CN219943265U

CN219943265U - Gas-assisted atomization nozzle, spray gun and spray device

Info

Publication number: CN219943265U
Application number: CN202320338708.2U
Authority: CN
Inventors: 高永川; 邵松; 杨建涛
Original assignee: Luoyang Ruichang Environmental Engineering Co ltd
Current assignee: Luoyang Ruichang Environmental Engineering Co ltd
Priority date: 2023-02-28
Filing date: 2023-02-28
Publication date: 2023-11-03
Anticipated expiration: 2033-02-28

Abstract

The utility model discloses a nozzle, a spray gun and a spray device for gas-assisted atomization. Wherein the nozzle for gas-assisted atomization comprises a double-layer tube comprising an inner tube and an outer tube; the outer pipe is sleeved outside the inner pipe, a gap is formed between the outer pipe and the inner pipe, the gap is used for conveying gas, and the inner pipe is used for conveying liquid; a conical stop block is fixedly arranged at the pipe orifice at the tail end of the inner pipe; the small end of the conical stop block stretches into the inner tube, and an annular gap is reserved between the outer surface of the conical stop block and the opening edge of the inner tube. In the nozzle structure adopted by the utility model, the liquid forms a liquid film by utilizing the kinetic energy of the liquid, the interaction area between the liquid and high-speed gas is increased, the film formation is easier, and a better atomization effect can be obtained on the premise of not increasing the gas consumption.

Description

Gas-assisted atomization nozzle, spray gun and spray device

Technical Field

The utility model belongs to the technical field of flue gas purification devices, relates to the technical field of gas-assisted atomization, and in particular relates to a gas-assisted atomization nozzle, a spray gun and a spray device.

Background

Alkaline solution introduced into the flue gas and SO in the flue gas are adopted in the blue plume treatment process ₃ The substances react rapidly, and the blue smoke plume substances are removed before the smoke is discharged, so that the aim of purifying the smoke is fulfilled. In order to improve the atomization effect of the alkaline solution, atomized liquid drops are fully contacted with the flue gas, so that the specific surface area is increased, and the reaction rate is improved, and the process is generally finished by a spray gun for gas-assisted atomization. The gas-assisted atomization spray gun outputs high-speed flowing gas and liquid at the nozzle, and the high-speed flowing gas and the liquid collide with each other to form liquid drops and are finally sprayed out of the nozzle, so that finer liquid drops are obtained. Such as those shown in chinese patent documents with publication numbers CN217829565U and CN 206731351U.

The problem in the prior art is that the droplet refining effect of the traditional gas-assisted atomization spray gun depends on the flow rate of gas, and the flow rate of the gas needs to be increased to obtain sufficiently refined droplets, so that the gas consumption is large, and the cost and the energy consumption are increased.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model provides a gas-assisted atomization nozzle, a spray gun and a spray device. The purpose is to promote the gas and the liquid to be fully mixed at the nozzle under the premise of a certain gas flow so as to refine liquid drops and improve atomization effect; and then the alkaline liquid drops are uniformly distributed in the flue gas pipeline, so that the effect of flue gas purification is improved.

In order to achieve the above purpose, the present utility model provides the following technical solutions: a nozzle for gas-assisted atomization, comprising a double tube comprising an inner tube and an outer tube; the outer pipe is sleeved outside the inner pipe, a gap is formed between the outer pipe and the inner pipe, the gap is used for conveying gas, and the inner pipe is used for conveying liquid; the conical stop block is arranged at a pipe orifice at the tail end of the inner pipe; the small end of the conical stop block extends into the inner tube, and an annular gap is reserved between the outer surface of the conical stop block and the opening edge of the inner tube; the cover body is also included; the cover body is connected to the tail end of the outer pipe in a covering way, and a plurality of nozzles for spraying atomized liquid drops are arranged on the top wall of the cover body; the cover body comprises a primary cover and a secondary cover; one end of the primary cover is connected with the outer wall of the outer tube through threads, and the other end of the primary cover is connected with the secondary cover through threads; the nozzle is arranged on the top wall of the secondary cover; a plurality of supporting rods are circumferentially and uniformly distributed on the outer wall of the conical stop block, and two ends of each supporting rod are fixedly connected to the inner wall of the secondary cover and the outer wall of the conical stop block respectively.

