Abstract:
A heat exchanger (500) for transferring heat between a first gas flow (28), such as flue gases, and a second gas flow (34), such as air or oxygen, includes a housing (514) having a first inlet plenum (520) for receiving the first gas flow (28), a first outlet plenum (522) for discharging the first gas flow (28), a second inlet plenum (526) for receiving the second gas flow (34), and a second outlet plenum (528) for discharging the second gas flow (34). The heat exchanger (500) further includes heat exchange elements (512) disposed within the housing (514). Radial seals (224, 226, 228, 230) are disposed between the housing (514) and the heating elements (512) that define a radial plenum (535, 536). Axial seals (220, 222) are further disposed between the housing (514) and the heating elements (512) to define an axial plenum (530). A third gas flow, such as recirculated flue gas, is provided in the radial plenum (535, 536) and the axial plenum (530) to reduce the leakage between the first gas flow (28) and the second gas flow (34).
Abstract:
Die Erfindung betrifft einen rotierenden Wärmetauscher (1) mit einem Gehäuse (2), in welchem zwei voneinander getrennte Kanäle (5a, 5b) zur Durchleitung jeweils eines Luftstromes ausgebildet sind, und mit einem Wärmetauscherelement (3), welches drehbar in dem Gehäuse (2) gelagert ist. Das Wärmetauscherelement (3) steht mit beiden Kanälen (5a, 5b) in Kontakt, wobei dem Wärmetauscherelement (3) eine Antriebseinrichtung (4, 11) zum Erzeugen einer Rotation zugeordnet ist.
Abstract:
A heat exchange method capable of suppressing a loading on a rotating motor and a wear of a seal part and simultaneously performing a recovery of heat from exhaust gas and a reduction in NOx, comprising the steps of detecting the density of Nox in the exhaust gas exhausted from a furnace (10) such as a billet heating furnace and a billet heat treatment furnace having a rotating regenerative heat exchanger installed therein and controlling the speed of a rotor (3) by a controller (14) so as to increase the speed of the rotor (3) of the rotating regenerative heat exchanger when the density of Nox is increased, whereby the speed of the rotor is not required to be increased at all times for the maximum load of the furnace, and the load on the motor and the wear of the seal part can be suppressed.
Abstract:
The heat accumulator block has a dirt pan (6) consisting of a plurality of guard plates (12) which are placed substantially parallel to one another in order to form flow channels, and are fastened by their lateral walls (13) to a holding device (14). Adjacent guard plates (12) are held separated but fastened to each other by spacers (15). The spacers (15) are so arranged that they lie on the face against which the cold medium flows, at a distance from the front-side edges of the guard plates (12). This reduces the formation of sediment in the area of these edges. Furthermore, the guard plates (12) consist of elastically ductile synthetic material and have an undulated profile. Their motivity under vibration and thermal expansion promotes the flaking of sediment.
Abstract:
The present invention relates to an arrangement in a regenerative, rotary heat exchanger for sensing and controlling the clearance between a flange (8) that projects radially outwards around the end surfaces of the rotor (1) and sector plates (3, 4) that move axially in relation to said end surfaces and that mutually separate the two heat exchanging media (5, 6). According to the invention, clearance sensing devices (7) are mounted on projections (12) which project out peripherally from the edges of the sector plates adjacent the rotor flange (8) such that the sensing devices are located in the flows of heat exchanging media.
Abstract:
Ein Rotationswärmetauscher, der von einem ersten Fluidstrom, z.B. einem Außenluft- bzw. Zuluftstrom, und einem zweiten Fluidstrom, z.B. einem Abluft- bzw. Fortluftstrom im Gegenstrom durchströmbar ist, hat einen drehbar gelagerten Rotor (5), der einen ersten Strömungssektor für den ersten Fluidstrom und einen zweiten Strömungssektor für den zweiten Fluidstrom aufweist, die er bei einer Drehung durchläuft, eine Halterung, in der der Rotor (5) drehbar gelagert ist, und eine Dichtungsvorrichtung (9), mittels der die Anströmseite des ersten Fluidstroms und die Abströmseite des zweiten Fluidstroms von der Abströmseite des ersten Fluidstroms bzw. der Anströmseite des zweiten Fluidstroms abtrennbar ist. Um die Dichtungsvorrichtung zu vereinfachen, wobei eine zuverlässige Abdichtung zwischen den Anström- und Abströmseiten der beiden Fluidströme bei Betrieb des Rotationswärmetauschers automatisch gewährleistet sein soll, wird vorgeschlagen, dass die Dichtungsvorrichtung (9) eine erste Dichtung (12), die gegen die anströmseitig des ersten Fluidstroms angeordnete Seite einer Trennwand (10) abdichtet, und eine zweite Dichtung (13) aufweist, die gegen die anströmseitig des zweiten Fluidstroms angeordnete Seite derselben Trennwand (10) abdichtet.
Abstract:
Heat exchange apparatus (100) such as a condensing boiler may comprise a gas heating stage comprising a liquid source and an evaporator heat exchanger (135) configured to heat a first gas stream (e.g. boiler inlet air) flowing from a first gas inlet to a first gas outlet, the evaporator heat exchanger being configured to evaporate liquid from the liquid source (139) to add vapour to the first gas stream, and, a gas cooling stage comprising a condenser heat exchanger (235) configured to cool a second (e.g. different) gas stream(e.g. boiler exhaust gas) flowing from a second gas inlet to a second gas outlet, the condenser heat exchanger being configured to condense vapour present in the second gas stream, and preferably to direct condensed vapour into a or the liquid source (239). The evaporator heat exchanger (135) transfers thermal energy from the liquid source to the first gas stream. The condenser heat exchanger (235) transfers thermal energy from the second gas stream to the liquid source. In each heat exchanger, the liquid source may be a liquid stream that flows in counter-flow to the gas stream, and the same liquid stream may flow through both heat exchangers in an open or closed circuit (140, 142) such that such that the liquid stream acts as a heat (or heat and mass) transfer fluid between the two heat exchangers (135, 235). In this way, thermal energy may be transferred between the two respective gas streams by the same liquid stream. The apparatus thus acts as a gas-to-gas heat exchanger comprising a gas-to-liquid heat exchanger configured to cool a first gas stream and a further gas-to-liquid heat exchanger configured to heat a second gas stream. Each of the evaporator heat exchanger (135) and condenser heat exchanger (235) may comprise a porous structure such as an open-cell foam structure (130).The porous structure may be rotatably mounted and partially submerged in the liquid stream, which may flow in counter-flow to the gas stream above it. The structure may comprise an elongate porous structure rotatable about its lengthwise axis, the liquid and gas streams each flowing parallel with that axis such that the heat exchange process causes a temperature gradient to develop along the length of the porous structure. The porous structure may have an average effective pore diameter of at least 3mm,such large pores being resistant to blocking, such that an annular seal against the circumferential outer wall/perimeter of the porous structure is not required.
Abstract:
A system transfers thermal energy between incoming supply air and outgoing exhaust air. The system comprises: at least four rotary heat exchange units positioned in an array so that incoming supply air and outgoing exhaust air passes through each of the wheels as counter flowing air streams; and partitions defining at least three pathways for directing the counter flowing air streams through the rotary heat exchange units. A method of transferring thermal energy between incoming supply air and outgoing exhaust air is also described. The method comprises: positioning at least four rotary heat exchange units in an array in an air transfer system so that incoming supply air and outgoing exhaust air passes through each of the wheels as counter flowing air streams; and defining at least three pathways for directing the counter flowing air streams through the rotary heat exchange units.