CN219043397U - Denitration spray gun - Google Patents
Denitration spray gun Download PDFInfo
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- CN219043397U CN219043397U CN202320032645.8U CN202320032645U CN219043397U CN 219043397 U CN219043397 U CN 219043397U CN 202320032645 U CN202320032645 U CN 202320032645U CN 219043397 U CN219043397 U CN 219043397U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model discloses a denitration spray gun, which comprises a denitration pipe body and a nozzle arranged on the denitration pipe body, wherein the denitration pipe body is provided with an axial cavity, a spray hole is arranged in the nozzle, and the spray hole is in fluid communication with the axial cavity; the fluid flow direction in the spray hole is perpendicular to the fluid flow direction in the axial cavity; the fluid inlet area of the orifice is greater than the fluid outlet area of the orifice. According to the utility model, the distance from the fluid inlet end to the tail end of the denitration pipe body to spray the denitration agent is close, so that the uniformity of the denitration agent dispersion is improved; meanwhile, the problem that the design calculation of matching the cross sectional areas of the fluid inlet and the fluid outlet of the nozzle is high in site operation cost is solved.
Description
Technical Field
The utility model relates to the technical field of denitration. In particular to a denitration spray gun.
Background
Industrially, the coke oven tail gas generally requires a denitration treatment to remove nitrogen oxides therein. At present, the selective non-catalytic reduction method SNCR has low equipment investment and low running cost, and is popular with factories and enterprises. The SNCR of the selective non-catalytic reduction method is generally realized by punching holes on a boiler, extending a spray gun into the hearth, spraying a denitration agent into the hearth through the spray gun to perform denitration reaction with flue gas, thereby realizing removal of nitrogen oxides; although the denitration equipment of the method has the advantages of low investment and low operation cost of late denitration compared with a catalytic reduction method, the denitration efficiency is lower, the denitration efficiency is only 50-60%, and for areas with higher emission standard requirements, the SNCR of the selective non-catalytic reduction method cannot reach the emission standard of tail gas, and secondary denitration is often needed.
The patent 202010853955.7 discloses a coke oven denitration pipe and a preparation method, the denitration pipe has the advantages of good thermal shock stability, strong erosion resistance and long service life, long stable operation time can be ensured, the length of the denitration pipe can be adjusted according to the size of a regenerator, the denitration pipe is suitable for denitration of various coke ovens, and the denitration efficiency is higher than that of the SNCR method of the conventional common selective non-catalytic reduction method. For the coke oven denitration tube disclosed in patent 202010853955.7, the following disadvantages also exist in the actual use process: the denitration agent enters a vertical air passage vertical to the internal air passage after being changed along the internal air passage in the horizontal direction, then enters a cross-shaped horizontal air passage from the vertical air passage after being changed, and the horizontal air passage is vertical to the vertical air passage; because the denitration agent is sprayed out after two changes of direction, the sprayed denitration agent has larger pressure loss when passing through the nozzle, the spraying distance is closer, and the spraying distance of the nozzle at the tail end of the denitration tube is closer. In addition, each nozzle is provided with only one vertical air passage communicated with the internal air passage, and four horizontal air passages communicated with the vertical air passages, so that the matching design calculation and the on-site operation cost of the cross sectional area of the vertical air passages and the total cross sectional area of the horizontal air passages are high.
Disclosure of Invention
Therefore, the technical problem to be solved by the utility model is to provide a denitration spray gun, so as to solve the problems of larger pressure loss and closer spraying distance when the denitration agent passes through a nozzle due to two-time direction-changing spraying of the denitration agent in a denitration pipe in the background technology, particularly the problem of closer spraying distance of a nozzle at the tail end of the denitration pipe, and the problem of higher design calculation matching the cross section area of a vertical air passage and the total cross section area of a horizontal air passage and site operation cost.
