Inlet flue gas rectifying device for high-temperature and high-dust denitration reactor of cement kiln

Abstract

The utility model relates to the field of cement environmental protection, in particular to an inlet flue gas rectifying device for a high-temperature and high-dust denitration reactor of a cement kiln. The technical problems that in the using process of the flue gas rectifying device, due to the fact that a conventional grid type flow guide plate only has the flow guide effect and cannot have the flow disturbing effect, a reducing agent and nitric oxide in flue gas are not fully mixed, concentrated dust cannot be dispersed, a catalyst is prone to being blocked, and the denitration efficiency is affected are solved. According to the technical scheme, the flue gas rectifying device at the inlet of the high-temperature and high-dust denitration reactor of the cement kiln comprises a grating guide plate, the device further comprises a grid supporting beam and a reactor inlet flue wall plate. According to the flue gas rectifying device, turbulent flow is formed after flue gas passes through the inverted V-shaped rectifying grid, so that nitric oxide, a reducing agent and dust in the flue gas uniformly pass through the reactor, the denitration efficiency is improved, and the flue gas rectifying device is relatively simple in structure, so that the flue gas rectifying device is convenient to mount, and the manufacturing and mounting cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of cement environmental protection, in particular to a flue gas rectifying device at the inlet of a high-temperature and high-dust denitration reactor of a cement kiln. Background Art

[0002] In the production of the cement industry, the flue gas generated contains a large amount of pollutants such as nitrogen oxides. With the gradual improvement of environmental protection requirements in the cement industry, the requirements for environmental protection equipment are also getting higher and higher. With the development of environmental protection technology, the high-temperature and high-dust denitration process of cement kilns is widely used in the treatment of cement kiln flue gas. However, in the process of using the existing flue gas rectifying device, since the more uniform the mixing of nitrogen oxides and reducing agents in the cement kiln flue gas, the less the catalyst is blocked, and the higher the denitration efficiency, it is necessary to add a flue gas deflector at the inlet of the denitration reactor to make the nitrogen oxides, reducing agents and dust in the flue gas evenly pass through the reactor to improve the denitration efficiency. Since the conventional grid-type deflector only has a guiding function and cannot play a turbulence-generating role, the reducing agent and nitrogen oxides in the flue gas are not fully mixed, the concentrated dust cannot be dispersed, the catalyst is easily blocked, and the denitration efficiency is affected. Therefore, in the high-temperature and high-dust denitration of cement, the denitration effect of the conventional grid-type deflector is greatly reduced. Summary of the Utility Model

[0003] In order to overcome the problem that in the process of using the flue gas rectifying device, due to the fact that the conventional grid-type deflector only has a guiding function and cannot play a turbulence-generating role, the reducing agent and nitrogen oxides in the flue gas are not fully mixed, the concentrated dust cannot be dispersed, the catalyst is easily blocked, and the denitration efficiency is affected. Therefore, in the high-temperature and high-dust denitration of cement, the denitration effect of the conventional grid-type deflector is greatly reduced.

[0004] The technical solution of the utility model is as follows: A flue gas rectifying device at the inlet of a high-temperature and high-dust denitration reactor of a cement kiln includes a grid deflector; it also includes a grid support beam and a reactor inlet flue wall plate. A grid support beam for fixed connection is arranged at the front end of the grid deflector, and a reactor inlet flue wall plate installed at the flue opening is arranged outside the grid deflector.

[0005] Preferably, through multiple sets of arrangements of the deflector, a rectifying grid is formed. At the same time, multiple sets of deflectors are installed on the grid support beam in an inverted V shape. After the flue gas passes through the inverted V-shaped rectifying grid, turbulence is generated, so that the nitrogen oxides, reducing agents and dust in the flue gas evenly pass through the reactor, improving the denitration efficiency. And because the structure of the flue gas rectifying device is relatively simple, the installation of the flue gas rectifying device is convenient, and at the same time, the manufacturing and installation costs are reduced.

[0006] Preferably, multiple sets of grille deflectors are provided to form a rectifying grille, and the grille deflectors are installed on the grille support beam in an inverted V structure. When the flue gas rectifying device is in use, the flue gas forms a turbulent flow after passing through the inverted V-shaped rectifying grille, enabling the nitrogen oxides, reducing agents, and dust in the flue gas to evenly pass through the reactor, thereby improving the denitrification efficiency.

[0007] Preferably, multiple sets of grille support beams are equidistantly arranged at the front end of the grille deflectors, and the grille support beams are arranged inside the wall panel of the reactor inlet flue.

[0008] Preferably, the grille deflectors, grille support beams, and the wall panel of the reactor inlet flue are all arranged inside the flue.

