Turbulent flow synergistic device for SCR (Selective Catalytic Reduction) denitration process

Abstract

The utility model belongs to the technical field of SCR (Selective Catalytic Reduction) denitration, and discloses a turbulence synergistic device for an SCR denitration process, which comprises an SCR reactor and a feeding piece, the feeding piece comprises a feeding pipe, an input part is arranged on the feeding pipe, a static mixing part and a second connecting shaft are arranged in the feeding pipe, and the static mixing part is connected with the second connecting shaft. The static mixing part and the second connecting shaft are located between the input part and the SCR reactor, the static mixing part is located between the second connecting shaft and the SCR reactor, a mixing channel allowing flue gas and ammonia gas to pass through is formed in the static mixing part, the second connecting shaft is rotationally connected to the interior of the feeding pipe, a rotating plate is fixedly connected to the circumferential surface of the second connecting shaft, and the rotating plate is fixedly connected to the rotating plate. According to the utility model, by arranging the rotatable second connecting shaft and the rotating plate, before ammonia gas and flue gas pass through the static mixing part, the rotating plate is driven by the second connecting shaft to rotate, so that the flue gas and the ammonia gas are stirred, the ammonia gas and the flue gas can be dynamically mixed, and the mixing efficiency of the flue gas and the ammonia gas is accelerated.

Description

Technical Field

[0001] The utility model belongs to the technical field of SCR denitration, and in particular relates to a turbulence efficiency enhancement device for an SCR denitration process. Background Art

[0002] Industrial flue gas is emitted during industrial production, and nitrogen oxides (NOx) in industrial flue gas will pollute the environment. In order to reduce the pollution to ventilation, it is necessary to treat the nitrogen oxides (NOx) in industrial flue gas. Among the many treatment technologies, SCR denitrification technology has become one of the mainstream technologies for flue gas denitrification with its efficient NOx removal capacity and wide operating temperature window. However, there are still some problems and challenges in the actual application of SCR denitrification technology.

[0003] First, in the traditional SCR denitration process, the mixing efficiency of ammonia and flue gas is not high. This is mainly because the flow state of flue gas in the reactor is relatively stable, and ammonia is difficult to fully mix with flue gas, resulting in part of ammonia not reacting with NOx and being directly discharged, which reduces the denitration efficiency. In order to improve the denitration efficiency, it is necessary to improve the mixing efficiency of ammonia and flue gas through a performance enhancement device. For example, in the Chinese patent with the announcement number "CN 217795492 U", a turbulent performance enhancement device for SCR denitration process is disclosed, which includes a reactor, a pipe is connected to one side of the reactor, a guide plate is provided inside the pipe, a turbulent mixer is provided inside the pipe, and an ammonia spraying grid is provided inside the pipe. When the device is used, ammonia and flue gas are mixed through the turbulent mixer, but the structure can only mix ammonia and flue gas statically, so the mixing efficiency is limited. Utility Model Content

[0004] The purpose of the utility model is to provide a turbulence enhancement device for SCR denitration process to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a turbulence enhancement device for an SCR denitrification process, comprising an SCR reactor and a feed piece, the discharge end of the feed piece is connected to the feed end of the SCR reactor, and the feed piece comprises a feed pipe for conveying flue gas along a preset path, an input part for inputting ammonia is installed on the feed pipe, the discharge end of the input part is communicated with the inside of the feed pipe, and a static mixing part and a second connecting shaft are installed inside the feed pipe, the static mixing part and the second connecting shaft are located between the input part and the SCR reactor, and the static mixing part is located between the second connecting shaft and the SCR reactor, a mixing channel for flue gas and ammonia to pass through is formed on the static mixing part, the second connecting shaft is rotatably connected to the inside of the feed pipe, and a rotating plate is fixedly connected to the circumferential surface of the second connecting shaft.

[0006] Preferably, a conical cover is fixedly connected to the inside of the feed pipe, the static mixing part is located between the conical cover and the second connecting shaft, the conical cover is open to one side of the static mixing part to form a mixing chamber, the inside of the mixing chamber is rotatably connected to the first connecting shaft, a mixing plate is fixedly connected to the circumferential surface of the first connecting shaft, and an air outlet is formed on the side of the first connecting shaft away from the mixing plate.

[0007] Preferably, the diameter of the conical cover at one side facing the static mixing portion is smaller than the diameter at the other side.

[0008] Preferably, the input part comprises an ammonia injection grid, the gas outlet end of the ammonia injection grid extends to the inside of the feed pipe, and the gas inlet end of the ammonia injection grid is fixedly connected to an ammonia delivery pipe.

[0009] Preferably, a second motor is fixedly connected to the feed pipe, and an output end of the second motor is connected to a second connecting shaft;

[0010] A first motor is fixedly connected inside the feed pipe, and an output end of the first motor is connected to a first connecting shaft.

