JP2020195954A - Electric dust collector - Google Patents

Abstract

To provide an electric dust collector of which down-sizing is realized to easily ensure an installation space and which has an excellent volume efficiency, even if the collector is an electric dust collector for exhaust gas treatment for a large displacement diesel engine.SOLUTION: An electric dust collector comprises a dost collection part with an electrostatic built-in in electric dust collection mechanism, which comprises a discharge electrode and a dust collecting electrode, in the wake of an introduction pipe. In this dust collector, a collection pipe, of which an inner surface is so made as to be a collection wall surface, is configured from a rectangular cylindrical body, four flat wall surfaces of the rectangular cylindrical body are so made as to be the dust collection electrode, and the discharge electrode is located while maintaining a discharge interval between itself and the dust collection electrode.SELECTED DRAWING: Figure 1

Description

According to the present invention, exhaust gas from diesel engines for ships, power generation, industrial use, etc., indoor dust, boilers, incinerators, welding devices, brazing devices, painting devices, welding / brazing / painting, etc. are implemented. Polluted gas containing exhaust gas, fume, dust, etc. emitted from tunnels of factories, highways, vehicle roads, etc. (The polluted gas contains fine particles, and these fine particles have a particle size. The smaller it is, the easier it is to float. For example, PM10 (particle size 10 μm or less) is known as a suspended particulate matter, and the PM (granular substance), dust, etc. in PM10 (granular substance) in the atmosphere and hardly falls to the ground surface by gravity. It is related to an electrostatic precipitator that uses corona discharge to remove dust such as fume and dust, and more specifically, pollutant gas containing PM, indoor dust, flue gas, fume, dust, etc. in diesel engine exhaust gas. The present invention relates to an electrostatic precipitator provided with a dust collector having a built-in electrostatic precipitator (hereinafter, referred to as “ESP” for convenience of explanation) composed of a discharge electrode and a dust collection electrode in the wake of the introduction pipe.

As a method for electrostatically treating dust such as PM, soot, fume, and dust in diesel engine exhaust gas by using corona discharge, for example, Patent Documents 1 and 2 previously proposed by the present applicant are known. There is.
That is, in Patent Document 1, as the outline is shown in FIG. 10, the discharge electrode 101-2 for charging the granular substance contained in the exhaust gas of the large exhaust gas diesel engine using low quality fuel of heavy oil or less, and the charging The discharge electrode 101-2 has a tubular collecting portion 101 having a predetermined length that constitutes a dust collecting electrode for collecting the granular substances, and the discharge electrode 101-2 is a collecting pipe 101- that constitutes the tubular collecting portion 101. An electrostatic dust collecting means composed of a main electrode 101-2a arranged in 1 in the direction of the tube axis and a plurality of radially protruding electrode needles 101-2b spaced apart from the main electrode, and the above. In an exhaust gas treatment device for a diesel engine provided with a cyclone-type separate collection means 102 that separates and collects granular substances separated from the tubular collection unit 101, the granular material is granular near the axis on the downstream side of the tubular collection unit 101. The low-concentration exhaust gas outlet pipe 103 for the substance is provided with the high-concentration exhaust gas lead-out section 101-1b near the inner peripheral surface on the downstream side of the tubular collection section, and the granular material high-concentration exhaust gas lead-out section 101-1b is provided with the granular substance. Cyclone collecting means 102-1 for collecting substances is continuously provided, and the cyclone collecting means is composed of tangent cyclone 102-1a, and the opening degree of the damper 107 arranged in the low-concentration exhaust gas outlet pipe 103. When the length of the collection pipe 101-1 is L and the inner diameter of the collection pipe is D, there is no mechanism for controlling the exhaust gas inflow speed into the tangent cyclone 102-1a by controlling. An exhaust gas treatment device for a large-emission diesel engine using a low-quality fuel of heavy oil or less, characterized in that the relationship satisfies the condition of 5D ≦ L ≦ 15D, has been proposed.

Further, in Patent Document 2, for example, as shown in outline in FIG. 11, a granular substance contained in the exhaust gas of a diesel engine using heavy oil in a tubular precipitator portion composed of a main precipitator pipe 201 having a predetermined length. A tubular collecting portion 201-of a predetermined length constituting the discharge electrodes 211-1A-1, 201-2A-1, 201-3A-1, and the dust collecting electrode for collecting the charged granular substances. The discharge electrode has 1, 201-2, and 201-3, and the discharge electrode is composed of a main electrode 202 arranged in a tubular precipitator in the tube axis direction and a radially protruding electrode arranged on the main electrode. Tubular collectors 21-1, 201-2, 2013-3, which are provided with the configured electrostatic precipitator and are composed of the discharge electrode and the main precipitator having a single diameter and a predetermined length. A discharge electrode of a diesel engine exhaust gas treatment device in which tubular precipitators that are short in the axial direction and have different diameters are arranged in a plurality of stages, and that is an at least one tubular precipitator of the tubular precipitator arranged in the plurality of stages. The discharge electrode support cylinder 211-1A- is concentric with the concentric main electrode to which the discharge electrode is attached to the outer periphery of the main electrode 202 via stays 201-1A-1e, 201-2A-1e, 201-3A-1e. 1d, 201-2A-1d, 201-3A-1d and short discharge electrode needles 2011-1A-arranged radially on the surface of the discharge electrode support cylinder at desired intervals in the circumferential direction and the tube axis direction. It is composed of 1c, 201-2A-1c, 201-3A-1c or a low-height saw-blade discharge electrode plate, and the radial length of the short discharge electrode needle or the low-height saw-blade discharge electrode plate. The distance between the tip of the discharge electrode needle or the low-height saw blade-shaped discharge electrode plate and the collection wall surface is 30 to 70 mm, and the most upstream tubular collection module of the tubular collection portion is described. For treating exhaust gas from a diesel engine, the upstream opening end of the discharge electrode support cylinder is closed by conical lid portions 211-1A-1d', 201-2A-1d', 201-3A-1d'. A discharge electrode for an electrostatic precipitator has been proposed by the applicant.

Patent No. 5863087 JP-A-2017-952

However, the above-mentioned conventional electrostatic precipitator has the following problems.
That is, in the exhaust gas treatment apparatus for a large-diameter diesel engine that uses low-quality fuel less than heavy oil described in Patent Documents 1 and 2, the tubular collecting portions 101, 201-1, 201-2, 201- The collection pipe having the inner surface constituting 3 as the collection wall surface requires a long length having a circular cross section and a ratio of the length L to the inner diameter D of L = 5D to 15D, and the tubular collection. Since the cross section of the part is circular, the area efficiency of the cross section is lower than that of the rectangular (square) cross section (comparing the rectangular (square) cross section with the side length D and the circular cross section with the diameter D D ² : 1/4 · πD ² and "1/4 · π ≈ 0.7853", that is, the area equivalent to about 21% is small), so the dust collector using a collecting pipe with a circular cross section is long and has a large diameter. It had to be a large-scale device, and there was a problem that it was difficult to secure an installation space when installing the dust collector.

The present invention has been made to solve the above-mentioned problems of the prior art, and in particular, an introduction pipe into which polluted gas containing dust such as PM, indoor dust, flue gas, fume, and dust in diesel engine exhaust gas flows in. An electrostatic precipitator equipped with a dust collector having a built-in electrostatic electrostatic precipitator composed of a discharge electrode and a dust collection electrode in the wake, and the inner surface constituting the tubular precipitator is a collection wall surface. By adopting a rectangular precipitator instead of the conventional circular precipitator, we have realized a miniaturization of the device and proposed an electrostatic precipitator with excellent volume efficiency in the installation space. It is something to try.

The first electrostatic precipitator according to the present invention has a discharge electrode and a precipitator in the wake of an introduction pipe into which polluted gas containing dust such as PM, indoor dust, flue gas, fume, and dust in the diesel engine exhaust gas flows. In an electrostatic precipitator provided with a dust collector having a built-in electrostatic electrostatic precipitator composed of dust electrodes, the dust collector includes the discharge electrode and the dust collecting electrode and is perpendicular to the flow direction of polluted gas. It has at least one rectangular tubular body having a rectangular cross section and a predetermined length in the flow direction of pollutant gas, and the four flat wall surfaces of the rectangular tubular body are used as dust collecting electrodes and the dust collecting electrodes. The discharge electrodes are arranged near the center of the rectangular tubular body while maintaining the discharge intervals at predetermined intervals in the flow direction of the polluted gas and in the direction perpendicular to the flow, and flow along the dust collecting electrodes. A high-concentration polluted gas outlet that collects and discharges a high-concentration polluted gas flow that contains dust and the like in a high concentration, and a low-concentration polluted gas flow that collects and discharges a low-concentration polluted gas flow that collects and discharges dust and the like flowing along the discharge electrode. The low-concentration polluted gas lead-out section is provided at the rear portion of the rectangular tubular body, and the high-concentration polluted gas lead-out pipe is provided in the wake of the high-concentration pollutant gas lead-out section. A low concentration dust collector is provided in the stream to remove dust and the like from the high-concentration exhaust gas stream, and a discharge pipe is provided in the wake of the separate dust collector, and is arranged in the wake of the low-concentration polluted gas outlet. It is characterized in that a low-concentration polluted gas is discharged as a discharge gas flow from a high-concentration polluted gas outlet pipe.
The dust collecting portion in the first electrostatic precipitator is composed of a module composed of a group of tubular bodies in which a plurality of the rectangular tubular bodies are laminated in parallel, and each of the rectangular tubular bodies has the high concentration pollution. It is a preferred embodiment that the gas outlet and the low-concentration polluted gas outlet are arranged in a collecting pipe shape.

