Ash blowing device and catalytic reduction denitration equipment using same

Abstract

The utility model discloses a kind of injection blowing ash removal device and catalytic reduction denitration equipment using it, comprising: for providing high-pressure gas source injection blowing component and for releasing high-speed mixed gas flow rotating jet component;Wherein rotating jet component includes injection blowing main pipe, at least one injection blowing branch pipe connected with injection blowing main pipe, multiple jet nozzles arranged on each injection blowing branch pipe, and driving unit for driving injection blowing main pipe rotation;Each jet nozzle includes sequentially communicating suction pipe, throat pipe and diffusion pipe;Suction pipe includes outer pipe body connected with throat pipe and inner pipe body arranged in outer pipe body interior;Inner pipe body and outer pipe body are fixedly connected at one end away from throat pipe, and inner pipe body has air inlet suitable for compressed air flow cylinder connected with injection blowing branch pipe and exhaust port communicated with the inner chamber of outer pipe body;And at least one smoke suction port communicated with the inner chamber of outer pipe body is further arranged on the lateral wall of outer pipe body;Diffusion pipe is designed with injection hole at the end head away from suction pipe.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection equipment technology, and in particular to a jet cleaning device and a catalytic reduction denitrification device using the same. Background Technology

[0002] SCR (Selective Catalytic Reduction) denitrification technology is widely used in flue gas treatment systems of industrial kilns in coal-fired power plants, steel mills, and cement plants. The denitrification catalysts used can be classified into plate catalysts, honeycomb catalysts, and corrugated plate catalysts according to their structural form. While different catalyst structures have slightly different flow characteristics, resistance to poisoning, mechanical strength, cost, and lifespan, they all face the same problem: ash blockage after a period of use. Ash from the flue gas adheres to the catalyst surface and pores, preventing further contact between the catalyst and ammonia, reducing the catalytic reaction rate. Simultaneously, catalyst blockage increases system resistance, leading to increased system power consumption and operating costs.

[0003] Currently, the mainstream catalyst cleaning methods can be divided into two main categories: online cleaning (without interrupting the operation of the denitrification system) and offline cleaning (requiring shutdown or removal of the catalyst module). Offline cleaning mainly uses high-pressure water washing and mechanical vibration cleaning, and is usually carried out during system shutdown and maintenance. Online cleaning includes conventional compressed air pulse cleaning (high-frequency purging) and steam purging. Compressed air pulse cleaning (high-frequency purging) has high cleaning efficiency and is suitable for conditions where the flue gas contains loose, dry ash and there is no sticky ash accumulation in the channels, but it is ineffective for sticky ash accumulation, as the pulse airflow cannot blow it away. Steam purging has moderate cleaning efficiency. If the steam condenses (e.g., the flue gas temperature is below 100℃), it will increase the moisture content of the ash, causing the ash to clump together in the channels (forming cement-like ash accumulation), which will aggravate the blockage. Moreover, a small amount of moisture may remain in the channels after steam purging, requiring an extended interval between two purgings; otherwise, it will easily aggravate ash adhesion.

[0004] Therefore, given the problems of incomplete cleaning, high energy consumption, and poor adaptability to sticky ash accumulation in the currently used dust removal methods, it is necessary to further optimize the dust removal methods. Utility Model Content

[0005] The primary objective of this invention is to provide a jet-blowing dust removal device to address the technical problem of optimizing its dust removal effect.

[0006] The second objective of this invention is to provide a catalytic reduction denitrification device to solve the technical problem of optimizing its dust removal effect.

[0007] The jet-blowing dust removal device of this utility model achieves this as follows: A pulse-jet cleaning device includes: a pulse-jet assembly for providing a high-pressure air source and a rotating jet assembly for releasing a high-speed mixed airflow; wherein... The rotating jet assembly includes a main jet pipe, at least one jet branch pipe connected to the main jet pipe, a plurality of jet nozzles disposed on each jet branch pipe, and a drive unit for driving the main jet pipe to rotate. Each jet nozzle includes an intake pipe, a throat pipe, and a diffuser pipe connected in sequence; the intake pipe includes an outer pipe body connected to the throat pipe and an inner pipe body located inside the outer pipe body; the inner pipe body and the outer pipe body are fixedly connected at one end away from the throat pipe, and the inner pipe body has an air inlet suitable for compressed air flow tube connected to the jet branch pipe and an exhaust port communicating with the inner cavity of the outer pipe body; and at least one smoke inlet communicating with the inner cavity of the outer pipe body is also provided on the side wall of the outer pipe body; the diffuser pipe is designed with a jet hole at the end away from the intake pipe.

