Boiler waste heat flue gas treatment device and treatment method

Abstract

The invention relates to the technical field of boiler hot gas treatment equipment, in particular to a boiler waste heat flue gas treatment device and method.The boiler waste heat flue gas treatment device comprises a discharge electrode and a dust collection electrode which are driven to move, the dust collection electrode is divided into a meeting frame and a collection frame opposite to the meeting frame and movably arranged according to the structure, and the discharge electrode is located on the outer side of the meeting frame; an air chamber is arranged between the meeting frame and the collecting frame, and the end part of the collecting frame is provided with an air passage which is communicated with the air chamber and is positioned on the same vertical plane with the discharge electrode. According to the boiler waste heat flue gas treatment device and method, a large amount of charged dust enters the gas chamber from the gas channel and is attached to the inner wall of the arc cover; and after one row of collecting frames horizontally move towards the meeting frame, the air chambers on the dust collecting electrodes are subjected to sealing treatment, so that a stable windproof space is obtained, electrified dust falling is not interfered by airflow, and the purpose of shaking off dust under normal operation of equipment is achieved.

Description

Technical Field

[0001] This invention relates to boiler heat gas treatment equipment technology, specifically a boiler waste heat flue gas treatment device and treatment method. Background Technology

[0002] Industrial boilers use fuel combustion to heat the medium and complete the heat conversion. In the process, exhaust gas is inevitably generated, and the exhaust gas generally contains air pollutants such as soot, sulfur dioxide, and carbon monoxide.

[0003] For example, the publication (announcement) number: CN117225155B, publication (announcement) date: 2024-11-05, discloses a flue gas treatment system for a gas turbine waste heat boiler, including a waste heat boiler equipped with a dust removal mechanism.

[0004] The shortcomings of existing technologies lie in the fact that industrial boilers typically use electrostatic precipitators (ESPs) to treat flue gas, employing dry electrostatic precipitator technology. The principle involves using a high-voltage electric field to charge dust particles at the discharge electrode (cathode). Under the influence of the electric field, the dust particles move towards the collecting electrode (anode, a plate-like structure) and are captured. Then, a vibrating device shakes off the dust particles from the collecting electrode, allowing them to fall into the ash hopper for collection. However, to reduce or avoid interference from the dust-laden airflow during the collection process (i.e., the airflow blows the falling dust out of the equipment instead of collecting it), the airflow velocity at the inlet is usually reduced or the inlet is closed. This results in two states: online and offline cleaning. Online cleaning requires the dust settling velocity to exceed the airflow carrying capacity; offline cleaning allows the dust to fall directly into the ash hopper. While both methods achieve efficient dust collection, they both involve slowing down the dust collection, extending the flue gas treatment cycle and reducing overall efficiency. Some electrostatic precipitators also use compartmentalized offline cleaning, equipping one or more dust collection electrodes with compartments and closing the compartments before shaking off the dust, thus achieving efficient and safe dust collection. However, when each dust collection electrode is equipped with a compartment, the total wall thickness of the compartments becomes too large, reducing the internal space of the equipment. At the same time, a corresponding number of control switches and wiring are required, increasing the maintenance and operating costs of the equipment. When multiple dust collection electrodes are equipped with a compartment, once a compartment is closed, the internal space of the equipment is also reduced. Under the same air intake, the remaining compartments need to work under high load, increasing the amount of dust escaping and greatly reducing the dust capture efficiency. Alternatively, if the remaining compartments are to maintain normal operation, the airflow velocity at the air intake needs to be reduced, and the resulting treatment efficiency is still unsatisfactory. Summary of the Invention

[0005] The purpose of this invention is to provide a boiler waste heat flue gas treatment device and method to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A boiler waste heat flue gas treatment device includes a dust collector shell with an ash hopper, and a driven discharge electrode and a dust collection electrode. The dust collection electrode is structurally divided into an attack frame and a collection frame that is movably arranged opposite to the attack frame, wherein: The discharge electrode is located on the outside of the attack frame; An air chamber is provided between the interceptor and the collection frame, and an air channel is provided at the end of the collection frame that communicates with the air chamber and is in the same vertical plane as the discharge electrode. The collection rack has multiple air holes for discharging airflow from the air chamber, and when the collection rack is moved, the air holes and air passages are closed.

