A circular arc anode plate dust collector with shutters

Abstract

The present invention relates to a circular arc anode plate dust collector with shutters, belonging to the technical field of dust collectors. The present invention includes a smoke inlet, a smoke outlet and a dust collector housing, wherein the smoke inlet and the smoke outlet are respectively installed at the two ends of the dust collector housing, and is characterized in that: it also includes a shutter group and a dust removal device, wherein the shutter group and the dust removal device are sequentially installed in the dust collector housing along the flow direction of the smoke, and the dust removal device includes an anode plate and a cathode line, wherein the anode plate is arranged in a circular arc structure. The shutter group separates the smoke and dust in the smoke entering the electric field area downward; the cross section of the circular arc anode plate coincides with the arc centered on the cathode line, thereby maximally ensuring the uniformity of the electric field strength in the corona zone, and increasing the dust collection area under the premise that the volume of the dust collector remains unchanged; the anode plate with a porous area at the edge of the anode plate can effectively improve the secondary dusting of the captured smoke and dust caused by excessive local smoke flow rate, thereby improving the dust removal efficiency.

Description

Technical Field

[0001] The invention relates to an arc-shaped anode plate dust collector with shutters, belonging to the technical field of dust collectors. Background Art

[0002] Smoke dust has become one of the main air pollutants. Electrostatic precipitator technology can effectively control the emission concentration of smoke dust particles in flue gas. This technology has been widely used in the field of flue gas treatment in coal-fired power plants.

[0003] The working principle of the electrostatic precipitator is the cathode wire corona discharge, which forms a high-voltage electric field between the cathode wire and the anode plate, charging the smoke dust. The charged smoke dust moves toward the anode plate under the action of the electric field force and is captured by the anode plate.

[0004] After the anode plate captures the smoke, the smoke falls into the ash hopper at the bottom of the dust collection area under the action of the vibration device and gravity load, and is collected by the ash conveying system and centrally processed.

[0005] In traditional electrostatic precipitators, the smoke components entering the air chamber of the precipitator through the bell mouth are relatively evenly distributed, resulting in a relatively even distribution of dust collection in the longitudinal direction of the anode plate. When the anode plate is vibrated and cleaned, the dust on the upper part of the anode plate falls, which can easily cause secondary dust.

[0006] Traditional "C" type, "Z" type and other anode plates have uneven electric field strength between the cathode wire and the anode plate, which easily causes sparks to flash at the shortest distance between the cathode wire and the anode plate, resulting in a decrease in system output and reduced dust removal efficiency.

[0007] In view of this, the patent document with application number 201210492859.X discloses a flue arrangement suitable for full-load operation of a denitrification device, but its dust removal efficiency is reduced. Summary of the invention

[0008] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide an arc-shaped anode plate dust collector with shutters which has a reasonable structural design and can effectively suppress secondary dust, increase the dust collection area, and avoid spark flashing in power plants.

[0009] The technical solution adopted by the present invention to solve the above-mentioned problem is: the arc-shaped anode plate dust collector with shutters includes a flue gas inlet, a flue gas outlet and a dust collector shell, and the flue gas inlet and the flue gas outlet are respectively installed at the two ends of the dust collector shell, and its characteristics are: it also includes a shutter group and a dust removal device, the shutter group and the dust removal device are sequentially installed in the dust collector shell along the flue gas flow direction, the dust removal device includes an anode plate and a cathode wire, the anode plate cooperates with the cathode wire, and the anode plate is arranged in an arc-shaped structure.

[0010] Furthermore, the arc-shaped anode plate dust collector also includes an ash hopper, which is installed on the dust collector housing.

[0011] Furthermore, the number of the shutter groups and the dust removal devices are both multiple, and the shutter groups and the dust removal devices are arranged at intervals.

[0012] Furthermore, smoke channels are provided on both sides of the anode plate, and the cathode wire is located in the smoke channel.

[0013] Furthermore, the cathode wires are arranged alternately in two adjacent flue gas channels.