Further, the second electrostatic precipitator according to the present invention has a discharge electrode and a discharge electrode in the wake of the introduction pipe into which polluted gas containing dust such as diesel engine exhaust gas, PM, indoor dust, smoke exhaust, fume, and dust flows. In an electrostatic precipitator provided with a plurality of dust collectors having a built-in electrostatic electrostatic precipitator composed of dust collecting electrodes, each dust collecting unit has the discharge electrode and the dust collecting electrode built-in and the flow direction of polluted gas. At least one rectangular tubular body having a rectangular cross section perpendicular to and having a desired length in the pollutant gas flow direction is arranged in a plurality of stages in the pollutant gas flow direction, and the flat 4 of the rectangular tubular body is arranged. The wall surface is used as a dust collecting electrode, and the discharge interval is maintained with the dust collecting electrode, and the discharge electrode is held near the center of the rectangular tubular body at predetermined intervals in the flow direction of the polluted gas and in the direction perpendicular to the flow. A high-concentration polluted gas outlet that collects and discharges a high-concentration polluted gas flow containing a high concentration of dust and the like flowing along the dust collecting electrode, and a low dust and the like flowing along the discharge electrode. A low-concentration polluted gas outlet that collects and discharges a low-concentration polluted gas flow contained in the concentration is provided at the rear of the rectangular tubular body, and a high-concentration polluted gas outlet pipe is provided at the wake of the high-concentration polluted gas outlet. The high-concentration polluted gas outlet pipe is provided with a separate dust collector having a discharge pipe so as to remove dust and the like from the high-concentration polluted gas flow and release the low-concentration polluted gas. The lead-out unit is connected to the dust collector having a rectangular tubular body in the latter stage for repurification treatment or connected to the low-concentration polluted gas lead-out pipe to discharge the low-concentration polluted gas flow as a discharge gas flow. It is a feature.
Each of the dust collecting portions in the second electrostatic precipitator is composed of a module composed of a group of tubular bodies in which a plurality of the rectangular tubular bodies are laminated in parallel, and each of the rectangular tubular bodies has the high concentration. It is a preferred embodiment that the pollutant gas lead-out portion and the low-concentration pollutant gas lead-out portion are arranged in a collecting pipe shape.

In the electrostatic precipitator according to the present invention, dust and the like are basically collected by an electrostatic precipitator mounted on a dust collecting unit in the same manner as the electrostatic precipitator of Patent Document 2. The problems of the prior art and the effects of the present invention will be described below with reference to FIGS. 8a, 8b, 9a and 9b. The following (a), (b1), and (b2) correspond to FIGS. 8a and 8b.

(I). As shown in FIG. 8a, the electrostatic precipitator according to the present invention has a rectangular cross section of the dust collecting portion, so that there is wasted space existing at the four corners of the rectangle as compared with the conventional ESP having a circular cross section. There is no (dead space that does not contribute to collection), and the area efficiency of the rectangular cross section is excellent by about 21% as described in paragraph 0005, and as a result, the volume efficiency in the installation space is excellent.

(B-1). In the conventional circular cross-section ESP, corona discharge to dust passing outside the cylindrical collection wall of collection tubes (small diameter collection tube to large diameter collection tube) + Coulomb force generation + collection surface Although there was a wasted space in which adhesion could not be generated, the rectangular cross-section ESP of the present invention does not have this wasted space, so that the volume efficiency in the installation space is excellent.

(B-2). In the circular cross-section ESP of the prior art, there is a wasted space in which corona discharge + Coulomb force generation + collection surface adhesion cannot be generated to the dust passing through the inner surface side of the cylindrical discharge electrode support cylinder. Since this wasted space does not exist in the rectangular cross-section ESP of the above, the volume efficiency in the installation space is excellent.

(C). In addition, the main dimensions of the device in which the rectangular cross-section ESPs of the present invention are connected in series in a plurality of stages (corresponding to Examples 2, FIGS. 4 and 5) and the device of the prior art circular cross-section ESP (corresponding to FIG. 11) are shown. Shown and quantitatively compare the effects of the present invention.
First, the effect on the dust collection efficiency when a plurality of rectangular cross-section ESPs are connected in series is shown. FIG. 6 shows a schematic explanatory view of a dust collector in which rectangular cross-section ESPs are connected in series, for example, in three stages, and FIG. 7 shows the dust collection efficiency.

Dust collection rate when multiple stages of rectangular cross-section ESPs are connected in series <Verification conditions>
Dust collection rate η (%); 50%, 60%, 70%
Total dust collection rate; ηT (%) [ηT = 1- (1-η) n]
Number of connecting stages n; 3 stages <Result>
(1). The total dust collection rate is 88% when the dust collection parts with a dust collection rate of 50% are connected in series in three stages.
(2). The total dust collection rate is 94% when the dust collection parts with a dust collection rate of 60% are connected in series in three stages.
(3). Total dust collection efficiency of 98% when three stages of dust collection parts with a dust collection rate of 70% are connected in series.

From the above results, it is clear that the total dust collection rate increases as described above when the rectangular cross-section ESPs are connected in multiple stages. Therefore, in practical equipment, from the viewpoint of the scale, manufacturing, installation, operation, etc. of the dust collector, the length of each ESP is shortened and the total dust collection is performed by connecting multiple short ESPs. It is practical to improve the rate.

(D). A conceptual comparison of the sizes of ESPs of the present invention and the prior art is shown below.
8a and 8b are conceptual explanatory views showing that there is wasted space in the circular cross-section ESP of the prior art (Patent Document 2) as described above, and FIGS. 9a and 9b are the rectangular cross-section ESP of the present invention. It is a conceptual explanatory view of the dimension of 1 module of. Comparing both figures, it can be seen that the wasted space is reduced in the rectangular cross-section ESP.
Regarding the superiority of the present invention, the verification results of Examples 1 and 2 are shown in [Example Verification Results] described later, and the rectangular cross-section ESP of the present invention is significantly larger than the circular cross-section ESP of the prior art. It details that the miniaturization can be achieved. When the ESP is installed in a limited space such as a ship, the rectangular cross-section ESP of the present invention is particularly effective.

(E). The rectangular precipitator ESP of the electrostatic precipitator according to the present invention corresponds to a collecting portion having a rectangular cross section in which a plurality of rectangular tubular bodies made of rectangular dust collecting electrodes are laminated, and a electrode support rod corresponding to the rectangular tubular body. Since the dust collecting part of the ESP, which is the main part of the electrostatic precipitator, can be easily assembled by inserting the discharge electrodes arranged in the above direction, the assembly workability is excellent and the manufacturing cost of the electrostatic precipitator is reduced. It can also be reduced.

It is a schematic vertical sectional view which shows the main part of the whole structure of the 1st Example apparatus of this invention. FIG. 1 is an enlarged vertical sectional view taken along the line AA. FIG. 1 is an enlarged vertical cross-sectional view taken along the line BB. It is a schematic vertical sectional view which shows the main part of the whole structure of the 2nd Example apparatus of this invention. FIG. 4 is an enlarged vertical sectional view taken along the line CC. It is a schematic explanatory drawing which shows the electric dust collector which connected three stages of ESP in series as an Example by ESP of this invention. It is a figure which shows the calculation example of the dust collection rate of the electric dust collector shown in FIG. It is a schematic side view which shows the concept of the conventional circular cross-section electrostatic precipitator. It is a schematic shaft sectional view which shows the concept of the conventional circular sectional electric dust collector. It is a schematic side which shows the concept of the electrostatic precipitator of the rectangular cross section of this invention. It is a schematic shaft sectional view which shows the concept of the electrostatic precipitator of the rectangular cross section of this invention. It is the schematic which shows an example of the conventional electrostatic precipitator. It is the schematic which shows another example of the conventional electrostatic precipitator.