As a further optimization, the device also comprises an inclined annular plate; the inclined annular plate is positioned in the annular gap between the inner tube and the primary cover, and is fixedly connected to the inner wall of the primary cover, and a plurality of air holes are formed in the surface of the inclined annular plate.

The utility model also provides a spray gun for gas-assisted atomization, which comprises the spray nozzle.

Further, the spray gun comprises a liquid pipe, an air pipe and a plurality of nozzles; the air pipe is sleeved on the outer side of the liquid pipe, and a gap is reserved between the air pipe and the liquid pipe; one end of the air pipe is open, the other end of the air pipe is closed, and an air source connector is arranged on the side wall of the air pipe; one end of the liquid pipe positioned in the air pipe is closed, and the other end of the liquid pipe extends out of the opening and is provided with a liquid source interface; a connecting flange is arranged at the opening of the air pipe; a plurality of nozzles are arranged on the side wall of the spray gun at intervals; the inner tube and the outer tube of each nozzle are respectively communicated with the liquid tube and the air tube.

The utility model also provides a spraying device for gas-assisted atomization, which comprises the spray gun.

Further, a plurality of spray guns are arranged, and are uniformly distributed circumferentially and inserted on the side wall of the flue gas pipeline; the spray nozzles of each spray gun are all located inside the flue gas pipeline, and the air source interface and the liquid source interface are both located outside the flue gas pipeline and are respectively communicated with the air pipeline and the liquid pipeline.

Compared with the prior art, the utility model has the beneficial effects that:

the liquid output from the inner tube of the nozzle hits the wall surface of the conical stop block to form an annular liquid film, and the liquid film is broken up by the high-speed gas output from the outer tube to form fine liquid drops. The liquid drops and the gas continue to undergo secondary atomization processes such as shearing, collision and crushing in the cavity of the cover body, the size of the liquid drops is further reduced, and then the liquid drops are sprayed out from the spray nozzle. Due to the atomization process, i.e. the liquid dispersion process, the energy of the gas is transferred to the liquid, increasing the total area of the liquid and forming droplets. According to the related theory of atomization, in the gas-liquid interaction process, the larger the acting area between gas and liquid is, the higher the energy transfer efficiency is, and the conical stop block is arranged at the outlet of the inner pipe, so that the probability of gas-liquid interaction is increased, and finer liquid drop particles can be obtained under the same air pressure and air flow; in other words, the amount of gas consumed to obtain droplets of the same size is small, with other conditions unchanged. In the nozzle structure adopted by the utility model, the liquid forms a liquid film by utilizing the kinetic energy of the liquid, the interaction area between the liquid and high-speed gas is increased, the film formation is easier, and a better atomization effect can be obtained on the premise of not increasing the gas consumption.

Drawings

Fig. 1 is a schematic structural view of a spraying device according to embodiment 1 of the present utility model;

FIG. 2 is a schematic view of the structure of the spray gun of example 1 of the present utility model;

FIG. 3 is a schematic view showing the structure of a nozzle according to embodiment 1 of the present utility model;

fig. 4 is a schematic view of the connection structure of the strut according to embodiment 1 of the present utility model.

In the figure: 1 inner pipe, 2 outer pipe, 3 conical baffle, 31 supporting rod, 4 cover body, 41 spout, 42 first level cover, 43 second level cover, 5 inclined annular plate, 51 gas hole, 6 spray gun, 61 liquid pipe, 611 liquid source interface, 62 gas pipe, 621 gas source interface, 622 connecting flange, 7 spray nozzle, 8 flue gas pipe, 81 gas collecting pipe, 82 liquid collecting pipe, 83 hose, 84 manometer.

Detailed Description

The present utility model now will be described more fully hereinafter with reference to the accompanying drawings, in which it is shown, however, to illustrate only a part, and not all of the preferred embodiments of the utility model. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present utility model, and are not intended to limit the scope of the present utility model.

Example 1: please refer to fig. 1-4;

a spraying device for gas-assisted atomization is applied to spray alkaline liquid drops in a flue gas pipeline 8 to promote flue gas purification. The spraying device is provided with a gas-assisted atomization spray gun 6, wherein the spray gun 6 is provided with a gas-assisted atomization nozzle 7.

