EP3295107A1 - Éléments d'échange de chaleur, destinés notamment à des installations d'épuration de gaz de combustion de centrales électriques - Google Patents

Éléments d'échange de chaleur, destinés notamment à des installations d'épuration de gaz de combustion de centrales électriques

Info

Publication number
EP3295107A1
EP3295107A1 EP16723707.2A EP16723707A EP3295107A1 EP 3295107 A1 EP3295107 A1 EP 3295107A1 EP 16723707 A EP16723707 A EP 16723707A EP 3295107 A1 EP3295107 A1 EP 3295107A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
sealing edge
honeycomb body
exchanger element
element according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16723707.2A
Other languages
German (de)
English (en)
Inventor
Katja Widmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ElringKlinger AG
ElringKlinger Kunststofftechnik GmbH
Original Assignee
ElringKlinger AG
ElringKlinger Kunststofftechnik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ElringKlinger AG, ElringKlinger Kunststofftechnik GmbH filed Critical ElringKlinger AG
Publication of EP3295107A1 publication Critical patent/EP3295107A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D19/00—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium
    • F28D19/04—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier
    • F28D19/041—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier with axial flow through the intermediate heat-transfer medium
    • F28D19/042—Rotors; Assemblies of heat absorbing masses
    • F28D19/044—Rotors; Assemblies of heat absorbing masses shaped in sector form, e.g. with baskets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • F28F2255/06—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes composite, e.g. polymers with fillers or fibres