I. First Example device (ESP 1-stage system):
The first embodiment device of the present invention shown in FIGS. 1 to 3 includes exhaust gas of diesel engines for ships, power generation, industrial use, etc., indoor dust and boilers, incinerators, welding devices, brazing devices, and coating. Removes dust such as soot and dust in polluted gas containing smoke, fume, dust, etc. emitted from equipment, factories where welding, brazing, painting, etc. are performed, tunnels on highways and vehicle roads, etc. The dust collecting mechanism is the same as that of Patent Documents 1 and 2 (the dust collecting mechanism is the same as that of Patent Documents 1 and 2), and the structure of the electrostatic precipitator 1 is a joint pipe 1-continuously connected to the introduction pipe 1-1 into which the polluted gas flows. Nine rectangles with built-in discharge electrodes 2-5 and dust collection electrodes 2-6 that are supplied with high-pressure power supply controlled by an externally installed high-pressure power supply device (not shown) in the wake of 2. A dust collecting unit 1-3 in which a module consisting of a shell group of a tubular body (hereinafter, referred to as a “rectangular shell” for convenience of explanation) 4-1 to 4-9 has one stage of ESP2 is arranged.

The dust collecting portions 1-3 are provided with a high-concentration polluted gas flow G-3 discharged along the dust collecting electrodes 2-6 forming the inner peripheral surfaces of the rectangular shells 4-1 to 4-9. In order to remove dust and PM such as the soot and dust contained therein, high-concentration polluted gas out-licensing units 1-4 in the form of collective pipes are continuously provided, and each of the high-concentration polluted gas out-licensing units 1-4 is provided. The high-concentration polluted gas flow G-3 is supplied to the cyclone 3-1 of the separated dust collecting unit 3 via the assembled high-concentration polluted gas outlet pipe 1-6, and the high-concentration polluted gas flow. Dust and PM such as soot and dust contained in G-3 are separated and removed with high efficiency by applying kinetic energy with a blower 3-3, and cyclone polluted gas flow G from the discharge pipe 3-2. As -4, it is configured to be discharged to the outlet pipe 1-9 described later.

On the other hand, a plurality of discharge electrodes 2-5 are arranged in the vicinity of the center of each of the rectangular shells 4-1 to 4-9 at desired intervals in the flow direction of the polluted gas and in the direction perpendicular to the flow. The low-concentration polluted gas flow G-2 discharged along the line includes a low-concentration polluted gas lead-out pipe 1-7 in which a low-concentration pollutant gas lead-out portion 1-5 in the form of a collecting pipe is provided and aggregated at the rear portion thereof, and the above-mentioned low-concentration polluted gas lead-out pipe 1-7. A clean discharge gas flow in which dust such as soot and dust and PM are collected and removed from the outlet pipe 1-9 via the gradually reducing diameter joint pipe 1-8 connected to the rear of the low-concentration polluted gas outlet pipe. It is configured to become G-5 and be released into the atmosphere or the like.

Further, as shown in FIG. 2, the dust collecting unit 1-3 is composed of each rectangular shell 4-1 to 4-9 having a discharge electrode 2-5 and a dust collecting electrode 2-6 each constituting the ESP2. The distance between the discharge electrode 2-5 and the dust collecting electrode 2-6 constituting each of the rectangular shells 4-1 to 4-9 is not particularly limited, but about 50 mm is used for each of the rectangular shells. The distance between the dust collecting electrodes 2-6 constituting the shells 4-1 to 4-9 and the inner surface of the high-concentration polluted gas leading-out unit 1-4 is preferably about 10 mm.

Further, on the upstream side of the dust collecting portion 1-3, as shown in FIG. 1, a large number of electrode stays 2-3 are interposed on the electrode support rods 2-2 vertically provided on the seal air introduction pipe portion 2-1. A large number of electrode holders 2-4 are attached, and each of the discharge electrodes 2-5 incorporated in each of the rectangular shells 4-1 to 4-9 by the electrode holder 2-4 is attached to the pollutant gas flow direction and the said. Multiple are provided in the direction perpendicular to the flow. Further, the discharge electrode 2-5 is made of a linear wire, a triangular or saw blade-shaped plate material, etc. in the polluted gas, so that the flow resistance to the polluted gas flow is reduced as much as possible. A metal structure having a large number of protruding shapes can be used.

It should be noted that the seal air introduction pipes 2-1 provided with the seal air introduction pipes 2-1 on both the upstream and downstream sides of the polluted gas of the dust collection parts 1-3 and the dust collection electrodes 2-6 on both sides are provided. A structure may be formed in which the discharge electrode is held through and held in both directions. Further, here, a module composed of a group of rectangular shells in which nine rectangular shells are laminated is illustrated, but it goes without saying that the module may be composed of a single shell. Further, a configuration example of a vertically long rectangular cross-sectional shape in which each rectangular shell is arranged in parallel with the vertically elongated electrode support rod 2-2 is shown, but a horizontally long rectangular shape arranged orthogonally to the electrode support rod 2-2 is shown. It may have a cross-sectional shape, and it goes without saying that the arrangement direction of the rectangular shell does not matter.

II. Second Example Device (ESPN Stage Method):
Similar to the device of the first embodiment, the exhaust gas of diesel engines for ships, power generation, industrial use, etc., indoor dust and boilers, incinerators, welding devices, brazing devices, coating devices, welding / brazing, etc. A book using corona discharge that removes dust such as soot and dust in polluted gas containing smoke, fume, dust, etc. emitted from factories where painting is performed, tunnels on highways and vehicle roads, etc. As shown in FIGS. 4 and 5, the apparatus of the second embodiment of the present invention is controlled by being wired to an externally installed high-voltage power supply device in the wake of the joint pipe connected to the introduction pipe into which the polluted gas flow flows. A module consisting of a group of nine first rectangular shells 14-1a to 14-9a incorporating a discharge electrode 12-5a and a dust collection electrode 12-6a, which are supplied with a high-voltage power supply, is the first stage ESP12a. A module consisting of a shell group of nine second rectangular shells 14-1b to 14-9b containing a dust collecting unit 11-3a, a discharge electrode 12-5b, and a dust collecting electrode 12-6b is in the second stage. The nth stage is a module consisting of a group of n first rectangular shells 14-1n to 14-9n containing an ESP12b built-in dust collecting unit 11-3b, a discharge electrode 12-5n and a dust collecting electrode 12-6n. The dust collecting units 11-3n containing the ESP12n of the above are arranged in series.

The high-concentration polluted gas flow G-13a discharged into the dust collecting portion 11-3a along the dust collecting electrode 12-6a forming the inner peripheral surface of the first rectangular shells 14-1a to 14-9a. In order to remove dust and PM such as soot and dust contained in the above, a high-concentration polluted gas lead-out pipe 11 in which a high-concentration pollutant gas lead-out portion 11-4a in the form of a collecting pipe is provided and aggregated at the rear portion respectively. The high-concentration polluted gas flow G-13a is configured to be supplied to a cyclone of a separate dust collector (not shown) via -6, and the cyclone moves dust such as soot and dust and PM with a blower. It is configured to apply energy to separate and remove dust with high efficiency and discharge it to a discharge pipe (not shown).

On the other hand, the discharge electrodes 12- are arranged in the vicinity of the center of each of the first rectangular shells 14-1a to 14-9a at desired intervals in the flow direction of the polluted gas and in the direction perpendicular to the flow. The second-stage dust collecting section 11-3b into which the low-concentration polluted gas flow G-12a discharged along 5a flows in is provided with a collecting pipe-shaped low-concentration polluted gas lead-out section 11-5a at the rear thereof. In the dust collecting section 11-3b, the flow rate of the polluted gas is reduced due to the outflow of the high-concentration polluted gas G-13a, but each of the first-stage modules is the first-stage module. 1 The number of shells is the same as that of the rectangular shells 14-1a to 14-9a, and the shell group of the second rectangular shells 14-1b to 14-9b, which is the second stage module, is built in.

In the second rectangular shells 14-1b to 14-9b, the high-concentration polluted gas flow G-13b flowing along the dust collecting electrodes 12-6b forming the inner peripheral surface is discharged, so that the low concentration is like a collecting pipe. The concentration polluted gas lead-out section 11-4b is provided at the rear portion and is configured to flow into the high-concentration pollutant gas lead-out pipe 11-6, and the center of each of the second rectangular shells 14-1b to 14-9b. A low-concentration polluted gas flow G-12b flowing along the discharge electrodes 12-5b, which are arranged in the vicinity at a desired interval in the flow direction of the polluted gas and in the direction perpendicular to the flow, is discharged. Since it comes, a low-concentration polluted gas lead-out unit 11-5b in the form of a collecting pipe is provided in each rear part and collected, and the gas is sequentially flowed into the nth stage dust collecting part 11-3n which is the final stage. .. In the n-th stage dust collecting section 11-3n, the flow rate of the polluted gas is reduced due to the outflow of the high-concentration polluted gas G-13b, but each of the second rectangular shells 14-1b, which is a module of the second stage. It has the same number of shells as the shell group of ~ 14-9b, and contains the shell group of the nth rectangular shell 14-1n to 14-9n which is the nth stage module.

