Convection super-strong mixing venturi jet device and working method thereof

Abstract

The invention relates to the field of gas treatment equipment, in particular to a convection super-strong mixing venturi jet device and a working method thereof.The jet device comprises a fluid inflow straight pipe section, a contraction section, a throat pipe, an expansion section and a fluid outflow straight pipe section which are sequentially communicated in a sealed mode; the fluid inflow straight pipe section, the throat pipe and the fluid outflow straight pipe section are through pipe bodies, the contraction section is a through pipe body with the pipe diameter gradually decreasing from the connecting position of the contraction section and the fluid inflow straight pipe section, and the expansion section is a through pipe body with the pipe diameter gradually increasing from the connecting position of the expansion section and the throat pipe. The side face of the throat pipe is communicated with a suction pipe, and the included angle between the axis of the suction pipe and the end, close to the contraction section, of the axis of the throat pipe is an obtuse angle. The axis of the suction pipe and the axis of the end, close to the contraction section, of the throat pipe are designed to be the obtuse angle, so that liquid flowing into the Venturi jet device and fluid sucked into the Venturi jet device form convection impact, and the mixing efficiency of the fluid is improved.

Description

Technical Field

[0001] The invention relates to the field of gas processing equipment, and in particular to a venturi ejector for super-strong convection mixing and a working method thereof. Background Art

[0002] The Venturi ejector is based on the Venturi effect. It creates a low-pressure area by allowing the liquid to flow through the contraction section. The low-pressure area is used to suck in the external fluid (gas or liquid) and mix it with the main liquid. In industrial applications, the Venturi ejector can effectively mix gas and liquid or liquid and liquid, and is widely used in the fields of air pollution and waste gas treatment. In addition, the Venturi ejector can also be used in liquid delivery systems to achieve efficient non-powered delivery by draining the liquid.

[0003] In the prior art, L. Song et al. reported in the document “Ultra-high efficient hydrodynamic cavitation enhanced oxidation of nitric oxide with chlorine dioxide” a study on waste gas treatment using a venturi ejector as a cavitation reactor. The research results showed that when the exhaust gas was vertically inhaled through the venturi ejector suction pipe, when the oxidant concentration was high, a high concentration of pollutants remained in the treated gas due to insufficient mixing efficiency.

[0004] In summary, in order to solve the problem of insufficient mixing efficiency of liquid fluid in a Venturi ejector, the present invention proposes a Venturi ejector with super convective mixing and a working method thereof. Summary of the invention

[0005] According to the above technical problem that the liquid-fluid mixing efficiency of the Venturi ejector is insufficient, a Venturi ejector with super strong convection mixing and a working method thereof are provided, and the mixing efficiency between the fluid and the liquid is improved through structural improvement.

[0006] The technical means adopted by the present invention are as follows:

[0007] A venturi ejector for super strong convection mixing comprises a fluid inlet straight pipe section, a contraction section, a throat, an expansion section and a fluid outlet straight pipe section which are sealed and connected in sequence, wherein the fluid inlet straight pipe section, the throat and the fluid outlet straight pipe section are through pipe bodies respectively, the contraction section is a through pipe body whose pipe diameter gradually decreases from the connection with the fluid inlet straight pipe section, the expansion section is a through pipe body whose pipe diameter gradually increases from the connection with the throat, the side surface of the throat is connected with a suction pipe, and the angle between the axis of the suction pipe and the axis of the throat near one end of the contraction section is an obtuse angle.

[0008] The inner diameter of the suction pipe gradually decreases from the end thereof to the connection with the throat pipe, and the suction pipe presents a reduced tube shape.

[0009] The straight pipe section where the fluid flows in is provided with a first pressure sensor, and the straight pipe section where the fluid flows out is provided with a second pressure sensor.

[0010] At least two suction pipes are arranged in the middle of the throat pipe.

[0011] Each of the suction pipes is equipped with a stop valve, and a third pressure sensor is arranged on the suction pipe between the stop valve and the throat pipe.

[0012] A working method of a venturi ejector for super intense convection mixing comprises the following steps:

[0013] At the beginning of work, the stop valve on the suction pipe is closed;

[0014] The liquid enters the straight pipe section from the fluid inlet, then flows through the contraction section, throat, expansion section, and the fluid flows out of the straight pipe section;

[0015] When the liquid flows into the contraction section, the diameter of the channel through which the liquid flows gradually decreases, and the liquid flow rate gradually increases, forming a low pressure at the throat, which leads to suction at the suction pipe.

[0016] The first pressure sensor and the second pressure sensor are started. When the pressure difference between the first pressure sensor and the second pressure sensor is greater than a preset threshold, the stop valve on the suction pipe is opened to suck the fluid to be sucked into the throat pipe, so that the fluid and the liquid form a certain convection impact;

[0017] The mixed fluid flows into the expansion section, the fluid channel diameter gradually increases, the fluid flow rate decreases, and the pressure in the expansion section increases, thereby forming cavitation and further promoting mixing between fluids.

