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| Number | Title | Issue Date |
| 7533632 | Natural circulation industrial boiler for steam assisted gravity drainage (SAGD) process A gravity feed, natural circulation boiler for an SAGD process using low quality feedwater for carbonatious material recovery, has a large diameter steam drum with downcomers. A furnace of the boiler has individually replaceable membrane wall modules, each with uppe... | 05/19/2009 |
| 7228822 | Vapor generator using pre-heated injected water An efficient high-temperature water vapor generator is used to de-contaminate soil. The vapor generator includes a combustion chamber and a surrounding structure, wherein a cavity is located therebetween. Water is routed through the cavity and into the combustion ch... | 06/12/2007 |
| 7073451 | Furnace wall structure A furnace wall comprises: a furnace wall bottom part composed of furnace wall tubes having upward-spiraled fluid passages; a nose part which has nose wall tubes disposed in a middle part of a furnace rear wall adjoining the furnace wall bottom part; and a screen par... | 07/11/2006 |
| 6793013 | Polygonal heat exchange chamber including a tapered portion lined with water tube panels and method of lining a tapered portion of a polygonal heat exchange chamber with such panels A vertical polygonal heat exchange chamber includes an upper opening, a lower opening, and an enclosure formed between the upper and lower openings. The enclosure includes at least one tapered portion that narrows in a direction toward one of the openings. The taper... | 09/21/2004 |
| 6715450 | Fossil-fuel fired continuous-flow steam generator A continuous-flow steam generator includes a combustion chamber with evaporator tubes for fossil fuel. The combustion chamber is followed on the fuel-gas side, via a horizontal gas flue, by a vertical gas flue. When the continuous-flow steam generator is in operatio... | 04/06/2004 |
| 6578529 | Arrangement for feeding black liquor into a recovery boiler The present invention relates to an arrangement for introducing black liquor into a furnace of a recovery boiler, said arrangement comprising an elongated tube having an interior surface and an exterior surface, through which tube the black liquor being f... | 06/17/2003 |
| 6557499 | Fossil-fuel-fired once-through steam generator The steam generator has a combustion chamber for fossil fuel. A vertical gas flue is arranged downstream of the combustion chamber on a heating-gas side and connected via a horizontal gas flue. The structure requires especially little outlay in terms of m... | 05/06/2003 |
| 6491000 | Wall protection from downward flowing solids A tube wall, division wall, or wing wall section (10) for a circulating fluidized bed boiler with improved erosion resistant characteristics has a reduced diameter tube section (40) adjacent the refractory covered by an abrasion resistant refractory tile ... | 12/10/2002 |
| 6250257 | Method for operating a once-through steam generator and once-through steam generator for carrying out the method A once-through steam generator having a combustion chamber. A containing wall of the combustion chamber is formed from vertically disposed evaporator tubes welded to one another in a gas-tight manner. The combustion chamber is to be capable of being used ... | 06/26/2001 |
| 6205634 | Furnace floor An improved floor for a recovery boiler furnace having a flat floor has a number of tubes in the floor immediately adjacent each of the sidewalls of the furnace oriented at an oblique angle to horizontal. A method of replacing the floor is provided as wel... | 03/27/2001 |
| 6067944 | Furnace floor An improved floor for a recovery boiler furnace having a flat floor has a number of tubes in the floor immediately adjacent each of the sidewalls of the furnace oriented at an oblique angle to horizontal. A method of replacing the floor is provided as wel... | 05/30/2000 |
| 6044805 | Wall protection from downward flowing solids A tube wall, division wall, or wing wall section for a circulating fluidized bed boiler with improved erosion resistant characteristics has a reduced diameter tube section adjacent the refractory covered by an abrasion resistant refractory tile. The refra... | 04/04/2000 |
| 5979369 | Once-through steam generator having spirally disposed evaporator tubes A once-through steam generator includes a gas flue formed of steam generator tubes welded to one another in a gas-tight manner through fins. The steam generator tubes are connected in parallel for the throughflow of a flow medium, they have a surface stru... | 11/09/1999 |
