WO2023199662A1 - 集塵システム及び集塵方法 - Google Patents
集塵システム及び集塵方法 Download PDFInfo
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- WO2023199662A1 WO2023199662A1 PCT/JP2023/009088 JP2023009088W WO2023199662A1 WO 2023199662 A1 WO2023199662 A1 WO 2023199662A1 JP 2023009088 W JP2023009088 W JP 2023009088W WO 2023199662 A1 WO2023199662 A1 WO 2023199662A1
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- droplets
- dust collection
- collection system
- fine particles
- electrostatic
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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
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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
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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
- B03C3/01—Pretreatment of the gases prior to electrostatic precipitation
- B03C3/014—Addition of water; Heat exchange, e.g. by condensation
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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
- B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
-
- 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
- B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
- B03C3/0175—Amassing particles by electric fields, e.g. agglomeration
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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
- B03C3/08—Plant or installations having external electricity supply dry type characterised by presence of stationary flat electrodes arranged with their flat surfaces parallel to the gas stream
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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
- B03C3/16—Plant or installations having external electricity supply wet 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
- B03C2201/00—Details of magnetic or electrostatic separation
- B03C2201/10—Ionising electrode with two or more serrated ends or sides
Definitions
- the present disclosure relates to a dust collection system and a dust collection method.
- Dust collection systems that collect particulates contained in the exhaust gas are installed as exhaust gas treatment equipment.
- Dust collection systems include electrostatic precipitators, which create an electric field in the passage of exhaust gas to collect charged particles by adhering them to electrodes, and wet-type dust collectors, which spray droplets into the exhaust gas and collect the particles with the droplets.
- dust collectors and cyclone-type dust collectors that rotate exhaust gas and centrifugally separate fine particles.
- Patent Document 1 and Patent Document 2 describe systems that spray droplets onto the upstream side of an electrostatic precipitator.
- the present disclosure has been made in view of such problems, and it is an object of the present disclosure to provide a dust collection system and a dust collection method that can efficiently collect particulates contained in gas.
- the dust collection system of the present disclosure for solving the above problems includes a distribution channel through which gas flows, a droplet supply section that supplies droplets to the distribution channel, and a distribution section downstream from the supply position of the droplets.
- an electrostatic agglomeration section that is arranged in the path and forms an electric field in the flow path of the gas, charges the fine particles and the droplets contained in the gas, and causes them to collide (agglomerate); and an electrostatic aggregation section downstream of the electrostatic aggregation section
- a dust collecting section is disposed in the side flow path and collects the droplets and the fine particles.
- the dust collection method of the present disclosure for solving the above problems includes the steps of supplying droplets to a distribution path through which gas flows, forming an electric field in the distribution path downstream of the supply position of the droplets, and A step of charging the fine particles and the liquid droplets contained in the gas and causing them to collide (agglomerate), and collecting the liquid droplets and the fine particles in a distribution path downstream from the position where the fine particles and the liquid droplets are charged.
- the method includes the steps of:
- fine particles contained in gas can be efficiently collected.
- FIG. 1 is a schematic diagram showing a schematic configuration of a combustion plant having a dust collection system according to the present embodiment.
- FIG. 2 is a perspective view showing a schematic configuration of the dust collection system.
- FIG. 3 is a sectional view showing a schematic configuration of the dust collection system shown in FIG. 2.
- FIG. 4 is an explanatory diagram illustrating processing of the dust collection system.
- FIG. 5 is an explanatory diagram illustrating the processing of the dust collection system.
- FIG. 6 is a perspective view showing a schematic configuration of a dust collection system according to another embodiment.
- FIG. 7 is a sectional view showing a schematic configuration of the dust collection system shown in FIG. 6.
- FIG. 8 is a perspective view showing a schematic configuration of a dust collection system according to another embodiment.
- FIG. 9 is a perspective view showing a schematic configuration of a dust collection system according to another embodiment.