[0007] As a further description of the above technical solution: the end of the interceptor is symmetrically fixedly equipped with a rigid arc strip in the air chamber, and the pointed cone on the collection frame is always in contact with the rigid arc strip.

[0008] As a further description of the above technical solution: the collection rack is fixedly installed with symmetrically arranged arc edges that cover the outside of the airway.

[0009] As a further description of the above technical solution: the end of the arc edge is provided with a tip, which pushes the anti-attack frame to slide a predetermined distance before the two separate, and the tip returns to the starting and ending positions of the sliding distance.

[0010] As a further description of the above technical solution: the interceptor frame is provided with a plug plate that is inserted into the collection frame, and the end of the plug plate is fitted with an elastic element.

[0011] As a further description of the above technical solution: it also includes a rotating shaft with a toggle block fixedly installed on its side wall. When the shaft is driven to rotate circumferentially, the toggle block periodically moves the contact rod fixedly installed on the intercepting frame.

[0012] As a further description of the above technical solution: a pusher is rotatably provided on the pusher block, and the circumferential rotation stroke of the rotating shaft includes a forward rotation stroke, and the pusher block is synchronized with the contact plate provided on the collection rack during this stroke.

[0013] As a further description of the above technical solution: the circumferential rotation stroke of the rotating shaft includes a reverse stroke, and during this stroke, the toggle block and the contact plate move synchronously to make the diameter of the air hole adjustable.

[0014] As a further description of the above technical solution: it also includes multiple limiting frames disposed in the dust collector housing, and the dust collecting pole is slidably engaged with the limiting frames.

[0015] A method for treating boiler waste heat flue gas, comprising the boiler waste heat flue gas treatment device described in any one of the above claims, further comprising the following steps: S1. The flue gas discharged from the waste heat boiler is cooled by a heat exchanger to obtain flue gas with a temperature of 100℃-180℃. S2. Adjust the resistivity of the dust by spraying chemical agents onto the dust, and then dry the dust. S3. The cooled and conditioned flue gas is transported into the dust collector shell through a pipeline, so that the dust-laden airflow flows through multiple discharge electrodes and dust collection electrodes respectively; S4. Connect the 30kV-100kV high voltage DC power supply to ionize the air around the discharge electrode, forming a corona region and generating a large number of electrons and a small number of positive ions. When dust passes through the corona region, it collides with electrons and ions and becomes negatively charged. A small number of particles become positively charged due to electrostatic induction. S5. Under the action of electric field force, a large number of negatively charged dust particles move towards the dust collecting electrode of the anode, while positively charged dust particles move towards the discharge electrode. Since the surface area of ​​the dust collecting electrode is much larger than that of the discharge electrode, most of the dust particles are adsorbed on the inner wall of the gas chamber. S6. The adsorbed dust is shaken off by the shaking of the discharge electrode and the dust collection electrode and falls into the ash hopper at the bottom of the dust collector shell. S7. The treated airflow is discharged from the dust collector casing.

