WO2014122756A1 - 集塵装置、集塵装置の電極選定方法及び集塵方法 - Google Patents
集塵装置、集塵装置の電極選定方法及び集塵方法 Download PDFInfo
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- WO2014122756A1 WO2014122756A1 PCT/JP2013/052909 JP2013052909W WO2014122756A1 WO 2014122756 A1 WO2014122756 A1 WO 2014122756A1 JP 2013052909 W JP2013052909 W JP 2013052909W WO 2014122756 A1 WO2014122756 A1 WO 2014122756A1
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- dust
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- dust collector
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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
- B03C3/45—Collecting-electrodes
- B03C3/47—Collecting-electrodes flat, e.g. plates, discs, gratings
-
- 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
- B03C3/011—Prefiltering; Flow controlling
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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
-
- 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 has multiple serrated ends or parts
Definitions
- the present invention relates to a dust collector, an electrode selection method for the dust collector, and a dust collection method.
- exhaust gas containing dust (for example, particulate matter) and SOx is generated by combustion.
- an exhaust gas treatment facility is installed in the flue downstream of the combustion facility.
- the exhaust gas treatment facility is provided with a wet desulfurization device, a dust collection device, and the like.
- the wet desulfurization apparatus uses, for example, magnesium oxide (Mg (OH) 2 ) as an absorbent, and supplies the absorbent toward exhaust gas by spray spraying.
- Mg (OH) 2 magnesium oxide
- SOx is adsorbed on the absorbent
- SOx is removed from the exhaust gas.
- the dust collector includes a discharge electrode that charges the particulate matter, a dust collection electrode that is disposed to face the discharge electrode, and the like. When corona discharge occurs at the discharge electrode, the particulate matter contained in the exhaust gas is ionized. And the ionized particulate matter is collected by the dust collection electrode.
- Patent Document 1 in order to reliably collect particulate matter, the particulate matter is accelerated by ion wind in a direction crossing the gas flow in the casing, and the dust collection electrode has a predetermined aperture ratio through which the ion wind can pass. Discloses a technique for collecting particulate matter.
- ⁇ Bag filters have a surface flow velocity of 1 to 2 m / min, but are required to be 0.1 m / sec or more due to size reduction. In the case of a single wire mesh, the finer mesh has better collection performance. On the other hand, when the discharge electrode and the wire mesh are combined, the collection performance varies greatly according to the wire mesh, so it is necessary to check the operating conditions according to the wire mesh.
- the present invention has been made in view of such circumstances, and a dust collector, a collector that can improve the collection efficiency even at a high flow rate by appropriately selecting a wire mesh used for the dust collection electrode. It aims at providing the electrode selection method and dust collection method of a dust device.
- the dust collector according to the present invention includes a discharge electrode to which a voltage is applied, a plate-like member formed by a wire mesh, and a dust collection electrode that is installed to face the discharge electrode.
- IndexT (Distance between lines ⁇ 2) ⁇ Aperture ratio ⁇ Wire diameter x Surface flow velocity (1) IndexT ⁇ 2 (2)
- Equation (1) corresponds to the necessary horizontal movement speed when the particulate matter approaches one wire in the horizontal direction between the two wires of the wire mesh.
- the required horizontal movement speed is a speed necessary for the particulate matter to adhere to the wire mesh.
- the said invention WHEREIN You may further provide the filter material installed in the surface opposite to the surface in which the said discharge electrode was provided with respect to the said dust collection electrode. According to this configuration, the overall collection efficiency can be improved by further providing the filter material.
- An electrode selection method for a dust collector includes a discharge electrode to which a voltage is applied, and a dust collection electrode that has a plate-like member formed by a wire mesh and is disposed to face the discharge electrode.
- IndexT (Distance between lines ⁇ 2) ⁇ Aperture ratio ⁇ Wire diameter x Surface flow velocity (1) IndexT ⁇ 2 (2)
- the dust collection method includes a discharge electrode to which a voltage is applied, a plate-like member formed by a wire mesh, and a dust collection electrode that is installed to face the discharge electrode, and the plate shape
- IndexT (Distance between lines ⁇ 2) ⁇ Aperture ratio ⁇ Wire diameter x Surface flow velocity (1)
- the present invention it is possible to improve the collection efficiency even at a high flow rate by appropriately selecting the wire mesh used for the dust collection electrode.