In order to solve the technical problems, the utility model provides the following technical scheme:
the denitration spray gun comprises a denitration pipe body and a nozzle arranged on the denitration pipe body, wherein the denitration pipe body is provided with an axial cavity, a spray hole is formed in the nozzle, and the spray hole is in fluid communication with the axial cavity; the fluid flow direction in the spray hole is perpendicular to the fluid flow direction in the axial cavity; the fluid inlet area of the nozzle orifice is greater than or equal to the fluid outlet area of the nozzle orifice. The denitration agent in the denitration spray gun can be sprayed out of the spray hole only through one-time direction change, and the one-time direction change spray nozzle has the advantage of small pressure loss, and has small forward flow resistance of fluid transmitted to the axial cavity, so that the denitration liquid supply quantity at the tail end of the denitration pipe body is basically not influenced; and the area of the fluid inlet of the spray hole is larger than or equal to the area of the fluid outlet of the spray hole, so that the spray distance of the spray nozzle is further improved.
Above-mentioned denitration spray gun, the outer terminal surface of nozzle with denitration pipe body surface parallel and level or be less than denitration pipe body surface.
In the denitration spray gun, the fluid inlet area of the spray hole is 1-16 times of the fluid outlet area of the spray hole. If the area of the fluid outlet is too small, the kinetic energy of the denitration agent when being sprayed out of the fluid outlet of the spray hole is too large, so that most of the denitration agent is sprayed to a position far away from the spray hole, and the denitration agent in the area near the spray hole is less sprayed; when the area of the fluid inlet of the spray hole is 1-16 times of the area of the fluid outlet of the spray hole, the denitration agent can be more uniformly sprayed into the regenerator after being sprayed.
Above-mentioned denitration spray gun, the internal diameter of axial cavity is from the fluid entry end of denitration pipe body to the blind end of denitration pipe body diminishes gradually.
The denitration agent in the denitration pipe body can be sprayed out from the spray hole in the nozzle through one diversion when flowing through the nozzle, so that the pressure loss is relatively small when the denitration agent in the denitration pipe body flows from the fluid inlet end of the denitration pipe to the blind end of the denitration pipe (compared with the situation that the denitration agent is sprayed out after flowing into the nozzle through one diversion after flowing into the nozzle again). The pressure loss at the nozzle is small, so that the resistance of the forward flow of the fluid transferred to the axial cavity by the nozzle is small, the supply quantity of the denitration agent at the tail end of the denitration pipe body is basically not influenced, and the supply quantity of the denitration agent at the fluid inlet end of the denitration pipe is basically consistent.
Gradually reducing the inner diameter of the axial cavity from the fluid inlet end of the denitration pipe body to the blind end of the denitration pipe body, so that the fluid pressure at the tail end of the axial cavity is improved, and the fluid pressure in each place in the axial cavity tends to be consistent; reducing the cross-sectional area of axial cavity can improve the flow velocity of the denitration agent far away from the fluid inlet end of the denitration pipe body, can keep higher kinetic energy when guaranteeing the denitration agent to spout from the nozzle, thereby make from the fluid inlet end of the denitration pipe body to the distance of the denitration agent of nozzle blowout between the blind end of denitration pipe body is close, and then has improved the homogeneity that the denitration agent distributes in perpendicular denitration pipe body direction.
Above-mentioned denitration spray gun, from the fluid entry end of denitration pipe body extremely in the direction of the blind end of denitration pipe body, adjacent two on the denitration pipe body the interval of nozzle reduces gradually, just the fluid outlet area of nozzle reduces gradually. The fluid outlet area of the nozzle is gradually reduced to ensure that the denitration agent has higher flow velocity when being sprayed, so that the denitration agent can be sprayed to a longer distance, and meanwhile, the denitration agent sprayed in unit time is reduced due to the gradual reduction of the fluid outlet area of the nozzle, so that the distance between two adjacent nozzles is reduced to increase the density of the nozzles, and the total amount of the denitration agent sprayed from the nozzle between the fluid inlet end of the denitration pipe body and the blind end of the denitration pipe body is uniformly distributed along the direction parallel to the denitration pipe body.
The spray hole of the denitration spray gun is a round table type or prismatic table type cavity; the area of the fluid outlet of the spray hole is 3-10 mm 2 。
The denitration spray gun is characterized in that the spray hole is a prismatic table type cavity, and a fluid outlet of the spray hole is rectangular; the long side of rectangle with the denitration pipe body is parallel.
