Internal mixing structure of heavy oil burner nozzle

Abstract

The utility model discloses a kind of inner mixing structures of heavy oil burner nozzle, between input channel and spray head, by the second liquid fuel hole of inner mixing structure can make liquid fuel flow rate sharply increase, by liquid fuel guide groove can form high-speed centrifugal rotation, after relatively larger third, fourth liquid fuel hole, hollow conical liquid film is formed, to realize first stage mechanical atomization;High-pressure atomization medium is after atomization medium hole with sonic flow, after atomization medium guide groove collides liquid film, it is broken to realize primary medium atomization, can make oil film break more evenly.Enter into mixing cavity again and by mist spray port with mist high-speed spray, form atomization torch, to realize secondary medium atomization.The utility model can make high viscosity oil fully atomized, make oil product atomization into very fine oil particle, to realize sufficient combustion, to effectively avoid the condition of black smoke when burning.

Description

Technical Field

[0001] This utility model pertains to oil gun nozzles, specifically relating to an internal mixing structure for a heavy oil burner nozzle. Background Technology

[0002] For kinematic viscosity γ 40 Heavy fuel oil fractions with a flow rate ≥5.5 mm² / s have extremely poor fluidity, making complete combustion very difficult. Therefore, for high-viscosity oils such as heavy oil and residual oil, atomization typically utilizes media atomization, which uses the kinetic energy of a medium at high speed and high pressure to disperse the oil into tiny droplets. However, currently, commonly used media atomization nozzles are Y-type or hybrid nozzles, which still fail to achieve ideal atomization levels for high-viscosity oils. Due to the large diameter of the oil mist particles, uneven combustion, high emissions, and black smoke are observed. Therefore, there is an urgent need for a fuel medium mixing structure that can fully atomize high-viscosity oils within the nozzle, preventing the nozzle from breaking down into carbon black particles due to incomplete evaporation. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an internal mixing structure for a heavy oil burner nozzle, which can fully atomize high-viscosity oil products.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An internal mixing structure for a heavy oil burner nozzle is disposed between an input channel and a nozzle head. The input channel includes a liquid fuel channel and an atomizing medium channel surrounding the liquid fuel channel. The internal mixing structure comprises four internal mixing components arranged sequentially from back to front. The first internal mixing component has a first liquid fuel hole communicating with the liquid fuel channel and a plurality of first atomizing medium holes evenly distributed around the first liquid fuel hole and communicating with the atomizing medium channel. The second internal mixing component has a ring of second liquid fuel holes evenly distributed around the first liquid fuel hole and communicating with it, with a diameter smaller than the diameter of the liquid fuel channel; a plurality of second atomizing medium holes evenly distributed around the second liquid fuel hole and communicating with the first atomizing medium hole; and the front end face of the second internal mixing component also has a component corresponding to the second liquid fuel hole. The system includes multiple liquid fuel guide channels, each starting from its corresponding second liquid fuel hole, extending at an angle and connecting to form a tangentially circular inner groove. The third internal mixing component has a third liquid fuel hole communicating with the tangentially circular inner groove, and multiple third atomizing medium holes evenly distributed around the third liquid fuel hole and communicating with the second atomizing medium hole. The third liquid fuel hole is designed as two connected sections, with the rear section being a flared hole with a gradually decreasing diameter from back to front, and the front section being a hole of equal diameter. The fourth internal mixing component has a fourth liquid fuel hole communicating with the third liquid fuel hole, multiple fourth atomizing medium holes evenly distributed around the fourth liquid fuel hole and communicating with the third atomizing medium hole, and multiple atomizing medium guide channels located on the front end face of the fourth internal mixing component and radially connecting the fourth liquid fuel hole and the fourth atomizing medium hole.

[0005] The liquid fuel channel, the first, third, and fourth liquid fuel holes, and the nozzle are located on the central axis of the nozzle; the first, second, third, and fourth atomizing medium holes and the second liquid fuel hole are all evenly distributed along the central axis.

[0006] The axial thickness of the liquid fuel guide channel is 0.25-0.5 times the axial thickness of the second internal mixing component.

[0007] The diameters of the third and fourth liquid fuel orifices are both larger than the diameter of the second liquid fuel orifice.

[0008] The diameter of the second liquid fuel orifice is 0.05-0.15 times the diameter of the liquid fuel channel.