- FIG. 1 It is a longitudinal cross-sectional view which shows the dust collector which concerns on one Embodiment of this invention. It is a disassembled perspective view which shows the discharge electrode and dust collection electrode of the dust collector which concern on one Embodiment of this invention. It is a schematic sectional drawing which shows two wire rods of a wire mesh. It is a schematic sectional drawing which shows two wire rods of a wire mesh. It is a graph which shows the relationship between required dust horizontal movement speed and collection efficiency. It is a graph which shows the relationship between collection efficiency and IndexT '. It is a graph which shows the relationship between collection efficiency and IndexT. It is an enlarged plan view showing a wire mesh of plain weave or twill. FIG.
- FIG. 3 is a plan view showing two plain weave wire meshes superimposed.
- FIG. 3 is a plan view showing two plain weave wire meshes superimposed.
- FIG. 2 is a cross-sectional view showing two plain weave wire meshes that are superimposed. It is sectional drawing which shows a flat woven wire mesh. It is a schematic diagram which shows the opening part and passage granule of a plain woven wire mesh.
- the dust collector 1 is installed in an exhaust gas treatment facility provided in a flue on the downstream side of an industrial combustion facility such as a coal-fired or heavy oil-fired power plant or an incinerator, for example.
- an industrial combustion facility such as a coal-fired or heavy oil-fired power plant or an incinerator, for example.
- the dust collector 1 can be used not only for industrial combustion equipment but also for air purification equipment filters (for example, clean room air conditioning filters, virus removal filters, etc.).
- the dust collector 1 includes a discharge electrode 2 for charging the particulate matter, a dust collection electrode 3 disposed opposite to the discharge electrode 2 and the like in order to remove particulate matter such as dust and mist.
- the discharge electrode 2 and the dust collection electrode 3 are installed in the casing 4.
- the discharge electrode 2 has a mounting frame 5 and a discharge barb 8.
- the discharge thorn 8 is installed on the mounting frame 5 and is installed in a thorn shape from the mounting frame 5 toward the dust collecting electrode 3.
- the attachment frame 5 is inclined with respect to the gas flow at the inlet.
- the upstream part of the gas flow of the dust collector 1 is located below the gravitational direction, and the downstream side of the gas flow is located above the gravitational direction.
- the mounting frame 5 is self-supporting on the discharge electrode support member 14 by combining the two mounting frames 5A and 5B. That is, the two mounting frames 5A and 5B support the load on the downstream side of the gas flow, and are installed so that the upstream side of the gas flow is wider than the downstream side of the gas flow.
- the two mounting frames 5A and 5B are installed with an increased interval on the upstream side of the gas flow so that the superficial velocity is 1 m / s to 4 m / s.
- the shape in which a plurality of mounting frames 5A and 5B are combined is a triangular prism, and the bottom surface portion is open on the upstream side of the gas flow, but the side surface is the mounting frame 5A. , 5B are provided.
- the dust collection electrode 3 has a plate-like member 6 formed of a wire mesh, and is installed facing the discharge electrode 2.
- the plate-like member 6 is inclined with respect to the gas flow at the inlet.
- the dust collecting electrode 3 is self-supporting on the discharge electrode support member 14 by combining two plate-like members 6.
- the two plate-like members 6 support the load on the downstream side of the gas flow, and are installed so that the upstream side of the gas flow is wider than the downstream side of the gas flow.
- the dust collection electrode 3 is located above the discharge electrode 2 and is installed so as to cover the discharge electrode 2. However, the discharge electrode 2 and the dust collection electrode 3 are separated from each other and are electrically insulated.
- the attachment frame 5 and the plate-like member 6 may be installed in a direction parallel to the installation surface of the dust collector 1, that is, in a horizontal direction, and fixed to the cantilever from the discharge electrode support member 14.
- the discharge electrode 2 is connected to a high voltage power source (not shown) through an insulator (not shown) fixed to the casing 4. By applying the discharge electrode 2, corona discharge occurs at the discharge electrode 2. The particulate matter contained in the exhaust gas is ionized by corona discharge. The ionized particulate matter is collected by the dust collection electrode 3.
- a filter material 7 is further provided on the surface of the dust collecting electrode 3 opposite to the surface on which the discharge electrode 2 is provided.
