Static mixer and method of manufacture and use, water-based fire extinguishing agent continuous production device and process

Abstract

The application belongs to the field of mixers, and particularly relates to a static mixer, a preparation method, a water-based fire extinguishing agent continuous production device and a production process. The static mixer comprises a plurality of continuous mixing elements; each mixing element comprises three triangular blades, namely a first triangular blade, a second triangular blade connected with two corner sides of the first triangular blade respectively, and a third triangular blade; and the second triangular blade and the third triangular blade are arranged in opposite directions. The static mixer designed by the technical scheme of the application realizes rapid mixing between fluids, realizes continuous operation in the whole process of pipeline reaction, solves the problems of long stirring time and uneven mixing in the current intermittent operation, and can reduce the working intensity of operators and improve the production efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of mixers, and specifically relates to a static mixer, a preparation method and use thereof, a continuous production apparatus for water-based fire extinguishing agent, and a process therefor. Background Art

[0002] A water-based fire extinguishing agent is a fire extinguishing agent in liquid form. After it is mixed with water at a certain ratio, a non-flammable foam floating layer is formed on the surface of the liquid to achieve the effects of oxygen insulation and heat insulation. Currently, it is widely used to extinguish fires of flammable polar solvents such as alcohols, ethers, ketones, aldehydes and amines, can also be used to extinguish various oil fires, and is suitable for disaster prevention in various places.

[0003] Water-based fire extinguishing agent is usually prepared by mixing solid raw materials such as water and Kathon preservative, and liquid raw materials such as ethylene glycol, diethylene glycol butyl ether, cocamidopropyl betaine and alkyl glycoside in proportion, and the mixing effect of raw materials directly affects the quality of the product.

[0004] At present, most production processes for water-based fire extinguishing agents adopt batch stirred tanks. First, water is added into a stirred tank, soluble solid raw materials are added for stirring, after the solid raw materials are completely dissolved, various liquid raw materials are added sequentially according to the proportion and stirred uniformly; after stirring for a period of time, samples are taken to detect the foaming volume, surface tension and other indicators of the product, and the product is qualified if the indicators meet requirements. This batch process has low degree of automation, the operation is greatly affected by human factors, and the product quality fluctuates greatly.

[0005] The utility model CN202223474082.2 discloses a complete set of system equipment for water-based fire extinguishing agent, the equipment integrates a plurality of raw material storage tanks, a liquid fluid batching unit, a plurality of premixing emulsification tanks, a plurality of blending stirring tanks and a production batching control room, and the plurality of premixing emulsification tanks and the plurality of blending stirring tanks are both located below the liquid fluid batching unit; a static sedimentation tank area, a molecular magnetization box and a finished product storage tank area are sequentially arranged on one side of the integrated platform, and a powder feeding unit is connected to the other side. The core production unit in the apparatus is still a traditional stirred tank, and the production process is batch production.

[0006] The utility models CN201921582427.1 and CN201921588746.3 disclose a stirring reaction apparatus for water-based fire extinguishing agent and a production line, which reduce foam generated during the process of feeding materials into the stirred tank by improving the structure, installation position and connection mode of the stirred tank.

[0007] The invention patent CN201810082113.9 discloses a novel environment-friendly water-based fire extinguishing agent and a preparation method thereof, the patent provides a new formula, after all components are added according to the raw material proportion, stirring is carried out for a certain period of time, and then the final product is obtained.

[0008] Based on the publicly available information above, the production of water-based foam fire extinguishing agents currently mainly uses stirred tanks and is an intermittent operation. This method is relatively flexible and suitable for switching between production processes of various products, but the production efficiency is low, and the product quality is greatly affected by the on-site operators. Summary of the Invention

[0009] The purpose of this invention is to overcome the shortcomings of the prior art and provide a static mixer and its preparation method and application, a continuous production device and process for water-based fire extinguishing agents.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0011] A static mixer includes a plurality of continuous mixing elements; each mixing element includes three triangular blades, namely a first triangular blade, a second triangular blade connected to two corners of the first triangular blade, and a third triangular blade; the second triangular blade and the third triangular blade are arranged in opposite directions.