- FIG. 10 is a perspective view showing a schematic configuration of a dust collection system according to another embodiment.
- the dust collection system and dust collection method according to the present disclosure will be described below with reference to the drawings. Note that what is described in this disclosure is one embodiment of the present invention, and the present invention is not limited thereby.
- the dust collection system will be described as a case in which exhaust gas combusted by a combustion device is treated, but the present invention is not limited to this.
- the dust collection system can be used to collect various particulates contained in gas. For example, it can be used as a system for collecting particulates contained in the air in a manufacturing factory, or as a system for collecting particulates, such as dust, at a work site such as demolition work. Further, the fine particles are not limited to solid particles, and may be liquid particles such as droplets or tar.
- FIG. 1 is a schematic diagram showing a schematic configuration of a combustion plant having a dust collection system according to the present embodiment.
- the combustion plant 10 shown in FIG. 1 includes a combustion device 12 and a dust collection system 14.
- the combustion device 12 is a device that burns fossil fuels, incineration materials, etc.
- the combustion device 12 discharges exhaust gas generated during combustion.
- the heat generated by burning the target, contained in the exhaust gas, can be used for power generation or as a heat source.
- the combustion plant 10 may include an exhaust heat recovery device that recovers heat from the exhaust gas and an exhaust gas treatment device that processes harmful components other than particulates in the exhaust gas path.
- FIG. 2 is a perspective view showing a schematic configuration of the dust collection system.
- FIG. 3 is a sectional view showing a schematic configuration of the dust collection system shown in FIG. 2.
- the dust collection system 14 collects particulates contained in the exhaust gas discharged from the combustion device 12.
- the dust collection system 14 includes a distribution path 20 , a droplet supply section 21 , an electrostatic aggregation section 22 , an electrostatic precipitator 24 , and a blower 26 .
- the flow path 20 is a pipe through which exhaust gas generated by the combustion device 12 flows in a flow direction 30.
- a droplet supply section 21, an electrostatic agglomeration section 22, an electrostatic precipitator 24, and a blower 26 are arranged in this order from the upstream side of the flow direction 30.
- the droplet supply unit 21 injects liquid into the circulation channel 20 to form a large number of droplets.
- the droplet supply section 21 includes a plurality of nozzles 40.
- the nozzle 40 sprays a liquid to form droplets having a particle size within a predetermined range.
- the electrostatic aggregation unit 22 is arranged downstream of the nozzle 40 of the droplet supply unit 21 in the circulation channel 20.
- the electrostatic aggregation unit 22 forms an electric field in a region through which the particles and droplets pass, and charges the particles and droplets. Charged particles and droplets move in an electric field due to diffusion and electrophoresis, and collide (agglomerate) with each other. When the fine particles collide with a droplet, they are taken into the droplet.
- the electrostatic aggregation unit 22 includes a discharge electrode 50 and a ground electrode 52. A predetermined voltage is applied to the discharge electrode 50.
- the ground electrode 52 is a plate-shaped electrode placed facing the discharge electrode 50.
- the ground pole 52 is arranged in such a direction that the direction along the flow direction 30 is the surface thereof. Thereby, the ground electrode 52 can be prevented from becoming a resistance to the flow of exhaust gas.
- the earth electrode 52 is grounded.
- the electrostatic aggregation unit 22 forms an electric field between the discharge electrode 50 and the earth electrode 52 by applying a predetermined voltage to the discharge electrode 50 . Note that the electrostatic aggregation unit 22 only needs to be able to form an electric field between the discharge electrode 50 and the earth electrode 52, and a predetermined voltage may be applied without grounding the earth electrode 52.
- the electrostatic aggregation section 22 is arranged downstream of the nozzle 40, but the present invention is not limited thereto. A portion of the electrostatic aggregation section 22 may be disposed upstream of the nozzle 40. That is, the nozzle 40 may be arranged inside the electrostatic aggregation section 22.