- the filter material 7 is a so-called medium performance filter or the like. By further providing the filter material 7, the collection efficiency of the entire dust collector 1 can be improved.
- the filter material 7 preferably has finer specifications than the wire mesh.
- the material of the filter material 7 is not particularly limited.
- the corona discharge is generated in the discharge electrode 2, whereby the particulate matter contained in the exhaust gas is ionized,
- the ionized particulate matter is collected by the dust collection electrode 3.
- the mounting frame 5 of the two discharge electrodes 2 supports the load on the downstream side of the gas flow, and is installed so that the upstream side of the gas flow is wider than the downstream side of the gas flow. 2 can be self-supporting only by support from the bottom, and support at the top is unnecessary. Furthermore, since it is diagonal to the flow direction of the gas flow and the downstream side of the gas flow is wide, an increase in the flow velocity at the gas inflow portion can be reduced.
- the plate-like member 6 of the dust collecting electrode 3 is inclined with respect to the gas flow at the inlet portion, the ionized particulate form is used regardless of the upstream side and the downstream side of the gas flow.
- the substance surely passes through the dust collecting electrode 3.
- the two plate-like members 6 of the dust collecting electrode 3 support the load on the downstream side of the gas flow, and are installed so that the upstream side of the gas flow is wider than the downstream side of the gas flow.
- the shaped member 6 can be self-supporting only by support from the lower part, and support at the upper part is unnecessary. Furthermore, since it is slanting with respect to the flow direction of the gas flow and the downstream side of the gas flow is wide, an increase in the flow velocity at the gas inflow portion can be reduced.
- the mounting frame 5 of the discharge electrode 2 and the shape of the longitudinal section of the plate-like member 6 of the dust collecting electrode 3 are triangular has been described, but the present invention is not limited to this example.
- the vertical cross-sectional shape of the mounting frame 5 of the discharge electrode 2 and the plate-like member 6 of the dust collecting electrode 3 may be a polygon other than a triangle (for example, a trapezoid, a pentagon, etc.).
- the structure of the discharge electrode 2 and the dust collection electrode 3 is not restricted to the shape mentioned above. That is, the discharge electrode 2 and the dust collection electrode 3 are not limited to the case where the discharge electrode 2 and the dust collection electrode 3 are oblique to the gas flow direction, and may be installed in parallel to the gas flow direction.
- the dust collector 1 is generally faster than a bag filter having a flow velocity of about 1 m / min or less, and is about 6 m / min (0.1 m / sec) or more. Therefore, when a wire mesh having a predetermined aperture ratio is used for the dust collection electrode 3 of the dust collector 1, the collection efficiency is lowered depending on the opening shape of the wire mesh or the wire diameter of the wire mesh.
- the inventors made extensive studies in order to select a wire mesh with good collection efficiency, and the following findings were obtained. And the collection efficiency of the dust collector 1 can be improved by using the metal mesh which satisfy
- dust particulate matter passing through the wire mesh passes between the wire mesh wires 10
- the specification items of the wire mesh include the weaving method of the wire material such as plain weave, twill weave, and flat tatami weave, the distance between the wires, and the wire diameter.
- the required dust horizontal moving speed is a speed necessary for dust to pass through the dust attaching portion and adhere to the wire mesh, and the horizontal direction is a direction parallel to the direction connecting the wire rods 10.
- the graph of FIG. 5 shows the relationship between the required dust horizontal movement speed of each wire mesh and the collection efficiency when dust is collected using various wire meshes in the dust collector 1.
- the collection efficiency when one plain weave 14 mesh and the surface flow velocity is 1.0 m / s is greatly reduced. Therefore, it can be inferred that the actual dust horizontal movement speed is 2.2 m / s or more and less than 2.6 m / s. That is, when the required dust horizontal moving speed is 2.6 m / s and one plain weave 14 mesh and the surface flow velocity is 1.0 m / s, it is faster than the actual dust horizontal moving speed (2.2 m / s or more and less than 2.6 m / s).
- the dust horizontal movement speed is required, it can be said that the dust hardly adheres to the wire mesh wire 10 and slips through. Therefore, it can be seen from the graph of FIG. 5 that the collection efficiency is improved if the wire mesh whose required dust horizontal movement speed calculated from the wire mesh shape and the surface flow velocity is smaller than the actual dust horizontal movement speed. This can be presumed to be due to an increase in the number of portions attached to the wire diameter of the wire (see FIG. 4).
