CN210125284U

CN210125284U - Ammonia injection grid device for denitration

Info

Publication number: CN210125284U
Application number: CN201920817219.9U
Authority: CN
Inventors: 卢秀清; 王立华; 罗志强; 程世宇; 李晓鹏
Original assignee: Ji'nan Gengao Environmental Protection Equipment Co
Current assignee: Ji'nan Gengao Environmental Protection Equipment Co
Priority date: 2019-05-31
Filing date: 2019-05-31
Publication date: 2020-03-06
Anticipated expiration: 2029-05-31

Abstract

The utility model discloses an ammonia spraying grid device for denitration, which comprises an ammonia spraying mother pipe and a first branch pipe, wherein the first branch pipe is uniformly arranged along the axis direction of the ammonia spraying mother pipe, the ammonia spraying mother pipe is communicated with the first branch pipe, the first branch pipe is provided with a second branch pipe, the first branch pipe is communicated with the second branch pipe, the second branch pipe is provided with a third branch pipe, the second branch pipe is communicated with the third branch pipe, and the third branch pipe is uniformly arranged along the axis direction of the second branch pipe; the spray nozzles are arranged at the upper ends of the third branch pipes, two rows of spray nozzles are arranged on each third branch pipe and distributed in a staggered mode, a baffle is arranged at the upper end of each spray nozzle, a net cover is arranged on each baffle, and a cleaning system is arranged on each third branch pipe. The nozzle is evenly distributed, ammonia and flue gas misce bene, and the flue gas after the mixture fully reacts behind the catalyst, improves the efficiency of denitration, and ammonia distributes the equipartition simultaneously, can not produce the escape, the environmental protection.

Description

Ammonia injection grid device for denitration

Technical Field

The utility model belongs to the technical field of denitration equipment technique and specifically relates to an ammonia injection grid device is used in denitration.

Background

With the increasingly perfect national environmental protection policy, the emission of nitrogen oxides is increasingly emphasized, and a selective reducing agent (SCR) and a non-selective reducing agent (SNCR) and a denitration method using the SCR and the SNCR in a mixed manner are generally adopted for treating the nitrogen oxides in a coal-fired power plant, wherein the SCR denitration technology becomes the most widely applied technology at home and abroad due to the advantages of high denitration efficiency, low reaction temperature, high equipment utilization rate and the like.

However, in actual operation, there are the following problems: 1. the problems of uneven ammonia distribution, inaccurate control of spraying amount, impure supplied ammonia and the like cause the corrosion and blockage of pipelines, 2, the uneven ammonia distribution can cause partial NOX in a flue not to react with the ammonia, the emission concentration of the NOX at a denitration outlet exceeds the standard, the ammonia which does not participate in the reaction is directly discharged from flue gas, and the escape of the ammonia at the outlet is excessive, thereby causing the secondary pollution of air.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve the above-mentioned problem, provide an ammonia injection grid device for denitration, ammonia evenly distributed in the flue guarantees flue gas and ammonia intensive mixing, improves the efficiency of denitration.

The utility model provides a technical scheme that its technical problem adopted is:

an ammonia spraying grid device for denitration comprises an ammonia spraying main pipe and first branch pipes, wherein the first branch pipes are uniformly arranged along the axis direction of the ammonia spraying main pipe, the ammonia spraying main pipe is communicated with the first branch pipes, the first branch pipes are provided with second branch pipes, the first branch pipes are communicated with the second branch pipes, the second branch pipes are provided with third branch pipes, the second branch pipes are communicated with the third branch pipes, and the third branch pipes are uniformly arranged along the axis direction of the second branch pipes;

the spray nozzles are arranged at the upper ends of the third branch pipes, two rows of spray nozzles are arranged on each third branch pipe and distributed in a staggered mode, a baffle is arranged at the upper end of each spray nozzle, a net cover is arranged on each baffle, and a cleaning system is arranged on each third branch pipe.

Furthermore, a first connecting pipe is arranged between the first branch pipe and the second branch pipe, the lower end of the first connecting pipe is communicated with the first branch pipe, and the upper end of the first connecting pipe is communicated with the second branch pipe.

Furthermore, a third connecting pipe is arranged between the second branch pipe and the third branch pipe, the lower end of the third connecting pipe is communicated with the second branch pipe, and the upper end of the third connecting pipe is communicated with the third branch pipe.

Furthermore, a baffle is arranged at the upper end of the nozzle, a sleeve is arranged in the baffle, and the sleeve is sleeved on the nozzle.

Further, the mesh enclosure lower extreme is equipped with the connection pad.

Furthermore, the cleaning system comprises a main pipeline and branch pipelines, the main pipeline is installed at the upper end of the third branch pipeline, the branch pipelines correspond to the nozzles one to one, the lower ends of the branch pipelines are communicated with the main pipeline, and the upper ends of the branch pipelines penetrate through the baffle.

Further, the upper end of the branch pipeline is provided with a rubber sleeve.

