EP0126920A1 - Procédé d'injection d'air secondaire; entrée d'air secondaire pour la réalisation du procédé et application du procédé - Google Patents

Procédé d'injection d'air secondaire; entrée d'air secondaire pour la réalisation du procédé et application du procédé Download PDF

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Publication number
EP0126920A1
EP0126920A1 EP84103941A EP84103941A EP0126920A1 EP 0126920 A1 EP0126920 A1 EP 0126920A1 EP 84103941 A EP84103941 A EP 84103941A EP 84103941 A EP84103941 A EP 84103941A EP 0126920 A1 EP0126920 A1 EP 0126920A1
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EP
European Patent Office
Prior art keywords
secondary air
wall
end section
outlet
combustion
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Withdrawn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
EP84103941A
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German (de)
English (en)
Inventor
Theodor Koch
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.)
Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0126920A1 publication Critical patent/EP0126920A1/fr
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel 
    • F23L9/02—Passages or apertures for delivering secondary air for completing combustion of fuel  by discharging the air above the fire

Definitions

  • the present invention relates to a method for supplying secondary air to a section of a combustion chamber with a combustion zone, in which secondary air is supplied to the room at the periphery of the part, a secondary air inlet for carrying out the method, and use of the method in a waste incineration plant.
  • the aim of the present invention is to develop a method of the type mentioned at the outset in such a way that optimum flue gas combustion takes place with minimal impairment of the combustion chamber walls.
  • the supply with a larger axial direction component is made closer to the combustion zone than the supply in another direction.
  • the supply with a larger axial direction component be selected at least almost perpendicular to the floor section, which practically places a cylinder-like secondary air jacket between the combustion gases and the combustion chamber walls .
  • This is independent of a possible axial taper of the combustion chamber.
  • the supply with a larger axial direction component is selected at least almost parallel to the circumferential line direction of the periphery, whereby the secondary air jacket mentioned is generated directly in the wall area, in particular in the case of conical room walls.
  • a secondary air inlet for carrying out the method is characterized by an airflow distribution arrangement. It preferably comprises a feed channel and at least one preferably plate-shaped divider which projects the channel in a non-distributive manner, at least one channel wall end section, preferably plate-shaped with a divider end section, forming an outlet in one direction and the divider end section forming part of an outlet in the other direction.
  • This design of the secondary air inlet enables a simple structure that can be optimally combined with combustion chamber walls, the design in a preferred manner with a plate-shaped divider and a plate-shaped duct wall end section also enabling optimal secondary air distribution in the radial direction of the combustion chamber.
  • the airflow distribution arrangement can also be implemented by a plurality of appropriately directed, conventional nozzles.
  • At least one duct wall end section is preferably bent, as is the divider end section, with the duct wall end section being bent less with respect to a longitudinal duct axis, and the divider end section being bent more so that the latter with the duct wall end section has an exit with respect to this axis which is smaller and with one another wall part defines an outlet with a larger directional angle in this regard.
  • This will divide and in particular, its end part is used as part of the exits for both directions; one emerges between the divider end section and the duct wall end section, the second between the divider end section and possibly a further duct wall end section or directly the combustion chamber wall.
  • a passage opening be provided in the bending region of the duct wall end section, enclosing a smaller angle with respect to the duct axis than the duct wall end section.
  • the air flowing out between the divider and the end of the duct wall is again divided by the end of the duct wall now also acting as a divider and flows out in a third direction.
  • an air distribution arrangement which comprises a supply duct, at least one part of the duct wall being double-walled in its outlet area, with a through-opening or at most an outlet opening for the secondary air being provided in the inner wall, and possibly the outer wall.
