CN214635377U - Ammonia spraying device and flue gas denitration device - Google Patents
Ammonia spraying device and flue gas denitration device Download PDFInfo
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- CN214635377U CN214635377U CN202120574694.5U CN202120574694U CN214635377U CN 214635377 U CN214635377 U CN 214635377U CN 202120574694 U CN202120574694 U CN 202120574694U CN 214635377 U CN214635377 U CN 214635377U
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- ammonia
- flue
- flue gas
- ammonia spraying
- ammonia injection
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Abstract
The utility model relates to an environmental protection technology field, concretely relates to spout ammonia device, flue gas denitration device, spout the ammonia device and include: the ammonia spraying pipeline is suitable for being horizontally arranged in the flue, the cross section of the ammonia spraying pipeline is oval, the minor axis of the oval is perpendicular to the flow direction of flue gas in the flue, and the major axis of the oval is parallel to the flow direction of the flue gas in the flue; and the nozzle is arranged on the ammonia spraying pipeline. Because the minor axis is perpendicular with the flue gas flow direction, under the unchangeable prerequisite of ammonia spraying pipeline length, the projected area of ammonia spraying pipeline is the product of the length of minor axis and the length of ammonia spraying pipeline, can reduce greatly, and the area that blocks to the flue gas reduces, has both guaranteed the deamination efficiency of system, effectively reduces system resistance, has increased the route and the area of mass transfer again, has improved deamination efficiency. In addition, due to the oval shape, the smoke flow guide device can guide the flow of smoke, the smoke flow is smooth, and the abrasion to the ammonia spraying pipeline is small.
Description
Technical Field
The utility model relates to an environmental protection technology field, concretely relates to spout ammonia device, flue gas denitrification facility.
Background
At present, a power plant carries out a new round of ultra-low emission modification project, and relates to modification and replacement of a large number of flue gas denitration devices. The improved or newly-built denitration reactor is provided with a plurality of ammonia spraying devices at the vertical section of the reactor for spraying ammonia gas, and the ammonia gas reacts with nitrogen oxides in flue gas in the reactor to remove the nitrogen oxides. The existing ammonia spraying device is made of a round steel pipe, holes are formed in the round pipe, and nozzles at different angles are welded in a cross mode to achieve ammonia spraying coverage.
The pipelines for spraying ammonia are arranged in parallel in the flue side by side, the projection area of the pipelines almost occupies half of the cross-sectional area of the whole flue, the effective cross section through which flue gas can pass is reduced, and the resistance and the energy consumption of the system are greatly increased.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming the great defect of denitration ammonia injection device resistance among the prior art to provide a can reduce ammonia injection device, flue gas denitrification facility of resistance.
In order to solve the technical problem, the utility model provides a pair of spout ammonia device, include:
the ammonia spraying pipeline is suitable for being horizontally arranged in the flue, the cross section of the ammonia spraying pipeline is oval, the minor axis of the oval is perpendicular to the flow direction of flue gas in the flue, and the major axis of the oval is parallel to the flow direction of the flue gas in the flue;
and the nozzle is arranged on the ammonia spraying pipeline.
Optionally, the length ratio of the long axis to the short axis is A, and A is more than 1 and less than or equal to 30.
Optionally, the nozzle is disposed at a position near the bottom end of the ammonia injection pipe.
Optionally, the nozzles are uniformly and alternately arranged on two sides of the ammonia spraying pipeline close to the bottom end.
Optionally, the nozzle is arranged obliquely on the ammonia injection pipeline.
Optionally, the included angle between the central line of the nozzle and the vertical plane is B, and B is more than or equal to 15 degrees and less than or equal to 50 degrees.
Optionally, one end of the ammonia injection pipeline, which is located in the flue, is connected with a connecting piece, and the connecting piece is suitable for being connected with a fixed beam in the flue.
Optionally, the connecting piece is an angle steel.
The utility model also provides a flue gas denitration device, include ammonia spraying device, flue, the ammonia spraying pipeline is established horizontally in the flue.