Definitions

  • Heat exchanger elements in particular for
  • the invention relates to heat exchanger elements, in particular for the assembly of heat exchangers for flue gas purification systems of power plants, which are often equipped with a rotor having a plurality of chambers for receiving individual heat exchanger elements.
  • the heat exchangers in rotating design are often of the so-called Ljungström type.
  • the design according to the so-called Rothemühle principle is often used. Again, the heat exchanger elements are used individually in chambers.
  • the heat exchanger elements have a honeycomb body of a plastic material, which is preferably adapted to the geometry of the chambers.
  • the honeycomb body has a multiplicity of flow channels arranged parallel to one another, which are separated from one another via channel walls and extend from one end face of the honeycomb body to the opposite end face.
  • Heat exchanger elements of the type mentioned for use in flue gas purification plants of power plants are known for example from German Patent DE 195 12 351 Cl.
  • the heat exchanger elements disclosed therein are made of a polytetrafluoroethylene regenerate alone or in admixture with another plastic and optionally contain fillers.
  • the heat exchanger elements according to the invention are provided in particular for use in so-called Ljungström heat exchangers and heat exchangers according to the Rothemühle principle.
  • pure and raw gas flows are spatially separated from each other. routinely passed through the heat exchanger / rotor, which is equipped with the heat exchanger elements.
  • the heat exchanger elements are heated, the raw or flue gas cools down.
  • the heat exchanger elements release energy to the clean gas, the temperature of which rises while the heat exchanger elements cool down again.
  • the cold end position can be provided from the top or bottom side of the rotor in the lower region of the rotor (lower cold end layer) or in the upper region of the rotor (upper cold end layer).
  • the object of the invention is to propose a heat exchanger element with which at least reduce the tendency of the heat exchanger (rotors / stators) and their chamber walls and thus the intervals between the individual repairs and possibly even the life of the heat exchanger (rotors / stators) total can be extended so that they are considerably more economical in operation.
  • the heat exchanger elements according to the invention are equipped with a sealing edge, which is arranged in the region of an end face of the honeycomb body and substantially parallel thereto.
  • the sealing edge extends around the honeycomb body along the outside thereof.
  • the distance between the walls of a heat exchanger (rotor / stator) chamber and the heat exchanger element according to the invention or its honeycomb block can be minimized or completely eliminated in the region of at least one of the end faces. Because of a single sealing edge, it is surprisingly possible to concentrate the flow path of the raw gas through the heat exchanger to the areas of the heat exchanger elements so that the walls of the chambers of the heat exchanger in which the heat exchanger elements are placed, largely shielded from the corrosive components of the raw gas and their precipitation there is largely reduced, if not substantially avoided.
  • the heat exchanger elements of the present invention not only provide excellent corrosion protection, but also have very good heat transfer properties.
  • the sealing edge can for example be dimensioned so that from the sealing edge to the chamber wall a certain clearance of about 5 mm or less, preferably about 2 mm or less, remains.
  • the honeycomb block can comply with the heat exchanger wall a significantly greater distance, for example, about 10 mm.
  • sealing edge of the heat exchanger elements according to the invention is arranged adjacent to the end face of the heat exchanger element which is adjacent to the upper side of the rotor / stator (upper cold end position) or the bottom side of the rotor / stator (lower cold end position).
  • sealing edges can also be provided on both end faces of the heat exchanger element.
  • the sealing edge is formed integrally with the honeycomb body.
  • the sealing edge is formed as a separate component which is optionally connected to the honeycomb body in a positive, non-positive or cohesive manner. Furthermore, the sealing edge can be held on the honeycomb body via fastening elements.
  • the heat exchanger element according to the invention may have a sealing edge, which comprises an open honeycomb structure, wherein then the sealing edge is preferably made in one piece with the honeycomb body.
  • the honeycomb structure is covered at least partially with a sheet material, in particular a film, substantially gas-impermeable.
  • the open honeycomb structure could be closed by crimping or backfilling.
  • the heat exchanger element according to the invention can also have a sealing edge with a compact, substantially gas-impermeable structure.
  • the sealing edge of the heat exchanger elements according to the invention is preferably made of a plastic material, which is in particular selected from the plastic material of the honeycomb body and Perfluoralkoxypolymermate- rial (PFA).
  • a plastic material which is in particular selected from the plastic material of the honeycomb body and Perfluoralkoxypolymermate- rial (PFA).
  • the sealing edge is preferably dimensioned so that it rests on at least two opposite, radially extending side walls of a heat exchanger chamber. This can be achieved that the front sides of these side walls are protected.
  • the sealing edge is preferably dimensioned on two opposite sides of the honeycomb body in such a way that the sealing edge directly adjoins a sealing edge of a heat exchanger element adjoining in the circumferential direction of the rotor, more preferably overlaps it.
  • the sealing edge of the heat exchanger elements according to the invention is preferably formed in the region of a first outer side of the honeycomb body with a parallel to the outside recess on its upper side and in the region of the first outer side opposite the second outer side with a complementary recess on its underside, which is parallel extends to the second outer side of the honeycomb body.
  • interlocking elements can be formed, which enable a secured in the circumferential direction of the rotor positioning of the heat exchanger elements in the rotor.
  • the heat exchanger elements In the case of the heat exchanger elements with geometry formed complementary on two opposite outer sides, the heat exchanger elements mutually stabilize in their installed position in the heat exchanger, so that in a preferred embodiment of the heat exchanger on a plurality of partitions, which otherwise each form individual receiving chambers for the heat elements in the cold end can be dispensed with. This applies in particular to the installation of the heat exchanger elements according to the invention in an upper cold end position.
