CN217248029U - Low-temperature SCR denitration device capable of reducing carbon emission - Google Patents

Low-temperature SCR denitration device capable of reducing carbon emission Download PDF

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Publication number
CN217248029U
CN217248029U CN202220229283.7U CN202220229283U CN217248029U CN 217248029 U CN217248029 U CN 217248029U CN 202220229283 U CN202220229283 U CN 202220229283U CN 217248029 U CN217248029 U CN 217248029U
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smoke inlet
tower body
flue gas
wall
arc
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CN202220229283.7U
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张轩
苏醒
黄玩湖
徐立洁
李军民
张纪超
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Shanghai Shwatcher Environmental Protection Technology Co ltd
Shanghai Watcher Intelligent System Co ltd
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Shanghai Shwatcher Environmental Protection Technology Co ltd
Shanghai Watcher Intelligent System Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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Abstract

The application discloses reduce low temperature SCR denitrification facility that carbon discharged includes: a tower body having a smoke inlet and a smoke outlet; a smoke inlet pipeline connected with the smoke inlet through an arc-shaped bent pipe; the reducing agent distribution device is fixedly installed in the smoke inlet pipeline and is at a preset distance from the smoke inlet; a baffle; the first end surface of the guide plate is attached to the inner side inner wall of the arc-shaped bent pipe, and the second end surface of the guide plate is the same as the outer side inner wall of the arc-shaped bent pipe in shape; the multilayer catalyst layer is arranged in the smoke inlet pipeline tower body; and the soot blowers are arranged on the inner wall of the tower body. The flow guide plate changes the movement direction of the flue gas and improves the uniformity of the distribution of flue gas particles, the flow field is uniformly distributed by reducing the speed deviation, the temperature deviation and the pressure deviation of the flue gas, the speed of the flue gas flow flowing through the catalyst layer is uniform, the flue gas is fully contacted with the catalyst, and the denitration efficiency is improved; and catalytic reaction is carried out without using an indirect or direct heating device to provide heat.

