System and method for continuous mixed production of under-pressure foam fine structure

Abstract

The invention discloses a system for continuously mixing and producing a pressurized liquid fine structure, and aims to provide a pressurized liquid strengthening component which is small in particle size and stable in structure. According to the technical scheme, the mixer comprises a mixer body, a mixing cavity is formed in the mixer body, the lower end of the mixer body is provided with a gas inlet channel extending to the mixing cavity, the left end of the mixer body is provided with a liquid inlet channel extending to the mixing cavity, and the right end of the mixer body is provided with an outlet channel extending to the mixing cavity; an annular mixing channel is further arranged between the outlet channel and the mixing cavity, the annular mixing channel is communicated with the gas inlet channel, and an outlet of the annular mixing channel is communicated with the mixing cavity; belongs to the field of chemical production.

Description

Technical Field

[0001] The present invention belongs to the field of chemical production, and particularly relates to a system for continuously mixing and producing pressurized liquid microstructures. Background Art

[0002] The sizes of ordinary droplets and bubbles range from a few millimeters to a few centimeters. The sizes of micro-droplets and micro-bubbles can reach micrometers and below. At this scale, micro-droplets and micro-bubbles exhibit physicochemical properties that are completely different from those in the macroscopic world. The combined action of the surface tension and shear force of micro-droplets enables them to form and maintain a stable shape in micro-channels. The major chemical reaction rates of micro-droplets and micro-bubbles are significantly increased compared to the bulk phase, and reducing the diameter of micro-droplets can significantly increase the chemical reaction rate. The production technologies of micro-droplets and micro-bubbles are widely applied in fields such as chemistry and life sciences, especially in scenarios that require efficient mass transfer and precise control of reaction conditions.

[0003] Foam extinguishing agents with smaller particle sizes can cover the fire source more quickly, improving the fire extinguishing efficiency. At the same time, the pressurized liquid microstructures can better resist the interference of external factors such as wind, maintaining the stability and persistence of the foam. Therefore, developing a strengthening component that can continuously mix and produce pressurized liquid microstructures is of great significance for enhancing the fire extinguishing effect of fire fighting.

[0004] Currently, the deficiencies in the production technologies of micro-droplets and micro-bubbles are mainly reflected in the uniformity, monodispersity of droplets, and cost issues. For example, the high-speed stirring method will produce larger droplets. Although the registration and assembly technology has strong controllability, it is difficult to achieve extremely high uniformity. Existing production methods, especially in large-scale production, still face challenges in achieving high dispersibility. The fluctuations in droplet size will affect the quality and performance of the final product. Moreover, the currently relatively effective processes and equipment for producing micro-droplets and micro-bubbles also face excessively high costs. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the main purpose of the present invention is to propose a strengthening component for continuously mixing and producing pressurized liquid microstructures, which can produce pressurized micro-droplets and micro-bubbles with smaller particle sizes and stable structures.

[0006] To achieve the above object, the first technical solution provided by the present invention is as follows:

[0007] A system for continuously mixing and producing pressurized liquid microstructures, including a liquid storage tank. The liquid storage tank is connected to a plunger pump through a pipeline, and the plunger pump is connected to a gas-liquid mixer through a pipeline; the gas-liquid mixer is connected to a booster pump through a pipeline, and the booster pump is connected to a water and oil removal tank 1 through a pipeline; the water and oil removal tank 1 is connected to an air compressor through a pipeline;

[0008] The described gas-liquid mixer includes a mixer body. A mixing chamber is provided inside the mixer body. A gas inlet channel extending to the mixing chamber is provided at the lower end of the mixer body, a liquid inlet channel extending to the mixing chamber is provided at the left end, and an outlet channel extending to the mixing chamber is provided at the right end. An annular mixing channel is further provided between the outlet channel and the mixing chamber. The annular mixing channel is communicated with the gas inlet channel, and the outlet of the annular mixing channel is communicated with the mixing chamber.

[0009] Further, in the above-mentioned system for continuously mixing and producing a pressurized liquid with a fine structure, a first one-way valve is provided on the pipeline connecting the plunger pump and the gas-liquid mixer.

[0010] Further, in the above-mentioned system for continuously mixing and producing a pressurized liquid with a fine structure, a second digital display pressure gauge, a second one-way valve, a gas flow meter, and a pressure reducing valve are successively provided on the pipeline connecting the gas-liquid mixer and the booster pump.

[0011] Further, in the above-mentioned system for continuously mixing and producing a pressurized liquid with a fine structure, a first outlet valve is provided on the air compressor, a second outlet valve is provided on the booster pump, and a third outlet valve is provided on the water and oil removal tank 1.