  • the sealing edge can be inventively formed as a carrier for the honeycomb body.
  • the sealing edge is designed as a carrier of the honeycomb body on two opposite outer sides of the honeycomb body with bearing surfaces which serve the support on or on a wall, for example, the wall of a receiving chamber, the rotor / stator of the heat exchanger.
  • the bearing surfaces are positioned on such outer sides of the honeycomb block, which extend substantially parallel to the radial direction of the heat exchanger.
  • the heat exchanger elements according to the invention can also be equipped with a holder in which the honeycomb body is received.
  • the holder can be dimensioned so that optionally further heat exchanger elements can be included.
  • the plastic material it is preferred that this comprises a plastic, the virginal polytetrafluoroethylene (PTFE) in a proportion of about 80 wt .-% or more and optionally a non-PTFE high-performance polymer in a proportion of about 20 wt .-% or less.
  • PTFE virginal polytetrafluoroethylene
  • the honeycomb bodies of the heat exchanger elements according to the invention also have mechanical strength values, in particular for tear strength and elongation at break, which significantly above those of conventionally manufactured honeycomb bodies.
  • a virgin PTFE having a melting enthalpy of about 40 J / g or more is used as the plastic.
  • the density of preferred PTFE materials is about 2.1 g / cm 3 or more.
  • the virgin PTFE to be used according to the invention may have a co-monomer content of about 1% by weight or less, preferably about 0.1% by weight or less.
  • Virgin PTFE materials having such a co-monomer content typically weldable without the addition of foreign material (eg PFA).
  • Typical co-monomers are hexafluoropropylene, perfluoroalkyl vinyl ether, perfluoro (2,2-dimethyl-l, 3-dioxole) and chlorotrifluoroethylene.
  • the virgin PTFE and optionally the high-performance polymer other than PTFE having an average primary particle size D 50 of about 10 ⁇ m to about 200 ⁇ m, preferably about 10 ⁇ m to about 100 ⁇ m, are preferably used.
  • these particle sizes can be in the production of honeycomb blocks in particular
  • Sintered PTFE which also includes PTFE Regenerate, can only be obtained with particle sizes of about 400 pm or greater due to the lower crystallinity compared to virginal PTFE.
  • the primary particle size is referred to above since particle agglomerates of virgin PTFE with significantly larger particle sizes can also be processed, provided that the particle agglomerates break down into their primary particles under the processing conditions.
  • particle agglomerates with particle sizes of 100 pm to 3000 pm can be used if they decompose into the primary particles at about 150 bar or less.
  • Suitable fillers include both non-metallic and metallic fillers, which can also be used in a mixture. Not only particulate fillers but also fibrous fillers come into question as fillers. In particular, both the thermal conductivity and the heat capacity of the plastics material to be used according to the invention can be mixed with the fillers. materials and optionally also optimize the mechanical properties of the heat exchanger elements according to the invention.
  • the plastic material contains a non-metallic filler and / or a metallic filler, wherein the average particle size D 50 of the respective filler is preferably about 100 pm or less.
  • the particle size of the fillers will be about 2 ⁇ m to about 300 ⁇ m, preferably about 2 ⁇ m to about 150 ⁇ m, in view of the desired uniform distribution in the plastic material.
  • the ratio of the average particle size D 50 of the primary particles of the plastic or of the plastics to the average particle size D 50 of the fillers is preferably in the range from about 1: 2 to about 2: 1.
  • the non-metallic filler is present in a proportion of up to about
  • the total volume fraction of the fillers in the plastic material should preferably be about 50% by volume or less, more preferably about 40% by volume or less.
  • the plastic material processed to the honeycomb body has a tensile strength of about 10 N / mm 2 or more, measured according to ISO 12086-2 with a strip-shaped test body with a cross section of 1 x 5 mm 2 .
  • the tensile strength of the plastic material of the honeycomb body in these strip-shaped specimens is preferably 15 N / mm 2 or more, more preferably about 20 N / mm 2 or more, even more preferably about 25 N / mm 2 or more.
  • the tear strength will be about 35 N / mm 2 or less.
  • the elongation at break of the plastic material processed to the honeycomb body measured according to ISO 12086-2 on a strip-shaped test specimen having a cross-section of 1 ⁇ 5 mm 2 , is about 80% or more, in particular about 100% or more, more preferably about 150% or more, most preferably about 200% or more.
  • honeycomb bodies are available with very cleanable surfaces, for which purpose the average roughness Ra of the surfaces of the honeycomb body, measured according to DIN EN ISO 1302 in the longitudinal direction of the honeycomb channels, about 10 m or less, preferably about 5 pm or less.
  • the roughness depth Rz of the surfaces of the honeycomb body measured according to DIN EN ISO 1302 in the longitudinal direction of the flow channels of the honeycomb body, is approximately 50 ⁇ m or less, in particular approximately 40 ⁇ m or less, preferably approximately 30 ⁇ m or less , most preferably about 20 pm or less.
  • the heat exchanger elements according to the invention or their honeycomb body preferably have a plastic material with a thermal conductivity of approx.
  • the heat exchanger elements according to the invention or their honeycomb bodies preferably have a plastic material with a heat capacity of approx.
  • the thermal conductivity and the heat capacity favor an effective heat exchange between the heat exchanger elements and the flue gas flowing through and the storage capacity of the heat exchanger element.
  • the flow channels of the honeycomb body have a polygonal, in particular a square or hexagonal, cross section.
  • the channel walls of the flow channels of the honeycomb body preferably have a thickness of about 0.8 mm to about 2 mm.
  • the open cross-sectional area of the flow channels of a honeycomb body preferably adds up to about 75% or more of the base area of the honeycomb body.
  • the heat exchanger elements which serve the assembly of the receiving chambers of a rotor are typically required in several different dimensions of their bases. This can be achieved simply by first producing honeycomb blocks with a smaller footprint as standard and then joining them together to form the larger honeycomb bodies.
