC section, and the extension tube can be separated from the delivery tube. Through this detachable method, the synergistic spraying of dry powder and foam can be achieved, or the blooming and DC spraying of liquid media can be carried out separately.

[0029] This invention achieves variable acceleration flow of the medium by designing a nozzle contraction tube and a dry powder outlet tube, reducing energy loss during medium injection, lowering the jet diffusion angle, and further improving the individual or synergistic injection effect of dry powder and foam. Attached Figure Description

[0030] The present invention will now be described with reference to the accompanying drawings.

[0031] Figure 1 This is a schematic diagram of an embodiment of the spraying device proposed according to the present invention.

[0032] The reference numerals in the figure are as follows:

[0033] 1. Outer cylinder; 11. Expansion section; 12. Direct current section; 14. Throat; 15. Contraction section; 16. Water inlet section; 17. Foam nozzle; 171. Nozzle contraction tube; 172. Nozzle body; 173. Nozzle contraction tube; 174. Nozzle outlet tube; 175. Air inlet;

[0034] 2. Flow guide component; 21. Flow guide plate; 22. Flow guide core;

[0035] 3. Circular channel;

[0036] 4. Conveying pipe; 41. Foaming net; 42. Extension pipe; 43. Dry powder shrink tube; 44. Dry powder outlet pipe;

[0037] 5. Rectifier;

[0038] 6. Telescopic mechanism; 61. Support section; 62. Driver; 63. Telescopic rod;

[0039] 100. Spraying device.

[0040] In this application, all drawings are schematic and are used only to illustrate the principles of the invention, and are not drawn to scale. Detailed Implementation

[0041] The invention will now be described with reference to the accompanying drawings.

[0042] It should be noted that in this application, the direction of the medium sprayed by the spraying device according to the present invention is described as "rear end", "rear" or similar terms, that is... Figure 1 The left side. The destination of the medium sprayed by the injection device is described as "front," "forward," or similar terms, that is... Figure 1 On the right side.

[0043] Figure 1 The structure of the jetting device 100 according to the present invention is shown. For example... Figure 1 As shown, the injection device 100 includes an outer cylinder 1 for conveying liquid medium.

[0044] In this embodiment, the outer cylinder 1 includes an expansion section 11, a direct current section 12 and a foam nozzle 17 arranged coaxially from back to front. The expansion section 11 is constructed with an inner diameter that gradually increases from back to front. An air inlet 175 is provided on the wall of the foam nozzle 17, and a foaming net 41 is provided inside the foam nozzle 17.

[0045] In this configuration, when the liquid medium flows from back to front inside the outer cylinder 1, it creates a negative pressure within the outer cylinder 1, drawing in gas from outside the outer cylinder 1. This causes the gas to mix with the liquid medium inside the outer cylinder 1, initiating foaming. The mixed liquid medium and gas continue to flow from back to front along the outer cylinder 1. As it passes through the foaming net 41, foaming continues, and the mixture is eventually ejected from the front end of the outer cylinder 1.

[0046] According to a preferred embodiment of the present invention, a guide plate 21 is coaxially arranged inside the outer cylinder 1. The guide plate 21 is located within the axial range of the expansion section 11, and an annular channel 3 is formed between the guide plate 21 and the expansion section 11 to allow the liquid medium to flow through. The foam nozzle 17 includes a nozzle contraction tube 171, which is configured to have a gradually decreasing inner diameter from back to front. An air inlet 175 is provided on the tube wall of the nozzle contraction tube 171.

[0047] In this configuration, when the liquid medium flows to the guide plate 21, it expands radially outward along the expansion section 11 under the redirection effect of the guide plate 21, and is ejected from the annular channel 3. After contacting the direct current section 12, it converges towards the central axis under the action of the direct current section 12, thereby preventing the liquid medium from contacting the air inlet 175. This helps to form a negative pressure, allowing more gas to enter the outer cylinder 1 through the air inlet 175.

[0048] According to a preferred embodiment of the present invention, the diameter of the air inlet 175 is 1 / 20 to 1 / 10 of the diameter of the DC section 12.

[0049] In a preferred embodiment, a plurality of air inlets 175 are evenly arranged along the circumferential direction in the nozzle converging tube 171, and the formula for calculating the number n of air inlets 175 is as follows:

[0050] n=πqD / 120d

[0051] Where: q is the flow rate of the liquid medium inside the outer cylinder 1;

[0052] D is the inner diameter of DC section 12;

[0053] d represents the diameter of the 175mm air intake.

[0054] The parameters of the air inlet 175 of the present invention are designed based on the aforementioned structure, which enables as much gas as possible to enter the outer cylinder 1 through the air inlet 175, thereby allowing the liquid medium in the outer cylinder 1 to obtain a larger foaming ratio when it is ejected.

[0055] According to a preferred embodiment of the present invention, a nozzle body 172 is coaxially disposed at the front end of the nozzle converging tube 171, and the nozzle body 172 is constructed in a cylindrical shape. A nozzle converging tube 173 is coaxially disposed at the front end of the nozzle body 172, and the nozzle converging tube 173 is constructed in a shape with an inner diameter that gradually decreases from back to front. A nozzle outlet tube 174 is coaxially disposed at the front end of the nozzle converging tube 173.

[0056] In this configuration, the flow velocity of the liquid medium can be gradually increased by the progressively decreasing diameter of the nozzle contraction tube 171, the nozzle body 172, the nozzle contraction tube 173, and the nozzle outlet tube 174, so that it can maintain a high velocity when ejected.