The diameter of flue gas pipeline of a refinery or a thermal power plant is generally larger, for example, the flue size of a certain medium-scale thermal power plant is 9m by 14m. Because field devices are typically relatively dense, the distance of the straight section upstream and downstream of the lance installation site is typically relatively short. To ensure that the sprayed alkali liquor evaporates as soon as possible and reacts with SO in the flue gas ₃ Under the condition of a certain alkali liquor spraying amount, the method has the advantages that under the condition that the alkali liquor spraying amount is certain, a proper spray gun is selected to enable the atomized average particle size of the alkali liquor to be as small as possible and uniformly distributed, a multi-spray gun mode is adopted, even a multi-layer spray gun combined arrangement mode is adopted, SO that the coverage rate of the alkali liquor spraying to the flue gas is increased, the contact of liquid drops and the flue gas is enabled to be more sufficient, and the evaporation rate and the subsequently generated small particles and SO in the flue gas are accelerated ₃ Is a reaction rate of (a).

The spraying device in the embodiment is shown in fig. 1, and comprises a plurality of spraying guns 6, wherein the spraying guns are uniformly distributed circumferentially and inserted on the side wall of a flue gas pipeline 8; the spray gun 6 is fixed on the flue gas pipeline 8 through a flange.

As shown in fig. 2, the spray gun 6 includes a liquid pipe 61, an air pipe 62, and a plurality of the nozzles 7; the air pipe 62 is sleeved outside the liquid pipe 61, and a gap is reserved between the air pipe and the liquid pipe 61; one end of the air pipe 62 is open, the other end is closed, and an air source connector 621 is arranged on the side wall of the air pipe; one end of the liquid pipe 61 positioned in the air pipe 62 is closed, and the other end extends out of the opening and is provided with a liquid source interface 611; a connecting flange 622 is provided at the opening of the air tube 62; a plurality of the nozzles 7 are provided at intervals on the side wall of the spray gun 6.

As shown in fig. 3, the nozzle 7 comprises a double tube comprising an inner tube 1 and an outer tube 2; the outer tube 2 is sleeved outside the inner tube 1, a gap is formed between the outer tube and the inner tube 1, the gap is used for conveying gas, and the inner tube 1 is used for conveying liquid; the conical stop 3 is arranged at the pipe orifice at the tail end of the inner pipe 1; the small end of the conical stop block 3 extends into the inner tube 1, and an annular gap is reserved between the outer surface of the conical stop block and the opening edge of the inner tube 1. Therefore, the tip of the tapered stopper 3 is extended into the inner tube 1 by a certain distance, which ensures that a ring-shaped passage is formed between the rotation surface of the tapered stopper 3 and the outlet of the inner tube 1, and can ensure smooth discharge of liquid and impurities, thereby avoiding clogging. The inner tube 1 and the outer tube 2 of each of the nozzles 7 are respectively communicated with the liquid tube 61 and the gas tube 62.

The nozzle 7 of each spray gun 6 is located inside the flue gas pipe 8, and the gas source interface 621 and the liquid source interface 611 are located outside the flue gas pipe 8 and are respectively communicated with a gas pipe and a liquid pipe, which are respectively used for conveying liquid and gas in the liquid pipe 61 and the gas pipe 62.

Exemplary gas and liquid delivery is by way of the gas and liquid entering the respective gas and liquid manifolds 81, 82, respectively. The gas collecting pipe 81 and the liquid collecting pipe 82 are provided with a plurality of branch pipes, and each branch pipe is respectively connected with the gas source interface 621 and the liquid source interface 611 of the spray gun 6 through a hose 83. Each branch pipe of the gas collecting pipe 81 and the liquid collecting pipe 82 is provided with a pressure gauge 84, and whether the spray gun 6 is blocked or not and a specific spray gun is blocked are judged by monitoring the reading change of the pressure gauge 84, so that the overhaul is convenient.