[0011] Preferably, the static mixing part includes a mounting frame, which is fixedly connected to the inside of the feed pipe and has a through-type mounting cavity. A plurality of spoiler frames are installed inside the mounting cavity, and the mixing channel is formed between two adjacent spoiler frames.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] (1) The utility model provides a rotatable second connecting shaft and a rotating plate. Before the ammonia gas and the flue gas pass through the static mixing part, the rotating plate is driven to rotate by the second connecting shaft, thereby stirring the flue gas and the ammonia gas, so that the ammonia gas and the flue gas can be dynamically mixed, thereby accelerating the mixing efficiency of the flue gas and the ammonia gas.

[0014] (2) On the basis of the above-mentioned beneficial effects, the utility model blocks the smoke and ammonia by means of a conical cover, drives the first connecting shaft through the first motor to drive the mixing plate to rotate, and then stirs the smoke and ammonia, so that the smoke and ammonia are further mixed in the mixing chamber and the mixed smoke and ammonia are discharged through the air outlet, thereby further improving the mixing efficiency of the smoke and ammonia. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is one of the three-dimensional diagrams of the utility model;

[0016] Figure 2 This is the second stereogram of the utility model;

[0017] Figure 3 It is a three-dimensional diagram of the feed piece of the utility model;

[0018] Figure 4 This is one of the cross-sectional views of the feed piece of the utility model;

[0019] Figure 5 This is the second cross-sectional view of the feed piece of the utility model;

[0020] Figure 6 It is a three-dimensional diagram of the conical cover of the utility model;

[0021] Figure 7 A three-dimensional diagram of the spoiler of the utility model;

[0022] In the figure: 1. SCR reactor; 2. feed piece; 21. feed pipe; 22. ammonia delivery pipe; 23. spoiler; 24. mounting cavity; 25. air outlet; 26. first motor; 27. conical cover; 28. mounting frame; 29. ​​second motor; 210. ammonia injection grid; 211. rotating plate; 212. second connecting shaft; 213. mixing plate; 214. first connecting shaft; 215. mixing cavity. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-Figure 7 As shown, the utility model provides the following technical solutions:

[0025] A turbulence efficiency enhancement device for an SCR denitration process comprises an SCR reactor 1 and a feed piece 2, wherein the discharge end of the feed piece 2 is connected to the feed end of the SCR reactor 1, and the feed piece 2 comprises a feed pipe 21 for conveying flue gas along a preset path, an input part for inputting ammonia is installed on the feed pipe 21, the discharge end of the input part is communicated with the inside of the feed pipe 21, and a static mixing part and a second connecting shaft 212 are installed inside the feed pipe 21, the static mixing part and the second connecting shaft 212 are located between the input part and the SCR reactor 1, and the static mixing part is located between the second connecting shaft 212 and the SCR reactor 1, a mixing channel for flue gas and ammonia to pass through is formed on the static mixing part, the second connecting shaft 212 is rotatably connected to the inside of the feed pipe 21, and a rotating plate 211 is fixedly connected to the circumferential surface of the second connecting shaft 212.

[0026] Through the above technical solution, when personnel need to carry out denitrification production, the pipeline for conveying ammonia is connected to the feed end of the input part, and then the pipeline for conveying flue gas is connected to the feed pipe 21, and the flue gas is conveyed to the inside of the feed pipe 21, and the ammonia is conveyed to the inside of the feed pipe 21 through the input part, so that the ammonia and the flue gas are conveyed together along the feed pipe 21. When the ammonia and the flue gas are conveyed, the rotating plate 211 is driven to rotate by the second connecting shaft 212, so that the rotating plate 211 stirs the ammonia and the flue gas, and then the ammonia and the flue gas are mixed. After the ammonia and the flue gas are mixed under the action of the rotating plate 211, the ammonia and the flue gas continue to be conveyed, so that the ammonia and the flue gas are further mixed through the static mixing part, and the ammonia and the flue gas are conveyed to the inside of the SCR reactor 1 after mixing, so as to carry out denitrification production.

[0027] In addition, in the present invention, in order to further improve the mixing efficiency of ammonia and flue gas, as shown in the figure, a conical cover 27 is fixedly connected inside the feed pipe 21, and the static mixing part is between the conical cover 27 and the second connecting shaft 212. The conical cover 27 is open toward one side of the static mixing part to form a mixing chamber 215, and the inside of the mixing chamber 215 is rotatably connected to the first connecting shaft 214, and the circumferential surface of the first connecting shaft 214 is fixedly connected to the mixing plate 213, and the side of the first connecting shaft 214 away from the mixing plate 213 forms an outlet hole 25;

[0028] The diameter of the conical cover 27 on one side facing the static mixing section is smaller than the diameter on the other side.

[0029] In this embodiment, after the ammonia and the flue gas are mixed through the static mixing part, in order to further improve the mixing efficiency of the ammonia and the flue gas, the ammonia and the flue gas are shielded by the conical cover 27, and the air outlet 25 cooperates to prevent the ammonia and the flue gas from passing through the feed pipe 21 quickly. After the ammonia and the flue gas enter the mixing chamber 215 on one side of the conical cover 27, the mixing plate 213 is driven to rotate by the first connecting shaft 214, and the ammonia and the flue gas are stirred by the mixing plate 213 to further mix the ammonia and the flue gas, and finally the mixed ammonia and the flue gas are discharged through the air outlet 25, thereby further improving the mixing efficiency of the ammonia and the flue gas.