[0057] In a preferred embodiment, the inner wall of the nozzle contraction tube 173 is constructed as an arc shape that is concave towards the central axial direction. With this configuration, the liquid medium in the outer cylinder 1 can undergo constant acceleration motion when passing through the nozzle contraction tube 173, reducing energy loss during liquid medium injection, reducing the jet diffusion angle, and increasing the range.

[0058] In a preferred embodiment, a conveying pipe 4 for conveying a second medium is coaxially arranged inside the outer cylinder 1. The conveying pipe 4 is coaxially inserted inside the guide plate 21. An extension pipe 42 is detachably and coaxially arranged at the front end of the conveying pipe 4. The extension pipe 42 is located in front of the guide plate 21. The DC section 12 is detachably connected to the nozzle contraction pipe 171. A foaming net 41 is arranged between the extension pipe 42 and the nozzle contraction pipe 171.

[0059] The conveying pipe 4 is cylindrical and used to convey a solid medium. Specifically, in this embodiment, the solid medium is dry powder, which is carried by a high-pressure airflow within the conveying pipe 4 to achieve the purpose of conveying the dry powder. The dry powder is a powdered extinguishing agent commonly used in the fire protection field, which is well known to those skilled in the art. When using the spraying device 100, the dry powder is conveyed into the conveying pipe 4 from the rear end by a high-pressure airflow, causing the dry powder to flow from back to front along the conveying pipe 4 and finally exit the spraying device 100.

[0060] In this configuration, the delivery pipe 4 is used to transport dry powder. Dry powder is introduced into the delivery pipe 4, while a liquid medium is simultaneously delivered into the outer cylinder 1, ultimately enabling the foam generated by the dry powder and the liquid medium to be sprayed collaboratively at the outlet. Furthermore, after removing the nozzle contraction pipe 171 from the direct current section 12 and the extension pipe 42 from the delivery pipe 4, the liquid medium no longer generates foam, and the spraying device 100 no longer sprays foam liquid, but instead sprays the liquid medium.

[0061] According to a preferred embodiment of the present invention, a dry powder shrink tube 43 is coaxially provided at the front end of the extension tube 42. The dry powder shrink tube 43 is configured to gradually decrease in size from back to front. A dry powder outlet tube 44 is coaxially provided at the front end of the dry powder shrink tube 43.

[0062] With this setup, the flow velocity of the dry powder can be gradually increased by progressively decreasing the diameter of the extension tube 42, the dry powder shrink tube 43, and the dry powder outlet tube 44, so that it can maintain a high speed when sprayed.

[0063] In a preferred embodiment, the dry powder shrink tube 43 is configured as an arc shape recessed towards the central axis. With this configuration, the dry powder within the dry powder shrink tube 43 can undergo constant acceleration motion as it passes through the nozzle shrink tube 173, reducing energy loss during dry powder injection, lowering the diffusion angle, and increasing the range.

[0064] In a preferred embodiment, the front end of the dry powder outlet pipe 44 is flush with the front end of the nozzle outlet pipe 174.

[0065] Furthermore, the DC section 12 is configured to be axially movable relative to the expansion section 11. By adjusting the axial position of the DC section 12 relative to the expansion section 11, the injection angle of the liquid medium after it flows out of the annular channel 3 can be adjusted. Specifically, when the DC section 12 moves relative to the expansion section 11 towards... Figure 1 After the left side (rear end) moves, the liquid medium will scatter along the inner wall of the expansion section 11 through the annular channel 3; when the DC section 12 moves relative to the expansion section 11 towards... Figure 1 After the right side (front end) moves, the liquid medium scatters along the inner wall of the expansion section 11 through the annular channel 3. When the liquid medium comes into contact with the direct current section 12, the direct current section 12 changes the flow direction of the liquid medium, causing it to spray to the right and converge towards the central axis of the spray device 100. By adjusting the axial position of the direct current section 12 relative to the expansion section 11, the position of the convergence point of the liquid medium on the central axis can be adjusted. On the one hand, adjusting the negative pressure at the air inlet 175 position achieves the purpose of adjusting the air intake of the air inlet 175, thereby adjusting the foaming ratio. On the other hand, after removing the foam nozzle 17 from the direct current section 12 and removing the extension pipe 41 from the delivery pipe 4, the conventional fire monitor's bloom mode and direct current mode can be realized.

[0066] According to a specific embodiment of the present invention, the DC section 12 is connected to the expansion section 11 via a telescopic mechanism 6, the telescopic mechanism 6 being configured to allow the DC section 12 to move axially relative to the expansion section 11.

[0067] In this embodiment, the telescopic mechanism 6 includes a support section 61, a driver 62, and a telescopic rod 63. The support section 61 is axially disposed at the edge of the maximum outer diameter of the expansion section 11. The DC section 12 is movably connected to the support section 61, meaning that the DC section 12 can move axially along the support section 61. The driver 62 is fixedly disposed on the support section 61 and is connected to the DC section 12 via the telescopic rod 63. After the driver 62 is activated, it can drive the telescopic rod 63 to move axially, thereby causing the DC section 12 to move coaxially relative to the expansion section 11.

[0068] In one specific embodiment, the support section 61 is connected to the expansion section 11 by welding or other means. The diameter of the support section 61 is slightly smaller than the diameter of the DC section 12 to ensure that the DC section 12 can extend and retract.