- the collection efficiency can be estimated if the required dust horizontal movement speed is known based on the shape and surface flow velocity of each wire mesh.
- the threshold value of the required dust horizontal movement speed is 2.2 m / s or more and less than 2.6 m / s, and the smaller the value, the better the collection efficiency.
- the collection efficiency is about 50% or more.
- IndexT (Distance between lines ⁇ 2) ⁇ Aperture ratio ⁇ Wire diameter x Surface flow velocity (1) IndexT ⁇ 2 (2)
- the opening ratio is a value obtained by the opening area of the wire mesh ⁇ the wire mesh flat area
- the surface flow velocity is the gas amount ⁇ the wire mesh flat area.
- the collection efficiency is about 60% or more, and for example, if IndexT ⁇ 1.5, the collection efficiency is about 70% or more. That is, the collection efficiency can be improved as the IndexT is smaller.
- the calculation method of the distance between lines and the aperture ratio differs depending on the weaving method (plain weave, twill weave, plain tatami weave, etc.).
- the distance between the lines is set to the minimum opening A of the opening through which gas passes.
- the length on the short side is the distance between the lines.
- FIG. 9 shows an example in which the plain weave wire mesh is shifted in the Y direction
- FIG. 10 shows an example in which the plain weave wire mesh is shifted in the X direction and the Y direction.
- the distance between two plain weaves is calculated from the opening of one plain weave and the distance between the wires of each layer generated when they are overlapped.
- the distance between the lines is the particle size R of the passing particle sphere (reference value), which is a characteristic of each plain woven wire mesh.
- the area through which the particles pass when obtaining the aperture ratio ⁇ (%) is 4 openings P (regular triangles) between the pitches of the thin wire 10A (see FIG. 12) and between the two thick wires 10B. Focusing on the location, it was set to (regular triangle ⁇ 4 derived from the diameter of passing particle sphere).
- the diameter of the passing particle sphere is R
- the wire mesh preferably satisfies the following formulas (1) and (2).
- IndexT (Distance between lines ⁇ 2) ⁇ Aperture ratio ⁇ Wire diameter x Surface flow velocity (1) IndexT ⁇ 2 (2)
- Expression (1) corresponds to the required dust horizontal movement speed when dust approaches one wire in the horizontal direction between the two wires 10 of the wire mesh.