The denitration spray gun is characterized in that the nozzles are arranged on two sides of the denitration pipe body, and all the nozzles on each side are on the same straight line; the distance between two adjacent nozzles on the same side is 100-400 mm. Two rows of nozzles are arranged on two sides of the denitration pipe body, so that the uniformity of denitration agent injection in two side areas of the denitration pipe body can be ensured.
Above-mentioned denitration spray gun, from the fluid entry end of denitration pipe body to in the direction of the blind end of denitration pipe body: on the denitration pipe body within 1/5 of the total length of the denitration pipe body, the distance between two adjacent nozzles is 400mm, and the area of a fluid outlet of each nozzle is 9mm 2 The method comprises the steps of carrying out a first treatment on the surface of the On the denitration pipe body which is 1/5 to 2/5 of the total length of the denitration pipe body, the distance between two adjacent nozzles is 300mm, and the area of the fluid outlet of the nozzle is 7mm 2 The method comprises the steps of carrying out a first treatment on the surface of the On the denitration pipe body which is 2/5-3/5 of the total length of the denitration pipe body, the distance between two adjacent nozzles is 200mm, and the area of the fluid outlet of the nozzle is 5mm 2 The method comprises the steps of carrying out a first treatment on the surface of the On the denitration pipe body which is 3/5 of the total length of the denitration pipe body to the blind end of the denitration pipe body, the distance between two adjacent nozzles is 100mm, the fluid outlet area of the nozzle is 3.5mm 2 。
The denitration spray gun is characterized in that the spray nozzle is a truncated cone-shaped spray nozzle; the cross-sectional area of the end face of the nozzle adjacent the axial cavity is greater than the cross-sectional area of the end face of the nozzle adjacent the surface of the denitration tube body. The nozzle with the structure is more convenient for plastering fire mud when being installed on the denitration pipe body.
The technical scheme of the utility model has the following beneficial technical effects:
the structure of the denitration pipe body and the nozzle is improved, so that a spray hole in the nozzle is in fluid communication with the axial cavity, and the fluid flow direction in the spray hole is perpendicular to the fluid flow direction in the axial cavity; simultaneously, the inner diameter of a denitration agent channel in the denitration pipe is gradually reduced from a fluid inlet to the tail end, the area of a fluid outlet of a nozzle arranged on the denitration pipe body is gradually reduced, and the distribution density of the nozzle is increased; meanwhile, the area of the fluid inlet of the spray hole is 1-16 times of the area of the fluid outlet of the spray hole, so that the distance from the fluid inlet end to the tail end of the denitration pipe body to spray the denitration agent is close, and the uniformity of the denitration agent dispersion is improved; meanwhile, the problem that the design calculation and the field operation cost are high due to the matching of the cross sectional areas of the fluid inlet and the fluid outlet of the nozzle orifice is solved; the denitration spray gun provided by the utility model can be applied to not only coke ovens, but also other equipment such as power plant boilers.
Drawings
FIG. 1 is a schematic structural view of a denitration tube of the present utility model;
FIG. 2 is a schematic view of the installation of the nozzle of the present utility model on a denitration tube body;
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 showing the structure of a nozzle according to embodiment 2 of the present utility model.
The reference numerals in the drawings are as follows: 1-a denitration pipe body; 2-nozzles; 21-spraying holes; 3-mounting grooves; 4-round table type spray holes; 5-prismatic table type spray hole.
Detailed Description
Example 1
The structure of the denitration pipe in the embodiment is shown in fig. 1, and the denitration pipe comprises a denitration pipe body 1 and a nozzle 2, wherein the nozzle 2 is arranged on the denitration pipe body 1, and an axial cavity is formed in the denitration pipe body 1; as shown in fig. 3, the nozzle 2 has a nozzle hole 21, and the nozzle hole 21 is a cavity with a circular truncated cone shape; the nozzle 21 is in fluid communication with the axial cavity; the fluid flow direction of the spray hole 21 is perpendicular to the axial cavity; the nozzle 2 is a truncated cone type nozzle; the cross-sectional area of the end face of the nozzle 2 adjacent to the axial cavity is larger than the cross-sectional area of the end face of the nozzle 2 adjacent to the surface of the denitration pipe body 1.