[0069] According to the present invention, the outer cylinder 1 further includes a throat 14 coaxially disposed at the rear end of the expansion section 11, and a contraction section 15 coaxially disposed at the rear end of the throat 14. The contraction section 15 is configured such that its inner diameter gradually decreases from rear to front, and a water inlet section 16 is coaxially disposed at the rear end of the contraction section 15. In this configuration, the liquid phase flows sequentially from rear to front along the water inlet section 16, the contraction section 15, the throat 14, the expansion section 11, and the direct flow section 12, and is finally ejected from the injection device 100. As the liquid phase passes through the contraction section 15, the size of the contraction section 15 gradually decreases, thereby increasing the flow velocity of the liquid phase. After passing through the throat 14, the liquid phase is ejected through the annular channel 3 between the expansion section 11 and the guide plate 21.

[0070] In one specific embodiment, the inlet section 16, the contraction section 15, the throat 14, and the expansion section 11 can be connected by welding or casting.

[0071] like Figure 1 As shown, a rectifier 5 is coaxially arranged in the water inlet section 16 of the outer cylinder 1. The rectifier 5 is coaxially connected to the guide plate 21 through the guide core 22. The guide plate 21 and the guide core 22 constitute the guide element 2. The conveying pipe 4 passes coaxially through the rectifier 5, the guide core 22 and the guide plate 21 from back to front.

[0072] The rectifier 5 is installed in the inlet section 16 by welding or other means, and the guide core 22 is connected to the rectifier 5 by welding or other means. The delivery pipe 4 is connected to the rectifier 5 by welding.

[0073] In one embodiment, the diameter of the throat 14 is 0.6-0.9 times, preferably 0.8 times, the diameter of the inlet section 16.

[0074] In one embodiment, the diameter of the guide core 22 is 0.1-0.4 times the diameter of the throat 14, preferably 0.2 times.

[0075] In one embodiment, the maximum diameter of the guide disk 21 is located at the axial center of the expansion section 11, and the maximum diameter of the guide disk 21 is 6-8 times, preferably 7 times, the diameter of the guide core 22.

[0076] In one embodiment, the diameter of the delivery pipe 4 is 0.6-0.95 times the diameter of the guide core 22, preferably 0.8 times.

[0077] In one embodiment, the angle between the inner wall of the contraction section 15 and the central axis is 30°, and the angle between the inner wall of the expansion section 11 and the central axis is 45°.

[0078] In one embodiment, the length of the DC section 12 is 0.2-0.8 times the maximum diameter of the guide plate 21, preferably 0.4-0.6 times, and more preferably 0.5 times.

[0079] In one embodiment, the distance from the air inlet 175 to the rear end face of the nozzle contraction tube 171 is 1-2 cm. The air inlet arranged according to the aforementioned parameters can ensure that the foaming ratio is between 6 and 8 times, and the foam with a foaming ratio of 6-8 times has the highest fire extinguishing efficiency.

[0080] In one embodiment, the angle between the inner wall of the nozzle constriction tube 171 and the central axis is 20-50°, preferably 35°.

[0081] In one embodiment, the diameter of the nozzle body 172 is 0.7-1.2 times, preferably 0.95 times, the maximum diameter of the guide plate 21.

[0082] In one embodiment, the diameter of the nozzle outlet pipe 174 is 0.2-0.6 times the diameter of the nozzle body 172, preferably 0.4 times. The length of the nozzle outlet pipe 174 is 0.6-1 times the diameter of the nozzle outlet pipe 174, preferably 0.8 times. The nozzle converging pipe 173 is of constant speed variation.

[0083] In one embodiment, the diameter of the dry powder outlet pipe 44 is 0.4-0.8 times the diameter of the extension pipe 42, preferably 0.6 times. The length of the dry powder outlet pipe 44 is 2-6 times its diameter, preferably 4 times. The dry powder shrink pipe 43 is of constant speed variation.

[0084] According to the present invention, a spraying method for extinguishing fire using the spraying device 100 provided according to the present invention is provided. In the blooming mode, the foam nozzle 17 and extension pipe 42 are not installed. The telescopic mechanism 6 places the direct current section 12 behind the expansion section 11. The liquid medium is sprayed out through the annular channel 3 between the guide plate 21 and the expansion section 11 through the water inlet section 16, rectifier 5, contraction section 15, throat 14, and expansion section 11 to form the blooming mode.

[0085] In DC mode, the DC section 12 is positioned in front of the expansion section 11 via the telescopic mechanism 6. The foam nozzle 17 can be installed or not. Without the extension pipe 42, the liquid medium passes through the water inlet section 16, rectifier 5, contraction section 15, throat 14, and expansion section 11, and is ejected through the annular channel 3 between the guide plate 21 and the expansion section 11. Then, it is redirected by the DC section 12 and ejected.

[0086] In the dry powder and foam co-jet mode, based on the DC mode, an extension tube 42, a dry powder shrink tube 43 and a dry powder outlet tube 44 are installed. Nitrogen carries dry powder from the rear end of the conveying tube 4, and after passing through the extension tube 42, the dry powder shrink tube 43 and the dry powder outlet tube 44, a dry powder jet is formed and ejected.