Similar to the second rectangular shells 14-1b to 14-9b, the nth rectangular shells 14-1n to 14-9n also have a high-concentration polluted gas flow flowing along the dust collecting electrodes 12-6n forming the inner peripheral surface. Since G-13n is discharged, a low-concentration polluted gas lead-out unit 11-4n in the form of a collective pipe is provided at the rear portion and is configured to flow into the aggregated high-concentration pollutant gas lead-out pipe 11-6. The cyclone of the separate dust collector (not shown) gives kinetic energy to the dust and PM such as soot and dust with a blower to efficiently separate and remove the dust and discharge it to a discharge pipe (not shown). There is.

On the other hand, the discharge electrodes 12- are arranged in the vicinity of the center of each of the nth rectangular shells 14-1n to 14-9n at desired intervals in the flow direction of the polluted gas and in the direction perpendicular to the flow. The low-concentration polluted gas flow G-12n discharged along the 5n has a gradually reduced diameter in which low-concentration polluted gas lead-out portions 11-5n in the form of a collecting pipe are provided at the rear portions and aggregated and continuously provided behind the portions. Dust such as soot and dust and PM are separated and collected and removed from the outflow pipe (drawing omitted) through the connecting pipe (drawing omitted) so that it becomes a clean discharge gas flow G-5 and is released to the atmosphere. It is configured in.

Further, the dust collecting portions 11-3a, 11-3b, 11-3n are the discharge electrodes 12-5a, 12-5b, 12-5n and the dust collecting electrodes 12 constituting the ESP 12a, 12b, 12n of each stage. 1st rectangular shells 14-1a to 14-9a, 2nd rectangular shells 14-1b to 14-9b, and nth rectangular shells 14-1n to 14-9n each containing -6a, 12-6b, and 12-6n. The distance from the dust collecting electrodes 12-6a, 12-6b, and 12-6n constituting the above is about 50 mm, and the first rectangular shells 14-1a to 14-9a and the second rectangular shells 14-1b to the above are also formed. 14-9b, the inner surfaces of the dust collecting electrodes 12-6a, 12-6b, 12-6n constituting the n-th rectangular shell 14-1n to 14-9n, and the high-concentration polluted gas outlet 11-4a, 11-4b, 11 The distance from each of -4n is preferably about 10 mm.

Further, in each of the dust collecting portions 11-3a, 11-3b, 11-3n, electrode support rods vertically installed on the seal air introduction pipe portions 12-1a, 12-1b, 12-1n provided on the upstream side thereof. 12-2a, 12-2b, 12-2n, and a large number of electrode holders 12-4a, 12-4b, 12 via a large number of electrode stays 12-3a, 12-3b, 12-3n provided on the electrode support rods. According to -4n, each of the polluted gases contained in the first rectangular shells 14-1a to 14-9a, the second rectangular shells 14-1b to 14-9b, and the nth rectangular shells 14-1n to 14-9n. A plurality of discharge electrodes 12-5a, 12-5b, and 12-5n are provided in the flow direction and the direction perpendicular to the flow. Further, the discharge electrodes 12-5a, 12-5b, and 12-5n also have a linear wire, a triangular shape, or a saw blade shape in the polluted gas, similarly to the discharge electrodes 2-5 of the first embodiment device. It is possible to use a metal structure which is made of a plate material or the like and has a large number of protruding shapes in consideration of reducing the flow resistance to the polluted gas flow as much as possible.

Since the flow rate of the low-concentration polluted gas flow gradually decreases as the high-concentration polluted flow branches down from each shell, the dust collecting section in the second and subsequent stages is sequentially miniaturized to have a cross-sectional area of the flow path. The dust collector may be made smaller and cheaper by reducing the number of shells and the number of shells. Further, in the embodiment, a dust collector in which each module consists of a group of nine rectangular shells is illustrated, but the number of rectangular shells constituting the module is not particularly limited, and is appropriately determined according to the scale of the dust collector. You can set it.

[Example verification result]
Next, a comparison of the sizes of the devices of the rectangular cross-section ESP of the present invention and the circular cross-section ESP of the prior art will be shown, and the superiority of the present invention will be described.
The following is a comparison of the verification results for marine diesel engines.
<Engine conditions>
・ Engine output: 2,500 kW
-Exhaust gas flow rate (gas temperature 300 ° C): 30,000 m ³ / Hr

1. 1. ESP verification conditions ・ Target ESP dust collection rate: 50%
・ Exhaust gas flow velocity in ESP: 10 m / s
2. 2. Verification results-Table 1 shows the verification results.

1. 1. ESP verification conditions ・ Target ESP dust collection rate: 88%
・ Exhaust gas flow velocity in ESP: 10 m / s
2. 2. Verification results-Table 2 shows the verification results.

As is clear from the verification results of Example 1 and Example 2 above, the rectangular cross-section ESP of the present invention not only reduces the total length of the device but also the total volume as compared with the conventional circular cross-section ESP. It is clear that the present invention can significantly reduce the size of the device. Therefore, when the ESP is installed in a limited space such as a ship, the rectangular cross-section ESP of the present invention exerts a particularly excellent effect.

1, 11a, 11b, 11n Electrostatic precipitator 1-1 Introduction pipe 1-2, 1-8 Joint pipe 1-3, 11-3, 11-3a, 11-3b, 11-3n Dust collector 1-4 , 11-4a, 11-4b, 11-4n High-concentration polluted gas lead-out unit 1-5, 11-5a, 11-5b, 11-5n Low-concentration pollutant gas lead-out unit 1-6, 11-6 High-concentration pollutant gas Derivation pipe 1-7, 11-7 Low concentration polluted gas Derivation pipe 1-9 Outlet pipe 2, 12a, 12b, 12n Electrostatic precipitator (ESP)
2-1, 12-1a, 12-1b, 12-1n Seal air introduction tube 2-2, 12-2a, 12-2b, 12-2n Electrode support rods 2-3, 12-3a, 12-3b, 12-3n Electrode stays 2-4, 12-4a, 12-4b, 12-4n Electrode holders 2-5, 12-5a, 12-5b, 12-5n Discharge electrodes 2-6, 12-6a, 12-6b , 12-6n Dust collection electrode 3 Separation dust collection unit 3-1 Cyclone 3-2 Discharge pipe 3-3 Blower 4-1, 4-2, 4-3, 4-4, 4-5, 4-6, 4 -7, 4-8, 4-9 Rectangular shells 14-1a, 14-2a, 14-3a, 14-4a, 14-5a, 14-6a, 14-7a, 14-8a, 14-9a First rectangular Shells 14-1b, 14-2b, 14-3b, 14-4b, 14-5b, 14-6b, 14-7b, 14-8b, 14-9b Second rectangular shells 14-1n, 14-2n, 14- 3n, 14-4n, 14-5n, 14-6n, 14-7n, 14-8n, 14-9n nth rectangular shell G-1 polluted gas flow G-2, G-12a, G-12b, G-12n Low-concentration polluted gas flow G-3, G-13a, G-13b, G-13n High-concentration polluted gas flow G-4 Cyclone polluted gas flow G-5 Emitted gas flow

According to the present invention, exhaust gas from diesel engines for ships, power generation, industrial use, etc., indoor dust, boilers, incinerators, welding devices, brazing devices, painting devices, welding / brazing / painting, etc. are implemented. Polluted gas containing exhaust gas, fume, dust, etc. emitted from tunnels of factories, highways, vehicle roads, etc. (The polluted gas contains fine particles, and these fine particles have a particle size. The smaller it is, the easier it is to float. For example, PM10 (particle size 10 μm or less) is known as a suspended particulate matter, and the PM (granular substance), dust, etc. in PM10 (granular substance) in the atmosphere and hardly falls to the ground surface by gravity. It is related to an electrostatic precipitator that uses corona discharge to remove dust such as fume and dust, and more specifically, pollutant gas containing PM, indoor dust, flue gas, fume, dust, etc. in diesel engine exhaust gas. The present invention relates to an electrostatic precipitator provided with a dust collector having a built-in electrostatic precipitator (hereinafter, referred to as “ESP” for convenience of explanation) composed of a discharge electrode and a dust collection electrode in the wake of the introduction pipe.