[0016] In the above technical solution, the boiler waste heat flue gas treatment device and treatment method provided by the present invention have the following beneficial effects: a large amount of charged dust enters the gas chamber from the gas duct and adheres to the inner wall of the arc shroud; as one row of collecting racks moves horizontally towards the anti-attack rack, the gas chamber on the dust collecting pole is sealed to obtain a stable windproof space, so that the charged dust falls without being disturbed by the airflow, and during the dust shaking process, the airflow flows from the adjacent dust collecting poles of the current row to the rear and is adhered to the next row of dust collecting poles, so that the dust collector shell can normally pass dust inward during the dust shaking process, without the need for the air inlet to slow down or close, and without the need to set up a partition chamber to make the dust shaking in a windless environment, which satisfies the requirements of efficient dust collection and ensures the dust removal efficiency of the equipment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of an electrostatic dust removal device provided in an embodiment of the present invention; Figure 2 This is a cross-sectional view of the electrostatic dust removal equipment and a schematic diagram of the assembly of multiple discharge electrodes and dust collection electrodes provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the assembly of the discharge electrode and the dust collection electrode between two limiting frames provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of a partial limiting frame provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the explosion of the discharge electrode and the dust collection electrode provided in an embodiment of the present invention; Figure 6 A schematic diagram of the interceptor provided in an embodiment of the present invention; Figure 7 A schematic diagram of a collection rack provided in an embodiment of the present invention; Figure 8 This is a top view diagram of the assembly of the interceptor and collection frame provided in an embodiment of the present invention; Figure 9 This is a top-down view of the assembled interceptor and collection rack provided in an embodiment of the present invention. Figure 10 A schematic diagram of an elastic element provided in an embodiment of the present invention; Figure 11 This is a schematic diagram of the assembly of parts on the deflector, the interceptor, and the collection rack provided in an embodiment of the present invention; Figure 12 This is a schematic diagram illustrating the changes in the assembly movements of the toggle block, the interceptor, and the collecting rack, as provided in an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures: 1. Dust collector housing; 11. Dust hopper; 2. Limiting frame; 21. Discharge port; 22. Round hole; 23. Slide rail; 3. Rotating shaft; 31. Pushing block; 32. Pushing block; 4. Electrical frame; 41. Discharge electrode; 5. Dust collecting electrode; 51. Rib; 52. Receiving frame; 53. Hard arc strip; 54. First connecting frame; 55. Insert plate; 56. Elastic element; 561. Spring; 57. Contact rod; 6. Collection frame; 60. Air hole; 61. Arc cover; 62. Arc edge; 63. Tip; 64. Second connecting frame; 65. Socket; 66. Contact plate; 67. Plate hole; 7. Air chamber; 71. Air passage. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] Example 1 Please see Figure 1-12 The present invention provides a technical solution: a boiler waste heat flue gas treatment device, including a dust collector shell 1 with an ash hopper 11, and a driven discharge electrode 41 and a dust collection electrode 5. The dust collection pole 5 is structurally divided into an interceptor frame 52 and a collection frame 6 that is opposite to and movable from the interceptor frame 52, wherein: The discharge electrode 41 is located outside the attack frame 52; An air chamber 7 is provided between the interceptor frame 52 and the collection frame 6. An air passage 71 is provided at the end of the collection frame 6, which is connected to the air chamber 7 and is located on the same vertical plane as the discharge electrode 41. The collection rack 6 has multiple air holes 60 for discharging airflow from the air chamber 7, and when the collection rack 6 is moved, the air holes 60 and the air passage 71 are closed.

[0022] Specifically, multiple electrical racks 4 are detachably installed on the top inner wall of the dust collector housing 1. The lower end of the electrical rack 4 is forked (covered with a rubber insulating layer to reduce the interference of the electrical rack 4 with the dust), so that a single electrical rack 4 can install two discharge electrodes 41, and multiple barbs are integrally formed on the side wall of the discharge electrode 41.

[0023] Furthermore, the interceptor 52 consists of a vertical rib 51 and two symmetrically arranged arc-shaped metal plates. The metal plates can bend and deform at the rib 51, so that the two metal plates can move away from each other or move closer to each other. Each metal plate corresponds to a discharge electrode 41, which can ensure the metal plate's ability to adsorb dust.

[0024] Furthermore, the collection rack 6 is equipped with symmetrically arranged arc-shaped shields 61 (made of elastic metal sheets bent into an arc shape), and the inner wall of the arc-shaped shields 61 is in the direction of airflow impact. The distance between the port of the arc-shaped shields 61 and the metal sheet is the inner diameter of the air passage 71. The air hole 60 is located at the connection of the two arc-shaped shields 61 (conical in shape, with the cone tip facing the interceptor frame 52), and the air hole 60 is divided into two openings, with one opening assigned to the end of each arc-shaped shield 61. When the collection rack 6 moves horizontally, the conical part gradually closes, and the two openings merge and connect, that is, the air hole 60 overlaps into the air chamber 7, thereby achieving the closure of the air hole 60.

