CN111822146A - Pre-charging electric appliance - Google Patents
Pre-charging electric appliance Download PDFInfo
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- CN111822146A CN111822146A CN201910298741.5A CN201910298741A CN111822146A CN 111822146 A CN111822146 A CN 111822146A CN 201910298741 A CN201910298741 A CN 201910298741A CN 111822146 A CN111822146 A CN 111822146A
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- flue gas
- circulation pipeline
- gas circulation
- discharge electrode
- conductive partition
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/04—Plant or installations having external electricity supply dry type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/36—Controlling flow of gases or vapour
- B03C3/361—Controlling flow of gases or vapour by static mechanical means, e.g. deflector
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/40—Electrode constructions
- B03C3/41—Ionising-electrodes
- B03C3/43—Ionising-electrodes radioactive
Abstract
The invention discloses a pre-charging device, which belongs to the technical field of purification and dust removal equipment and comprises a flue gas circulation pipeline, wherein the flue gas circulation pipeline comprises a flue gas inlet and a flue gas outlet, a conductive partition plate is arranged in the flue gas circulation pipeline along the extension direction of the flue gas circulation pipeline, the flue gas circulation pipeline is partitioned by the conductive partition plate to form at least two flue gas channels, a discharge electrode is arranged on the side wall of the flue gas circulation pipeline corresponding to each flue gas channel, and an electric field is formed between each discharge electrode and the corresponding conductive partition plate. The invention separates the flue gas circulation pipeline into at least two flue gas channels by the conductive partition plate, can arrange more discharge electrodes on the flue gas circulation pipeline with unit length, enhances the electric field intensity and can reduce the whole length of the flue gas circulation pipeline. And when the length of the flue gas circulation pipeline is fixed and the number of the discharge electrodes is fixed, the conductive partition plate divides the flue gas, so that the amount of the flue gas passing through is reduced under the same electric field intensity, and the full charge of dust is facilitated.
Description
Technical Field
The invention relates to the technical field of purification and dust removal equipment, in particular to a pre-charging device.
Background
High-efficiency dust removal is a very common industrial operation in various industrial fields such as metallurgy, energy, chemical industry, waste incineration and the like. The removal efficiency of the rear-end filtering material to particles can be greatly increased by charging the particles in the airflow (such as patent numbers CN201410148525.X and CN201510557777.2), because strong electrostatic repulsion is generated between the dust and the dust after the dust is charged, so that the powder cake formed on the surface of the filtering material is in a loose porous structure, and the filtering resistance is obviously reduced.
At present, the pre-charging electric appliance comprises a flue gas pipeline and a charged nozzle arranged on the flue gas pipeline, the charged nozzle and a grounding pipe wall opposite to the charged nozzle form an electric field to charge dust, the discharging current of each charged nozzle is limited, in order to fully charge the dust and ensure the charged effect, a plurality of charged nozzles are required to be arranged frequently, and in order to avoid electric field interference between the charged nozzles, two adjacent charged nozzles must be spaced at a certain distance, so that the length of the flue gas pipeline is longer, and the practicability of the pre-charging electric appliance is reduced.
Therefore, a pre-charger is needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a pre-charging device, so that dust can be fully charged, the length of a flue gas pipeline is reduced, and the practicability of the pre-charging device is improved.
As the conception, the technical scheme adopted by the invention is as follows:
the utility model provides a pre-charge electric appliance, includes flue gas circulation pipeline, flue gas circulation pipeline includes flue gas entry and exhanst gas outlet, be provided with electrically conductive baffle along its extending direction in the flue gas circulation pipeline, electrically conductive baffle will the flue gas circulation pipeline separates and forms two at least flue gas passageways, every the flue gas passageway corresponds all be provided with discharge electrode on the lateral wall of flue gas circulation pipeline, discharge electrode and corresponding form the electric field between the electrically conductive baffle.
Further, the flue gas circulation pipeline is of a circular cylindrical structure, and the width of the conductive partition plate is equal to the inner diameter of the circular cylindrical structure.
Further, the flue gas circulation pipeline is of a circular cylindrical structure, and the width of the conductive partition plate is equal to the inner diameter of the circular cylindrical structure.
Further, the length of the conductive partition plate is equal to the length of the flue gas circulation pipeline.
Further, the pre-charging device further comprises a charged nozzle, the charged nozzle comprises a nozzle shell, a cavity is arranged in the nozzle shell, an opening is formed in one end of the nozzle shell, the discharge electrode is located in the cavity, and the end portion of the discharge electrode faces the opening.
