CN215964212U

CN215964212U - Long-neck type urea solution high-temperature atomizing nozzle for jetting against gravity

Info

Publication number: CN215964212U
Application number: CN202122238384.9U
Authority: CN
Inventors: 李明皓; 王晓冰; 董陈; 白永岗; 鲁晓宇; 周科; 罗志
Original assignee: Xian Thermal Power Research Institute Co Ltd
Current assignee: Xian Thermal Power Research Institute Co Ltd
Priority date: 2021-09-15
Filing date: 2021-09-15
Publication date: 2022-03-08
Anticipated expiration: 2031-09-15

Abstract

The utility model discloses a long-neck type urea solution high-temperature atomizing nozzle for jetting against gravity, which comprises a conveying cap, a mixing cap, a blowing cap and a pressing cap, wherein the conveying cap is arranged on the mixing cap; the blowing cap is sleeved on the outer side of the mixing cap, a blowing air channel is formed between the blowing cap and the mixing cap, the mixing cap is of a hollow structure, the center of the mixing cap is used as a fog drop channel, the conveying cap is inserted into the mixing cap, a urea solution channel and a compressed air channel are arranged in the conveying cap, a plurality of through holes are formed in the side wall of the mixing cap, the outlet of the compressed air channel is divided into two paths, one path of the compressed air channel is communicated with the blowing air channel through the through holes, the other path of the compressed air channel is communicated with the fog drop channel, the urea solution channel is communicated with the fog drop channel, the outer wall of the blowing cap is connected with the outer wall of the conveying cap through the pressing cap, the nozzle can maintain the lower through-flow temperature of liquid, eliminates the adverse influence of the working condition of counter-gravity, and can be adapted to the high-temperature smoke environment.

Description

Long-neck type urea solution high-temperature atomizing nozzle for jetting against gravity

Technical Field

The utility model belongs to the technical field of liquid atomization, and relates to a long-neck type high-temperature urea solution atomizing nozzle capable of spraying against gravity.

Background

The liquid atomizing and spraying nozzle is commonly used for introducing key process media into a system in the industrial field, and is mainly characterized by being capable of dispersing and atomizing liquid, and being beneficial to mixing the liquid with other media in the system more quickly and uniformly so as to achieve better heat transfer and mass transfer effects. The most key performance of the liquid atomizing and spraying nozzle is the atomizing and spraying effect of the liquid atomizing and spraying nozzle on a specific medium under a specific working condition, such as parameters of the minimum particle size of liquid drops, the spraying angle of the liquid drops and the like. In addition, considering the influence of physical and chemical characteristics and the spraying direction (gravity factor) of the original medium around the nozzle, under different application scenes, the appearance structure of the liquid atomizing nozzle is greatly different and is often required to be specially designed according to specific working conditions, otherwise, various operation faults are easily generated, the process effect is influenced, and even parts are permanently damaged.

In a boiler flue gas denitration device, a urea solution is commonly used as a reducing agent for a denitration process, and the urea solution is atomized and sprayed into high-temperature dust-containing flue gas, and is fully mixed with the flue gas and subjected to a chemical reaction. In practical application, because the urea solution has the characteristic of higher crystallization temperature point, if the temperature of the liquid is too high in the through-flow process inside the nozzle, the phenomenon of crystallization and blockage of an internal flow passage is easy to occur. Similarly, if the retention condition of liquid drops appears on the outer wall surface of the spray nozzle, the liquid drops can be instantly crystallized under the high-temperature smoke working condition, and the phenomenon of gradual accumulation of crystals appears to influence the atomization effect. In addition, flue gas denitration devices often have a baffled flue section, and urea solution injection points are often located in the vertical section of this flue region. The flue gas in the area flows from bottom to top, and the atomized spraying of the urea solution is under the condition of counter-gravity, namely the spraying direction is opposite to the gravity direction. At this time, the sprayed liquid drops are influenced by gravity, so that a backflow area is easy to appear, and the situation of 'splashing' is easy to appear, so that urea crystals are easy to appear on the surfaces of the nozzle and the peripheral components.

In conclusion, the atomizing nozzle capable of maintaining the lower through-flow temperature of the liquid and eliminating the adverse effect of the antigravity working condition can more effectively meet the requirement of atomizing and spraying the urea solution in the high-temperature smoke environment.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provides a long-neck type urea solution high-temperature atomizing nozzle for jetting against gravity, which can maintain the lower through-flow temperature of liquid, eliminate the adverse effect of the working condition of against gravity and adapt to the high-temperature smoke environment.

In order to achieve the aim, the high-temperature atomizing nozzle for spraying the long-neck urea solution against gravity comprises a conveying cap, a mixing cap, a blowing cap and a pressing cap;

the blowing cap is sleeved outside the mixing cap, a blowing air channel is formed between the blowing cap and the mixing cap, the mixing cap is of a hollow structure, the center of the mixing cap is used as a fog drop channel, the conveying cap is inserted into the mixing cap, a urea solution channel and a compressed air channel are arranged in the conveying cap, a plurality of through holes are formed in the side wall of the mixing cap, an outlet of the compressed air channel is divided into two paths, one path of the compressed air channel is communicated with the blowing air channel through the through holes, the other path of the compressed air channel is communicated with the fog drop channel, the urea solution channel is communicated with the fog drop channel, and the outer wall of the blowing cap is connected with the outer wall of the conveying cap through the compressing cap.