[0012] Further, in the above-mentioned system for continuously mixing and producing a pressurized liquid with a fine structure, a pressure gauge connection interface extending to the mixing chamber is further provided at the upper end of the mixer body, and a first digital display pressure gauge is connected to the pressure gauge interface.

[0013] Further, in the above-mentioned system for continuously mixing and producing a pressurized liquid with a fine structure, one end of the outlet channel located inside the mixer body is further connected with a mixing chamber outlet connection pipe. The mixing chamber outlet connecting piece is fixedly connected to the outer surface of the annular mixing channel; the outlet channel is communicated with an external pipeline; and the gas inlet channel, the liquid inlet channel, and the outlet channel are all communicated with the mixing chamber through pipelines.

[0014] Further, in the above-mentioned system for continuously mixing and producing a pressurized liquid with a fine structure, the diameters of the channels of the gas inlet channel, the liquid inlet channel, the outlet channel, and the pressure gauge connection interface are all 1.5 mm; the diameter of the mixing chamber 50 is 2.8 - 3.2 mm; and the diameter of the mixing chamber outlet connection pipe is 0.5 - 1 mm.

[0015] The second technical solution provided by the present invention is a method for continuously mixing and producing a pressurized liquid with a fine structure, which is produced by using the system for continuously mixing and producing a pressurized liquid with a fine structure described in the first technical solution.

[0016] Further, in the above-mentioned method for continuously mixing and producing a pressurized liquid with a fine structure, the following steps are successively included:

[0017] S1: Turn on the air compressor, the first outlet valve of the air compressor, and the third outlet valve of the water and oil removal tank. When the pressure inside the booster pump reaches 2 - 3 MPa, open the second outlet valve of the booster pump. During this process, the pressure at the outlet of the air compressor needs to be stabilized at 0.4 - 0.8 MPa;

[0018] S2: Adjust the pressure reducing valve to adjust the pressure to the pressure tolerance range of the gas flowmeter, which is 0 - 1 MPa, and control the gas flow rate to be 0.2 - 0.6 m 3 / h through the gas flowmeter;

[0019] S3: Continuously supply compressed gas to the gas - liquid mixer. After being processed by the water and oil removal tank 1, the water content of the compressed gas is ≤ 50 ppm;

[0020] S4: Start the plunger pump and transport the liquid contained in the liquid storage tank to the gas - liquid mixer at a flow rate of 15 - 100 ml / min, and control the liquid phase viscosity to be 20 - 200 mPa·s;

[0021] S5: Under the condition of maintaining the gas - liquid volume ratio of 1:50 - 1:150, the pressure in the mixing chamber is monitored in real - time through the first digital display pressure gauge connected to the upper interface of the gas - liquid mixer. When the pressure in the mixing chamber reaches 0.25 MPa, uniformly sized compressed gas foam can be generated.

[0022] One of the technical solutions in the above - mentioned technical solutions has at least the following advantages or beneficial effects:

[0023] 1. In the technical solution provided by the present invention, the compressed gas generated by the air compressor and the foam solution of the liquid to be treated enter the mixing chamber from the gas phase inlet and the liquid phase inlet respectively. The liquid forms a circular jet or a liquid film jet in the mixing chamber. Due to the small inlet diameter, the flow rate of the gas entering the mixing chamber is high, and the strong shear force generated will tear the liquid film and liquid column into fine liquid droplets. And after the gas enters the mixing chamber, it dissolves in the liquid, forms bubbles inside the liquid, and flows in a bubble - like form in the mixing chamber. The bubbles accelerate, deform, and expand during the two - phase flow process, squeeze the liquid into a filamentous shape at the outlet of the mixing chamber, and due to the decrease in the outlet diameter, the flow rate of the gas - liquid mixture ejected increases sharply. Since the pressure difference between the inside and outside of the bubble suddenly increases and expands sharply within a very short distance from the outlet of the mixing chamber, secondary rupture occurs, and the bubble diameter is further reduced.

[0024] 2. In the technical solution provided by the present invention, the outlet channel of the mixing chamber and the main body of the mixing head form an annular channel as the gas inlet, which avoids blocking the gas inlet channel due to the displacement of the outlet channel of the mixing chamber.

[0025] 3. The technical solution provided by the present invention has a simple structure, is easy to process, has a low cost, strong practicability, and the outlet channel of the mixing chamber is replaceable. It is made of stainless steel and can be used under the working conditions of a pressure of 20 MPa and a temperature of 500 °C, with a wider range of applicable conditions.