As a method for electrostatically treating dust such as PM, soot, fume, and dust in diesel engine exhaust gas by using corona discharge, for example, Patent Documents 1 and 2 previously proposed by the present applicant are known. There is.
That is, in Patent Document 1, as the outline is shown in FIG. 10, the discharge electrode 101-2 for charging the granular substance contained in the exhaust gas of the large exhaust gas diesel engine using low quality fuel of heavy oil or less, and the charging The discharge electrode 101-2 has a tubular collecting portion 101 having a predetermined length that constitutes a dust collecting electrode for collecting the granular substances, and the discharge electrode 101-2 is a collecting pipe 101- that constitutes the tubular collecting portion 101. An electrostatic dust collecting means composed of a main electrode 101-2a arranged in 1 in the direction of the tube axis and a plurality of radially protruding electrode needles 101-2b spaced apart from the main electrode, and the above. In an exhaust gas treatment device for a diesel engine provided with a cyclone-type separate collection means 102 that separates and collects granular substances separated from the tubular collection unit 101, the granular material is granular near the axis on the downstream side of the tubular collection unit 101. The low-concentration exhaust gas outlet pipe 103 for the substance is provided with the high-concentration exhaust gas lead-out section 101-1b near the inner peripheral surface on the downstream side of the tubular collection section, and the granular material high-concentration exhaust gas lead-out section 101-1b is provided with the granular substance. Cyclone collecting means 102-1 for collecting substances is continuously provided, and the cyclone collecting means is composed of tangent cyclone 102-1a, and the opening degree of the damper 107 arranged in the low-concentration exhaust gas outlet pipe 103. When the length of the collection pipe 101-1 is L and the inner diameter of the collection pipe is D, there is no mechanism for controlling the exhaust gas inflow speed into the tangent cyclone 102-1a by controlling. An exhaust gas treatment device for a large-emission diesel engine using a low-quality fuel of heavy oil or less, characterized in that the relationship satisfies the condition of 5D ≦ L ≦ 15D, has been proposed.

Further, in Patent Document 2, for example, as shown in outline in FIG. 11, a granular substance contained in the exhaust gas of a diesel engine using heavy oil in a tubular precipitator portion composed of a main precipitator pipe 201 having a predetermined length. A tubular collecting portion 201-of a predetermined length constituting the discharge electrodes 211-1A-1, 201-2A-1, 201-3A-1, and the dust collecting electrode for collecting the charged granular substances. The discharge electrode has 1, 201-2, and 201-3, and the discharge electrode is composed of a main electrode 202 arranged in a tubular precipitator in the tube axis direction and a radially protruding electrode arranged on the main electrode. Tubular collectors 21-1, 201-2, 2013-3, which are provided with the configured electrostatic precipitator and are composed of the discharge electrode and the main precipitator having a single diameter and a predetermined length. A discharge electrode of a diesel engine exhaust gas treatment device in which tubular precipitators that are short in the axial direction and have different diameters are arranged in a plurality of stages, and that is an at least one tubular precipitator of the tubular precipitator arranged in the plurality of stages. The discharge electrode support cylinder 211-1A- is concentric with the concentric main electrode to which the discharge electrode is attached to the outer periphery of the main electrode 202 via stays 201-1A-1e, 201-2A-1e, 201-3A-1e. 1d, 201-2A-1d, 201-3A-1d and short discharge electrode needles 2011-1A-arranged radially on the surface of the discharge electrode support cylinder at desired intervals in the circumferential direction and the tube axis direction. It is composed of 1c, 201-2A-1c, 201-3A-1c or a low-height saw-blade discharge electrode plate, and the radial length of the short discharge electrode needle or the low-height saw-blade discharge electrode plate. The distance between the tip of the discharge electrode needle or the low-height saw blade-shaped discharge electrode plate and the collection wall surface is 30 to 70 mm, and the most upstream tubular collection module of the tubular collection portion is described. For treating exhaust gas from a diesel engine, the upstream opening end of the discharge electrode support cylinder is closed by conical lid portions 211-1A-1d', 201-2A-1d', 201-3A-1d'. A discharge electrode for an electrostatic precipitator has been proposed by the applicant.

Patent No. 5863087 JP-A-2017-952

However, the above-mentioned conventional electrostatic precipitator has the following problems.
That is, in the exhaust gas treatment apparatus for a large-diameter diesel engine that uses low-quality fuel less than heavy oil described in Patent Documents 1 and 2, the tubular collecting portions 101, 201-1, 201-2, 201- The collection pipe having the inner surface constituting 3 as the collection wall surface requires a long length having a circular cross section and a ratio of the length L to the inner diameter D of L = 5D to 15D, and the tubular collection. Since the cross section of the part is circular, the area efficiency of the cross section is lower than that of the rectangular (square) cross section (comparing the rectangular (square) cross section with the side length D and the circular cross section with the diameter D D ² : 1/4 · πD ² and "1/4 · π ≈ 0.7853", that is, the area equivalent to about 21% is small), so the dust collector using a collecting pipe with a circular cross section is long and has a large diameter. It had to be a large-scale device, and there was a problem that it was difficult to secure an installation space when installing the dust collector.

The present invention has been made to solve the above-mentioned problems of the prior art, and in particular, an introduction pipe into which polluted gas containing dust such as PM, indoor dust, flue gas, fume, and dust in diesel engine exhaust gas flows in. An electrostatic precipitator equipped with a dust collector having a built-in electrostatic electrostatic precipitator composed of a discharge electrode and a dust collection electrode in the wake, and the inner surface constituting the tubular precipitator is a collection wall surface. By adopting a rectangular precipitator instead of the conventional circular precipitator, we have realized a miniaturization of the device and proposed an electrostatic precipitator with excellent volume efficiency in the installation space. It is something to try.

The first electrostatic precipitator according to the present invention has a discharge electrode and a precipitator in the wake of an introduction pipe into which polluted gas containing dust such as PM, indoor dust, flue gas, fume, and dust in the diesel engine exhaust gas flows. In an electrostatic precipitator provided with a dust collector having a built-in electrostatic electrostatic precipitator composed of dust electrodes, the dust collector includes the discharge electrode and the dust collecting electrode and is perpendicular to the flow direction of polluted gas. It has at least one rectangular tubular body having a rectangular cross section and a predetermined length in the flow direction of pollutant gas, and the four flat wall surfaces of the rectangular tubular body are used as dust collecting electrodes and the dust collecting electrodes. The discharge electrodes are arranged near the center of the rectangular tubular body while maintaining the discharge intervals at predetermined intervals in the flow direction of the polluted gas and in the direction perpendicular to the flow, and flow along the dust collecting electrodes. A high-concentration polluted gas outlet that collects and discharges a high-concentration polluted gas flow that contains dust and the like in a high concentration, and a low-concentration polluted gas flow that collects and discharges a low-concentration polluted gas flow that collects and discharges dust and the like flowing along the discharge electrode. The low-concentration polluted gas lead-out section is provided at the rear portion of the rectangular tubular body, and the high-concentration polluted gas lead-out pipe is provided in the wake of the high-concentration pollutant gas lead-out section. A low concentration dust collector is provided in the stream to remove dust and the like from the high-concentration exhaust gas stream, and a discharge pipe is provided in the wake of the separate dust collector, and is arranged in the wake of the low-concentration polluted gas outlet. It is characterized in that a low-concentration polluted gas is discharged as a discharge gas flow from a high-concentration polluted gas outlet pipe.
The dust collecting portion in the first electrostatic precipitator is composed of a module composed of a group of tubular bodies in which a plurality of the rectangular tubular bodies are laminated in parallel, and each of the rectangular tubular bodies has the high concentration pollution. It is a preferred embodiment that the gas outlet and the low-concentration polluted gas outlet are arranged in a collecting pipe shape.

Further, the second electrostatic precipitator according to the present invention has a discharge electrode and a discharge electrode in the wake of the introduction pipe into which polluted gas containing dust such as diesel engine exhaust gas, PM, indoor dust, smoke exhaust, fume, and dust flows. In an electrostatic precipitator provided with a plurality of dust collectors having a built-in electrostatic electrostatic precipitator composed of dust collecting electrodes, each dust collecting unit has the discharge electrode and the dust collecting electrode built-in and the flow direction of polluted gas. At least one rectangular tubular body having a rectangular cross section perpendicular to and having a desired length in the pollutant gas flow direction is arranged in a plurality of stages in the pollutant gas flow direction, and the flat 4 of the rectangular tubular body is arranged. The wall surface is used as a dust collecting electrode, and the discharge interval is maintained with the dust collecting electrode, and the discharge electrode is held near the center of the rectangular tubular body at predetermined intervals in the flow direction of the polluted gas and in the direction perpendicular to the flow. A high-concentration polluted gas outlet that collects and discharges a high-concentration polluted gas flow containing a high concentration of dust and the like flowing along the dust collecting electrode, and a low dust and the like flowing along the discharge electrode. A low-concentration polluted gas outlet that collects and discharges a low-concentration polluted gas flow contained in the concentration is provided at the rear of the rectangular tubular body, and a high-concentration polluted gas outlet pipe is provided at the wake of the high-concentration polluted gas outlet. The high-concentration polluted gas outlet pipe is provided with a separate dust collector having a discharge pipe so as to remove dust and the like from the high-concentration polluted gas flow and release the low-concentration polluted gas. The lead-out unit is connected to the dust collector having a rectangular tubular body in the latter stage for repurification treatment or connected to the low-concentration polluted gas lead-out pipe to discharge the low-concentration polluted gas flow as a discharge gas flow. It is a feature.
Each of the dust collecting portions in the second electrostatic precipitator is composed of a module composed of a group of tubular bodies in which a plurality of the rectangular tubular bodies are laminated in parallel, and each of the rectangular tubular bodies has the high concentration. It is a preferred embodiment that the pollutant gas lead-out portion and the low-concentration pollutant gas lead-out portion are arranged in a collecting pipe shape.