Description

Low-temperature SCR denitration device capable of reducing carbon emission
Technical Field
The application relates to the technical field of SCR denitration devices, in particular to a low-temperature SCR denitration device capable of reducing carbon emission.
Background
SCR (selective Catalytic reduction) is a selective Catalytic reduction technology, is a method for denitration after a furnace, and specifically reduces NOx (mainly NO) into N under the action of a catalyst by utilizing the reduction function of ammonia on NOx 2 And water to achieve the purpose of denitration.
At present, a high-temperature or medium-low-temperature SCR process is mostly adopted in an SCR denitration system, for example, the high-temperature SCR process is adopted, and a direct or indirect heating device is required to be used for heating to reach a catalyst denitration temperature window of 300-420 ℃; by adopting a medium-low temperature SCR process, the temperature needs to be raised to a catalyst denitration temperature window of 220-280 ℃ by using a direct or indirect heating device, and the temperature is raised to above 320 ℃ by configuring catalyst heat reanalysis. In the heating process, the temperature of the two processes must be raised to the temperature required by the reaction by using an indirect or direct heating device, which undoubtedly consumes energy, increases carbon emission and pollutes the atmosphere.
SUMMERY OF THE UTILITY MODEL
The application provides a reduce low temperature SCR denitrification facility that carbon discharged to there is the problem that needs to increase direct or indirect heating device and then consumes the energy and increase carbon emission in current SCR deNOx systems of solution.
The technical scheme adopted by the application is as follows:
a low temperature SCR denitration device that reduces carbon emissions, comprising:
a tower body having a smoke inlet and a smoke outlet;
a smoke inlet pipeline connected with the smoke inlet through an arc-shaped bent pipe;
a smoke outlet pipeline connected with the smoke outlet;
the reducing agent distribution device is fixedly arranged in the smoke inlet pipeline and is away from the smoke inlet by a preset distance;
a baffle; the first end surface of the guide plate is attached to the inner side inner wall of the arc-shaped bent pipe, and the second end surface of the guide plate is the same as the outer side inner wall of the arc-shaped bent pipe in shape;
a plurality of catalyst layers arranged in the tower body of the smoke inlet pipeline;
and the soot blowers are arranged on the inner wall of the tower body.
Furthermore, the arc-shaped elbow is a circular right-angle elbow, one end of the guide plate, which is close to the tower body, is provided with an extension section, and the height of the extension section is gradually reduced along the flow direction of the fluid; the tower is internal and be close to the position of extension section is provided with the rectification grid, the rectification grid is the array by a plurality of cuboid grid units and arranges and form, every the cuboid grid unit has horizontal steel sheet and vertical steel sheet to connect and forms.
Further, reducing agent distributor includes along the fluid flow direction, fixed connection in proper order ammonia injection grid and blender device, the ammonia injection grid is formed by many seamless pipes being the array arrangement, including a plurality of disc type mixers in the blender device, disc type mixer includes the disc and follows a plurality of triangle-shaped blades of disc circumferencial direction evenly distributed, triangle-shaped blade interconnect between the disc type mixer.
Further, the preset distance is 10-12 times of the equivalent diameter of the smoke inlet pipeline.
Further, the catalyst layer includes three-layer catalyst layer and the reserve catalyst layer of one deck, three-layer catalyst layer with tower body inner wall fixed connection, the reserve catalyst layer of one deck with tower body inner wall sliding connection, and be located the rectification grid with between the three-layer catalyst layer.
The technical scheme of the application has the following beneficial effects:
according to the guide plate arranged in the low-temperature SCR denitration device, the guide plate changes the movement direction of the flue gas and improves the uniformity of the distribution of flue gas particles, and the uniformity of the distribution of a flow field is improved by reducing the speed deviation, the temperature deviation and the pressure deviation of the flue gas; when the flow field is uniformly distributed, the speed of the flue gas flow flowing through the catalyst layer is uniform, and the flue gas is fully contacted with the catalyst, so that the denitration efficiency is improved; and catalytic reaction is carried out without using an indirect or direct heating device to provide heat;
according to the reducing agent distribution device arranged in the low-temperature SCR denitration device, the reducing agent ammonia distributed in the flue is more uniform, and the ammonia gas and the flue gas are mixed and then form turbulence through the plurality of fixed disc mixers, so that the ammonia gas and the flue gas are fully mixed;
this application low temperature SCR denitrification facility sets up's rectification grid, the flue gas air current flows through the rectification grid, and the flue gas flow direction that flows out the rectification grid is vertical downwards basically, makes the metal catalyst granule that is arranged in the catalyst layer of rectification grid below not receive the erosion, reduces the wearing and tearing to the catalyst granule, improves the life of catalyst, improves low temperature SCR denitrification facility's denitration efficiency.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a low-temperature SCR denitration device for reducing carbon emission according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a baffle and a rectifying grid provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of the disc mixer provided in the embodiment of the present application.
Illustration of the drawings:
the system comprises a tower body 1, a reducing agent distribution device 2, a guide plate 3, a rectifying grid 4, a catalyst layer 5 and a soot blower 6.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Furthermore, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or device that comprises a list of elements is not necessarily limited to those elements explicitly listed, but may include other elements not expressly listed or inherent to such product or device.