The central lines of the conveying cap, the mixing cap and the blowing cap are overlapped.

The inner wall of the pressing cap is provided with a first internal thread and a second internal thread, the outer wall of the blowing cap is provided with a first external thread matched with the first internal thread, and the outer wall of the conveying cap is provided with a second external thread matched with the second internal thread.

The lower side of the fog drop channel is of a contraction structure, and the through hole is formed in the side wall of the contraction structure.

The upper side of the mist channel is of a cylindrical structure with a diameter D7, wherein the length of the upper side of the mist channel is L, wherein L >5 × D7.

The outer wall surface of the blowing cap is in a hyperbolic structure.

Be provided with first boss on compressing tightly the inner wall of cap, be provided with the second boss on the outer wall of sweeping the cap, compress tightly the cap and sweep cap threaded connection back, first boss and second boss contact.

All the through holes are uniformly distributed along the circumferential direction.

The utility model has the following beneficial effects:

when the long-neck type urea solution high-temperature atomizing nozzle is in specific operation, part of compressed air enters the fog drop channel to atomize the urea solution to form fog drops, and the other part of compressed air enters the blowing air channel through the through holes to serve as blowing air, and the blowing air can play a role in stabilizing the temperature of a gas-liquid mixed flow in the fog drop channel.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the locking cap 4 of the present invention;

FIG. 3 is a schematic structural view of the purge cap 3 according to the present invention;

FIG. 4 is a schematic structural view of the mixing cap 2 of the present invention;

fig. 5 is a schematic structural view of the delivery cap 1 of the present invention.

Wherein, 1 is a conveying cap, 2 is a mixing cap, 3 is a blowing cap, 4 is a pressing cap, 5 is a urea solution channel, 6 is a compressed air channel, 7 is a contraction structure, 8 is a second external thread, 9 is a fog drop channel, 10 is a blowing air channel, and 11 is a through hole.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the utility model. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.

Referring to fig. 1 to 5, the high-temperature atomizing nozzle for the counter-gravity spraying long-neck type urea solution of the utility model comprises a conveying cap 1, a mixing cap 2, a blowing cap 3 and a pressing cap 4, wherein, the blowing cap 3 is sleeved outside the mixing cap 2, a blowing air channel 10 is formed between the blowing cap 3 and the mixing cap 2, the mixing cap 2 is of a hollow structure, the center of the mixing cap 2 is used as a fog drop channel 9, the conveying cap 1 is inserted into the mixing cap 2, a urea solution channel 5 and a compressed air channel 6 are arranged in the conveying cap 1, a plurality of through holes 11 are arranged on the side wall of the mixing cap 2, the outlet of the compressed air channel 6 is divided into two channels, one path is communicated with the blowing air channel 10 through the through hole 11, the other path is communicated with the fogdrop channel 9, the urea solution channel 5 is communicated with the fogdrop channel 9, and the outer wall of the blowing cap 3 is connected with the outer wall of the conveying cap 1 through the pressing cap 4.

The center lines of the conveying cap 1, the mixing cap 2 and the blowing cap 3 are overlapped, the inner wall of the pressing cap 4 is provided with a first internal thread and a second internal thread, the outer wall of the blowing cap 3 is provided with a first external thread matched with the first internal thread, and the outer wall of the conveying cap 1 is provided with a second external thread 8 matched with the second internal thread.

Along the flowing direction of the urea solution, the lower side of the fog drop channel 9 is a contraction structure 7, the through hole 11 is arranged on the side wall of the contraction structure 7, the upper side of the fog drop channel 9 is a cylindrical structure with the diameter of D7, wherein the length of the upper side of the fog drop channel 9 is L, wherein L is more than 5 multiplied by D7, namely, the mixing cap 2 adopts a long neck structure, so that the staying time of a gas-liquid mixture (urea fog drops) in a nozzle can be prolonged, the fog drops with larger radial velocity components can undergo a 'wall collision-scouring' process as much as possible, the axial velocity components of the sprayed fog drops are increased to the maximum extent, the spray angle characteristic of the fog drops is improved, and the probability of splashing of the fog drops under the working condition of counter-gravity is reduced.

Part of the compressed air enters the blowing air channel 10 through the through hole 11 to serve as blowing air, and meanwhile, the temperature stabilizing effect can be achieved on the gas-liquid mixed flow in the fog drop channel 9, so that the blowing air is located around the fog drops when the high-temperature flue gas spraying nozzle is in operation under the working condition of high-temperature flue gas, the wrapping air is formed around the fog drops, the rigidity of the fog drop flow is improved, the fog drops are prevented from flowing out of a backflow site, splashing of the fog drops is reduced, and long-term stable operation of the nozzle is guaranteed.