Further, the other end of the charged nozzle is provided with an air inlet which is communicated with dust-free gas, and the dust-free gas can enter the flue gas circulation pipeline along the air inlet, the cavity and the opening in sequence.
Furthermore, a supporting plate for supporting the discharge electrode is arranged in the cavity, a plurality of through holes are uniformly formed in the supporting plate, and the air inlet and the opening are respectively located on two sides of the supporting plate.
Furthermore, the pre-charging device also comprises a high-voltage power supply, one of the discharge electrode and the conductive partition plate is connected to the positive pole of the high-voltage power supply, the other one of the discharge electrode and the conductive partition plate is connected to the negative pole of the high-voltage power supply, and the conductive partition plate is grounded.
Furthermore, the charged nozzle further comprises a high-voltage power supply lead-in wire fixedly arranged in the nozzle shell, and two ends of the high-voltage power supply lead-in wire are respectively connected with the high-voltage power supply and the discharge electrode.
Further, the pre-charging device comprises an ash bucket and a rapping mechanism, wherein the ash bucket is arranged below the flue gas circulation pipeline, and the rapping mechanism is arranged on the outer wall of the flue gas circulation pipeline.
The invention has the beneficial effects that:
according to the pre-charging device provided by the invention, the conductive partition plate is arranged in the flue gas circulation pipeline, the flue gas circulation pipeline is divided by the conductive partition plate to form at least two flue gas channels, and the electric field is formed between the discharge electrode and the corresponding conductive partition plate, so that more discharge electrodes can be arranged on the flue gas circulation pipeline in unit length, the electric field intensity is enhanced, dust can be fully charged, and the whole length of the flue gas circulation pipeline is favorably reduced. And when the length of the flue gas circulation pipeline is fixed, and the number of the discharge electrodes is fixed, the conductive partition plate divides the flue gas, so that the amount of the flue gas passing through is reduced under the same electric field intensity, and the full charge of dust is facilitated.
Drawings
Fig. 1 is a schematic structural diagram of a pre-charging device according to a first embodiment of the present invention;
FIG. 2 is a side view of a pre-load apparatus provided in accordance with an embodiment of the present invention;
fig. 3 is a cross-sectional view of a charged nozzle provided by the present invention.
Fig. 4 is a schematic structural diagram of a pre-charging device provided in the second embodiment of the present invention;
fig. 5 is a top view of a pre-charging device provided in the second embodiment of the present invention;
fig. 6 is a schematic structural diagram of a pre-charging device provided in the third embodiment of the present invention;
fig. 7 is a top view of a pre-charging device provided in the third embodiment of the present invention;
fig. 8 is a schematic structural diagram of a pre-charging device provided in the fourth embodiment of the present invention;
fig. 9 is a top view of a pre-charging device provided in accordance with a fourth embodiment of the present invention;
fig. 10 is a schematic structural diagram of a pre-charging device provided in the fifth embodiment of the present invention;
fig. 11 is a top view of a pre-charging device according to a fifth embodiment of the present invention.
In the figure:
1. a flue gas circulation duct; 101. a flue gas inlet; 102. a flue gas outlet; 11. a conductive separator;
21. a high voltage power supply; 22. a charging nozzle; 221. a nozzle housing; 2210. a cavity; 2211. an opening; 222. a high voltage power supply lead-in; 223. a discharge electrode; 224. an air inlet; 225. a support plate; 2251. a vent hole;
3. a dust-free gas pipeline.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Example one
Fig. 1 is a schematic structural diagram of a pre-charging device provided in this embodiment; fig. 2 is a side view of the pre-charger provided in the present embodiment. As shown in fig. 1 and 2, the present embodiment provides a pre-charger comprising a flue gas circulation duct 1. In this embodiment, the flue gas circulation pipe 1 is vertically arranged, the flue gas circulation pipe 1 is a cylindrical structure with two open ends, one end is a flue gas inlet 101, and the other end is a flue gas outlet 102, and in other embodiments, the shape of the flue gas circulation pipe 1 can be arranged according to actual needs, such as a polygonal cylindrical structure. Be provided with electrically conductive baffle 11 along its extending direction in flue gas circulation pipeline 1, electrically conductive baffle 11 separates flue gas circulation pipeline 1 and forms two at least flue gas passageways, and in this embodiment, electrically conductive baffle 11 is provided with one, and electrically conductive baffle 11's width equals flue gas circulation pipeline 1's internal diameter, and electrically conductive baffle 11's length equals flue gas circulation pipeline 1's length, consequently, electrically conductive baffle 11 separates flue gas circulation pipeline 1 and forms two flue gas passageways. Of course, in other embodiments, the number of the conductive partition plates 11 may be set according to actual needs, such as more than two. In addition, the conductive partition 11 may be fixed in the flue gas flowing pipe 1 by welding, riveting, clamping, and the like, which is not limited in this embodiment.
