Patents Assigned to BHA Group, Inc.
  • Patent number: 8038776
    Abstract: An inlet air filtration system for a gas turbine includes, in an exemplary embodiment, an air plenum, and a plurality of filter elements mounted inside the air plenum, with each filter element including a support structure. The inlet air filtration system also includes a plurality of electrodes positioned proximate the plurality of filter elements, where the electrodes are coupled to a power source which supplies a voltage to the electrodes. The voltage is sufficient to establish an electrostatic field between the electrodes and the filter elements, and is sufficient to produce a corona discharge from the electrodes, wherein an amount of current applied to the filter elements is about 0.1 ?A/ft2 to about 15 ?A/ft2.
    Type: Grant
    Filed: March 23, 2010
    Date of Patent: October 18, 2011
    Assignee: BHA Group, Inc.
    Inventors: Jamison W. Janawitz, Bradley S. Rogers, James Easel Roberts, Thomas Shannon Eckhoff, Robert W. Taylor
  • Patent number: 8029607
    Abstract: A system for cleaning at least one filter in a baghouse and an associated method for providing the system. The at least one filter separate a dirty gas chamber from a clean gas chamber, and filters at least one substance from a gas. The system includes a supply of compressed air and a blowpipe to direct the air at the at least one filter to dislodge a collected amount of the at least one substance from the at least one filter. The blowpipe has a cross-sectional flow area through which the compressed air flows. A valve controls provision of the compressed air. The valve has a cross-sectional flow area though which the compressed gas flows. The cross-sectional area of the valve is smaller than the cross-sectional area of the blowpipe to provide for air pressure at the valve to be greater than air pressure at the blowpipe.
    Type: Grant
    Filed: May 1, 2009
    Date of Patent: October 4, 2011
    Assignee: BHA Group, Inc.
    Inventor: Andrew Ray
  • Patent number: 8021456
    Abstract: A filter element for removing particles from a particulate laden fluid stream includes, in an exemplary embodiment, a filtration media formed into a tubular configuration and that a plurality of circumferentially spaced apart pleats. The filter element also includes at least one melt-extruded retention strap extending circumferentially around the filtration media to limit radial movement of the filtration media at operating temperatures up to about 500° F. Each melt-extruded retention strap is formed from a melt extrudable amorphous thermoplastic polyimide.
    Type: Grant
    Filed: November 21, 2008
    Date of Patent: September 20, 2011
    Assignee: BHA Group, Inc.
    Inventors: Thottupurathu Gopakumar, Alan Smithies, Jason Mei
  • Publication number: 20110209612
    Abstract: A system and an associated method for improving mercury removal from a flow containing combustion exhaust. The system includes a filtration arrangement that includes at least one layer of ePTFE, with the at least one ePTFE layer being configured to have a geometry that retains at least some accumulated particulate matter. The system includes an arrangement for providing at least some particulate matter in the flow for accumulation on the filtration arrangement by the geometry.
    Type: Application
    Filed: April 15, 2011
    Publication date: September 1, 2011
    Applicant: BHA Group, Inc.
    Inventors: Vishal Bansal, Peter Martin Maly, Robert Warren Taylor
  • Publication number: 20110209609
    Abstract: A system and associated method for improved mercury removal from a flow containing combustion exhaust. The system includes a filtration arrangement through which the flow proceeds to remove material, including mercury, from the flow. The system includes a sensor arrangement sensing a mercury concentration within the flow downstream of the filtration arrangement and providing a signal indicative of the sensed mercury concentration. The system includes an adjustable temperature control arrangement changing a temperature of the combustion exhaust proceeding to the filtration arrangement in response to the signal indicative of the sensed mercury concentration to change an amount of mercury being removed from the flow.
    Type: Application
    Filed: April 15, 2011
    Publication date: September 1, 2011
    Applicant: BHA Group, Inc.
    Inventors: Vishal Bansal, Peter Martin Maly, Robert Warren Taylor
  • Publication number: 20110192125
    Abstract: A filter media including a scrim, a polytetrafluoroethylene (PTFE) media substrate upon the scrim, and a layer of expanded polytetrafluoroethylene (ePTFE) membrane adhered to the PTFE media substrate on the scrim. The filter media is pleatable and has air permeability of approximately 3-10 cubic feet/min at a 0.5 inch H2O pressure drop and an original filtration efficiency greater than 99.0% when tested in an unused, unpleated condition with a 0.3 micron challenge aerosol at a flow rate of 10.5 feet/min and when tested after a cleanable dust performance test according to ASTM D6830.