[0012] Preferably, adjacent mixing elements rotate at an angle φ, causing the overall static mixer to rotate in a spiral shape; preferably, 0°≤φ≤90°.

[0013] The number of the hybrid elements is N, where N≥2, preferably 9-20; more preferably 15.

[0014] Preferably, the first triangular blade includes a first corner side, a second corner side connected to the second triangular blade, and a third corner side connected to the third triangular blade; the first corner side of the adjacent mixing element is connected to the apex of the three triangular blades.

[0015] Preferably, the apex angle of the first triangular blade is 45°≤β≤135°; more preferably 90°; the base angle is 15°≤α<90°; more preferably 45°.

[0016] Preferably, the apex angle of the second and third triangular blades is 45°≤θ≤135°; more preferably, it is 90°; preferably, the base angle of the second and third triangular blades is 90°-α; more preferably, it is 45°.

[0017] Preferably, the first triangular blade is a right triangle, more preferably an isosceles right triangle, with the first angle side being 0.9-0.95 times the pipe diameter;

[0018] Preferably, the second triangular blade and the third triangular blade are congruent triangles; more preferably, the second triangle is a right triangle; and even more preferably, it is an isosceles right triangle.

[0019] Preferably, the angle between the first triangular blade and the second triangular blade is 15° to 90°, preferably 45°; the angle between the first triangular blade and the third triangular blade is 15° to 90°, preferably 45°; preferably, the second triangular blade and the third triangular blade are arranged parallel to each other in opposite directions.

[0020] The present invention also includes a method for preparing the static mixer, comprising the following steps: cutting a square steel plate according to the mixing element, and bending the second triangular blade and the third triangular blade to obtain the mixture; preferably, rotating the square steel plate in the length direction.

[0021] The present invention also includes a continuous production apparatus for a water-based fire extinguishing agent, comprising a feeding unit, a pipeline reactor, a discharge unit, and a control unit connected in sequence; the pipeline reactor is equipped with the static mixer.

[0022] The feeding unit includes a raw material tank and a feeding pipe connected to the raw material tank; the raw material tank includes a liquid raw material tank, a star feeder, and a water tank connected to the solid raw material tank; the feeding pipe is equipped with a feeding pump, a feeding flow meter, and a feeding pressure gauge;

[0023] Preferably, the discharge unit includes a discharge pipeline connected to the pipeline reactor; the outlet of the pipeline reactor is equipped with an online conductivity meter and a pH meter.

[0024] This invention also includes a continuous production process for a water-based fire extinguishing agent, employing the aforementioned continuous production apparatus, specifically comprising the following steps:

[0025] 1) The solid raw material of the water-based fire extinguishing agent enters the water tank at a certain flow rate through a star feeder. The solid material is thoroughly mixed with water in the water tank and combined with external circulation to obtain an aqueous solution of the solid material.

[0026] 2) The aqueous solution of the solid material is transported from the raw material tank to the pipeline reactor through pipelines at a certain flow rate with ethylene glycol, diethylene glycol butyl ether, cocamidopropyl betaine and alkyl glycoside for mixing. The mixed material continues to circulate in the pipeline reactor at a certain circulation ratio to increase the flow velocity in the pipeline, enhance the turbulence, and facilitate the mixing of the material.

[0027] 3) After mixing, a portion of the material is tested for material properties using a conductivity meter and pH meter. If the material does not meet the requirements, the circulation ratio is adjusted to allow this portion of the material to continue circulating, thereby enhancing the mixing degree. If the material meets the requirements, it enters the product storage tank through the outlet pipeline.

[0028] Preferably, in step 2), the feed flow rate of the raw material is in the range of 3L / hour to 144L / hour, and the circulation ratio of the mixed material can be adjusted according to the mixing situation of the material, with the preferred circulation ratio being between 0.1 and 3.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] The static mixer designed in this application enables rapid mixing between fluids, achieving continuous operation in the entire pipeline reaction process. It solves the problems of long stirring time and uneven mixing in current intermittent operation, and can reduce the workload of operators and improve production efficiency.