In the electrostatic precipitator according to the present invention, dust and the like are basically collected by an electrostatic precipitator mounted on a dust collecting unit in the same manner as the electrostatic precipitator of Patent Document 2. The problems of the prior art and the effects of the present invention will be described below with reference to FIGS. 8a, 8b, 9a and 9b. The following (a), (b1), and (b2) correspond to FIGS. 8a and 8b.

(I). As shown in FIG. 8a, the electrostatic precipitator according to the present invention has a rectangular cross section of the dust collecting portion, so that there is wasted space existing at the four corners of the rectangle as compared with the conventional ESP having a circular cross section. There is no (dead space that does not contribute to collection), and the area efficiency of the rectangular cross section is excellent by about 21% as described in paragraph 0005, and as a result, the volume efficiency in the installation space is excellent.

(B-1). In the conventional circular cross-section ESP, corona discharge to dust passing outside the cylindrical collection wall of collection tubes (small diameter collection tube to large diameter collection tube) + Coulomb force generation + collection surface Although there was a wasted space in which adhesion could not be generated, the rectangular cross-section ESP of the present invention does not have this wasted space, so that the volume efficiency in the installation space is excellent.

(B-2). In the circular cross-section ESP of the prior art, there is a wasted space in which corona discharge + Coulomb force generation + collection surface adhesion cannot be generated to the dust passing through the inner surface side of the cylindrical discharge electrode support cylinder. Since this wasted space does not exist in the rectangular cross-section ESP of the above, the volume efficiency in the installation space is excellent.

(C). In addition, the main dimensions of the device in which the rectangular cross-section ESPs of the present invention are connected in series in a plurality of stages (corresponding to Examples 2, FIGS. 4 and 5) and the device of the prior art circular cross-section ESP (corresponding to FIG. 11) are shown. Shown and quantitatively compare the effects of the present invention.
First, the effect on the dust collection efficiency when a plurality of rectangular cross-section ESPs are connected in series is shown. FIG. 6 shows a schematic explanatory view of a dust collector in which rectangular cross-section ESPs are connected in series, for example, in three stages, and FIG. 7 shows the dust collection efficiency.

Dust collection rate when multiple stages of rectangular cross-section ESPs are connected in series <Verification conditions>
Dust collection rate η (%); 50%, 60%, 70%
Total dust collection rate; ηT (%) [ηT = 1- (1-η) n]
Number of connecting stages n; 3 stages <Result>
(1). The total dust collection rate is 88% when the dust collection parts with a dust collection rate of 50% are connected in series in three stages.
(2). The total dust collection rate is 94% when the dust collection parts with a dust collection rate of 60% are connected in series in three stages.
(3). Total dust collection efficiency of 98% when three stages of dust collection parts with a dust collection rate of 70% are connected in series.

From the above results, it is clear that the total dust collection rate increases as described above when the rectangular cross-section ESPs are connected in multiple stages. Therefore, in practical equipment, from the viewpoint of the scale, manufacturing, installation, operation, etc. of the dust collector, the length of each ESP is shortened and the total dust collection is performed by connecting multiple short ESPs. It is practical to improve the rate.

(D). A conceptual comparison of the sizes of ESPs of the present invention and the prior art is shown below.
8a and 8b are conceptual explanatory views showing that there is wasted space in the circular cross-section ESP of the prior art (Patent Document 2) as described above, and FIGS. 9a and 9b are the rectangular cross-section ESP of the present invention. It is a conceptual explanatory view of the dimension of 1 module of. Comparing both figures, it can be seen that the wasted space is reduced in the rectangular cross-section ESP.
Regarding the superiority of the present invention, the verification results of Examples 1 and 2 are shown in [Example Verification Results] described later, and the rectangular cross-section ESP of the present invention is significantly larger than the circular cross-section ESP of the prior art. It details that the miniaturization can be achieved. When the ESP is installed in a limited space such as a ship, the rectangular cross-section ESP of the present invention is particularly effective.

(E). The rectangular precipitator ESP of the electrostatic precipitator according to the present invention corresponds to a collecting portion having a rectangular cross section in which a plurality of rectangular tubular bodies made of rectangular dust collecting electrodes are laminated, and a electrode support rod corresponding to the rectangular tubular body. Since the dust collecting part of the ESP, which is the main part of the electrostatic precipitator, can be easily assembled by inserting the discharge electrodes arranged in the above direction, the assembly workability is excellent and the manufacturing cost of the electrostatic precipitator is reduced. It can also be reduced.

It is a schematic vertical sectional view which shows the main part of the whole structure of the 1st Example apparatus of this invention. FIG. 1 is an enlarged vertical sectional view taken along the line AA. FIG. 1 is an enlarged vertical cross-sectional view taken along the line BB. It is a schematic vertical sectional view which shows the main part of the whole structure of the 2nd Example apparatus of this invention. FIG. 4 is an enlarged vertical sectional view taken along the line CC. It is a schematic explanatory drawing which shows the electric dust collector which connected three stages of ESP in series as an Example by ESP of this invention. It is a figure which shows the calculation example of the dust collection rate of the electric dust collector shown in FIG. It is a schematic side view which shows the concept of the conventional circular cross-section electrostatic precipitator. It is a schematic shaft sectional view which shows the concept of the conventional circular sectional electric dust collector. It is a schematic side which shows the concept of the electrostatic precipitator of the rectangular cross section of this invention. It is a schematic shaft sectional view which shows the concept of the electrostatic precipitator of the rectangular cross section of this invention. It is the schematic which shows an example of the conventional electrostatic precipitator. It is the schematic which shows another example of the conventional electrostatic precipitator.

I. First Example device (ESP 1-stage system):
The first embodiment device of the present invention shown in FIGS. 1 to 3 includes exhaust gas of diesel engines for ships, power generation, industrial use, etc., indoor dust and boilers, incinerators, welding devices, brazing devices, and coating. Removes dust such as soot and dust in polluted gas containing smoke, fume, dust, etc. emitted from equipment, factories where welding, brazing, painting, etc. are performed, tunnels on highways and vehicle roads, etc. The dust collecting mechanism is the same as that of Patent Documents 1 and 2 (the dust collecting mechanism is the same as that of Patent Documents 1 and 2), and the structure of the electrostatic precipitator 1 is a joint pipe 1-continuously connected to the introduction pipe 1-1 into which the polluted gas flows. Nine rectangles with built-in discharge electrodes 2-5 and dust collection electrodes 2-6 that are supplied with high-pressure power supply controlled by an externally installed high-pressure power supply device (not shown) in the wake of 2. A dust collecting unit 1-3 in which a module consisting of a shell group of a tubular body (hereinafter, referred to as a “rectangular shell” for convenience of explanation) 4-1 to 4-9 has one stage of ESP2 is arranged.

The dust collecting portions 1-3 are provided with a high-concentration polluted gas flow G-3 discharged along the dust collecting electrodes 2-6 forming the inner peripheral surfaces of the rectangular shells 4-1 to 4-9. In order to remove dust and PM such as the soot and dust contained therein, high-concentration polluted gas out-licensing units 1-4 in the form of collective pipes are continuously provided, and each of the high-concentration polluted gas out-licensing units 1-4 is provided. The high-concentration polluted gas flow G-3 is supplied to the cyclone 3-1 of the separated dust collecting unit 3 via the assembled high-concentration polluted gas outlet pipe 1-6, and the high-concentration polluted gas flow. Dust and PM such as soot and dust contained in G-3 are separated and removed with high efficiency by applying kinetic energy with a blower 3-3, and cyclone polluted gas flow G from the discharge pipe 3-2. As -4, it is configured to be discharged to the outlet pipe 1-9 described later.

On the other hand, a plurality of discharge electrodes 2-5 are arranged in the vicinity of the center of each of the rectangular shells 4-1 to 4-9 at desired intervals in the flow direction of the polluted gas and in the direction perpendicular to the flow. The low-concentration polluted gas flow G-2 discharged along the line includes a low-concentration polluted gas lead-out pipe 1-7 in which a low-concentration pollutant gas lead-out unit 1-5 in the form of a collecting pipe is provided and aggregated at the rear portion thereof, and A clean discharge gas flow in which dust such as soot and dust and PM are collected and removed from the outlet pipe 1-9 via the gradually reducing diameter joint pipe 1-8 connected to the rear of the low-concentration polluted gas outlet pipe. It is configured to become G-5 and be released into the atmosphere or the like.