    Type: Application
    Filed: February 10, 2010
    Publication date: August 11, 2011
    Applicant: BHA Group, Inc.
    Inventors: Alan Smithies, Karmin Lorraine Olson
  • Publication number: 20110139008
    Abstract: A filter media including a scrim, a polytetrafluoroethylene (PTFE) media substrate upon the scrim, and a layer of expanded polytetrafluoroethylene (ePTFE) membrane adhered to the PTFE media substrate on the scrim. The filter media is pleatable and has air permeability of approximately 3-10 cubic feet/min at a 0.5 inch H2O pressure drop and an original filtration efficiency greater than 99.0% when tested in an unused, unpleated condition with a 0.3 micron challenge aerosol at a flow rate of 10.5 feet/min and when tested after a cleanable dust performance test according to ASTM D6830.
    Type: Application
    Filed: December 16, 2009
    Publication date: June 16, 2011
    Applicant: BHA Group, Inc.
    Inventors: Alan Smithies, Karmin Lorraine Olson
  • Patent number: 7942948
    Abstract: A filter element includes, in an exemplary embodiment, a first end cap, a second end cap, and a composite filter media structure. The composite filter media structure includes a base substrate that includes a nonwoven synthetic fabric formed from a plurality of bicomponent synthetic fibers with a spunbond process, and having a bond area pattern having a plurality of substantially parallel discontinuous lines of bond area. The base substrate having a minimum filtration efficiency of about 50%, measured in accordance with ASHRAE 52.2-1999 test procedure. The composite filter media structure also includes a nanofiber layer deposited on one side of the base substrate by an by electro-blown spinning process. The composite filter media structure having a minimum filtration efficiency of about 75%, measured in accordance with ASHRAE 52.2-1999 test procedure. The composite media structure further includes a plurality of corrugations formed at a temperature of about 90° C. to about 140° C.
    Type: Grant
    Filed: August 29, 2008
    Date of Patent: May 17, 2011
    Assignee: BHA Group, Inc.
    Inventors: Alan Smithies, Jack T. Clements, Jason Mei
  • Patent number: 7942275
    Abstract: A method of making a porous membrane includes, in an exemplary embodiment, mixing together a first fine powder PTFE resin and a second fine powder PTFE resin to form a PTFE resin mixture. The first PTFE resin having a characteristic of forming more and longer fibrils than fibrils formed from the second PTFE resin. The second PTFE resin having a characteristic of forming thicker nodes than nodes formed from the first PTFE resin. The method also includes forming a preform from the PTFE resin mixture, extruding the preform into a tape, passing the tape through a plurality of opposing calender rolls to form a calendered tape having a thickness of about 380 ?m to about 1200 ?m, and stretching the calendered tape in the transverse direction to form a porous membrane having a plurality of nodes and fibrils and having a thickness of at least about 100 ?m.
    Type: Grant
    Filed: July 8, 2008
    Date of Patent: May 17, 2011
    Assignee: BHA Group, Inc.
    Inventor: Gopakumar Thottupurathu
  • Publication number: 20110097571
    Abstract: A porous composite membrane is provided by an associated method and includes a first microporous substrate of a first material. A second, coating material is joined to the first microporous substrate to form a bi-component arrangement with the first microporous substrate. The second material is different than the first material. A third, coating material is applied to the bi-component arrangement. The third material is different than the first and second materials. The third material extending over at least a portion of surfaces of the bi-component arrangement which define the micropores.
    Type: Application
    Filed: October 22, 2009
    Publication date: April 28, 2011
    Applicant: BHA Group, INC.
    Inventors: Yit-Hong Tee, Taher Abujoudeh, Martin Hatfield
  • Patent number: 7927540
    Abstract: A method of making a composite filter media includes, in an exemplary embodiment, forming a nonwoven fabric mat that includes a plurality of synthetic fibers by a spunbond process, and calendaring the nonwoven fabric mat with embossing calendar rolls to form a bond area pattern comprising a plurality of substantially parallel discontinuous lines of bond area to bond the synthetic fibers together to form a nonwoven fabric, the nonwoven fabric having a minimum filtration efficiency of about 50%, measured in accordance with ASHRAE 52.2-1999 test procedure. The method also includes applying a nanofiber layer by electro-blown spinning a polymer solution to form a plurality of nanofibers on at least one side of the nonwoven fabric mat to form the composite filter media, the composite filter media having a minimum filtration efficiency of about 75%, measured in accordance with ASHRAE 52.2-1999 test procedure.
