High-efficiency entrainment fluid mixing jet nozzle

Abstract

This utility model relates to a fluid nozzle, particularly a high-efficiency entrainment-type fluid mixing jet nozzle. It includes a nozzle body, characterized by a double-layer structure comprising an outer circular tube and a central guide cone arranged concentrically; both the outer circular tube and the central guide cone have ejector holes and baffles at their fluid outlet ends. The structure is simple and can be used not only for gas entrainment mixing but also for liquid entrainment mixing, such as the mixing of wastewater and pharmaceuticals, and acid-base neutralization in chemical processes, thus having a wide range of applications. The addition of ejector holes to the nozzle creates a vacuum region inside the ejector hole due to the high-speed flow of the fluid, allowing fluid from outside the nozzle to enter the nozzle, increasing the mixing performance and creating premixing within the tube. Experiments have verified that this structure significantly increases the mixing performance of the two fluids, improves the uniformity of mixing, effectively avoids flame root quenching, and ensures stable combustion.

Description

Technical Field

[0001] This utility model relates to a fluid nozzle, and more particularly to a nozzle that can efficiently entrain and uniformly mix multi-media fluids. Background Technology

[0002] In engineering applications, it is often necessary to mix two fluid media. In the absence of an external power source, improving the mixing degree and uniformity of the two fluids is particularly important. For example, in low-NOx combustion processes, flue gas is entrained into air or fuel for uniform mixing to achieve stable low-NOx combustion. The following problems exist in actual production: 1. Insufficient proportion of cigarette smoke makes it difficult to achieve a significant reduction in nitrogen oxides (generally 50-80 mg / m³). 3 ); 2. Uneven mixing of smoke from the cigarette with air and fuel causes quenching at the base of the flame, which cannot guarantee stable combustion and affects combustion effect and efficiency. Utility Model Content

[0003] This invention addresses the technical problems mentioned in the background section by providing a high-efficiency entrainment-type fluid mixing jet nozzle. The purpose of this invention is to solve the problems of insufficient mixing volume and uneven mixing.

[0004] To achieve the above technical objectives, the technical solution adopted by this utility model is: a high-efficiency entrainment fluid mixing jet nozzle, comprising a nozzle body, wherein the nozzle body has a double-layer structure, comprising an outer circular tube and a central guide cone arranged concentrically; both the outer circular tube and the central guide cone are provided with ejector holes and baffles at their fluid outlet ends.

[0005] As a preferred technical solution: the outer circular tube is a hollow straight cylindrical structure, and an outer ejector hole is provided on the inner side of its fluid outlet end along the circumferential direction, and an inwardly inclined outer baffle is provided on the outer ejector hole.

[0006] As a preferred technical solution: the central guide cone tube comprises three sections along its length, which are a small-diameter cylindrical tube, a conical tube, and a large-diameter cylindrical tube, respectively, from the fluid inlet end to the fluid outlet end.

[0007] As a preferred technical solution: a central ejector hole is provided on the outer side of the fluid outlet end of the central guide cone along the circumferential direction, and an outwardly inclined central baffle is provided on the central ejector hole.

[0008] As a preferred technical solution: the working medium fluid is contained within the interlayer between the outer circular tube and the central guide cone tube; the outer side of the outer circular tube and the inner side of the central guide cone tube are both entrained fluids; the outer baffle and the central baffle are both inclined towards the working medium fluid, with an inclination angle of 25-35°.

[0009] As a preferred technical solution, the ratio of the diameter of the central guide cone port to the diameter of the outer circular tube is 0.5-0.75.

[0010] As a preferred technical solution, the ratio of the length of the baffle to the spacing between adjacent baffles is 0.4-0.6.

[0011] As a preferred technical solution, the length of the nozzle body is 3-5 times the diameter of the nozzle tip.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model has a simple structure and can be used not only for the entrainment and mixing of gases, but also for the entrainment and mixing of liquids, such as the mixing of sewage and pharmaceuticals, and the neutralization of acids and bases in chemical processes, thus having a wide range of applications. 2. By adding an ejector hole to the nozzle, when the fluid passes through the nozzle, a vacuum area is formed inside the ejector hole due to the high speed of the fluid flow, allowing the fluid outside the nozzle to enter the nozzle, increasing the mixing performance of the fluid and forming premixing inside the tube. Experiments have verified that this structure greatly increases the mixing performance of the two fluids, improves the uniformity of mixing, effectively avoids the flame root quenching phenomenon, and ensures stable combustion. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the internal structure of this utility model.

