Bypass high-temperature flue gas heating device with electric diversion trench

Abstract

The utility model discloses a bypass high-temperature flue gas heating device with an electric diversion trench, relates to the technical field of boiler flue gas temperature regulation, and aims to solve the problem of designing a flue gas diversion device capable of realizing uniform diversion. The bypass high-temperature flue gas heating device comprises a low-temperature flue which is communicated with a denitration system; a plurality of air ports are formed in the side surface of the low-temperature flue, the air ports are distributed at equal intervals in the transverse direction, the side surface of the low-temperature flue is further communicated with a high-temperature flue, and the high-temperature flue is arranged corresponding to the air ports so that the high-temperature flue can be communicated with the low-temperature flue through the air ports; a rotating shaft is rotationally connected into the low-temperature flue, flow guide grooves are fixedly connected to the positions, corresponding to the air openings, of the rotating shaft, and the flow guide grooves are arranged to be triangular.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler flue gas temperature regulation, in particular to a bypass high-temperature flue gas heating device with an electric guide groove. Background Art

[0002] The boiler flue gas denitrification system requires an appropriate flue gas temperature to complete the denitrification reaction, and the reaction temperature should be controlled between 300-400°C. When the boiler is operating at low load and the flue gas temperature is less than 300°C, it is necessary to introduce a channel of high-temperature flue gas (400-600°C) into the denitrification inlet flue to evenly mix with the low-temperature flue gas and increase the temperature, thereby controlling the flue gas temperature of the denitrification reactor within the appropriate range. When the boiler is operating at high load, the flue gas temperature meets the denitrification reaction temperature requirement, and the high-temperature flue gas is stopped from entering the denitrification inlet flue.

[0003] Based on the above design requirements, it is necessary to design a device that can evenly guide high-temperature flue gas into low-temperature flue gas, so that high-temperature flue gas and low-temperature flue gas are evenly mixed, to prevent high-temperature flue gas from flowing into the denitrification reactor and causing high-temperature burning of the denitrification catalyst, and to prevent the low-temperature flue gas from being partially heated and reducing the denitrification reaction efficiency. In addition, when heating is not required, the diversion device should stay in the low-temperature flue in the downstream direction and should not block the low-temperature flue to cause flue gas resistance. When the flue gas contains high ash, it also avoids blocking the flue gas and causing wear on the device itself. Utility Model Content

[0004] In order to solve the above problem, that is, to design a flue gas diversion device that can achieve uniform diversion, the utility model proposes a bypass high-temperature flue gas heating device with an electric diversion groove, which includes a low-temperature flue, which is connected to the denitrification system, and a plurality of air outlets are opened on the side surface of the low-temperature flue, and the plurality of air outlets are arranged equidistantly along the horizontal direction. The side surface of the low-temperature flue is also connected to a high-temperature flue, and the high-temperature flue is arranged corresponding to the air outlet so that the high-temperature flue is connected to the low-temperature flue through the air outlet; a rotating shaft is rotatably connected in the low-temperature flue, and a guide groove is fixedly connected to the rotating shaft corresponding to each air outlet, and the guide groove is arranged in a triangle.

[0005] The present invention is further configured as follows: one end of the rotating shaft is connected to a driving device, the driving device is used to drive the rotating shaft to rotate, and the driving device is arranged outside the low-temperature flue.

[0006] The present invention is further configured such that the width of the guide groove is the same as the width of the air outlet.

[0007] The beneficial effects of the present invention are as follows: by providing a plurality of guide grooves, the high-temperature flue gas can be evenly introduced into the low-temperature flue and gradually mixed with the low-temperature flue gas above the guide grooves. This not only prevents the high-temperature flue gas from being concentrated and biased into the denitrification system, but also makes the high-temperature flue gas and the low-temperature flue gas mix more evenly, avoiding the problem of uneven mixing of the high-temperature flue gas and further avoiding the problem of catalyst burning due to high temperature and the low flue gas temperature reducing the denitrification reaction efficiency. At the same time, through the cooperation of the drive device and the rotating shaft, the guide groove can also be rotated in the downstream direction of the flue gas to avoid causing large smoke obstruction. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 Shown is a structural schematic diagram of the present utility model.

[0009] Figure 2 Shown is a schematic diagram of the internal structure of the utility model.

[0010] Figure 3 The diagram shows the state of the draft trough when the boiler is running at high load.

[0011] Figure 4 It shows a schematic diagram of the internal structure after the shaft is removed.

[0012] Figure numerals: 1, low-temperature flue; 11, air outlet; 2, high-temperature flue; 3, rotating shaft; 4, guide groove; 5, driving device. DETAILED DESCRIPTION

[0013] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0014] refer to Figure 1 The utility model proposes a bypass high-temperature flue gas heating device with an electric guide trough, which includes a low-temperature flue 1. The top of the low-temperature flue 1 is used to connect with the denitrification system, and the low-temperature flue gas enters the low-temperature flue 1 from the bottom of the low-temperature flue 1.