[0031] As a preferred option, the system utilizes online instruments to monitor the raw material feed flow rate, pH value, and conductivity value after mixing in real time, allowing for the assessment of the raw material mixing state. The integrated control system enables real-time acquisition and automatic control of system production status data, timely response to anomalies during production, adjustment of process parameters, maintenance of production stability, and assurance of product quality. Furthermore, the device's simple structure facilitates the adjustment of operating parameters to suit the production of different water-based foam extinguishing agents, meeting the production needs of various types of extinguishing agents. Attached Figure Description

[0032] Figure 1 A physical image of a static mixer with φ of 0° and no rotation, along with views from different angles;

[0033] Figure 2 The velocity distribution cloud map inside the static mixer without rotation is shown. At this time, the adjacent mixing elements of the static mixer are at an angle of φ = 0°. (a) Velocity distribution cloud map of different cross sections along the axis; (b) Concentration cloud map at x = 0.04275m; (c) Schematic diagram of the flow path.

[0034] Figure 3 The inlet velocity u of the non-rotating static mixer in =0.15m / s, and the number of mixing elements N=15, the CMC mass fraction, i.e. the concentration distribution cloud map, of the static mixer along different cross sections along the axial direction;

[0035] Figure 4 A physical image of a 30° rotary static mixer and views from different angles;

[0036] Figure 5 The velocity distribution cloud map inside the rotary static mixer is shown below: At this time, the adjacent mixing elements of the static mixer are at an angle of φ = 30°; (a) Velocity distribution cloud map of different cross sections along the axis; (b) Concentration cloud map at x = 0.04275m; (c) Schematic diagram of the flow path.

[0037] Figure 6 For a rotary static mixer at an inlet speed u in =0.15m / s, and the number of mixing elements N=15, the CMC mass fraction, i.e. the concentration distribution cloud map, of the static mixer along different cross sections along the axial direction;

[0038] Figure 7 The graph shows the degree of mixing with the inlet velocity for different numbers of mixing elements; (a) a rotary static mixer, (b) a static mixer without rotation;

[0039] Figure 8 Schematic diagrams of different hybrid element structures;

[0040] Figure 9 A comparison chart of the mixing degree of different static mixers;

[0041] Figure 10 A schematic diagram of a static mixer fabricated for a mixing element. Detailed Implementation

[0042] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments.

[0043] Example 1:

[0044] Figure 1 , 4 A static mixer is shown, comprising a plurality of consecutive mixing elements; each mixing element includes three triangular blades: a first triangular blade φ, a second triangular blade 2 connected to two corners of the first triangular blade, and a third triangular blade 3; the second triangular blade 2 and the third triangular blade 3 are arranged in opposite directions. Adjacent mixing elements rotate at an angle φ, causing the overall static mixer to rotate in a spiral shape; preferably, 0°≤φ≤90°. Figure 1 When φ is 0°, Figure 4 The example is illustrated with φ = 30°.

[0045] The first triangular blade includes a first corner side, a second corner side connected to the second triangular blade, and a third corner side connected to the third triangular blade; the first corner side of the adjacent mixing element is connected to the apex of the three triangular blades.

[0046] The number of hybrid elements is N, where N≥2; in this embodiment, N=15 is used for illustration.

[0047] Figure 1 The apex angle of the first triangular blade is 45°≤β≤135°; preferably 90°; the base angle is 15°≤α<90°; preferably 45°.

[0048] The apex angles of the second and third triangular blades are 45°≤θ≤135°; preferably 90°; the base angles of the second and third triangular blades are 90°-α; preferably 45°.

[0049] As one preferred form, the first triangular blade is an isosceles right triangle, the angle between the second and third sides is the vertex angle β of the first triangular blade 90°; the angle between the first and second sides is the base angle α of the first triangular blade 45°; the length of the first side is 0.9-0.95 times the pipe diameter.

[0050] The second and third triangular leaves are congruent triangles, and both are isosceles right triangles.

[0051] Preferably, the angle between the first triangular blade and the second triangular blade is 15° to 90°, preferably 45°, and the angle between the first triangular blade and the third triangular blade is 15° to 90°, preferably 45°; the second triangular blade and the third triangular blade are arranged parallel to each other in opposite directions, that is, the second triangular blade and the third triangular blade are bent at the same angle, but bent in opposite directions.