[0009] The nozzle is a frustum-shaped structure with a diameter that gradually decreases from back to front and has a closed front end. The rear end has an annular baffle to cover the atomizing medium guide groove to form a closed channel. The inside of the nozzle is a mixing chamber that communicates with the fourth liquid fuel hole, and multiple droplet nozzles are opened on the side wall.

[0010] The internal mixing structure is also provided with a sleeve that is inserted into the nozzle and threaded to the outer wall of the first internal mixing component. The front end of the sleeve has a retaining ring. The nozzle passes through the retaining ring, and the outer edge of the annular partition of the nozzle extends beyond the nozzle and abuts against the inner end face of the retaining ring.

[0011] The internal mixing structure of the heavy oil burner nozzle of this invention allows for a rapid increase in liquid fuel flow velocity through the second liquid fuel orifice. High-speed centrifugal rotation is achieved through the liquid fuel guide channel, resulting in intense lateral turbulence and even self-tearing of the liquid fuel. After passing through the relatively larger third and fourth liquid fuel orifices, a hollow conical liquid film is formed, achieving the first stage of mechanical atomization. The high-pressure atomizing medium flows at sonic speed through the atomizing medium orifice and then impacts the hollow conical liquid film through the atomizing medium guide channel, causing the liquid film to break up and achieving primary medium atomization. This results in more uniform oil film breakage, meaning smaller and more uniform atomized particles. This facilitates the complete atomization of high-viscosity oil, turning the oil into extremely fine oil particles for complete combustion, thus effectively preventing black smoke during combustion. Attached Figure Description

[0012] The utility model will now be described in detail with reference to the accompanying drawings and specific embodiments: Figure 1 This is a three-dimensional sectional view of the heavy oil burner nozzle of this utility model; Figure 2 This is a cross-sectional view of the nozzle of this utility model without the nozzle. Figure 3 This is a three-dimensional sectional view of the nozzle of this utility model without the nozzle. Figure 4 This is an exploded view of the internal mixing structure of this utility model. Figure 5 This is an exploded schematic diagram of the internal mixing structure of this utility model from another perspective. Figure 6 This is a structural schematic diagram of the second internal mixing component of this utility model from an axial perspective. Figure 7 This is a perspective sectional view of the third internal mixing component of this utility model; Figure 8 This is a cross-sectional schematic diagram of the third internal mixing component of this utility model; Figure 9 This is a three-dimensional sectional view of the nozzle of this utility model; Detailed Implementation

[0013] The present invention relates to an internal mixing structure for a heavy oil burner nozzle, as shown in the figure below. Figures 1-9As shown, it is located between the input channel and the nozzle 7. The input channel includes a liquid fuel channel 2 and an atomizing medium channel 1 sleeved outside the liquid fuel channel 2. The internal mixing structure includes first, second, third, and fourth internal mixing accessories 3, 4, 5, and 6 arranged sequentially from back to front. Among them, the first internal mixing accessory 3 is provided with a first liquid fuel hole 32 communicating with the liquid fuel channel 2, and a plurality of first atomizing medium holes 31 evenly distributed around the first liquid fuel hole 32 and communicating with the atomizing medium channel 1. The second internal mixing component 4 has a ring of second liquid fuel holes 42 that are evenly distributed and communicate with the first liquid fuel hole 32 and have a diameter smaller than the diameter of the liquid fuel channel 2. It also has a plurality of second atomizing medium holes 41 that are evenly distributed around the second liquid fuel holes 42 and communicate with the first atomizing medium hole 31. The front end face of the second internal mixing component 4 also has a plurality of liquid fuel guide grooves 43 corresponding to the second liquid fuel holes 42. The liquid fuel guide grooves 43 start from their respective corresponding second liquid fuel holes 42, slope inwards, and connect to each other to form a tangentially circular inner groove 44. The third internal mixing component 5 has a third liquid fuel hole 52 that communicates with the tangentially circular inner groove 44. It also has a plurality of third atomizing medium holes 51 that are evenly distributed around the third liquid fuel holes 52 and communicate with each of the second atomizing medium holes 41. The third liquid fuel hole 52 is designed as two connected sections: the rear section is a flared hole with a gradually decreasing diameter from back to front, and the front section is a hole of equal diameter. The fourth internal mixing component 6 is provided with a fourth liquid fuel hole 63 communicating with the third liquid fuel hole 52, a plurality of fourth atomizing medium holes 61 evenly distributed around the fourth liquid fuel hole 63 and communicating with the third atomizing medium hole 51, and a plurality of atomizing medium guide grooves 62 provided on the front end face of the fourth internal mixing component 6 and respectively radially connecting the fourth liquid fuel hole 63 and the fourth atomizing medium hole 61. Through the atomizing medium guide grooves 62, the atomizing medium can be collected from the fourth atomizing medium hole 61 through the atomizing medium guide grooves 62 and collected in the fourth liquid fuel hole 63.