  • the flow channel geometry may, for example, have a hexagonal cross section with an edge length of about 7.2 mm or more.
  • connection of the honeycomb blocks to a honeycomb body of a heat exchanger element which can be handled as a whole can be effected mechanically, for example by means of a positive or a force fit, or by material bonding, for example by gluing or welding.
  • the heat exchanger element and its honeycomb body can also be adapted in their geometry to the requirements by cutting or sawing and in particular in a plane perpendicular to the longitudinal direction of the flow channels wedge-shaped.
  • the parts of the honeycomb structures which have been severed during the blanking of the honeycomb blocks or honeycomb structures can readily be connected to a honeycomb block in the manner already described in order to produce further heat exchanger elements.
  • the invention also relates to heat exchangers for flue gas purification systems which include a plurality of heat exchanger elements of the present invention.
  • the heat exchangers have an annular receiving space or a plurality of circumferentially successive ring segment-like receiving spaces in which a plurality of the heat exchanger elements according to the invention are accommodated, wherein the heat exchanger elements are connected to each other in a form-fitting manner in the circumferential direction.
  • a sealing edge is preferably provided adjacent to both end faces, wherein a structure of the sealing edge for the positive connection of a heat exchanger element with an adjacent heat exchanger element only at one of the sealing edges, the above Ren or the lower end face of the heat exchanger element is assigned, is necessary.
  • one of the sealing edges is integrally formed on the honeycomb body, while the second sealing edge is made as a separate part.
  • Figure 1A is a schematic representation of a coal power plant with a flue gas cleaning system
  • FIG. 1B shows a variant of the flue gas purification system of FIG. 1A
  • FIGS. 2A to 2C show schematic representations of three variants of a rotor for accommodating heat exchanger elements according to the invention
  • FIG. 3 shows an enlarged section of FIG. 2A
  • FIGS. 4A to 4D show a schematic representation of two heat exchanger elements according to the invention which are to be positively connected to one another;
  • FIGS. 5A to 5C show schematic illustrations of further variants of a heat exchanger element according to the invention.
  • FIGS. 6A and 6B show further variants of heat exchanger elements according to the invention, which are used positioned in a holder;
  • FIG. 7A shows a further variant of a heat exchanger element according to the invention when inserted into a rotor chamber; and
  • FIG. 7B shows a variant of the heat exchanger element according to the invention adapted to a modified rotor.
  • FIG. 1A shows a schematic representation of a coal-fired power plant 10 with a burner 12 and a flue-gas purification system 14.
  • the burner 12 comprises a boiler 16 with a combustion chamber 18, to which coal in ground form via a fuel supply line 20 and combustion air via a feed line 22 are supplied.
  • a steam generator 24 is arranged in the boiler 16, in which for the operation of a steam turbine 26 water vapor is generated.
  • the steam turbine 26 drives a power generator, not shown.
  • the resulting during combustion of the coal in the combustion chamber 18 flue gas is removed via a flue gas pipe 28 from the boiler 16.
  • the combustion air is passed via the supply line 22 before feeding into the combustion chamber 18 of the boiler 16 via a heat exchanger 30 and heated there by the flue gas fed via the flue gas line 28.
  • the heat exchanger has a supply air region 32 and a flue gas region 34.
  • the zone at which the temperature of the flue gas is lower, is particularly susceptible to corrosion. This zone is also called Kaltendlage. Due to the flow through the heat exchanger 30 with the flue gas from top to bottom, the cold end is down.
  • a rotor 36 is equipped with a heat storage and tragungsmedium over-loaded, which absorbs heat when passing through the flue gas region 34 from the flue gas passed therethrough and emits heat when passing through the opposite supply air region 32 to the combustion air flowing therethrough.
  • the temperature of the flue gas drops when passing through the heat exchanger 30, for example, from about 250 ° C to about 160 ° C, while the temperature of the supply air from ambient temperature to, for example, about 150 ° C increases.
  • the diameter of the rotor 36 is often in the range of 5 m to 25 m, depending on the required heat exchanger capacity.
  • the weight of a fully charged with a heat storage and transmission medium Depending on the size of the mounted rotor, it may be 1000 tons or more, especially if only a conventional medium based on enamelled steel sheets is used.
  • the cooled flue gas is fed to dedusting through line 29 to an electrostatic particle separator, hereinafter referred to as ESP unit 44 for short.
  • the treated (largely dusted) flue gas via a line 48 a regenerative heat exchanger 50, also called REGA- VO supplied, in which the processed flue gas, for example, from about 160 ° C to a temperature of about 90 ° C or lower is cooled further.
  • a regenerative heat exchanger 50 also called REGA- VO supplied, in which the processed flue gas, for example, from about 160 ° C to a temperature of about 90 ° C or lower is cooled further.
  • the heat exchanger 50 contains a rotor 52 equipped with a heat storage and transfer medium, which receives the heat emitted by the dedusted flue gas, which for this purpose passes through a first region 54 of the heat exchanger 50 or through the rotor 52 from bottom to top and then fed via line 62 to a flue gas desulfurization system 64.
  • the temperature of the dedusted flue gas sinks during passage through the first region 54 of the heat exchanger 50 for example from about 150 ° C to about 85 ° C to about 90 ° C.
  • the so-called cold end layer 58 is above.
  • the desulfurized flue gas coming from the flue gas desulphurisation plant 64 still has a temperature in the range of, for example, about 40.degree. C. to about 50.degree.
  • the heat storage and transfer medium heated by the raw gas becomes the cooler gas stream of the desulphurised flue gas (Clean gas) brought into contact.
  • the clean gas via the line 66 in the area 56 of the heat passed exchanger 50 in countercurrent while heated to about 90 ° C to about 100 ° C.
  • a line 68 leads the desulfurized, reheated flue gas to the chimney 70.
  • the flue gas has a sufficiently large buoyancy to from the chimney into the atmosphere reach.
