Method and apparatus for filtering gases containing fine particles and cleaning a filter cloth of collected particles

Claim 1

A method of filtering fine particles, particularly adherent particles, from gases, and cleaning a filter cloth of collected particles, the method comprising the steps of: (a) passing a gas containing particles to be filtered through a filter cloth in a collecting vessel from an outer side to an inner side of the filter cloth, the particles being filtered forming a filter cake on the outer side of the filter cloth; and (b) cleaning the filter cake formed on the outer side of the filter cloth with an overall amplified high-speed cleaning gas flow by using a gas passage formed and lying substantially parallel along the outer side of the filter cloth, the gas passage having inlet and outlet ends and having the outer side of the filter cloth as one wall thereof, the cleaning step including (i) momentarily jetting a pressurized high-speed cleaning gas toward the inlet end of the gas passage from an open space in the collecting vessel upstream of the inlet end of the gas passage; (ii) mixing additional gas existing at the open space in the collecting vessel upstream of the inlet end of the gas passage with the jetted cleaning gas due to the pneumatic ejector effect of the high-speed cleaning gas; and (iii) providing the overall amplified high-speed cleaning gas flow formed by the jetted mixed gas through the gas passage past the outer side of the filter cloth having the filter cake.

Claim 2

A method of filtering fine particles, particularly adherent particles, from gases, and cleaning a filter cloth of collected particles, the method comprising the steps of: (a) passing a gas containing particles to be filtered through a filter cloth in a collecting vessel from an outer side to an inner side of the filter cloth, the particles being filtered forming a filter cake on the outer side of the filter cloth; and (b) cleaning the filter cake formed on the outer side of the filter cloth with an overall amplified high-speed cleaning gas flow by using a gas passage formed and lying substantially parallel along the outer side of the filter cloth, the gas passage having inlet and outlet ends and having the outer side of the filter cloth as one wall thereof, the cleaning step including (i) momentarily jetting a pressurized high-speed cleaning gas toward the inlet end of the gas passage from an open space in the collecting vessel upstream of the inlet end of the gas passage; (ii) mixing additional gas existing at the open space in the collecting vessel upstream of the inlet end of the gas passage with the jetted cleaning gas due to the pneumatic ejector effect of the high-speed cleaning gas; and (iii) providing the overall amplified high-speed cleaning gas flow formed by the jetted mixed gas through the gas passage past the outer side of the filter cloth having the filter cake.

Claim 6

An apparatus for filtering fine particles, particularly adherent particles, from gases, and cleaning a filter cloth of collected particles, the apparatus comprising: (a) a filter cloth having an outer side and inner side; (b) a collecting vessel housing having a gas inlet and a gas outlet and containing the filter cloth, the filter cloth being positioned in the housing; a guide member positioned in the housing adjacent the outer side of the filter cloth such that a gas passage is formed substantially parallel along the outer side of the filter cloth and said guide member and which has side walls and inlet and outlet ends thereto with one side wall of the gas passage defined by the outer side of the filter cloth, and wherein the gas to be filtered passes through the filter cloth from the outer side to the inner side thereof; and (c) pressurized cleaning gas supply means for emitting a jetted gas stream into the housing in such a manner that an overall amplified cleaning gas flow passes through the gas passage substantially parallel along the outer side of the filter cloth, wherein the pressurized cleaning gas supply means has an inlet opening into the housing at an open space upstream of and adjoining the inlet end of the gas passage for pneumatically drawing additional, existing gas inside the housing and entraining the additional gas with the jetted cleaning gas stream before the mixed gas flows through the gas passage past the outer side of the filter cloth as the overall amplified cleaning gas flow.