Optionally, the ammonia injection pipeline is provided with a plurality of pipelines, and the pipelines are arranged in the flue side by side.
The utility model discloses technical scheme has following advantage:
1. the utility model provides an ammonia spraying device, when spouting the ammonia piping erection in the flue, spout the ammonia pipeline and set up horizontally in the flue, the minor axis of the cross section of ammonia pipeline is perpendicular with flue gas flow direction in the flue, the major axis parallels with flue gas flow direction in the flue, under the prerequisite that oval cross sectional area that spouts the ammonia pipeline equals with prior art circular cross sectional area, also under the unchangeable condition of ammonia flow, because minor axis and flue gas flow direction are perpendicular, under the unchangeable prerequisite of ammonia pipeline length, the projection area who spouts the ammonia pipeline is the product of the length of minor axis and the length of spouting the ammonia pipeline, can reduce greatly, the area that blocks to the flue gas reduces, the deamination efficiency of system has both been guaranteed, effectively reduce the system resistance, the way and the area of mass transfer have been increased again, deamination efficiency is improved. The reduction of the system resistance can realize energy conservation; the ammonia removal efficiency is improved, so that the using amount of ammonia water can be saved. Meanwhile, the bending resistance of the oval ammonia spraying pipeline is superior to that of a round pipeline with the same section, and the deformation is smaller. In addition, due to the oval shape, the smoke flow guide device can guide the flow of smoke, the smoke flow is smooth, and the abrasion to the ammonia spraying pipeline is small.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a plan view of an ammonia injection device provided in example 1 of the present invention;
fig. 2 is a cross-sectional view taken at a-a shown in fig. 1.
Description of reference numerals:
1. an ammonia spraying pipeline; 2. a minor axis; 3. a long axis; 4. and (4) a nozzle.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Example 1
At present, a power plant carries out a new round of ultra-low emission modification project, and relates to modification and replacement of a large number of flue gas denitration devices. The improved or newly-built denitration reactor is provided with a plurality of ammonia spraying devices at the vertical section of the reactor for spraying ammonia gas, and the ammonia gas reacts with nitrogen oxides in flue gas in the reactor to remove the nitrogen oxides. The existing ammonia spraying device is made of a round steel pipe, holes are formed in the round pipe, and nozzles at different angles are welded in a cross mode to achieve ammonia spraying coverage. The pipelines for spraying ammonia are arranged in parallel in the flue side by side, the projection area of the pipelines almost occupies half of the cross-sectional area of the whole flue, the effective cross section through which flue gas can pass is reduced, and the resistance and the energy consumption of the system are greatly increased.
Therefore, the embodiment provides an ammonia injection device. In one embodiment, the ammonia injection device comprises an ammonia injection pipeline 1 and a nozzle 4.
The ammonia spraying pipeline 1 is suitable for being horizontally arranged in a flue, the cross section of the ammonia spraying pipeline 1 is oval, the minor axis 2 of the oval is perpendicular to the flow direction of flue gas in the flue, and the major axis 3 of the oval is parallel to the flow direction of the flue gas in the flue; the nozzle 4 is arranged on the ammonia spraying pipeline 1.
In the present embodiment, when the ammonia injection pipeline 1 is installed in the flue, the ammonia injection pipeline 1 is horizontally disposed in the flue, with reference to fig. 1 and 2, the direction indicated by the arrow in fig. 2 is the flue gas flowing direction in the flue, the minor axis 2 of the cross section of the ammonia injection pipeline 1 is perpendicular to the flue gas flowing direction in the flue, and the major axis 3 is parallel to the flue gas flowing direction in the flue, on the premise that the elliptical cross section area of the ammonia injection pipeline 1 is equal to the circular cross section area in the prior art, that is, under the condition that the ammonia injection flow is not changed, because the minor axis 2 is perpendicular to the flue gas flowing direction, on the premise that the length of the ammonia injection pipeline 1 is not changed, the projection area of the ammonia injection pipeline 1 is the product of the length of the minor axis 2 and the length of the ammonia injection pipeline 1, which can be greatly reduced, the blocking area of the flue gas is reduced, both the deamination efficiency of the system and the system resistance are effectively reduced, but also increases the path and area of mass transfer and improves the deamination efficiency. The reduction of the system resistance can realize energy conservation; the ammonia removal efficiency is improved, so that the using amount of ammonia water can be saved. Meanwhile, the bending resistance of the oval ammonia spraying pipeline 1 is superior to that of a round pipeline with the same section, and the deformation is smaller. In addition, due to the oval shape, the smoke flow can be guided, the smoke flow is smooth, and the abrasion to the ammonia spraying pipeline 1 is small.