Further, as shown in FIG. 2, the dust collecting unit 1-3 is composed of each rectangular shell 4-1 to 4-9 having a discharge electrode 2-5 and a dust collecting electrode 2-6 each constituting the ESP2. The distance between the discharge electrode 2-5 and the dust collecting electrode 2-6 constituting each of the rectangular shells 4-1 to 4-9 is not particularly limited, but about 50 mm is used for each of the rectangular shells. The distance between the dust collecting electrodes 2-6 constituting the shells 4-1 to 4-9 and the inner surface of the high-concentration polluted gas leading-out unit 1-4 is preferably about 10 mm.

Further, on the upstream side of the dust collecting portion 1-3, as shown in FIG. 1, a large number of electrode stays 2-3 are interposed on the electrode support rods 2-2 vertically provided on the seal air introduction pipe portion 2-1. A large number of electrode holders 2-4 are attached, and each of the discharge electrodes 2-5 incorporated in each of the rectangular shells 4-1 to 4-9 by the electrode holder 2-4 is attached to the pollutant gas flow direction and the said. Multiple are provided in the direction perpendicular to the flow. Further, the discharge electrode 2-5 is made of a linear wire, a triangular or saw blade-shaped plate material, etc. in the polluted gas, so that the flow resistance to the polluted gas flow is reduced as much as possible. A metal structure having a large number of protruding shapes can be used.

It should be noted that the seal air introduction pipes 2-1 provided with the seal air introduction pipes 2-1 on both the upstream and downstream sides of the polluted gas of the dust collection parts 1-3 and the dust collection electrodes 2-6 on both sides are provided. A structure may be formed in which the discharge electrode is held through and held in both directions. Further, here, a module composed of a group of rectangular shells in which nine rectangular shells are laminated is illustrated, but it goes without saying that the module may be composed of a single shell. Further, a configuration example of a vertically long rectangular cross-sectional shape in which each rectangular shell is arranged in parallel with the vertically elongated electrode support rod 2-2 is shown, but a horizontally long rectangular shape arranged orthogonally to the electrode support rod 2-2 is shown. It may have a cross-sectional shape, and it goes without saying that the arrangement direction of the rectangular shell does not matter.

II. Second Example Device (ESPN Stage Method):
Similar to the device of the first embodiment, the exhaust gas of diesel engines for ships, power generation, industrial use, etc., indoor dust and boilers, incinerators, welding devices, brazing devices, coating devices, welding / brazing, etc. A book using corona discharge that removes dust such as soot and dust in polluted gas containing smoke, fume, dust, etc. emitted from factories where painting is performed, tunnels on highways and vehicle roads, etc. As shown in FIGS. 4 and 5, the apparatus of the second embodiment of the present invention is controlled by being wired to an externally installed high-voltage power supply device in the wake of the joint pipe connected to the introduction pipe into which the polluted gas flow flows. A module consisting of a group of nine first rectangular shells 14-1a to 14-9a incorporating a discharge electrode 12-5a and a dust collection electrode 12-6a, which are supplied with a high-voltage power supply, is the first stage ESP12a. A module consisting of a shell group of nine second rectangular shells 14-1b to 14-9b containing a dust collecting unit 11-3a, a discharge electrode 12-5b, and a dust collecting electrode 12-6b is in the second stage. The nth stage is a module consisting of a group of n first rectangular shells 14-1n to 14-9n containing an ESP12b built-in dust collecting unit 11-3b, a discharge electrode 12-5n and a dust collecting electrode 12-6n. The dust collecting units 11-3n containing the ESP12n of the above are arranged in series.

The high-concentration polluted gas flow G-13a discharged into the dust collecting portion 11-3a along the dust collecting electrode 12-6a forming the inner peripheral surface of the first rectangular shells 14-1a to 14-9a. In order to remove dust and PM such as soot and dust contained in the above, a high-concentration polluted gas lead-out pipe 11 in which a high-concentration pollutant gas lead-out portion 11-4a in the form of a collecting pipe is provided and aggregated at the rear portion respectively. The high-concentration polluted gas flow G-13a is configured to be supplied to a cyclone of a separate dust collector (not shown) via -6, and the cyclone moves dust such as soot and dust and PM with a blower. It is configured to apply energy to separate and remove dust with high efficiency and discharge it to a discharge pipe (not shown).

On the other hand, the discharge electrodes 12- are arranged in the vicinity of the center of each of the first rectangular shells 14-1a to 14-9a at desired intervals in the flow direction of the polluted gas and in the direction perpendicular to the flow. The second-stage dust collecting section 11-3b into which the low-concentration polluted gas flow G-12a discharged along 5a flows in is provided with a collecting pipe-shaped low-concentration polluted gas lead-out section 11-5a at the rear thereof. In the dust collecting section 11-3b, the flow rate of the polluted gas is reduced due to the outflow of the high-concentration polluted gas G-13a, but each of the first-stage modules is the first-stage module. 1 The number of shells is the same as that of the rectangular shells 14-1a to 14-9a, and the shell group of the second rectangular shells 14-1b to 14-9b, which is the second stage module, is built in.

In the second rectangular shells 14-1b to 14-9b, the high-concentration polluted gas flow G-13b flowing along the dust collecting electrodes 12-6b forming the inner peripheral surface is discharged, so that the low concentration is like a collecting pipe. The concentration polluted gas lead-out section 11-4b is provided at the rear portion and is configured to flow into the high-concentration pollutant gas lead-out pipe 11-6, and the center of each of the second rectangular shells 14-1b to 14-9b. A low-concentration polluted gas flow G-12b flowing along the discharge electrodes 12-5b, which are arranged in the vicinity at a desired interval in the flow direction of the polluted gas and in the direction perpendicular to the flow, is discharged. Since it comes, a low-concentration polluted gas lead-out unit 11-5b in the form of a collecting pipe is provided in each rear part and collected, and the gas is sequentially flowed into the nth stage dust collecting part 11-3n which is the final stage. .. In the n-th stage dust collecting section 11-3n, the flow rate of the polluted gas is reduced due to the outflow of the high-concentration polluted gas G-13b, but each of the second rectangular shells 14-1b, which is a module of the second stage. It has the same number of shells as the shell group of ~ 14-9b, and contains the shell group of the nth rectangular shell 14-1n to 14-9n which is the nth stage module.

Similar to the second rectangular shells 14-1b to 14-9b, the nth rectangular shells 14-1n to 14-9n also have a high-concentration polluted gas flow flowing along the dust collecting electrodes 12-6n forming the inner peripheral surface. Since G-13n is discharged, a low-concentration polluted gas lead-out unit 11-4n in the form of a collective pipe is provided at the rear portion and is configured to flow into the aggregated high-concentration pollutant gas lead-out pipe 11-6. The cyclone of the separate dust collector (not shown) gives kinetic energy to the dust and PM such as soot and dust with a blower to efficiently separate and remove the dust and discharge it to a discharge pipe (not shown). There is.

On the other hand, the discharge electrodes 12- are arranged in the vicinity of the center of each of the nth rectangular shells 14-1n to 14-9n at desired intervals in the flow direction of the polluted gas and in the direction perpendicular to the flow. The low-concentration polluted gas flow G-12n discharged along the 5n has a gradually reduced diameter in which low-concentration polluted gas lead-out portions 11-5n in the form of a collecting pipe are provided at the rear portions and aggregated and continuously provided behind the portions. Dust such as soot and dust and PM are separated and collected and removed from the outflow pipe (drawing omitted) through the connecting pipe (drawing omitted) so that it becomes a clean discharge gas flow G-15 and is released to the atmosphere. It is configured in.

Further, the dust collecting portions 11-3a, 11-3b, 11-3n are the discharge electrodes 12-5a, 12-5b, 12-5n and the dust collecting electrodes 12 constituting the ESP 12a, 12b, 12n of each stage. 1st rectangular shells 14-1a to 14-9a, 2nd rectangular shells 14-1b to 14-9b, and nth rectangular shells 14-1n to 14-9n each containing -6a, 12-6b, and 12-6n. The distance from the dust collecting electrodes 12-6a, 12-6b, and 12-6n constituting the above is about 50 mm, and the first rectangular shells 14-1a to 14-9a and the second rectangular shells 14-1b to the above are also formed. 14-9b, the inner surfaces of the dust collecting electrodes 12-6a, 12-6b, 12-6n constituting the n-th rectangular shell 14-1n to 14-9n, and the high-concentration polluted gas outlet 11-4a, 11-4b, 11 The distance from each of -4n is preferably about 10 mm.