[0025] Furthermore, the lower end of the dust collecting electrode 5 is located inside the ash hopper 11, allowing the dust collected in the air chamber 7 to fall directly into the ash hopper 11. The upper end of the dust collecting electrode 5 is higher than the flow height of the dust-laden airflow, so the interior of the sealed air chamber 7 is not affected by the airflow.

[0026] The dust-laden airflow is divided by the rib 51 and flows across the surfaces of the two metal plates. Both discharge electrodes 41 operate simultaneously. Due to the flowing dust, a small amount of charged dust adheres to the ends of the metal plates (the end closest to the air chamber 7), while a large amount of charged dust enters the air chamber 7 from the air passage 71 and adheres to the inner wall of the arc shield 61. (The total amount of dust adhering to the discharge electrodes 41 in small, large, and very small quantities is equal to the total amount of charged dust processed during that time period, in g / m³.) 3As one row of collecting racks 6 moves horizontally toward the interceptor rack 52, the sealed air chamber 7 provides a stable windproof space, and the falling charged dust is not disturbed by the airflow. During the dust shaking process, the airflow flows from the adjacent dust collecting electrodes 5 of the current row to the rear and is attached and treated by the next row of dust collecting electrodes 5. This allows the dust collector shell 1 to normally allow dust to enter during the dust shaking process without the need for the air inlet to slow down or close. At the same time, there is no need to set up a partition chamber to keep the dust shaking in a windless environment. This satisfies the requirements of efficient dust collection and ensures the dust removal efficiency of the equipment.

[0027] In another embodiment of the present invention, the end of the interceptor 52 is symmetrically fixedly installed with a rigid arc strip 53 located in the air chamber 7, and the pointed cone on the collection rack 6 is always in contact with the rigid arc strip 53.

[0028] Specifically, the hard arc strip 53 is a fixed-shape arc-shaped hard metal strip, and the vertical area formed by the sum of the heights of all the hard arc strips 53 in the dust collection electrode 5 has negligible interference with the dust transport in the air passage 71.

[0029] During the closing process of the ends of the arc cover 61, the other end of the arc cover 61 is pulled closer to the air chamber 7. At the same time, the ends of the rigid arc strips 53 passively slide on the pointed cone, and the inclined surface of the pointed cone pushes the two rigid arc strips 53 away, causing the ends of the metal sheets to open outward (away from the air chamber 7), and applying an outward force to the pulled ends of the arc cover 61 (such as...). Figure 9 As shown by the middle arrow (the long arrow represents the outward force being greater than the inward force of the short arrow), the two opposing forces close the air passage 71, achieving stable formation of the air chamber 7. Furthermore, as the collection rack 6 moves closer to the termination position, the cross-sectional area of ​​the air chamber 7 gradually increases.

[0030] In another embodiment of the present invention, the collection rack 6 is fixedly installed with symmetrically arranged arc edges 62 that cover the outside of the airway 71.

[0031] Specifically, the arc edge 62 is integrally formed at the end of the arc cover 61 that is subject to tension.

[0032] The airflow is guided by the arc edge 62, making it easier for charged dust to enter the air passage 71 along the arc-shaped inner sidewall of the arc edge 62. The moved arc edge 62 reduces the distance between itself and the metal sheet, thereby reducing interference with the backward airflow. This reduces the load on the airflow of the dust collecting electrode 5 during the dust shaking operation, reduces the possibility of overcapacity in the rear dust collecting electrode 5, and makes the dust treatment more balanced.

[0033] In another embodiment of the present invention, the end of the arc edge 62 is provided with a tip 63. After the tip 63 pushes against the anti-attack frame 52 and slides a predetermined distance, the two separate, and the tip 63 returns to the starting and ending positions of the sliding distance.

[0034] Specifically, the tip 63 is the bend where the arc cover 61 and the arc edge 62 are connected.