[0052] The method for preparing the static mixer includes the following steps: cutting a square steel plate according to the mixing elements, and bending the second triangular blade and the third triangular blade to obtain a non-rotating static mixer, as follows. Figure 10 As shown; continue to rotate the square steel plate clockwise or counterclockwise to obtain static mixers with different rotation angles.

[0053] The present invention also includes a method for preparing the static mixer, comprising the following steps: cutting a square steel plate according to the mixing element, and bending the second triangular blade and the third triangular blade to obtain the mixture; preferably, further rotating the square steel plate clockwise or counterclockwise to obtain static mixers with different rotation angles.

[0054] Performance testing of a static mixer with high shear effect. Numerical simulation was used to simulate the flow and mixing process of pure water and CMC (carboxymethyl cellulose) aqueous solution in a pipeline mixer, and the results were compared with commonly used static mixers.

[0055] Figure 1 A physical image and a schematic diagram of a static mixer with no rotational angle between the mixing elements are shown. Figure 2 The simulation results show the degree of mixing, where adjacent mixing elements in the static mixer are at an angle φ = 0°. Figure 2Velocity distribution cloud map inside a static mixer without rotation: (a) Velocity distribution cloud map of different cross sections along the axis; (b) Concentration cloud map at x = 0.04275m; (c) Schematic diagram of the flow path;

[0056] Figure 2 Twelve cross-sections were selected along the direction of fluid flow, with color representing velocity magnitude, red representing high velocity and blue representing low velocity. Figure 2 At the import speed u in The velocity gradient was obtained under the conditions of 0.15 m / s and N = 15 mixing elements. As shown in the figure, after entering the pipe, the fluid quickly forms a certain velocity gradient. This is because the fluid is in a laminar flow state; the velocity is lower near the pipe wall and higher near the center. As the fluid flows through the mixing elements, a velocity gradient is also formed near the blades, which increases with the continuous flow of the fluid, and is particularly pronounced at x = 0.04275 m and 0.057 m. Taking x = 0.04275 m as an example, from... Figure 2 (b) It can be seen that the red solid line represents the outline of the mixing element. In region 1, due to the obstruction of the blades, the flow velocity is relatively low near the blades; in region 2, due to the guiding effect of the blades, the fluid velocity is relatively high in the guiding path formed by the blades. The guiding path is shown in [the diagram]. Figure 2 (c) The maximum flow velocity within the mixer was 0.3265 m / s, 2.18 times the inlet velocity. Notably, at x = 0.019 m, 0.057 m, and 0.114 m, the velocity distribution on both sides of the mixing element was approximately centrosymmetric. This is due to the centrosymmetric shape of the blades of the mixing element, indicating that the blades' influence mechanism on the fluid is roughly the same. After the sixth mixing element (i.e., x = 0.114, 0.171, 0.228 m), the velocity distribution tended to be uniform, indicating that the flow field structure gradually stabilized. However, at the end of the mixing element, i.e., x = 0.285 m, the velocity field changed, showing a slight difference from that at x = 0.228 m. This suggests that the presence of the blades caused both low-velocity and high-velocity regions to form simultaneously near the mixing element. The coexistence of high and low velocity regions is conducive to the formation of vortices and significantly promotes fluid stretching.

[0057] Figure 3 For import speed u inThe concentration distribution cloud map of CMC mass fraction (i.e., concentration gradient) along different cross sections of a static mixer under the conditions of 0.15 m / s and N = 15 mixing elements is shown. Before the fluids contact the mixing elements, due to the density and concentration differences between the two fluids, the CMC solution has already partially mixed with the water, forming a radial concentration gradient. As the two fluids flow through the mixing elements of the static mixer, the CMC solution is guided to the pipe wall by the blades, while the water is guided to the center of the pipe. During this process, the mixing of the fluid near the pipe wall with the fluid from the center of the pipe effectively reduces the radial concentration gradient. Before x = 0.057 m, the concentration field distribution on both sides of the mixing element is also centrosymmetric, indicating that the guiding and blocking effects of the blades at different positions on the fluid are similar. However, as the fluid continues to flow, the concentration distribution gradually becomes asymmetrical. After x = 0.228 m, the concentration distribution is more uniform. Figure 2 It can be seen that the CMC solution concentration at the flow path formed by the blades reaches uniform mixing earlier. Figure 3 The diagram shows that the CMC solution diffuses from the center of the pipe towards the pipe wall, while water flows from the pipe wall towards the center. The mixing element promotes the interaction of these two fluids, enhances mixing, and reduces the concentration gradient.