For convenience of the subsequent description, partial side walls of the flue gas circulation pipe 1 corresponding to the two flue gas channels are named as a first side wall and a second side wall, and the first side wall and the second side wall are both of semi-cylindrical structures.
The pre-charging device further comprises a plurality of charging nozzles 22, each charging nozzle 22 is internally provided with a discharging electrode 223, an electric field is formed between the discharging electrode 223 and the conductive partition 11, so that dust in the electric field is charged, and specifically, in the embodiment, the radius of the discharging electrode 223 is 50 μm-1 mm. The plurality of charged nozzles 22 are all disposed on the side wall of the flue gas flowing pipe 1, and the charged nozzles 22 are disposed on the first side wall and the second side wall, specifically, in this embodiment, six charged nozzles 22 are provided, the six charged nozzles 22 are divided into two groups, one group (three) of the charged nozzles 22 are disposed on the first side wall, the other group (three) of the charged nozzles 22 are disposed on the second side wall, and two pairs of the three charged nozzles 22 on the first side wall and two pairs of the three charged nozzles 22 on the second side wall are disposed oppositely. Of course, the number and arrangement of the charging nozzles 22 are not limited to this, and the number and arrangement of the charging nozzles 22 may be set according to actual needs, and are not listed here.
The pre-charger further includes a high voltage power supply 21, one of the discharge electrode 223 and the conductive spacer 11 is connected to a positive electrode of the high voltage power supply 21, the other is connected to a negative electrode of the high voltage power supply 21, and the conductive spacer 11 is grounded. In the present embodiment, there is one high voltage power supply 21, each discharge electrode 223 is connected to the negative pole of the high voltage power supply 21, the conductive partition 11 is connected to the positive pole of the high voltage power supply 21 and grounded, in this case, the discharge electrode 223 is the negative pole, the conductive partition 11 is the positive pole, and an electric field is formed between the discharge electrode 223 and the conductive partition 11 (as shown in fig. 2). Of course, in other embodiments, the number of the high voltage power supplies 21 may be set according to actual requirements, for example, each high voltage power supply 21 is correspondingly connected to one or two discharge electrodes 223. Specifically, the high voltage power supply 21 may be a dc high voltage power supply, an ac high voltage power supply or a pulsed high voltage power supply, and the waveform of the high voltage power supply 21 may be a non-wave, square wave, tooth wave or sine wave, and the voltage range is 1kV to 100kV or-100 kV to-1 kV. In addition, in the present embodiment, the flue gas flow pipe 1 is also made of a conductive material, so that the flue gas flow pipe 1 may be directly connected to the positive electrode of the high voltage power supply 21 and grounded.
Fig. 3 is a sectional view of the charging nozzle provided in this embodiment. As shown in fig. 3, the above-described charging nozzle 22 includes a nozzle housing 221, and the nozzle housing 221 is made of an insulating material, such as ceramic. A cavity 2210 is arranged in the nozzle shell 221, an opening 2211 is arranged at one end of the nozzle shell 221, the discharge electrode 223 is arranged in the cavity 2210, the end part of the discharge electrode 223 faces the opening 2211, an electric field is formed between the discharge electrode 223 and the conductive partition 11, and dust in the flue gas is charged in the electric field. Further, the other end of the nozzle housing 221 is opened with an air inlet 224, a support plate 225 for supporting the discharge electrode 223 is provided inside the nozzle housing 221, a plurality of air holes 2251 are uniformly opened on the support plate 225, and the air inlet 224 and the opening 2211 are respectively located at both sides of the support plate 225. Let in dustless gas in to cavity 2210 through air inlet 224, dustless gas can follow air inlet 224 in proper order, cavity 2210 and opening 2211 enter into flue gas circulation pipeline 1, and evenly distributed in cavity 2210 after a plurality of air vents 2251, make discharge electrode 223 protected in dustless air current, isolated dust and discharge electrode 223 have been carried out, avoid piling up the dust on discharge electrode 223, and then can make electric field strength remain stable, improve the job stabilization nature of pre-charge electrical apparatus. Specifically, in the present embodiment, the flow rate of the dust-free gas at the discharge electrode 223 is 0.5m/s to 20 m/s.