The preparation method and the installation method of the denitration pipe body 1 and the nozzle 2 in the embodiment are the same as those of the coke oven denitration pipe disclosed in the patent 202010853955.7, the denitration pipe body also comprises a denitration pipe head, a plurality of middle denitration pipe sections, a denitration tail pipe and a metal joint, the specific structure of the denitration pipe body is shown in the patent 202010853955.7, the structure of the denitration pipe body and the nozzle is improved on the basis of the coke oven denitration pipe in the patent 202010853955.7, and other detailed structures are not repeated here;
as shown in fig. 2, the denitration pipe body 1 is provided with an installation groove 3, and the nozzle 2 is installed on the denitration pipe body 1 through the installation groove 3; the outer end surface of the nozzle 2 is lower than the surface of the denitration pipe body 1; the inner diameter of the axial cavity is gradually reduced from the fluid inlet end of the denitration pipe body 1 to the blind end of the denitration pipe body 1; the inner diameter of the axial cavity at the fluid inlet end of the denitration pipe body 1 is 30mm, and the inner diameter of the axial cavity at the blind end of the denitration pipe body 1 is 25mm;
as shown in fig. 2, the nozzles 2 are installed at both sides of the denitration pipe body 1, and all the nozzles 2 at each side are on the same straight line; in the direction from the fluid inlet end of the denitration pipe body 1 to the blind end of the denitration pipe body 1, the distance between two adjacent nozzles 2 on the same straight line on the denitration pipe body 1 is gradually reduced, and the area of the fluid outlet of the nozzles 2 is gradually reduced;in this embodiment, in the direction from the fluid inlet end of the denitration tube to the blind end of the denitration tube: on the denitration pipe body within 1/5 of the total length of the denitration pipe, the distance between two adjacent nozzles 2 is 400mm, and the fluid outlet area of the nozzles is 9mm 2 The method comprises the steps of carrying out a first treatment on the surface of the On the denitration pipe body with a distance of 1/5-2/5 of the total length of the denitration pipe, the distance between two adjacent nozzles 2 is 300mm, and the area of the fluid outlet of each nozzle is 7mm 2 The method comprises the steps of carrying out a first treatment on the surface of the On the denitration pipe body with the distance of 2/5-3/5 of the total length of the denitration pipe, the distance between two adjacent nozzles 2 is 200mm, and the area of the fluid outlet of each nozzle is 5mm 2 The method comprises the steps of carrying out a first treatment on the surface of the On the denitration pipe body which is 3/5 of the total length of the denitration pipe to the tail end of the denitration pipe, the distance between two adjacent nozzles 2 is 100mm, and the area of the fluid outlet of the nozzles is 3.5mm 2 The method comprises the steps of carrying out a first treatment on the surface of the In this embodiment, the fluid inlet area of the orifices 21 of all the nozzles 2 is 16 times the fluid outlet area of the orifices 21 [ in other embodiments, the fluid inlet area of the orifices 21 of all the nozzles 2 may be 1, 3, 5, 8, 13, etc. times the fluid outlet area of the orifices 21;
under the same process conditions, the denitration pipe of the embodiment is adopted, and compared with the denitration pipe in the patent 202010853955.7 for carrying out coke oven denitration, the denitration efficiency is improved by 13.7 percent on average.
Example 2
The denitration spray gun of this embodiment differs from embodiment 1 only in that the structure of the spray nozzle is as shown in fig. 4, the spray orifice 21 is a prismatic table-shaped cavity, and the fluid outlet of the spray orifice 21 is rectangular; the long side of rectangle with denitration pipe body 1 is parallel. Other structures and parameters were the same as in example 1.
Under the same process conditions, the denitration pipe of the embodiment is adopted, and compared with the denitration pipe in the patent 202010853955.7 for carrying out coke oven denitration, the denitration efficiency is improved by 11.3 percent on average.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While the obvious variations or modifications which are extended therefrom remain within the scope of the claims of this patent application.
