SCR (Selective Catalytic Reduction) reactor
By adding a mixing device and a multi-layer catalytic device to the SCR reactor, combined with a vibrating ash cleaner, the problems of uneven flue gas mixing and particulate matter accumulation are solved, and more efficient catalytic effects and longer equipment life are achieved.
Patent Information
- Application Number
- CN202420820338.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-19
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-04-19
AI Technical Summary
The existing SCR reactors have poor effect on flue gas filtration and reducing agent mixing with flue gas, which affects the catalytic effect, and the accumulation of particulate matter causes catalyst wear and clogging, making it difficult to clean.
A SCR reactor including a shell, an ammonia injection device, a dust removal device, a catalytic device and a mixing device is designed to promote uniform mixing of reducing agent and flue gas by pneumatically driven mixing device, and to clean the reducing agent and vibrating ash through a multi-layer catalytic device and vibration. The unit extends the cleaning cycle to ensure smooth air flow and effective dust cleaning.
The uniform mixing of reducing agent and flue gas is achieved, the service life of the catalyst is extended, the temperature is avoided, the catalytic effect and work efficiency are improved, and the dust is cleaned and repaired.
Smart Images
Figure CN222173663U_ABST
Abstract
Description
Technical field:
[0001] The utility model relates to the technical field of environmental protection treatment of combustion flue gas, in particular to an SCR reactor. Background technology:
[0002] The SCR reactor is the core equipment of the flue gas denitrification system. Its main function is to carry the catalyst and provide space for the denitrification reaction. At the same time, it ensures the smooth flow of flue gas and the uniform distribution of airflow to create conditions for the smooth progress of the denitrification reaction.
[0003] The working principle of the SCR reactor is to mix vaporized ammonia with air to obtain a reducing agent. The reducing agent and the flue gas react under the influence of the internal catalytic device to remove nitrogen oxides in the flue gas. However, in the production process, the reducing agent and the flue gas can only react under the action of the catalyst after being mixed. Due to the influence of the ammonia injection position and the airflow inside the reactor, the reducing agent and the flue gas cannot be mixed evenly, affecting the catalytic effect. At the same time, the flue gas may contain particulate matter such as dust. When the equipment has been running for a long time, the particulate matter will cause wear and blockage of the catalyst, affecting the catalytic effect. The particulate matter accumulates in the catalytic device and the reactor and is inconvenient to clean. Utility model content:
[0004] The technical problem to be solved by the utility model is that the existing SCR reactor cannot effectively filter the flue gas and the mixing effect of the reducing agent and the flue gas is not good, which affects the catalytic effect.
[0005] In order to solve the above technical problems, the utility model provides a technical solution: an SCR reactor, including a shell, an ammonia spraying device, a dust removal device, a catalytic device and a mixing device, characterized in that: the shell is divided into an air inlet chamber, a catalytic chamber and an air outlet chamber from top to bottom,
[0006] The mixing device comprises a rotating shaft, a paddle and a mixing blade, wherein the rotating shaft is coaxially arranged in the housing, the top end of the rotating shaft is connected to the housing through a first sealing bearing, the other end of the rotating shaft passes through the air inlet chamber and the catalytic chamber and is connected to the housing through a second sealing bearing, the paddles are evenly distributed on the rotating shaft in the air inlet chamber, and the mixing blades are evenly distributed on the rotating shaft in the catalytic chamber;
[0007] An air inlet channel connected to the air inlet cavity is disposed at the top of one side of the shell, the axis of the air inlet channel corresponds to the blade, so that the gas entering through the air inlet channel drives the rotating shaft to rotate, the air outlet cavity is an italic structure, and the large end of the italic structure is connected to the air outlet channel;
[0008] The dust removal device, the ammonia injection device and the catalytic device are arranged in sequence in the catalytic chamber from top to bottom, and the mixing blade is located between the ammonia injection device and the catalytic device.
[0009] Furthermore, the catalytic device has at least two layers, and is arranged in upper and lower intervals in the catalytic chamber.
[0010] Furthermore, a manhole is provided on the shell corresponding to the catalytic device, and an inspection platform is provided outside the shell corresponding to the manhole.
[0011] Furthermore, a pressure transmitter is provided in the catalytic chamber.
[0012] Furthermore, a vibrating dust cleaner is provided at the lower end of the italic structure.
[0013] Furthermore, the diameter of the gas outlet channel is greater than the diameter of the gas outlet port and the gas outlet channel is bent upward, and a dust hopper is connected to the lowest point where the gas outlet channel is connected to the gas outlet cavity.
