Dust collector, electrode selection method for dust collector, and dust collection method
View Patent ↗The purpose of the present invention is to provide a dust collector, an electrode selection method for a dust collector, and a dust collection method such that it is possible to select a suitable wire mesh to be used in a collecting electrode and thereby improve the collecting efficiency even at high flow velocities. A dust collector has a discharge electrode to which a voltage is applied, and a collecting electrode that is disposed facing the discharge electrode and has a planar member formed of a wire mesh, wherein the wire mesh of the planar member satisfies equations <1> and <2> below, and the gas face velocity (v) of the gas penetrating the wire mesh is v=0.1 m/s or higher. <1> IndexT=(the inter-wire distance÷2)÷the opening ratio÷the wire diameter×the gas face velocity <2> IndexT≦2.
1. A dust collector comprising:
a discharge electrode configured to have a voltage applied thereto; and
a collecting electrode having a planar member formed of a wire mesh and disposed facing the discharge electrode; wherein
the wire mesh of the planar member satisfies equations (1) and (2) below, and a gas face velocity v of penetrating the wire mesh is such that v=not less than 0.1 m/s:
Index T =(inter-wire distance÷2)÷opening ratio+wire diameter×gas face velocity v, (1)
Index T ≦2, (2)
wherein a unit of IndexT is m/s,
wherein, when the wire mesh is a plain-woven or twill-woven wire mesh, the inter-wire distance is set as a minimum aperture A of an opening which gas penetrates, the aperture A being expressed as: A=(wire pitch of the wire mesh)−(wire diameter), or when the wire mesh is a plain dutch woven wire mesh, the inter-wire distance is set as a particle diameter R of a penetrating spherical particle,
wherein, when the wire mesh is the plain-woven or twill-woven wire mesh, the opening ratio is a value obtained by (opening area of the wire mesh)/(area of the wire mesh), or when the wire mesh is the plain dutch woven wire mesh, the opening ratio is a value obtained by (area which the particle penetrates)/(area of the wire mesh),
wherein the gas face velocity v is a value obtained by (amount of gas)/(area of the wire mesh).
2. The dust collector according to claim 1 , further comprising a filter material that is disposed on a surface side of the collecting electrode opposite to a surface of the collecting electrode facing the discharge electrode.
3. A method of electrode selection for a dust collector, the dust collector including a discharge electrode configured to have a voltage applied thereto and a collecting electrode having a planar member formed of a wire mesh and disposed facing the discharge electrode, the method comprising the step of:
performing a selection of the wire mesh so that the wire mesh of the planar member satisfies equations (1) and (2) below, and a gas face velocity v of penetrating the wire mesh is such that v=not less than 0.1 m/s:
Index T =(inter-wire distance÷2)÷opening ratio÷wire diameter×gas face velocity v, (1)
Index T ≦2, (2)
wherein a unit of IndexT is m/s,
wherein, when the wire mesh is a plain-woven or twill-woven wire mesh, the inter-wire distance is set as a minimum aperture A of an opening which gas penetrates, the aperture A being expressed as: A=(wire pitch of the wire mesh)−(wire diameter), or when the wire mesh is a plain dutch woven wire mesh, the inter-wire distance is set as a particle diameter R of a penetrating spherical particle,
wherein, when the wire mesh is the plain-woven or twill-woven wire mesh, the opening ratio is a value obtained by (opening area of the wire mesh)/(area of the wire mesh), or when the wire mesh is the plain dutch woven wire mesh, the opening ratio is a value obtained by (area which the particle penetrates)/(area of the wire mesh),
wherein the gas face velocity v is a value obtained by (amount of gas)/(area of the wire mesh).
4. A dust collection method comprising the step of collecting particulate material using a dust collector, the dust collector including a discharge electrode configured to have a voltage applied thereto and a collecting electrode having a planar member formed of a wire mesh and disposed facing the discharge electrode, wherein
the wire mesh of the planar member satisfies equations (1) and (2) below, and a gas face velocity v of penetrating the wire mesh is such that v=not less than 0.1 m/s:
Index T =(inter-wire distance÷2)÷opening ratio÷wire diameter×gas face velocity v, (1)
Index T ≦2, (2)
wherein a unit of IndexT is m/s,
wherein, when the wire mesh is a plain-woven or twill-woven wire mesh, the inter-wire distance is set as a minimum aperture A of an opening which gas penetrates, the aperture A being expressed as: A=(wire pitch of the wire mesh)−(wire diameter), or when the wire mesh is a plain dutch woven wire mesh, the inter-wire distance is set as a particle diameter R of a penetrating spherical particle,
wherein, when the wire mesh is the plain-woven or twill-woven wire mesh, the opening ratio is a value obtained by (opening area of the wire mesh)/(area of the wire mesh), or when the wire mesh is the plain dutch woven wire mesh, the opening ratio is a value obtained by (area which the particle penetrates)/(area of the wire mesh),
wherein the gas face velocity v is a value obtained by (amount of gas)/(area of the wire mesh).