  • Ljungström gas preheaters are used as heat exchangers, which are equipped with a rotor 36 and 52, the heat transport from the flue gas to the supply air or from the first into the take over the second region of the respective heat exchanger 30 and 50, respectively.
  • FIG. 1B shows a variant of the flue gas desulphurisation system 14, in which the line 68 coming from the heat exchanger 50 leads to a heat exchanger 72, to which a so-called SCR unit 76 connects via a line 74, which preferably also has a section 78 with a heat exchanger 72 Flue gas extraction function (DeNOx) includes.
  • the desulfurized flue gas which still contains NOx fractions, passed through the heat exchanger 72 for preheating. So that the NOx-containing desulfurized flue gas reaches the temperature required in the following SCR process of about 150 ° C to about 190 ° C, the heat exchanger 72 typically has a greater height.
  • the heat storage elements used in the heat exchanger 72 must have a high corrosion resistance, since excess ammonia reacts with existing sulfur trioxide and water and forms ammonium bisulfate. Together with fly ash still contained in the flue gas, the ammonium bisulfate forms a sticky precipitate, which deposits on all rotor / stator parts and has to be washed out regularly.
  • the heat exchanger 72 includes a rotor 84, in the cold end 86 of which heat exchanger elements according to the invention are again arranged.
  • FIG. 2A schematically shows a heat exchanger in the form of the disk-shaped rotor 100, whose diameter may be 20 m or more.
  • the volume of the disc-shaped rotor 100 is bounded by a cylindrical outer wall 102 and divided into a plurality of chambers 104, 105, 106, 107, 108, 109 with a substantially trapezoidal plan.
  • the division takes place on the one hand by means of a plurality of radially extending partitions 110, 112 and on the other hand by means of concentric with the outer wall formed cylinder walls 114, 115, 116, 117, 118 and the inner wall 119th
  • the chambers 104, 105, 106, 107, 108, 109 can be equipped with replaceable, size-adapted heat exchanger elements 130 according to the invention, which are arranged in this embodiment in an upper cold end position.
  • Such heat exchanger elements 130 have a honeycomb body 132, which is penetrated by a plurality of flow channels 152, which run parallel to the axial direction of the rotor 100, as will be explained in more detail with reference to FIG.
  • chambers 104 are shown in a partially broken view, wherein support strips 103 are provided on the lower end of the chamber walls 110 in a variant, on which according to another embodiment of the invention heat exchanger elements can be placed in the lower cold end position.
  • the heat exchanger elements can also be held with block-shaped holding elements 169 in the lower cold end position.
  • FIG. 2B shows a rotor 100 'which, in its lower region (hot end position), which extends, for example, over approximately two thirds of the height of the rotor 100', into receiving chambers 104 ', 105', 106 ', 107', 108 '.
  • 109 ' is divided by radially and circumferentially extending partition walls 110', 112 'and cylinder walls 114', 115 ', 116', 117 ', 118' concentric with the outer wall 102 'and the inner wall 119'.
  • the upper third of the volume of the rotor 100 '(upper cold end layer) is bounded on the one hand via the outer wall 102' and the cylindrical inner wall 119 '.
  • This annular space is divided into four ring segments only by four radially extending walls 122 ', 123', 124 ', 125' having the same height as the inner wall 119 'and the outer wall 102'.
  • a plurality of heat exchanger elements according to the invention are received, as will be described below, which are preferably connected to one another via form-locking elements at their circumferentially adjacent sealing edges.
  • This variant of the rotor 100 'means a significantly lower use of material in the production of the rotor or of its receiving chambers, so that the rotor itself already has a lower weight.
  • FIG. 2C A further variant of a rotor 100 "is shown in FIG. 2C, which is constructed similarly to the rotor 100 'in FIG. 2B, in which the rotor volume to be filled with heat exchanger elements is limited on the one hand by the outer wall 102" and the cylindrical inner wall 119 "
  • the division of the rotor volume into receiving chambers as shown in Figures 2A and 2B is maintained, again with the circumferential or radial partitions 114", 115 “, 116", 117 “. , 118 “, 110", 112 ".
  • the receiving chambers 104", 105 “, 106", 107 “, 108” and 109 formed thereby receive heat exchangers. shear elements for the warm end layer area, as already described in connection with the Figure 2A and Figure 2B.
  • the cylindrical partition wall 116" is formed at the same height as the outer wall 102 "and the inner wall 119" so as to be located between the radial partition walls 122 ", 123", 124 "and 125” Ring segments again divided radially into two areas.
  • this circular partition wall 116 "serves, as is also true for the radial partition walls 122", 123 “, 124" and 125 “, to improve the mechanical stability thereof, in particular for large rotor dimensions.
  • heat exchanger elements according to the invention which are on the one hand positively connectable, used in a preferred trapezoidal layout on the other hand, after placement of the rotor / stator additionally exact positioning of the individual heat exchanger elements, which waives the separation walls to form individual receiving chambers for allows the individual heat exchanger elements.
  • the heat exchanger elements to be used in the rotors 100 'and 100 "preferably have a sealing edge in the region of both end faces, of which the upper sealing edge is preferably formed integrally with the honeycomb body of the heat exchanger elements.
  • the lower sealing edge can serve to cover the upper end faces of the partitions in the region of the transition from the hot to the cold end position.
  • FIG. 3 shows a detail of the rotor 100, in which a part of the chambers 105 is equipped with heat exchanger elements 130.
  • the heat exchanger elements 130 have a honeycomb body 132, which is provided on its four outer sides 134, 135, 136, 137 at the level of its upper end face 138 with a peripheral sealing edge 140 which is formed integrally with the honeycomb body 132 and in its basic structure also honeycomb-shaped ,
  • the heat exchanger element 130 according to the invention in the form of the honeycomb body 132 and the basic structure of the sealing edge 140 can be made in one piece from a correspondingly larger sized honeycomb block.
  • the sealing edge 140 can assume a further function, namely that of a carrier of the heat exchanger element 130.
  • the honeycomb-shaped basic structure of the sealing edge 140 must still be covered gas-impermeable. This can be done very easily with a surface material which is applied to the basic structure of the sealing edge 140.