[0035] After being sealed by the air passage 71, the tip 63 remains driven to slide on the surface of the metal sheet, thus scraping away the dust adsorbed on the surface of the metal sheet. Similarly, when the tip 63 returns and has not yet detached, it also performs a scraping action, causing the scraped dust to re-attach inside the arc cover 61, and then fall down with the shaking. The dust adhering to the inner wall of the arc edge 62 floats during the shaking process. The floating dust will either overflow from the end of the arc edge 62 and flow to the dust collection electrode 5 for collection, or it will remain floating inside the arc edge 62 in two states: one is attached to the metal sheet and can be scraped away by the tip 63, and the other is still attached to the arc edge 62. Although there is always dust adhering to the arc edge 62, the dust is constantly being replaced, thus preventing excessive dust accumulation and scaling problems. Therefore, manual cleaning is sufficient for subsequent maintenance of the dust removal equipment.

[0036] Similarly, charged dust located in front of the discharge electrode 41 (where the airflow has not reached the discharge electrode 41) adheres to areas that cannot be covered by the scraping action. However, it will re-enter the inner side of the arc edge 62 for processing due to vibration. Therefore, the upper part of the dust collecting electrode 5 is manually cleaned, which will not interfere with the operation of the dust removal equipment or affect the dust shaking and collection. When the arc edge 62 moves to the end position, it impacts the discharge electrode 41 (the current discharge electrode 41 and dust collecting electrode 5 that are performing the shaking work need to be de-energized to avoid interference with the dust shaking. De-energizing is a normal start-up and shutdown function of the dust collector equipment, which is existing technology and will not be elaborated here). The impact force is used to shake off the dust on the discharge electrode 41 and allow the shaken dust to enter the arc edge 62 for processing.

[0037] In another embodiment of the present invention, the interceptor 52 is provided with a plug plate 55 that is inserted into the collection rack 6, and an elastic member 56 is snapped onto the end of the plug plate 55.

[0038] Specifically, the insert plates 55 are evenly distributed and welded to the ribs 51. Multiple sockets 65 are welded to the connected ends of the two arc covers 61. The connection position between the ends of the arc covers 61 and the sockets 65 can be elastically deformed, so that the arc covers 61 have the function of closing.

[0039] Furthermore, the insert plate 55 has a slot, the elastic element 56 has a metal spring piece 561 welded on it, the socket 65 has a cavity that allows the spring piece 561 to fully deform, and the end of the spring piece 561 and the inner wall of the cavity can be detachably connected or welded (the lower end of the socket 65 has a hole for manual operation, which also reduces dust intrusion into the socket 65).

[0040] When the socket 65 slides outside the insert plate 55, the spring piece 561 is compressed and deformed to bulge, so that when the spring piece 561 returns to its original shape, it pushes the collection rack 6 back to its original position, and the collection rack 6 can also move stably horizontally during sliding.

[0041] In another embodiment of the present invention, a rotating shaft 3 with a toggle block 31 fixedly installed on its side wall is also included. When the shaft 31 is driven to rotate circumferentially, the toggle block 31 periodically moves the contact rod 57 fixedly installed on the anti-attack frame 52.

[0042] Specifically, a motor with forward and reverse rotation function is detachably installed in the dust collector housing 1, and the motor output end is connected to the rotating shaft 3 by a coupling. The motor and its power supply method are existing technologies and will not be described in detail here.

[0043] Furthermore, the push block 31 has symmetrically arranged triangular protrusions, and the rounded ends of the protrusions are used for pushing. The rotating shaft 3 rotates in the middle of the dust collection pole 5, which can stably transmit the driving force of the push block 31 to the collection rack 6. The push block 31 is integrally formed and is evenly distributed on the side wall of the rotating shaft 3.

[0044] Furthermore, the metal sheet sidewall is provided with a T-shaped hole for the shaft 3 to pass through for installation, and the vertical part of the T-shaped hole enables the interceptor 52 to have vertical movement capability. The arc cover 61 and the arc edge 62 are provided with horizontally distributed strip holes with notches, and the width of the strip holes is greater than the diameter of the shaft 3.

[0045] Furthermore, the upper and lower ends of the rib 51 are integrally formed with a first connecting frame 54. A vertical guide rod and a spring located on the outside of the guide rod are fixedly installed at the end of the first connecting frame 54. The upper guide rod will collide with the electric frame 4 when it moves vertically.