[0058] Figure 4 A physical image of a rotary static mixer with a φ of 30°, and views from different angles;

[0059] Figure 5 The velocity distribution cloud map inside the rotary static mixer is shown below. At this point, adjacent mixing elements in the static mixer are misaligned at an angle φ = 30°. (a) Velocity distribution cloud map at different axial cross sections; (b) Concentration cloud map at x = 0.04275m; (c) Schematic diagram of the flow path. The results show that after the fluid contacts the mixing elements, a certain velocity gradient is formed around the mixing elements and the pipe wall. The velocity decreases closer to the blades and pipe wall, and vice versa. As the fluid flows, multiple high-speed zones form inside the mixer and gradually merge as the fluid continues to flow. Taking x = 0.04275m as an example, Region 1 represents... Figure 5 (c) shows the flow path, with region 2 around the blade. Figure 5(b) It is evident that the area near the blades is a low-speed region, while the flow path is a high-speed region, with the velocity distribution exhibiting a central symmetry. This is because the obstruction effect of the blades dissipates the fluid's kinetic energy, causing a decrease in velocity, while the guiding effect of the blades increases the fluid velocity. From x = 0.114, 0.171, and 0.228 m, it can be seen that the velocity distribution tends to be uniform at the mixing element with the same horizontal clamp in the flow field, indicating that the flow field structure gradually tends to stabilize. The maximum velocity in the mixer is 0.3153 m / s, which is 2.10 times the inlet velocity. Compared with a static mixer without rotation, the maximum velocity is slightly lower. Due to the rotating structure, the flow path rotates continuously along the axial direction, thus the high-speed region in the flow field moves continuously, causing more vortices to appear in the flow field and increasing the stretching effect on the fluid.

[0060] Figure 6 For a rotary static mixer at an inlet speed u in =0.15m / s, and the number of mixing elements N=15, the CMC mass fraction, i.e. the concentration distribution cloud map, of the static mixer along different cross sections along the axial direction. Figure 6 This demonstrates a rotary static mixer in u in The CMC concentration distribution is shown in the figure under the conditions of a flow rate of 0.15 m / s and 15 mixing elements (N=15). As can be seen from the figure, the CMC solution diffuses radially towards the pipe wall, while the water diffuses towards the center of the pipe. After entering the static mixer, the high-concentration zone of the CMC solution is divided by the mixing elements and continuously moves with the rotation of the mixing elements, eventually disappearing. The rotating mixing elements are centrosymmetric, therefore the concentration distribution is also centrosymmetric. At x=0.019 and 0.03325 m, compared to the static mixer without rotation, the CMC solution diffuses over a larger area. Simultaneously, the concentration distribution is more uniform after x=0.171 m, achieving homogeneous mixing earlier. This is because the rotating structure guides the fluid over a larger area, promoting continuous mixing of the two fluid streams, resulting in faster diffusion of the CMC solution.

[0061] To further quantify the mixing performance, mixing degree was chosen as the evaluation index, and its definition is as follows:

[0062] Mixedness = (1-COV)

[0063]

[0064] Where in the formula C represents the average concentration of the solution at the cross-section. iThis represents the solution concentration at any local location on the cross-section, i.e., the solution concentration at any grid point. When COV is 0, the concentration at any location on the cross-section is equal to the average concentration, indicating complete fluid mixing. Conversely, when COV is 1, the fluids are completely separated, resulting in poor mixing. A Mixedness exceeding 95% is generally considered to indicate homogeneous mixing.