  • a surface material which is applied to the basic structure of the sealing edge 140.
  • One of the preferred sheet materials is a sheet of plastic material, such as PTFE. If required, the surface material can be connected to the basic structure by gluing or welding.
  • the honeycomb-shaped basic structure of the sealing edge 140 could be pressed or also gas-impermeable filled with a filling material (not shown).
  • the sealing edge 140 is designed such that, after a heat exchanger element 130 has been inserted from above into a rotor chamber, it covers the upper side of the rotor walls surrounding the rotor chamber (here, for example, the rotor walls 110, 114 and 116 the rotor chamber 105) covers and also shields these tops from the corrosive substances of the flue gas.
  • FIG. 3 shows the insertion of a heat exchanger element 130 according to the invention in several phases.
  • the sealing edge 140 is provided on two opposite outer sides of the honeycomb body 132 at the top and at the bottom, each with a recess 142, 144, so that the sealing edges 140 of two adjacent in the circumferential direction of the rotor heat exchanger elements 130 each other in a planar configuration can overlap.
  • the sealing edge 140 unfolds its protective effect for the material of the rotor walls, although it is not arranged on the inflow side of the heat exchanger element 130 but on the outflow side, since due to the sealing edge 140 of the flow path is limited to the flow channels of the honeycomb body 132.
  • Figure 4A shows two heat exchanger elements 130 laterally aligned shortly before the connection via the sealing edges 140 on their outer sides 134 and 136.
  • the sealing edge 140 has in its along the outer side 134 extending portion at its top a recess 142, while in his along the outside 136 extending portion at the bottom a recess 144 is formed.
  • the recesses 142, 144 preferably extend along the respective entire section of the sealing edge 140.
  • FIG. 4D shows an enlarged view of a detail of the overlapping sealing edges 140, in which the interlocking elements 146 and 148 can be clearly seen in their cooperation.
  • the film 150 placed between the recesses 142, 144 is also clearly visible as a gas-impermeable surface element.
  • the gas-impermeable cover it is generally sufficient to provide only one film layer, which can either be inserted during assembly between the sealing edges 140 of adjacent heat exchanger elements 130 or before assembly to the sealing edge 140 only one of the heat exchanger elements 130 (eg Gluing or welding) is attached.
  • FIG. 4B this is the case on the sealing edge 140 shown on the left in the image.
  • the film 150 even if it is inserted only between the overlapping sealing edges 140 of the adjacent heat exchanger elements 130, sufficiently fixed solely by the weight of the heat exchanger elements 130, which are supported with their sealing edges 140 on the rotor walls 110.
  • the honeycomb bodies 132 have a multiplicity of parallel flow channels 152 which extend from one end face 138 to the opposite end face.
  • the cross-sectional area of the flow channels 152 is hexagonal in the embodiments shown.
  • a flow channel wall thickness of 1.2 mm results in a distance of the opposing flow channel walls of 14.3 mm (expansion of the channel walls in each case about 7.2 mm), a free cross-section for the passage of gases through the honeycomb body 132 of approx. 83% based on the base area of the honeycomb body 132.
  • the specific surface area is about 150 m 2 / m 3 .
  • the heat exchanger elements or their honeycomb body are often not made as a block, but it is depending on the required size first several, for example two or four, cuboid honeycomb blocks made and connected together, in particular welded together, and then by cutting in the required trapezoidal or wedge shape made the heat exchanger elements 130.
  • FIGS. 5A to 5C An alternative embodiment of a heat exchanger element 130 'according to the invention is shown in FIGS. 5A to 5C.
  • the honeycomb body 132 'and the sealing edge 140' are each made as separate components, which can be assembled before or even during assembly of the heat exchanger elements 130 'in the receiving chamber of the rotor.
  • the separately produced sealing edge 140 ' as shown in FIGS. 5A to 5C, is typically made with a compact, gas impermeable structure.
  • FIGS. 5A to 5C show a heat exchanger element 130 ', which in turn is designed for an upper cold end position.
  • the honeycomb body 132 ' has for receiving the sealing edge 140' in a form-fitting manner on the outer sides 134 ', 135', 136 'and 137' encircling recess 160, starting from the upper end face 138 '.
  • FIG. 5A shows the two separately manufactured components, ie. the honeycomb body 132 'and the sealing edge 140' prior to assembly, while the two components are shown in the assembled state in Figure 5B.
  • the sealing edge 140 ' In order to fulfill a function as a carrier, the sealing edge 140 'should preferably in addition to the positive connection still cohesively with the honeycomb body 132' are connected, for example by welding or gluing. As an alternative to the cohesive connection, fixing can also be effected using fastening means, as shown by way of example in FIG. 5C.
  • fastening means As shown by way of example in FIG. 5C.
  • the design of the sealing edge on two opposite sections or outer sides of the honeycomb body 132 ' is similar to the sealing edge 140 of the heat exchanger elements 130.
  • the sealing edge 140' therefore has on one side 134 'of the honeycomb body 132' at its top a return 142 'on while on the opposite side 136 'of the honeycomb body 132' of the sealing edge has a recess 144 'on its underside.
  • the sealing edge sections of adjacent heat exchanger elements 130 ' can be received in the rotor in overlapping fashion with the recesses 142' and 144 '.
  • FIG. 6A shows a further alternative embodiment of a heat exchanger element 200 according to the invention, which has a holder 206 in addition to a honeycomb body 202 and a sealing edge 204.
  • the holder preferably has a cage-like frame structure, as shown for example in Figure 6A.
  • the holder 206 is preferably dimensioned so that it extends substantially over the entire height of the rotor 100 (see Figure 2A) and seen next to the honeycomb body 202 in the flow direction of the rotor another heat exchanger component (not shown) for the final heat position on the Heat exchanger element 200 can accommodate aligned.
  • the sealing edge 204 of the heat exchanger element 200 can, if it is used in an upper cold end position, again be formed as a support for the heat exchanger element 200 as a whole, which is supported on the end faces of the rotor walls 110.
  • the honeycomb body 202 and the sealing edge 204 are manufactured here as separate components, whereby the assembly, in particular the integration of a further heat exchanger component arranged below the honeycomb body 202, can be accomplished in a simple manner.
