EP0790460A2 - Chaudière de récupération avec des tubes à ailettes - Google Patents

Chaudière de récupération avec des tubes à ailettes Download PDF

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Publication number
EP0790460A2
EP0790460A2 EP97102155A EP97102155A EP0790460A2 EP 0790460 A2 EP0790460 A2 EP 0790460A2 EP 97102155 A EP97102155 A EP 97102155A EP 97102155 A EP97102155 A EP 97102155A EP 0790460 A2 EP0790460 A2 EP 0790460A2
Authority
EP
European Patent Office
Prior art keywords
tubes
boiler
row
finned
flow
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Withdrawn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
EP97102155A
Other languages
German (de)
English (en)
Other versions
EP0790460A3 (fr
Inventor
Piero De Martino
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.)
ABB Combustion Engineering SpA
Original Assignee
ABB Combustion Engineering SpA
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 ABB Combustion Engineering SpA filed Critical ABB Combustion Engineering SpA
Publication of EP0790460A2 publication Critical patent/EP0790460A2/fr
Publication of EP0790460A3 publication Critical patent/EP0790460A3/fr
Withdrawn legal-status Critical Current

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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
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/10—Water tubes; Accessories therefor
    • F22B37/101—Tubes having fins or ribs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media

Definitions

  • the invention relates to a waste heat boiler which is equipped with finned tube groups, in which finned tubes a medium to be heated, for example water or steam, flows.
  • Hot exhaust gases generally flow through the finned tube groups provided in the vertically arranged waste heat boilers from bottom to top, and the amount of heat contained is transferred to the tubes by the stream flushing the fins.
  • the finned tubes of a horizontal row have hitherto been arranged offset in relation to the finned tubes of a subsequent row, ie offset in the manner of a chessboard, according to the prior art.
  • the invention is based on the object of eliminating the disadvantages mentioned and related to the prior art and simple and inexpensive means to propose, with which the entire hot gas flow can be led through the spaces delimited by the finned tubes and the hot gas flow is prevented from flowing in an uncontrollable manner along the free channels between the adjacent finned tubes, but rather it is achieved that the entire gas flow flows completely into the spaces formed between the fins in order to give off the greatest possible amount of heat to the medium flowing in the boiler tubes and thus to significantly increase the heat exchange coefficient of the boiler.
  • the invention has for its object to propose structurally simple means that can be quickly installed in the boiler for holding the finned tube groups.
  • the finned tubes arranged in a first horizontal row are arranged in alignment with the tubes of the following rows, in which between two funnel-shaped outlet region of the hot gases formed adjacent tubes, the apex of a V-shaped baffle is arranged, which extends over the entire length of the tubes, and that the free ends of the baffle face the lower circumference of the finned tubes arranged above.
  • the baffles advantageously have a tulip-shaped cross section, the apex of the V-shaped baffle penetrating between the ribs of two tubes arranged below, while the upper part of the baffle extends over a curved area and adjoins tapering end sections, some of which follow the circumference of the overhead pipes.
  • the hot gas mass (curve 100) which flows around the fins 2 in a known boiler gradually increases from an area A to an area G and then gradually decreases to the point O.
  • Curve 101 of the diagram shows that the usable free space formed between the rows of fins, which could be traversed by the exhaust gases and which would have been available for direct heat exchange, is considerably smaller than the total flow cross section.
  • the chain line 102 shows that in the conventional arrangement of the pipes 1 shown in FIG. 3, an average of 18% of the hot gas flow Z penetrates between the fins 2, so that only this small proportion of the hot gas flow Z can be used directly for the heat exchange.
  • FIG. 5 shows the tubes 1 arranged along a horizontal axis A with the corresponding ribs 2.
  • the tubes are no longer offset from one another, but advantageously arranged in a row.
  • the tubes 1 are arranged in alignment with one another with a vertical axis D, in other words, the tubes are arranged in horizontal groups along the axes A and B, with the rule that the tubes 1 are not displaced in the vertical direction to arrange; it is proposed to arrange the tubes 1 of each vertical column in alignment along a common axis D.
