Patents Assigned to Hague International
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Patent number: 4437217Abstract: The heat exchange tube has a porous thermal shock resistant outer shell composed of a corrosion resistant ceramic material that may have a finned outer surface or a plain cylindrical outer surface. The outer shell contains an inner tube composed of a dense nonporous ceramic which is capable of containing high pressure gases, but which may not be as thermally shock resistant or corrosion resistant as the outer shell. The inner tube is formed of a dense ceramic material such as a highly dense silicon carbide or silicon nitride having at each end a like density insert. The end inserts provide sealing surfaces to contact other components in the heat exchanger such as identical ceramic tube assemblies to form a gas-type pressure seal. The inner tube can be fabricated by a deposition technique suh as a chemical or physical vapor deposition, and alternatively, can be made separately and press fitted into the outer shell or the outer shell can be cast or otherwise formed around the inner tube.Type: GrantFiled: February 1, 1982Date of Patent: March 20, 1984Assignee: Hague InternationalInventors: Paul G. Lallaye, John W. Bjerklie, Robert A. Penty
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Patent number: 4380429Abstract: An internally recirculating burner designed to operate at a low level of excess air without producing intolerable levels of particulate (smoke) and oxides of nitrogen using ambient or highly preheated atmospheric air as an oxidant. The burner operates with a flame front outside of the burner in the combustion chamber with recirculation of furnace gas being provided by the geometric configuration of the burner and the energy provided by the incoming combustion air. A nozzle means for controlling the combustion air flow is disclosed concentric with the burner center body. The nozzle is comprised of a fixed ceramic nozzle plate having annularly arranged distribution holes and a nozzle plus also preferably of ceramic supported to open and close the annular flow passage between the nozzle and the burner center body as well as the annular flow distribution holes.Type: GrantFiled: November 2, 1979Date of Patent: April 19, 1983Assignee: Hague InternationalInventors: Paul G. LaHaye, John W. Bjerklie
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Patent number: 4336721Abstract: The gas sampling apparatus may be embodied as a hot sampler or a cold sampler, and basically comprises an insulated housing concentrically supporting an inlet tube which in turn supports a nozzle through which the gas sample is metered, passing to the detection cell. The gas sample is drawn past the cell by an aspirator. A controllable heater is disposed concentrically about the inlet tube and proximate to the aspirator for maintaining the sensing cell at its perferred operating temperature which in one case is 704.degree. C. The aspirator is preferably maintained above 430.degree. C. but below 590.degree. C. by the heater. By maintaining the sample gas in this elevated temperature range, accumulation of residuals of the process are avoided. Provision is made for periodic purging of the apparatus with fresh air to remove residuals from the sampler.Type: GrantFiled: June 3, 1980Date of Patent: June 29, 1982Assignee: Hague InternationalInventor: Richard H. Curtis
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Patent number: 4332295Abstract: The heat exchange tube has a porous thermal shock resistant outer shell composed of a corrosion resistant ceramic material that may have a finned outer surface or a plain cylindrical outer surface. The outer shell contains an inner tube composed of a dense nonporous ceramic which is capable of containing high pressure gases, but which may not be as thermally shock resistant or corrosion resistant as the outer shell. The inner tube is formed of a dense ceramic material such as a highly dense silicon carbide or silicon nitride having at each end a like density insert. The end inserts provide sealing surfaces to contact other components in the heat exchanger such as identical ceramic tube assemblies to form a gas-type pressure seal. The inner tube can be fabricated by a deposition technique such as a chemical or physical vapor deposition, and alternatively, can be made separately and press fitted into the outer shell or the outer shell can be cast or otherwise formed around the inner tube.Type: GrantFiled: May 19, 1980Date of Patent: June 1, 1982Assignee: Hague InternationalInventors: Paul G. LaHaye, John W. Bjerklie, Robert A. Penty
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Patent number: 4254715Abstract: A primary combustion chamber is located above a secondary combustion chamber with a support grate between the two for supporting particulate solid waste fuel to be burned efficiently. Primary air is introduced to the primary combustion chamber with secondary air introduced below the grate into a combustion gas flow to cause complete burning in the secondary combustion chamber. A brick wall screen means of high temperature, corrosion-resistant brick forms the secondary combustion chamber to allow exhaust gaseous product to exit therethrough while screening out ash which can be removed from the combustion area. The gaseous product passed through the screen is then passed to a heat exchanger to utilize part of the heat produced for heating primary and secondary air used in the combustor. The exhaust gas from the heat exchanger can then be put to use in a boiler or other energy producing device.Type: GrantFiled: November 15, 1978Date of Patent: March 10, 1981Assignee: Hague InternationalInventors: Paul G. LaHaye, John W. Bjerklie, Ivan G. Most, Kenneth G. Hagen
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Patent number: 4144020Abstract: An energy conserving process furnace has a recuperator to utilize heat derived from exhaust gases in order to reduce fossil fuel consumption of the furnace. Elongated, enhanced surface ceramic heat exchanger tubes are used in the recuperator to recover heat energy from the exhaust gas. A preferred sealing arrangement is used between the metal and ceramic tubes to contain the combustion air. Heat is added by the recuperator to combustion air used in a fluid fuel burner. The ceramic tubes are provided with vibration protective mechanisms to prolong useful life under severe mechanical vibration encountered in some applications.In a method of operating a slot furnace, exhaust gas is exhausted from a side of the furnace through the slot or a passageway having an elongated horizontal cross section. In the preferred arrangement a second passage or air curtain passageway is positioned adjacent the first passageway to permit proper gas flow through a recuperator.Type: GrantFiled: May 12, 1977Date of Patent: March 13, 1979Assignee: Hague InternationalInventors: Paul G. LaHaye, John W. Bjerklie, Gerald G. Gallant, Jr.
