Integrated denitration and dust removal device

Abstract

The application provides a denitration and dust removal integrated device, characterized in that the device is in a pipe type filter catalysis integrated structure form, the filter catalysis integrated pipe comprises an outer wall, an inner wall and a denitration reaction zone between the outer wall and the inner wall, the outer wall is in a metal wire mesh structure, flue gas passes through the outer wall under the blowing of a fan, thereby preventing dust in the flue gas from passing through; the denitration reaction zone stores a denitration catalyst, the flue gas passing through the outer wall contacts the denitration catalyst in the denitration reaction zone and performs a denitration reaction; the inner wall is in a metal wire mesh structure, and the flue gas after the denitration reaction leaves from an opening of the filter catalysis integrated pipe. Compared with the integrated device in the prior art, the denitration and dust removal integrated device is extremely simple in structure, easy to operate and has better dust removal and denitration effects.

Description

Technical Field

[0001] This invention belongs to the field of exhaust gas treatment and purification, and more specifically, relates to an integrated denitrification and dust removal device. Background Technology

[0002] Traditional coal-fired power plants discharge exhaust gas directly into the atmosphere after coal combustion, even after dust removal, desulfurization, and denitrification, which bring the exhaust gas close to or meet emission standards, or even fail to meet them. The discharged gas contains harmful gases such as sulfur dioxide, nitrogen dioxide, and nitric oxide, as well as fine solid impurities such as fly ash, which are lightweight and have small particles.

[0003] Sulfur dioxide, nitrogen oxides, and fine particulate matter are the main culprits in the formation of smog, which can greatly affect residents' health and even threaten their lives. Therefore, it is necessary to perform denitrification and dust removal operations on these exhaust gases, leading to the emergence of a large number of denitrification and dust removal equipment on the market.

[0004] In order to reduce equipment size and increase integration, denitrification and dust removal equipment on the market often adopts an integrated denitrification and dust removal operation. For example, Figure 1a As shown, in the existing technology, a company has launched an integrated denitrification and dust removal device, which integrates a dust removal chamber and a denitrification reaction device. For example... Figure 1b As shown, another company has also launched an integrated denitrification and dust removal device, which integrates a dust removal unit and a denitrification unit.

[0005] The above example is a typical case of denitrification and dust removal equipment in the prior art. In the prior art denitrification and dust removal equipment, it is necessary to deliberately set up a denitrification unit and a dust removal unit in the same equipment, and to precisely set up the connection path between the two units. Therefore, the equipment structure is extremely complex, the operation is troublesome, and the manufacturing and operating costs are also increased. Summary of the Invention

[0006] The embodiments of the present invention provide an integrated denitrification and dust removal device, which is extremely simple in structure and easy to operate compared with the integrated devices in the prior art, and has better dust removal and denitrification effects.

[0007] According to one aspect of the present invention, an integrated denitrification and dust removal device is provided, characterized in that the integrated denitrification and dust removal device is in the form of an integrated filter-catalyst tube, the integrated filter-catalyst tube including an outer wall, an inner wall, and a denitrification reaction zone located between the outer wall and the inner wall, the outer wall being a metal wire mesh structure, through which flue gas passes under the blowing of a fan, thereby blocking the passage of micro-dust in the flue gas; the denitrification reaction zone storing a denitrification catalyst, the flue gas passing through the outer wall contacting the denitrification catalyst in the denitrification reaction zone and undergoing a denitrification reaction; the inner wall being a metal wire mesh structure, the flue gas after the denitrification reaction exiting from the opening of the integrated filter-catalyst tube.

[0008] Specifically, the denitrification reaction is based on the following principle:

[0009] 4NO + 4NH3 + O2 → 4N2 + 6H2O (1)

[0010] NO + NO₂ + 2NH₃ → 2N₂ + 3H₂O (2)

[0011] 2NO2+4NH3+O2→3N2+6H2O (3).

[0012] Furthermore, the outer wall has micropores in its metal mesh structure, forming a micropore array.