[0018] The preset threshold value of the pressure difference is between 2 atmospheres and 4 atmospheres.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. The venturi ejector for super strong convection mixing provided by the present invention has an obtuse angle between the axis of the suction pipe and the axis of the throat pipe near one end of the contraction section, so that the liquid flowing into the venturi ejector and the fluid (gas or liquid) sucked into the venturi ejector form a convection impact, thereby improving the mixing efficiency between the fluids. The suction pipe in the shape of a tapered circular tube can increase the flow rate of the sucked fluid, further promoting the mass transfer efficiency between the fluids.

[0021] 2. In the present invention, a stop valve is arranged at the suction pipe to prevent the liquid from accidentally flowing out of the suction pipe, thereby improving the safety of the equipment.

[0022] 3. In the present invention, pressure sensors are arranged at both ends of the Venturi ejector and at the suction pipe to display the inlet pressure, outlet pressure and suction pressure in real time, so as to better estimate the occurrence intensity of cavitation and more accurately grasp the working status of the equipment.

[0023] Based on the above reasons, the present invention can be widely promoted in the fields of gas processing equipment and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 The figure is a schematic diagram of the structure of a venturi ejector for super intense convection mixing according to the present invention.

[0026] Figure 2 The figure is a schematic diagram of the top view of the structure of a venturi ejector for super intense convective mixing according to the present invention.

[0027] In the figure: 1. Fluid flows into the straight pipe section; 2. Contraction section; 3. Throat; 4. Expansion section; 5. Fluid flows out of the straight pipe section; 6. Suction pipe; 7. First pressure sensor; 8. Second pressure sensor; 9. Stop valve; 10. Third pressure sensor. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] like Figure 1 and Figure 2 As shown, the present invention provides a venturi ejector for super strong convection mixing, comprising a fluid inlet straight pipe section 1, a contraction section 2, a throat 3, an expansion section 4, and a fluid outlet straight pipe section 5 which are sealed and connected in sequence, the fluid inlet straight pipe section 1, the throat 3 and the fluid outlet straight pipe section 5 are through pipe bodies respectively, the contraction section 2 is a through pipe body whose diameter gradually decreases from the connection with the fluid inlet straight pipe section 1, the expansion section 4 is a through pipe body whose diameter gradually increases from the connection with the throat 3, the side of the throat 3 is connected with the suction pipe 6, and the angle between the axis of the suction pipe 6 and the axis of the throat 3 near the end of the contraction section 2 is an obtuse angle, so that the liquid flowing into the venturi ejector and the fluid (gas or liquid) sucked into the venturi ejector form a convection impact, thereby improving the mixing efficiency between the fluids.

[0031] The inner diameter of the suction pipe 6 gradually decreases from its end to the connection with the throat pipe 3. The suction pipe 6 presents a reduced tube shape, which can increase the flow rate of the suction fluid, thereby forming a super strong mixing between the fluids, further promoting the mass transfer efficiency between the fluids.

[0032] A first pressure sensor 7 is provided for the fluid inflow straight pipe section 1, and a second pressure sensor 8 is provided for the fluid outflow straight pipe section 5, so as to display the inlet pressure and the outlet pressure in real time, so as to better estimate the occurrence intensity of cavitation and more accurately grasp the working state of the equipment.

[0033] At least two suction pipes 6 are arranged in the middle of the throat pipe 3 .

[0034] Each suction pipe 6 is provided with a stop valve 9 to prevent liquid from flowing out of the suction pipe 6 by mistake, thereby improving the safety of the equipment. A third pressure sensor 10 is provided on the suction pipe 6 between the stop valve 9 and the throat pipe 3 to display the suction pressure in real time.

[0035] The present invention also provides a working method of a venturi ejector for super intense convection mixing, comprising the following steps:

[0036] At the beginning of the operation, the stop valve 9 on the suction pipe 6 is in a closed state to prevent the liquid from flowing out of the suction pipe 6 directly, thereby improving the safety of the equipment;

[0037] The liquid enters from the fluid inlet straight pipe section 1, and then flows through the contraction section 2, the throat 3, the expansion section 4, and the straight pipe section 5 in sequence;

[0038] When the liquid flows into the contraction section 2, the diameter of the channel through which the liquid flows gradually decreases, and the liquid flow rate gradually increases, forming a low pressure at the throat 3, thereby causing suction at the suction pipe 6;

[0039] Start the first pressure sensor 7 and the second pressure sensor 8. When the pressure difference between the first pressure sensor 7 and the second pressure sensor 8 is greater than a preset threshold (between 2 atmospheres and 4 atmospheres), open the stop valve 9 on the suction pipe 6 to suck the fluid to be sucked into the throat pipe 3, so that the fluid and the liquid form a certain convection impact, so that the fluids are mixed more fully;

[0040] The mixed fluid flows into the expansion section 4, the channel diameter of the fluid gradually increases, the fluid flow rate decreases, and the pressure in the expansion section 4 increases, thereby forming cavitation, further promoting the mixing of the fluids. The active free radicals formed by cavitation will also promote the mutual reaction of various substances in the fluid.