It should be noted that the flue gas in the flue gas flow duct 1 moves from the flue gas inlet 101 to the flue gas outlet 102 at a certain flow velocity, and the longer the dust stays in the electric field, the more the dust is charged. The dust-free airflow contacts with the flue gas in the flue gas flow pipeline 1 after being sprayed out from the opening 2211, so that the flow state of the flue gas is complicated, the retention time of the flue gas in an electric field can be prolonged, the dust in the flue gas is fully charged, and the charging effect is improved.
The charging nozzle 22 further includes a high-voltage power supply lead-in wire 222, the high-voltage power supply lead-in wire 222 is fixedly disposed between the nozzle housing 221 and the support plate 225, and both ends of the high-voltage power supply lead-in wire 222 are respectively connected to the high-voltage power supply 21 and the discharge electrode 223.
As shown in fig. 2, the pre-charger of the present embodiment further includes a dust-free gas pipe 3, one end of the dust-free gas pipe 3 is connected to a compressed gas source, and the other end is connected to the gas inlet 224 of each charging nozzle 22, so that the dust-free gas can be supplied into the cavity 2210 of each charging nozzle 22.
The pre-charging device provided by the embodiment further comprises an ash bucket and a rapping mechanism (not shown in the figure), wherein the ash bucket is positioned below the flue gas circulation pipeline 1, and the rapping mechanism is arranged on the outer wall of the flue gas circulation pipeline 1 and is used for rapping the flue gas circulation pipeline 1 and knocking accumulated dust on the flue gas circulation pipeline 1 off to fall into the ash bucket. Specifically, in this embodiment, the rapping structure includes a motor and a rapping hammer, and the motor can drive the rapping hammer to continuously rap the flue gas circulation pipeline 1 or the motor drives the rapping hammer to rap the flue gas circulation pipeline 1 once at an interval of a preset time.
To sum up, the precharge apparatus that this embodiment provided, through set up conducting baffle 11 in flue gas circulation pipeline 1, conducting baffle 11 separates flue gas circulation pipeline 1 and forms two flue gas passageways, and forms the electric field between discharge electrode 223 and conducting baffle 11, can set up more discharge electrode 223 on unit length's flue gas circulation pipeline 1, strengthens electric field strength for the dust can fully be charged, is favorable to reducing the whole length of flue gas circulation pipeline 1, improves precharge apparatus's practicality. Moreover, when the length of the flue gas flowing pipeline 1 is fixed, and the number of the discharge electrodes 223 is fixed, the conductive partition plate 11 divides the flue gas, so that the amount of the flue gas passing through is reduced under the same electric field intensity, and the full charge of dust is facilitated.
Illustratively, the above embodiment is described by a set of experimental data, two sets of charging nozzles 22 are arranged on a cylindrical flue gas flowing pipe 1 with a diameter of 20cm along the gas flow direction, each flue gas channel corresponds to one set (four) of charging nozzles 22, the axial direction of each charging nozzle 22 is perpendicular to the pipe wall of the flue gas flowing pipe 1, the flue gas flow speed in the flue gas flowing pipe 1 is 10m/s to 18m/s, the vertical depth of the charging nozzles 22 penetrating into the flue gas flowing pipe 1 is 2cm, the sum of the gas flows of the sets (four) of charging nozzles 22 is 80L/min, the dust-free gas pressure is 0.4MPa, the load voltage of the discharging electrodes 223 in the charging nozzles 22 is-30 kV, a tip discharging electrode with a curvature radius of 100um is adopted, the dust-free gas flow speed at the end point of the tip discharging electrode is 0.5m/s, and the electric field formed between the four discharging electrodes 223 in the set (four) of charging nozzles 22 and the conductive partition 11 can successfully treat the flue gas 10g/m3And (D50 ═ 8um) dust is charged, the charged dust forms loose and porous powder cakes on the dust collection cloth bag, and the filtration pressure drop of the powder cakes in the same filtration time is only 42% of that in the case of not using the charge. This is because the charged dust forms a cake having a loose and porous structure, and the filtration resistance can be significantly reduced.