[0065] Figure 7 The mixing degree of rotary and non-rotating static mixers with varying inlet velocity was compared under different numbers of mixing elements (N). The mixing degree of the two mixers was examined under conditions of 3, 6, 9, 12, and 15 mixing elements. From 7(a), it can be seen that the mixing degree of the rotary static mixer increases continuously with increasing inlet velocity and the number of mixing elements, following the same pattern as the non-rotating static mixer. In u in When the inlet velocity is 0.15 m / s and N = 15, the mixing degree of the rotary static mixer is 99.65%, close to 99.9%. As the number of mixing elements increases, the improvement in mixing degree by the inlet velocity becomes smaller. At N = 15, u in Increasing the inlet flow rate from 0.03 to 0.15 m / s resulted in a mixing degree that increased from 97.26% to 99.65%, a mere 2.39% increase. This demonstrates that when the number of mixing elements is large, the inlet flow rate has a limited effect on improving the mixing degree. in =0.15 m / s, increasing N from 3 to 15 increases the mixing degree by 42.28%, but increasing N from 12 to 15 only increases the mixing degree by 1.65%, indicating that the number of mixing elements also has an upper limit on the effect of mixing degree. Meanwhile, at u in At a speed of 0.15 m / s, the mixing degree of the nine mixing elements reaches 95.83%, and the fluid is fully mixed.

[0066] contrast Figure 7 (b) Under all conditions, the mixing efficiency of the rotary static mixer is consistently higher than that of the non-rotating mixer. The mixing degree is significantly improved when the number of mixing elements is small, with an average increase of 18.01% in mixing efficiency at N=3. At N=12, the mixing degree is... in At a velocity of 0.15 m / s, the mixing degree increases from 95.48% to 98.00%, indicating more thorough fluid mixing. As stated above, at u... in At a speed of 0.15 m / s, a static mixer without rotation requires 11 mixing elements to achieve thorough mixing, with a mixing length of 209 mm. In contrast, a rotary static mixer achieves over 95% mixing at a mixing length of 171 mm, reducing the total length by 38 mm compared to the non-rotating mixer. Furthermore, compared to other static mixers, the rotary static mixer requires the shortest length. Therefore, it is evident that blade rotation significantly enhances the mixer's distributed mixing capability, allowing for thorough mixing over a shorter distance.

[0067] In addition, a non-rotating static mixer ( Figure 8 The mixing performance of SEB in this study was compared with that of other commonly used static mixers. Figure 9 Comparison of mixing degrees of different static mixers: (a) Simulation results of mixing degrees of different inlet velocities at the same mixing length; (b) At u in Simulation results of the mixing degree of different mixing elements at a speed of 0.15 m / s; Figure 9 (a) CFD simulation results of different mixing degrees in a static mixer at different inlet velocities. The black dashed line represents the boundary of complete mixing, i.e., Mixedness = 95%. in At a speed of 0.03 m / s, the SEB static mixer exhibits a lower mixing degree than the Kenics static mixer, but at a speed of 0.03 m / s, the mixing degree is higher. in At speeds >0.03 m / s, the SEB static mixer consistently exhibits higher mixing performance than other static mixers. For example, u in At a speed of 0.15 m / s, the mixing degrees of the SEB, CBF, Kenics, LPD, and Komax static mixers are 95.48%, 95.06%, 84.34%, 85.86%, and 83.25%, respectively. As shown in the figure, the mixing degree of each static mixer increases with increasing u. in The increase is due to the increase in [something]. SEB and CBF static mixers in u in The SEB static mixer achieves thorough mixing at a speed of 0.15 m / s, while the other three static mixers fail to do so. This indicates that, for the same mixing element length, the SEB static mixer and distributed mixing exhibit superior performance.

[0068] Figure 9 (b) is u in The figure shows the degree of mixing as a function of the number of mixing elements at a speed of 0.15 m / s. The black dashed line represents a mixing degree of 95%. The mixing degree of the SEB, CBF, Kenics, LPD, and Komax static mixers increases with the number of mixing elements. The minimum number of mixing elements required for complete mixing is 11 (SEB), 12 (CBF), 11 (Kenics), 9 (LPD), and 9 (Komax). Correspondingly, the total lengths required for complete mixing by the SEB, CBF, Kenics, LPD, and Komax static mixers are 209 mm, 237.5 mm, 313.5 mm, 266 mm, and 332.5 mm, respectively. The Komax static mixer requires a longer mixing distance. Compared to Komax, the SEB static mixer reduces the distance for complete mixing by 37.14%. The SEB static mixer can achieve complete mixing in the shortest distance and is the structural design with the highest distributed mixing efficiency among the tested static mixers.