[0013] Preferably, the fan blows the flue gas through a spiral airflow, causing the flue gas to flow in a spiral shape before passing through the outer wall. The micropore array in the metal wire mesh structure of the outer wall is also arranged in a corresponding spiral shape. Thus, the flue gas, which is spirally rising, will enter the spiral micropore array in sequence, thereby accelerating the passage of the flue gas through the outer wall.

[0014] Optionally, the denitrification catalyst is nano-sized rutile TiO2, V2O5, or a mixture of TiO2 and V2O5.

[0015] Preferably, the integrated denitrification and dust removal device further includes a rotating mechanism with the centerline of the integrated filter-catalyst tube as the rotation axis. Under the action of the rotating mechanism, the integrated filter-catalyst tube rotates centrifugally. The denitrification catalyst in the denitrification reaction zone will move centrifugally relative to the centerline of the integrated filter-catalyst tube. After hitting the outer wall, it will rebound inward, thereby causing the catalyst to continuously move radially and rotate within the integrated filter-catalyst tube.

[0016] Preferably, a vibrator is installed near the integrated filter-catalyst tube. Under the action of the vibrator, the integrated filter-catalyst tube is made to vibrate up and down, which causes the denitrification catalyst in the denitrification reaction zone to vibrate up and down accordingly.

[0017] In addition, the present invention also provides an integrated denitrification and dust removal device array, which consists of multiple integrated denitrification and dust removal devices in the form of integrated filter and catalytic tubes arranged in rows or columns to form the integrated denitrification and dust removal device array, thereby realizing multi-threaded synchronous dust removal and denitrification.

[0018] In this invention, the outer wall of the integrated filter-catalyst tube, through a metal mesh structure, performs dust removal. Simultaneously, the outer and inner walls of the integrated filter-catalyst tube define a denitrification reaction zone to support the denitrification catalyst, where the denitrification reaction takes place. Therefore, the outer wall of the integrated filter-catalyst tube serves a dual function: both dust removal and defining the denitrification reaction zone. Similarly, the inner wall of the integrated filter-catalyst tube also serves a dual function: defining the denitrification reaction zone and acting as an outlet channel after the denitrification reaction. Unlike existing technologies that require dedicated dust removal, denitrification, and emission zones in integrated denitrification and dust removal equipment, this invention achieves all these functions using a single integrated filter-catalyst tube. This ingenious high integration allows for centrifugal and vibrational movements of the integrated filter-catalyst tube structure, thereby maximizing the catalytic effect of the denitrification catalyst. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be discussed below. Obviously, the technical solutions described in conjunction with the accompanying drawings are only some embodiments of the present invention. For those skilled in the art, other embodiments and their accompanying drawings can be obtained based on the embodiments shown in these drawings without creative effort.

[0020] Figure 1a This diagram illustrates an integrated denitrification and dust removal device provided by a company in the prior art;

[0021] Figure 1b A schematic diagram of an integrated denitrification and dust removal device provided by another company in the prior art is shown;

[0022] Figure 2 A cross-sectional view of an integrated denitrification and dust removal device according to an embodiment of the present invention is shown;

[0023] Figure 3 A top view of an integrated denitrification and dust removal device according to an embodiment of the present invention is shown. Detailed Implementation

[0024] The technical solutions of various embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments described in the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Figure 2 A cross-sectional view of an integrated denitrification and dust removal device according to an embodiment of the present invention is shown. Figure 2 As shown, the integrated denitrification and dust removal device 101 according to an embodiment of the present invention takes the form of an integrated filter-catalyst tube. The outer wall 102 of the integrated filter-catalyst tube adopts a metal wire mesh structure, which acts as a microporous filter. When the fan blows the flue gas across the outer wall 102, the metal wire mesh structure of the outer wall 102 will block the passage of fine dust in the flue gas. At the same time, the gas in the flue gas passes through the micropores in the metal wire mesh and enters the space between the outer wall 102 and the inner wall 103 of the integrated filter-catalyst tube.

[0026] Preferably, as described above, the metal wire mesh structure is provided with micropores, the pore size of which is greater than or equal to 10 μm. In this case, its dust removal efficiency can reach 99.9%, which can basically achieve a good dust removal effect.