[0046] The rotating lever 31 moves the contact rod 57 up and down, causing the receiving frame 52 to move vertically and compress the springs at the upper and lower ends respectively. After the lever is released, the springs return to their original deformation, thus resetting the receiving frame 52. During this process, the receiving frame 52 has a shaking function to shake off the dust attached to the two metal plates. At the same time, the guide rod moves upward to impact and shake the discharge electrode 41 to remove the dust on the discharge electrode 41.

[0047] In another embodiment of the present invention, a push block 32 is rotatably disposed on the paddle block 31, and the circumferential rotation stroke of the rotating shaft 3 includes a forward rotation stroke, and the push block 32 is synchronized with the contact plate 66 disposed on the collection rack 6 during the stroke.

[0048] Specifically, the projected area of ​​the pusher block 31 in the air chamber 7 is negligible, meaning that the pusher block 31 has a negligible impact on the dust conveyed, discharged, and shaken off in the air chamber 7. The triangular protrusion has a notch at its end for the pusher block 32 to move, and the notch has a limit for the pusher block 32 to rotate to a predetermined angle (the limit is achieved by rotating the protrusion or step to a predetermined angle and then blocking it; the limiting method is existing technology and will not be described in detail here).

[0049] Furthermore, the contact plate 66 has a plate hole 67 for the push block 32 to be inserted, and the width of the plate hole 67 is greater than the width of the push block 31. Therefore, the contact plate 66 will be fitted on the outside of the triangular protrusion and pulled and translated by the triangular protrusion.

[0050] Rotate the dial 31 clockwise (as shown in the image). Figure 12 As shown, from top to bottom (rotating from A to C), the push block 32 deflects by gravity until it is perpendicular to the center line of the triangular protrusion (the push block 32 reaches its maximum deflection angle in the vertical state), and the arc surface on one side of the push block 32 actively hooks the side wall of the plate hole 67, causing the dial block 31 to continue rotating forward while pulling the contact plate 66 horizontally (as shown). Figure 12 As shown, the air chamber 7 is closed by the collection rack 6 by rotating from D to E from top to bottom.

[0051] In another embodiment of the present invention, the circumferential rotation stroke of the rotating shaft 3 includes a reverse stroke, and the lower paddle block 31 moves synchronously with the contact plate 66 to make the diameter of the air hole 60 adjustable.

[0052] Specifically, such as Figure 12 As shown, A indicates that dial block 31 is in the default state.

[0053] During the reversal process of the lever 31, the triangular protrusion with the notch actively pushes the contact rod 57 downward from top to bottom (the push block 32 is housed in the notch under gravity, and the width of the contact rod 57 is greater than the width of the lever 31, so when the triangular protrusion deflects upward during its return stroke, the push block 32 is also restricted by the contact rod 57), while the triangular protrusion without the notch pushes the contact plate 66 away from the interceptor frame 52 from bottom to top, thereby causing the two openings of the vent 60 to be pushed away from each other, in order to increase the air output of the vent 60. As the toggle block 31 continues to rotate forward, the vent 60 is pushed against and its diameter increases again. At this time, the impact frame 52 uses the upper guide rod to impact the discharge electrode 41. With the increase in air volume, the dust shaken off the discharge electrode 41 is mixed with the dust in the arc cover 61 and transported backward to balance the dust falling from the previous discharge electrode 41. Thus, with the above impact on the discharge electrode 41, all the dust on the discharge electrode 41 can be shaken off, so that the discharge electrode 41 does not need to be equipped with a separate knocking device, thereby controlling equipment and maintenance costs.

[0054] In another embodiment of the present invention, a plurality of limiting frames 2 are disposed in the dust collector housing 1, and the dust collecting pole 5 is slidably engaged with the limiting frames 2.

[0055] Specifically, the limiting frames 2 are arranged symmetrically up and down, and multiple limiting frames 2 are distributed in rows inside the dust collector shell 1; the limiting frames 2 are also provided with discharge ports 21 for dust to fall into the ash hopper 11.

[0056] Furthermore, a second connecting frame 64 is welded to the upper and lower ends of the collection frame 6 (its welding method is the same as that of the socket 65, which does not interfere with the deformation and closing of the arc cover 61), and a guide rod and a spring located on the outside of the guide rod are also fixedly installed at the end of the second connecting frame 64.