The utility model has the advantages that:

1. the utility model is provided with an ammonia spraying main pipe and a first branch pipe, wherein the first branch pipe is provided with a second branch pipe, the second branch pipe is provided with a third branch pipe, the third branch pipes are uniformly arranged along the axis direction of the second branch pipe, the upper end of the third branch pipe is provided with nozzles, each third branch pipe is provided with two rows of nozzles, and the two rows of nozzles are distributed in a staggered way; the ammonia spraying pipeline is perpendicular to the flue gas flow direction and is arranged, a plurality of ammonia spraying branch pipes are arranged along with the flue gas ascending direction, the nozzles are uniformly distributed, ammonia is sprayed out through the nozzles on the branch pipes, the ammonia is uniformly distributed in the flue, the ammonia and the flue gas are uniformly mixed, the mixed flue gas is fully reacted after a catalyst, the denitration efficiency is improved, and meanwhile, the ammonia is uniformly distributed and cannot escape, and the environment is protected.

2. The utility model is provided with the baffle on the upper end of the nozzle, the baffle is provided with the mesh enclosure, the third branch pipe is provided with the cleaning system, the baffle plays the role of blocking the flue gas, and the flow velocity of the flue gas is reduced, so that the reaction time of the ammonia gas and the flue gas is longer; the screen panel can be with nozzle department spun water column one-tenth water vaporific for aqueous ammonia and flue gas intensive mixing improve denitration efficiency, and is effectual.

3. The utility model discloses be equipped with cleaning system, cleaning system includes main line and lateral conduit, and the main line is installed in the third branch pipe upper end, lateral conduit and nozzle one-to-one, lateral conduit lower extreme and main line intercommunication, and the baffle is passed to the lateral conduit upper end, and gas washs the screen panel through main line and lateral conduit in proper order, does not need the manual work to take the air gun and washs in turn, and easy operation is convenient, and the practicality is good.

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 description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

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

FIG. 2 is a schematic top view of the second branch pipe and the third branch pipe of the present invention;

FIG. 3 is a schematic front view of the second branch pipe and the third branch pipe of the present invention;

fig. 4 is a sectional view of the nozzle of the present invention.

In the figure: spout ammonia female pipe 1, first branch pipe 2, second branch pipe 3, third branch pipe 4, nozzle 5, rubber sleeve 6, baffle 7, screen panel 8, first connecting pipe 9, third connecting pipe 10, sleeve 11, connection pad 12, main line 13, lateral line 14.

Detailed Description

In order to make the technical solutions in 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 accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

As shown in figures 1 to 4, an ammonia injection grid device for denitration comprises an ammonia injection main pipe 1 and first branch pipes 2, wherein the first branch pipes 2 are uniformly arranged along the axial direction of the ammonia injection main pipe 1, the ammonia injection main pipe 1 is communicated with the first branch pipes 2, the axial lines of the first branch pipes 2 are vertical to the axial line of the ammonia injection main pipe 1, the first branch pipe 2 is provided with a second branch pipe 3, the second branch pipe 3 is supported on the first branch pipe 2, the first branch pipe 2 is communicated with the second branch pipe 3, the axis of the second branch pipe 3 is vertical to the axis of the first branch pipe 2, the second branch pipe 3 is provided with a third branch pipe 4, the second branch pipe 3 is communicated with the third branch pipe 4, the third branch pipes 4 are uniformly arranged along the axis direction of the second branch pipe 3, in the embodiment, four third branch pipes 4 are arranged, the first branch pipe 2 is positioned between the middle two third branch pipes 4, two second branch pipes 3 are arranged, and the two second branch pipes 3 are distributed along the third branch pipes 4 in a centrosymmetric manner; the cleaning device is characterized in that nozzles 5 are arranged at the upper ends of the third branch pipes 4, two rows of nozzles 5 are arranged on each third branch pipe 4, the two rows of nozzles 5 are distributed in a staggered mode, baffles 7 are arranged at the upper ends of the nozzles 5, mesh enclosures 8 are arranged on the baffles 7, and cleaning systems are arranged on the third branch pipes 4. The ammonia spraying pipeline is arranged perpendicular to the flow direction of the flue gas, the plurality of ammonia spraying branch pipes are arranged along the rising direction of the flue gas, the nozzles 5 are uniformly distributed, ammonia is sprayed out from the nozzles 5 on the branch pipes, so that the ammonia is uniformly distributed in the flue, the ammonia and the flue gas are uniformly mixed, the mixed flue gas is fully reacted after passing through a catalyst, the denitration efficiency is improved, and meanwhile, the ammonia is uniformly distributed, cannot escape and protects the environment; the baffle 7 plays a role in blocking flue gas, and reduces the flow velocity of the flue gas, so that the reaction time of ammonia gas and the flue gas is longer; the screen panel 8 can be vaporific with 5 spun water columns of department's water of nozzle for aqueous ammonia and flue gas intensive mixing, the denitration is efficient, and is effectual.