[0027] Preferably, the fan can be used in the form of a spiral blower to blow the flue gas, so that the flue gas flows in a spiral shape before passing through the outer wall 102. Correspondingly, the micropore array in the metal wire mesh structure is also arranged in a corresponding spiral shape in the outer wall 102. Thus, the flue gas, which is spirally rising, will enter the spiral micropore array in sequence, thereby accelerating the flue gas to pass through the outer wall 102.

[0028] As mentioned above, the flue gas after being dusted by the metal wire mesh structure of the outer wall 102 enters the denitrification reaction zone 104 between the outer wall 102 and the inner wall 103 of the integrated filter-catalyst tube, where the denitrification reaction takes place.

[0029] The denitrification reaction zone 104 stores a catalyst for the denitrification reaction, such as nano-sized rutile TiO2, V2O5, or a mixture of TiO2 and V2O5. Of course, other active substances can also be incorporated to accelerate the denitrification reaction.

[0030] The denitrification reaction carried out in denitrification reaction zone 104 follows the principle as follows:

[0031] 4NO + 4NH3 + O2 → 4N2 + 6H2O (1)

[0032] NO + NO₂ + 2NH₃ → 2N₂ + 3H₂O (2)

[0033] 2NO2+4NH3+O2→3N2+6H2O (3).

[0034] As can be seen from the above principle, in the denitrification reaction zone 104, nitric oxide and nitrogen dioxide in the flue gas react with ammonia (and possibly oxygen) to ultimately generate nitrogen and water vapor that are completely harmless to the environment, thereby achieving the effect of environmental protection.

[0035] The key to this process is ensuring that the flue gas can fully contact the catalyst in the denitrification reaction zone 104 during the denitrification reaction, thereby accelerating the reaction rate and improving the reaction efficiency. To achieve this, a rotating mechanism can be considered, using the centerline of the integrated filter-catalyst tube as the rotation axis. Under the action of the rotating mechanism, the integrated filter-catalyst tube will centrifugally rotate. Consequently, the catalyst in the denitrification reaction zone 104 will move centrifugally relative to the centerline of the integrated filter-catalyst tube, rebounding inward after contacting the outer wall 102. This causes the catalyst to continuously undergo radial and rotational motion within the integrated filter-catalyst tube. The accelerated movement of the catalyst will also promote more frequent contact with the flue gas after dust removal, further accelerating the denitrification reaction rate.

[0036] Preferably, a vibrator can be added to the integrated filter-catalyst tube. Under the action of the vibrator, the integrated filter-catalyst tube will be made to vibrate up and down, and the catalyst in the denitrification reaction zone 104 will also vibrate up and down accordingly, thereby accelerating the movement of the catalyst and further speeding up the denitrification reaction.

[0037] As shown above, the flue gas undergoes dust removal through the outer wall 102 of the integrated filter-catalyst tube, and then undergoes a denitrification reaction in the denitrification reaction zone 104 between the outer wall 102 and the inner wall 103. This process achieves dust removal and denitrification of the flue gas. As a result, the flue gas can pass through the inner wall 103, which also has a metal wire mesh structure, and then leave through the opening of the integrated filter-catalyst tube, thus ultimately achieving denitrification and dust removal of the flue gas.

[0038] Figure 3 A top view of the integrated denitrification and dust removal device according to an embodiment of the present invention is shown. The top view presents a concentric circular structure, with the outer circle being the outer wall 102, the inner circle being the inner wall 103, the portion between the inner and outer circles being the denitrification reaction zone 104, and the portion inside the inner circle being the opening of the integrated filter-catalyst tube. From the top view, the flue gas undergoes dust removal through the outer wall 102 of the outer circle, and then undergoes a denitrification reaction through the denitrification reaction zone 104 between the inner and outer circles. After completing dust removal and denitrification, the flue gas passes through the inner wall 103 of the inner circle and enters the opening inside the inner circle, thereby exiting the integrated denitrification and dust removal device of the present invention.

[0039] In summary, the integrated denitrification and dust removal device provided by this invention is unique in the field, as it achieves both denitrification and dust removal functions efficiently using only a single integrated filter and catalytic tube structure.