[0057] Furthermore, the limiting frame 2 has a circular hole 22 for vertical sliding of the guide rod on the interceptor frame 52, and the circular hole 22 has a separate slide 23 at the opposite position, so that the guide rod on the collection frame 6 can move both vertically and horizontally. The guide rod on the collection frame 6 is also welded with a horizontally arranged spring, the other end of which slides vertically with the limiting frame 2 and is detachably connected, so that the spring can be used as a deformation storage force when the collection frame 6 moves away from the interceptor frame 52.

[0058] The limiting frame 2 provides limiting and guiding for the upper and lower ends of the dust collecting electrode 5, so that when the driving force is in the middle of the dust collecting electrode 5, the two ends of the dust collecting electrode 5 can move stably.

[0059] Working principle: The dust-laden airflow is divided by the rib strip 51 and flows onto the surfaces of two metal plates. The two discharge electrodes 41 work simultaneously. Because the dust is in a flowing state, a small amount of charged dust will adhere to the ends of the metal plates, while a large amount of charged dust will enter the air chamber 7 from the air passage 71 and adhere to the inner wall of the arc cover 61. Then, as the toggle block 31 rotates clockwise, the push block 32 is deflected by gravity until the push block 32 is perpendicular to the center line of the triangular protrusion. The arc surface on one side of the push block 32 actively hooks the side wall of the plate hole 67, causing the toggle block 31 to continue rotating clockwise and pull the contact plate 66 horizontally. At the same time, the toggle block 31... When the contact rod 57 and the contact plate 66 are moved vertically, the dust collecting electrode 5 is shaken during operation. As one row of collecting racks 6 moves horizontally towards the receiving rack 52, the sealed air chamber 7 provides a stable windproof space. The falling charged dust is not disturbed by the airflow. During the dust shaking process, the airflow flows from the adjacent dust collecting electrodes 5 in the current row to the rear and is attached and treated by the next row of dust collecting electrodes 5. This allows the dust collector shell 1 to normally allow dust to enter during the dust shaking process without the need for the air inlet to slow down or close. There is also no need to set up a partition chamber to make the dust shaking in a windless environment.

[0060] Example 2 Based on the above embodiment one, this embodiment aims to provide a method for treating boiler waste heat flue gas, the detailed steps of which are as follows: S1. The flue gas discharged from the waste heat boiler is cooled by a heat exchanger to obtain flue gas with a temperature of 100℃-180℃. S2. Adjust the resistivity of the dust by spraying chemical agents onto the dust, and then dry the dust. S3. The flue gas after cooling and conditioning is transported into the dust collector shell 1 through the pipeline, so that the dust-laden airflow flows through multiple discharge electrodes 41 and dust collection electrodes 5 respectively. S4. Connect the 30kV-100kV high voltage DC power supply to ionize the air around the discharge electrode 41, forming a corona region and generating a large number of electrons and a small number of positive ions. When dust passes through the corona region, it collides with electrons and ions and becomes negatively charged. A small number of particles become positively charged due to electrostatic induction. S5. Under the action of electric field force, a large amount of negatively charged dust moves towards the dust collecting electrode 5 of the anode, while the positively charged dust moves towards the discharge electrode 41. Since the surface area of ​​the dust collecting electrode 5 is much larger than that of the discharge electrode 41, most of the dust is adsorbed on the inner wall of the gas chamber 7. S6. The adsorbed dust is shaken off by the shaking of the discharge electrode 41 and the dust collection electrode 5 and falls into the dust hopper 11 at the bottom of the dust collector shell 1. S7. The treated airflow is discharged from the dust collector housing 1.