[0014] Furthermore, a rectifying plate is provided at the connection between the air inlet chamber and the catalytic chamber.
[0015] The beneficial effects of the utility model are:
[0016] 1. The present application adds a mixing device to the existing reactor and changes the air intake direction, thereby promoting the full mixing of the reducing agent and the flue gas in the catalytic chamber by pneumatically driving the mixing device, thereby promoting the catalytic effect.
[0017] 2. In the present application, the rotating shaft is coaxially rotatably arranged in the shell. Since the axis of the air intake passage corresponds to the paddle blade, the gas entering through the air intake passage is blocked by the paddle blade, thereby driving the rotating shaft to rotate. The rotating shaft drives the mixing blades to rotate at the same time, promoting the mixing of the gas in the ammonia injection device and the catalytic device, thereby ensuring the mixing uniformity of the reducing agent and the flue gas and ensuring the catalytic quality.
[0018] 3. The dust removal device of the present application can filter the flue gas entering the catalytic chamber, reduce the content of particulate matter in the flue gas entering the catalytic chamber, extend the cleaning cycle of the catalyst, and improve work efficiency. At the same time, the air outlet cavity is an italic structure, and the dust falling during cleaning can be easily gathered to the bottom through the slope, which is convenient for subsequent cleaning.
[0019] 4. In the present application, at least two layers of catalytic devices are arranged in the catalytic chamber at intervals, and an ammonia injection device is provided on the upper side of each layer of catalyst, which can make the high concentration of NOx in the flue gas and NH3 catalytically react step by step, thereby avoiding the high concentration of NOx and NH3 to react at one time to generate a large amount of heat, avoiding the rapid deactivation of the catalyst due to excessive concentration of heat and rapid temperature increase, and eliminating the occurrence of temperature runaway, so that the catalyst can catalyze the reaction within a relatively stable temperature range.
[0020] 5. The setting of manholes and maintenance platforms in this application facilitates people to enter for maintenance, dust cleaning and other operations to ensure filtering and catalytic effects.
[0021] 6. The setting of the pressure transmitter in this application can clean the dust on the filtering device and the catalytic device to prevent poor airflow due to blockage, which affects the catalytic effect. At the same time, a vibrating dust cleaner is provided at the lower end of the italic structure, which promotes the cleaned dust to slide down the slope through vibration, making it easier for subsequent cleaning.
[0022] 7. In the present application, the diameter of the air outlet channel is larger than the diameter of the air outlet and the air outlet channel is bent upward. When the smoke in the air outlet cavity enters the air outlet channel through the narrow air outlet, the air flow velocity first increases and then decreases, which facilitates the dust brought out by the air flow to settle in the air outlet channel and fall to the bottom of the air outlet channel. Since the air outlet channel is bent upward and an ash hopper is provided at the bottom, the dust is easy to slide into the ash hopper for storage, thereby reducing the content of particulate matter in the exhaust smoke.
[0023] 8. In the present application, a rectifier plate is provided at the connection between the air intake chamber and the catalytic chamber. The rectifier plate ensures that the airflow flows vertically downward. Since the smoke pushes the rotating shaft, the airflow becomes very unstable. The smoke in the air intake chamber is rectified to ensure that the airflow enters the catalytic chamber in a stable direction. At the same time, a rectifier plate can also be provided between the catalytic device and the mixing blades, and the mixed smoke enters the catalytic device after rectification.
[0024] In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. Description of the drawings:
[0025] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only two of the drawings in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0026] Figure 1 This is a structural diagram of this application.
[0027] Figure 2 for Figure 1 Axial cross-sectional view.
[0028] In the figure: 1-shell, 2-ammonia spraying device, 3-dust removal device, 4-catalytic device, 5-mixing device, 6-air inlet channel, 7-air outlet channel, 8-maintenance platform, 9-pressure transmitter, 10-vibrating dust cleaner, 11-ash hopper, 12-rectifier plate, 13-air outlet;
[0029] 51 - rotating shaft, 52 - blade, 53 - mixing blade, 54 - first sealed bearing, 55 - second sealed bearing. Specific implementation method:
[0030] The embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.
[0031] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.
[0032] The names of the messages or information exchanged between multiple devices in the implementation manner of the present utility model are only used for illustrative purposes, and are not used to limit the scope of these messages or information.
[0033] Embodiment 1
[0034] like Figure 1-2 As shown, an SCR reactor includes a housing 1, an ammonia spraying device 2, a dust removal device 3, a catalytic device 4 and a mixing device 5. The housing 1 is divided into an air inlet chamber, a catalytic chamber and an air outlet chamber from top to bottom.