[0008] In an optional embodiment of this invention, the inner diameter of the throat is much smaller than the inner diameters of the outer tube and the diffuser; and The outer tube body includes a columnar tube connected to the jet branch pipe and a conical tube connected to the throat pipe. The inner tube is a tapered tube whose inner diameter gradually decreases from the jetting branch pipe toward the throat pipe.

[0009] In an optional embodiment of this invention, the drive unit includes a rotating shaft connected to the main jet pipe and a speed reducer for driving the rotating shaft to rotate.

[0010] In an optional embodiment of this utility model, the rotating jet assembly further includes an air inlet sleeve fitted over the outer layer of the end of the jet main tube connected to the rotating shaft; The side wall of the jetting main pipe is provided with at least one vent that communicates with the inner cavity of the air inlet sleeve, and the side wall of the air inlet sleeve is provided with at least one air inlet that connects to a high-pressure air source.

[0011] In an optional embodiment of this invention, both the rotating shaft and the main jet pipe are rotatably coupled to the air inlet sleeve; and The rotating shaft and the main jet pipe are respectively equipped with sealing caps between them and the air inlet sleeve.

[0012] In an optional embodiment of this utility model, the blowing assembly includes an air reservoir and an electromagnetic pulse valve; the air reservoir is connected to the air inlet via the electromagnetic pulse valve.

[0013] In an optional embodiment of this invention, each of the jetting branch pipes is vertically connected to the jetting main pipe; and The branch pipes of the jetting system are also equipped with inclined cables to the main jetting system.

[0014] The catalytic reduction denitrification equipment of this invention achieves the following: A catalytic reduction denitrification device includes at least: a device body, and at least one of the aforementioned pulse-jet cleaning devices disposed within the device body.

[0015] In an optional embodiment of this utility model, the equipment body includes a housing, an inlet flue and an outlet flue connected to the housing, and an airflow distribution plate, a rectifier grid, and at least one layer of denitrification catalyst disposed within the housing; Each layer of the denitrification catalyst is equipped with a jet cleaning device.

[0016] In an optional embodiment of this invention, the device body includes at least two layers of denitrification catalyst spaced apart; and At least two jet cleaning devices are connected in their jet pipes so that at least two jet cleaning devices share a single drive unit.

[0017] By adopting the above technical solution, this utility model has the following beneficial effects: The jet cleaning device and the catalytic reduction denitrification equipment using it have an online cleaning function, requiring no shutdown and not affecting production. Compressed air is periodically jetted by the jet assembly, and a high-speed mixed airflow is released through the rotating jet assembly, efficiently and thoroughly cleaning the ash accumulated on the surface and internal pores of the denitrification catalyst, which is then carried away by the flue gas. Simultaneously, the rotating jet assembly is driven by a drive unit to rotate slowly, cleaning the catalyst surface and internal pores 360 degrees without dead angles, ensuring thorough cleaning, reliable structure, and preventing blockage of the denitrification catalyst due to fly ash deposits, maintaining denitrification efficiency, and extending the service life of the denitrification catalyst. Compressed air is released through the jet nozzle; only a small amount of high-pressure air source is needed to draw in a large amount of flue gas, forming a powerful jet mixed airflow, which still has good removal efficiency for sticky ash, achieving high efficiency and energy saving. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the catalytic reduction denitrification equipment of this utility model. Figure 2 This is a schematic diagram of the structure of the jet cleaning device of this utility model; Figure 3 This is a schematic diagram of the jet nozzle of the jet cleaning device of this utility model; Figure 4 This is a schematic diagram of the structure of the jet cleaning component of the jet cleaning device of this utility model; Figure 5 This is a schematic diagram showing the combination of the denitrification catalyst and the main body of the catalytic reduction denitrification equipment of this utility model.