Example two
Fig. 4 is a schematic structural diagram of the pre-charging device provided in this embodiment; fig. 5 is a top view of the pre-charger provided in this embodiment. As shown in fig. 4 and 5, the structure of the pre-charger provided in this embodiment is substantially the same as that of the pre-charger in the first embodiment, except that: in the flue gas flowing pipe 1 in this embodiment, two conductive partition plates 11 are disposed therein, and the two conductive partition plates 11 are perpendicular to each other, that is, the flue gas flowing pipe 1 in this embodiment is partitioned by the two conductive partition plates 11 to form four flue gas channels, and certainly in other embodiments, the maximum angle between the two conductive partition plates 11 may be set to be greater than 90 ° and less than 180 °. A group of (three) charged nozzles 22 are arranged on the side wall of the flue gas circulation pipeline 1 corresponding to each flue gas channel, the three charged nozzles 22 are arranged at equal intervals along the axis direction of the flue gas circulation pipeline 1, in other embodiments, the two conductive partition plates 11 can also be arranged at preset included angles, and the number and arrangement mode of the charged nozzles 22 can also be set according to actual needs, which are not listed one by one.
The rest of the structure of the pre-charging device provided in this embodiment is the same as that of the pre-charging device in the first embodiment, and the description thereof is not repeated.
Illustratively, the above embodiment is described by a set of experimental data, four sets of charging nozzles 22 are arranged on a cylindrical flue gas flow pipe 1 with a diameter of 40cm along the gas flow direction, each flue gas channel corresponds to one set (three) of charging nozzles 22, the axial direction of each charging nozzle 22 is perpendicular to the pipe wall of the flue gas flow pipe 1, the flue gas flow speed in the flue gas flow pipe 1 is 10m/s to 18m/s, the vertical depth of the charging nozzle 22 penetrating into the flue gas flow pipe 1 is 5cm, the sum of the gas flows of the sets (three) of charging nozzles 22 is 280L/min, the dust-free gas pressure is 0.3MPa, the load voltage of a discharge electrode 223 in each charging nozzle 22 is-100 kV, a tip discharge electrode with a curvature radius of 100 micrometers is adopted, the dust-free gas flow speed at the end point of the tip discharge electrode is 10m/s, and the electric fields formed between the three discharge electrodes 223 in one set (three) of charging nozzles 22 and the corresponding two conductive partition plates 11 can be formed Successfully treat 8.8g/m in the smoke3Charging the dust with a concentration ofThe charged dust forms loose and porous powder cakes on the dust collection cloth bag, and the filtration pressure drop of the powder cakes in the same filtration time is only 30% of that when the charge is not used. This is because the charged dust forms a cake having a loose and porous structure, and the filtration resistance can be significantly reduced.
EXAMPLE III
Fig. 6 is a schematic structural diagram of the pre-charging device provided in this embodiment; fig. 7 is a top view of the pre-charger according to the present embodiment. As shown in fig. 6 and 7, the structure of the pre-charger provided in this embodiment is substantially the same as that of the pre-charger in the second embodiment, except that: the flue gas flow pipe 1 in this embodiment is a rectangular tubular structure, specifically, in this embodiment, the flue gas flow pipe 1 is a square tubular structure, and two mutually perpendicular conductive partition plates 11 are also arranged in the square tubular structure, and the two conductive partition plates 11 are respectively overlapped with two diagonal faces of the square tubular structure, that is, the width of the conductive partition plate 11 is equal to the length of the diagonal face of the cross section of the square tubular structure. The two conductive partition plates 11 partition the flue gas circulation pipeline 1 into four flue gas channels, a group of (three) charged nozzles 22 are arranged on the side wall of the flue gas circulation pipeline 1 corresponding to each flue gas channel, and the three charged nozzles 22 are arranged at equal intervals along the axis direction of the flue gas circulation pipeline 1, but the number and the arrangement mode of the charged nozzles 22 are not limited to the above, and the number and the arrangement mode of the charged nozzles 22 can be set according to actual needs.
The rest of the structure of the pre-charging device provided in this embodiment is the same as that of the pre-charging device in the second embodiment, and the description thereof is not repeated.
The above examples are illustrated below by providing several sets of experimental data.
