A bubble atomizing nozzle based on multi-channel series venturi bubble generation

Abstract

The application discloses a bubble atomizing nozzle based on multi-channel series Venturi pipe bubble formation, which comprises a pipe body with a liquid fuel channel inside, a front end of the pipe body being connected with a spray head and provided with a multi-channel series Venturi structure, the multi-channel series Venturi structure comprising a plurality of annularly arrayed and uniformly distributed Venturi channels, the Venturi channel comprising a plurality of series-connected Venturi cavities, the liquid fuel entering the inlet of each Venturi cavity respectively, the series-connected Venturi cavities and the vertically-entering atomizing gas being used for multiple mixing, shearing, foaming and breaking, so as to form a gas-liquid two-phase flow rich in micro-bubbles, finally forming a stable bubble-shaped two-phase flow with uniform and dense bubble distribution in the mixing chamber of the spray head, and being sprayed out from the spray hole to form a liquid mist. The application effectively enhances the uniformity of gas-liquid two-phase mixing and the density of bubbles in the bubble atomizing process, and significantly improves the atomizing effect of fuel oil.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid fuel atomization, in particular to a bubble atomization nozzle based on multi-channel series Venturi tube bubble formation. BACKGROUND

[0002] The combustion of liquid fuel generally needs to use a nozzle, which functions to atomize the liquid fuel, form liquid droplets with small particle sizes, increase the contact area and mixing intensity of the fuel and the oxidant, and thus achieve the purpose of rapid evaporation, mixing and combustion. The atomization nozzle is one of the key components in a combustion power equipment, and the performance of the nozzle will directly affect fuel ignition, combustion stability, burnout rate, and pollutant emission, etc. Therefore, the design of a high-efficiency atomization nozzle provides an important guarantee for the full and stable combustion of liquid fuel.

[0003] The bubble atomization nozzle technology is to pass atomization gas into liquid, form a bubble group in the nozzle, and uniformly disperse in the liquid phase, and then the bubble two-phase flow is sprayed out through the spray hole, and very fine liquid mist is generated by using the bursting effect of the bubbles. The bubble atomization nozzle has low gas consumption and high atomization quality, and is more suitable for atomizing high-viscosity liquid fuels such as heavy oil and residual oil. The bubble density and uniformity of the gas-liquid two-phase mixing process in the bubble atomization nozzle are the key to determining the atomization effect. The existing bubble atomization nozzles generally have problems such as few bubbles or too large bubbles, which leads to poor atomization effect and insufficient combustion of fuel. SUMMARY

[0004] In view of the above technical deficiencies, the purpose of the present application is to provide a bubble atomization nozzle based on multi-channel series Venturi tube bubble formation, which aims to solve the problem of insufficient combustion caused by few bubbles or too large bubbles in the gas-liquid two-phase mixing process in the existing bubble atomization nozzle.

[0005] To solve the above technical problems, the present application adopts the following technical solutions:

[0006] The present application provides a bubble atomization nozzle based on multi-channel series Venturi tube bubble formation, comprising a pipe body provided with a liquid fuel channel inside, the front end of the pipe body is connected to a spray head and is provided with a multi-channel series Venturi structure;

[0007] The rear end of the multi-channel series Venturi structure is communicated with the liquid fuel channel, and the front end of the multi-channel series Venturi structure is communicated with the inner cavity of the spray head and forms a mixing chamber with the inner cavity of the spray head;

[0008] The multi-channel series Venturi structure comprises a plurality of Venturi channels arranged in a ring array and uniformly distributed, and the Venturi channel comprises a plurality of Venturi cavities connected in series;

[0009] The liquid fuel channel is provided with a center atomizing gas pipeline coaxially arranged with the liquid fuel channel, and the rear end of the center atomizing gas pipeline penetrates out of the pipe body and is connected with a center atomizing gas joint matched therewith.

[0010] The front end of the center atomizing gas pipeline is provided with a plurality of center atomizing gas nozzles in communication with the inlets of the respective venturi cavities.

[0011] The pipe body is further provided with an outer ring channel at the periphery of the liquid fuel channel, and each inlet of the venturi cavities is in communication with an outer ring atomizing gas flow channel, and the other end of the outer ring atomizing gas flow channel is in communication with the outer ring channel.

[0012] The side wall of the pipe body is provided with an outer ring atomizing gas joint in communication with the outer ring channel and a liquid fuel joint in communication with the liquid fuel channel, and the spray head is provided with a plurality of spray holes in communication with the mixing chamber.

[0013] Preferably, the number of the venturi channels is 3-10, and the number of the venturi cavities in the venturi channels is at least two.