- the required dust horizontal moving speed is a speed necessary for dust to pass through the dust adhering portion and adhere to the wire mesh, as described above.
- the wire mesh satisfies the expressions (1) and (2), it becomes a condition suitable for dust to adhere to the surface of the wire of the wire mesh in the plate-like member 6 of the dust collection electrode 3. Collection efficiency is improved.
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- Electrostatic Separation (AREA)
Abstract
Description
集塵装置は、ダストを除去するため、粒子状物質を帯電させる放電電極と、放電電極に対向して配置される集塵電極などを備える。放電電極でコロナ放電が生じることによって、排ガス中に含まれる粒子状物質は、イオン化する。そして、イオン化した粒子状物質は、集塵電極に捕集される。
特許文献1では、粒子状物質を確実に捕集するため、イオン風によってケーシング中のガス流れを横切る方向へ粒子状物質を加速し、イオン風が通過可能な所定の開口率を有する集塵電極で粒子状物質を捕集する技術が開示されている。
前記板状部材の前記金網は、下記の式(1)、式(2)を満たし、前記金網を通過する面流速vは、v=0.1m/s以上である。
IndexT=(線間距離÷2)÷開口率÷線径×面流速 ・・・・・・(1)
IndexT≦2 ・・・・・・(2)
このとき、金網が式(1)、式(2)を満たすことによって、集塵電極の板状部材における金網の線材表面において粒子状物質が付着するのに適した条件となり、集塵電極における捕集効率が向上する。
この構成によれば、フィルタ材が更に設けられることで、全体の捕集効率を向上させることができる。
前記板状部材の前記金網は、下記の式(1)、式(2)を満たし、前記金網を通過する面流速vは、v=0.1m/s以上であるように選定される。
IndexT=(線間距離÷2)÷開口率÷線径×面流速 ・・・・・・(1)
IndexT≦2 ・・・・・・(2)
IndexT=(線間距離÷2)÷開口率÷線径×面流速 ・・・・・・(1)
IndexT≦2 ・・・・・・(2)
本実施形態に係る集塵装置1は、例えば、石炭焚きや重油焚きの発電プラントや焼却炉等の産業用燃焼設備の下流側の煙道内に設けられる排ガス処理設備に設置される。また、集塵装置1は、産業用燃焼設備以外に、空気浄化設備用フィルタ(例えば、クリーンルーム用空調フィルタ、ウィルス除去用フィルタ等)等にも使用できる。
取付枠5は、入口部のガス流れに対して傾斜している。ここで、集塵装置1のガス流れの上流部が重力方向下方に位置し、ガス流れの下流側が重力方向上方に位置する。取付枠5は、二つの取付枠5A,5Bを組み合わせて放電極支持材14上に自立している。すなわち、二つの取付枠5A,5Bが、ガス流れの下流側で互いに荷重を支持し、ガス流れの上流側がガス流れの下流側に比べ広くなるように設置されている。例えば、二つの取付枠5A,5Bは、空塔速度が1m/s~4m/sとなるように、ガス流れ上流側の間隔を広げて設置される。図1及び図2に示す例では、複数の取付枠5A,5Bを組み合わせて配置した形状が三角柱であり、底面部がガス流れの上流側であって開口しているが、側面は取付枠5A,5Bが設けられる。
集塵電極3は、板状部材6が入口部のガス流れに対して傾斜している。集塵電極3は、2枚の板状部材6を組み合わせて放電極支持材14上に自立している。2枚の板状部材6が、ガス流れの下流側で互いに荷重を支持し、ガス流れの上流側がガス流れの下流側に比べ広くなるように設置されている。
集塵電極3は、放電電極2の上方に位置して、放電電極2を覆うように設置されているが、放電電極2と集塵電極3は互いに離隔され、電気的に絶縁されている。
集塵電極3の2枚の板状部材6が、ガス流れの下流側で互いに荷重を支持し、ガス流れの上流側がガス流れの下流側に比べ広くなるように設置されていることから、板状部材6は下部からの支持のみで自立可能であり、上部における支持が不要である。さらに、ガス流れの流れ方向に対して斜めであり、ガス流れの下流側が広いので、ガス流入部における流速の上昇を低減することができる。
集塵装置1は、一般に、流速が約1m/min以下のバグフィルタに比べて速く、約6m/min(0.1m/sec)以上である。したがって、集塵装置1の集塵電極3について、所定の開口率を有する金網を使用した場合、金網の開口形状や金網の線径などによっては、捕集効率が低下してしまう。
発明者らは、捕集効率の良い金網を選定するため、鋭意検討したところ、以下のような知見が得られた。そして、発明者らの知見に基づく所定条件を満たす金網を集塵電極3として用いることによって、集塵装置1の捕集効率を高めることができる。
実際のダスト水平移動速度は、金網の仕様やガス流速に関わらず、一定と考えられる。電界強度(=荷電電圧/距離)が一定であれば、荷電によるクーロン力も一定であるためである。金網の仕様項目としては、平織、綾織、平畳織などの線材の織り方、線間距離、線径などがある。