The outer wall of the blowing cap 3 is of a hyperbolic structure, so that the overall appearance of the nozzle is streamline, the turbulent flow effect of the nozzle on flue gas is reduced, the phenomena of dust deposition and local overtemperature around the nozzle are avoided, and the stability of the overall operation of the nozzle in high-speed flue gas flow is improved.

Be provided with first boss on compressing tightly the inner wall of cap 4, be provided with the second boss on the outer wall of sweeping cap 3, compress tightly cap 4 and sweep cap 3 threaded connection back, first boss and second boss contact.

During operation, urea solution moves upwards through the urea solution channel 5 and enters the fog drop channel 9, compressed air is divided into two paths through the compressed air channel 6, one path of the compressed air enters the fog drop channel 9, the other path of the compressed air serves as blowing air and enters the blowing air channel 10 through the through hole 11, the urea solution and the compressed air are mixed to form fog drops in the fog drop channel 9, then the fog drops are sprayed into the area A, and meanwhile blowing air in the blowing air channel 10 is sprayed out, wherein the blowing air is located around the fog drops, so that the fog drops are wrapped by the blowing air to eliminate possible fog drop backflow and splash phenomena in the area B, and even under the working condition of counter-gravity, the annular blowing air still has an obvious effect to thoroughly avoid the adhesion of the urea fog drops on the periphery of the nozzle to form crystals and influence the operation stability of the nozzle.

The utility model skillfully forms the gas-liquid atomization injection flow channel with complete functions by utilizing four through-flow components with simple structures and convenient processing. Through the flowing organization to gas, liquid, form the droplet jet flow that has less injection angle and stronger rigidity, effectively avoid the backward flow of droplet, splash the phenomenon, furthest's elimination adverse gravity operating mode is to atomizing the influence of spraying, and it is simple to make, convenient to use, the dependable performance is particularly useful for the atomizing of urea solution in high temperature flue gas stream and sprays the application, provides brand-new technical method and product scheme for the injection apparatus of flue gas denitration system reductant, reasonable in design, and the structure is ingenious, safe and reliable, and the practicality is strong, high-efficient environmental protection.

Claims

1. A long-neck type urea solution high-temperature atomizing nozzle for jetting against gravity is characterized by comprising a conveying cap (1), a mixing cap (2), a blowing cap (3) and a pressing cap (4);

the blowing cap (3) is sleeved on the outer side of the mixing cap (2), a blowing air channel (10) is formed between the blowing cap (3) and the mixing cap (2), the mixing cap (2) is of a hollow structure, the center of the mixing cap (2) is used as a fog drop channel (9), the conveying cap (1) is inserted into the mixing cap (2), a urea solution channel (5) and a compressed air channel (6) are arranged in the conveying cap (1), a plurality of through holes (11) are arranged on the side wall of the mixing cap (2), the outlet of the compressed air channel (6) is divided into two channels, one path is communicated with the blowing air channel (10) through the through hole (11), the other path is communicated with the fog drop channel (9), the urea solution channel (5) is communicated with the fog drop channel (9), and the outer wall of the blowing cap (3) is connected with the outer wall of the conveying cap (1) through the pressing cap (4).

2. The nozzle for high-temperature atomization of urea solution in long neck type by spraying against gravity according to claim 1, characterized in that the centerlines of the delivery cap (1), the mixing cap (2) and the purge cap (3) coincide.

3. The nozzle for high-temperature atomization of urea solution in long neck type by spraying against gravity according to claim 1, characterized in that the inner wall of the hold-down cap (4) is provided with a first internal thread and a second internal thread, the outer wall of the purge cap (3) is provided with a first external thread matching with the first internal thread, and the outer wall of the delivery cap (1) is provided with a second external thread (8) matching with the second internal thread.

4. A nozzle for high-temperature atomization of urea solution in the form of a long-neck with counter-gravity injection according to claim 1, characterized in that the lower side of the mist channel (9) presents a constriction (7), and the through-hole (11) opens onto the side wall of said constriction (7).

5. The nozzle for high-temperature atomization of urea solution with long neck for spraying against gravity according to claim 1, characterized in that the upper side of the mist channel (9) is a cylindrical structure with a diameter D7, wherein the length of the upper side of the mist channel (9) is L, wherein L >5 x D7.

6. The high-temperature atomizing nozzle for the counter-gravity spraying long-neck type urea solution is characterized in that the outer wall surface of the blowing cap (3) is in a hyperbolic structure.

7. The nozzle for high-temperature atomization of a long-neck urea solution sprayed against gravity according to claim 1, characterized in that a first boss is provided on the inner wall of the compressing cap (4), a second boss is provided on the outer wall of the purging cap (3), and the first boss and the second boss are in contact after the compressing cap (4) and the purging cap (3) are in threaded connection.

8. A high-temperature atomizing nozzle for urea solution of the countergravity injection long-neck type according to claim 1, characterized in that the through holes (11) are uniformly distributed in the circumferential direction.