EP0831280A2 - Kessel - Google Patents

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Publication number
EP0831280A2
EP0831280A2 EP97200361A EP97200361A EP0831280A2 EP 0831280 A2 EP0831280 A2 EP 0831280A2 EP 97200361 A EP97200361 A EP 97200361A EP 97200361 A EP97200361 A EP 97200361A EP 0831280 A2 EP0831280 A2 EP 0831280A2
Authority
EP
European Patent Office
Prior art keywords
reservoir
water
duct
interspace
guard
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.)
Ceased
Application number
EP97200361A
Other languages
English (en)
French (fr)
Other versions
EP0831280A3 (de
Inventor
Johannes Albertus Hendrikus Willemsen
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.)
Heatex BV
Original Assignee
METAAL VRIES BV
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 METAAL VRIES BV filed Critical METAAL VRIES BV
Publication of EP0831280A2 publication Critical patent/EP0831280A2/de
Publication of EP0831280A3 publication Critical patent/EP0831280A3/de
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/18—Water-storage heaters
    • F24H1/20—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes
    • F24H1/205—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes with furnace tubes

Definitions

  • This invention relates to a boiler according to the introductory portion of claim 1.
  • the object of the invention is to provide a boiler in which lime precipitation on the heating element and chip-off of lime fragments off the heating element do not occur or at any rate occur to a substantially lesser extent.
  • the guard provided with passages constitutes a guide which guides water along the heating element and thus causes an intensive, cooling flow along the external surface of the heating element, so that the above-described boiling phenomena and lime deposits on the heating element are prevented.
  • the boiler according to the example shown in Figs. 1 and 2 has a reservoir 1 with an interior space 2 for storing water.
  • the boiler comprises a furnace 3 with a burner 4 and a furnace wall 5 which constitutes a boundary between a burner chamber 6, containing the burner 4, and the interior 2 of the reservoir 1.
  • a flue duct 7 for discharging flue gases in a direction indicated with an arrow 8.
  • the flue duct 7 follows a helical line through the reservoir, in order to operatively promote heat transfer from the flue gases to the water in the reservoir 1.
  • ducts for supplying fuel and ambient air are also connected to the burner, but these are not shown in the drawings for the sake of simplicity.
  • a supply duct 9 for supplying water to be heated in a direction indicated with an arrow 10, which supply duct 9 includes a pump 11.
  • a guard 12 which screens the furnace 3 at a slight distance therefrom and defines a space 13 between the guard 12 and the furnace wall 5.
  • the guard 12 is provided with passages 14, 15 for letting water into and out of the interspace 13.
  • a number of the passages 14 are distributed over the guard. Via these distributed passages 14 the interspace 13 communicates directly with the rest of the interior 2 of the reservoir 1.
  • the cooling effect of the water flowing through the interspace 13 is distributed particularly uniformly in that the distributed passages 14 constitute inlets for admitting water to the interspace 13 and another, central passage 15 constitutes a discharge for discharging water from the interspace 13.
  • the highly uniformly distributed cooling action is here obtained in that, while the burner 4 burns, the temperature difference between the water in the interspace 13 and the furnace wall 5 is smallest in the area adjacent the central discharge passage 15, where the flow in the interspace 13 is concentrated most strongly.
  • the shell-like interspace 13 has a greater layer thickness in the area of the central passage 15 than in its more peripherally located areas. As a result, the rate of flow of the water is limited in the more centrally located area adjacent the central passage, which is advantageous for obtaining a uniformly distributed cooling action of the water flow in the interspace 13.
  • the furnace wall 5 has a concave outer side 16, opposite which the central discharge passage 15 is located.
  • the central discharge passage 15 is moreover located opposite the concave outer side 16 in spaced relation from the edges of the concave outer side 16.
  • the furnace wall 5 at a given material choice and wall thickness, is better resistant to excess pressure in the interior space 2 of the reservoir 1.
  • the furnace wall 5 can better accommodate to local differences in thermal expansion and shrinkage. It is noted that a furnace wall with one or more concave sides for the purpose of obtaining an improved pressure resistance and a reduction of thermal stresses can also be used with advantage in boilers which are not provided with a guard for guiding water to be heated along the furnace wall.
  • a tapping duct 17 for tapping water from the reservoir 1 in a direction indicated with arrows 18.
  • the water displacements generated during the tapping of water are also utilized for causing water to be heated to flow through the interspace 13.
  • the helical path of the flue duct 7 also contributes to the heat transfer for heating up water in the reservoir 1 before it is passed along the furnace wall 5.
  • the short-circuit duct 20 communicates at its end remote from the tapping duct 17, via a part of the supply duct 9, with the interior 2 of the reservoir 1. Via this short-circuit duct 20, when no water is being tapped, water that has passed through the interspace 13 can be recirculated to the interior 2 of the reservoir 1.
  • the pump 11 can be used both for tapping and supplying water and for recirculating water.
  • water is passed back to the reservoir, in so far as the flow rate through the pump is greater than the tapping flow rate downstream of the short-circuit duct 20.
  • the furnace 3 can be arranged in a bottom portion of the reservoir 1 and the pump 21 can be designed for pumping water from the interior 2 of the reservoir 1, via the central passage 15 into the interspace 13 between the guard 12 and the furnace wall 5.
  • the supplied water then leaves the interspace 13 again via distributed passages 14, so that a flow is obtained which is uniformly distributed over the interspace 13.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Air Supply (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
EP97200361A 1996-09-20 1997-02-10 Kessel Ceased EP0831280A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1004086A NL1004086C1 (nl) 1996-09-20 1996-09-20 Boiler.
NL1004086 1996-09-20