A first group:
four groups of charged nozzles 22 are arranged on a square flue gas flow pipeline 1 with the side length of the cross section of 50cm along the flue gas flow direction, each flue gas channel is correspondingly provided with one group (three) of charged nozzles 22, the axial direction of each charged nozzle 22 is right-angled to the pipe wall of the flue gas flow pipeline 1, the flue gas flow speed in the flue gas flow pipeline 1 is 10-18 m/s, and the vertical depth of the charged nozzle 22 penetrating into the flue gas flow pipeline 1 is 2cm, the sum of the gas amount of the group (three) of charged nozzles 22 is 400L/min, the dust-free gas pressure is 0.5MPa, the load voltage of the discharge electrode 223 in the charged nozzle 22 is 100kV, a point discharge electrode with the curvature radius of 1mm is adopted, the dust-free gas flow rate at the endpoint of the point discharge electrode is 10m/s, and an electric field formed between the three discharge electrodes 223 in the group (three) of charged nozzles 22 and the corresponding two conductive partition plates 11 can successfully treat 9.8g/m in the flue gas3The dust with the concentration is charged, loose and porous powder cakes are formed on the dust collection cloth bag by the charged dust, and the filtration pressure drop of the powder cakes in the same filtration time is only 48 percent of that when the charge is not used. This is because the charged dust forms a cake having a loose and porous structure, and the filtration resistance can be significantly reduced.
Second group:
four groups of charged nozzles 22 are arranged on a square flue gas flow pipeline 1 with the side length of the cross section of 50cm along the flue gas flow direction, each flue gas channel is correspondingly provided with one group of (five) charged nozzles 22, the axial direction of each charged nozzle 22 is perpendicular to the pipe wall of the flue gas flow pipeline 1, the flue gas flow speed in the flue gas flow pipeline 1 is 10 m/s-18 m/s, the vertical depth of the charged nozzles 22 penetrating into the flue gas flow pipeline 1 is 2cm, the sum of the gas flows of the group of (five) charged nozzles 22 is 800L/min, the dust-free gas pressure is 0.5MPa, the load voltage of a discharge electrode 223 in each charged nozzle 22 is-60 kV, a tip discharge electrode with the curvature radius of 50um is adopted, the dust-free gas flow speed on the end point of the tip discharge electrode is 5m/s, and the electric field formed between the five discharge electrodes 223 in the group of (five) charged nozzles 22 and the corresponding two conductive partition plates 11 can successfully carry out 6.4 g.3The dust with the concentration is charged, loose and porous powder cakes are formed on the dust collection cloth bag by the charged dust, and the filtration pressure drop of the powder cakes in the same filtration time is only 37% of that when the charge is not used. This is because the charged dust forms a cake having a loose and porous structure, and the filtration resistance can be significantly reduced.
Third group:
four groups of charging nozzles 22 are arranged on a square flue gas flow pipeline 1 with the side length of the cross section of 50cm along the flue gas flow direction, each flue gas channel is correspondingly provided with one group (five) of charging nozzles 22, and the charging nozzlesThe 22 axial direction and the pipe wall of the flue gas flowing pipe 1 are at right angle, the flue gas flow velocity in the flue gas flowing pipe 1 is 10 m/s-18 m/s, the vertical depth of the charged nozzles 22 penetrating into the flue gas flowing pipe 1 is 3cm, the sum of the gas amount of a group of (five) charged nozzles 22 is 120L/min, the dust-free gas pressure is 0.5MPa, the load voltage of discharge electrodes 223 in the charged nozzles 22 is 20kV, a tip discharge electrode with the curvature radius of 50um is adopted, the dust-free gas flow velocity on the end point of the tip discharge electrode is 20m/s, and an electric field formed between the five discharge electrodes 223 in the group of (five) charged nozzles 22 and the corresponding two conductive partition plates 11 can successfully carry out treatment on 5.5 g/m/s in the flue gas3The dust with the concentration is charged, loose and porous powder cakes are formed on the dust collection cloth bag by the charged dust, and the filtration pressure drop of the powder cakes in the same filtration time is only 51.2% of that of the powder cakes when the charge is not used. This is because the charged dust forms a cake having a loose and porous structure, and the filtration resistance can be significantly reduced.
Example four
Fig. 8 is a schematic structural diagram of the pre-charging device provided in this embodiment; fig. 9 is a top view of the pre-charger according to the present embodiment. As shown in fig. 8 and 9, the structure of the pre-charger provided in this embodiment is substantially the same as that of the pre-charger in the third embodiment, except that: in this embodiment, the two conductive partition plates 11 are perpendicular to each other, each conductive partition plate 11 is located between two opposite side surfaces of the flue gas flowing pipe 1, the width of each conductive partition plate 11 is equal to the length of the side length of the cross section of the square tubular structure, and at this time, the charge nozzle 22 is arranged at the joint of two adjacent side walls of the flue gas flowing pipe 1.
The remaining structure of the precharge device provided in this embodiment is the same as that of the precharge device in the third embodiment, and the details are not repeated here.
The above examples are illustrated below by providing several sets of experimental data.