[0014] The nozzle 7 is a frustum-shaped cylinder with a diameter that gradually decreases from back to front and has a closed front end face 72. The rear end has an annular baffle 75 for covering the atomizing medium guide groove 62 to form a closed channel. The inside of the nozzle 7 is a mixing chamber that communicates with the fourth liquid fuel hole 63, and multiple droplet nozzles 71 are opened on the side wall.

[0015] The front end of the liquid fuel channel 2 extends beyond the front end of the atomizing medium channel 1. The first internal mixing component 3 has a tubular structure with a step at its rear end that connects to the front end of the atomizing medium channel 1 via welding. The first liquid fuel hole 32 and the first atomizing medium hole 31 are formed at the front of the first internal mixing component 3, and the rear end of the first liquid fuel hole 32 has a step that connects to the front end of the liquid fuel channel 2. The second internal mixing component 4 is generally circular. The third and fourth internal mixing components 5 and 6 are generally annular. The central hole 74 of the annular baffle 75 serves as a channel for the liquid fuel and atomizing medium to mix and enter the nozzle 7, and communicates with the fourth liquid fuel hole 63.

[0016] The liquid fuel channel 2, the first, third, and fourth liquid fuel holes 32, 52, and 63, and the central hole 74 of the annular baffle 75 are located on the central axis of the nozzle. The first, second, third, and fourth atomizing medium holes 31, 41, 51, and 61, as well as the second liquid fuel hole 32, are all evenly distributed along the central axis of the nozzle and are interconnected one by one.

[0017] The axial thickness of the liquid fuel guide channel 43 is 0.25-0.5 times the axial thickness of the second internal mixing component 4.

[0018] The diameter of the second liquid fuel orifice 42 is 0.05-0.15 times the diameter of the liquid fuel channel 2. The diameters of the third and fourth liquid fuel orifices 63 are also larger than the diameter of the second liquid fuel orifice 42.

[0019] The following connection and fitting methods can be used between internal mixing components and with nozzle 7: The internal mixing structure of this utility model is also provided with a sleeve 8 that is inserted into the nozzle 7 and connected to the outer wall thread 33 of the first internal mixing component 3. The front end of the sleeve 8 has a retaining ring 81, and the nozzle 7 passes through the retaining ring 81. The outer diameter of the annular partition 75 of the nozzle 7 is larger than the maximum diameter of the truncated cone of the nozzle 7 and larger than the inner diameter of the retaining ring 81. In this way, when the sleeve 8 is screwed backward, all internal mixing components and the nozzle 7 can be fitted and fixed together until the inner end face of the retaining ring 81 abuts and is fixed to the annular partition 75.

[0020] The atomization method of the nozzle with the internal mixing structure of this utility model includes the following steps: Liquid fuel is introduced into the internal mixing structure through liquid fuel channel 2, passing through the first liquid fuel hole 32 to the second liquid fuel hole 42. Since the flow area of ​​the second liquid fuel hole 42 is relatively small compared to the liquid fuel channel 2, the flow velocity of the liquid fuel will increase sharply after passing through the second liquid fuel hole 42. After increasing the flow velocity of the second liquid fuel hole 42, it passes through the liquid fuel guide groove 43 to form high-speed centrifugal rotation, which makes the transverse turbulence of the liquid fuel intense, and even self-tearing. The high-speed centrifugal rotating liquid fuel then continues to pass through the third and fourth liquid fuel holes with relatively larger diameters to form a hollow conical liquid film, which breaks the liquid film to achieve primary medium atomization, making the oil film break more uniform, that is, the atomized particles are smaller and more uniform. Simultaneously, a high-pressure (e.g., 0.7-1 MPa) atomizing medium is introduced into the internal mixing structure through atomizing medium channel 1. After passing through the first, second, third, and fourth atomizing medium holes, it flows at sonic speed and then through the atomizing medium guide groove 62 to the fourth fuel hole, where it collides and mixes with the liquid film. In this way, the atomizing medium can impact the liquid film, causing it to break and form primary medium atomization, making the oil film break more uniform, i.e., the atomized particles are smaller and more uniform. After mixing, it is introduced into the mixing chamber through the central hole 74 of the annular partition 75 and sprayed out at high speed in a mist form through the droplet nozzle 71 to form an atomizing torch, thus realizing secondary medium atomization.