Publications (2)

Publication Number Publication Date
EP0831280A2 true EP0831280A2 (de) 1998-03-25
EP0831280A3 EP0831280A3 (de) 1999-04-21

Family

ID=19763547

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97200361A Ceased EP0831280A3 (de) 1996-09-20 1997-02-10 Kessel

Country Status (3)

Country Link
EP (1) EP0831280A3 (de)
DE (1) DE29619354U1 (de)
NL (1) NL1004086C1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1014303C2 (nl) * 2000-02-07 2001-08-08 Heatex Bv Boiler.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE486936C (de) * 1926-12-15 1929-11-27 Jules Louis Breton Warmwasserspeicher
CH145829A (fr) * 1929-07-02 1931-03-15 Mutrux Marcel Récipient à eau chaude à accumulation.
FR58782E (fr) * 1948-10-25 1954-04-05 Générateur d'eau chaude à gaz
EP0319009A2 (de) * 1987-12-04 1989-06-07 Friedrich Müller Warmwasserspeicher
US5357907A (en) * 1993-12-14 1994-10-25 Sabh (U.S.) Water Heater Group, Inc. Water heater with reduced localized overheating
WO1995016169A1 (en) * 1993-12-06 1995-06-15 Arild Hardeng Boiler with storage

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE486936C (de) * 1926-12-15 1929-11-27 Jules Louis Breton Warmwasserspeicher
CH145829A (fr) * 1929-07-02 1931-03-15 Mutrux Marcel Récipient à eau chaude à accumulation.
FR58782E (fr) * 1948-10-25 1954-04-05 Générateur d'eau chaude à gaz
EP0319009A2 (de) * 1987-12-04 1989-06-07 Friedrich Müller Warmwasserspeicher
WO1995016169A1 (en) * 1993-12-06 1995-06-15 Arild Hardeng Boiler with storage
US5357907A (en) * 1993-12-14 1994-10-25 Sabh (U.S.) Water Heater Group, Inc. Water heater with reduced localized overheating

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1014303C2 (nl) * 2000-02-07 2001-08-08 Heatex Bv Boiler.

Also Published As

Publication number Publication date
DE29619354U1 (de) 1997-03-27
EP0831280A3 (de) 1999-04-21
NL1004086C1 (nl) 1996-11-29

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