[0015] refer to Figure 4 A plurality of air vents 11 are provided on the side surface of the low-temperature flue 1. The air vents 11 are arranged in a rectangular shape and are arranged equidistantly in the horizontal direction. A high-temperature flue 2 is also fixedly connected to the side surface of the low-temperature flue 1. The high-temperature flue 2 is arranged corresponding to the air vents 11, so that the high-temperature flue 2 is connected with the low-temperature flue 1 through the air vents 11. The high-temperature flue gas in the high-temperature flue 2 can flow into the low-temperature flue 1 along the multiple air vents 11 and mix with the low-temperature flue gas therein to form a mixed flue gas that meets the denitrification temperature requirements.

[0016] The side wall of the low-temperature flue 1 is also rotatably connected to a rotating shaft 3, which is arranged horizontally. A guide groove 4 is welded to the rotating shaft 3 corresponding to each air outlet 11. The guide groove 4 is arranged in a triangular shape. The width of the guide groove 4 is set to the same as the width of the air outlet 11, and the height of the end of the guide groove 4 close to the air outlet 11 is also set to the same as the height of the air outlet 11. This can enable the guide groove 4 and the air outlet 11 to better cooperate in guiding. At the same time, it can also prevent the rotating shaft 3 from interfering with the frame of the air outlet 11 when driving the guide groove 4 to rotate.

[0017] One end of the rotating shaft 3 is connected to a driving device 5 through a coupling. The driving device 5 is a driving motor. The driving device 5 can drive the rotating shaft 3 to rotate, and then drive the guide groove 4 to rotate.

[0018] refer to Figure 2 When the boiler is running at low load, the driving device 5 drives the guide groove 4 to rotate to cooperate with the air port 11, opening the transportation of high-temperature flue gas, so that the high-temperature flue gas in the high-temperature flue 2 can flow into the guide groove 4 through the air port 11, and then enter the low-temperature flue 1 from the guide groove 4 to mix with the low-temperature flue gas to form mixed flue gas.

[0019] refer to Figure 3 When the boiler is running at high load, the driving device 5 drives the guide groove 4 to rotate 90 degrees. At this time, the guide groove 4 will be in a downstream state, closing the transportation of high-temperature flue gas, and the low-temperature flue gas will only flow in the low-temperature flue 1.

[0020] In summary, the utility model can evenly introduce high-temperature flue gas into the low-temperature flue 1 by setting a plurality of guide grooves 4, and gradually mix with the low-temperature flue gas above the guide grooves 4. This not only prevents the high-temperature flue gas from being concentrated and biased into the denitrification system, but also makes the high-temperature flue gas and the low-temperature flue gas mix more evenly, avoiding the problem of uneven mixing of the high-temperature flue gas and the low-temperature flue gas, and further avoids the problem of high-temperature burning of the catalyst and the low flue gas temperature reducing the denitrification reaction efficiency. At the same time, through the cooperation of the driving device 5 and the rotating shaft 3, the guide groove 4 can also be rotated to the downstream direction of the flue gas to avoid causing large smoke resistance.

[0021] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present invention. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

[0022] In the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and are not intended to indicate or imply that the device or component described must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] Furthermore, it should be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0024] The term "comprise" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed or inherent to such process, article, or apparatus / device.

[0025] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A bypass high-temperature flue gas heating device with an electric guide trough, comprising a low-temperature flue (1), wherein the low-temperature flue (1) is connected to a denitrification system, and is characterized in that: A plurality of air vents (11) are provided on the side surface of the low-temperature flue (1), and the plurality of air vents (11) are arranged equidistantly in the transverse direction. The side surface of the low-temperature flue (1) is also connected to a high-temperature flue (2), and the high-temperature flue (2) is arranged corresponding to the air vents (11) so that the high-temperature flue (2) is connected to the low-temperature flue (1) through the air vents (11); a rotating shaft (3) is rotatably connected inside the low-temperature flue (1), and a guide groove (4) is fixedly connected to the rotating shaft (3) corresponding to each of the air vents (11), and the guide groove (4) is arranged in a triangular shape.

2. The bypass high-temperature flue gas heating device with electric guide groove according to claim 1 is characterized in that: One end of the rotating shaft (3) is connected to a driving device (5), and the driving device (5) is used to drive the rotating shaft (3) to rotate. The driving device (5) is arranged outside the low-temperature flue (1).

3. The bypass high-temperature flue gas heating device with electric guide groove according to claim 1 is characterized in that: The width of the guide groove (4) is set to be the same as the width of the air outlet (11).

Images