[0021] However, those skilled in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Any changes or modifications to the above embodiments within the scope of the essential spirit of the present utility model will fall within the scope of the claims of the present utility model.

Claims

1. An internal mixing structure for a heavy oil burner nozzle, disposed between an input channel and a nozzle head, wherein the input channel includes a liquid fuel channel and an atomizing medium channel sleeved outside the liquid fuel channel, characterized in that: The internal mixing structure includes four internal mixing components arranged sequentially from back to front. The first internal mixing component has a first liquid fuel hole communicating with the liquid fuel channel and a plurality of first atomizing medium holes evenly distributed around the first liquid fuel hole and communicating with the atomizing medium channel. The second internal mixing component has a ring of second liquid fuel holes evenly distributed around the first liquid fuel hole and communicating with the first liquid fuel hole, with a diameter smaller than the diameter of the liquid fuel channel, and a plurality of second atomizing medium holes evenly distributed around the second liquid fuel hole and communicating with the first atomizing medium hole. The front end face of the second internal mixing component also has a plurality of liquid fuel guide grooves corresponding to the second liquid fuel holes, with each liquid fuel guide groove starting from its corresponding second liquid fuel hole. The components are inclined and interconnected to form a tangentially shaped inner groove; the third inner mixing component is provided with a third liquid fuel hole communicating with the tangentially shaped inner groove, and multiple third atomizing medium holes evenly distributed around the third liquid fuel hole and communicating with the second atomizing medium hole. The third liquid fuel hole is designed as two connected sections, with the rear section being a trumpet hole with a gradually decreasing diameter from back to front, and the front section being a hole of equal diameter; the fourth inner mixing component is provided with a fourth liquid fuel hole communicating with the third liquid fuel hole, multiple fourth atomizing medium holes evenly distributed around the fourth liquid fuel hole and communicating with the third atomizing medium hole, and multiple atomizing medium guide grooves provided on the front end face of the fourth inner mixing component and radially connected to the fourth liquid fuel hole and the fourth atomizing medium hole respectively.

2. The internal mixing structure of a heavy oil burner nozzle according to claim 1, characterized in that: The liquid fuel channel, the first, third, and fourth liquid fuel holes, and the nozzle are located on the central axis of the nozzle; the first, second, third, and fourth atomizing medium holes and the second liquid fuel hole are all evenly distributed along the central axis.

3. The internal mixing structure of a heavy oil burner nozzle according to claim 1, characterized in that: The axial thickness of the liquid fuel guide channel is 0.25-0.5 times the axial thickness of the second internal mixing component.

4. The internal mixing structure of a heavy oil burner nozzle according to claim 1, characterized in that: The diameters of the third and fourth liquid fuel orifices are both larger than the diameter of the second liquid fuel orifice.

5. The internal mixing structure of a heavy oil burner nozzle according to claim 1, characterized in that: The diameter of the second liquid fuel orifice is 0.05-0.15 times the diameter of the liquid fuel channel.

6. The internal mixing structure of a heavy oil burner nozzle according to claim 1, characterized in that: The nozzle is a frustum-shaped structure with a diameter that gradually decreases from back to front and has a closed front end. The rear end has an annular baffle to cover the atomizing medium guide groove to form a closed channel. The inside of the nozzle is a mixing chamber that communicates with the fourth liquid fuel hole, and multiple droplet nozzles are opened on the side wall.

7. The internal mixing structure of a heavy oil burner nozzle according to claim 6, characterized in that: The internal mixing structure is also provided with a sleeve that is inserted into the nozzle and threaded to the outer wall of the first internal mixing component. The front end of the sleeve has a retaining ring. The nozzle passes through the retaining ring, and the outer edge of the annular partition of the nozzle extends beyond the nozzle and abuts against the inner end face of the retaining ring.

Images