[0014] Furthermore, the anode plate includes an anode plate body, which is arranged in an arc-shaped structure, and the anode plate body includes an arc-shaped anode plate inner arc side and an arc-shaped anode plate outer arc side, and the two arc-shaped anode plate inner arc sides and the two arc-shaped anode plate outer arc sides in two adjacent anode plate bodies are arranged opposite to each other.

[0015] Furthermore, the axis of the inner arc side of the arc-shaped anode plate coincides with the cathode line.

[0016] Furthermore, a primary corona zone is arranged between inner arc sides of two adjacent arc-shaped anode plates, the cathode wire is arranged in the primary corona zone, and a secondary corona zone is arranged between outer arc sides of two adjacent arc-shaped anode plates.

[0017] Furthermore, the anode plate body is provided with anode plate longitudinal reinforcement ribs and anode plate transverse reinforcement ribs, and the anode plate longitudinal reinforcement ribs and the anode plate transverse reinforcement ribs are arranged perpendicularly.

[0018] Furthermore, the anode plate body is provided with a porous area on the side of the anode plate and an unperforated area in the middle thereof, the arc corresponding to the anode plate body is α, the value range of α is between 2 / 9π and 5 / 9π, and the arc β corresponding to the unperforated area is between 1 / 2α and 3 / 4α.

[0019] Furthermore, the anode plate body is provided with an anode plate top fixing point, an anode plate side fixing point and an anode plate bottom fixing point.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1. The arc-shaped anode plate dust collector with shutters, the shutter group separates the smoke in the flue gas entering the electric field area to the lower part, the smoke concentration in the lower part is higher than that in the upper part, and the amount of smoke captured in the lower part of the anode plate is greater than that in the upper part of the anode plate in the same flue gas flow section, which effectively suppresses the secondary dust caused by the upper smoke falling into the ash hopper during the anode vibration process, thereby improving the dust removal efficiency.

[0022] 2. The inner arc side of the adjacent arc-shaped anode plates corresponds to a cathode line, and the anode plates can form a uniform corona discharge area on the same arc centered on the cathode line, avoiding the flashover phenomenon that causes a decrease in the electric field output.

[0023] 3. Under the premise of the same dust collector volume, the effective dust collecting area of ​​the arc-shaped anode plate is higher than that of the traditional parallel electrode plate. For the dust collector modification project, there is no need to modify the main structure such as the dust collector shell, but only the internal structure system of the dust collector needs to be modified, which reduces the modification scope and modification cycle and effectively controls the modification cost.

[0024] 4. After the dust-containing flue gas is charged in the corona zone, part of the dust and flue gas that is not collected by the anode plate enters the secondary corona zone from the main corona zone. In the process, the porous area before and after the connection of the anode plate enters the main corona zone of the flue gas channel on the other side of the anode plate and is charged and captured by the electric field; the charged smoke in the dust-containing flue gas that has not passed through the porous area continues to flow to the secondary corona zone. As the smoke flows, the distance between the anode plates gradually decreases, which is conducive to the capture of the smoke by the anode plates.

[0025] 5. The louver group and arc-shaped anode plate dust removal technology can be used alone or in conjunction with a traditional wire plate dust collector or a bag dust collector to achieve the purpose of improving dust removal efficiency, reducing pollutant emission concentration, and saving energy and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the top view of the structure of the arc-shaped anode plate dust collector with shutters according to an embodiment of the present invention.

[0027] Figure 2 It is a schematic side structural view of a circular arc-shaped anode plate dust collector with shutters according to an embodiment of the present invention.

[0028] Figure 3 yes Figure 1 Schematic diagram of the enlarged structure of part A in FIG.

[0029] Figure 4 yes Figure 1 Schematic diagram of the enlarged structure of part B, distribution diagram of a single cathode line and the anode plate corona lines in the nearby area (the density of dotted lines reflects the electric field strength).

[0030] Figure 5 yes Figure 1 The enlarged structural diagram of part C in FIG. 1 is a cross-sectional view of the anode plate.