Claim 7

An apparatus for filtering fine particles, particularly adherent particles, from gases, and cleaning a filter cloth of collected particles, the apparatus comprising: (a) a filter cloth having an outer side and inner side; (b) a collecting vessel housing having a gas inlet and a gas outlet and containing the filter cloth, the filter cloth being positioned in the housing; a guide member positioned in the housing adjacent the outer side of the filter cloth such that a gas passage is formed substantially parallel along the outer side of the filter cloth and said guide member and which has side walls and inlet and outlet ends thereto with one side wall of the gas passage defined by the outer side of the filter cloth, and wherein the gas to be filtered passes through the filter cloth from the outer side to the inner side thereof; and (c) pressurized cleaning gas supply means for emitting a jetted gas stream into the housing in such a manner that an overall amplified cleaning gas flow passes through the gas passage substantially parallel along the outer side of the filter cloth, wherein the pressurized cleaning gas supply means has an inlet opening into the housing at an open space upstream of and adjoining the inlet end of the gas passage for pneumatically drawing additional, existing gas inside the housing and entraining the additional gas with the jetted cleaning gas stream before the mixed gas flows through the gas passage past the outer side of the filter cloth as the overall amplified cleaning gas flow.

Claim 11

A method of filtering gases containing fine particles, particularly adherent particles, from gases, and cleaning a filter cloth of collected particles, the method comprising the steps of: (a) passing a gas containing particles to be filtered through a filter cloth in a collecting vessel from an outer side to an inner side of the filter cloth, the particles being filtered forming a filter cake on the outer side of the filter cloth; and (b) cleaning the filter cake formed on the outer side of the filter cloth with an overall amplified high-speed cleaning gas flow by using a gas passage formed and lying substantially parallel along the outer side of the filter cloth, the gas passage having inlet and outlet ends and having the outer side of the filter cloth as one wall thereof and with a backwashing gas flow, the cleaning step including (i) momentarily jetting a pressurized high-speed cleaning gas toward the inlet end of the gas passage from an open space in the collecting vessel upstream of the inlet end of the gas passage; (ii) mixing additional gas prevailing at the open space in the collecting vessel upstream of the inlet end of the gas passage with the jetted cleaning gas due to the pneumatic ejector effect of the high-speed cleaning gas; (iii) providing the overall amplified high-speed cleaning gas flow formed by the jetted mixed gas through the gas passage past the outer side of the filter cloth having the filter cake; and (iv) concurrently with cleaning step (iii) hereof, momentarily jetting a backwash pressurized gas toward the inner side of the filter cloth.

Claim 12

A method of filtering gases containing fine particles, particularly adherent particles, from gases, and cleaning a filter cloth of collected particles, the method comprising the steps of: (a) passing a gas containing particles to be filtered through a filter cloth in a collecting vessel from an outer side to an inner side of the filter cloth, the particles being filtered forming a filter cake on the outer side of the filter cloth; and (b) cleaning the filter cake formed on the outer side of the filter cloth with an overall amplified high-speed cleaning gas flow by using a gas passage formed and lying substantially parallel along the outer side of the filter cloth, the gas passage having inlet and outlet ends and having the outer side of the filter cloth as one wall thereof and with a backwashing gas flow, the cleaning step including (i) momentarily jetting a pressurized high-speed cleaning gas toward the inlet end of the gas passage from an open space in the collecting vessel upstream of the inlet end of the gas passage; (ii) mixing additional gas prevailing at the open space in the collecting vessel upstream of the inlet end of the gas passage with the jetted cleaning gas due to the pneumatic ejector effect of the high-speed cleaning gas; (iii) providing the overall amplified high-speed cleaning gas flow formed by the jetted mixed gas through the gas passage past the outer side of the filter cloth having the filter cake; and (iv) concurrently with cleaning step (iii) hereof, momentarily jetting a backwash pressurized gas toward the inner side of the filter cloth.