[0030] Specifically, in one embodiment, regarding the above input part:

[0031] like Figure 1-Figure 5 As shown, the input part includes an ammonia injection grid 210 , the gas outlet end of the ammonia injection grid 210 extends to the inside of the feed pipe 21 , and the gas inlet end of the ammonia injection grid 210 is fixedly connected to the ammonia delivery pipe 22 .

[0032] In this embodiment, the pipeline for transporting ammonia is connected through the ammonia pipe 22, and then the ammonia pipe 22 transports ammonia to the ammonia injection grid 210, and the ammonia is transported to the inside of the feed pipe 21 through the ammonia injection grid 210, so as to be transported synchronously with the flue gas inside the feed pipe 21.

[0033] Regarding how the first connecting shaft 214 and the second connecting shaft 212 rotate, in the present invention, as shown in FIG. Figure 1-Figure 6 As shown, a second motor 29 is fixedly connected to the feed pipe 21, and an output end of the second motor 29 is connected to a second connecting shaft 212;

[0034] A first motor 26 is fixedly connected inside the feed pipe 21 , and an output end of the first motor 26 is connected to the first connecting shaft 214 .

[0035] In this embodiment, when a person needs to drive the second connecting shaft 212 to rotate, the second motor 29 is operated, thereby allowing the second motor 29 to drive the second connecting shaft 212 to rotate. When the first connecting shaft 214 needs to be driven to rotate, the first motor 26 is operated, thereby allowing the first motor 26 to drive the first connecting shaft 214 to rotate.

[0036] In addition, in the present invention, regarding the above-mentioned static mixing part:

[0037] As 4- Figure 5 and Figure 7 As shown, the static mixing part includes a mounting frame 28, which is fixedly connected to the inside of the feed pipe 21, and a through-type mounting cavity 24 is opened on the mounting frame 28. A plurality of spoiler frames 23 are installed inside the mounting cavity 24, and a mixing channel is formed between two adjacent spoiler frames 23.

[0038] In this embodiment, when the flue gas and ammonia pass through the static mixing part, the mounting frame 28 is supported by the feed pipe 21, and the spoiler frame 23 is supported by the mounting cavity 24 on the mounting frame 28. When the flue gas and ammonia pass through the mixing channel formed between two adjacent spoiler frames 23, the flue gas and ammonia are further mixed.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A turbulence enhancement device for SCR denitration process, characterized by: The invention comprises an SCR reactor (1) and a feed piece (2), wherein the discharge end of the feed piece (2) is connected to the feed end of the SCR reactor (1), and the feed piece (2) comprises a feed pipe (21) for conveying flue gas along a preset path, an input part for inputting ammonia is installed on the feed pipe (21), the discharge end of the input part is communicated with the inside of the feed pipe (21), and a static mixing part and a second connecting shaft (212) are installed inside the feed pipe (21), the static mixing part and the second connecting shaft (212) are located between the input part and the SCR reactor (1), and the static mixing part is located between the second connecting shaft (212) and the SCR reactor (1), a mixing channel for flue gas and ammonia to pass through is formed on the static mixing part, the second connecting shaft (212) is rotatably connected to the inside of the feed pipe (21), and a rotating plate (211) is fixedly connected to the circumferential surface of the second connecting shaft (212).

2. The turbulence enhancement device for SCR denitration process according to claim 1, characterized in that: A conical cover (27) is also fixedly connected to the inside of the feed pipe (21), and the static mixing part is located between the conical cover (27) and the second connecting shaft (212). The conical cover (27) is open toward one side of the static mixing part to form a mixing chamber (215), and the inside of the mixing chamber (215) is rotatably connected to a first connecting shaft (214), and a mixing plate (213) is fixedly connected to the circumferential surface of the first connecting shaft (214), and an air outlet (25) is formed on the side of the first connecting shaft (214) away from the mixing plate (213).

3. The turbulence enhancement device for SCR denitration process according to claim 2 is characterized in that: The diameter of the conical cover (27) on one side facing the static mixing portion is smaller than the diameter on the other side.

4. The turbulence enhancement device for SCR denitration process according to claim 1, characterized in that: The input part comprises an ammonia injection grid (210), the gas outlet end of the ammonia injection grid (210) extends to the interior of the feed pipe (21), and the gas inlet end of the ammonia injection grid (210) is fixedly connected to an ammonia delivery pipe (22).

5. The turbulence enhancement device for SCR denitration process according to claim 1, characterized in that: The feed pipe (21) is fixedly connected to a second motor (29), and an output end of the second motor (29) is connected to a second connecting shaft (212); A first motor (26) is fixedly connected inside the feed pipe (21), and an output end of the first motor (26) is connected to a first connecting shaft (214).

6. The turbulence enhancement device for SCR denitration process according to claim 1, characterized in that: The static mixing part comprises a mounting frame (28), the mounting frame (28) is fixedly connected to the inside of the feed pipe (21), and a through-type mounting cavity (24) is opened on the mounting frame (28), a plurality of spoiler frames (23) are installed inside the mounting cavity (24), and the mixing channel is formed between two adjacent spoiler frames (23).

Images