    Type: Grant
    Filed: August 1, 2008
    Date of Patent: April 19, 2011
    Assignees: BHA Group, Inc., E. I. duPont de Nemours and Company
    Inventors: Alan Smithies, Jack T. Clements, David Charles Jones, Hyun Sung Lim
  • Patent number: 7927392
    Abstract: A baghouse and filter assembly are provided for at least partially removing particulate matter from a gas stream. The filter assembly includes first and second filter portions to be coupled together by a coupler for establishing fluid communication between the first and second filter portions when connected. The coupler includes a first coupling portion including a side wall defining an interior passage through which the gas stream can pass in an axial direction between the first and second filter portions, and one or more flanges projecting from said side wall, the one or more flanges supporting a plurality of male studs. The coupler further includes a second coupling portion including a plurality of female keyhole-shaped receivers spaced apart for receiving at least a portion of the male studs and coupling the first coupling portion to the second coupling portion.
    Type: Grant
    Filed: October 28, 2008
    Date of Patent: April 19, 2011
    Assignee: BHA Group, Inc.
    Inventors: Jack T. Clements, Gerry E. Maddocks
  • Publication number: 20110061528
    Abstract: A method of reducing the concentration of pollutants in a combustion flue gas having a first temperature is provided. The method includes the step of providing an organic Rankine cycle apparatus utilizing a working fluid and including at least one heat exchanger is arranged in thermal communication with the flue gas. The method further includes the step of reducing the temperature of the flue gas to a second temperature less than the first temperature by vaporizing the working fluid within the heat exchanger utilizing thermal energy derived from the flue gas. The method further includes the step of filtering the flue gas through at least one filter disposed downstream of the heat exchanger to remove pollutants from the flue gas. An associated system configured to reduce the concentration of pollutants in the combustion flue gas is also provided.
    Type: Application
    Filed: September 16, 2009
    Publication date: March 17, 2011
    Applicant: BHA Group, Inc.
    Inventors: Robert Warren Taylor, James Easel Roberts, Charles Michael Booth
  • Patent number: 7905935
    Abstract: A baghouse and filter assembly are provided for at least partially removing particulate matter from a gas stream. The filter assembly includes a first filter portion to be supported within the baghouse adjacent to an opening defined by a tube sheet, a first generally-tubular frame, and a first pleated filter media adjacent to the first generally-tubular frame. A second filter portion includes a second generally-tubular frame and a second pleated filter media disposed adjacent to the second generally-tubular frame. A coupler is provided for connecting the first filter portion to the second filter portion and establishing fluid communication between the first and second filter portions when connected. The coupling includes a first coupling portion including a side wall defining a receiver, as well as a lug clip disposed adjacent to the receiver. The lug clip us substantially-elastically displaced in a radial direction from an unbiased position during connection of the first and second filter portions.
    Type: Grant
    Filed: September 24, 2008
    Date of Patent: March 15, 2011
    Assignee: BHA Group, Inc.
    Inventor: Jack T. Clements
  • Publication number: 20110048002
    Abstract: An exhaust gas recirculation (EGR) system and a method for recirculating an exhaust gas stream from an outlet to an inlet of a turbomachine are provided. The EGR system includes a guide element to channel the exhaust gas stream from the inlet to the outlet and a Rankine cycle system through which a working fluid is circulated. The Rankine cycle system including serially a high temperature heat exchanger in heat exchange relationship with the guide element; an expansion device coupled to a generator; a low temperature heat exchanger in heat exchange relationship with a cooling medium; and a pump. The exhaust stream at the outlet has a first temperature and the exhaust stream downstream of the high temperature heat exchanger has a second temperature that is lower than the first temperature.
    Type: Application
    Filed: August 27, 2009
    Publication date: March 3, 2011
    Applicant: BHA Group, Inc.