Claim 15

An apparatus for filtering fine particles, particularly adherent particles, from gases, and cleaning a filter cloth of collected particles, the apparatus comprising: (a) a filter cloth having an outer side and inner side; (b) a collecting vessel housing having a gas inlet and a gas outlet and containing the filter cloth, the filter cloth being positioned in the housing, a guide member positioned in the housing adjacent the outer said of the filter cloth such that a gas passage is formed substantially parallel along the outer side of the filter cloth and said guide member and which has side walls and inlet and outlet ends thereto with one side wall of the gas passage defined by the outer side of the filter cloth, and wherein the gas to be filtered passes through the filter cloth from the outer side to the inner side thereof; (c) pressurized cleaning gas supply means for emitting a jetted gas stream into the housing in such a manner that an overall amplified cleaning gas flow passes through the gas passage substantially parallel along the outer side of the filter cloth, wherein the pressurized cleaning gas supply means has an inlet opening into the housing at an open space upstream of and adjoining the inlet end of the gas passage for pneumatically drawing additional, existing gas inside the housing and entraining the additional gas with the jetted cleaning gas stream before the mixed gas flows through the gas passage past the outerside of the filter cloth as the overall amplified cleaning gas; and (d) means for jetting a pressurized gas toward the inner side of the filter cloth simultaneously with the emitting of the jetted gas stream from the pressurized cleaning gas supply means.

Claim 16

An apparatus for filtering fine particles, particularly adherent particles, from gases, and cleaning a filter cloth of collected particles, the apparatus comprising: (a) a filter cloth having an outer side and inner side; (b) a collecting vessel housing having a gas inlet and a gas outlet and containing the filter cloth, the filter cloth being positioned in the housing, a guide member positioned in the housing adjacent the outer said of the filter cloth such that a gas passage is formed substantially parallel along the outer side of the filter cloth and said guide member and which has side walls and inlet and outlet ends thereto with one side wall of the gas passage defined by the outer side of the filter cloth, and wherein the gas to be filtered passes through the filter cloth from the outer side to the inner side thereof; (c) pressurized cleaning gas supply means for emitting a jetted gas stream into the housing in such a manner that an overall amplified cleaning gas flow passes through the gas passage substantially parallel along the outer side of the filter cloth, wherein the pressurized cleaning gas supply means has an inlet opening into the housing at an open space upstream of and adjoining the inlet end of the gas passage for pneumatically drawing additional, existing gas inside the housing and entraining the additional gas with the jetted cleaning gas stream before the mixed gas flows through the gas passage past the outerside of the filter cloth as the overall amplified cleaning gas; and (d) means for jetting a pressurized gas toward the inner side of the filter cloth simultaneously with the emitting of the jetted gas stream from the pressurized cleaning gas supply means.

Claim 17

An apparatus for filtering fine particles, particularly adherent particles, from gases, and cleaning a filter cloth of collected particles, the apparatus comprising: (a) a fluted filter cloth having gaps between the mutually adjacent portions of the fluted filter cloth to form outer sides and inner sides; (b) a collecting vessel housing having a gas inlet and a gas outlet and containing the fluted filter cloth, the fluted filter cloth being positioned in the housing, wherein the gaps formed between the mutually adjacent portions of the fluted filter cloth define gas passages lying substantially parallel along the outer sides of the fluted filter cloth and having inlet and outlet ends, and wherein the gas to be filtered passes through the fluted filter cloth from the outer sides of the inner sides thereof; and (c) pressurized cleaning gas supply means for emitting a jetted gas stream into the housing in such a manner that an overall amplified cleaning gas flow passes through the gas passages formed by the gaps of the fluted filter cloth substantially parallel along the outer sides of the fluted filter cloth, wherein the pressurized cleaning gas supply means has an inlet opening into the housing at an open space upstream of and adjoining the inlet ends of the gas passages for pneumatically drawing additional, existing gas inside the housing and entraining the additional gas with the jetted cleaning gas stream before the mixed gas flows through the gas passages past the outer sides of the fluted filter cloth as the overall amplified cleaning gas flow.