- the electrostatic precipitator 24 is arranged downstream of the electrostatic coagulation section 22 in the circulation flow path 20.
- the electrostatic precipitator 24 collects the particles and droplets by forming an electric field in a region through which the particles and droplets pass.
- the electric precipitator 24 includes a discharge electrode 60 and a ground electrode (dust collection electrode) 62.
- a predetermined voltage is applied to the discharge electrode 60.
- the ground electrode 62 is a plate-shaped electrode placed facing the discharge electrode 60.
- the ground pole 62 is arranged with its surface facing in the direction along the flow direction 30. Thereby, the ground electrode 62 can be prevented from becoming a resistance to the flow of exhaust gas.
- the earth electrode 62 is grounded.
- the distance between the discharge electrode 60 and the earth electrode (dust collection electrode) 62 is shorter than the distance between the discharge electrode 50 and the earth electrode 52 of the electrostatic aggregation section 22 .
- the electric precipitator 24 forms an electric field between the discharge electrode 60 and the earth electrode 62 by applying a predetermined voltage to the discharge electrode 60 .
- the electrostatic precipitator 24 forms an electric field to move particulates and droplets contained in the exhaust gas toward the ground electrode 62, and collects them by making them adhere to the ground electrode 62.
- the electrostatic precipitator 24 only needs to be able to form an electric field between the discharge electrode 60 and the earth electrode 62, and a predetermined voltage may be applied without grounding the earth electrode 62.
- the electrostatic precipitator 24 may include a cleaning device that removes fine particles attached to the ground electrode 62 or a collection device that collects the fine particles by dropping them vertically downward.
- the blower 26 is arranged in the circulation channel 20 on the downstream side of the electrostatic precipitator 24.
- the blower 26 forms a flow from the combustion device 12 toward the electrostatic precipitator 24 and sends the exhaust gas in a flow direction 30 .
- the dust collection system 14 does not need to include the blower 26 when the exhaust gas from the combustion device 12 or the like is discharged at a predetermined flow rate. In other words, the combustion device 12 may satisfy the ventilation function.
- FIGS. 4 and 5 are explanatory diagrams each illustrating the processing of the dust collection system.
- the dust collection system 14 is supplied with exhaust gas containing fine particles.
- the distribution of particles contained in the gas that has flowed into the dust collection system 14 is only a particle distribution 82 corresponding to fine particles, as shown in a particle distribution 70 in FIG. 4 .
- the exhaust gas that has entered the dust collection system 14 moves along the flow direction 30 and is supplied with droplets in the area where the nozzle 40 is located.
- the distribution of particles contained in the gas to which droplets are supplied includes a particle distribution 82 corresponding to fine particles and a droplet distribution 84 corresponding to droplets, as shown in particle distribution 72 in FIG. In other words, droplets and fine particles coexist.
- the fine particles 90 and droplets 92 move through a first region 94 in which an electric field is formed, as shown in FIG. pass.
- the fine particles 90 and the droplets 92 are charged when they pass through the first region 94 where the electrostatic aggregation section 22 is arranged.
- the particle size distribution 74 of the gas that has passed through the electrostatic coagulation unit 22 becomes a fine particle distribution 82a and a droplet distribution 84.
- the fine particle distribution 82a is smaller than the fine particle distribution 82 because the fine particles are integrated with the droplets.
- the gas having the particle size distribution 74 passes through the second region 96 where the electrostatic precipitator 24 is arranged.
- the droplets 92 to which the fine particles 90 are attached, which pass through the second region 96, are moved toward the earth electrode 62 by the electric field formed in the electrostatic precipitator 24, and are moved toward the earth electrode 62. It adheres to the ground electrode 62.
- the dust collection system 14 includes the droplet supply unit 21 and the electrostatic aggregation unit 22 on the upstream side of the electrostatic precipitator 24, and the droplet supply unit 21 supplies droplets to the exhaust gas to generate static electricity.