  • the hot gas stream Z is fed from below as usual in the direction of arrow f. It is furthermore provided that in the region of the upper circumference of the ribs 2, from two adjacent tubes 1, a funnel-shaped space 4, shaped sheets 5 for current deflection are arranged.
  • the guide plates 5 can have different shapes and, in their simplest embodiment, are V-shaped.
  • the V-shaped baffles 5 extend above the tubes 1 provided with ribs 2 over the entire length of the tubes.
  • each guide plate 5 penetrates into the free and funnel-shaped, formed between the two tubes 1 provided with ribs 2 Space 4, this means that the apex 6 of each guide plate 5 is aligned with the horizontal axis A or B of the corresponding horizontal row of tubes 1.
  • the free ends of the V-shaped baffles 5 face the tubes 1 or the ribs 2 of the upper row of tubes 1.
  • the legs forming the guide plate 5 collide in a particularly advantageous manner at an angle ⁇ of approximately 70 °.
  • the free ends of the guide plates 5 leave a distance D, which represents a constriction and allows the exhaust gases to flow through.
  • FIG. 6 shows a front view of the flow of the gas stream Z supplied from below (arrow f) upwards. It can be seen from FIG. 6 that one half of the circumference of the tube 1 has been subdivided into individual sections AM and that the hot gas stream, when leaving the guide plates 5 below, is divided into two partial streams which wash around the tube 1 and the fins 2. In the diagram according to FIG. 7, the behavior of the hot exhaust gas flow along the sections AM shown. It can be seen from the diagram in FIG.
  • the proportion (curve 201) of the hot gas flow Z flowing through the fins 2 corresponds to a value of approximately 70% in the area of point A.
  • This proportion slowly decreases and reaches a minimum value in the vicinity of the measuring points c and D, while a maximum value is again reached in the area of the points HI, which then decreases again in the area of the last measuring point M.
  • the hot gas flow (curve 203) flowing through the spaces formed by fins corresponds on average to approximately 65% of the total gas flow that flows between the fins 2 of the tube 1 (curve 202). If one now looks again at the flow model of the exhaust gases for an embodiment according to FIG.
  • baffles for the exhaust gas flow which are characterized by a simple V-like shape, the invention also proposes further developed baffles 5, shown in FIG.
  • the guide plates 5 shown in FIG. 9 have a tulip shape, the apex of the V-shaped guide plate penetrating between the rows of ribs from two tubes 1 arranged below and following the upper part of the course of the ribs 2 in order to connect to end sections via a curved intermediate area. which taper and partially follow the circumference of the ribs 2 above. This measure makes it possible for the hot exhaust gas or gas flow flowing through the ribs 2 of the lower row 1 to be directed to the center of an upper pipe 1.
  • FIG. 8 shows a device which is used in vertically arranged boilers 3 and is designated overall by 10.
  • This device serves to hold the tubes 1 equipped with ribs 2 and the corresponding guide plates 5 in the interior of the boiler 3.
  • a plate 11 is provided in the lower part and in the upper part of the boiler 3 for receiving sheet metal stands 12, which are arranged parallel to one another and extend vertically at a predetermined distance.
  • Each stand 12 has cutouts 13 into which Holding strips 14 can be used. After the stand 12 has been fastened in the interior of the boiler, a strip 14 is inserted into the cutouts forming a lower, horizontal row and the associated finned tubes 1 are placed on this strip 14.
  • the guide plates 5 are then installed, which are held by the strip 14 which is subsequently introduced into a second row of cutouts 13. A further row of tubes 1 is then placed on and the assembly steps described so far are repeated (see also FIG. 5).
  • the flow guide plates proposed by the invention can also be provided for horizontally arranged waste heat boilers with natural flue gas circulation. In this case, the finned tubes must be arranged vertically and the exhaust gases flow in a horizontal direction.
  • a boiler equipped with the means proposed by the invention is improved in such a way that a new type of boiler is created, the efficiency of which is considerably increased by better thermal utilization of the heat contained in the hot gases and exhaust gases which flow through the tube groups .
  • the results of the tests carried out have shown that it is possible with a boiler which has the features according to the invention and whose dimensions are comparable to those of a boiler belonging to the prior art, improve the boiler efficiency by approximately 300%.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Paper (AREA)
EP97102155A 1996-02-16 1997-02-11 Chaudière de récupération avec des tubes à ailettes Withdrawn EP0790460A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT96MI000303A IT1282643B1 (it) 1996-02-16 1996-02-16 Caldaia a recupero munita di tubi alettati
ITMI960303 1996-02-16