[0009] 1. By installing multiple sets of deflectors in an inverted V shape on the grille support beam, the flue gas forms a turbulent flow after passing through the inverted V-shaped rectifying grille, enabling the nitrogen oxides, reducing agents, and dust in the flue gas to evenly pass through the reactor, improving the denitrification efficiency. At the same time, the utilization rate of the reducing agent is significantly increased, catalyst blockage is reduced, and the denitrification efficiency is improved. Moreover, due to the relatively simple structure of the flue gas rectifying device, the installation of the flue gas rectifying device is convenient, and the manufacturing and installation costs are reduced. Description of the Drawings

[0010] Figure 1 The figure shows the front view schematic diagram of the inlet flue gas rectifying device of the high-temperature and high-dust denitrification reactor of the cement kiln of the present invention;

[0011] Figure 2 The figure shows the top view schematic diagram of the inlet flue gas rectifying device of the high-temperature and high-dust denitrification reactor of the cement kiln of the present invention.

[0012] Description of the reference numerals: 1. Grille deflector; 2. Grille support beam; 3. Wall panel of the reactor inlet flue. Detailed Embodiments

[0013] The present invention will be further described below in conjunction with the drawings and embodiments.

[0014] Please refer to Figure 1-2, the present utility model provides an embodiment: a flue gas rectifying device at the inlet of a high-temperature and high-dust denitration reactor for a cement kiln, which includes a grid deflector 1; it also includes a grid support beam 2 and a reactor inlet flue wall panel 3. A grid support beam 2 for fixed connection is arranged at the front end of the grid deflector 1, and a reactor inlet flue wall panel 3 installed at the flue opening is arranged outside the grid deflector 1; multiple groups of grid deflectors 1 are arranged to form a rectifying grid, and the grid deflectors 1 are installed on the grid support beam 2 in an inverted V structure; multiple groups of grid support beams 2 are arranged at equal intervals at the front end of the grid deflectors 1, and the grid support beams 2 are arranged inside the reactor inlet flue wall panel 3; the grid deflectors 1, the grid support beams 2, and the reactor inlet flue wall panels 3 are all arranged in the flue. Through the assembly of multiple groups of grid deflectors 1, a rectifying grid is formed, and the grid deflectors 1 are installed on the grid support beam 2 in an inverted V shape. After the flue gas passes through the inverted V-shaped deflector, a turbulent flow is formed, enabling the reductant to be fully mixed with the nitrogen oxides in the flue gas, dispersing the concentrated dust in the flue gas. At the same time, the inverted V-shaped grid deflectors 1 are arranged in a grid in the flue, and the flue gas and the dust in the flue gas can enter the reactor evenly, reducing the blockage of the catalyst in the reactor.

[0015] When working, through the assembly of multiple groups of grid deflectors 1, a rectifying grid is formed, and the grid deflectors 1 are installed on the grid support beam 2 in an inverted V shape. After the flue gas passes through the inverted V-shaped deflector, a turbulent flow is formed, enabling the reductant to be fully mixed with the nitrogen oxides in the flue gas, dispersing the concentrated dust in the flue gas. At the same time, the inverted V-shaped deflector grid deflectors 1 are arranged in a grid in the flue, and the flue gas and the dust in the flue gas can enter the reactor evenly, reducing the blockage of the catalyst in the reactor, solving the problems of insufficient mixing of nitrogen oxides and reductant in the flue gas and uneven dust distribution, significantly improving the utilization rate of the reductant, reducing catalyst blockage, and improving the denitration efficiency.

[0016] Through the above steps, with multiple groups of grid deflectors 1 arranged, a rectifying grid is formed. At the same time, multiple groups of grid deflectors 1 are installed on the grid support beam 2 in an inverted V shape. After the flue gas passes through the inverted V-shaped rectifying grid, a turbulent flow is formed, enabling the nitrogen oxides, reductant, and dust in the flue gas to pass through the reactor evenly, improving the denitration efficiency. And because the structure of the flue gas rectifying device is relatively simple, the installation of the flue gas rectifying device is convenient, and at the same time, the manufacturing and installation costs are reduced.

[0017] The above has described the embodiments of the present utility model in detail in conjunction with the drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the purpose of the present utility model.

Claims

1. A flue gas rectification device for an inlet of a high-temperature and high-dust denitrification reactor of a cement kiln, comprising a grid guide plate (1); characterized in that: It also comprises a grille support beam (2) and a reactor inlet flue wall plate (3); the front end of the grille guide plate (1) is provided with a grille support beam (2) for fixed connection; the outer side of the grille guide plate (1) is provided with a reactor inlet flue wall plate (3) installed at the flue port; the grille guide plate (1) is provided with a plurality of groups of rectifying grilles, and the grille guide plate (1) is installed on the grille support beam (2) in an inverted V structure.

2. The inlet flue gas rectification device of the high-temperature and high-dust denitrification reactor of a cement kiln according to claim 1 is characterized in that: A plurality of grid support beams (2) are arranged at equal intervals at the front end of the grid guide plate (1), and the grid support beams (2) are arranged in the reactor inlet flue wall plate (3).

3. The inlet flue gas rectification device of the cement kiln high-temperature and high-dust denitrification reactor according to claim 1 is characterized in that: The grid guide plate (1), the grid support beam (2) and the reactor inlet flue wall plate (3) are all arranged in the flue.

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