- the droplets and the fine particles in the electro-agglomerating section 22 can easily collide with each other, and the fine particles can be collected by the droplets.
- the fine particles in the exhaust gas can be collected by collecting the droplets containing the fine particles with the electrostatic precipitator 24.
- the electrostatic precipitator 24 collects the liquid droplets to which no fine particles are attached.
- the electrostatic precipitator 24 can collect droplets that have collected fine particles.
- the dust collection system 14 uses an electrostatic precipitator 24 to collect droplets to which fine particles are attached, thereby making it possible to collect droplets that are easier to move than fine particles in the same electric field, which is more effective than collecting fine particles alone. can also be collected efficiently. Furthermore, since droplets can be collected over a shorter distance than fine particles, the electrostatic precipitator 24 can be made smaller.
- the electrostatic agglomeration unit 22 forms an electric field with a lower electric field strength than that of the electrostatic precipitator 24. Thereby, the electrostatic precipitator 22 can suppress the collection of droplets while bringing the fine particles into contact with the droplets, and the electrostatic precipitator 24 can collect the droplets.
- the distance between the ground electrode and the discharge electrode of the electrostatic aggregation unit 22 be wider than that of the electrostatic precipitator 24. It is preferable that the distance between the ground electrode and the discharge electrode of the electrostatic agglomeration unit 22 is twice or more and three times or less than that of the electrostatic precipitator 24.
- the electrostatic coagulation unit 22 has a smaller potential difference between the ground electrode and the discharge electrode than the electrostatic precipitator 24. It is preferable that the electrostatic aggregation unit 22 has a potential difference between the ground electrode and the discharge electrode of 1/3 or more and 1 or less, more than the electrostatic precipitator 24.
- the electrostatic coagulation unit 22 suppresses the occurrence of discharge via droplets between the earth electrode and the discharge electrode by making the potential difference between the earth electrode and the discharge electrode smaller than that of the electrostatic precipitator 24. Droplets and particles can be charged.
- the electrode interval between the discharge electrode and the earth electrode (the interval in the gas flow direction or the distance in the direction perpendicular to the gas flow direction) is 100 mm or more and 500 mm or less. It is preferable that the electrostatic aggregation part 22 sets the potential difference between the discharge electrode and the earth electrode to 10 kV or more and 50 kV or less. By increasing the distance between the electrodes in the gas flow direction, it is possible to secure the collision time between the particles and the droplets.
- the droplet supply unit 21 has a relationship between the flow rate ⁇ (L/min) of the droplets to be supplied and the gas flow rate ⁇ (m 3 /min) of the circulation channel 30 such that 0.1 ⁇ ( ⁇ / ⁇ ) ⁇ It is preferable to supply droplets satisfying 1.0 to the circulation channel 30. Thereby, the droplets and fine particles can be charged while suppressing the occurrence of abnormal discharge (sparks) via the droplets between the earth electrode and the discharge electrode.
- the electrostatic coagulation unit 22 and the electrostatic precipitator 24 may be arranged inside one housing.
- the electrostatic coagulation unit 22 and the electrostatic precipitator 24 may have a structure in which electrodes that form an electric field are arranged in the flow path 20.
- the dust collection system 14 may provide a predetermined distance between the electrostatic coagulation unit 22 and the electrostatic precipitator 24. Thereby, the fine particles charged in the electrostatic coagulation unit 22 can enter the electrostatic precipitator 24 while being attached to droplets, and the efficiency of collecting fine particles can be further increased.
- the dust collection system 14 of the present embodiment can efficiently move charged droplets and fine particles by collecting dust with the electric dust collector 24, and can efficiently collect fine particles.
- the electrostatic precipitator 24 collects droplets and fine particles, but the dust collection section is not limited to this.