Referring to fig. 1, a schematic structural diagram of a low-temperature SCR denitration device for reducing carbon emission according to an embodiment of the present application is shown; FIG. 2 is a schematic diagram of a baffle and a rectifying grid provided in an embodiment of the present application; fig. 3 is a schematic structural diagram of a disc mixer provided in an embodiment of the present application.
The low-temperature SCR denitration device capable of reducing carbon emission provided by the embodiment comprises: a tower body 1 with a smoke inlet and a smoke outlet; a smoke inlet pipeline connected with the smoke inlet through an arc-shaped bent pipe; a smoke outlet pipeline connected with the smoke outlet; the reducing agent distribution device 2 is fixedly installed in the smoke inlet pipeline and is away from the smoke inlet by a preset distance; a baffle 3; the first end face of the guide plate 3 is attached to the inner side inner wall of the arc-shaped bent pipe, and the second end face of the guide plate 3 is the same as the outer side inner wall of the arc-shaped bent pipe in shape; a plurality of catalyst layers 5 arranged in the tower body 1 of the smoke inlet pipeline; and the soot blowers 6 are arranged on the inner wall of the tower body 1.
Specifically, the method comprises the following steps of;
reducing agent distribution device 2 includes along the fluid flow direction, fixed connection in proper order ammonia injection grid and mixer device, the ammonia injection grid is the array by many seamless pipes and arranges and form, including a plurality of disc type mixers in the mixer device, the disc type mixer includes the disc and follows a plurality of triangle-shaped blades of disc circumferencial direction evenly distributed, triangle-shaped blade interconnect between the disc type mixer. The reducing agent filled in the reducing agent distribution device 2 is ammonia water or urea. According to the actual situation, the preset distance is 10-12 times of the equivalent diameter of the smoke inlet pipeline, and the mixing deviation of the reducing agent ammonia and the smoke in the SCR denitration device is not more than +/-3%.
As shown in fig. 2, the arc-shaped elbow is a round right-angle elbow, and one end of the baffle 3 close to the tower body 1 is provided with an extension section, and the height of the extension section gradually decreases along the direction of fluid flow; just be close to in the tower body 1 the position of extension section is provided with rectification grid 4, rectification grid 4 is array by a plurality of cuboid grid unit and arranges and form, every the cuboid grid unit has horizontal steel sheet and vertical steel sheet to connect and forms.
Catalyst layer 5 includes three-layer catalyst layer and the reserve catalyst layer of one deck, three-layer catalyst layer with 1 inner wall fixed connection of tower body, the reserve catalyst layer of one deck with 1 inner wall sliding connection of tower body, and be located rectification grid 4 with between the three-layer catalyst layer. When the catalyst is operated for a long time at low temperature, ammonium bisulfate generated by the reaction is deposited in the gaps of the catalyst, and the activity of the catalyst is permanently changed. Therefore, when ash deposition due to deposition of ammonium bisulfate occurs, the sootblowing frequency of the sootblower 6 is increased.
In this embodiment, the reducing agent distribution device 2 is disposed in the smoke inlet pipe, when the smoke passes through the reducing agent distribution device 2 via the reducing agent distribution device 2, the smoke is mixed with the reducing agent sprayed by the ammonia injection grid, and after being uniformly mixed by the mixer device, the smoke sequentially flows through the guide plate 3 and the rectification grid 4, the smoke with uniform flow field and substantially vertical airflow direction flows into the catalyst layer 5, and the catalyst with low temperature activity and ammonium bisulfate decomposition capability (the specific component of the catalyst includes V) 2 O 5 -WO 3 、 MoO 3 /TiO 2 I.e. as TiO 2 As a carrier, V 2 O 5 As an active ingredient, WO 3 、MoO 3 And the other adjuvant is a coagent. ) Further decomposing NOx of mixed flue gas into N 2 And H 2 And O achieves the purpose of removing NOx in the flue gas.
In this embodiment, the guide plate arranged in the low-temperature SCR denitration device changes the movement direction of the flue gas and improves the uniformity of the distribution of flue gas particles, and the uniformity of the distribution of a flow field is improved by reducing the speed deviation, the temperature deviation and the pressure deviation of the flue gas; when the flow field is uniformly distributed, the speed of the flue gas flow flowing through the catalyst layer is uniform, and the flue gas is fully contacted with the catalyst, so that the denitration efficiency is improved; and catalytic reaction is carried out without using an indirect or direct heating device to provide heat.
In this embodiment, the reductant distribution device that this application low temperature SCR denitrification facility set up arranges out the ammonia at the flue more evenly, and ammonia forms the torrent through a plurality of fixed disc mixers after mixing with the flue gas for ammonia and flue gas intensive mixing.
In this embodiment, the rectification grid that this application low temperature SCR denitrification facility set up, flue gas air current flow through the rectification grid, and the flue gas flow direction that flows out the rectification grid is vertical downwards basically, makes the metal catalyst granule that is located in the catalyst layer of rectification grid below not receive the erosion, reduces the wearing and tearing to the catalyst granule, improves the life of catalyst, improves low temperature SCR denitrification facility's denitration efficiency.
The denitration device provided by the embodiment of the application is used for treating low-temperature flue gas in general non-electric industry. The temperature window of the low-temperature flue gas is over 150 ℃ generally, and the concentration of NOx is 0-2000 mg/Nm 3 The concentration of sulfur dioxide is not higher than 2000mg/Nm 3 And the amount of smoke dust is 0 to 100000mg/Nm 3 . By adopting the low-temperature SCR denitration system, the denitration efficiency is generally not lower than 50-95%, the temperature drop of a smoke outlet is not more than 10 ℃, the ammonia escape is less than 3ppm, and the low-temperature SCR denitration system can be arranged in front of a discharge chimney of a main production device, and does not need to consume primary energy to increase a heating device and a thermal desorption system device, so that the carbon emission is reduced; meanwhile, the SCR denitration device is prevented from being blocked by dust and the smoke resistance is reduced through the soot blower.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.