Specifically, the cross-sectional area of the ammonia spraying pipe 1 is calculated according to the process requirements, then the lengths of the long axis 3 and the short axis 2 are converted according to the area, the ratio of the long axis 3 to the short axis 2 is determined according to the requirements, and the ammonia spraying pipe 1 can be formed by welding steel plates.
In a preferred embodiment, the ratio of the length of the major axis 3 to the length of the minor axis 2 is A, 1 < A.ltoreq.30. On the premise of a certain cross-sectional area, the larger the value A, the longer the major axis 3 and the shorter the minor axis 2, and on the premise of ensuring the bending resistance of the ammonia spraying pipeline 1, the major axis 3 and the minor axis 2 with larger values A are preferably adopted.
In a preferred embodiment, the value of a is 30. In an alternative embodiment, the value of a is 20 or 15.
On the basis of the above embodiments, in a preferred embodiment, the nozzle 4 is arranged at a position close to the bottom end of the ammonia injection pipe 1. Specifically, the bottom end of the ammonia injection pipe 1 refers to the position of the sharp point at the bottom. In this embodiment, set up nozzle 4 in the position department that spouts ammonia pipeline 1 and be close to the bottom, can all spout the aqueous ammonia in spouting ammonia pipeline 1, avoid spouting ammonia pipeline 1 and have the waste that remains and cause the aqueous ammonia. In other alternative embodiments, the nozzles 4 may be provided on both sides of the ammonia injection pipe 1 near the top end, or on both sides of the ammonia injection pipe 1 near the top end and both sides near the top end.
On the basis of the above embodiments, in a preferred embodiment, the nozzles 4 are uniformly and alternately arranged on both sides of the ammonia injection pipeline 1 near the bottom end. In this embodiment, with nozzle 4 in spout the even setting in turn of both sides that is close to the bottom of ammonia pipeline 1, can make even the spouting of aqueous ammonia to the flue in, avoid causing the waste of aqueous ammonia. In other alternative embodiments, the nozzles 4 may be arranged symmetrically and uniformly on both sides of the ammonia injection pipe 1 near the bottom end.
In addition to the above embodiments, in a preferred embodiment, the nozzle 4 is provided obliquely to the ammonia injection. In the present embodiment, the ammonia injection pipe 1 is provided with the nozzle 4 inclined, so that the range of ammonia injection is wide, and the efficiency of ammonia removal can be improved. In other alternative embodiments, the nozzles 4 may be horizontally or vertically disposed on both sides of the ammonia spraying pipe 1 near the bottom end, and the ammonia water is sprayed vertically through the nozzles 4 horizontally spraying out of the fire.
On the basis of the above embodiments, in a preferred embodiment, the included angle between the center line of the nozzle 4 and a vertical plane is B, wherein B is more than or equal to 15 degrees and less than or equal to 50 degrees, and specifically, the vertical plane is a plane where the long axis 3 is positioned and is perpendicular to the cross section.
On the basis of the above embodiments, in a preferred embodiment, one end of the ammonia injection pipeline 1, which is located in the flue, is connected with a connecting piece, and the connecting piece is suitable for being connected with a fixed beam in the flue. In this embodiment, the connector is provided to facilitate connection with the fixed beam within the flue.
In one embodiment, the connecting member is an angle iron. Specifically, an angle steel is welded at the end of the ammonia spraying pipeline 1, and holes are formed in the angle steel, so that the angle steel is connected with the fixed beam through bolts. In other alternative embodiments, the connectors may take on other shaped configurations.