[0019] In the diagram: Equipment body 1, Inlet flue 1.1, Airflow distribution plate 1.2, Rectifying grille 1.3, Shell 1.4, Denitrification catalyst 1.5, Outlet flue 1.6, Pulse cleaning device 2, Electromagnetic pulse valve 2.1.1, Air manifold 2.1.2, Outlet pipeline 2.1.3, Inlet pipeline 2.1.4, Adjusting ring 2.1.5, Reducer 2.2.1, Inlet sleeve 2.2.4, Inlet port 2.2.5, Rotating shaft 2.2.6, Flange 2.2.7, Pulse cleaning main pipe 2.2.9, Cable 2.2.10, Pulse cleaning branch pipe 2.2.11, Jet nozzle 2.2.12, Outer pipe 2.2.12.1, Inner pipe 2.2.12.2, Throat 2.2.12.3, Diffuser 2.2.12.4, Smoke port 2.2.12.5. Detailed Implementation

[0020] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0021] Example 1: Please refer to Figures 1 to 4 As shown, this embodiment provides a jet cleaning device, including: a jet assembly for providing a high-pressure air source and a rotating jet assembly for releasing a high-speed mixed airflow; wherein the rotating jet assembly includes a main jet pipe 2.2.9, at least one jet branch pipe 2.2.11 connected to the main jet pipe 2.2.9, a plurality of jet nozzles 2.2.12 disposed on each jet branch pipe 2.2.11, and a drive unit for driving the main jet pipe 2.2.9 to rotate. To improve the reliability and stability of the rotating jet assembly during use, each jet branch pipe 2.2.11 is vertically connected to the main jet pipe 2.2.9; and each jet branch pipe 2.2.11 is also provided with an obliquely arranged cable 2.2.10 connected to the main jet pipe 2.2.9.

[0022] Specifically, each jet nozzle 2.2.12 includes an intake pipe, a throat pipe 2.2.12.3, and a diffuser pipe 2.2.12.4 connected in sequence; the intake pipe includes an outer tube body 2.2.12.1 connected to the throat pipe 2.2.12.3 and an inner tube body 2.2.12.2 disposed inside the outer tube body 2.2.12.1; the inner tube body 2.2.12.2 and the outer tube body 2.2.12.1 are located away from the throat pipe 2.2.12.3. One end is fixed, and the inner tube 2.2.12.2 has an air inlet suitable for compressed air flow tube connected to the blow-off branch pipe 2.2.11 and an exhaust port communicating with the inner cavity of the outer tube 2.2.12.1; and the side wall of the outer tube 2.2.12.1 is also provided with at least one smoke inlet 2.2.12.5 communicating with the inner cavity of the outer tube 2.2.12.1; the diffuser 2.2.12.4 is designed with a blow-off hole at the end away from the intake pipe.

[0023] More specifically, based on the above structure, the inner diameter of the throat 2.2.12.3 is much smaller than the inner diameters of the outer tube 2.2.12.1 and the diffuser 2.2.12.4; and the outer tube 2.2.12.1 includes a cylindrical tube connected to the jet branch pipe 2.2.11 and a conical tube connected to the throat 2.2.12.3; the inner tube 2.2.12.2 is a conical tube whose inner diameter gradually decreases from the jet branch pipe 2.2.11 towards the throat 2.2.12.3. Based on this structure, when the high-pressure airflow passes through the jet nozzle 2.2.12, a vacuum negative pressure is generated at the throat 2.2.12.3, which entrains a large amount of surrounding smoke through the smoke inlet 2.2.12.5. The compressed air and smoke mix at the rear of the throat 2.2.12.3, and after being decelerated and pressurized by the diffuser 2.2.12.4, a strong mixed jet stream is formed.

[0024] Referring to the accompanying drawings, in one embodiment, the drive unit used includes a rotating shaft 2.2.6 connected to the main spray pipe 2.2.9, and a reducer 2.2.1 for driving the rotating shaft 2.2.6 to rotate.