- the dust collection system 14 may use a cyclone-type dust collector that rotates gas in a centrifugal direction and collects droplets using centrifugal force, or may be provided with a mist trap that collects droplets. It may also be a wet type dust collector that supplies droplets, combines them with droplets to which fine particles have adhered, and causes them to fall.
- FIG. 6 is a perspective view showing a schematic configuration of a dust collection system according to another embodiment.
- FIG. 7 is a sectional view showing a schematic configuration of the dust collection system shown in FIG. 6.
- the dust collection system shown in FIGS. 6 and 7 is the same as the dust collection system 14 except for the structure of the electrostatic coagulation unit 22a and the electrostatic precipitator 24a.
- the electrostatic aggregation section 22a has a discharge electrode 50a and a ground electrode 52a.
- the discharge electrode 50a is a rod-shaped electrode.
- the earth electrode 52 is a rod-shaped electrode and is arranged around the discharge electrode 50a.
- the electric dust collector 24a has a discharge electrode 60a and a ground electrode 62a.
- the discharge electrode 60a is a rod-shaped electrode.
- the ground electrode 62 is a rod-shaped electrode and is arranged around the discharge electrode 60a. When a plurality of discharge electrodes 60a are arranged around the ground electrode 62, the earth electrode 62 is arranged at the same distance from each of the plurality of discharge electrodes 60a.
- the ground electrodes 52a and 62a may have a rod-like shape.
- the electrostatic aggregating section 22a charges the droplets and fine particles, and also charges the droplets and the fine particles. By colliding (coagulating), the electrostatic precipitator 24a can easily collect droplets containing fine particles.
- FIG. 8 is a perspective view showing a schematic configuration of a dust collection system according to another embodiment.
- the dust collection system shown in FIG. 8 differs from the dust collection system 14 in a droplet supply section 21a.
- the jetting direction of the nozzle 40a is on the opposite side to the flow direction 30. That is, the nozzle 40a injects droplets toward the upstream side in the flow direction 30.
- the ejected droplets move to the upstream side in the flow direction 30, and then, due to the force of the exhaust gas flowing along the flow direction 30, the traveling direction is reversed and they move along the flow direction 30.
- the dust collection system shown in FIG. 8 arranges the injection port of the nozzle 40a on the upstream side of the flow direction 30, and injects the droplets toward the upstream side of the flow direction 30.
- the moving distance until the particles enter the electrostatic aggregation portion 22 can be made longer.
- the droplets supplied from the droplet supply section 21a can enter the electrostatic aggregation section 22 in a more dispersed state.
- the dispersed droplets enter the electrostatic coagulation section 22 the fine particles and the droplets can be brought into close contact with each other.
- the droplets can still travel the distance required for dispersion, so the size of the dust collection system in the flow direction 30 can be shortened. At the same time, the performance of collecting fine particles can be improved.
- FIG. 9 is a perspective view showing a schematic configuration of a dust collection system according to another embodiment.
- the dust collection system shown in FIG. 9 differs from the dust collection system 14 in a droplet supply section 21b.
- the droplet supply unit 21b of the dust collection system shown in FIG. 9 includes a rectification mechanism 202 in addition to each part of the droplet supply unit 21.
- the rectifying mechanism 202 is arranged between the nozzle 40 and the electrostatic aggregation section 22.
- the rectifying mechanism 202 is a plate-shaped mesh in which openings through which droplets and fine particles pass are regularly formed, so-called a plate-shaped mesh.
- a mesh with an aperture ratio of 0.5 can be used for the rectifying mechanism 202.
- the rectifying mechanism 202 has a mesh aperture ratio of 0.2 or more and 0.6 or less.
- the droplet supply section 21b arranges a rectifying mechanism 202 in which openings are regularly formed between the nozzle 40 and the electrostatic aggregation section 22, thereby separating the droplets ejected from the nozzle 40 and the exhaust gas. It is possible to rectify the flow of particles and make it easier for particles to collide with droplets.