Claim 18

An apparatus for filtering fine particles, particularly adherent particles, from gases, and cleaning a filter cloth of collected particles, the apparatus comprising: (a) a fluted filter cloth having gaps between the mutually adjacent portions of the fluted filter cloth to form outer sides and inner sides; (b) a collecting vessel housing having a gas inlet and a gas outlet and containing the fluted filter cloth, the fluted filter cloth being positioned in the housing, wherein the gaps formed between the mutually adjacent portions of the fluted filter cloth define gas passages lying substantially parallel along the outer sides of the fluted filter cloth and having inlet and outlet ends, and wherein the gas to be filtered passes through the fluted filter cloth from the outer sides of the inner sides thereof; and (c) pressurized cleaning gas supply means for emitting a jetted gas stream into the housing in such a manner that an overall amplified cleaning gas flow passes through the gas passages formed by the gaps of the fluted filter cloth substantially parallel along the outer sides of the fluted filter cloth, wherein the pressurized cleaning gas supply means has an inlet opening into the housing at an open space upstream of and adjoining the inlet ends of the gas passages for pneumatically drawing additional, existing gas inside the housing and entraining the additional gas with the jetted cleaning gas stream before the mixed gas flows through the gas passages past the outer sides of the fluted filter cloth as the overall amplified cleaning gas flow.

Claim 21

An apparatus for filtering fine particles, particularly adherent particles, from gases, and cleaning a filter cloth of collected particles, the apparatus comprising: (a) a plurality of filter units, each filter unit having two substantially flat surfaces at least one of which is formed of a filter cloth with an outer side and an inner side, said filter units being arranged side-by-side with mutually adjacent flat surfaces disposed substantially in parallel with a gap formed therebetween; (b) a collecting vessel housing having a gas inlet and a gas outlet and containing the filter units, the filter units being positioned in the housing, wherein the gaps formed between the flat surfaces of the filter units define gas passages lying substantially parallel along the outer sides of the filter cloth and having inlet and outlet ends, and wherein the gas to be filtered passes through the filter cloths from the outer sides to the inner sides thereof; and (c) pressurized cleaning gas supply means for emitting a jetted gas stream into the housing in such a manner that an overall amplified cleaning gas flow passes through the gas passages formed by the gaps of the filter units substantially parallel along the outer sides of the filter cloths, wherein the pressurized cleaning gas supply means has an inlet opening into the housing at an open space upstream of and adjoining the inlet ends of the gas passages for pneumatically drawing aditional, existing gas inside the housing and entraining the additional gas with the jetted cleaning gas stream before the mixed gas flows through the gas passage past the outer sides of the filter cloths as the overall amplified cleaning gas flow.

Claim 22

An apparatus for filtering fine particles, particularly adherent particles, from gases, and cleaning a filter cloth of collected particles, the apparatus comprising: (a) a plurality of filter units, each filter unit having two substantially flat surfaces at least one of which is formed of a filter cloth with an outer side and an inner side, said filter units being arranged side-by-side with mutually adjacent flat surfaces disposed substantially in parallel with a gap formed therebetween; (b) a collecting vessel housing having a gas inlet and a gas outlet and containing the filter units, the filter units being positioned in the housing, wherein the gaps formed between the flat surfaces of the filter units define gas passages lying substantially parallel along the outer sides of the filter cloth and having inlet and outlet ends, and wherein the gas to be filtered passes through the filter cloths from the outer sides to the inner sides thereof; and (c) pressurized cleaning gas supply means for emitting a jetted gas stream into the housing in such a manner that an overall amplified cleaning gas flow passes through the gas passages formed by the gaps of the filter units substantially parallel along the outer sides of the filter cloths, wherein the pressurized cleaning gas supply means has an inlet opening into the housing at an open space upstream of and adjoining the inlet ends of the gas passages for pneumatically drawing aditional, existing gas inside the housing and entraining the additional gas with the jetted cleaning gas stream before the mixed gas flows through the gas passage past the outer sides of the filter cloths as the overall amplified cleaning gas flow.