  • the sealing edge 204 on the honeycomb body 204 can also be fixed to the holder 206. Again, this can be cohesive, positive or non-positive.
  • the heat exchanger element 200 can also be held via the holder 206 in a rotor chamber, which is supported on support strips 103 or block-shaped holding elements 169 (see FIG.
  • FIG. 6B shows an exemplary embodiment of a heat exchanger element 220 according to the invention with a honeycomb body 222, a sealing edge 224 and a holder 226.
  • the honeycomb body 222 is used in the rotor 100 in a lower cold end position.
  • the sealing edge 224 is then supported on support strips 103 or block-shaped retaining elements 169 (see FIG. 2A) in the respective rotor chamber.
  • the honeycomb body 222 is still shown in a raised position in FIG. 6B.
  • the honeycomb body 222 sits in its final position on transverse webs 228, 229 of the holder 226.
  • the sealing edge 224 is arranged here below on the holder 226 and optionally fixed thereto, so that the heat exchanger element 220 can be handled as a whole. Alternatively, it can also be provided to form the sealing edge 224 as a separately manageable element, which during assembly of the Heat exchanger element 220 is initially used alone in a rotor chamber. Only then are the other components of the heat exchanger element 220, ie. the honeycomb body 222 installed in the holder 226, optionally together with a further heat exchanger component (not shown), inserted into the rotor chamber.
  • the sealing edge 224 preferably has recesses 230, 231 on its underside, into which the support strips 103 or the block-shaped holding elements 169 engage during assembly.
  • the sealing edge 224 itself is preferably made with a compact, substantially gas-tight structure.
  • FIG. 7A shows a further embodiment of a heat exchanger element 250 according to the invention with a honeycomb body 252 and a sealing edge 254 for mounting in a lower cold end position of the rotor 100 (see FIG.
  • the rotor chamber 104 has on its lower edge on opposite sides the block-shaped retaining elements 169 already described in connection with FIG. 2A, in whose place of course differently configured retaining elements, for example the support strips 103 also shown in FIG. 2A, can be used ,
  • Figure 7A shows the sealing edge 254 still in the raised position above the lower edge of the rotor chamber 104 and the holding elements 169.
  • the sealing edge is maintained as a separately manageable part and is first inserted into the rotor chamber 104. Only then is the honeycomb body 252 placed on the sealing edge 254. A firm connection between the sealing edge 254 and the honeycomb body 252 can be omitted, since the positioning of the honeycomb body 252 on the sealing edge 254 is already sufficient gas-impermeable by the weight of the honeycomb body 252.
  • the sealing edge 254 has recesses 258, 259 at opposite sections on the underside, into which the holding elements 169 can engage.
  • the sealing edge 254 can be connected to the honeycomb body 252 before or even after assembly in the rotor chamber 104, wherein in turn a cohesive, non-positive and / or positive connection can be selected, in particular also the variants described in connection with FIGS 5A to 5C have been described.
  • the sealing edge 254 unfolds its protective effect for the material of the rotor walls, although it is not arranged on the inflow side of the heat exchanger element 250, but on the outflow side of the rotor 100.
  • FIG. 7B shows an installation situation for heat exchanger elements 250 according to the invention in an upper cold end position in a rotor 100 'or 100 ", in which radial partition walls and the inner wall ring or ring segment are formed by the outer wall 102', 102" and (not shown here). shaped receiving areas for the heat exchanger elements 250 according to the invention are formed.
  • heat exchanger elements according to the invention are again used which are used here in the form of the heat exchanger elements 260 with a honeycomb body 262 and a sealing edge 264, wherein the sealing edge 264 is preferably designed as a component that can be handled separately.
  • the honeycomb body 262 has on its lower end face a recirculating recess 266 which can be inserted into the sealing edge 264.
  • the sealing edge 264 in turn is formed on two opposite sides in the circumferential direction of the rotor 100 ', 100 ", with a configuration with recesses on the upper side and the underside, which additionally with positive locking elements, here for simplicity with the reference numeral 274 indicated, are provided.
  • the heat exchanger elements 260 additionally have sealing edges (not shown) on their upper end side which, adjacent to one another at the upper side of the heat exchanger 100 ', 100 ", result in a substantially closed structure between adjacent heat exchanger elements 260.
  • sealing edges arranged on the upper side are preferably formed integrally with the honeycomb body 262, so that the handling of the heat exchanger elements 260 when installed in the rotor 100 ', 100 "is simplified.
  • concentrically arranged rings of heat exchanger elements 260 can be accommodated in the rotor 100 ', 100 ", which retain an exact positioning on the one hand due to the special structure of the sealing edges 264, on the other hand also because of the trapezoidal layout design the heat exchanger elements 260.
  • Wall elements, as used in other embodiments, to form individual receiving chambers for the heat exchanger elements 260 are, as apparent from this embodiment, obviously not required, so that the formation of chambers within the rotors 100 ', 100 "on the Area of the so-called warming end position, thus resulting in considerable material savings, and consequently also a reduction in weight. ken for the corrosion of the rotor 100 ', 100 "or of its components significantly reduced.
  • the heat exchanger elements according to the invention must be regularly cleaned due to the entry of corrosive gases and ash particles through the flue gas - even in its treated, dedusted form, so that the simple and safe handling of these elements on the one hand, but also the simple cleaning of the honeycomb on the other hand of great importance .
  • the heat resistance of the PTFE material is also important in view of the temperatures of the flue gases occurring at the heat exchangers, for example about 250 ° C.
  • the parameters of the heat capacity and the thermal conductivity of the heat storage and transfer media used are of crucial importance.
  • the present invention also addresses these issues by selecting the plastic materials and optionally the fillers for making the heat exchanger elements or the honeycomb blocks made for making them.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Air Supply (AREA)