[0035] The mixing device 5 comprises a rotating shaft 51, a paddle 52 and a mixing blade 53. The rotating shaft 51 is coaxially arranged in the housing 1. The top end of the rotating shaft 51 is connected to the housing 1 through a first sealed bearing 54. The other end of the rotating shaft 51 passes through the air inlet chamber and the catalytic chamber and is connected to the housing 1 through a second sealed bearing 55. The paddle 52 is evenly distributed on the rotating shaft 51 in the air inlet chamber, and the mixing blade 53 is evenly distributed on the rotating shaft 51 in the catalytic chamber.
[0036] An air inlet channel 6 connected to the air inlet cavity is provided at the top of one side of the housing 1. The axis of the air inlet channel 6 corresponds to the paddle 52, so that the gas entering through the air inlet channel 6 drives the rotating shaft 51 to rotate. The air outlet cavity is an italic structure, and the large end of the italic structure is connected to the air outlet channel 7 through the air outlet 13. The air outlet cavity is an italic structure, and the dust falling during dust cleaning can be easily gathered to the bottom through the slope, which is convenient for subsequent cleaning.
[0037] The dust removal device 3 (filter for filtering particulate matter), the ammonia spraying device 2 (for spraying ammonia water or ammonia gas) and the catalytic device 4 (the built-in catalyst is in the form of honeycomb or plate type for reduction reaction) are arranged in the catalytic chamber from top to bottom. The dust removal device 3 can filter the flue gas entering the catalytic chamber, reduce the content of particulate matter in the flue gas entering the catalytic chamber, extend the cleaning cycle of the catalyst, and improve work efficiency; the mixing blade 53 is between the ammonia spraying device 2 and the catalytic device 4; the rotating shaft 51 is coaxially rotatably arranged in the shell 1. Since the axis of the air intake channel 6 corresponds to the blade 52, the gas entering through the air intake channel 6 is blocked by the blade 52, thereby driving the rotating shaft 51 to rotate, and the rotating shaft 51 drives the mixing blade 53 to rotate at the same time, promoting the mixing of the gas between the ammonia spraying device 2 and the catalytic device 4, thereby ensuring the mixing uniformity of the reducing agent and the flue gas and ensuring the catalytic quality.
[0038] Among them, a manhole is opened on the shell 1 corresponding to the catalytic device 4, and an inspection platform 8 is arranged outside the shell 1 corresponding to the manhole; the setting of the manhole and the inspection platform 8 facilitates people to enter for inspection, cleaning and other operations to ensure the filtering and catalytic effects.
[0039] Among them, a pressure transmitter 9 is arranged in the catalytic chamber, and a vibrating dust cleaner 10 is arranged at the lower end of the italic structure; the setting of the pressure transmitter 9 can clean the dust on the filtering device and the catalytic device 4 to prevent the air flow from being blocked and affecting the catalytic effect. At the same time, a vibrating dust cleaner 10 is arranged at the lower end of the italic structure, which promotes the cleaned dust to slide down the slope through vibration, so as to facilitate subsequent cleaning.
[0040] Embodiment 2
[0041] like Figure 2 As shown, this embodiment is obtained by describing in detail the technical features such as the catalytic device 4 on the basis of the embodiment one. The remaining technical features are the same as those of the embodiment one, and the similarities are not repeated here. Among them, the difference between this embodiment and the embodiment one is that the catalytic device 4 has at least two layers and is arranged in upper and lower intervals in the catalytic chamber.
[0042] In this embodiment, at least two layers of catalytic devices 4 are arranged in the catalytic chamber at intervals, and an ammonia injection device 2 is provided on the upper side of each layer of catalyst, so that the high concentration of NOx in the flue gas can react with NH3 step by step, thereby avoiding the high concentration of NOx and NH3 to react at one time to generate a large amount of heat, avoiding the rapid deactivation of the catalyst due to excessive concentration of heat and rapid temperature increase, and eliminating the occurrence of temperature runaway, so that the catalyst can catalyze the reaction within a relatively stable temperature range.
[0043] Embodiment 3
[0044] like Figure 1-2 As shown, this embodiment is obtained by describing in detail technical features such as the air outlet channel 7 on the basis of the second embodiment. The remaining technical features are the same as those of the second embodiment, and the similarities are not repeated here. The difference between this embodiment and the second embodiment is that the diameter of the air outlet channel 7 is larger than the diameter of the air outlet 13 and the air outlet channel 7 is bent upward, and the lowest point where the air outlet channel 7 is connected to the air outlet cavity is connected to the ash hopper 11.