[0025] Furthermore, it should be noted that the rotating jet assembly also includes an air inlet sleeve 2.2.4 fitted over the outer layer of the end of the jet pipe 2.2.9 connected to the rotating shaft 2.2.6; the side wall of the jet pipe 2.2.9 is provided with at least one vent communicating with the inner cavity of the air inlet sleeve 2.2.4, and the side wall of the air inlet sleeve 2.2.4 is provided with at least one air inlet port 2.2.5 for connecting to a high-pressure air source. Both the rotating shaft 2.2.6 and the jet pipe 2.2.9 are rotatably fitted with the air inlet sleeve 2.2.4; and sealing caps (2.2.3 and 2.2.8) are respectively disposed between the rotating shaft 2.2.6 and the jet pipe 2.2.9 and the air inlet sleeve 2.2.4. The jet pipe 2.2.9 is connected to the rotating shaft 2.2.6 via a flange 2.2.7. The jetting assembly includes an air reservoir 2.1.2 and an electromagnetic pulse valve 2.1.1; the air reservoir 2.1.2 is connected to the air inlet 2.2.5 via the electromagnetic pulse valve 2.1.1. The air reservoir 2.1.2 is connected to an air inlet pipe 2.1.4 and an air outlet pipe 2.1.3, with the air outlet pipe 2.1.3 connected to the air inlet 2.2.5 of the air inlet sleeve 2.2.4 via an adjusting ring 2.1.5.

[0026] In summary, for the jet cleaning device 2 in this embodiment, the jet cleaning component periodically jets high-pressure air from the electromagnetic pulse valve 2.1.1, which is then released through the jet nozzle 2.2.12. As the nozzle diameter decreases, the compressed air is ejected from the nozzle at extremely high speed. The high-speed compressed air passes through the intake chamber and enters the throat 2.2.12.3, creating a partial vacuum in the throat 2.2.12.3. A large amount of flue gas introduced (or forced in) through the smoke inlet 2.2.12.5 enters the throat 2.2.12.3, forming a mixture under the action of the high-speed airflow. This mixture is then discharged outward through the diffuser 2.2.12.4, where its speed decreases and its pressure increases, forming a powerful jet stream that powerfully cleans the ash deposited on the surface and pores of the denitrification catalyst 1.5, achieving high efficiency and energy saving. The pulse-jet cleaning device 2 is always in a rotating state, which does not increase the tendency of dust accumulation. The amount of air introduced during cleaning is very small and will not affect the distribution of flue gas flow field.

[0027] Example 2: Please refer to Figures 1 to 5 As shown, based on the pulse-jet cleaning device 2 of Example 1, this embodiment provides a catalytic reduction denitrification device, which includes at least: a device body 1, and a pulse-jet cleaning device 2 as in Example 1 disposed in the device body 1.

[0028] The main body 1 includes a shell 1.4, an inlet flue 1.1 and an outlet flue 1.6 connected to the shell 1.4, and an airflow distribution plate 1.2, a flow straightening grid 1.3, and at least one layer of denitrification catalyst 1.5 disposed within the shell 1.4; each layer of denitrification catalyst 1.5 is equipped with a jet cleaning device 2 above it. Flue gas flows in through the inlet flue 1.1, passes sequentially through the airflow distribution plate 1.2, the flow straightening grid 1.3, and the two layers of denitrification catalyst 1.5, and then flows out through the outlet flue 1.6. The airflow distribution plate and flow straightening grid 1.3 are installed here to optimize the flue gas flow field, evenly distribute the flow velocity, avoid local high-speed zones scouring the denitrification catalyst 1.5, promote ammonia mixing, reduce ammonia escape, lower system resistance, and improve reaction efficiency.

[0029] Optionally, the denitrification catalyst 1.5 has a fan-shaped structure, which offers greater space utilization compared to the traditional rectangular structure, with a cross-sectional area exceeding 95%, effectively promoting the selective catalytic reduction (SCR) reaction of NH3 and NOx (4NO + 4NH3 + O2 → 4N2 + 6H2O). As the flue gas flows within the denitrification equipment, the slower flow velocity allows dust carried in the gas to gradually adhere to the surface and internal pores of the denitrification catalyst 1.5, reducing catalytic efficiency and increasing system resistance.