Abstract

L'invention concerne un élément d'échange de chaleur destiné à des échangeurs de chaleur d'installations d'épuration de gaz de combution de centrales électriques, et se caractérise en ce que ledit élément d'échange de chaleur est conçu sous la forme d'une structure en nid d'abeille formant bloc présentant quatre faces extérieures et deux faces d'extrémité sensiblement parallèles, ainsi qu'un bord d'étanchéité. La structure en nid d'abeille est constituée d'une matière plastique comprenant une pluralité de canaux d'écoulement disposés parallèlement, lesdits canaux étant séparés les uns des autres par des parois de canaux. Les canaux d'écoulement s'étendent d'une face d'extrémité à l'autre et le bord d'étanchéité est disposé dans la zone de l'une des faces d'extrémité et orienté de manière sensiblement parallèle à cette face d'extrémité, ledit bord s'étendant sur la périphérie de la structure en nid d'abeille dans le sens opposé à celle-ci.
EP16723707.2A 2015-05-12 2016-05-11 Éléments d'échange de chaleur, destinés notamment à des installations d'épuration de gaz de combustion de centrales électriques Withdrawn EP3295107A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015107476.1A DE102015107476A1 (de) 2015-05-12 2015-05-12 Wärmetauscherelemente, insbesondere für Rauchgasreinigungsanlagen von Kraftwerken
PCT/EP2016/060537 WO2016180867A1 (fr) 2015-05-12 2016-05-11 Éléments d'échange de chaleur, destinés notamment à des installations d'épuration de gaz de combustion de centrales électriques

Publications (1)

Publication Number Publication Date
EP3295107A1 true EP3295107A1 (fr) 2018-03-21

Family

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Application Number Title Priority Date Filing Date
EP16723707.2A Withdrawn EP3295107A1 (fr) 2015-05-12 2016-05-11 Éléments d'échange de chaleur, destinés notamment à des installations d'épuration de gaz de combustion de centrales électriques

Country Status (5)

Country Link
US (1) US10443961B2 (fr)
EP (1) EP3295107A1 (fr)
CN (1) CN107592906A (fr)
DE (1) DE102015107476A1 (fr)
WO (1) WO2016180867A1 (fr)

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3789916A (en) * 1971-04-06 1974-02-05 Munters Ab Carl Rotor for exchangers of the thermodynamic characteristics of two gas currents
GB1452290A (en) * 1973-10-24 1976-10-13 Advanced Materials Eng Rotor for rotary regenerative heat exchanger
DE3503607A1 (de) * 1985-02-02 1986-08-07 Apparatebau Rothemühle Brandt + Kritzler GmbH, 5963 Wenden Formkoerper aus kunststoff zur regenerativen waermeuebertragung in waermeaustauschern sowie hieraus gebildete waermespeichermasse
US4642993A (en) * 1985-04-29 1987-02-17 Avco Corporation Combustor liner wall
US4832999A (en) * 1987-10-27 1989-05-23 Avco Lycoming/Textron Honeycomb structure assemblies
US5152184A (en) * 1990-11-28 1992-10-06 Ofi Testing Equipment, Inc. Thermal test liner apparatus and method
DE19512351C1 (de) 1995-04-01 1996-11-14 Poehlmann Klaus Ernst Wabenblock aus wärmebeständigem Speichermaterial für Wärmetauscher
CA2316827C (fr) * 1998-01-06 2005-11-08 Donald F. Steele Roue rotative d'echange thermique
US6527837B2 (en) * 2000-03-30 2003-03-04 Nichias Corporation Rotor and sealing device for rotary adsorber
JP2010271031A (ja) * 2009-04-23 2010-12-02 Ngk Insulators Ltd セラミックス熱交換器、及びその製造方法
DE102012203278A1 (de) 2012-03-01 2013-09-05 Sgl Carbon Se Rotationswärmetauscher mit Wärmetauscherplatten oder Wärmetauscherrohren aus Kohle- und Graphitwerkstoffen
DE102012109184A1 (de) * 2012-09-27 2014-03-27 Ingo Zell Trägerplatte eines Werkstückträgersystems sowie Werkstückträgersystem

Also Published As

Publication number Publication date
DE102015107476A1 (de) 2016-11-17
WO2016180867A1 (fr) 2016-11-17
CN107592906A (zh) 2018-01-16
US20180066903A1 (en) 2018-03-08
US10443961B2 (en) 2019-10-15

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