EP2009354A1 - Horizontal structure in a boiler - Google Patents

Horizontal structure in a boiler Download PDF

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Publication number
EP2009354A1
EP2009354A1 EP08075573A EP08075573A EP2009354A1 EP 2009354 A1 EP2009354 A1 EP 2009354A1 EP 08075573 A EP08075573 A EP 08075573A EP 08075573 A EP08075573 A EP 08075573A EP 2009354 A1 EP2009354 A1 EP 2009354A1
Authority
EP
European Patent Office
Prior art keywords
horizontal
boiler
membrane wall
membrane
walls
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Withdrawn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
EP08075573A
Other languages
German (de)
English (en)
French (fr)
Inventor
Johannes Hermanus Jacobs
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.)
Tetra Tube BV
Original Assignee
Tetra Tube 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 Tetra Tube BV filed Critical Tetra Tube BV
Publication of EP2009354A1 publication Critical patent/EP2009354A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M9/00—Baffles or deflectors for air or combustion products; Flame shields
    • F23M9/10—Baffles or deflectors formed as tubes, e.g. in water-tube boilers

Definitions

  • the invention relates to a horizontal structure in a boiler of for instance an incinerator, which boiler comprises at least two mutually opposite membrane walls, wherein each membrane wall comprises a large number of pipes through which cooling agent flows. Flowing between these two walls are hot flue gases which relinquish heat to the membrane walls, whereby the cooling agent is heated.
  • incinerator of for instance a waste treatment plant it is important to properly control the combustion process in order to reduce the emission of harmful substances.
  • additional air is usually blown in from the top to still enable afterburning of plumes of unburned carbon monoxide. It is important here that the blown-in air is mixed properly with the flue gases in order to obtain an optimal mixing.
  • At least one pipe of each of the mutually opposite membrane walls is bent out substantially horizontally and extends to the respective opposite membrane wall, and then continues in vertical direction in the respective opposite membrane wall.
  • a part of at least one pipe of the vertical membrane wall is bent out of the plane of the vertical membrane wall, although a part subsequently runs parallel thereto and is then bent out horizontally.
  • a number of adjacent pipes are bent out in order to form the horizontal membrane wall in the boiler.
  • a platform can be formed in the boiler, which for instance disrupts the flue gas flow and thereby causes eddies which improve the mixing of the flue gases.
  • the formed horizontal membrane wall has a roof-like cross-section.
  • the accumulation of fly ash on top of the horizontal membrane wall will hereby be reduced.
  • the construction moreover becomes more rigid due to the roof shape.
  • the horizontal membrane wall is constructed from a number of parallel pipes, a roof-like cross-section can be readily created by varying the vertical position of the horizontal pipe parts.
  • the invention further relates to a boiler of for instance an incinerator, which boiler has a substantially rectangular cross-section and comprises two pairs of mutually opposite membrane walls, wherein each membrane wall comprises a large number of pipes through which cooling agent flows, wherein at least one horizontal structure according to the invention is formed between at least one pair of mutually opposite membrane walls.
  • An improved mixing is hereby realized due to an abrupt, forced deflection of the gases for mixing. Due to the abrupt change in direction of the gases the mixing action under the horizontal structure is much greater than in the case of a usual, gradual constriction. In addition, the horizontal structure causes the phenomenon 'vena contracta' to occur, whereby the gas flow contracts even further, an intensified difference in speed occurs, and an excellent mixing of gases occurs due to these differences.
  • a preferred embodiment of the invention comprises two first horizontal structures which each form a horizontal membrane wall and which each lie against a membrane wall of the other pair of membrane walls such that a constriction is formed in the boiler.
  • a further embodiment of the invention comprises a number of pipes which are bent horizontally out of a membrane wall and which run back again into the same membrane wall and are placed between the two horizontal membrane walls such that the boiler is constricted in two horizontal, orthogonal directions.
  • a structure is for instance known from NL-A-1022586 .
  • the substantially rectangular boiler is hereby constricted in both horizontal directions similar to a diaphragm, and this further intensifies the eddies in the flue gasses and improves the mixing.
  • Another embodiment of the invention further comprises two second horizontal structures which each form a horizontal membrane wall and which each lie against a membrane wall of the other pair of membrane walls and are arranged immediately above the first horizontal structures such that the boiler is constricted in two horizontal, orthogonal directions.
  • this construction there is a partial overlap of the horizontal membrane walls. A constriction similar to a diaphragm is here also obtained in the boiler.
  • Figure 1 shows an incinerator 1 with a combustion chamber 2 and a boiler 3 arranged thereabove.
  • combustion chamber 2 Arranged in combustion chamber 2 is a grate 4 on which fuel 5 is arranged. Air is supplied below grate 4 in order to enhance the combustion of fuel 5.
  • nozzles 6 Arranged on the upper side of combustion space 2 are nozzles 6 which blow in secondary air in order to provide flue gases G with additional air and thereby enable an afterburning of gases contained therein.
  • boiler 3 Further arranged in boiler 3 is a horizontal structure 7 which forms a diaphragm in boiler 3. Because horizontal structure 7 forms a constriction and is moreover flat, flue gases G are forced through opening 8, whereby considerable turbulence is created in flue gases G.
  • FIG. 2 shows horizontal structure 7 in more detail.
  • the walls of boiler 3 are formed by pipes 9 through which a cooling agent flows. Pipes 9 are alternately bent out horizontally into a horizontal part 10 which runs to the opposite wall and is there taken up into the wall. A horizontal structure is thus created through which cooling agent moreover flows and which therefore has an acceptable lifespan.
  • elements 11 bent out of the wall are arranged between the two horizontal membrane wall parts 10. These elements 11 bent out of the wall are pipes 9 which are partially bent out horizontally and then run back again to the same wall.
  • Such as structure is already known from the prior art, i.e. NL-1022586 .
  • FIG 3 shows a variant 12 wherein horizontal membrane wall parts 13,14 are arranged between each pair of mutually opposite walls. Membrane walls 14 here lie immediately above membrane wall parts 13, thereby creating a constriction 15.
  • Figure 4 shows a third embodiment 16 of a horizontal structure according to the invention. This horizontal structure 16 is shown in perspective view in figure 5 .
  • Pipes 17 bent out of the vertical membrane wall are offset in vertical position relative to each other so that a roof shape is created in cross-section.
  • These horizontal structures 16 lie against walls 18 of the boiler, whereby a constricted opening 19 is created in the centre.
  • the flue gases are forced to pass through constriction 19, whereby a turbulence occurs.
  • the roof shape provides the advantage that less fly ash can accumulate on top of horizontal structure 16, and a more rigid structure is provided.
  • Figure 6 shows a part of the horizontal structure according to figure 2 . It is apparent herefrom that vertical pipes 9, which form part of the membrane walls of the boiler, are bent out horizontally into a horizontal part 10 and cross over to the opposite wall. The pipes are bent alternately out of the membrane wall. The other pipe 19 remains in the vertical membrane wall.
  • Figure 7 shows a fourth embodiment 20 of a horizontal structure according to the invention.
  • a vertical pipe 21 is bent out of the plane of the wall, after which a part 22 continues parallel to this wall.
  • a part 23 is then bent out horizontally and runs to the opposite wall, where it is taken up into the relevant wall.
  • Pipes 24 which are not bent out do not need to be modified in this construction, since the parallel part 22 of bent-out pipe 21 makes it possible to position the horizontal parts such that vertical pipes 24 can continue without modification.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
EP08075573A 2007-06-27 2008-06-24 Horizontal structure in a boiler Withdrawn EP2009354A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL1034043A NL1034043C2 (nl) 2007-06-27 2007-06-27 Horizontale structuur in een ketel.