[0087] Experimental Example 1

[0088] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0089] The air inlet 175 is 1 cm away from the rear end of the nozzle contraction tube 171. The diameter of the direct current section 12 is 16 cm, the diameter of the air inlet 175 is 0.8 cm, and there are 31 air inlets 175.

[0090] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0091] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis. The nozzle body 172 has a diameter of 8.7cm. The nozzle outlet tube 174 has a diameter of 3.5cm and a length of 2.8cm. The nozzle contraction tube is of constant speed variation.

[0092] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0093] The front end (outlet) of the dry powder outlet pipe 44 is flush with the front end (outlet) of the nozzle outlet pipe 174.

[0094] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 425s and the range was 60m.

[0095] Experimental Example 2

[0096] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0097] The air inlet 175 is 1 cm away from the rear end of the nozzle contraction tube 171. The diameter of the direct current section 12 is 16 cm, the diameter of the air inlet 175 is 0.8 cm, and there are 31 air inlets 175.

[0098] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0099] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis. The nozzle body 172 has a diameter of 8.7cm. The nozzle outlet tube 174 has a diameter of 3.5cm and a length of 2.8cm. The nozzle contraction tube is of constant speed variation.

[0100] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0101] The parameters are the same as in Experiment 1, except that the front end of the dry powder outlet pipe 44 is located 16 cm behind the front end of the nozzle outlet pipe 174.

[0102] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The fire extinguishing time was 530s and the range was 40m.

[0103] Experiment Example 3

[0104] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0105] The air inlet 175 is 1 cm away from the rear end of the nozzle contraction tube 171. The diameter of the direct current section 12 is 16 cm, the diameter of the air inlet 175 is 0.8 cm, and there are 31 air inlets 175.

[0106] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0107] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis. The nozzle body 172 has a diameter of 8.7cm. The nozzle outlet tube 174 has a diameter of 3.5cm and a length of 2.8cm. The nozzle contraction tube is of constant speed variation.

[0108] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0109] The parameters are the same as in Experiment 1, except that the front end of the dry powder outlet pipe 44 is located 12 cm behind the front end of the nozzle outlet pipe 174.

[0110] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 518s and the range was 40.8m.

[0111] Experiment Example 4

[0112] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0113] The air inlet 175 is 1 cm away from the rear end of the nozzle contraction tube 171. The diameter of the direct current section 12 is 16 cm, the diameter of the air inlet 175 is 0.8 cm, and there are 31 air inlets 175.

[0114] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0115] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis. The nozzle body 172 has a diameter of 8.7cm. The nozzle outlet tube 174 has a diameter of 3.5cm and a length of 2.8cm. The nozzle contraction tube is of constant speed variation.

[0116] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0117] The parameters are the same as in Experiment 1, except that the front end of the dry powder outlet pipe 44 is located 8 cm behind the front end of the nozzle outlet pipe 174.

[0118] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 501s and the range was 41.6m.

[0119] Experimental Example 5

[0120] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0121] The air inlet 175 is 1 cm away from the rear end of the nozzle contraction tube 171. The diameter of the direct current section 12 is 16 cm, the diameter of the air inlet 175 is 0.8 cm, and there are 31 air inlets 175.

[0122] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0123] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis. The nozzle body 172 has a diameter of 8.7cm. The nozzle outlet tube 174 has a diameter of 3.5cm and a length of 2.8cm. The nozzle contraction tube is of constant speed variation.

[0124] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0125] The parameters are the same as in Experiment 1, except that the front end of the dry powder outlet pipe 44 is located 4 cm behind the front end of the nozzle outlet pipe 174.

[0126] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 495s and the range was 41.8m.

[0127] Experimental Example 6

[0128] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0129] The air inlet 175 is 1 cm away from the rear end of the nozzle contraction tube 171. The diameter of the direct current section 12 is 16 cm, the diameter of the air inlet 175 is 0.8 cm, and there are 31 air inlets 175.

[0130] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0131] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis. The nozzle body 172 has a diameter of 8.7cm. The nozzle outlet tube 174 has a diameter of 3.5cm and a length of 2.8cm. The nozzle contraction tube is of constant speed variation.

[0132] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0133] The parameters are the same as in Experiment 1, except that the front end of the dry powder outlet pipe 44 is located 3 cm behind the front end of the nozzle outlet pipe 174.

[0134] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 430s and the range was 59.5m.

[0135] Experimental Example 7

[0136] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0137] The air inlet 175 is 1 cm away from the rear end of the nozzle contraction tube 171. The diameter of the direct current section 12 is 16 cm, the diameter of the air inlet 175 is 0.8 cm, and there are 31 air inlets 175.

[0138] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0139] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis. The nozzle body 172 has a diameter of 8.7cm. The nozzle outlet tube 174 has a diameter of 3.5cm and a length of 2.8cm. The nozzle contraction tube is of constant speed variation.

[0140] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0141] The parameters are the same as in Experiment 1, except that the front end of the dry powder outlet pipe 44 is located 3 cm forward of the front end of the nozzle outlet pipe 174.

[0142] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 430s and the range was 59.5m.

[0143] Experimental Example 8

[0144] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0145] The air inlet 175 is 1 cm away from the rear end of the nozzle contraction tube 171. The diameter of the direct current section 12 is 16 cm, the diameter of the air inlet 175 is 0.8 cm, and there are 31 air inlets 175.

[0146] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0147] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis. The nozzle body 172 has a diameter of 8.7cm. The nozzle outlet tube 174 has a diameter of 3.5cm and a length of 2.8cm. The nozzle contraction tube is of constant speed variation.

