Denitration spray gun structure with built-in flue

Abstract

The utility model discloses a denitration spray gun structure with a built-in flue. Belongs to the technical field of boiler flue gas denitration. According to the technical key points, the device comprises a flue, the outer wall of the flue is wrapped with a heat preservation layer, a plurality of denitration spray guns are distributed on the flue at intervals in the circumferential direction, the denitration spray guns are arranged in the horizontal direction, and the front ends of the denitration spray guns extend into the flue; the denitration spray guns located in the flue are surrounded by an air cooling interlayer structure, and the outer wall of the air cooling interlayer structure is coated with a refractory layer; the utility model aims to provide the denitration spray gun structure with the built-in flue, which is simple in structure and the outlet of the spray gun is far away from the inner wall; the device is used for denitration of spray in a boiler flue.

Description

TECHNICAL FIELD

[0001] The utility model relates to a denitration spray gun structure, more specifically, especially a built-in denitration spray gun structure of flue. BACKGROUND

[0002] In order to avoid that the denitration spray gun is damaged by high-speed and high-dust flue gas, the traditional boiler denitration spray gun is installed in a mode that the spray head is flush with the inner wall surface of the flue or hearth, and since the flue gas flow rate is high, the atomized liquid sprayed by the traditional denitration spray gun cannot penetrate the flue gas well, the atomized liquid of the denitration spray gun sticks to the inner wall surface of the flue or hearth, which affects the denitration efficiency and corrodes the inner wall surface of the flue or hearth. SUMMARY

[0003] The utility model discloses a built-in denitration spray gun structure of flue, which is simple in structure and has a spray gun outlet far away from the inner wall.

[0004] The technical scheme of the utility model is as follows: a built-in denitration spray gun structure of flue, comprising a flue, wherein the outer wall of the flue is wrapped with a heat preservation layer, a plurality of denitration spray guns are distributed at intervals in the circumferential direction of the flue, each denitration spray gun is arranged in the horizontal direction and has a front end extending into the flue, the denitration spray gun located in the flue is surrounded by a wind-cooled sandwich structure, and a refractory layer is coated on the outer wall of the wind-cooled sandwich structure.

[0005] In the built-in denitration spray gun structure of flue, the distance between the front end of the denitration spray gun and the inner wall of the flue is not less than one third of the inner diameter of the flue.

[0006] In the built-in denitration spray gun structure of flue, the wind-cooled sandwich structure comprises a flange seat arranged on the outer wall of the flue, a first cooling cylinder is arranged in the flange seat, a first flange ring connected with the flange seat is arranged on the proximal end of the first cooling cylinder located on the outer side of the flue, and an air inlet pipe connected with an external cooling air source is arranged on the side wall of the first cooling cylinder.

[0007] In the built-in denitration spray gun structure of flue, a second flange ring is arranged on the outer end of the first cooling cylinder, a second cooling cylinder is arranged in the first cooling cylinder, a bottom plate matched with the second flange ring is arranged on the outer end of the second cooling cylinder, mounting holes for mounting the denitration spray gun are arranged on the bottom plate, and a plurality of air passing holes are uniformly distributed in the circumferential direction on the side wall of the second cooling cylinder close to the bottom plate.

[0008] In the built-in denitration spray gun structure of flue, the included angle between the front end of the denitration spray gun and the flue is 0-90°, and an atomizing spray head is arranged on the end of the denitration spray gun.

[0009] The denitration spray gun is arranged perpendicularly to the flue, and a plurality of atomizing nozzles parallel to the flue are uniformly distributed on the side wall of the denitration spray gun on the side of the flue advancing direction, a plurality of through holes matched with the atomizing nozzles are arranged on the air-cooling interlayer structure, and a semicircular wind baffle is arranged in the through hole on the side of the atomizing nozzle close to the center of the flue.

[0010] The flue-inbuilt denitration spray gun structure has the advantages that the denitration spray gun is protected by the air-cooling interlayer structure and the refractory layer, the front end spray opening of the denitration spray gun is inserted into the flue, the smoke is far away from the inner wall of the flue or the hearth when entering the flue, the atomized liquid is not easy to stick to the inner wall, the denitration efficiency is improved, and the flue or the hearth inner wall is prevented from being corroded by the smoke. BRIEF DESCRIPTION OF DRAWINGS

[0011] The utility model makes further detailed description in combination with the embodiment in the drawings, but does not constitute any limit to the utility model.