[0069] And from Figure 7As can be seen from the above, the mixing effect of the rotary static mixer is better than that of the non-rotating static mixer SEB. Therefore, it is obvious that among the static mixers involved in this embodiment, the rotary static mixer has the best liquid mixing effect.

[0070] This invention also includes a continuous production process for a water-based fire extinguishing agent, using the aforementioned production apparatus; comprising the following steps:

[0071] 1) The solid raw material of the water-based fire extinguishing agent enters the water tank at a certain flow rate through a star feeder. The solid material is thoroughly mixed with water in the water tank and combined with external circulation to obtain an aqueous solution of the solid material.

[0072] 2) The aqueous solution of the solid material is transported from the raw material tank to the pipeline reactor along with ethylene glycol, diethylene glycol butyl ether, cocamidopropyl betaine, and alkyl glycoside at a certain flow rate. The mixed material continues to circulate in the pipeline reactor at a certain circulation ratio to increase the flow velocity in the pipeline, enhance the turbulence, and facilitate the mixing of the material. The feed flow rate of the raw material ranges from 3 L / hour to 144 L / hour. The circulation ratio of the mixed material can be adjusted according to the mixing situation, and the preferred circulation ratio is between 0.1 and 3.

[0073] 3) After mixing, a portion of the material is tested for material properties using a conductivity meter and pH meter. If the material does not meet the requirements, the circulation ratio is adjusted to allow this portion of the material to continue circulating, thereby enhancing the mixing degree. If the material meets the requirements, it enters the product storage tank through the outlet pipeline.

[0074] The production of water-based fire extinguishing agents utilizes a pipeline reactor. First, water, preservatives, ethylene glycol, cocamidopropyl betaine, and alkyl glycoside foaming agent are continuously added to two raw material storage tanks. The preservatives and water are fed into the water tank at rates of 1 kg / h and 17 kg / h respectively, mixed, and then fed into the pipeline reactor at a flow rate of 18 kg / h. The remaining liquid raw materials—ethylene glycol, cocamidopropyl betaine, and alkyl glycoside foaming agent—are fed into the pipeline reactor at flow rates of 37 kg / h, 28 kg / h, and 17 kg / h respectively, with the average residence time in the pipeline reactor maintained at less than 10 minutes. The product output is 100 kg / h.

[0075] According to the requirements of GB15308-2006, the foaming volume of this product is 600ml when formulated with 1% seawater and 700ml when formulated with 3% seawater; the viscosity is 11.8cp; and the pH value is 7.65. The foaming volume, viscosity and pH value of the product meet the requirements of GB15308-2006 after testing.

[0076] In summary, the static mixer designed in this application enables rapid mixing of fluids, achieves continuous operation in the entire pipeline reaction process, solves the problems of long stirring time and uneven mixing in current intermittent operation, and can reduce the workload of operators and improve production efficiency.

[0077] As a preferred option, the system utilizes online instruments to monitor the raw material feed flow rate, pH value, and conductivity value after mixing in real time, allowing for the assessment of the raw material mixing state. The integrated control system enables real-time acquisition and automatic control of system production status data, timely response to anomalies during production, adjustment of process parameters, maintenance of production stability, and assurance of product quality. Furthermore, the device's simple structure facilitates the adjustment of operating parameters to suit the production of different water-based foam extinguishing agents, meeting the production needs of various types of extinguishing agents.

[0078] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A static mixer, characterized in that, It includes multiple continuous mixing elements; each mixing element includes three triangular blades, namely a first triangular blade, a second triangular blade connected to two corners of the first triangular blade, and a third triangular blade; the second triangular blade and the third triangular blade are arranged in opposite directions; The adjacent mixing elements rotate at an angle ϕ, causing the overall static mixer to rotate in a spiral shape; The first triangular blade includes a first corner side, a second corner side connected to the second triangular blade, and a third corner side connected to the third triangular blade; the first corner side of the adjacent mixing element is connected to the apex of the three triangular blades.

2. The static mixer according to claim 1, characterized in that, 0°<ϕ≤90°.

3. The static mixer according to claim 1, characterized in that, The number of hybrid elements is N, where N≥2.

4. The static mixer according to claim 3, characterized in that, N is 9-20.

5. The static mixer according to claim 3, characterized in that, N is 15.

6. The static mixer according to claim 1, characterized in that, The first triangular leaf has an apex angle of β, where 45° ≤ β ≤ 135°; and a base angle of α, where 15° ≤ α < 90°.