[0061] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A boiler flue gas treatment apparatus comprising a dust collector housing (1) provided with a hopper (11), characterized in that, The driven discharging electrode (41) and the dust collecting electrode (5) are further included; The dust collecting electrode (5) is divided into a striking frame (52) and a collecting frame (6) which is opposite to the striking frame (52) and movably arranged according to the structure, wherein: The discharging electrode (41) is outside the striking frame (52); An air chamber (7) is arranged between the striking frame (52) and the collecting frame (6), and the end of the collecting frame (6) is provided with an air duct (71) which is communicated with the air chamber (7) and is in the same vertical plane with the discharging electrode (41); A plurality of air holes (60) for discharging the airflow of the air chamber (7) are formed on the collecting frame (6), and the air holes (60) and the air duct (71) are closed by the movable collecting frame (6).

2. A boiler flue gas treatment apparatus according to claim 1, characterised in that, The end of the striking frame (52) is symmetrically fixedly installed with a hard arc strip (53) which is inside the air chamber (7), and the sharp cone on the collecting frame (6) is always in contact with the hard arc strip (53).

3. A boiler flue gas treatment apparatus according to claim 1, wherein The collecting frame (6) is fixedly installed with arc edges (62) which are symmetrically arranged and cover the outside of the air duct (71).

4. A boiler flue gas treatment apparatus according to claim 3, characterised in that, The end of the arc edge (62) is provided with a sharp end (63), the striking frame (52) and the sharp end (63) are separated after the sharp end (63) pushes the striking frame (52) to slide a predetermined distance, and the sharp end (63) is reset to the start and end position of the sliding distance.

5. A boiler flue gas treatment apparatus according to claim 3, wherein The striking frame (52) is provided with an insertion plate (55) which is inserted with the collecting frame (6), and the end of the insertion plate (55) is clamped with an elastic element (56).

6. A boiler flue gas treatment apparatus according to claim 3, wherein A rotating shaft (3) is further included, the side wall of the rotating shaft (3) is fixedly installed with a pushing block (31), and the pushing block (31) periodically pushes the contact rod (57) fixedly installed on the striking frame (52) when the rotating shaft (3) is driven to rotate circumferentially.

7. A boiler flue gas treatment apparatus according to claim 6, characterised in that, The pushing block (31) is rotatably arranged on the pushing block (31), the circumferential rotation stroke of the rotating shaft (3) includes a forward rotation stroke, and the pushing block (32) is synchronous with the contact plate (66) arranged on the collecting frame (6) when the rotating shaft (3) is in the stroke.

8. A boiler flue gas treatment apparatus according to claim 7, characterised in that, The circumferential rotation stroke of the rotating shaft (3) includes a reverse stroke, and the pushing block (31) and the contact plate (66) are synchronously moved to adjust the aperture of the air hole (60) when the rotating shaft (3) is in the stroke.

9. A boiler flue gas treatment apparatus according to claim 1, wherein A plurality of limiting frames (2) are further arranged in the dust collector shell (1), and the dust collecting electrode (5) is slidably connected with the limiting frame (2).

10. A method of treating boiler flue gas, characterized in that, The boiler waste heat flue gas treatment device of any one of claims 1-9 further comprises the following steps: S1, the dust discharged from the waste heat boiler is cooled by the heat exchanger, and dust with a temperature of 100-180℃ is obtained; S2, the dust is dried after the dust is sprayed with a chemical agent to adjust the dust resistivity; S3, the flue gas after cooling and conditioning is conveyed into the dust collector shell (1) through the pipeline, so that the dust-containing airflow flows through the plurality of discharging electrodes (41) and the dust collecting electrodes (5) respectively; S4, a 30-100kV high-voltage direct current power supply is connected, so that the air around the discharging electrode (41) is ionized to form a corona region and generate a large number of electrons and a small amount of positive ions, the dust is negatively charged when passing through the corona region by colliding with the electrons and ions, and a small amount of particles are positively charged by electrostatic induction; S5, under the action of electric field force, a large number of dust with negative charge moves to the dust collecting pole (5) of the anode, and dust with positive charge moves to the discharge electrode (41), because the surface area of the dust collecting pole (5) is much larger than that of the discharge electrode (41), most of the dust is adsorbed on the inner wall of the air chamber (7); S6, the adsorbed dust is shaken off through the discharge electrode (41) and the dust collecting pole (5), and falls into the dust hopper (11) at the bottom of the dust collector shell (1); S7, the treated airflow is discharged from the dust collector shell (1).

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