[0040] In this invention, the outer wall of the integrated filter-catalyst tube, through a metal mesh structure, performs dust removal. Simultaneously, the outer and inner walls of the integrated filter-catalyst tube define a denitrification reaction zone to support the denitrification catalyst, where the denitrification reaction takes place. Therefore, the outer wall of the integrated filter-catalyst tube serves a dual function: both dust removal and defining the denitrification reaction zone. Similarly, the inner wall of the integrated filter-catalyst tube also serves a dual function: defining the denitrification reaction zone and acting as an outlet channel after the denitrification reaction. Unlike existing technologies that require dedicated dust removal, denitrification, and emission zones in integrated denitrification and dust removal equipment, this invention achieves all these functions using a single integrated filter-catalyst tube. This ingenious high integration allows for centrifugal and vibrational movements of the integrated filter-catalyst tube structure, thereby maximizing the catalytic effect of the denitrification catalyst.

[0041] Furthermore, because the integrated denitrification and dust removal device of the present invention adopts an extremely simple integrated filter-catalyst tube structure, multiple such integrated filter-catalyst tubes can be placed side by side or in an orderly manner to form an integrated filter-catalyst tube array, thereby achieving multi-threaded synchronous dust removal and denitrification, and further increasing the efficiency of dust removal and denitrification.

[0042] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0043] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A denitration and dust removal integrated device, characterized in that, The denitration and dust removal integrated device is in the form of a filter-catalyst integrated pipe, which comprises an outer wall, an inner wall and a denitration reaction zone between the outer wall and the inner wall, The outer wall is in the form of a wire mesh structure, and flue gas passes through the outer wall under the blowing of a fan, thereby blocking the passage of dust in the flue gas; The denitration reaction zone stores a denitration catalyst, and the flue gas passing through the outer wall contacts the denitration catalyst in the denitration reaction zone and performs a denitration reaction; The inner wall is in the form of a wire mesh structure, and the flue gas after the denitration reaction exits from the opening of the filter-catalyst integrated pipe, The denitration and dust removal integrated device further comprises a rotating mechanism, with the center line of the filter-catalyst integrated pipe as the rotating shaft, so that the filter-catalyst integrated pipe performs centrifugal rotation under the action of the rotating mechanism, and the denitration catalyst in the denitration reaction zone performs centrifugal motion relative to the center line of the filter-catalyst integrated pipe, bounces back inward after touching the outer wall, thereby causing the catalyst to continuously perform radial motion and rotational motion in the filter-catalyst integrated pipe.

2. The device according to claim 1, wherein The denitration reaction is based on the following principles: 4NO + 4NH3 + O2→ 4N2 + 6H2O (1) NO + NO2 + 2NH3→ 2N2 + 3H2O (2) 2NO2 + 4NH3 + O2→ 3N2 + 6H2O (3).

3. The device according to claim 1, wherein The wire mesh structure of the outer wall is provided with micropores and forms a micropore array for blocking the passage of dust in the flue gas.

4. The device according to claim 3, wherein The fan blows the flue gas by spiral blowing, so that the flue gas assumes a spiral flow form before passing through the outer wall, and the micropore array in the wire mesh structure of the outer wall is also arranged in a corresponding spiral form, so that the flue gas in the spiral upward form enters the spiral micropore array in turn, thereby accelerating the passage of the flue gas through the outer wall.

5. The device according to claim 1, wherein The denitration catalyst is nanoscale rutile TiO2, V2O5 or a mixture of TiO2 and V2O5.

6. The device according to claim 1, wherein A shaker is installed near the filter-catalyst integrated pipe, and under the action of the shaker, the filter-catalyst integrated pipe assumes an up-and-down vibration state, and the denitration catalyst in the denitration reaction zone also vibrates up and down accordingly.

7. An array of denitration and dust removal integrated devices, characterized in that, A plurality of denitration and dust removal integrated devices according to claim 1 in the form of filter-catalyst integrated pipes are arranged in an array form in rows or columns, thereby constituting the denitration and dust removal integrated device array, and realizing multi-thread synchronous dust removal and denitration.

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