[0014] Preferably, the throat diameters of the respective venturi cavities in the venturi channels decrease from the rear to the front.

[0015] Preferably, the connection between the spray head and the front end of the pipe body is screw connection, bolt fixation or welding fixation.

[0016] Preferably, the spray holes provided at the front end of the spray head are arranged in a ring array.

[0017] The present application has the following beneficial effects:

[0018] 1. The present application uses the array structure of the series-connected venturi cavities to form a multi-channel gas-liquid two-phase mixing and foaming path, which improves the bubble density and uniformity of the gas-liquid two-phase mixing process in the atomization process, thereby improving the atomization effect.

[0019] 2. The liquid fuel enters the respective venturi cavities along the liquid fuel channel, and is mixed, sheared, foamed and broken multiple times with the atomizing gas entering vertically along the outer ring atomizing gas flow channel and the center atomizing gas pipeline, to form a gas-liquid two-phase flow rich in micro-bubbles, and finally form a stable bubble-shaped two-phase flow with uniform and dense bubble distribution in the mixing chamber of the spray head, and then sprayed out from the spray holes to form a liquid mist. The multi-stage venturi cavity structure strengthens the deformation and breaking of the bubbles in the gas-liquid two-phase mixing process, improves the density and uniformity of the bubble group, and significantly improves the atomization effect of the fuel. BRIEF DESCRIPTION OF DRAWINGS

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Fig. 1 This is a schematic diagram of the structure of a bubble atomizing nozzle based on multi-channel series Venturi tubes for bubble formation, provided in an embodiment of the present invention.

[0022] Fig. 2 This is an internal cross-sectional view of a bubble atomizing nozzle based on multi-channel tandem venturi tubes, provided as an embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1-Nozzle, 2-Spray hole, 3-Mixing chamber, 4-Pipe body, 5-Venturi cavity, 6-Outer ring channel, 7-Central atomizing gas nozzle, 9-Outer ring atomizing gas nozzle, 11-Outer ring atomizing gas flow channel, 14-Liquid fuel channel, 15-Central atomizing gas pipeline, 16-Outer ring atomizing gas connector, 17-Central atomizing gas connector, 18-Liquid fuel connector. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] like Figs. 1-2 As shown, this embodiment provides a bubble atomizing nozzle based on multi-channel series Venturi tube bubble formation, including a tube body 4 with a liquid fuel channel 14 inside, the front end of the tube body 4 is threadedly connected to the nozzle 1 and is provided with a multi-channel series Venturi structure.

[0027] The rear end of the multi-channel tandem Venturi structure is connected to the liquid fuel channel 14, and the front end of the multi-channel tandem Venturi structure is connected to the inner cavity of the nozzle 1 and forms a mixing chamber 3 therewith.

[0028] The multi-channel tandem Venturi structure includes four Venturi channels, each of which includes two Venturi cavities 5 connected in series. From back to front, they are divided into a primary Venturi cavity and a secondary Venturi cavity; the diameter of the trachea of ​​the secondary Venturi cavity is smaller than that of the trachea of ​​the primary Venturi cavity.

[0029] The liquid fuel passage 14 is provided with a center atomizing gas pipe 15 coaxially arranged therein, a rear end of the center atomizing gas pipe 15 extending out of the pipe body 4 and connected with a center atomizing gas joint 17 matched therewith;

[0030] A front end of the center atomizing gas pipe 15 is provided with four center atomizing gas nozzles 7 vertically distributed in a circle and communicated with the inlet of the primary Venturi cavity and four center atomizing gas nozzles 7 vertically distributed in a circle and communicated with the inlet of the secondary Venturi cavity.

[0031] The pipe body 4 is further provided with an outer ring passage 6 at the periphery of the liquid fuel passage 14, and each of the inlets of the Venturi cavities 5 is communicated with an outer ring atomizing gas flow channel 11 through an outer ring atomizing gas nozzle 9, and the other end of the outer ring atomizing gas flow channel 11 is communicated with the outer ring passage 6.

[0032] The pipe body 4 is provided with an outer ring atomizing gas joint 16 communicated with the outer ring passage 6 and a liquid fuel joint 18 communicated with the liquid fuel passage 14, and the spray head 1 is provided with eight spray holes 2 arranged in a ring array and communicated with the mixing chamber 3.