- the rectifying mechanism 202 can restrict the area through which droplets and particles can pass to the opening of the rectifying mechanism 202 . This allows the droplets to be in the vicinity of the particles when they pass through the opening, making it easier for the particles to collide with the droplets. Further, by uniformly spreading the droplets on the mesh surface, the droplets can be dispersed over a wide range of the 202 surfaces. As a result, droplets and fine particles can be brought into contact over a wider range.
- the rectifying mechanism 202 is not limited to a mesh-shaped plate, but can have various shapes capable of regulating the movement of droplets and fine particles ejected from the nozzle 40 and promoting the attachment of fine particles to the droplets.
- the flow straightening mechanism 202 may have a structure in which cylindrical channels are arranged in a two-dimensional array, that is, a structure in which a thick mesh is arranged. Further, the rectifying mechanism 202 may include a plurality of stages of rectifying mechanisms.
- FIG. 10 is a perspective view showing a schematic configuration of a dust collection system according to another embodiment.
- the dust collection system shown in FIG. 10 differs from the dust collection system 14 in a droplet supply section 21c.
- nozzles 40 are arranged in a grid pattern.
- the droplet supply section 21c has, for example, 60 nozzles 40 arranged per 1 m2 .
- the droplet supply section 21c can reduce the area in which droplets are ejected by one nozzle 40, and the ejected droplets can be spread within a predetermined range.
- the required distance distance in the flow direction 30
- the ejected droplets can be easily decelerated, and can be decelerated to the same flow velocity as fine particles over a short distance. Thereby, it is possible to easily bring the fine particles into contact with the liquid droplets, and the fine particles can be more reliably collected by the liquid droplets.
- a matrix arrangement is used in which the elements are arranged in rows in the two-dimensional direction, but a houndstooth arrangement may be used. Also.
- the droplet supply units 21c may be arranged in a two-dimensional arrangement when viewed from the flow direction 30, or may be arranged so that their positions in the flow direction 30 are shifted.
- an electrostatic agglomeration section that forms a gas, charges the fine particles and the liquid droplets contained in the gas, and causes the fine particles and the droplets to collide;
- a dust collection system including a dust collection unit that collects droplets and the fine particles.
- the dust collecting section is an electrostatic precipitator that has a discharge electrode and a ground electrode, forms an electric field between the discharge electrode and the ground electrode, and causes the droplets and fine particles to adhere to the ground electrode.
- the dust collection system according to (1) (3) The dust collection system according to (2), wherein the electrostatic aggregation section forms an electric field with a lower electric field strength than the dust collection section. (4) The dust collection system according to (3), in which the voltage applied to the electrostatic agglomeration section is lower than that of the dust collection section. (5) The dust collection system according to (3) or (4), wherein the electrostatic aggregation section has a discharge electrode and a ground electrode, and the distance between the discharge electrode and the ground electrode is wider than that of the dust collection section. (6) The dust collection system according to any one of (2) to (5), wherein the ground electrode is a plate-shaped electrode. (7) The dust collection system according to any one of (2) to (5), wherein the ground electrode is a rod-shaped electrode.
- the droplet supply unit has a relationship between a flow rate ⁇ (L/min) of the droplets to be supplied and a gas flow rate ⁇ (m 3 /min) of the circulation channel of 0.1 ( ⁇ / ⁇ ).
- the dust collection system according to any one of (1) to (7), wherein droplets satisfying ) ⁇ 1.0 are supplied to the circulation channel.
- the dust collection system according to any one of (1) to (8), wherein the droplet supply unit injects the droplets upstream.
- the droplet supply unit is a collection unit according to any one of (1) to (9), wherein the injection ports for ejecting the droplets are arranged in a grid pattern on a surface perpendicular to the flow direction of the gas. dust system.