[0012] Figure 1 It is the structure schematic diagram of the utility model embodiment 1;

[0013] Figure 2 It is the structure schematic diagram of the utility model denitration spray gun and flue parallel;

[0014] Figure 3 It is the local structure schematic diagram of the utility model A;

[0015] Figure 4 It is the structure schematic diagram of the utility model embodiment 2;

[0016] Figure 5 It is the local structure schematic diagram of the utility model B.

[0017] In the drawing: 1, flue;2, heat preservation layer;3, denitration spray gun;4, refractory layer;5, flange seat;6, first cooling cylinder;7, first flange ring;8, air inlet pipe;9, second flange ring;10, second cooling cylinder;11, bottom plate;12, mounting hole;13, air passing hole;14, atomizing nozzle;15, through hole;16, semicircular wind baffle. DETAILED DESCRIPTION

[0018] Embodiment 1

[0019] Refer to Figures 1-3The utility model discloses a flue built-in denitration spray gun structure, including flue 1, the outer wall of flue 1 is wrapped with heat preservation layer 2, the flue 1 is along the circumferential interval distribution and has a plurality of denitration spray guns 3, and each denitration spray gun 3 is set along the horizontal direction and the front end is inserted into the flue 1, the denitration spray gun 3 in the flue 1 is surrounded and is provided with the air cooling interlayer structure, and the outer wall of air cooling interlayer structure is covered with refractory layer 4. Through the air cooling interlayer structure and the refractory layer protection denitration spray gun makes it the front end spray port is inserted into the inside of flue, makes the smoke into the flue far away from the flue or hearth inner wall surface, atomized liquid is not easy to stick to the inner wall surface, can improve the denitration efficiency and avoid the smoke corrosion flue or hearth inner wall surface.

[0020] The outer end of the denitration spray gun is connected to an external compressed air source and a urea solution source through a pipeline, and the specific connection mode is well known to those skilled in the art, which will not be repeated here.

[0021] The refractory layer is composed of refractory mortar wrapped on the outer wall of the air cooling interlayer structure, and a plurality of rivets or other fixing structures are distributed on the outer wall of the air cooling interlayer structure for fixing the refractory mortar. These are existing technologies in the field, and will not be repeated here.

[0022] In this embodiment, the distance between the front end of the denitration spray gun 3 and the inner wall of the flue 1 is not less than one third of the inner diameter of the flue. When the front end of the denitration spray gun is set at this position, the front end spray port is as far away from the flue inner wall as possible, which can ensure that the smoke is not stuck to the inner wall surface when sprayed. The specific distance between the two can be adjusted according to the actual production of the flue gas wind speed and the speed of the spray.

[0023] In this embodiment, the air cooling interlayer structure includes a flange seat 5 arranged on the outer wall of the flue 1, and a first cooling cylinder 6 is arranged in the flange seat 5. A first flange ring 7 connected with the flange seat 5 is arranged on the proximal end of the first cooling cylinder 6 located on the outer side of the flue. An air inlet pipe 8 connected with an external cooling air source is arranged on the side wall of the first cooling cylinder 6. The inner diameter of the first cooling cylinder is larger than the outer diameter of the denitration spray gun, and a channel for providing cooling gas is formed between the two, which isolates the high temperature of the flue gas from the denitration spray gun, avoiding damage to the denitration spray gun caused by high temperature gas.

[0024] In the embodiment, the first cooling cylinder 6 is provided with a second flange ring 9 at the outer end, and a second cooling cylinder 10 is sleeved in the first cooling cylinder 6; the second cooling cylinder 10 is provided with a bottom plate 11 matched with the second flange ring 9 at the outer end, and the bottom plate 11 is provided with a mounting hole 12 for mounting the denitration spray gun 3; and the side wall of the second cooling cylinder 10 close to the bottom plate 11 is provided with a plurality of air passing holes 13 distributed in the circumferential direction. The inner diameter of the second cooling cylinder is greater than the outer diameter of the denitration spray gun, and the outer diameter of the second cooling cylinder is smaller than the inner diameter of the first cooling cylinder. By matching the first cooling cylinder and the second cooling cylinder to form a multi-layer cooling channel, the high temperature is further isolated from the denitration spray gun, so that the denitration spray gun is prevented from being damaged by the high temperature gas.

[0025] In the embodiment, the included angle between the front end of the denitration spray gun 3 and the flue 1 is 0-90°, and the denitration spray gun 3 is provided with an atomizing nozzle 14 at the end. The front end of the denitration spray gun can be set according to the wind speed of the flue gas in the flue and the speed of the spray.