Publications (2)

Publication Number Publication Date
EP0790460A2 true EP0790460A2 (fr) 1997-08-20
EP0790460A3 EP0790460A3 (fr) 2000-03-08

Family

ID=11373307

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97102155A Withdrawn EP0790460A3 (fr) 1996-02-16 1997-02-11 Chaudière de récupération avec des tubes à ailettes

Country Status (2)

Country Link
EP (1) EP0790460A3 (fr)
IT (1) IT1282643B1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1020708C2 (nl) * 2002-05-29 2003-12-02 Andries Meuzelaar Inrichting voor het overdragen van warmte.
WO2007087778A1 (fr) * 2006-01-31 2007-08-09 Bruendermann Georg Procede de dimensionnement optimal des tubes de transfert de chaleur dans des chaudieres de surchauffe
WO2007097856A2 (fr) * 2006-02-16 2007-08-30 Nooter/Eriksen, Inc. Echangeur de chaleur et tube a ailettes pour celui-ci

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR748639A (fr) * 1932-03-26 1933-07-06 Dispositif pour stabiliser la vitesse de l'air dans les batteries de chauffe
US3421482A (en) * 1967-01-19 1969-01-14 Anthony Pools Inc Outdoor swimming pool heater
DE1940963A1 (de) * 1969-08-12 1971-02-25 Maschf Augsburg Nuernberg Ag Waermetauscher aus quer angestroemten Rippenrohren
EP0225929A1 (fr) * 1985-12-10 1987-06-24 Rendamax B.V. Installation et utilisation de chaudières chauffées par gaz
US4957160A (en) * 1989-12-04 1990-09-18 Gas Research Institute Self-clamping baffle for tubular structures
US5163508A (en) * 1991-12-16 1992-11-17 Teledyne Industries, Inc. Heat exchanger baffle system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR748639A (fr) * 1932-03-26 1933-07-06 Dispositif pour stabiliser la vitesse de l'air dans les batteries de chauffe
US3421482A (en) * 1967-01-19 1969-01-14 Anthony Pools Inc Outdoor swimming pool heater
DE1940963A1 (de) * 1969-08-12 1971-02-25 Maschf Augsburg Nuernberg Ag Waermetauscher aus quer angestroemten Rippenrohren
EP0225929A1 (fr) * 1985-12-10 1987-06-24 Rendamax B.V. Installation et utilisation de chaudières chauffées par gaz
US4957160A (en) * 1989-12-04 1990-09-18 Gas Research Institute Self-clamping baffle for tubular structures
US5163508A (en) * 1991-12-16 1992-11-17 Teledyne Industries, Inc. Heat exchanger baffle system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1020708C2 (nl) * 2002-05-29 2003-12-02 Andries Meuzelaar Inrichting voor het overdragen van warmte.
WO2003100339A1 (fr) * 2002-05-29 2003-12-04 Andries Meuzelaar Echangeur thermique
CN100402967C (zh) * 2002-05-29 2008-07-16 安德烈斯·穆泽拉尔 热交换器、机动车、以及应用和制造该热交换器的方法
WO2007087778A1 (fr) * 2006-01-31 2007-08-09 Bruendermann Georg Procede de dimensionnement optimal des tubes de transfert de chaleur dans des chaudieres de surchauffe
WO2007097856A2 (fr) * 2006-02-16 2007-08-30 Nooter/Eriksen, Inc. Echangeur de chaleur et tube a ailettes pour celui-ci
WO2007097856A3 (fr) * 2006-02-16 2007-10-18 Nooter Eriksen Inc Echangeur de chaleur et tube a ailettes pour celui-ci

Also Published As

Publication number Publication date
IT1282643B1 (it) 1998-03-31
EP0790460A3 (fr) 2000-03-08
ITMI960303A0 (fr) 1996-02-16
ITMI960303A1 (it) 1997-08-16

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