Claims (10)
1. The denitration spray gun comprises a denitration pipe body (1) and a nozzle (2) arranged on the denitration pipe body (1), wherein the denitration pipe body (1) is provided with an axial cavity, and the denitration spray gun is characterized in that a spray hole (21) is formed in the nozzle (2), and the spray hole (21) is in fluid communication with the axial cavity; the fluid flow direction in the spray hole (21) is perpendicular to the fluid flow direction in the axial cavity; the fluid inlet area of the nozzle hole (21) is greater than or equal to the fluid outlet area of the nozzle hole (21).
2. The denitration spray gun according to claim 1, characterized in that the outer end face of the nozzle (2) is flush with the surface of the denitration pipe body (1) or lower than the surface of the denitration pipe body (1).
3. A denitration spray gun according to claim 1, characterized in that the fluid inlet area of the spray orifice (21) is 1-16 times the fluid outlet area of the spray orifice (21).
4. The denitration spray gun according to claim 1, characterized in that the inner diameter of the axial cavity is gradually reduced from the fluid inlet end of the denitration pipe body (1) to the blind end of the denitration pipe body (1).
5. A denitration spray gun according to claim 4, characterized in that the distance between two adjacent nozzles (2) on the denitration pipe body (1) is gradually reduced in the direction from the fluid inlet end of the denitration pipe body (1) to the blind end of the denitration pipe body (1), and the fluid outlet area of the nozzles (2) is gradually reduced.
6. The denitration spray gun according to claim 5, characterized in that the spray hole (21) is a truncated cone-shaped spray hole (4) or a prismatic truncated cone-shaped spray hole (5); the fluid outlet area of the spray hole (21) is 3-10 mm 2 。
7. The denitration spray gun according to claim 6, characterized in that the spray orifice (21) is a prismatic table-shaped cavity, and the fluid outlet of the spray orifice (21) is rectangular; the long side of the rectangle is parallel to the denitration tube body (1).
8. The denitration spray gun according to claim 6, characterized in that the nozzles (2) are mounted on both sides of the denitration pipe body (1), and all the nozzles (2) on each side are on the same straight line; the distance between two adjacent nozzles (2) on the same side is 100-400 mm.
9. The denitration spray gun according to claim 8, characterized in that in the direction from the fluid inlet end of the denitration tube body (1) to the blind end of the denitration tube body (1): on the denitration pipe body (1) within 1/5 of the total length of the denitration pipe body (1), the distance between two adjacent nozzles (2) is 400mm, and the area of a fluid outlet of each nozzle (2) is 9mm 2 The method comprises the steps of carrying out a first treatment on the surface of the On the denitration pipe body (1) which is 1/5-2/5 of the total length of the denitration pipe body (1), the distance between two adjacent nozzles (2) is 300mm, and the area of a fluid outlet of each nozzle (2) is 7mm 2 The method comprises the steps of carrying out a first treatment on the surface of the On the denitration pipe body (1) which is 2/5-3/5 of the total length of the denitration pipe body (1), the distance between two adjacent nozzles (2) is 200mm, and the area of a fluid outlet of each nozzle (2) is 5mm 2 The method comprises the steps of carrying out a first treatment on the surface of the On the denitration pipe body (1) from 3/5 of the total length of the denitration pipe body (1) to the blind end of the denitration pipe body (1), the distance between two adjacent nozzles (2) is 100mm, and the area of a fluid outlet of each nozzle (2) is 3.5mm 2 。
10. Denitration spray gun according to claim 1, characterized in that the nozzle (2) is a truncated cone nozzle; the cross-sectional area of the end face of the nozzle (2) adjacent to the axial cavity is larger than the cross-sectional area of the end face of the nozzle (2) adjacent to the surface of the denitration pipe body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320032645.8U CN219043397U (en) | 2023-01-06 | 2023-01-06 | Denitration spray gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320032645.8U CN219043397U (en) | 2023-01-06 | 2023-01-06 | Denitration spray gun |
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| Publication Number | Publication Date |
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| CN219043397U true CN219043397U (en) | 2023-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320032645.8U Active CN219043397U (en) | 2023-01-06 | 2023-01-06 | Denitration spray gun |
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| CN (1) | CN219043397U (en) |
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2023
- 2023-01-06 CN CN202320032645.8U patent/CN219043397U/en active Active
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