A foaming bubble atomizing nozzle suitable for a wide range of viscosity fuels

Abstract

The application discloses a foaming bubble atomizing nozzle suitable for wide-range viscosity fuel, which comprises a spray head, a foaming mesh structure, a second mixing cavity, a foaming steam passage structure, a sprayer, a fuel oil pipe and a steam sleeve. The spray head is located at the front end of the atomizing nozzle, and a plurality of spray holes are uniformly distributed on the end face of the spray head. The second mixing cavity is located at the middle part of the atomizing nozzle, the front end of the second mixing cavity is connected with the spray head, and the connecting part is provided with the foaming mesh structure; the tail end of the second mixing cavity is connected with the steam sleeve, the connecting part is provided with the foaming steam passage structure, and the sprayer is arranged on the foaming steam passage structure. The fuel oil pipe is coaxially arranged with the steam sleeve, the front end of the fuel oil pipe is provided with an oil injection hole, and the first mixing cavity is formed between the front end of the fuel oil pipe and the sprayer. The foaming mesh structure is used to improve the uniformity and stability of the bubble two-phase flow in the fuel bubble atomization process, and the problems of insufficient atomization and unevenness of the wide-range viscosity fuel are effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid atomizing nozzle, in particular to a foaming bubble atomizing nozzle suitable for wide range of viscosity fuel. BACKGROUND

[0002] Liquid fuel atomization problems exist widely in life and industrial production, such as catalytic slurry oil, coal water slurry, heavy oil, tar combustion, etc. Such liquid fuel has large viscosity and surface tension, large breaking distance and breaking particle size, and slow breaking rate, and poor flow and atomization characteristics. For liquid fuel such as catalytic slurry oil, the main function of the nozzle is to atomize the fuel to form fine droplets, so as to quickly complete the processes of evaporation, pyrolysis, mixing, ignition and combustion. The atomization performance of the fuel directly affects the ignition, combustion stability, combustion efficiency and pollutant generation performance in the combustion equipment.

[0003] At present, high-pressure steam atomizing nozzles are widely used in industrial furnace and boiler combustion equipment for burning catalytic slurry oil and other fuels, as well as in liquid and solution spraying devices of non-combustion equipment. Since the catalytic slurry oil contains catalyst and other solid particles, the liquid viscosity is high and wide, the existing nozzles are easy to be blocked, the atomization flow field is uneven, the atomization effect is poor, and the nozzle cannot well adapt to the wide range of fuel viscosity changes, affecting the continuous and stable operation of the device. SUMMARY

[0004] In view of the above technical deficiencies, the purpose of the present application is to provide a foaming bubble atomizing nozzle suitable for wide range of viscosity fuel, which aims to solve the problems of poor atomization effect of the existing nozzle for wide range of viscosity fuel, easy to be blocked, and cannot well adapt to the wide range of fuel viscosity changes.

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

[0006] The present application provides a foaming bubble atomizing nozzle suitable for wide range of viscosity fuel, comprising a nozzle, a mixing sleeve and a steam sleeve connected in sequence from front to back;

[0007] The mixing sleeve is provided with a foaming mesh structure at the front end connected to the nozzle, and the nozzle is provided with a plurality of evenly distributed spray holes, and a foaming chamber is formed between the inner cavity of the nozzle and the foaming mesh structure;

[0008] The mixing sleeve is provided with a foaming steam passage structure at the rear end connected to the steam sleeve, and the foaming steam passage structure is provided with a sprayer on the side close to the mixing sleeve;

[0009] The inner cavity of the steam sleeve is provided with a fuel oil pipe coaxially arranged therewith, and a steam passage is formed between the outer wall of the fuel oil pipe and the inner wall of the steam sleeve;

[0010] The rear end of the fuel oil pipe extends out of the steam jacket and is connected with a wide-range viscosity fuel joint; the front end of the fuel oil pipe is connected with the first mixing cavity formed between the foaming steam passage structure and the inner cavity of the sprayer.