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- Electrostatic Separation (AREA)
Abstract
Description
(1)ガスが流通する流通経路と、前記流通経路に液滴を供給する液滴供給部と、前記液滴の供給位置よりも下流側の流通経路に配置され、前記ガスの流路に電界を形成し、前記ガスに含まれる微粒子及び前記液滴を帯電させ、微粒子と液滴とを衝突させる静電凝集部と、前記静電凝集部よりも下流側の流通経路に配置され、前記液滴と前記微粒子を捕集する集塵部と、を含む集塵システム。
(2)前記集塵部は、放電極とアース極とを有し、前記放電極と前記アース極との間に電界を形成し、前記アース極に前記液滴及び前記微粒子を付着させる電気集塵機である(1)に記載の集塵システム。
(3)前記静電凝集部は、前記集塵部よりも電界強度が低い電界を形成する(2)に記載の集塵システム。
(4)前記静電凝集部は、前記集塵部よりも印加される電圧が小さい(3)に記載の集塵システム。
(5)前記静電凝集部は、放電極とアース極とを有し、前記集塵部よりも放電極とアース極との距離が広い(3)または(4)に記載の集塵システム。
(6)前記アース極は、板状の電極である(2)から(5)のいずれかに記載の集塵システム。
(7)前記アース極は、棒状の電極である(2)から(5)のいずれかに記載の集塵システム。
(8)前記液滴供給部は、供給する液滴の流量α(L/分)と、前記流通流路のガス流量β(m3/分)との関係が、0.1(α/β)≦1.0を満足する液滴を前記流通流路に供給する(1)から(7)のいずれかに記載の集塵システム。
(9)前記液滴供給部は、前記液滴を上流側に噴射する(1)から(8)のいずれかに記載の集塵システム。
(10)前記液滴供給部は、前記液滴を噴射する噴射口が、前記ガスの流れ方向に直交する面に格子状に配列される(1)から(9)のいずれかに記載の集塵システム。
(11)前記液滴供給部は、前記液滴を噴射する噴射位置の下流側に、メッシュ形状の整流機構を備える(1)から(10)のいずれかに記載の集塵システム。
(12)ガスが流通する流通経路に液滴を供給するステップと、前記液滴の供給位置よりも下流側の流通経路に電界を形成し、前記ガスに含まれる微粒子及び前記液滴を帯電させるステップと、微粒子と液滴とを衝突させるステップと、前記微粒子及び前記液滴を帯電させる位置よりも下流側の流通経路で、前記液滴と前記微粒子を捕集するステップと、を含む集塵方法。
12 燃焼装置
14 集塵システム
20 流通経路
21 液滴供給部
22 静電凝集部
24 電気集塵機(集塵部)
26 送風機
30 流通方向
40 ノズル
50、60 放電極
52、62 アース極
70、72、74 粒子分布
82、82a 微粒子分布
84 液滴分布
90 微粒子
92 液滴
94 第1領域
96 第2領域
Claims (12)
- ガスが流通する流通経路と、
前記流通経路に液滴を供給する液滴供給部と、
前記液滴の供給位置よりも下流側の流通経路に配置され、前記ガスの流路に電界を形成し、前記ガスに含まれる微粒子及び前記液滴を帯電させ、微粒子と液滴とを衝突させる静電凝集部と、
前記静電凝集部よりも下流側の流通経路に配置され、前記液滴と前記微粒子を捕集する集塵部と、を含む集塵システム。 - 前記集塵部は、放電極とアース極とを有し、前記放電極と前記アース極との間に電界を形成し、前記アース極に前記液滴及び前記微粒子を付着させる電気集塵機である請求項1に記載の集塵システム。
- 前記静電凝集部は、前記集塵部よりも電界強度が低い電界を形成する請求項2に記載の集塵システム。
- 前記静電凝集部は、前記集塵部よりも印加される電圧が小さい請求項3に記載の集塵システム。
- 前記静電凝集部は、放電極とアース極とを有し、前記集塵部よりも放電極とアース極との距離が広い請求項3に記載の集塵システム。
- 前記アース極は、板状の電極である請求項2に記載の集塵システム。
- 前記アース極は、棒状の電極である請求項2に記載の集塵システム。
- 前記液滴供給部は、供給する液滴の流量α(L/分)と、前記流通流路のガス流量β(m3/分)との関係が、0.1(α/β)≦1.0を満足する液滴を前記流通流路に供給する請求項1に記載の集塵システム。
- 前記液滴供給部は、前記液滴を上流側に噴射する請求項1に記載の集塵システム。
- 前記液滴供給部は、前記液滴を噴射する噴射口が、前記ガスの流れ方向に直交する面に格子状に配列される請求項1に記載の集塵システム。