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Patent number: 4134449Abstract: A bellows arrangement for forming a gas leakage resistant pressure seal between ceramic heat exchange tubes has an elongated metallic bellows defining a central passageway with first and second ends. A metallic tube passes through the bellows and freely moves with respect to the second end of the bellows while defining a gas chamber between the tube and bellows. Axial expansion of the bellows under the influence of the internal pressure when such pressure is higher than the external pressure which may be the atmosphere acts to apply a force at the interface between the bellows assembly and the ceramic heat exchange tube which is proportional to the internal pressure of the heat exchange tube, thereby accommodating movement of the heat exchange tube and providing a pressure seal that is leak resistant.Type: GrantFiled: December 2, 1976Date of Patent: January 16, 1979Assignee: Hague InternationalInventors: Paul G. La Haye, John W. Bjerklie
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Patent number: 4115051Abstract: A slot furnace has a radiation resistant door which can easily be opened and closed as necessary during operation. The door is mounted on a pivot so that an end thereof covered with heat resistant insulation can be pivoted to open and close the slot when desired, to allow ease of feeding and removing materials from the furnace while preventing substantial radiational heat loss during normal operations.Type: GrantFiled: November 29, 1976Date of Patent: September 19, 1978Assignee: Hague InternationalInventor: John W. Bjerklie
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Patent number: 4070841Abstract: An insulated material comprises a first wall having a surface with a layer of insulation thereover. The insulation is anchored to the wall by a plurality of rods which are each attached to the wall and extends through the insulation. The rods are interlocked at expansion point means which allows expansion and contraction of the rods without permitting movement of the insulation from its position.Type: GrantFiled: May 4, 1976Date of Patent: January 31, 1978Assignee: Hague InternationalInventors: Paul G. La Haye, Ralph E. Anderson
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Patent number: 4060379Abstract: An energy conserving process furnace has a recuperator to utilize heat derived from exhaust gases in order to reduce fossil fuel consumption of the furnace. Elongated, enhanced surface ceramic heat exchanger tubes are used in the recuperator to recover heat energy from the exhaust gas. A preferred sealing arrangement is used between the metal and ceramic tubes to contain the combustion air. Heat is added by the recuperator to combustion air used in a fluid fuel burner.A recirculating burner has a flame front outside of the burner in the combustion chamber. The recirculating burner means acts to reduce the combustion air requirements and to provide a combustion zone low in oxygen so as to prevent scale formation and oxidation of metals being treated in the furnace area.Type: GrantFiled: January 27, 1976Date of Patent: November 29, 1977Assignee: Hague InternationalInventors: Paul G. LaHaye, John W. Bjerklie, Gerald G. Gallant, Jr.
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Patent number: 4029465Abstract: An energy conserving process furnace has a recuperator to utilize heat derived from exhaust gases in order to reduce fossil fuel consumption of the furnace. Elongated, enhanced surface ceramic heat exchanger tubes are used in the recuperator to recover heat energy from the exhaust gas. A preferred sealing arrangement is used between the metal and ceramic tubes to contain the combustion air. Heat is added by the recuperator to combustion air used in a fluid fuel burner. The ceramic tubes are provided with vibration protective mechanisms to prolong useful life under severe mechanical vibration encountered in some applications.In a method of operating a slot furnace, exhaust gas is exhausted from a side of the furnace through the slot or a passageway having an elongated horizontal cross section. In the preferred arrangement a second passage or air curtain passageway is positioned adjacent the first passageway to permit proper gas flow through a recuperator.Type: GrantFiled: February 6, 1975Date of Patent: June 14, 1977Assignee: Hague International CorporationInventors: Paul G. LaHaye, John W. Bjerklie, Gerald G. Gallant, Jr.