[0031] Figure 6 yes Figure 2 Schematic diagram of the enlarged structure of part D in FIG.

[0032] Figure 7 It is a schematic diagram of the main structure of the anode plate of an embodiment of the present invention.

[0033] In the figure: flue gas inlet 1, shutter group 2, anode plate 3, cathode line 4, flue gas outlet 5, ash hopper 6, dust collector shell 7, flue gas channel 8,

[0034] Anode plate longitudinal reinforcement ribs 31, anode plate transverse reinforcement ribs 32, anode plate side porous area 33, anode plate top fixing point 34, anode plate side fixing point 35, anode plate bottom fixing point 36, anode plate body 37, arc-shaped anode plate inner arc side 38, arc-shaped anode plate outer arc side 39. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0036] Example

[0037] See also Figures 1 to 7 As shown, it should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, if there are references to terms such as "upper", "lower", "left", "right", "middle" and "one" in this specification, they are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0038] The circular arc anode plate dust collector with shutters in this embodiment includes a flue gas inlet 1, a flue gas outlet 5, a dust collector shell 7, a shutter group 2, a dust removal device and an ash hopper 6. The flue gas inlet 1 and the flue gas outlet 5 are respectively installed at the two ends of the dust collector shell 7, the shutter group 2 and the dust removal device are sequentially installed in the dust collector shell 7 along the flue gas flow direction. The dust removal device includes an anode plate 3 and a cathode line 4, the anode plate 3 cooperates with the cathode line 4, and the anode plate 3 is arranged in an arc shape; the ash hopper 6 is installed on the dust collector shell 7; the shutter group 2 and the dust removal device structure can be used in a single form, and can also be used in conjunction with a traditional anode plate or a bag dust collector.

[0039] In this embodiment, there are multiple shutter groups 2 and dust removal devices, and the shutter groups 2 and dust removal devices are arranged at intervals; smoke channels 8 are provided on both sides of the anode plate 3, and the cathode wires 4 are located in the smoke channels 8; the cathode wires 4 are arranged alternately in two adjacent smoke channels 8.

[0040] The anode plate 3 in this embodiment includes an anode plate body 37, which is arranged in an arc-shaped structure. The anode plate body 37 includes an arc-shaped anode plate inner arc side 38 and an arc-shaped anode plate outer arc side 39. The two arc-shaped anode plate inner arc sides 38 and the two arc-shaped anode plate outer arc sides 39 in two adjacent anode plate bodies 37 are arranged opposite to each other.

[0041] The axis of the inner arc side 38 of the arc-shaped anode plate in this embodiment coincides with the cathode line 4; a primary corona zone is provided between the inner arc sides 38 of two adjacent arc-shaped anode plates, the cathode line 4 is provided in the primary corona zone, and a secondary corona zone is provided between the outer arc sides 39 of two adjacent arc-shaped anode plates.

[0042] The anode plate body 37 in this embodiment is provided with an anode plate top fixing point 34, an anode plate side fixing point 35, an anode plate bottom fixing point 36, an anode plate longitudinal reinforcing rib 31 and an anode plate transverse reinforcing rib 32, and the anode plate longitudinal reinforcing rib 31 and the anode plate transverse reinforcing rib 32 are arranged vertically; the upper part of the anode plate body 37 is fixed by the anode plate bottom fixing point 36, and the lower part is fixed by the anode plate bottom fixing point 36, and the entire anode plate 3 is spliced ​​by the anode plate side fixing point 35.

[0043] The anode plate body 37 in this embodiment is provided with a porous area 33 on the side of the anode plate and an unperforated area in the middle thereof, the arc corresponding to the anode plate body 37 is α, the value range of α is between 2 / 9π and 5 / 9π, and the arc β corresponding to the unperforated area is between 1 / 2α and 3 / 4α; the porous area 33 on the side of the anode plate is provided in both the upstream and downstream directions of the flue gas flow direction of the anode plate body 37.