Claims (5)

1. A low temperature SCR denitrification facility that reduces carbon emissions, characterized by comprising:
a tower body having a smoke inlet and a smoke outlet;
a smoke inlet pipeline connected with the smoke inlet through an arc-shaped bent pipe;
a smoke outlet pipeline connected with the smoke outlet;
the reducing agent distribution device is fixedly arranged in the smoke inlet pipeline and is away from the smoke inlet by a preset distance;
a baffle; the first end surface of the guide plate is attached to the inner side inner wall of the arc-shaped bent pipe, and the second end surface of the guide plate is the same as the outer side inner wall of the arc-shaped bent pipe in shape;
a plurality of catalyst layers arranged in the tower body of the smoke inlet pipeline;
and the soot blowers are arranged on the inner wall of the tower body.
2. The low-temperature SCR denitration device for reducing carbon emission according to claim 1, wherein the arc-shaped elbow is a circular right-angle elbow, one end of the flow guide plate close to the tower body is provided with an extension section, and the height of the extension section is gradually reduced along the flowing direction of the fluid; the tower is internal and be close to the position of extension section is provided with the rectification grid, the rectification grid is the array by a plurality of cuboid grid units and arranges and form, every the cuboid grid unit has horizontal steel sheet and vertical steel sheet to connect and forms.
3. The low-temperature SCR denitration device for reducing carbon emission according to claim 1, wherein the reducing agent distribution device comprises an ammonia injection grid and a mixer device which are sequentially and fixedly connected along a fluid flow direction, the ammonia injection grid is formed by arranging a plurality of seamless pipes in an array manner, the mixer device comprises a plurality of disc mixers, each disc mixer comprises a disc and a plurality of triangular blades which are uniformly distributed along the circumferential direction of the disc, and the triangular blades between the disc mixers are connected with each other.
4. The low-temperature SCR denitration device for reducing carbon emission of claim 3, wherein the predetermined distance is 10 to 12 times the equivalent diameter of the flue gas inlet pipe.
5. The low-temperature SCR denitration device for reducing carbon emission according to claim 2, wherein the catalyst layer comprises three catalyst layers and a spare catalyst layer, the three catalyst layers are fixedly connected with the inner wall of the tower body, and the spare catalyst layer is slidably connected with the inner wall of the tower body and is located between the rectification grid and the three catalyst layers.
CN202220229283.7U 2022-01-27 2022-01-27 Low-temperature SCR denitration device capable of reducing carbon emission Active CN217248029U (en)

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CN202220229283.7U CN217248029U (en) 2022-01-27 2022-01-27 Low-temperature SCR denitration device capable of reducing carbon emission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202220229283.7U CN217248029U (en) 2022-01-27 2022-01-27 Low-temperature SCR denitration device capable of reducing carbon emission

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CN217248029U true CN217248029U (en) 2022-08-23

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