[0026] 4. The pressurized liquid generated by the technical solution provided by the present invention has a nano-scale gas-liquid interface, a thick foam wall and a stable structure, with a good gas-liquid strengthening effect, greatly increasing the gas-liquid contact area and improving the mass transfer and heat transfer performance of the reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the drawings and embodiments;

[0028] Figure 1 is a three-dimensional structure schematic diagram of the gas-liquid mixer of the present invention;

[0029] Figure 2 is a planar structure schematic diagram of the gas-liquid mixer of the present invention;

[0030] Figure 3 is a schematic diagram of the overall device process of the present invention.

[0031] Figure 4 is a microstructural diagram of the pressurized air foam prepared in Example 2;

[0032] Figure 5 is a micro-particle size distribution diagram of the pressurized air foam prepared in Example 2;

[0033] Figure 6 is a microstructural diagram of the pressurized air foam prepared in Example 3;

[0034] Figure 7 is a micro-particle size distribution diagram of the pressurized air foam prepared in Example 3;

[0035] Among them, the reference numerals of each figure:

[0036] Liquid storage tank 1, plunger pump 2, first one-way valve 3, air compressor 4, first outlet valve 401, gas-liquid mixer 5, mixer main body 501, mixing chamber outlet connecting pipe 502, outlet channel 503, liquid inlet channel 504, gas inlet channel 505, pressure gauge connection interface 506, mixing chamber 507, annular mixing channel 508, first digital display pressure gauge 509, second digital display pressure gauge 6, second one-way valve 7, gas flow meter 8, pressure reducing valve 9, booster pump 10, third outlet valve 1001, water and oil removal tank 11, second outlet valve 1101. DETAILED DESCRIPTION OF THE INVENTION

[0037] The following will clearly and completely describe the technical solutions in this invention patent in combination with the accompanying drawings in this invention patent. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, so they are only examples and cannot be used to limit the protection scope of the present invention.

[0038] Embodiment 1

[0039] A production system for continuously mixing and producing a pressurized air foam micro-structure provided in this embodiment includes a liquid storage tank 1. The liquid storage tank is connected to a plunger pump 2 through a pipeline, and the plunger pump 2 is connected to a gas-liquid mixer 5 through a pipeline; the gas-liquid mixer 5 is connected to a booster pump 10 through a pipeline, and the booster pump 10 is communicated with a water and oil removal tank 11 through a pipeline; the water and oil removal tank 11 is connected to an air compressor 4 through a pipeline.

[0040] A first one-way valve 3 is provided on the pipeline connecting the plunger pump 2 and the gas-liquid mixer 5 to prevent liquid backflow from damaging the plunger pump. The gas-liquid mixer 5 is also provided with a first digital display pressure gauge 509 to monitor the pressure in the mixing chamber.

[0041] On the pipeline connecting the gas-liquid mixer 5 and the booster pump 10, a second digital display pressure gauge 6 for monitoring the gas path inlet pressure, a second one-way valve 7 for preventing gas backflow, a gas flow meter 8, and a pressure reducing valve 9 are successively provided.

[0042] A first outlet valve 401 is provided on the air compressor 4, a third outlet valve 1001 is provided on the booster pump 10, and a second outlet valve 1101 is provided on the water and oil removal tank 11.

[0043] The gas-liquid mixer 5 includes a mixer main body 501. The upper end of the mixer main body 501 is provided with a pressure gauge connection interface 506 extending into the inner cavity of the mixer main body 501, the lower end is provided with a gas inlet channel 505 extending into the inner cavity of the mixer main body 501, the left end is provided with a liquid inlet channel 504 extending into the inner cavity of the mixer main body 501, and the right end is provided with an outlet channel 503 extending into the inner cavity of the mixer main body 501. The pressure gauge connection interface 506, the gas inlet channel 505, the liquid inlet channel 504, and the outlet channel 503 are all connected to the mixing chamber 507 through pipelines.

[0044] An annular mixing channel 508 is further provided on the pipeline between the outlet channel 503 and the mixing chamber 507 to prevent the gas inlet channel from being blocked due to the rotational displacement of the spacer. The annular mixing channel 508 is communicated with the gas inlet channel 505, and the outlet of the annular mixing channel 508 is communicated with the mixing chamber 507;

[0045] One end of the described outlet channel 503 located inside the mixer body 501 is also connected with a mixing chamber outlet connecting pipe 502, and the mixing chamber outlet connecting part 502 is fixedly connected with the outer surface of the annular mixing channel 508.

[0046] A digital display pressure gauge 509 for monitoring the pressure inside the mixing chamber is connected to the described pressure gauge interface 506; the outlet channel 503 communicates with an external pipeline.