[0041] In specific implementation, as a preferred embodiment of the present invention, the substance that flows into the venturi ejector from the fluid flowing into the straight pipe section 1 is liquid, and the substance that enters the venturi ejector from the suction pipe 6 is fluid.

[0042] In specific implementation, as a preferred embodiment of the present invention, the first pressure sensor 7 is arranged in the middle of the straight pipe section 1 where the fluid flows in, the second pressure sensor 8 is arranged in the middle of the straight pipe section 5 where the fluid flows out, the stop valve 9 is arranged in the middle of the suction pipe 6, and the third pressure sensor 10 is arranged on the suction pipe 6 between the stop valve 9 and the throat 3.

[0043] In specific implementation, as a preferred embodiment of the present invention, the angle between the axis of the suction pipe 6 and the axis of the throat pipe 3 near the end of the contraction section 2 is an obtuse angle, wherein the effect is better when the obtuse angle is greater than 90 degrees and less than 120 degrees.

[0044] In specific implementation, as a preferred embodiment of the present invention, the diameters of the straight pipe section 1 for fluid to flow into, the throat 3 and the straight pipe section 5 for fluid to flow out can be changed and can be pipes of any shape.

[0045] During specific implementation, as a preferred embodiment of the present invention, all pressure sensors are of RS485 model.

[0046] In the specific implementation, as the preferred embodiment of the present invention, all stop valves are 4-point 304 stainless steel gate valves.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A venturi ejector for super strong convection mixing, characterized in that: The invention comprises a fluid inlet straight pipe section (1), a contraction section (2), a throat pipe (3), an expansion section (4), and a fluid outlet straight pipe section (5) which are sealed and connected in sequence. The fluid inlet straight pipe section (1), the throat pipe (3), and the fluid outlet straight pipe section (5) are through pipe bodies respectively. The contraction section (2) is a through pipe body whose diameter gradually decreases from the connection with the fluid inlet straight pipe section (1). The expansion section (4) is a through pipe body whose diameter gradually increases from the connection with the throat pipe (3). The side surface of the throat pipe (3) is connected with a suction pipe (6). The angle between the axis of the suction pipe (6) and the axis of the throat pipe (3) close to one end of the contraction section (2) is an obtuse angle.

2. The venturi ejector for super intense convection mixing according to claim 1, characterized in that: The inner diameter of the suction pipe (6) gradually decreases from its end to the connection with the throat pipe (3), and the suction pipe (6) presents a reduced tube shape.

3. The venturi ejector for convective super mixing according to claim 1, characterized in that: The straight pipe section (1) through which the fluid flows in is provided with a first pressure sensor (7), and the straight pipe section (5) through which the fluid flows out is provided with a second pressure sensor (8).

4. The venturi ejector for convective super mixing according to claim 1, characterized in that: At least two suction pipes (6) are arranged in the middle of the throat pipe (3).

5. The venturi ejector for convective super mixing according to claim 4, characterized in that: Each of the suction pipes (6) is equipped with a stop valve (9), and a third pressure sensor (10) is arranged on the suction pipe (6) between the stop valve (9) and the throat pipe (3).

6. A method for operating a venturi ejector for super intense convective mixing, based on the venturi ejector according to any one of claims 1 to 5, characterized in that: The following steps are involved: When the operation starts, the stop valve (9) on the suction pipe (6) is in a closed state; The liquid enters the fluid inlet straight pipe section (1), then flows through the contraction section (2), the throat (3), the expansion section (4), and then flows out of the fluid straight pipe section (5); When the liquid flows into the contraction section (2), the diameter of the channel through which the liquid flows gradually decreases, the liquid flow rate gradually increases, and a low pressure is formed at the throat (3), thereby causing suction to be generated at the suction pipe (6); The first pressure sensor (7) and the second pressure sensor (8) are started, and when the pressure difference between the first pressure sensor (7) and the second pressure sensor (8) is greater than a preset threshold value, the stop valve (9) on the suction pipe (6) is opened to suck the fluid to be sucked into the throat pipe (3), so that the fluid and the liquid form a certain convection impact; The mixed fluid flows into the expansion section (4), the fluid channel diameter gradually increases, the fluid flow rate decreases, and the pressure in the expansion section (4) increases, thereby forming a cavitation phenomenon, further promoting the mixing of the fluids.

7. The working method of a venturi ejector for super intense convection mixing according to claim 6, characterized in that: The preset threshold value of the pressure difference is between 2 atmospheres and 4 atmospheres.

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