[0044] Specifically, the dust-laden flue gas enters the shutter group 2 arranged upstream of the dust collecting area in the dust collector shell 7 through the flue gas inlet 1, and the inner arc sides 38 of the arc-shaped anode plates of the anode plate bodies 37 arranged in an arc-shaped structure adjacent to each other along the flue gas flow direction face in opposite directions to form the anode plates 3. The anode plate bodies 37 are macroscopically arranged in parallel along the flue gas flow direction, and the anode plate bodies 37 are provided with anode plate longitudinal reinforcement ribs 31 and anode plate transverse reinforcement ribs 32. The anode plate side porous areas 33 are respectively arranged upstream and downstream of the flue gas of the anode plate body 37. The anode plate body 37 is fixed to the anode plate 3 through the anode plate top fixing point 34, the anode plate bottom fixing point 36, and the anode plate body 37 is fixed to the anode plate 3 through the anode plate side fixing point 35. The cathode lines 4 are staggered according to the arrangement of the anode plates. The removed smoke is collected by the ash hopper 6 and transported to the ash removal device. The clean dust after dust removal enters the downstream equipment through the flue gas outlet 5.

[0045] The louver group 2 is arranged upstream of the anode plate 3 in the air inlet direction. Under the action of the louver group 2, a certain proportion of the smoke in the flue gas is separated to the lower part of the dust collecting area, which can effectively reduce the smoke content in the flue gas in the upper area, reduce the dust collection amount of the upper electrode plate, and thus reduce the secondary dust amount generated during the falling process of the smoke captured in the upper part during the vibration process, thereby improving the overall dust removal efficiency of the dust removal system; the louver group 2 reasonably sets the blade angle, length and number of stages to separate the smoke to the lower part and reduce the impact on the horizontal flow of the flue gas; at the same time, ensure that the flue gas flow rate is evenly distributed in the same flow section to meet the design requirements.

[0046] The inner arc sides 38 of the two arc-shaped anode plates are both on the same arc with the corresponding cathode line 4 as the center, which can ensure that a uniform and stable main corona zone is formed between the cathode line 4 and the anode plate body 37, avoiding the occurrence of flashover during the operation of the traditional dust collector, resulting in a decrease in power output; the smoke that is not captured after being charged in the main corona zone has a smaller distance between the anode plate body 37 when entering the secondary corona zone, which is conducive to the capture of the smoke by the anode plate.

[0047] The inner arc sides 38 of two adjacent arc-shaped anode plates are opposite, and the outer arc sides 39 of two adjacent arc-shaped anode plates are opposite. A cathode wire 4 is arranged between the inner arc sides 38 of the two opposite arc-shaped anode plates, which is called the primary corona zone; the area of ​​the outer arc sides 39 of the two opposite arc-shaped anode plates is the secondary corona zone, and the cathode wires 4 are alternately arranged in two adjacent flue gas channels 8, and the anode plates 3 and the cathode wires 4 together constitute a dust collecting zone.

[0048] The anode plate 3 is formed by splicing together a plurality of anode plate bodies 37 in an arc-shaped structure arranged along the direction of the flue gas flow. The inner arc sides 38 of the adjacent arc-shaped anode plates face in opposite directions along the direction of the flue gas flow, thereby forming a uniform, large wavy arc anode plate 3 with equal radius. The adjacent anode plates 3 are symmetrically connected with the middle cathode line 4. Under the premise of the same volume of the dust collector body, the dust collecting area of ​​the arc-shaped anode plate dust collector with shutters is much higher than that of the traditional electrostatic precipitator technology.