As shown in fig. 3, a first connecting pipe 9 is arranged between the first branch pipe 2 and the second branch pipe 3, the lower end of the first connecting pipe 9 is communicated with the first branch pipe 2, and the upper end of the first connecting pipe 9 is communicated with the second branch pipe 3. And a third connecting pipe 10 is arranged between the second branch pipe 3 and the third branch pipe 4, the lower end of the third connecting pipe 10 is communicated with the second branch pipe 3, and the upper end of the third connecting pipe 10 is communicated with the third branch pipe 4. The ammonia water is sprayed out from the spray head through the ammonia spraying main pipe 1, the first branch pipe 2, the first connecting pipe 9, the second branch pipe 3, the third connecting pipe 10 and the third branch pipe 4 at one time.

As shown in fig. 4, the upper end of the nozzle 5 is provided with a baffle 7, a sleeve 11 is arranged in the baffle 7, the sleeve 11 is sleeved on the nozzle 5, the sleeve 11 and the nozzle 5 are fixed by screws, the baffle 7 is convenient to disassemble and assemble, and the baffle 7 and the mesh enclosure 8 are convenient to take down and clean.

As shown in fig. 4, a connecting disc 12 is arranged at the lower end of the mesh enclosure 8, and the connecting disc 12 is connected with the baffle 7 through a screw.

As shown in fig. 4, the cleaning system includes a main pipeline 13 and branch pipelines 14, the main pipeline 13 is connected with an air source, the figure is not shown, the main pipeline 13 is installed at the upper end of the third branch pipe 4, the branch pipelines 14 are in one-to-one correspondence with the nozzles 5, the lower ends of the branch pipelines 14 are communicated with the main pipeline 13, the baffle 7 is provided with through holes, and the upper ends of the branch pipelines 14 pass through the through holes on the baffle 7. Gas washs screen panel 8 through main line 13 and branch line 14 in proper order, does not need the manual work to hold the air gun and washs one by one, and easy operation is convenient, and the practicality is good.

As shown in fig. 4, branch pipeline 14 upper end is equipped with rubber sleeve 6, rubber sleeve 6 passes through the staple bolt to be fixed in branch pipeline 14 upper end, spout ammonia denitration in-process, rubber sleeve 6 can block in the aqueous ammonia enters into branch pipeline 14, when needs wash screen panel 8, blow gas on screen panel 8 through branch pipeline 14 and wash the screen panel, blow off rubber sleeve 6 under gaseous effect this moment, rubber sleeve 6 can be under the prerequisite that does not influence washing screen panel 8, can prevent that the aqueous ammonia from flowing into branch pipeline 14, better protection pipeline, waste is reduced, and cost is reduced.

In the description of the present invention, it should be noted that the terms "left", "right", "upper", "lower", 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 in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

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; they may be mechanically or electrically connected, directly or indirectly through intervening media, or 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.

Claims

1. The ammonia spraying grid device for denitration comprises a main ammonia spraying pipe (1) and first branch pipes (2), wherein the first branch pipes (2) are uniformly arranged along the axis direction of the main ammonia spraying pipe (1), and the main ammonia spraying pipe (1) is communicated with the first branch pipes (2), and is characterized in that the first branch pipes (2) are provided with second branch pipes (3), the first branch pipes (2) are communicated with the second branch pipes (3), the second branch pipes (3) are provided with third branch pipes (4), the second branch pipes (3) are communicated with the third branch pipes (4), and the third branch pipes (4) are uniformly arranged along the axis direction of the second branch pipes (3);

the cleaning device is characterized in that nozzles (5) are arranged at the upper ends of the third branch pipes (4), two rows of nozzles (5) are arranged on each third branch pipe (4), the two rows of nozzles (5) are distributed in a staggered mode, baffles (7) are arranged at the upper ends of the nozzles (5), mesh enclosures (8) are arranged on the baffles (7), and cleaning systems are arranged on the third branch pipes (4).

2. The ammonia injection grid device for denitration according to claim 1, wherein a first connecting pipe (9) is provided between the first branch pipe (2) and the second branch pipe (3), a lower end of the first connecting pipe (9) is communicated with the first branch pipe (2), and an upper end of the first connecting pipe (9) is communicated with the second branch pipe (3).

3. The ammonia injection grid device for denitration according to claim 1, wherein a third connecting pipe (10) is provided between the second branch pipe (3) and the third branch pipe (4), the lower end of the third connecting pipe (10) is communicated with the second branch pipe (3), and the upper end of the third connecting pipe (10) is communicated with the third branch pipe (4).

4. The ammonia injection grid device for denitration according to claim 1, wherein a baffle (7) is provided at the upper end of the nozzle (5), a sleeve (11) is provided in the baffle (7), and the sleeve (11) is sleeved on the nozzle (5).

5. The ammonia injection grid device for denitration according to claim 1, wherein a connecting disc (12) is provided at the lower end of the mesh enclosure (8).

6. The ammonia injection grid device for denitration according to claim 1, wherein the cleaning system comprises a main pipeline (13) and branch pipelines (14), the main pipeline (13) is installed at the upper end of the third branch pipe (4), the branch pipelines (14) correspond to the nozzles (5) one by one, the lower ends of the branch pipelines (14) are communicated with the main pipeline (13), and the upper ends of the branch pipelines (14) pass through the baffle (7).

7. The ammonia injection grid device for denitration according to claim 6, wherein a rubber sleeve (6) is provided at the upper end of said branch pipe (14).