[0148] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0149] The parameters are the same as in Experiment 1, except that the front end of the dry powder outlet pipe 44 is located 36 cm forward of the front end of the nozzle outlet pipe 174.

[0150] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 435s and the range was 59m.

[0151] Experiment Example 9

[0152] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0153] The air inlet 175 is 1 cm away from the rear end of the nozzle contraction tube 171. The diameter of the direct current section 12 is 16 cm, the diameter of the air inlet 175 is 0.8 cm, and there are 31 air inlets 175.

[0154] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0155] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis. The nozzle body 172 has a diameter of 8.7cm. The nozzle outlet tube 174 has a diameter of 3.5cm and a length of 2.8cm. The nozzle contraction tube is of constant speed variation.

[0156] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0157] The parameters are the same as in Experiment 1, except that the front end of the dry powder outlet pipe 44 is located 9 cm forward of the front end of the nozzle outlet pipe 174.

[0158] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 438s and the range was 58.4m.

[0159] Experimental Example 10

[0160] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0161] The air inlet 175 is 1 cm away from the rear end of the nozzle contraction tube 171. The diameter of the direct current section 12 is 16 cm, the diameter of the air inlet 175 is 0.8 cm, and there are 31 air inlets 175.

[0162] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0163] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis. The nozzle body 172 has a diameter of 8.7cm. The nozzle outlet tube 174 has a diameter of 3.5cm and a length of 2.8cm. The nozzle contraction tube is of constant speed variation.

[0164] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0165] The parameters are the same as in Experiment 1, except that the front end of the dry powder outlet pipe 44 is located 12 cm forward of the front end of the nozzle outlet pipe 174.

[0166] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 441s and the range was 57.8m.

[0167] Experimental Example 11

[0168] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0169] The air inlet 175 is 1 cm away from the rear end of the nozzle contraction tube 171. The diameter of the direct current section 12 is 16 cm, the diameter of the air inlet 175 is 0.8 cm, and there are 31 air inlets 175.

[0170] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0171] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis. The nozzle body 172 has a diameter of 8.7cm. The nozzle outlet tube 174 has a diameter of 3.5cm and a length of 2.8cm. The nozzle contraction tube is of constant speed variation.

[0172] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0173] The parameters are the same as in Experiment 1, except that the front end of the dry powder outlet pipe 44 is located 15cm forward of the front end of the nozzle outlet pipe 174.

[0174] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 451s and the range was 57m.

[0175] Experimental Example Twelve

[0176] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0177] The air inlet 175 is 1 cm away from the rear end of the nozzle contraction tube 171. The diameter of the direct current section 12 is 16 cm, the diameter of the air inlet 175 is 0.8 cm, and there are 31 air inlets 175.

[0178] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0179] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis. The nozzle body 172 has a diameter of 8.7cm. The nozzle outlet tube 174 has a diameter of 3.5cm and a length of 2.8cm. The nozzle contraction tube is of constant speed variation.

[0180] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0181] The parameters are the same as in Experiment 1, except that the front end of the dry powder outlet pipe 44 is located 18 cm forward of the front end of the nozzle outlet pipe 174.

[0182] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 456s and the range was 56m.

[0183] Experimental Example Thirteen

[0184] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0185] The air inlet 175 is 1 cm away from the rear end of the nozzle contraction tube 171. The diameter of the direct current section 12 is 16 cm, the diameter of the air inlet 175 is 0.8 cm, and there are 31 air inlets 175.

[0186] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0187] The inner wall of the nozzle converging tube 171 forms an angle of 35° with the central axis. The diameter of the nozzle body 172 is 8.7cm. The diameter of the nozzle outlet tube 174 is 3.5cm. The length of the nozzle outlet tube 174 is 2.8cm.

[0188] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0189] The front end of the dry powder outlet pipe 44 is flush with the front end of the nozzle outlet pipe 174.

[0190] The parameters are the same as in Experiment 1, except that the inner wall of the nozzle contraction tube 173 is a conical surface.

[0191] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The fire extinguishing time was 450s and the range was 57m.

[0192] Experimental Example Fourteen

[0193] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0194] The air inlet 175 is 1 cm away from the rear end of the nozzle contraction tube 171. The diameter of the direct current section 12 is 16 cm, the diameter of the air inlet 175 is 0.8 cm, and there are 31 air inlets 175.

[0195] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0196] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis. The nozzle body 172 has a diameter of 8.7cm. The nozzle outlet tube 174 has a diameter of 3.5cm. The nozzle outlet tube 174 has a length of 2.8cm. The nozzle contraction tube 173 is of constant speed variation.

[0197] The diameter of the dry powder outlet pipe 44 is 0.6cm, and the length of the dry powder outlet pipe 44 is 2.4cm.

[0198] The front end of the dry powder outlet pipe 44 is flush with the front end of the nozzle outlet pipe 174.

[0199] The parameters are the same as in Experiment 1, except that the inner wall of the dry powder shrink tube 43 is a conical surface.

[0200] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 434s and the range was 59m.

[0201] Experimental Example 15

[0202] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0203] The air inlet 175 is 1 cm away from the rear end of the nozzle contraction tube 171. The diameter of the direct current section 12 is 16 cm, the diameter of the air inlet 175 is 0.8 cm, and there are 31 air inlets 175.