[0030] A jet cleaning device 2 is installed on the upper side of the denitrification catalyst 1.5. Compressed air is periodically jetted through the jet assembly, and high-speed mixed airflow is released through the rotating jet assembly to efficiently and thoroughly clean the dust accumulated on the surface and inside the pores of the denitrification catalyst 1.5, which is then carried away by the flue gas.

[0031] Based on the above structure, the equipment body 1 further includes at least two layers of denitrification catalyst arranged at intervals; and is connected to the jet pipe of at least two jet cleaning devices so that at least two jet cleaning devices share a drive unit.

[0032] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0033] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0037] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. A pulse-jet cleaning device, characterized in that, include: A jet assembly for providing a high-pressure gas source and a rotating jet assembly for releasing a high-speed mixed gas flow; in The rotating jet assembly includes a main jet pipe, at least one jet branch pipe connected to the main jet pipe, a plurality of jet nozzles disposed on each jet branch pipe, and a drive unit for driving the main jet pipe to rotate. Each jet nozzle includes an intake pipe, a throat pipe, and a diffuser pipe connected in sequence; the intake pipe includes an outer pipe body connected to the throat pipe and an inner pipe body located inside the outer pipe body; the inner pipe body and the outer pipe body are fixedly connected at one end away from the throat pipe, and the inner pipe body has an air inlet suitable for compressed air flow tube connected to the jet branch pipe and an exhaust port communicating with the inner cavity of the outer pipe body; and at least one smoke inlet communicating with the inner cavity of the outer pipe body is also provided on the side wall of the outer pipe body; the diffuser pipe is designed with a jet hole at the end away from the intake pipe.

2. The pulse-jet cleaning device according to claim 1, characterized in that, The inner diameter of the throat is much smaller than the inner diameters of the outer tube and the diffuser; and The outer tube body includes a columnar tube connected to the jet branch pipe and a conical tube connected to the throat pipe. The inner tube is a tapered tube whose inner diameter gradually decreases from the jetting branch pipe toward the throat pipe.

3. The jet-blowing dust removal device according to claim 1 or 2, characterized in that, The drive unit includes a rotating shaft connected to the main jet pipe and a speed reducer for driving the rotating shaft to rotate.

4. The jet-blowing cleaning device according to claim 3, characterized in that, The rotating jet assembly also includes an air inlet sleeve fitted over the outer layer of the end of the jet main tube connected to the rotating shaft; The side wall of the jetting main pipe is provided with at least one vent that communicates with the inner cavity of the air inlet sleeve, and the side wall of the air inlet sleeve is provided with at least one air inlet that connects to a high-pressure air source.

5. The pulse-jet cleaning device according to claim 4, characterized in that, Both the rotating shaft and the main jet pipe are rotatably fitted with the air inlet sleeve; and The rotating shaft and the main jet pipe are respectively equipped with sealing caps between them and the air inlet sleeve.

6. The pulse-jet cleaning device according to claim 4, characterized in that, The jetting assembly includes an air reservoir and an electromagnetic pulse valve; the air reservoir is connected to the air inlet via the electromagnetic pulse valve.

7. The pulse-jet cleaning device according to claim 1, characterized in that, Each of the aforementioned jetting branch pipes is vertically connected to the jetting main pipe; and The branch pipes of the jetting system are also equipped with inclined cables to the main jetting system.

8. A catalytic reduction denitrification device, characterized in that, At least including: The equipment body, and at least one jet cleaning device as described in any one of claims 1 to 7 disposed within the equipment body.

9. The catalytic reduction denitrification equipment according to claim 8, characterized in that, The equipment body includes a housing, an inlet flue and an outlet flue connected to the housing, and an airflow distribution plate, a rectifier grid and at least one layer of denitrification catalyst disposed within the housing; Each layer of the denitrification catalyst is equipped with a jet cleaning device.

10. The catalytic reduction denitrification equipment according to claim 9, characterized in that, The device body includes at least two layers of denitrification catalyst spaced apart; and At least two jet cleaning devices are connected in their jet pipes so that at least two jet cleaning devices share a single drive unit.

Images