| 5979367 | Dense fluidized bed exchanger to be associated with a circulating fluidized bed reactor A dense fluidized bed exchanger includes a casing the vertical longitudinal walls of which consist of tubes conveying a heat-conducting fluid, the casing being divided lengthwise into chambers separated from each other by a baffle consisting of a wall con... | 11/09/1999 |
| 5934227 | Variable pressure once-through steam generator upper furnace having non-split flow circuitry A once-through steam generator having single pass non-split fluid flow upper furnace circuitry with a one to one connection of tubes of the lower furnace spiral or vertical tube assembly being connected to the vertical tubes of the upper furnace assembly ... | 08/10/1999 |
| 5901669 | Variable pressure once-through steam generator upper furnace having non-split flow circuitry A once-through steam generator having single pass non-split fluid flow upper furnace circuitry with a one to one connection of tubes of the lower furnace spiral or vertical tube assembly being connected to the vertical tubes of the upper furnace assembly ... | 05/11/1999 |
| 5775265 | Cooling surface cladding In a cooling surface cladding for polygonal chambers of steam generators with a hopper-shaped floor and fired on the circulating fluidised bed principle, which consists partially of substantially vertical finned tubes extending in the manner of walls betw... | 07/07/1998 |
| 5755188 | Variable pressure once-through steam generator furnace having all welded spiral to vertical tube transition with non-split flow circuitry A once-through steam generator furnace having single pass non-split fluid flow circuitry to prevent steam-water separation with a one to one connection of smaller diameter tubes of the lower furnace spiral tube assembly being connected to the larger diame... | 05/26/1998 |
| 5730071 | System to improve mixing and uniformity of furnace combustion gases in a cyclone fired boiler An apparatus for improving mixing and uniformity of furnace combustion gases in a boiler includes a slag screen 50, slag screen baffle 62 with a plurality of wingwall sections 52 situated between cyclone burner riser sections 64. This arrangement improves... | 03/24/1998 |
| 5730087 | Tube enclosure and floor support routing for once through steam generators Pendant convection pass tube circuitry of once through steam generator have their floor and floor support tubes enlarged by a swage coupling and connected to enlarged sidewall tubes supported from steel boiler top supports to provide a more flexible circu... | 03/24/1998 |
| 5722353 | Once-through steam generator vertical tube hopper enclosure with continous transition to spiral furnace enclosure A once-through steam generator having single pass non-split fluid flow circuitry with a one to one connection of furnace hopper vertical tubes assembly being connected to the spiral tubes of the lower furnace assembly.... | 03/03/1998 |
| 5701850 | Steam generator A fossil-fired steam generator includes a gas flue having a surrounding wall being formed by tubes which are mutually joined gas-tightly and which are disposed substantially vertically and can conduct an upward flow through them on the medium side. The tu... | 12/30/1997 |
| 5687676 | Steam generator A steam generator is operated under both of supercritical pressure and subcritical pressure and has having generating tubes that form a furnace wall. Upper and lower generating tubes which are directed vertically and central generating tubes are inclined ... | 11/18/1997 |
| 5673654 | Marine boiler Boiler for generating steam and comprising a furnace wall defining a furnace, a casing wall concentrically encircling the furnace wall and jointly with the furnace wall defining a substantially annular interspace, steam consucting tubes positioned at the ... | 10/07/1997 |
| 5557901 | Boiler buckstay system A buckstay system for a membraned-tube wall of a steam generator having a first wall section which meets a second wall section at an angle to form a corner. At least one buckstay extends across at least part of each wall section. A pair of tie bars are we... | 09/24/1996 |
| 5542378 | Waterwall tube block design A waterwall heat transfer system has a tube block secured to a tube assembly. The tube assembly includes a plurality of parallel tubes connected together by a membrane. The tube block has a base section and a plurality of spaced ridges extending upward fr... | 08/06/1996 |