Example 2
The embodiment provides a flue gas denitration device, which comprises the ammonia injection device and a flue, wherein an ammonia injection pipeline 1 of the ammonia injection device is horizontally arranged in the flue. Because the minor axis 2 of the cross section of ammonia spraying pipeline 1 is perpendicular with flue gas flow direction in the flue, major axis 3 parallels with flue gas flow direction in the flue, under the prerequisite that the oval cross sectional area of ammonia spraying pipeline 1 equals with circular cross sectional area among the prior art, also under the unchangeable condition of ammonia spraying flow, because minor axis 2 is perpendicular with flue gas flow direction, under the prerequisite that ammonia spraying pipeline 1 length is unchangeable, the projection area of ammonia spraying pipeline 1 can reduce greatly, the area of blockking to the flue gas reduces, flue gas denitrification facility's deamination efficiency has both been guaranteed, effectively reduce flue gas denitrification facility's resistance, the way and the area of mass transfer have been increased again, deamination efficiency has been improved. The energy conservation can be realized by reducing the resistance of the flue gas denitration device; the ammonia removal efficiency is improved, so that the using amount of ammonia water can be saved.
In a preferred embodiment, a plurality of ammonia injection pipes 1 are arranged in the flue and are arranged side by side in the flue. In the embodiment, the ammonia water is sprayed simultaneously by the plurality of ammonia spraying pipelines 1, so that the deamination efficiency can be ensured, the nitrogen oxides in the flue gas in the flue are obviously reduced, and the pollution to the environment is less.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (10)
1. An ammonia sparger, comprising:
the ammonia spraying pipeline (1) is suitable for being horizontally arranged in a flue, the cross section of the ammonia spraying pipeline (1) is oval, the minor axis (2) of the oval is perpendicular to the flow direction of flue gas in the flue, and the major axis (3) of the oval is parallel to the flow direction of the flue gas in the flue;
and the nozzle (4) is arranged on the ammonia spraying pipeline (1).
2. An ammonia injection device according to claim 1, characterized in that the ratio of the length of the major axis (3) to the minor axis (2) is A, 1 < A ≦ 30.
3. An ammonia injection device according to claim 1, wherein the nozzle (4) is arranged in the ammonia injection pipe (1) near the bottom end.
4. An ammonia injection device according to claim 3, wherein the nozzles (4) are arranged alternately and uniformly on both sides of the ammonia injection pipe (1) near the bottom end.
5. An ammonia injection device according to claim 4, characterized in that the nozzle (4) is arranged obliquely on the ammonia injection pipe (1).
6. An ammonia injection device according to claim 5, characterized in that the angle between the centre line of the nozzle (4) and the vertical plane is B, 15 ° ≦ B ≦ 50 °.
7. An ammonia injection device according to claim 5, characterized in that the end of the ammonia injection pipe (1) inside the flue is connected with a connector, which is adapted to be connected with a fixed beam inside the flue.
8. The ammonia injection unit of claim 7, wherein the connector is an angle iron.
9. A flue gas denitration device, which is characterized by comprising the ammonia injection device and a flue of any one of claims 1 to 8, wherein the ammonia injection pipeline (1) is horizontally arranged in the flue.
10. The flue gas denitration device according to claim 9, wherein the ammonia injection pipeline (1) is provided in plurality and arranged side by side in the flue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120574694.5U CN214635377U (en) | 2021-03-19 | 2021-03-19 | Ammonia spraying device and flue gas denitration device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120574694.5U CN214635377U (en) | 2021-03-19 | 2021-03-19 | Ammonia spraying device and flue gas denitration device |
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| CN214635377U true CN214635377U (en) | 2021-11-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112870960A (en) * | 2021-03-19 | 2021-06-01 | 中国华电科工集团有限公司 | Ammonia spraying device and flue gas denitration device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112870960A (en) * | 2021-03-19 | 2021-06-01 | 中国华电科工集团有限公司 | Ammonia spraying device and flue gas denitration device |
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