7. The static mixer according to claim 6, characterized in that, The vertex angle β of the first triangular blade is 90°; the base angle α is 45°.

8. The static mixer according to claim 6, characterized in that, The apex angle of the second and third triangular blades is θ, where 45°≤θ≤135°; the base angle of the second and third triangular blades is 90°-α.

9. The static mixer according to claim 6, characterized in that, The apex angle θ of the second and third triangular blades is 90°; the base angle of the second and third triangular blades is 45°.

10. The static mixer according to claim 1, characterized in that, The first triangular blade is a right triangle, and the length of the first side is 0.9-0.95 times the diameter of the pipe.

11. The static mixer according to claim 1, characterized in that, The first triangular leaf is an isosceles right triangle.

12. The static mixer according to claim 1, characterized in that, The second and third triangular blades are congruent triangles.

13. The static mixer according to claim 1, characterized in that, The second triangular blade is a right triangle.

14. The static mixer according to claim 13, characterized in that, The second triangular blade is an isosceles right triangle.

15. The static mixer according to claim 1, characterized in that, The angle between the first triangular blade and the second triangular blade is 15° to 90°; the angle between the first triangular blade and the third triangular blade is 15° to 90°.

16. The static mixer according to claim 15, characterized in that, The angle between the first triangular blade and the second triangular blade is 45°; the angle between the first triangular blade and the third triangular blade is 45°.

17. The static mixer according to claim 1, characterized in that, The second triangular blade is arranged parallel to the third triangular blade in opposite directions.

18. A method for preparing a static mixer according to any one of claims 1-17, characterized in that, The process includes the following steps: cutting a square steel plate into the shape of a mixing element, and bending the second and third triangular blades to obtain the mixture; then rotating the square steel plate clockwise or counterclockwise to obtain static mixers with different rotation angles.

19. An application of the static mixer according to any one of claims 1-17, characterized in that, Applied to pipeline reactors.

20. A continuous production apparatus for a water-based fire extinguishing agent, characterized in that, It includes a feeding unit, a pipeline reactor, a discharge unit, and a control unit connected in sequence; the pipeline reactor is provided with a static mixer as described in any one of claims 1-17.

21. The continuous production apparatus for water-based fire extinguishing agent according to claim 20, characterized in that, The feeding unit includes a raw material tank and a feeding pipe connected to the raw material tank; the raw material tank includes a liquid raw material tank, a star feeder, and a water tank; the feeding pipe is equipped with a feeding pump, a feeding flow meter, and a feeding pressure gauge; The discharge unit includes a discharge pipeline connected to the pipeline reactor; the outlet of the pipeline reactor is equipped with an online conductivity meter and a pH meter.

22. A continuous production process for a water-based fire extinguishing agent, characterized in that, The continuous production apparatus according to any one of claims 20-21 specifically includes the following steps: 1) The solid raw materials of water-based fire extinguishing agents are fed into the water tank at a certain flow rate through a star feeder. The solid materials are thoroughly mixed with water in the water tank and combined with external circulation to obtain an aqueous solution of solid materials. 2) The aqueous solution of the solid material is transported from the raw material tank to the pipeline reactor through pipelines at a certain flow rate with ethylene glycol, diethylene glycol butyl ether, cocamidopropyl betaine and alkyl glycoside for mixing. The mixed material continues to circulate in the pipeline reactor at a certain circulation ratio to increase the flow velocity in the pipeline, enhance the turbulence, and facilitate the mixing of the material. The feed flow rate of the raw materials ranges from 3L / hour to 144L / hour. The circulation ratio of the mixed materials can be adjusted according to the mixing condition of the materials, and the circulation ratio is between 0.1 and 3. 3) After mixing, a portion of the material is tested for material properties using a conductivity meter and pH meter. If the material does not meet the requirements, the circulation ratio is adjusted to allow this portion of the material to continue circulating, thereby enhancing the mixing degree. If the material meets the requirements, it enters the product storage tank through the outlet pipeline.

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