[0049] Anode plate side porous areas 33 are arranged at both ends of each anode plate body 37, and structures such as porous plates or metal meshes can be used to ensure an appropriate amount of flue gas passing capacity. A portion of the smoke that has been charged in the main corona area is captured by the anode plate body 37 when it passes through the anode plate side porous areas 33 along with the smoke; the remaining smoke enters the main corona discharge area on the other side of the anode plate body 37 through the anode plate side porous areas 33, and some of the escaped smoke continues to be charged on the other side, and this cycle repeats until the smoke is captured by the anode plate body 37; to avoid the increase in local flue gas flow velocity caused by the flue gas passing through the main charging area corresponding to the inner arc side 38 of the arc-shaped anode plate and then passing through the narrow flow cross-section formed by the outer arc side 39 of the adjacent arc-shaped anode plate, and the high-speed airflow scours and carries the anode plate in the narrow flow area, that is, the smoke that has been captured on the outer arc side 39 of the arc-shaped anode plate, resulting in a decrease in dust removal efficiency.

[0050] The principle is as follows: α is the arc angle corresponding to the anode plate 3, β is the arc angle corresponding to the unperforated area of ​​the anode plate 3, L1 and L2 are the cross-sectional widths of adjacent flue gas channels 8, and the cross-sectional widths L1 and L2 of two adjacent flue gas channels 8 are equal (e.g. Figure 1 , 3 As shown), it is ensured that the deviation of the flue gas volume entering each flue gas channel 8 is within a reasonable range.

[0051] The smoke inlet 1 of the circular arc anode plate dust collector with shutters is connected to the shutter group 2, the shutter group 2 is composed of a plurality of shutter units, adjacent shutter units are connected to each other, and the shutter group 2 is fixed to the upper, lower and side support beams.

[0052] The smoke passes through the shutter group 2 and separates the smoke to the lower part. Under the combined effect of gravity, the smoke concentration in the lower part is higher than that in the upper part. The smoke capture amount in the lower part of the same flow section in the dust collection area is higher than that in the upper part, thereby avoiding the secondary dust problem caused by the falling of the upper smoke during the vibration process, and effectively improving the dust removal efficiency. Vertical and horizontal anode plate longitudinal reinforcement ribs 31 and anode plate transverse reinforcement ribs 32 are made on the arc surface of each anode plate body 37 to ensure the stability of the anode plate body 37 (such as Figure 4 , 7 as shown).

[0053] The anode plate bodies 37 arranged in the adjacent long arc structures along the flue gas flow direction are spliced ​​to form the anode plate 3 through the anode plate side fixing points 35, the inner arc sides 38 of the adjacent arc-shaped anode plates face in opposite directions, and the anode plate bodies 37 are fixed in the gas chamber by the anode plate top fixing points 34 and the anode plate bottom fixing points 36 suspension devices (such as Figure 7 The adjacent anode plates 3 are symmetrical with the middle cathode line 4 as the symmetry axis to form an anode system (as shown in FIG. Figure 1 as shown).

[0054] The inner arc sides 38 of two adjacent arc-shaped anode plates correspond to one cathode line 4, and the inner arc sides 38 of the two arc-shaped anode plates are on the same circumference with the cathode line 4 as the center. The area opposite to the inner arc sides 38 of the two arc-shaped anode plates is the main corona area, that is, the cathode line 4 discharges and causes the smoke in the smoke channel 8 to be charged and then move toward the anode plate body 37 until it is captured by the anode plate body 37; the area opposite to the outer arc sides 39 of two adjacent arc-shaped anode plates is the secondary corona area, one side of the same anode plate body 37 is the main corona area, and the other side is the secondary corona area, and the electric field strength of the secondary corona area corresponding to the outer arc side 39 of the arc-shaped anode plate is weaker than that of the main corona area (such as Figure 4 The denser the middle dashed lines, the stronger the electric field strength), but the smaller the distance between the anodes, the better for collecting smoke (e.g. Figure 3 , 4 as shown).

[0055] Each anode plate body 37 has an upstream and downstream area (i.e. Figure 5 A porous area 33 is set on the side of the anode plate for circulation (the area of ​​the arc of α arc minus the arc of β arc) to avoid the possibility of excessive local flow velocity when the smoke dust that has been charged upstream passes through the secondary corona area; at the same time, part of the smoke dust in the charged dust-containing flue gas that passes through the porous area 33 on the side of the anode plate can be captured by the anode plate body 37, and part of the escaped smoke dust enters the main corona area on the other side of the anode plate body 37 and is further charged. This reciprocating process continues until the smoke dust is captured (such as Figure 5 , 7 as shown).