[0033] The working process of the bubble atomizing nozzle based on the multi-channel series Venturi pipe bubble formation is as follows:

[0034] The atomizing gas entering the center atomizing gas pipe 15 from the center atomizing gas joint 17 is partially sprayed out of the four center atomizing gas nozzles 7 at the rear end to form a center primary atomizing gas flow to the inlet of the primary Venturi cavity, and the other part is sprayed out of the four center atomizing gas nozzles 7 at the front end to form a center secondary atomizing gas flow to the inlet of the secondary Venturi cavity; the atomizing gas entering the outer ring passage 6 from the outer ring atomizing gas joint 16 respectively enters each Venturi passage through two outer ring atomizing gas flow channels 11, in each Venturi passage, one stream of atomizing gas enters the primary Venturi cavity inlet along one of the outer ring atomizing gas flow channels 11 to form an outer ring primary atomizing gas flow, and the other stream of atomizing gas enters the secondary Venturi cavity inlet along the other outer ring atomizing gas flow channel 11 to form an outer ring secondary atomizing gas flow; the fuel entering the liquid fuel passage 14 from the liquid fuel joint 18 is divided into four streams and respectively enters the primary Venturi cavities of the four Venturi passages.

[0035] The gas-liquid mixing and foaming process in the four Venturi channels is the same as the process of foaming. Here, only one Venturi channel is taken as an example. The liquid entering the first-stage Venturi cavity from the first-stage Venturi cavity inlet mixes with the central primary atomizing gas flow and the outer ring primary atomizing gas flow in the first-stage Venturi cavity, and forms a two-phase flow containing bubbles with the generation and breakage of bubbles. Then, after mixing and colliding with the central secondary atomizing gas flow and the outer ring secondary atomizing gas flow at the second-stage Venturi cavity inlet, the two-phase flow enters the second-stage Venturi cavity to further undergo shearing and breakage, and forms a gas-liquid two-phase flow rich in micro-bubbles. Finally, the four two-phase mixtures further mix in the mixing chamber 3 to form a stable bubble-shaped two-phase flow with uniform and dense bubbles, and are sprayed out of the spray hole 2 at a high speed to realize high-quality atomization of the liquid.

[0036] Obviously, various modifications and changes can be made to the present application by those skilled in the art without departing from the spirit and scope of the present application. Accordingly, it is intended that the present application embrace all such modifications and changes as fall within the scope of the claims and their equivalents.

Claims

1. A bubble atomizing nozzle based on multi-channel series Venturi bubble formation, characterized by: The pipe body (4) is internally provided with a liquid fuel channel (14), the front end of the pipe body (4) is connected with a spray head (1) and is provided with a multi-channel series Venturi structure; The rear end of the multi-channel series Venturi structure is communicated with the liquid fuel channel (14), and the front end of the multi-channel series Venturi structure is communicated with the inner cavity of the spray head (1) and forms a mixing chamber (3) with the inner cavity. The multi-channel series Venturi structure comprises a plurality of Venturi channels arranged in a ring array. The liquid fuel channel (14) is internally provided with a center atomizing gas pipeline (15) arranged in the same axis, the rear end of the center atomizing gas pipeline (15) penetrates out of the pipe body (4) and is connected with a center atomizing gas joint (17) matched therewith. The front end of the center atomizing gas pipeline (15) is provided with a plurality of center atomizing gas nozzles (7) respectively communicated with the inlets of the Venturi cavities (5). The pipe body (4) is further provided with an outer ring channel (6) at the periphery of the liquid fuel channel (14), and the inlet of each Venturi cavity (5) is communicated with an outer ring atomizing gas flow channel (11), and the other end of the outer ring atomizing gas flow channel (11) is communicated with the outer ring channel (6). The side wall of the pipe body (4) is provided with an outer ring atomizing gas joint (16) communicated with the outer ring channel (6) and a liquid fuel joint (18) communicated with the liquid fuel channel (14), and the spray head (1) is provided with a plurality of spray holes (2) communicated with the mixing chamber (3).

2. A bubble atomizing nozzle based on multi-channel series Venturi tube bubble generation according to claim 1, characterized in that, The number of the Venturi channels is 3-10, and the number of the Venturi cavities (5) in the Venturi channels is at least two.

3. A bubble atomizing nozzle based on multi-channel series Venturi tube bubble generation according to claim 1, characterized in that, The throat diameters of the Venturi cavities (5) in the Venturi channels gradually decrease from the rear to the front.

4. A bubble atomizing nozzle based on multi-channel series Venturi tube bubble generation according to claim 1, characterized in that, The connection mode of the spray head (1) and the front end of the pipe body (4) is screw connection, bolt fixation or welding fixation.

5. A bubble atomizing nozzle based on multi-channel series Venturi tube bubble generation according to claim 1, characterized in that: The spray holes (2) provided at the front end of the spray head (1) are arranged in a ring array.

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