A first group:
four groups of charged nozzles 22 are arranged on a square flue gas flow pipeline 1 with the side length of 100cm of the cross section along the flue gas flow direction, each flue gas channel is correspondingly provided with one group (four) of charged nozzles 22, and the charged nozzles 22 are axially arranged with the flue gas flow pipeline 1The pipe wall of the flue gas flow pipe is in a right angle, the flue gas flow speed in the flue gas flow pipe 1 is 10 m/s-18 m/s, the vertical depth of the charged nozzles 22 penetrating into the flue gas flow pipe 1 is 10cm, the sum of the gas amount of a group of (four) charged nozzles 22 is 200L/min, the dust-free gas pressure is 0.5MPa, the load voltage of the discharge electrodes 223 in the charged nozzles 22 is-10 kV, the tip discharge electrodes with the curvature radius of 500um are adopted, the dust-free gas flow speed on the end points of the tip discharge electrodes is 8m/s, and the electric field formed between the four discharge electrodes 223 in the group of (four) charged nozzles 22 and the corresponding two conductive partition plates 11 can successfully carry out treatment on the 7.85 g/m/3The dust with the concentration is charged, loose and porous powder cakes are formed on the dust collection cloth bag by the charged dust, and the filtration pressure drop of the powder cakes in the same filtration time is only 52% of that of the powder cakes when the charge is not used. This is because the charged dust forms a cake having a loose and porous structure, and the filtration resistance can be significantly reduced.
Second group:
four groups of charged nozzles 22 are arranged on a square flue gas flow pipeline 1 with the side length of the cross section of 100cm along the flue gas flow direction, each flue gas channel is correspondingly provided with one group (six) of charged nozzles 22, the axial direction of the charged nozzles 22 is perpendicular to the pipe wall of the flue gas flow pipeline 1, the flue gas flow speed in the flue gas flow pipeline 1 is 10 m/s-18 m/s, the vertical depth of the charged nozzles 22 penetrating into the flue gas flow pipeline 1 is 10cm, the sum of the gas amount of the group (six) of charged nozzles 22 is 150L/min, the dust-free gas pressure is 0.5MPa, the load voltage of a discharge electrode 223 in the charged nozzles 22 is-10 kV, a tip discharge electrode with the curvature radius of 500um is adopted, the dust-free gas flow speed on the tip discharge electrode end point is 8m/s, the electric field formed between the six discharge electrodes 223 in one set (six) of the charging nozzles 22 and the corresponding two conductive partition plates 11 can successfully reach 10.45g/m of the flue gas.3The dust with the concentration is charged, loose and porous powder cakes are formed on the dust collection cloth bag by the charged dust, and the filtration pressure drop of the powder cakes in the same filtration time is only 52% of that of the powder cakes when the charge is not used. This is because the charged dust forms a cake having a loose and porous structure, and the filtration resistance can be significantly reduced.
EXAMPLE five
Fig. 10 is a schematic structural diagram of the precharge device provided in this embodiment; fig. 11 is a top view of the pre-charger according to the present embodiment. As shown in fig. 10 and 11, the pre-charger provided in this embodiment has substantially the same structure as the pre-charger in the third embodiment, except that: the flue gas flow pipe 1 in this embodiment is a rectangular tubular structure, three conductive partition plates 11 are arranged in the flue gas flow pipe, and are named as a first conductive partition plate, a second conductive partition plate and a third conductive partition plate respectively, wherein the first conductive partition plate is parallel to a side edge in the thickness direction of the rectangular tubular structure, and is located at the middle position of two side edges in the thickness direction of the rectangular tubular structure, the second conductive partition plate and the third conductive partition plate are perpendicular to the first conductive partition plate, wherein the width of the first conductive partition plate is equal to half of the length of the cross section of the rectangular tubular structure, and the width of the second conductive partition plate and the width of the third conductive partition plate are equal to the width of the cross section of the rectangular tubular structure. The three conductive partition plates 11 divide the flue gas circulation pipeline 1 into four flue gas channels, three charged nozzles 22 are arranged on the side wall of the flue gas circulation pipeline 1 corresponding to each flue gas channel, and the three charged nozzles 22 are arranged at equal intervals along the axial direction of the flue gas circulation pipeline 1, but the number and the arrangement mode of the charged nozzles 22 are not limited to the above, and the number and the arrangement mode of the charged nozzles 22 can be set according to actual needs.
The remaining structure of the precharge device provided in this embodiment is the same as that of the precharge device in the third embodiment, and the details are not repeated here.