[0015] Figure 3 This is a schematic diagram of the port structure of this utility model.

[0016] Figure 4 This is a partially enlarged view of the present invention.

[0017] Figure 5 This is a schematic diagram of the fluid flow direction in this utility model.

[0018] In the figure: outer circular tube 1, central guide cone tube 2, ejector hole 3, central ejector hole 3-1, outer ejector hole 3-2, baffle 4, central baffle 4-1, outer baffle 4-2, working medium fluid 5, and drawn medium fluid 6. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] See appendix Figure 1-4This utility model mainly utilizes the jet principle. By optimizing the nozzle structure and changing the jet shape under the same flow conditions, it optimizes the contact perimeter between the jet medium and the mixed medium, and selects the ratio of the contact perimeter to the nozzle area of ​​the jet medium to achieve two-stage entrainment and mixing. This improves the efficiency of mixing (entrainment amount) and the uniformity of mixing of the two fluids, thereby achieving a 2-3 times increase in entrainment amount and a 1-fold reduction in mixing time and stroke.

[0021] This high-efficiency entrainment-type fluid mixing jet nozzle includes a nozzle body. The nozzle body has a double-layer structure, including an outer circular tube 1 and a central guide cone 2 arranged concentrically. Both the outer circular tube 1 and the central guide cone 2 have ejector holes 3 and baffles 4 at their fluid outlet ends. The working medium fluid 5 is contained within the interlayer between the outer circular tube 1 and the central guide cone 2; the outer side of the outer circular tube 1 and the inner side of the central guide cone 2 are filled with the ejected fluid 6.

[0022] The nozzle body adopts a double-layer structure. This double-layer structure increases the ratio of nozzle circumference to nozzle area, thereby increasing the length of the contact edge between the two fluids at the nozzle and improving their mixing degree. The ratio of the diameter of the central guide cone 2 to the diameter of the outer circular pipe 1 is 0.5-0.75. That is, if the outer nozzle diameter is D and the central guide cone nozzle diameter is d, the diameter range of the central guide cone is 0.5D ≤ d ≤ 0.75D. The specific dimensions of the circular pipe diameter D can be set according to the actual flow rate on site. To better shape the working medium and control the flow state within the pipe, the nozzle length needs to be reasonably controlled. Preferably, the length of the nozzle body is 3-5 times the nozzle end diameter; that is, if the nozzle length is L, its length should be 3-5D.

[0023] In a preferred embodiment, the outer circular tube 1 is a hollow straight cylindrical structure, and an outer ejector hole 3-2 is provided on the inner side of its fluid outlet end along the circumferential direction. An inwardly inclined outer baffle 4-2 is provided on the outer ejector hole 3-2.

[0024] The central guide cone 2 comprises three sections along its length: a small-diameter cylindrical tube, a conical tube, and a large-diameter cylindrical tube, arranged sequentially from the fluid inlet end to the fluid outlet end. A central ejector hole 3-1 is provided on the outer side of the fluid outlet end of the central guide cone 2 along the circumferential direction, and an outwardly inclined central baffle 4-1 is provided on the central ejector hole 31.