Publications (1)

Publication Number Publication Date
EP2009354A1 true EP2009354A1 (en) 2008-12-31

Family

ID=38928554

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08075573A Withdrawn EP2009354A1 (en) 2007-06-27 2008-06-24 Horizontal structure in a boiler

Country Status (2)

Country Link
EP (1) EP2009354A1 (nl)
NL (1) NL1034043C2 (nl)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE662966C (de) * 1934-08-03 1938-07-26 Siemens Schuckertwerke Akt Ges Zwangsstromroehrendampferzeuger
DE739319C (de) * 1941-06-14 1943-09-20 Babcock & Wilcox Dampfkessel W Wasserrohr-Strahlungsdampferzeuger
DE1003906B (de) * 1954-03-27 1957-03-07 Duerrwerke Ag Stroemungsgitter fuer Strahlungskammern von Dampferzeugern
US3060909A (en) * 1959-05-30 1962-10-30 Sulzer Ag Support means for tubes or groups of tubes heated by hot gas
DE1901561A1 (de) * 1969-01-14 1970-08-13 Steinmueller Gmbh L & C Rohrwand fuer Dampf- bzw.Heisswassererzeuger
FR2150438A1 (nl) * 1971-08-25 1973-04-06 Waagner Biro Ag
NL1022586C2 (nl) 2003-02-05 2004-08-06 Nem Energy Services B V Ketelwanddeel met uitstekend element.
EP1607680A1 (en) * 2004-06-17 2005-12-21 General Electric Company Furnace with injection of overfire air

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE662966C (de) * 1934-08-03 1938-07-26 Siemens Schuckertwerke Akt Ges Zwangsstromroehrendampferzeuger
DE739319C (de) * 1941-06-14 1943-09-20 Babcock & Wilcox Dampfkessel W Wasserrohr-Strahlungsdampferzeuger
DE1003906B (de) * 1954-03-27 1957-03-07 Duerrwerke Ag Stroemungsgitter fuer Strahlungskammern von Dampferzeugern
US3060909A (en) * 1959-05-30 1962-10-30 Sulzer Ag Support means for tubes or groups of tubes heated by hot gas
DE1901561A1 (de) * 1969-01-14 1970-08-13 Steinmueller Gmbh L & C Rohrwand fuer Dampf- bzw.Heisswassererzeuger
FR2150438A1 (nl) * 1971-08-25 1973-04-06 Waagner Biro Ag
NL1022586C2 (nl) 2003-02-05 2004-08-06 Nem Energy Services B V Ketelwanddeel met uitstekend element.
EP1607680A1 (en) * 2004-06-17 2005-12-21 General Electric Company Furnace with injection of overfire air

Also Published As

Publication number Publication date
NL1034043C2 (nl) 2008-12-30

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