Further, in each of the dust collecting portions 11-3a, 11-3b, 11-3n, electrode support rods vertically installed on the seal air introduction pipe portions 12-1a, 12-1b, 12-1n provided on the upstream side thereof. 12-2a, 12-2b, 12-2n, and a large number of electrode holders 12-4a, 12-4b, 12 via a large number of electrode stays 12-3a, 12-3b, 12-3n provided on the electrode support rods. According to -4n, each of the polluted gases contained in the first rectangular shells 14-1a to 14-9a, the second rectangular shells 14-1b to 14-9b, and the nth rectangular shells 14-1n to 14-9n. A plurality of discharge electrodes 12-5a, 12-5b, and 12-5n are provided in the flow direction and the direction perpendicular to the flow. Further, the discharge electrodes 12-5a, 12-5b, and 12-5n also have a linear wire, a triangular shape, or a saw blade shape in the polluted gas, similarly to the discharge electrodes 2-5 of the first embodiment device. It is possible to use a metal structure which is made of a plate material or the like and has a large number of protruding shapes in consideration of reducing the flow resistance to the polluted gas flow as much as possible.

Since the flow rate of the low-concentration polluted gas flow gradually decreases as the high-concentration polluted flow branches down from each shell, the dust collecting section in the second and subsequent stages is sequentially miniaturized to have a cross-sectional area of the flow path. The dust collector may be made smaller and cheaper by reducing the number of shells and the number of shells. Further, in the embodiment, a dust collector in which each module consists of a group of nine rectangular shells is illustrated, but the number of rectangular shells constituting the module is not particularly limited, and is appropriately determined according to the scale of the dust collector. You can set it.

[Example verification result]
Next, a comparison of the sizes of the devices of the rectangular cross-section ESP of the present invention and the circular cross-section ESP of the prior art will be shown, and the superiority of the present invention will be described.
The following is a comparison of the verification results for marine diesel engines.
<Engine conditions>
・ Engine output: 2,500 kW
-Exhaust gas flow rate (gas temperature 300 ° C): 30,000 m ³ / Hr

1. 1. ESP verification conditions ● Target ESP dust collection rate: 50%
● Exhaust gas flow velocity in ESP: 10 m / s
2. 2. Verification results ● Table 1 shows the verification results.

1. 1. ESP verification conditions ● Target ESP dust collection rate: 88%
● Exhaust gas flow velocity in ESP: 10 m / s
2. 2. Verification results ● Table 2 shows the verification results.

As is clear from the verification results of Example 1 and Example 2 above, the rectangular cross-section ESP of the present invention not only reduces the total length of the device but also the total volume as compared with the conventional circular cross-section ESP. It is clear that the present invention can significantly reduce the size of the device. Therefore, when the ESP is installed in a limited space such as a ship, the rectangular cross-section ESP of the present invention exerts a particularly excellent effect.

1, 11a, 11b, 11n Electrostatic precipitator 1-1 Introduction pipe 1-2, 1-8 Joint pipe 1-3, 11-3, 11-3a, 11-3b, 11-3n Dust collector 1-4 , 11-4a, 11-4b, 11-4n High-concentration polluted gas lead-out unit 1-5, 11-5a, 11-5b, 11-5n Low-concentration pollutant gas lead-out unit 1-6, 11-6 High-concentration pollutant gas Derivation pipe 1-7, 11-7 Low concentration polluted gas Derivation pipe 1-9 Outlet pipe 2, 12a, 12b, 12n Electrostatic precipitator (ESP)
2-1, 12-1a, 12-1b, 12-1n Seal air introduction tube 2-2, 12-2a, 12-2b, 12-2n Electrode support rods 2-3, 12-3a, 12-3b, 12-3n Electrode stays 2-4, 12-4a, 12-4b, 12-4n Electrode holders 2-5, 12-5a, 12-5b, 12-5n Discharge electrodes 2-6, 12-6a, 12-6b , 12-6n Dust collection electrode 3 Separation dust collection unit 3-1 Cyclone 3-2 Discharge pipe 3-3 Blower 4-1, 4-2, 4-3, 4-4, 4-5, 4-6, 4 -7, 4-8, 4-9 Rectangular shells 14-1a, 14-2a, 14-3a, 14-4a, 14-5a, 14-6a, 14-7a, 14-8a, 14-9a First rectangular Shells 14-1b, 14-2b, 14-3b, 14-4b, 14-5b, 14-6b, 14-7b, 14-8b, 14-9b Second rectangular shells 14-1n, 14-2n, 14- 3n, 14-4n, 14-5n, 14-6n, 14-7n, 14-8n, 14-9n nth rectangular shell G-1 polluted gas flow G-2, G-12a, G-12b, G-12n Low concentration polluted gas flow G-3, G-13a, G-13b, G-13n High concentration polluted gas flow G-4 Cyclone polluted gas flow G-5 , G-15 released gas flow

Claims (4)

Built-in electrostatic precipitator consisting of discharge electrode and dust collector electrode in the wake of the introduction pipe into which polluted gas containing dust such as PM, indoor dust, smoke exhaust, fume, dust, etc. in the diesel engine exhaust gas flows in. In an electrostatic precipitator provided with a dust collecting portion, the dust collecting portion incorporates the discharge electrode and the dust collecting electrode, and has a rectangular cross section perpendicular to the flow direction of the polluted gas and in the flow direction of the polluted gas. It has at least one rectangular tubular body having a predetermined length, and the four flat wall surfaces of the rectangular tubular body are used as dust collecting electrodes, and the discharge electrode is formed into the rectangular shape while maintaining a discharge interval with the dust collecting electrode. A high-concentration polluted gas that is arranged near the center of the tubular body at predetermined intervals in the flow direction of the polluted gas and in the direction perpendicular to the flow, and contains a high concentration of dust or the like flowing along the dust collecting electrode. The rectangular cylinder-shaped high-concentration polluted gas lead-out unit that collects and discharges the flow and the low-concentration polluted gas lead-out unit that collects and discharges the low-concentration polluted gas flow that contains dust and the like flowing along the discharge electrode at a low concentration. Along with providing each at the rear part of the body, a high-concentration polluted gas outlet pipe is provided in the wake of the high-concentration polluted gas outlet pipe, and dust and the like are removed from the high-concentration polluted gas flow in the wake of the high-concentration polluted gas outlet pipe. A low-concentration pollutant gas is discharged from the low-concentration polluted gas outlet pipe arranged in the wake of the low-concentration pollutant gas outlet by providing a separate dust collector and a discharge pipe in the wake of the separate dust collector. An electrostatic precipitator characterized in that it is configured to be discharged as a released gas flow. The dust collecting unit is composed of a module composed of a group of tubular bodies in which a plurality of the rectangular tubular bodies are laminated in parallel, and the high-concentration polluted gas outlet portion and the low-concentration polluted gas are provided in each of the rectangular tubular bodies. The electrostatic precipitator according to claim 1, wherein the lead-out portion is arranged in a collecting pipe shape. A electrostatic electrostatic precipitator consisting of a discharge electrode and a dust collection electrode is built in the wake of the introduction pipe into which polluted gas containing dust such as diesel engine exhaust gas, PM, indoor dust, smoke exhaust, fume, and dust flows. In an electrostatic precipitator provided with a plurality of dust collectors, each dust collector has a built-in discharge electrode and the dust collection electrode, and has a rectangular cross section perpendicular to the flow direction of polluted gas and a flow direction of polluted gas. At least one rectangular tubular body having a desired length is arranged in a plurality of stages in the flow direction of the pollutant gas, and the four flat wall surfaces of the rectangular tubular body are used as dust collecting electrodes and discharged from the dust collecting electrodes. The discharge electrodes are arranged near the center of the rectangular tubular body at predetermined intervals in the flow direction of the polluted gas and in the direction perpendicular to the flow, and the dust flows along the dust collecting electrodes. A high-concentration polluted gas lead-out unit that collects and discharges a high-concentration polluted gas flow containing a high concentration of dust, etc., and a low-concentration polluted gas flow containing a low concentration of dust flowing along the discharge electrode are collected and discharged. A low-concentration polluted gas outlet is provided at the rear of the rectangular tubular body, and a high-concentration polluted gas outlet pipe is connected to the wake of the high-concentration pollutant gas outlet. A dust collecting unit having a rectangular tubular body in the subsequent stage is configured to provide a separated dust collecting unit having a discharge pipe to remove dust and the like from the high-concentration polluted gas flow and release the low-concentration polluted gas outlet. An electrostatic precipitator characterized in that it is connected to a repurification treatment or a low-concentration polluted gas outlet pipe to discharge a low-concentration polluted gas flow as a discharged gas flow. Each of the dust collectors is composed of a module composed of a group of tubular bodies in which a plurality of the rectangular tubular bodies are laminated in parallel, and the high-concentration polluted gas lead-out portion and the low-concentration pollutant are formed on each of the rectangular tubular bodies. The electrostatic precipitator according to claim 3, wherein the gas outlet is arranged in a collecting pipe shape.

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