[0011] The front end of the fuel oil pipe is provided with a plurality of oil injection holes connected with the first mixing cavity.

[0012] The second mixing cavity is formed between the inner wall of the mixing jacket and the outer wall of the sprayer, the foaming steam passage structure is provided with a plurality of foaming steam injection holes connected with the second mixing cavity and the steam passage and a plurality of pneumatic atomization steam passages connected with the first mixing cavity and the steam passage.

[0013] The steam jacket is provided with an atomization steam joint connected with the steam passage.

[0014] Preferably, the foaming steam injection holes are cylindrical passages or tapered passages and are uniformly distributed on the foaming steam passage structure in the circumferential direction.

[0015] Preferably, the sprayer is provided with atomization spray holes for uniformly atomizing and spraying the gas-liquid two-phase mixture into the second mixing cavity.

[0016] Preferably, the foaming mesh structure is a perforated plate structure, the perforated plate structure is provided with a plurality of foaming mesh holes, the shape of the foaming mesh holes includes a circle, a triangle, an ellipse, a rectangle and a trapezoid, and the area of the foaming mesh hole inlet is larger than the area of the foaming mesh hole outlet.

[0017] Preferably, the foaming mesh structure is a metal wire mesh or a porous material and has one or more layers.

[0018] Preferably, the number of the spray holes is 4-12, the diameter of the spray holes is 1-10 mm, and the included angle between the center line of the spray holes and the central axis of the entire nozzle is 10°-80°.

[0019] The present application has the following beneficial effects:

[0020] The foaming bubble atomizing nozzle of the present application is suitable for atomizing combustion of fuel with wide range of viscosity, high pressure steam enters from the steam channel, a part of the steam flows through the pneumatic atomizing steam channel and collides, shears and atomizes with the oil column sprayed from the oil injection hole, then enters the first mixing chamber and forms gas-liquid two-phase flow, then the gas-liquid two-phase mixture is uniformly sprayed to the second mixing chamber through the sprayer, the secondary atomization is completed and stable bubble two-phase flow is formed; the other part of the steam enters the second mixing chamber through the foaming steam injection hole, shears and extrudes with the above-mentioned bubble two-phase flow in the second mixing chamber, then flows through the foaming mesh structure to foam, and uniform and stable bubble flow is generated in the foaming chamber, which promotes the formation of bubbles and accelerates the breaking of liquid droplets, not only refines the fuel droplets and improves the bubble group density in the gas-liquid mixing process, but also solves the problems of easy coalescence of bubbles in the bubble two-phase flow and uneven spatial distribution of gas-liquid two-phase. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0022] Figure 1 A structure schematic diagram of a foaming bubble atomizing nozzle suitable for fuel with wide range of viscosity is provided for the embodiments of the present application.

[0023] Figure 2 A structure schematic diagram of a foaming steam channel structure is provided for the embodiments of the present application.

[0024] Figure 3 A top view of a foaming mesh structure is provided for the embodiments of the present application.

[0025] Figure 4 A cross-sectional schematic diagram of the foaming mesh structure is provided for the embodiments of the present application.

[0026] Explanation of reference signs:

[0027] 1- Nozzle, 2- Spray hole, 3- Foaming chamber, 4- Foaming mesh structure, 5- Second mixing chamber, 6- Sprayer, 7- Oil spray hole, 8- First mixing chamber, 9- Foaming steam channel structure, 10- Foaming steam nozzle, 11- Pneumatic atomizing steam channel, 12- Steam sleeve, 13- Fuel oil pipe, 14- Steam channel, 15- Fuel oil channel, 16- Wide range viscosity fuel connector, 17- Atomizing steam connector, 18- Mixing sleeve, 19- Foaming mesh, 191- Foaming mesh inlet, 192- Foaming mesh outlet. Detailed Implementation

[0028] 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.

[0029] like Figures 1 to 4 As shown, a foaming atomizing nozzle suitable for fuels with a wide range of viscosities includes a nozzle 1, a mixing sleeve 18, and a steam sleeve 12 connected in sequence from front to back.