| 5526775 | Circulating fluidized bed reactor and method of operating the same A circulating fluidized bed reactor has substantially vertical walls with cooling elements, defining the interior of the reactor chamber, and a device for introducing fluidization gas at the bottom of the fluidized bed reactor. Particulate material is int... | 06/18/1996 |
| 5501181 | Spiral furnace support tube strap A method of supporting the spiral boiler tubing that surrounds a portion of the furnace or combustion area of a steam generator. This method of support eliminates the need to weld plate to the outside of the boiler tubing thereby increasing the mass of th... | 03/26/1996 |
| 5390631 | Use of single-lead and multi-lead ribbed tubing for sliding pressure once-through boilers A vertical tube, once-through, sliding pressure steam generator comprises a furnace having an outlet and heat exchanger surfaces made of smooth bore tubes, single-lead ribbed (SLR) tubes, and multiple-lead ribbed (MLR) tubes. All of these tubes are prefer... | 02/21/1995 |
| 5347955 | Steam generator A fossil-fueled steam generator includes a vertical gas flue having a lower region being near a flame location, a region above the lower region being remote from the flame location, and an encompassing wall with tubes through which a medium can flow. The ... | 09/20/1994 |
| 5273003 | Cyclone furnace with increased tube wall material A cyclone furnace includes a cyclone cylinder having five separate tubular water circuit panels which are serviced by substantially independent lower inlet upper outlet header segments. One hundred and twenty three tubes each having a 1.125" OD and 0.210"... | 12/28/1993 |
| 5203285 | Uniform distribution heat-transfer pipe unit for double-layer fluids In a furnace wall heat-transfer pipe unit in a spiral wound-type boiler, for distributing gas-liquid double layer fluids from lower part spiral pipes to upper vertical pipes, a horizontal pipe is interposed between the spiral pipes and the vertical pipes ... | 04/20/1993 |
| 5154139 | Refractory tube block A tube block containing a ribbed surface for prtecting a boiler tube assembly from corrosion is disclosed. The improved design protects the tube assembly while at the same time permitting excellent heat transfer.... | 10/13/1992 |
| 5094191 | Steam generating system utilizing separate fluid flow circuitry between the furnace section and the separating section A fluidized bed steam generating system in which a duct is disposed between a furnace outlet and a separator inlet. The duct is formed by first and second wall panels which are comprised of a plurality of parallel tubes extending perpendicular to the dire... | 03/10/1992 |
| 5091156 | Waterwalls in a fluidized bed reactor A fluidized bed reactor generating heat has in its bottom part a grid for introduction of fluidizing gas into the rector and walls being made as waterwalls in which vertical water tubes are combined by flat plate material. The waterwalls are refractory li... | 02/25/1992 |
| 4987862 | Once-through steam generator A once-through stem generator includes a vertical gas flue having a total given height, a bottom, a lower part having a height equal to less than 70% of the total given height, an upper part, and fossil fuel burners disposed on the lower part. The lower a... | 01/29/1991 |
| 4926799 | Continuous flow steam generator A continuous flow steam generator includes a vertical gas flue to which burners for fossil fuel are to be attached. The flue has a tube wall and a lower end with a bottom. The tube wall includes vertically disposed tubes with inlet and outlet ends and lon... | 05/22/1990 |
| 4817565 | Thermally turbulent combustion system A thermally turbulent combustion system for combusting solid fuel which includes a generally cylindrical, longitudinally extending stationary combustion chamber formed by a plurality of interconnected circumferential cooling pipes and fuel transport means... | 04/04/1989 |
| 4818253 | Device for gasifying finely divided fuels under increased pressure The gasification device includes a pipe wall structure assembled of a plurality of pipe circuits enclosing in a gas tight manner a reactor space. A pressure jacket surrounds at a distance the pipe wall structure and delimits therewith a water filled inter... | 04/04/1989 |
| 4809621 | Refractory brick protection for membrane boiler walls Refractory bricks, suspended wall of refractory bricks, and a method for mounting refractory bricks for protection of membrane boiler tube walls. The pre-fired brick has a rectangular generally flat exterior face, a top face having an upper groove extendi... | 03/07/1989 |