[0056] The arc-shaped anode plate dust collector with shutters is a combination of a shutter group 2 and an anode plate 3 with an arc-shaped structure in the dust removal device. It can be a combination of a shutter group 2 and an anode plate 3 with an arc-shaped structure + a shutter group 2 and a traditional anode plate, or a shutter group 2 and an anode plate 3 with an arc-shaped structure + a bag dust collector.

[0057] The ash hopper 6 is located at the lower part of the anode plate 3. The dust removed by the dust collector is collected in the ash hopper and finally transported to the ash removal system; the flue gas outlet 5 is connected to the dust collection area, and the clean flue gas after dust removal enters the downstream equipment through the flue gas outlet 5.

[0058] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the present invention. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. Technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A circular arc anode plate dust collector with shutters, comprising a flue gas inlet (1), a flue gas outlet (5) and a dust collector housing (7), wherein the flue gas inlet (1) and the flue gas outlet (5) are respectively mounted at two ends of the dust collector housing (7), characterized in that: It also comprises a shutter group (2) and a dust removal device, the shutter group (2) and the dust removal device are sequentially installed in the dust collector housing (7) along the flue gas flow direction, the dust removal device comprises an anode plate (3) and a cathode wire (4), the anode plate (3) cooperates with the cathode wire (4), and the anode plate (3) is arranged in an arc-shaped structure; The anode plate (3) comprises an anode plate body (37), the anode plate body (37) is arranged in an arc-shaped structure, the anode plate body (37) comprises an arc-shaped anode plate inner arc side (38) and an arc-shaped anode plate outer arc side (39), and the two arc-shaped anode plate inner arc sides (38) and the two arc-shaped anode plate outer arc sides (39) in two adjacent anode plate bodies (37) are arranged opposite to each other. The axis of the inner arc side (38) of the arc-shaped anode plate coincides with the cathode line (4); The anode plate body (37) is provided with a porous area (33) on the side of the anode plate and an unperforated area in the middle thereof, the arc corresponding to the anode plate body (37) is α, the value range of α is between 2 / 9π and 5 / 9π, and the arc β corresponding to the unperforated area is between 1 / 2α and 3 / 4α.

2. The arc-shaped anode plate dust collector with shutters according to claim 1 is characterized in that: The arc-shaped anode plate dust collector further comprises an ash hopper (6), wherein the ash hopper (6) is mounted on a dust collector housing (7).

3. The arc-shaped anode plate dust collector with shutters according to claim 1 is characterized in that: The number of the shutter groups (2) and the dust removal devices are both multiple, and the shutter groups (2) and the dust removal devices are arranged at intervals.

4. The arc-shaped anode plate dust collector with shutters according to claim 1 is characterized in that: Smoke channels (8) are provided on both sides of the anode plate (3), and the cathode wires (4) are located in the smoke channels (8); and / or the cathode wires (4) are arranged alternately in two adjacent smoke channels (8).

5. The arc-shaped anode plate dust collector with shutters according to claim 1 is characterized in that: A primary corona zone is provided between the inner arc sides (38) of two adjacent arc-shaped anode plates, the cathode wire (4) is provided in the primary corona zone, and a secondary corona zone is provided between the outer arc sides (39) of two adjacent arc-shaped anode plates.

6. The arc-shaped anode plate dust collector with shutters according to claim 1 is characterized in that: The anode plate body (37) is provided with anode plate longitudinal reinforcement ribs (31) and anode plate transverse reinforcement ribs (32), and the anode plate longitudinal reinforcement ribs (31) and the anode plate transverse reinforcement ribs (32) are arranged vertically.

7. The arc-shaped anode plate dust collector with shutters according to claim 1 is characterized in that: The anode plate body (37) is provided with an anode plate top fixing point (34), an anode plate side fixing point (35) and an anode plate bottom fixing point (36).

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