In use, gas is fed into the gas pipe 62 of the spray gun 6 via the gas manifold 81, the branch pipe, the hose 83 and the gas source interface 621, and liquid is fed into the liquid pipe 61 of the spray gun via the liquid manifold 82, the branch pipe, the hose 83 and the liquid source interface 611. Under the action of pressure, liquid and gas are ejected from the nozzles of the inner tube 1 and the outer tube 2 of the nozzle 7 respectively. The gas sprayed from the outer tube 2 is opposite to the large end of the conical stop block 3, the diameter of the large end is larger than that of the inner tube 1, and the liquid output from the inner tube of the nozzle is impacted on the wall surface of the conical stop block 3 to form an annular liquid film, and the liquid film is broken by the high-speed gas output from the outer tube 2 to form fine liquid drops. Due to the atomization process, i.e. the liquid dispersion process, the energy of the gas is transferred to the liquid, increasing the total area of the liquid and forming droplets. According to the related theory of atomization, in the interaction process of gas and liquid, the larger the acting area between the gas and the liquid is, the higher the energy transfer efficiency is, and the conical stop block 3 is arranged at the outlet of the inner pipe 1, so that the probability of gas-liquid interaction is increased, and finer liquid drop particles can be obtained under the same gas pressure and gas flow; in other words, the amount of gas consumed to obtain droplets of the same size is small, with other conditions unchanged. The existence of the conical stop block 3 enables liquid to form a liquid film by utilizing the kinetic energy of the liquid, the interaction area between the liquid and high-speed gas is increased, the film formation is easier, and better atomization effect can be obtained on the premise of not increasing the gas consumption.

In order to further improve the atomization effect, the device also comprises a cover body 4; the cover body 4 is connected to the tail end of the outer tube 2 in a covering way, and a plurality of nozzles 41 for spraying atomized liquid drops are arranged on the top wall of the cover body; the conical stop 3 is located inside the housing 4.

The droplets and gas continue to undergo secondary atomization processes such as shearing, collision and breaking in the cavity of the cover 4, and the size of the droplets is further reduced, and then the droplets are ejected from the nozzle 41.

The common scene of many shower nozzles application is solution injection, and solution species is unavoidable to contain the impurity that part is liable to precipitate or separate out, and rust etc. that can drop of pipeline inner wall simultaneously easily causes the jam of many shower nozzles, spray gun rifle hole to the use of spray gun has been influenced. In order to be convenient for overhaul after blocking, the cover body 4 is in threaded connection with the outer wall of the outer tube 2, and the cover buckle used for detachably connecting the cover body 4 is connected with the tail end of the outer tube 2. Illustratively, the outer tube 2 is externally threaded and the housing 4 is internally threaded, so that the housing 4 is replaceable.

To facilitate cleaning of the occurrence of blockages, the housing 4 comprises a primary housing 42 and a secondary housing 43; one end of the primary cover 42 is in threaded connection with the outer wall of the outer tube 2, and the other end of the primary cover is in threaded connection with the secondary cover 43; the nozzle 41 is arranged on the top wall of the secondary cover 43; the end of the secondary cover 43 is generally hemispherical, and a plurality of the nozzles 41 are formed in the end of the secondary cover, and droplets and atomizing gas are ejected from the nozzles 41. The number and angle of the spouts 41 can be adjusted as needed.

The outer wall of the conical stop block 3 is circumferentially and uniformly provided with a plurality of supporting rods 31, and two ends of each supporting rod 31 are respectively fixedly connected to the inner wall of the secondary cover 43 and the outer wall of the conical stop block 3. Therefore, when the secondary cover 43 is removed, the conical stop block 3 can be removed at the same time, and the plug at the pipe orifice of the inner pipe 1 can be conveniently cleaned.

In order to obtain a higher velocity of the air flow, an inclined annular plate 5 is also included; the inclined ring plate 5 is located in the annular gap between the inner tube 1 and the primary cover 42, and is fixedly connected to the inner wall of the primary cover 42, and a plurality of air holes 51 are formed in the surface of the inclined ring plate. Therefore, the high-speed air jet ejected from the air hole 51 is blown toward the side wall of the conical stopper 3, the gas flow rate is faster, the atomization of the liquid can be better promoted, and the consumption amount of the gas can be reduced.

In order to maintain a certain pressure, the gas is forced to be ejected from the nozzle 7, and the sum of the areas of the plurality of air holes 51 should be smaller than the area of the main passage (i.e., the area of the annular cross section between the inner tube 1 and the outer tube 2), so that a high-speed gas flow is formed at the outlet. Similarly, the sum of the areas of the plurality of the spouts 41 should be smaller than the cross-sectional area of the outer tube 2.

