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An apparatus is provided including a furnace structure defining a reaction chamber in which oxidant and fuel are reacted to form combustion products and having an anchor surface having an opening through which the oxidant and fuel are introduced into the reaction chamber. The reaction chamber is con

An apparatus is provided including a furnace structure defining a reaction chamber in which oxidant and fuel are reacted to form combustion products and having an anchor surface having an opening through which the oxidant and fuel are introduced into the reaction chamber. The reaction chamber is configured to recirculate the combustion products back toward the anchor surface. The apparatus also includes an anchor outlet configured to create a layer of combustion products directed along the anchor surface under the influence of the recirculated combustion products. The apparatus further includes a primary outlet configured to direct primary fuel to flow into the reaction chamber through the opening and the layer of combustion products so as to ignite the primary fuel.

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An apparatus is provided including a furnace structure defining a reaction chamber in which oxidant and fuel are reacted to form combustion products and having an anchor surface having an opening through which the oxidant and fuel are introduced into the reaction chamber. The reaction chamber is con

An apparatus is provided including a furnace structure defining a reaction chamber in which oxidant and fuel are reacted to form combustion products and having an anchor surface having an opening through which the oxidant and fuel are introduced into the reaction chamber. The reaction chamber is configured to recirculate the combustion products back toward the anchor surface. The apparatus also includes an anchor outlet configured to create a layer of combustion products directed along the anchor surface under the influence of the recirculated combustion products. The apparatus further includes a primary outlet configured to direct primary fuel to flow into the reaction chamber through the opening and the layer of combustion products so as to ignite the primary fuel. s. 8. The pump of claim 7, wherein the pumping means comprises a gear pump having primary and secondary gears meshed with one another. 9. The pump of claim 8 comprising one primary gear and two or more secondary gears, the secondary gears meshing with the primary gear. 10. The pump of claim 9 wherein the primary gear has a prime number of gear teeth. 11. The pump of claim 8, including drive and idler shafts rotatably supported in bores in the front and rear covers, the primary gear being fixed to the drive shaft and the secondary gear being fixed to the idler shaft, the primary and secondary gears being disposed in the gear housing between the front and rear covers. 12. The pump of claim 11, wherein the idler shaft is rotatably supported in one of the bores by a pair of retaining rings engaging the idler shaft on opposite sides of the gear housing. 13. The pump of claim 11, wherein one end of the drive shaft extends through the front cover, the one end having a drive connection and a seal means at the one end for sealing the drive shaft at the front cover. 14. The pump of claim 11 wherein the drive shaft is rotatably retained within one of the bores by a pair of retaining rings engaging the drive shaft on opposite sides of the gear housing. 15. The pump of claim 7, wherein the housing has a first axial area internally of the housing and the second pressure acts upon the first axial area, the rear cover having a second axial area externally of the rear cover greater than the first axial area. 16. The pump of claim 7, wherein the inlet comprises an axially directed opening in the rear cover and the outlet comprises a radial passage in the rear cover. 17. The pump of claim 16, wherein the inlet is disposed coincident with the central axis. 18. The pump of claim 6, wherein the means for applying the second pressure to at least some of the pump components to hold the plurality of pump components together in the axially disposed relation without applying a separate clamping force to the components in a direction parallel to the housing axis comprises a plurality of pins extending through holes in the components. 19. The pump of claim 6, wherein the housing includes an external thread for threadably securing the pump in a cavity. 20. A hydraulic apparatus comprising a block including a cavity and a pressure clamped hydraulic gear pump in the cavity, the pressure clamped hydraulic gear pump having a housing clamped by hydraulic fluid pressure and defining a central axis, the pump further including a drive shaft extending along the central axis, the block further including an inlet channel and an outlet channel, the inlet channel communicating with the cavity and an inlet of the pump, and the outlet channel communicating with the cavity and an outlet of the pump. 21. The hydraulic apparatus of claim 20 wherein the pump further includes a plurality of pump components positioned in axially disposed relation to one another, pumping means located in the housing for drawing fluid into the inlet at a first pressure and pumping the fluid from the outlet at a second pressure greater than the first pressure, the drive shaft extending from the housing along the central axis being operatively connected to the pumping means for drawing fluid into the inlet at a first pressure and pumping the fluid from the outlet at a second pressure greater than the first pressure when the drive shaft is rotated about the central axis, the housing having a first internal axial area upon which the second pressure acts and a second external axial area greater than the first axial area; and the hydraulic apparatus further includes means for sealing the pump inlet and the inlet channel from the pump outlet and the outlet channel such that the second pressure acts upon the second axial area when the pump is operated and applies a clamping force to the housing components. 22. The hydraulic apparatus of claim 21 further comprising a motor connected to the drive sha