[0204] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0205] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis, the nozzle body 172 has a diameter of 8.7cm, the nozzle outlet tube 174 has a diameter of 3.5cm, and the nozzle contraction tube 173 is of constant speed variation.

[0206] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0207] The front end of the dry powder outlet pipe 44 is flush with the front end of the nozzle outlet pipe 174.

[0208] The parameters are the same as in Experiment 1, except that the length of the nozzle outlet pipe 174 is 1.6 cm.

[0209] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 480s and the range was 52m.

[0210] Experimental Example Sixteen

[0211] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0212] The air inlet 175 is 1 cm away from the rear end of the nozzle contraction tube 171. The diameter of the direct current section 12 is 16 cm, the diameter of the air inlet 175 is 0.8 cm, and there are 31 air inlets 175.

[0213] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0214] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis, the nozzle body 172 has a diameter of 8.7cm, the nozzle outlet tube 174 has a diameter of 3.5cm, and the nozzle contraction tube 173 is of constant speed variation.

[0215] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0216] The front end of the dry powder outlet pipe 44 is flush with the front end of the nozzle outlet pipe 174.

[0217] The parameters are the same as in Experiment 1, except that the length of the nozzle outlet pipe 174 is 2 cm.

[0218] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 462s and the range was 55m.

[0219] Experimental Example 17

[0220] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0221] The air inlet 175 is 1 cm away from the rear end of the nozzle contraction tube 171. The diameter of the direct current section 12 is 16 cm, the diameter of the air inlet 175 is 0.8 cm, and there are 31 air inlets 175.

[0222] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0223] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis, the nozzle body 172 has a diameter of 8.7cm, the nozzle outlet tube 174 has a diameter of 3.5cm, and the nozzle contraction tube 173 is of constant speed variation.

[0224] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0225] The front end of the dry powder outlet pipe 44 is flush with the front end of the nozzle outlet pipe 174.

[0226] The parameters are the same as in Experiment 1, except that the length of the nozzle outlet pipe 174 is 2.4 cm.

[0227] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 443s and the range was 57.6m.

[0228] Experimental Example 18

[0229] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0230] The air inlet 175 is 1 cm away from the rear end of the nozzle contraction tube 171. The diameter of the direct current section 12 is 16 cm, the diameter of the air inlet 175 is 0.8 cm, and there are 31 air inlets 175.

[0231] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0232] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis, the nozzle body 172 has a diameter of 8.7cm, the nozzle outlet tube 174 has a diameter of 3.5cm, and the nozzle contraction tube 173 is of constant speed variation.

[0233] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0234] The front end of the dry powder outlet pipe 44 is flush with the front end of the nozzle outlet pipe 174.

[0235] The parameters are the same as in Experiment 1, except that the length of the nozzle outlet pipe 174 is 3.2 cm.

[0236] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 435s and the range was 59m.

[0237] Experimental Example 19

[0238] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0239] The air inlet 175 is 1 cm away from the rear end of the nozzle contraction tube 171. The diameter of the direct current section 12 is 16 cm, the diameter of the air inlet 175 is 0.8 cm, and there are 31 air inlets 175.

[0240] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0241] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis, the nozzle body 172 has a diameter of 8.7cm, the nozzle outlet tube 174 has a diameter of 3.5cm, and the nozzle contraction tube 173 is of constant speed variation.

[0242] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0243] The front end of the dry powder outlet pipe 44 is flush with the front end of the nozzle outlet pipe 174.

[0244] The parameters are the same as in Experiment 1, except that the length of the nozzle outlet pipe 174 is 3.6 cm.

[0245] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The fire extinguishing time was 440s and the range was 58m.

[0246] Experiment Example 20

[0247] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0248] The air inlet 175 is 1 cm away from the rear end of the nozzle contraction tube 171. The diameter of the direct current section 12 is 16 cm, the diameter of the air inlet 175 is 0.8 cm, and there are 31 air inlets 175.

[0249] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0250] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis, the nozzle body 172 has a diameter of 8.7cm, the nozzle outlet tube 174 has a diameter of 3.5cm, and the nozzle contraction tube 173 is of constant speed variation.

[0251] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0252] The front end of the dry powder outlet pipe 44 is flush with the front end of the nozzle outlet pipe 174.

[0253] The parameters are the same as in Experiment 1, except that the length of the nozzle outlet pipe 174 is 8 cm.

[0254] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 448s and the range was 57.2m.

[0255] Experimental Example 21

[0256] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0257] The air inlet 175 is 1 cm away from the rear end of the nozzle contraction tube 171. The diameter of the direct current section 12 is 16 cm, the diameter of the air inlet 175 is 0.8 cm, and there are 31 air inlets 175.

[0258] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0259] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis. The nozzle body 172 has a diameter of 8.7cm. The nozzle outlet tube 174 has a diameter of 3.5cm and a length of 2.8cm. The nozzle contraction tube is of constant speed variation.

[0260] The diameter of the dry powder outlet pipe 44 is 0.6 cm, and the dry powder shrink tube 43 is of constant speed variation.

[0261] The front end (outlet) of the dry powder outlet pipe 44 is flush with the front end (outlet) of the nozzle outlet pipe 174.

[0262] The parameters mentioned above are the same as in Experiment Example 1, except that the length of the dry powder outlet pipe 44 is 2 cm.

[0263] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The fire extinguishing time was 433s and the range was 59.1m.