[0030] The front end of the mixing sleeve 18 is connected to the nozzle 1 and is provided with a foaming mesh structure 4. The nozzle 1 is provided with a number of evenly distributed spray holes 2 and a foaming chamber 3 is formed between its inner cavity and the foaming mesh structure 4.

[0031] A foaming steam channel structure 9 is provided at the rear end of the mixing sleeve 18 where it is connected to the steam sleeve 12, and a sprayer 6 is provided on the side of the foaming steam channel structure 9 near the mixing sleeve 18.

[0032] The inner cavity of the steam jacket 12 is provided with a fuel oil pipe 13 arranged coaxially therewith, and a steam channel 14 is formed between the outer wall of the fuel oil pipe 13 and the inner wall of the steam jacket 12.

[0033] The rear end of the fuel oil pipe 13 extends beyond the steam sleeve 12 and is connected to the wide-range viscosity fuel connector 16; the front end of the fuel oil pipe 13 passes through the foaming steam channel structure 9 and forms a first mixing chamber 8 between it and the inner cavity of the sprayer 6; the interior of the fuel oil pipe 13 is defined as the fuel oil channel 15, and the front end of the fuel oil pipe 13 has several oil injection holes 7 that connect the fuel oil channel 15 and the first mixing chamber 8.

[0034] A second mixing chamber 5 is formed between the inner wall of the mixing sleeve 18 and the outer wall of the sprayer 6. The foaming steam channel structure 9 has a plurality of foaming steam nozzles 10 that connect the second mixing chamber 5 and the steam channel 14, as well as a plurality of pneumatic atomizing steam channels that connect the first mixing chamber 8 and the steam channel 14.

[0035] The steam jacket 12 is provided with an atomized steam joint 17 connected with the steam channel 14.

[0036] The foaming steam nozzle 10 is a cylindrical channel or a tapered channel, which is uniformly distributed on the foaming steam channel structure 9.

[0037] The sprayer 6 is provided with an atomized spraying hole, which is used for uniformly atomizing and spraying the gas-liquid mixture to the second mixing chamber 5.

[0038] The foaming mesh structure 4 is a perforated plate structure, which is provided with a plurality of foaming meshes 19, the shape of the foaming mesh 19 includes a circle, a triangle, an ellipse, a rectangle, and a trapezoid, and the area of the foaming mesh inlet 191 is larger than that of the foaming mesh outlet 192.

[0039] The foaming mesh structure 4 is a metal mesh or a porous material, and the number of layers is one or more.

[0040] The number of the spraying holes 2 is 4-12, the diameter is 1-10 mm, and the included angle between the center line of the spraying hole 2 and the central axis of the whole nozzle is 10°-80°.

[0041] In use, high-pressure steam enters the steam channel 14 from the atomized steam joint 17 at the end of the nozzle, part of which enters the pneumatic atomized steam channel 11 to form a primary atomized gas flow, and the other part enters the foaming steam nozzle 10 to form a foaming gas flow, the foaming steam nozzle 10 is a cylindrical channel, which is uniformly distributed on the foaming steam channel structure 9, as shown in Figure 2 The liquid fuel enters the central fuel oil channel 15 from the wide-range viscosity fuel joint 16, and then is sprayed at high speed from the oil injection hole 7, and then is subjected to violent impact and shearing with the primary atomized gas flow, enters the first mixing chamber 8, and forms a bubble two-phase flow to complete the first atomization. Then, the above-mentioned bubble two-phase flow flows through the sprayer 6, is uniformly sprayed into the second mixing chamber 5, and the foaming gas flow and the above-mentioned sprayed bubble two-phase flow are subjected to shearing and extrusion in the second mixing chamber 5 to promote the breaking of the liquid droplets and the re-generation of the bubbles, and then flows through the foaming mesh structure 4 into the foaming chamber 3 after completing the second atomization; the foaming mesh structure 4 is Figure 3 and Figure 4The shown perforated plate structure is a tapered cylindrical channel, i.e. the inlet diameter is larger than the outlet diameter. Under the blowing of the high-speed foaming gas flow, the sprayed bubble two-phase flow is further foamed on the foaming perforated plate structure 4, to generate a uniform and stable bubble flow in the foaming chamber 3, to complete the third atomization, which further accelerates the breaking of the liquid droplets, increases the bubble group density, not only refines the fuel oil droplets, but also solves the problems of easy coalescence of the bubbles in the bubble two-phase flow and uneven spatial distribution of the gas-liquid two phases. Finally, the uniform and stable bubble two-phase flow is sprayed out at high speed through the spray hole 2, to promote its sharp expansion and even breakage, to further break into fine liquid mist particles.