The nozzle 7 of the present embodiment, on the one hand, can obtain finer droplets at a lower pressure by using a medium-assisted atomizing (two-fluid) nozzle, thereby being more suitable for on-site application conditions and reducing the running cost. On the other hand, a plurality of nozzles 7 can be arranged on each spray gun 6 to increase the density of the spray heads on the section of the flue, thereby improving the contact efficiency of the flue gas and sprayed mist drops and increasing the SO in the flue gas removed by a spraying method ₃ Is effective in (1).In addition, compared with a common spray head structure, the spray gun 6 also increases the passing capacity of impurities, reduces the possibility of spray gun blockage, and is convenient to overhaul, thereby prolonging the service life.

The utility model has not been described in detail in the prior art; it should be understood by those skilled in the art that any combination of the features of the foregoing embodiments may be adopted, and that all possible combinations of the features of the foregoing embodiments are not described for brevity of description, however, such combinations are not to be considered as a contradiction between the features.

Claims

1. A nozzle for gas-assisted atomization, comprising a double tube comprising an inner tube (1) and an outer tube (2); the outer tube (2) is sleeved outside the inner tube (1), a gap is formed between the outer tube and the inner tube (1), gas is conveyed in the gap, and liquid is conveyed in the inner tube (1); the method is characterized in that: the conical stop block (3) is arranged at a pipe orifice at the tail end of the inner pipe (1); the small end of the conical stop block (3) stretches into the inner tube (1), and an annular gap is reserved between the outer surface of the conical stop block and the edge of the inner tube (1);

also comprises a cover body (4); the cover body (4) is covered and buckled at the tail end of the outer tube (2), and a plurality of nozzles (41) for spraying atomized liquid drops are arranged on the top wall of the cover body;

the cover body (4) comprises a primary cover (42) and a secondary cover (43); one end of the primary cover (42) is connected with the outer wall of the outer tube (2) through threads, and the other end of the primary cover is connected with the secondary cover (43) through threads; the nozzle (41) is arranged on the top wall of the secondary cover (43);

a plurality of supporting rods (31) are circumferentially and uniformly distributed on the outer wall of the conical stop block (3), and two ends of each supporting rod (31) are fixedly connected to the inner wall of the secondary cover (43) and the outer wall of the conical stop block (3) respectively.

2. A gas-assisted atomizing nozzle as set forth in claim 1, wherein: also comprises an inclined annular plate (5); the inclined annular plate (5) is positioned in an annular gap between the inner tube (1) and the primary cover (42) and is fixedly connected to the inner wall of the primary cover (42), and a plurality of air holes (51) are formed in the surface of the inclined annular plate.

3. A spray gun for gas-assisted atomization, characterized in that: nozzle (7) comprising a gas-assisted atomization according to any of claims 1-2.

4. A gas-assisted spray gun according to claim 3, wherein: the spray gun (6) comprises a liquid pipe (61), an air pipe (62) and a plurality of nozzles (7); the air pipe (62) is sleeved outside the liquid pipe (61), and a gap is reserved between the air pipe and the liquid pipe (61); one end of the air pipe (62) is open, the other end is closed, and an air source interface (621) is arranged on the side wall of the air pipe; one end of the liquid pipe (61) positioned in the air pipe (62) is closed, and the other end extends out of the opening and is provided with a liquid source interface (611); a connecting flange (622) is arranged at the opening of the air pipe (62);

a plurality of nozzles (7) are arranged on the side wall of the spray gun (6) at intervals; the inner tube (1) and the outer tube (2) of each nozzle (7) are respectively communicated with the liquid tube (61) and the air tube (62).

5. A spray set of gas-assisted atomization, its characterized in that: a spray gun (6) comprising a gas-assisted atomization as claimed in claim 4.

6. The gas-assisted spray device of claim 5, wherein: the plurality of spray guns (6) are uniformly distributed circumferentially and inserted on the side wall of the flue gas pipeline (8); the spray nozzles (7) of each spray gun (6) are all located inside the flue gas pipeline (8), and the air source interface (621) and the liquid source interface (611) are all located outside the flue gas pipeline (8) and are respectively communicated with a gas pipeline and a liquid pipeline.