[0045] In this embodiment, the diameter of the air outlet channel 7 is larger than the diameter of the air outlet port 13 and the air outlet channel 7 is bent upward. When the smoke in the air outlet cavity enters the air outlet channel 7 through the narrow air outlet port 13, the air flow velocity first increases and then decreases, so that the dust brought out by the air flow is precipitated in the air outlet channel 7 and falls to the bottom of the air outlet channel 7. Since the air outlet channel 7 is bent upward and an ash hopper 11 is provided at the bottom, the dust is easy to slide into the ash hopper 11 for storage, thereby reducing the content of particulate matter in the exhaust smoke.
[0046] Embodiment 4
[0047] like Figure 2 As shown, this embodiment is obtained by adding technical features such as a rectifier plate 12 on the basis of the third embodiment. The remaining technical features are the same as those of the third embodiment, and the similarities are not repeated here. Among them, the difference between this embodiment and the third embodiment is that a rectifier plate 12 is provided at the connection between the air intake chamber and the catalyst chamber.
[0048] In this embodiment, the rectifying plate 12 ensures that the airflow is vertically downward. Since the smoke pushes the rotating shaft 51, the airflow becomes very unstable, and the smoke in the air intake chamber is rectified to ensure that the airflow enters the catalytic chamber in a stable direction. At the same time, a rectifying plate 12 can also be arranged between the catalytic device 4 and the mixing blades 53, and the mixed smoke enters the catalytic device 4 after rectification.
[0049] The overall technical solution formed by the above-mentioned embodiments is used as follows: after the flue gas enters the air intake chamber from the air intake channel 6, the rotating shaft 51 is driven to rotate by the paddle 52 and the mixing blade 53 is driven to rotate. The flue gas in the air intake chamber is rectified by the rectifier plate 12 and then filtered by the filter device. The filtered flue gas is stirred and mixed with the sprayed reducing agent by the mixing blade 53 when passing through the ammonia spray device 2. The mixed flue gas is reacted by the catalytic device 4. The reacted flue gas is stirred and mixed with the sprayed reducing agent by the mixing blade 53 when passing through the ammonia spray device 2. The mixed flue gas is reacted again by the catalytic device 4. The flue gas after the second reaction enters the air outlet chamber and is then discharged through the air outlet channel 7.
[0050] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims
1. An SCR reactor, comprising a shell, an ammonia injection device, a dust removal device, a catalytic device and a mixing device, Its characteristics are: The shell is divided into an air inlet chamber, a catalytic chamber and an air outlet chamber from top to bottom; The mixing device comprises a rotating shaft, a paddle and a mixing blade, wherein the rotating shaft is coaxially arranged in the housing, the top end of the rotating shaft is connected to the housing through a first sealing bearing, the other end of the rotating shaft passes through the air inlet chamber and the catalytic chamber and is connected to the housing through a second sealing bearing, the paddles are evenly distributed on the rotating shaft in the air inlet chamber, and the mixing blades are evenly distributed on the rotating shaft in the catalytic chamber; An air inlet channel connected to the air inlet cavity is disposed at the top of one side of the shell, the axis of the air inlet channel corresponds to the blade, so that the gas entering through the air inlet channel drives the rotating shaft to rotate, the air outlet cavity is an italic structure, and the large end of the italic structure is connected to the air outlet channel; The dust removal device, the ammonia injection device and the catalytic device are arranged in sequence in the catalytic chamber from top to bottom, and the mixing blade is located between the ammonia injection device and the catalytic device.
2. The SCR reactor according to claim 1, Its characteristics are: The catalytic device has at least two layers, and is arranged in an upper and lower spaced relationship in the catalytic cavity.
3. The SCR reactor according to claim 2, Its characteristics are: A manhole is provided on the shell corresponding to the catalytic device, and an inspection platform is arranged outside the shell corresponding to the manhole.
4. The SCR reactor according to claim 3, Its characteristics are: A pressure transmitter is arranged in the catalytic chamber.
5. The SCR reactor according to claim 4, Its characteristics are: A vibrating dust cleaner is arranged at the lower end of the italic structure.
6. The SCR reactor according to claim 5, Its characteristics are: The diameter of the gas outlet channel is greater than the diameter of the gas outlet port and the gas outlet channel bends upward. The lowest point where the gas outlet channel is connected to the gas outlet cavity is connected with a dust hopper.
7. The SCR reactor according to claim 6, Its characteristics are: A rectifying plate is arranged at the connection between the air inlet cavity and the catalytic cavity.