[0264] Experimental Example 22

[0265] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0266] The air inlet 175 is 1 cm away from the rear end of the nozzle contraction tube 171. The diameter of the direct current section 12 is 16 cm, the diameter of the air inlet 175 is 0.8 cm, and there are 31 air inlets 175.

[0267] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0268] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis. The nozzle body 172 has a diameter of 8.7cm. The nozzle outlet tube 174 has a diameter of 3.5cm and a length of 2.8cm. The nozzle contraction tube is of constant speed variation.

[0269] The diameter of the dry powder outlet pipe 44 is 0.6 cm, and the dry powder shrink tube 43 is of constant speed variation.

[0270] The front end (outlet) of the dry powder outlet pipe 44 is flush with the front end (outlet) of the nozzle outlet pipe 174.

[0271] The parameters are the same as in Experiment 1, except that the length of the dry powder outlet pipe 44 is 2.8 cm.

[0272] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 428s and the range was 59.6m.

[0273] Experimental Example 23

[0274] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0275] The air inlet 175 is 1 cm away from the rear end of the nozzle converging tube 171, the diameter of the direct current section 12 is 16 cm, and the diameter of the air inlet 175 is 0.8 cm.

[0276] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0277] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis. The nozzle body 172 has a diameter of 8.7cm. The nozzle outlet tube 174 has a diameter of 3.5cm and a length of 2.8cm. The nozzle contraction tube is of constant speed variation.

[0278] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0279] The front end (outlet) of the dry powder outlet pipe 44 is flush with the front end (outlet) of the nozzle outlet pipe 174.

[0280] The parameters are the same as in Experiment 1, except that the number of air inlets 175 is 28.

[0281] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 445s and the range was 63m.

[0282] Experimental Example 24

[0283] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0284] The air inlet 175 is 1 cm away from the rear end of the nozzle converging tube 171, the diameter of the direct current section 12 is 16 cm, and the diameter of the air inlet 175 is 0.8 cm.

[0285] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0286] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis. The nozzle body 172 has a diameter of 8.7cm. The nozzle outlet tube 174 has a diameter of 3.5cm and a length of 2.8cm. The nozzle contraction tube is of constant speed variation.

[0287] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0288] The front end (outlet) of the dry powder outlet pipe 44 is flush with the front end (outlet) of the nozzle outlet pipe 174.

[0289] The parameters are the same as in Experiment 1, except that the number of air inlets 175 is 29.

[0290] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 438s and the range was 62m.

[0291] Experimental Example 25

[0292] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0293] The air inlet 175 is 1 cm away from the rear end of the nozzle converging tube 171, the diameter of the direct current section 12 is 16 cm, and the diameter of the air inlet 175 is 0.8 cm.

[0294] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0295] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis. The nozzle body 172 has a diameter of 8.7cm. The nozzle outlet tube 174 has a diameter of 3.5cm and a length of 2.8cm. The nozzle contraction tube is of constant speed variation.

[0296] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0297] The front end (outlet) of the dry powder outlet pipe 44 is flush with the front end (outlet) of the nozzle outlet pipe 174.

[0298] The parameters are the same as in Experiment 1, except that the number of air inlets 175 is 30.

[0299] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 431s and the range was 61m.

[0300] Experimental Example 26

[0301] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0302] The air inlet 175 is 1 cm away from the rear end of the nozzle converging tube 171, the diameter of the direct current section 12 is 16 cm, and the diameter of the air inlet 175 is 0.8 cm.

[0303] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0304] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis. The nozzle body 172 has a diameter of 8.7cm. The nozzle outlet tube 174 has a diameter of 3.5cm and a length of 2.8cm. The nozzle contraction tube is of constant speed variation.

[0305] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0306] The front end (outlet) of the dry powder outlet pipe 44 is flush with the front end (outlet) of the nozzle outlet pipe 174.

[0307] The parameters are the same as in Experiment 1, except that the number of air inlets 175 is 32.

[0308] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 432s and the range was 59m.

[0309] Experiment Example 27

[0310] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0311] The air inlet 175 is 1 cm away from the rear end of the nozzle converging tube 171, the diameter of the direct current section 12 is 16 cm, and the diameter of the air inlet 175 is 0.8 cm.

[0312] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0313] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis. The nozzle body 172 has a diameter of 8.7cm. The nozzle outlet tube 174 has a diameter of 3.5cm and a length of 2.8cm. The nozzle contraction tube is of constant speed variation.

[0314] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0315] The front end (outlet) of the dry powder outlet pipe 44 is flush with the front end (outlet) of the nozzle outlet pipe 174.

[0316] The parameters are the same as in Experiment 1, except that the number of air inlets 175 is 33.

[0317] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 439s and the range was 59m.

[0318] Experimental Example 28

[0319] Spraying is performed using spray device 100, and the parameters are designed as follows.

[0320] The air inlet 175 is 1 cm away from the rear end of the nozzle converging tube 171, the diameter of the direct current section 12 is 16 cm, and the diameter of the air inlet 175 is 0.8 cm.

[0321] The inner wall of the contraction section 15 forms an angle of 30° with the central axis, the inner wall of the expansion section 11 forms an angle of 45° with the central axis, and the length of the direct current section 12 is 4.6 cm.