[0047] Example 2

[0048] The production of a pressurized air foam with a fine structure in continuous mixing provided in this example adopts the production system for a pressurized air foam with a fine structure in continuous mixing provided in Example 1, and specifically includes the following steps:

[0049] First step: Turn on the air compressor 4, the first outlet valve 401 of the air compressor 4, and the second outlet valve 1101 of the water and oil removal tank 11. When the internal pressure of the booster pump 10 reaches 2 - 3 MPa, turn on the third outlet valve 1001 of the booster pump 10. During this process, the pressure at the outlet of the air compressor 4 should be stable at 0.4 - 0.8 MPa;

[0050] Second step: Adjust the pressure reducing valve 9 to adjust the pressure to 0.5 MPa within the pressure resistance range of the gas flowmeter, and control the gas flow rate at 0.4 m 3 / h through the gas flowmeter;

[0051] Third step: Continuously supply compressed air to the gas - liquid mixer 5. After being processed by the water and oil removal tank 11, the water content of the compressed air is ≤ 50 ppm;

[0052] Fourth step: Mix Class A foam extinguishing agent and water according to a mass ratio of 3:97 to obtain a foam solution with a mass fraction of Class A foam extinguishing agent of 3%, and store it in the liquid storage tank 1;

[0053] Fifth step: Set the liquid flow rate, start the plunger pump (2), and transport the foam solution prepared in the fourth step at a flow rate of 20 ml / min;

[0054] Sixth step: By adjusting the plunger pump (2) and the pressure reducing valve (9), under the condition of maintaining a gas - liquid volume ratio of 1:50 - 1:150, use the pressure gauge 4 connected to the upper interface of the gas - liquid mixer 5 to monitor the pressure inside the mixing chamber in real - time. When the pressure inside the mixing chamber reaches 0.25 MPa, compressed air foam with uniform particle size can be generated. The minimum particle size can reach 600 ± 50 nm, and the average particle size can reach 10.1 ± 0.5 μm. The foam particle size is uniform. For the physical diagram, refer to Figure 4 , and for the particle size, refer to Figure 5 .

[0055] Example 3

[0056] The production of a continuous mixed production of pressurized air foam microstructure provided by this embodiment adopts a production system for continuous mixed production of pressurized air foam microstructure provided by Embodiment 1, and specifically includes the following steps:

[0057] First step: Turn on the air compressor 4, the first outlet valve 401 of the air compressor 4, and the second outlet valve 1101 of the water and oil removal tank 11. When the internal pressure of the booster pump 10 reaches 2 - 3 MPa, open the third outlet valve 1001 of the booster pump 10. During this process, the pressure at the outlet of the air compressor 4 should be stabilized at 0.4 - 0.8 MPa;

[0058] Second step: Adjust the pressure reducing valve 9 to adjust the pressure to the pressure resistance of the gas flowmeter, which is 0.3 MPa, and control the gas flow rate at 0.33 m 3 / h through the gas flowmeter;

[0059] Third step: Continuously supply compressed air to the gas - liquid mixer 5. After being treated by the water and oil removal tank 11, the water content of the compressed air is ≤50 ppm;

[0060] Fourth step: Mix Class A foam extinguishing agent and water in a mass ratio of 3:97 to obtain a foam solution with a mass fraction of Class A foam extinguishing agent of 3%, and store it in the liquid storage tank 1;

[0061] Fifth step: Set the liquid flow rate, start the plunger pump (2), and transport the foam solution with a mass fraction of Class A foam extinguishing agent of 3% at a flow rate of 20 ml / min;

[0062] Sixth step: Through the adjustment of the plunger pump (2) and the pressure reducing valve (9), under the condition of maintaining the gas - liquid ratio volume ratio of 1:50 - 1:150, the pressure in the mixing chamber is monitored in real time through the pressure gauge 4 connected to the upper interface of the gas - liquid mixer 5. When the pressure in the mixing chamber reaches 0.1 MPa, compressed air foam with uniform particle size can be generated. The minimum particle size can reach 850 ± 50 nm, and the average particle size can reach 15.1 ± 1.5 μmm. The foam particle size is uniform. For the physical diagram, refer to Figure 6 , and for the particle size, refer to Figure 7 .