[0026] In operation, the first cooling cylinder is blown with cold air by an external cooling air source, the denitration spray gun is filled with urea solution and compressed air by an external atomizing assembly, and the flue is sprayed, so that the flue gas is denitrated.

[0027] Embodiment 2

[0028] Referring to Figures 4-5 The utility model discloses a built-in denitration spray gun structure of flue, and the structure is basically same with embodiment 1, and the difference lies in that, in the embodiment, the denitration spray gun 3 is perpendicular to the flue 1, and a plurality of atomizing nozzles 14 parallel to the flue 1 are uniformly distributed on the side wall of the denitration spray gun 3 on the side of the flue 1 in the forward direction, a plurality of through holes 15 matched with the atomizing nozzles 14 are arranged on the air cooling interlayer structure, and a semicircular baffle 16 is arranged in the through hole 15 close to the center of the flue 1 on the side of the atomizing nozzle 14. After adopting the structure, the spray is carried out through the atomizing nozzles in two directions, the contact between the smoke and the flue gas in the flue is improved, and the denitration efficiency is further improved.

[0029] The semicircular baffle blocks the cooling air, so that the cooling air can be blown out from the through hole to cool and insulate the atomizing nozzle, and the cooling air is prevented from being quickly blown from below the through hole to form siphon and be sucked into the external high temperature flue gas.

[0030] The use method is same with embodiment 1.

[0031] The above-mentioned embodiments are preferred embodiments of the present application, which are only used for conveniently illustrating the present application, and do not limit the present application in any form, and any person with ordinary knowledge in the art can make equivalent embodiments with partial changes or modifications within the technical features disclosed by the present application without departing from the technical features of the present application, and the equivalent embodiments still belong to the scope of the technical features of the present application.

Claims

1. A flue-embedded denitration spray gun structure, comprising a flue (1), an outer wall of the flue (1) being wrapped with a heat preservation layer (2), characterized in that, The flue (1) is circumferentially spaced with several denitration spray guns (3), each of which is arranged along the horizontal direction and has a front end extending into the flue (1); The denitration spray gun (3) located in the flue (1) is surrounded by a wind-cooled sandwich structure, and the outer wall of the wind-cooled sandwich structure is coated with a refractory layer (4).

2. The flue-embedded denitration spray gun structure according to claim 1, characterized in that, The distance between the front end of the denitration spray gun (3) and the inner wall of the flue (1) is not less than one third of the inner diameter of the flue.

3. The flue-embedded denitration spray gun structure according to claim 1, characterized in that, The wind-cooled sandwich structure includes a flange seat (5) arranged on the outer wall of the flue (1), and a first cooling cylinder (6) is arranged in the flange seat (5); a first flange ring (7) connected with the flange seat (5) is arranged at the proximal end of the first cooling cylinder (6) located on the outer side of the flue; and an air inlet pipe (8) connected with an external cooling air source is arranged on the side wall of the first cooling cylinder (6).

4. The flue-embedded denitration spray gun structure according to claim 3, characterized in that, The outer end of the first cooling cylinder (6) is provided with a second flange ring (9), and a second cooling cylinder (10) is arranged in the first cooling cylinder (6); a bottom plate (11) matched with the second flange ring (9) is arranged at the outer end of the second cooling cylinder (10), and a mounting hole (12) for mounting the denitration spray gun (3) is arranged on the bottom plate (11); and a plurality of air passing holes (13) are circumferentially distributed on the side wall of the second cooling cylinder (10) close to the bottom plate (11).

5. The flue-embedded denitration spray gun structure according to claim 1, characterized in that, The angle between the front end of the denitration spray gun (3) and the flue (1) is 0-90°, and an atomizing nozzle (14) is arranged at the end of the denitration spray gun (3).

6. The flue-embedded denitration spray gun structure according to claim 1, characterized in that, The denitration spray gun (3) is arranged perpendicular to the flue (1), a plurality of atomizing nozzles (14) parallel to the flue (1) are circumferentially distributed on the side wall of the denitration spray gun (3) located on one side of the flue (1) in the forward direction, a plurality of through holes (15) matched with the atomizing nozzles (14) are arranged on the wind-cooled sandwich structure, and a semicircular baffle (16) is arranged in the through hole (15) close to the center of the flue (1) on the side of the atomizing nozzle (14).

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