- 前記液滴供給部は、前記液滴を噴射する噴射位置の下流側に、メッシュ形状の整流機構を備える請求項1から請求項10のいずれか一項に記載の集塵システム。
- ガスが流通する流通経路に液滴を供給するステップと、
前記液滴の供給位置よりも下流側の流通経路に電界を形成し、前記ガスに含まれる微粒子及び前記液滴を帯電させるステップと、微粒子と液滴とを衝突させるステップと、
前記微粒子及び前記液滴を帯電させる位置よりも下流側の流通経路で、前記液滴と前記微粒子を捕集するステップと、を含む集塵方法。
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| EP23788084.4A EP4438183A4 (en) | 2022-04-15 | 2023-03-09 | Dust collection system and dust collection method |
| US18/724,358 US20250256289A1 (en) | 2022-04-15 | 2023-03-09 | Dust collection system and dust collection method |
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| WO2011108324A1 (ja) | 2010-03-02 | 2011-09-09 | 三菱重工業株式会社 | 仕上げ排煙脱硫装置及びこれを用いた排ガス処理システム |
| WO2016153046A1 (ja) | 2015-03-26 | 2016-09-29 | 住友金属鉱山エンジニアリング株式会社 | 電気集塵装置用の重金属除去支援装置 |
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| JP3572164B2 (ja) * | 1996-05-23 | 2004-09-29 | 三菱重工業株式会社 | 除塵装置 |
| SE530738C2 (sv) * | 2006-06-07 | 2008-08-26 | Alstom Technology Ltd | Våtelfilter samt sätt att rengöra en utfällningselektrod |
| KR100929905B1 (ko) * | 2007-12-10 | 2009-12-04 | 한국기계연구원 | 양극성 복합 정전유전체 응집 방식 미세입자 포집장치 |
| EP2849888B1 (en) * | 2012-05-15 | 2021-05-12 | University Of Washington Through Its Center For Commercialization | Electronic air cleaner and method |
| JP6804234B2 (ja) * | 2016-08-24 | 2020-12-23 | 三菱パワー環境ソリューション株式会社 | 粒子除去装置 |
| CN110404682A (zh) * | 2019-09-02 | 2019-11-05 | 宁夏马连富电力科技有限公司 | 滴液集尘电除尘器 |
| CN111632760A (zh) * | 2020-05-19 | 2020-09-08 | 浙江菲达环保科技股份有限公司 | 一种基于荷电水雾相变强化so3团聚脱除的装置 |
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| WO2011108324A1 (ja) | 2010-03-02 | 2011-09-09 | 三菱重工業株式会社 | 仕上げ排煙脱硫装置及びこれを用いた排ガス処理システム |
| WO2016153046A1 (ja) | 2015-03-26 | 2016-09-29 | 住友金属鉱山エンジニアリング株式会社 | 電気集塵装置用の重金属除去支援装置 |
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| TWI854543B (zh) | 2024-09-01 |
| EP4438183A1 (en) | 2024-10-02 |
| TW202344309A (zh) | 2023-11-16 |
| US20250256289A1 (en) | 2025-08-14 |
| EP4438183A4 (en) | 2025-04-23 |
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