[0063] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A system for continuously mixing and producing a pressurized liquid micro-structure, characterized in that, It includes a liquid storage tank (1), and the liquid storage tank (1) is connected to a plunger pump (2) through a pipeline. The plunger pump (2) is connected to a gas-liquid mixer (5) through a pipeline; the gas-liquid mixer (5) is connected to a booster pump (10) through a pipeline, and the booster pump (10) is communicated with a water and oil removal tank (11) through a pipeline; the water and oil removal tank (11) is connected to an air compressor (4) through a pipeline; The gas-liquid mixer (5) includes a mixer body (501). A mixing chamber (507) is provided inside the mixer body (501). A gas inlet channel (505) extending to the mixing chamber (507) is provided at the lower end of the mixer body (501). A liquid inlet channel (504) extending to the mixing chamber (507) is provided at the left end, and an outlet channel (503) extending to the mixing chamber (507) is provided at the right end; an annular mixing channel (508) is further provided between the outlet channel (503) and the mixing chamber (507). The annular mixing channel (508) is communicated with the gas inlet channel (505), and the outlet of the annular mixing channel (508) is communicated with the mixing chamber (507).

2. The system for continuously and mixedly producing a pressurized liquid micro-structure according to claim 1, wherein A first one-way valve (3) is provided on the pipeline connecting the plunger pump (2) and the gas-liquid mixer (5).

3. A system for continuously mixing and producing a pressurized liquid micro-structure according to claim 1, characterized in that, A second digital display pressure gauge (6), a second one-way valve (7), a gas flowmeter (8), and a pressure reducing valve (9) are successively provided on the pipeline connecting the gas-liquid mixer (5) and the booster pump (10).

4. A system for continuously mixing and producing a pressurized liquid micro-structure according to claim 1, characterized in that, A first outlet valve (401) is provided on the air compressor (4), a second outlet valve (1001) is provided on the booster pump (10), and a third outlet valve (1101) is provided on the water and oil removal tank (11).

5. A system for continuously mixing and producing a pressurized liquid micro-structure according to claim 1, characterized in that, A pressure gauge connection interface (506) extending to the mixing chamber (507) is further provided at the upper end of the mixer body (501), and a first digital display pressure gauge (509) is connected to the pressure gauge interface (506).

6. A system for continuously mixing and producing a pressurized liquid micro-structure according to claim 1, characterized in that, One end of the outlet channel (503) located inside the mixer body (501) is further connected with a mixing chamber outlet connecting pipe (2), and the mixing chamber outlet connecting part (2) is fixedly connected to the outer surface of the annular mixing channel (508); the outlet channel (503) is communicated with an external pipeline; and the gas inlet channel (505), the liquid inlet channel (504), and the outlet channel (503) are all communicated with the mixing chamber (507) through pipelines.

7. A system for continuously mixing and producing a pressurized liquid micro-structure according to claim 6, characterized in that, The diameters of the channels of the gas inlet channel (505), liquid inlet channel (504), outlet channel (503), and pressure gauge connection interface (506) are all 1.5 mm; the diameter of the mixing chamber (507) is 2.8 - 3.2 mm; the diameter of the mixing chamber outlet connecting pipe (2) is 0.5-1 mm.

8. A method for continuously mixing and producing a pressurized liquid micro-structure, characterized in that, Produced by the system for continuously mixing and producing pressurized liquid microstructures according to any one of claims 1-7.

9. A method for continuously mixing and producing a pressurized liquid micro-structure according to claim 8, characterized in that, Successively includes the following steps: S1: Turn on the air compressor (4), the first outlet valve (401) of the air compressor (4), and the third outlet valve (1101) of the water and oil removal tank (11). When the pressure inside the booster pump (10) reaches 2-3 MPa, turn on the second outlet valve (1001) of the booster pump (10). During this process, the pressure at the outlet of the air compressor (4) needs to be stabilized at 0.4-0.8 MPa; S2: Adjust the pressure reducing valve (9) to regulate the pressure to the pressure resistance range of the gas flowmeter, which is 0 - 1 MPa, and control the gas flow rate to be 0.2 - 0.6 m 3 / h; S3: Continuously supply compressed gas to the gas-liquid mixer (5), and the water content of the compressed gas after being treated by the water and oil removal tank (11) is ≤ 50 ppm; S4: Start the plunger pump (2) and deliver the liquid stored in the liquid storage tank (1) to the gas-liquid mixer (5) at a flow rate of 15 - 100 ml / min, with the liquid phase viscosity controlled at 20 - 200 mPa·s; S5: Under the condition of maintaining the gas-liquid volume ratio of 1:50 - 1:150, monitor the pressure in the mixing chamber in real time through the first digital display pressure gauge (509) connected to the upper interface of the gas-liquid mixer (5). When the pressure in the mixing chamber reaches 0.25 MPa, compressed gas foam with uniform particle size can be generated.

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