Illustratively, the above embodiment is described by using a set of experimental data, four sets of charging nozzles 22 are arranged on a rectangular flue gas flow pipe 1 with a cross section width of 50cm and a length of 100 sides along the flue gas flow direction, each flue gas channel corresponds to one set (three) of charging nozzles 22, the axial direction of each charging nozzle 22 is perpendicular to the pipe wall of the flue gas flow pipe 1, the flue gas flow speed in the flue gas flow pipe 1 is 10 m/s-18 m/s, the vertical depth of each charging nozzle 22 penetrating into the flue gas flow pipe 1 is 3cm, the sum of the gas amount of one set (five) of charging nozzles 22 is 400L/min, the dust-free gas pressure is 0.5MPa, the load voltage of a discharge electrode 223 in each charging nozzle 22 is-20 kV, a tip discharge electrode with a curvature radius of 200um is used, and the sum of the gas amount at the tip discharge electrode is 400L/minThe flow rate of the dust-free gas is 20m/s, and the electric field formed between the five discharge electrodes 223 in the group of (five) charging nozzles 22 and the corresponding one or three conductive partition plates 11 can successfully treat 20.3g/m of flue gas3The dust with the concentration is charged, loose and porous powder cakes are formed on the dust collection cloth bag by the charged dust, and the filtration pressure drop of the powder cakes in the same filtration time is only 55.4% of that when the charge is not used. This is because the charged dust forms a cake having a loose and porous structure, and the filtration resistance can be significantly reduced.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The pre-charging device is characterized by comprising a flue gas circulation pipeline (1), wherein the flue gas circulation pipeline (1) comprises a flue gas inlet (101) and a flue gas outlet (102), a conductive partition plate (11) is arranged in the flue gas circulation pipeline (1) along the extension direction of the flue gas circulation pipeline, the flue gas circulation pipeline (1) is separated by the conductive partition plate (11) to form at least two flue gas channels, each flue gas channel corresponds to a discharge electrode (223) arranged on the side wall of the flue gas circulation pipeline (1), and an electric field is formed between the discharge electrode (223) and the corresponding conductive partition plate (11).
2. The charger according to claim 1, characterized in that said flue gas circulation duct (1) is a circular cylindrical structure, the width of said conductive partition (11) being equal to the internal diameter of said circular cylindrical structure.
3. The pre-charger according to claim 1, characterized in that the flue gas circulation duct (1) is a rectangular tubular structure, the width of the conductive partition (11) being equal to the width, length or diagonal length of the cross section of the rectangular tubular structure.
4. The pre-charger according to any of claims 1 to 3, characterized in that the length of said conductive partition (11) is equal to the length of said flue gas circulation duct (1).
5. The charger according to claim 1, further comprising a charging nozzle (22), wherein the charging nozzle (22) comprises a nozzle housing (221), a cavity (2210) is arranged in the nozzle housing (221), an opening (2211) is opened at one end of the nozzle housing (221), the discharge electrode (223) is positioned in the cavity (2210), and an end of the discharge electrode (223) is arranged towards the opening (2211).
6. The charger according to claim 5, characterized in that the other end of the charging nozzle (22) is provided with an air inlet (224), and the air inlet (224) is communicated with dust-free gas, and the dust-free gas can enter the flue gas flowing pipe (1) along the air inlet (224), the cavity (2210) and the opening (2211) in sequence.
7. The pre-charger according to claim 6, characterized in that a supporting plate (225) for supporting the discharge electrode (223) is disposed in the cavity (2210), a plurality of through holes (2251) are uniformly opened on the supporting plate (225), and the air inlet (224) and the opening (2211) are respectively disposed on two sides of the supporting plate (225).
8. The pre-charger according to claim 5, further comprising a high voltage power supply (21), one of the discharge electrode (223) and the conductive separator (11) being connected to a positive pole of the high voltage power supply (21) and the other being connected to a negative pole of the high voltage power supply (21), the conductive separator (11) being grounded.
9. The charger according to claim 8, wherein the charging nozzle (22) further comprises a high-voltage power supply lead-in wire (222) fixed in the nozzle housing (221), and both ends of the high-voltage power supply lead-in wire (222) are respectively connected to the high-voltage power supply (21) and the discharge electrode (223).
10. The pre-charging appliance according to claim 1, characterized in that it comprises an ash hopper arranged below the flue gas flow pipe (1) and a rapping mechanism arranged on the outer wall of the flue gas flow pipe (1).
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| CN201910298741.5A CN111822146A (en) | 2019-04-15 | 2019-04-15 | Pre-charging electric appliance |
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