    Inventors: Robert Warren Taylor, James Easel Roberts
  • Publication number: 20100275776
    Abstract: A system for cleaning at least one filter in a baghouse and an associated method for providing the system. The at least one filter separate a dirty gas chamber from a clean gas chamber, and filters at least one substance from a gas. The system includes a supply of compressed air and a blowpipe to direct the air at the at least one filter to dislodge a collected amount of the at least one substance from the at least one filter. The blowpipe has a cross-sectional flow area through which the compressed air flows. A valve controls provision of the compressed air. The valve has a cross-sectional flow area though which the compressed gas flows. The cross-sectional area of the valve is smaller than the cross-sectional area of the blowpipe to provide for air pressure at the valve to be greater than air pressure at the blowpipe.
    Type: Application
    Filed: May 1, 2009
    Publication date: November 4, 2010
    Applicant: BHA Group, Inc.
    Inventor: Andrew Ray
  • Publication number: 20100255741
    Abstract: A waterproof, vapor-permeable and air-permeable sheet material. The sheet material includes a waterproof microporous polymer substrate and a microporous thermoplastic coating layer attached to the polymer substrate. The thermoplastic coating layer is vapor-permeable and air-permeable. The thermoplastic coating layer is at least partially interpenetrated into pores of the polymer substrate forming an interface that prevents passage of water droplets, while permitting passage of water vapor and air, when a chemical is present on the sheet material that would otherwise cause the polymer substrate to permit passage of water droplets. The interface is resistant to chemical interference with at least the waterproof property of the sheet material.
    Type: Application
    Filed: April 2, 2009
    Publication date: October 7, 2010
    Applicant: BHA Group, Inc.
    Inventors: Yit-Hong Tee, Taher Abujoudeh
  • Publication number: 20100218471
    Abstract: A composite filter media structure and an associated method of making are provided. The structure includes a base substrate that includes a nonwoven fabric substrate formed from a plurality of bicomponent synthetic fibers using a spunbond process. The composite filter media structure includes a nanofiber layer deposited on one side of the base substrate by an electro-blown spinning process. In one aspect, the base substrate and the nanofiber layer are configured to provide at least an 85% filtration efficiency measured in accordance with an ASHRAE 52.2-1999 test method. In another aspect, the nanofiber layer has a basis weight of about 2.0 g/m2 to about 3.0 g/m2.
    Type: Application
    Filed: February 27, 2009
    Publication date: September 2, 2010
    Applicant: BHA Group, Inc.
    Inventors: Alan Smithies, Robert Henry Devine, II, Jack T. Clements
  • Patent number: 7771818
    Abstract: The present invention is a method for modifying at least one property of a porous membrane. The method comprises the steps of providing a porous membrane. The method also includes exposing the membrane to a fluid at supercritical conditions. At least one property of the membrane is modified while the membrane is exposed to the fluid at supercritical conditions. The condition of the fluid is changed in such a manner that the porous membrane retains the modified property. The present invention is also sheet material that is water-resistant, moisture vapor transmissive and air permeable. The sheet material comprises a membrane having an open pore structure including surfaces defining a plurality of interconnecting pores extending through the membrane and between major sides of said membrane in which the pores have an average pore size. The membrane is made from a material tending to absorb oils and contaminating agents.
    Type: Grant
    Filed: September 20, 2002
    Date of Patent: August 10, 2010
    Assignee: BHA Group, Inc.
    Inventors: Robert John Klare, Greg Strugalski
  • Publication number: 20100129629
    Abstract: A waterproof, vapor-permeable and gas-permeable sheet material and a method of making are provided. The sheet material includes a waterproof microporous layer and a thermoplastic layer attached to the microporous layer. The thermoplastic layer is vapor-permeable and air-permeable. The microporous layer is at least partially integrated with the thermoplastic layer to form a zone that prevents passage of water droplets, while permitting passage of water vapor and air, when a chemical is present on the sheet material that would otherwise cause the microporous layer to permit passage of water droplets. The Zone can be considered to be resistant to chemical interference with at least the waterproof property of the microporous layer and inhibits detachment of the layers.
    Type: Application
    Filed: November 21, 2008
    Publication date: May 27, 2010
    Applicant: BHA GROUP, INC.
    Inventors: Yit-Hong Tee, Taher Abujoudeh, Cynthia Polizzi