[0025] The baffle 4 alters the fluid flow pattern, shaping the medium fluid into a toothed jet, increasing the radial component of the fluid, and thus enhancing the free turbulence of the two fluid streams, thereby increasing their mixing degree. Experiments have shown that the baffle 4 needs to be bent (i.e., tilted) towards the working fluid, with the angle controlled between 25-35°, ideally 30°. The ratio of the length of the baffle 4 to the spacing between adjacent baffles is 0.4-0.6. That is, if the length is B and the spacing between adjacent baffles is A, the mutual adhesion effect between the two fluid streams significantly affects the entrainment and mixing performance of the jet. When the two injection holes 3 are close together, the entrainment and mixing capacity between the fluids decreases; when the two holes are far apart, the space utilization decreases, and the entrainment and mixing capacity decreases simultaneously. Therefore, it is necessary to carefully control the size of the baffle 4. Experiments have verified that a B to A ratio between 0.4 and 0.6 can efficiently entrain and mix the fluid, with B = πD / 36, and the baffles are evenly distributed along the circumference. After the baffle 4 is bent inward, the remaining opening is used as the ejector hole 3, and the size of the ejector hole 3 is the same as that of the baffle 4. To prevent flow deviation, the size of the central baffle 4-1 on the central guide cone is consistent with the size of the outer baffle 4-2 on the outer circular pipe 1.

[0026] To ensure optimal mixing at this nozzle, the velocities of the working medium and the ejected fluid must be strictly controlled. For ease of explanation, the working medium velocity is set to V. 介质 The ejected fluid is set to V. 被引射 Define V 被引射 With V 介质 The ratio is the working velocity ratio, hereinafter referred to as the velocity ratio. When the velocity difference between the two fluids is too large, the velocity of the working medium fluid is much higher than that of the entrained fluid, causing the working medium fluid to expand rapidly and penetrate the entrained fluid. The mixing area is concentrated at the edge of the working medium fluid, and the downstream mixing length is significantly enhanced, resulting in untimely mixing. Conversely, if the velocity difference is too small, the interface between the two fluids is relatively stable, the exchange of momentum and mass is relatively slow, and the mixing efficiency will also decrease. Through experimental verification, controlling the velocity ratio between 0.3 and 0.7, and controlling the working medium fluid velocity range within 30 m / s ≤ V, is recommended. 介质 A velocity ≤50 m / s can rapidly promote the entrainment and mixing of the two working fluids, resulting in optimal mixing. For example, by controlling the velocity ratio to 0.5 and the working medium fluid velocity range to 50 m / s, it can mix 9 m³ of working fluid per second, with the ejected fluid velocity controlled at 25 m / s.

Claims

1. A high efficiency entrained fluid mixing jet nozzle comprising a nozzle body, characterised in that, The nozzle body is a double-layer structure, comprising an outer circular tube and a central flow-conducting cone tube arranged concentrically inside and outside; The fluid outlet ends of the outer circular tube and the central flow-conducting cone tube are provided with injection holes and baffles.

2. The high-efficiency entrained fluid mixing jet of claim 1, wherein, The outer circular tube is a hollow straight circular cylinder structure, and the inner side of the fluid outlet end thereof is provided with outer layer injection holes in the circumferential direction, and the outer layer injection holes are provided with outer layer baffles inclined inward.

3. The high-efficiency entrained fluid mixing jet of claim 1, wherein, The central flow-conducting cone tube comprises three sections along the length direction thereof, and the sections are a small-diameter circular tube, a conical tube and a large-diameter circular tube in sequence from the fluid inlet end to the fluid outlet end.

4. The high-efficiency entrained fluid mixing jet of claim 3, wherein, The outer side of the fluid outlet end of the central flow-conducting cone tube is provided with central injection holes in the circumferential direction, and the central injection holes are provided with central baffles inclined outward.

5. The high-efficiency entrained fluid mixing jet according to claim 2 or 4, wherein, The interlayer of the outer circular tube and the central flow-conducting cone tube is a working medium fluid; the outer side of the outer circular tube and the inner side of the central flow-conducting cone tube are both injected fluids; Both the outer layer baffles and the central baffles are inclined to the working medium fluid, and the inclination angle is 25-35°.

6. The high-efficiency entrained fluid mixing jet of claim 5, wherein, The ratio of the diameter of the central flow-conducting cone tube port to the diameter of the outer circular tube is 0.5-0.

75.

7. The high-efficiency entrained fluid mixing jet of claim 1, wherein, The ratio of the length of the baffle to the spacing of the adjacent baffles is 0.4-0.

6.

8. The high-efficiency entrained fluid mixing jet of claim 1, wherein, The length of the nozzle body is 3-5 times the diameter of the nozzle end.

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