[0042] The present application adopts the sprayer coupled with the foaming perforated plate structure to perform multiple atomization and foaming on the gas-liquid two-phase flow, effectively enhances the uniformity and stability of the bubble two-phase flow in the gas-liquid two-phase bubble flow atomization process, and solves the problems of insufficient atomization and unevenness of the wide-range viscosity fuel oil.

[0043] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and the equivalent technologies thereof, the present application also intends to include these modifications and variations.

Claims

1. A foaming atomizing nozzle suitable for fuels with a wide range of viscosities, characterized in that: It includes a nozzle (1) connected from front to back, a mixing sleeve (18) with a venturi structure cavity, and a steam sleeve (12). The front end of the mixing sleeve (18) is connected to the nozzle (1) and is provided with a foaming mesh structure (4). The nozzle (1) is provided with several evenly distributed spray holes (2) and a foaming chamber (3) is formed between its inner cavity and the foaming mesh structure (4). A foaming steam channel structure (9) is provided at the rear end of the mixing sleeve (18) where it is connected to the steam sleeve (12), and a sprayer (6) is provided on the side of the foaming steam channel structure (9) near the mixing sleeve (18). The inner cavity of the steam jacket (12) is provided with a fuel oil pipe (13) arranged coaxially with it, and a steam channel (14) is formed between the outer wall of the fuel oil pipe (13) and the inner wall of the steam jacket (12). The rear end of the fuel oil pipe (13) extends outside the steam sleeve (12) and is connected to a wide-range viscosity fuel connector (16); the front end of the fuel oil pipe (13) passes through the foaming steam channel structure (9) and forms a first mixing chamber (8) between it and the inner cavity of the sprayer (6). The fuel oil pipe (13) has several injection holes (7) at its front end that connect to the first mixing chamber (8). A second mixing chamber (5) is formed between the inner wall of the mixing sleeve (18) and the outer wall of the sprayer (6). The foaming steam channel structure (9) has several foaming steam nozzles (10) that connect the second mixing chamber (5) and the steam channel (14), as well as several pneumatic atomizing steam channels (11) that connect the first mixing chamber (8) and the steam channel (14). The steam sleeve (12) is provided with an atomizing steam connector (17) that connects to the steam channel (14) on its pipe wall. The sprayer (6) is provided with atomizing spray holes for uniformly atomizing and spraying the gas-liquid two-phase mixture into the second mixing chamber (5). The foamed mesh structure (4) is a perforated plate structure with a number of foamed mesh holes (19) on it. The area of ​​the foamed mesh hole inlet (191) on the foamed mesh hole (19) is larger than the area of ​​its foamed mesh hole outlet (192).

2. The foaming atomizing nozzle suitable for fuels with a wide range of viscosities according to claim 1, characterized in that, The foaming steam nozzles (10) are cylindrical channels that are evenly distributed along the circumference on the foaming steam channel structure (9).

3. The foaming atomizing nozzle suitable for fuels with a wide range of viscosities according to claim 1, characterized in that, The foamed mesh structure (4) is a metal wire mesh or a porous material, with one or more layers.

4. A foaming atomizing nozzle suitable for fuels with a wide range of viscosities according to claim 1, characterized in that, The number of spray holes (2) is 4 to 12, the diameter is 1 to 10 mm, and the angle between the center line of the spray hole (2) and the central axis of the entire nozzle is 10° to 80°.

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