[0322] The inner wall of the nozzle contraction tube 171 has an angle of 35° with the central axis. The nozzle body 172 has a diameter of 8.7cm. The nozzle outlet tube 174 has a diameter of 3.5cm and a length of 2.8cm. The nozzle contraction tube is of constant speed variation.

[0323] The diameter of the dry powder outlet pipe 44 is 0.6cm, the length of the dry powder outlet pipe 44 is 2.4cm, and the dry powder shrink pipe 43 is of constant speed variation.

[0324] The front end (outlet) of the dry powder outlet pipe 44 is flush with the front end (outlet) of the nozzle outlet pipe 174.

[0325] The parameters are the same as in Experiment 1, except that the number of air inlets 175 is 34.

[0326] A combined foam and dry powder fire extinguishing experiment and a spray test were conducted on an oil pool with a diameter of 20m. The extinguishing time was 446s and the range was 56.8m.

[0327] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0328] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0329] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A spraying device, characterized in that, The device includes an outer cylinder (1) for conveying liquid media. The outer cylinder (1) includes an expansion section (11), a direct current section (12), and a foam nozzle (17) arranged coaxially from back to front. The expansion section (11) is constructed with an inner diameter that gradually increases from back to front. An air inlet (175) is provided on the wall of the foam nozzle (17). A foaming net (41) is provided inside the foam nozzle (17).

2. The spraying device according to claim 1, characterized in that, A guide plate (21) is coaxially arranged inside the outer cylinder (1). The guide plate (21) is located within the axial range of the expansion section (11). The foam nozzle (17) includes a nozzle contraction tube (171). The nozzle contraction tube (171) is constructed with a shape in which the inner diameter gradually decreases from back to front. The air inlet (175) is disposed on the tube wall of the nozzle contraction tube (171).

3. The spraying device according to claim 2, characterized in that, The diameter of the air inlet (175) is 1 / 20 to 1 / 10 of the diameter of the DC section (12).

4. The spraying device according to claim 3, characterized in that, Multiple air inlets (175) are evenly arranged along the circumferential direction in the nozzle converging tube (171), and the formula for calculating the number n of the air inlets (175) is as follows: n=πqD / 120d Where: q is the flow rate of the liquid medium inside the outer cylinder (1); D is the inner diameter of the DC section (12); d is the diameter of the air inlet (175).

5. The spraying device according to claim 4, characterized in that, A nozzle body (172) is coaxially disposed at the front end of the nozzle converging tube (171), and a nozzle converging tube (173) is coaxially disposed at the front end of the nozzle body (172). The nozzle converging tube (173) is constructed in a shape where the inner diameter gradually decreases from back to front, and a nozzle outlet tube (174) is coaxially disposed at the front end of the nozzle converging tube (173).

6. The spraying device according to claim 5, characterized in that, The inner wall of the nozzle contraction tube (173) is an arc shape that is concave in the central axial direction.

7. The spraying device according to claim 6, characterized in that, A conveying pipe (4) for conveying a second medium is coaxially arranged inside the outer cylinder (1). The conveying pipe (4) is coaxially inserted inside the guide plate (21). An extension pipe (42) is detachably and coaxially arranged at the front end of the conveying pipe (4). The extension pipe (42) is located in front of the guide plate (21). The DC section (12) is detachably connected to the nozzle contraction pipe (171). The foaming net (41) is arranged between the extension pipe (42) and the nozzle contraction pipe (171).

8. The spraying device according to claim 7, characterized in that, A dry powder shrink tube (43) is coaxially provided at the front end of the extension tube (42). The dry powder shrink tube (43) is constructed in a shape that gradually decreases in size from back to front. A dry powder outlet tube (44) is coaxially provided at the front end of the dry powder shrink tube (43).

9. The spraying device according to claim 8, characterized in that, The dry powder shrink tube (43) is constructed as an arc shape that is concave towards the central axis.

10. The spraying device according to claim 9, characterized in that, The dry powder shrink tube (43) and the nozzle shrink tube (173) are configured to move at equal acceleration when the liquid medium flows through them.

11. The spraying device according to any one of claims 1 to 10, characterized in that, The outer cylinder (1) includes a throat (14) coaxially disposed at the rear end of the expansion section (11), and a contraction section (15) coaxially disposed at the rear end of the throat (14). The contraction section (15) is constructed in a shape with an inner diameter that gradually decreases from back to front, and a water inlet section (16) coaxially disposed at the rear end of the contraction section (15).

12. The spraying device according to claim 11, characterized in that, A rectifier (5) is coaxially arranged in the water inlet section (16), and the rectifier (5) is coaxially connected to the guide plate (21) through the guide core (22).

13. The spraying device according to any one of claims 1 to 10, characterized in that, The DC section (12) is connected to the expansion section (11) via a telescopic mechanism (6), which is configured to allow the DC section (12) to move axially relative to the expansion section (11).

14. The spraying device according to claim 13, characterized in that, The telescopic mechanism (6) includes: A support section (61) is axially disposed on the outer wall of the expansion section (11), and the DC section (12) is movably connected to the support section (61); The driver (62) is mounted on the support section (61); and The telescopic rod (63) is connected to the DC section (12) via the driver (62), thereby driving the DC section (12) to move coaxially relative to the expansion section (11).

15. A spraying method, characterized in that, The liquid medium is sprayed using the spraying device according to any one of claims 1 to 14.

16. A method of using the spraying device according to any one of claims 1 to 14, characterized in that, The spraying device was used in petrochemical fires.

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