必要ダスト水平移動速度は、以下の式で表される。
必要ダスト水平移動速度=((線間距離÷2)×実流速)÷線径
ここで、実流速=面流速÷開口率である。
このグラフによれば、平織14メッシュ1枚かつ面流速1.0m/sのときの捕集効率が大きく低下している。したがって、実際のダスト水平移動速度は、2.2m/s以上2.6m/s未満であることが推測できる。すなわち、必要ダスト水平移動速度が2.6m/sとなる平織14メッシュ1枚かつ面流速1.0m/sの場合、実際のダスト水平移動速度(2.2m/s以上2.6m/s未満)よりも速いダスト水平移動速度が要求されるため、ダストは金網の線材10にほとんど付着せず、すり抜けてしまうといえる。
よって、図5のグラフより、金網形状と面流速から算出される必要ダスト水平移動速度が実際のダスト水平移動速度よりも小さくなる金網であれば、捕集効率が良くなることが分かる。これは、線材の線径に付着する部分が多くなるためと推測できる(図4参照)。
必要ダスト水平移動速度=((線間距離÷2)÷開口率)÷線径×面流速
とも表される。したがって、必要ダスト水平移動速度は、面流速に比例する。したがって、捕集効率とIndexT'(無次元)との関係を示すグラフを面流速別にプロットすると、図6のようになる。ここで、IndexT'は、下式で表される。
IndexT'=(線間距離÷2)÷開口率÷線径
さらに、無次元数IndexT'に面流速を乗じた値であるIndexTと捕集効率の関係を示すグラフは、図7のようになる。このグラフによれば、捕集効率が推定しやすい。
IndexT=(線間距離÷2)÷開口率÷線径×面流速 ・・・・・・(1)
IndexT≦2 ・・・・・・(2)
ここで、開口率とは、金網の開口部面積÷金網平面積で得られる値であり、面流速とは、ガス量÷金網平面積である。
平織又は綾織等の金網の場合、線間距離は、ガスが通過する開口部の最小目開きAとした。図8に示すように、開口部が長辺と短辺がある場合、短辺側長さが線間距離である。
平織又は綾織等の金網の場合、目開きA(mm)は、
A(mm)=(金網の線材ピッチ)-(線径)=25.4/MESH-d
で表され、開口率ε(%)は、
ε(%)={(開口部の面積)/(金網の面積)}×100={(目開きの2乗)/(ピッチの2乗)}×100=(A/(A+d))2×100
で表される。
ε(%)=(粒子が通過する面積)/(金網の面積)=(通過粒球子径から導出した正三角形×4)/{(細い線材の線径×2)×(25.4÷太い線径のメッシュピッチ)}
と表される。通過粒球子径をRとしたとき、正三角形の面積は、
底辺√3R×高さ3R/2÷2=(3√3×R2)/4
と表される。
例えば、平畳織50メッシュの場合、開口率ε(%)は、
ε(%)={(3√3×0.362)/4×4}×{(0.55×2)×(25.4÷10)}×100=24.1%
であり、平畳織100メッシュの場合、開口率ε(%)は、
ε(%)={(3√3×0.22)/4×4}×{(0.28×2)×(25.4÷16)}×100=23.4%
である。
IndexT=(線間距離÷2)÷開口率÷線径×面流速 ・・・・・・(1)
IndexT≦2 ・・・・・・(2)
このとき、金網が式(1)、式(2)を満たすことによって、集塵電極3の板状部材6における金網の線材表面においてダストが付着するのに適した条件となり、集塵電極3における捕集効率が向上する。
2 放電電極
3 集塵電極
4 ケーシング
5 取付枠
6 板状部材
7 フィルタ材
8 放電トゲ
14 放電極支持材
Claims (4)
- 電圧が印加される放電電極と、
金網によって形成された板状部材を有し、前記放電電極に対向して設置される集塵電極と、
を備え、
前記板状部材の前記金網は、下記の式(1)、式(2)を満たし、
前記金網を通過する面流速vは、v=0.1m/s以上である集塵装置。
IndexT=(線間距離÷2)÷開口率÷線径×面流速 ・・・・・・(1)
IndexT≦2 ・・・・・・(2) - 前記集塵電極に対して前記放電電極が設けられた面とは反対の面側に設置されたフィルタ材を更に備える請求項1に記載の集塵装置。
- 電圧が印加される放電電極と、
金網によって形成された板状部材を有し、前記放電電極に対向して設置される集塵電極と、
を備える集塵装置の電極選定方法であって、
前記板状部材の前記金網は、下記の式(1)、式(2)を満たし、
前記金網を通過する面流速vは、v=0.1m/s以上であるように選定される集塵装置の電極選定方法。
IndexT=(線間距離÷2)÷開口率÷線径×面流速 ・・・・・・(1)
IndexT≦2 ・・・・・・(2) - 電圧が印加される放電電極と、金網によって形成された板状部材を有し、前記放電電極に対向して設置される集塵電極とを備え、前記板状部材の前記金網は、下記の式(1)、式(2)を満たし、前記金網を通過する面流速vは、v=0.1m/s以上である集塵装置を用いて、粒子状物質を捕集する集塵方法。
IndexT=(線間距離÷2)÷開口率÷線径×面流速 ・・・・・・(1)
IndexT≦2 ・・・・・・(2)
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JP7109194B2 (ja) * | 2018-01-15 | 2022-07-29 | 三菱重工パワー環境ソリューション株式会社 | 電気集塵装置 |
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