  • An opening in the inner wall enables air to escape from the interior of the duct into the space between the ducts and thus a corresponding direction of the airflow components, the additional opening provided in the outer duct wall, if any, ensuring that the secondary air escapes in the third direction.
  • the division ratio is preferably set by variable positioning of at least one divider in a feed channel, for example by using spacers of different dimensions for the divider.
  • Fig. 1 is a partial view of a cross section of a combustion chamber 1 is shown, in the lower part, the combustion zone 3, a grate 5 is provided for receiving a combustible material, such as waste 7.
  • a secondary air supply channel 11 is provided in a radially projecting manner, which projects through the wall 9 and to which, for example, a ceramic felt layer 13 adjoins upwards.
  • the channel 11 opens into a combustion chamber section 15 located on the exhaust side with respect to the actual combustion zone 3.
  • An upper boundary plate 17 of the secondary air supply channel 11, preferably made of chromium-nickel steel, is bent toward the combustion zone 3.
  • the secondary air supply duct 11 is further subdivided by a divider plate 19 into an upper duct 21a and a lower one 21b, the divider plate 19 being bent practically at a right angle at the level of the duct mouth into the combustion chamber, but at a distance from the wall 9 along the latter protrudes below.
  • the secondary air supply duct 11 is delimited by the wall 9, for example covered with a cover plate 23.
  • the divider plate 19 is fixed thereon by means of spacer brackets 25, a further spacer bracket 27 supporting it against the upper channel boundary plate 17.
  • the latter In the bending zone of the upper duct plate 17, the latter has an outlet opening 29.
  • the air flow supplied through the secondary air supply duct 11 becomes at the divider plate 19 in the upper 21a and lower 21b duct divided, depending on the dimensioning of the spacers 25 and 27, which is selected according to the requirements.
  • the air flow in the lower duct 21b sweeps downward along the wall 9 against the combustion zone 3 and thus, as indicated at 31, causes the rising smoke gases to be centered around a combustion chamber axis indicated at A.
  • several of the secondary air inlets shown are provided radially, at the same height around the combustion chamber 1, in order to generate a symmetrical, uniform core zone of the gases 31.
  • the wall 9 in the area between combustion zone 3 and section 15 of the combustion chamber with the secondary air inlets is designed as a double wall.
  • the secondary air is led into a wall space 33 at the level of the combustion zone 3, there sweeps upwards along the inner wall 9a and the outer wall 9b, both preferably covered with steel plates 23a, 23b, to the already described secondary air inlet projecting radially against the combustion chamber 1.
  • the side of the inner wall 9a delimiting the intermediate space 33 is preferably provided with ribs 35 which enlarge the surface. In this arrangement, the effect of Intermediate space 33 with the ribs 35 ensures optimal cooling of the inner wall part 9a facing the combustion chamber 1.
  • the supplied secondary air is preheated at the level of the combustion zone 3, so that it emerges preheated from the channels 29, 21a and 21b, which in turn has a favorable effect on the flue gas combustion.
  • the secondary air inlet according to the invention, here designated as a whole by 37.
  • the secondary air is first led through the building wall 39 through a supply line 41 in the area of the secondary air inlet 37.
  • the line 41 then opens into an air supply and insulation chamber 43 running down the wall 39, which in the region of the combustion zone 3 opens radially inwards into an inner chamber 45 leading upwards and finally opening into the secondary air inlet 37.
  • the wall separating the inner chamber 45 from the combustion chamber 1 preferably consists of a ceramic material and is covered with a steel plate 47 on the side facing the chamber 45.
  • surface-increasing longitudinal ribs 35 are also provided here.
  • the partition between the insulation chamber 43 and the upwardly extending chamber 45 is formed by a steel plate 49, the side of the wall 39 delimiting the insulation chamber 43 also being provided with a steel cladding 51.
  • the air flow in this arrangement is again indicated by arrows.
  • This wall structure provides optimal insulation of the ver combustion chamber 1 against the wall, for example the building wall 39, the secondary air in turn being successively heated on its way through the chambers 43, 45 to the secondary air inlet 37.
  • a feed line 53 opens into a first chamber 55.
  • the chamber 55 opens towards the combustion chamber 1 into a further chamber 57, which extends along the chamber 55 upwards, then again radially to the part of the chamber 55 facing away from the combustion chamber 1, finally runs axially upwards again and there into the secondary air inlet 37 opens.
  • the structure of the chambers 55, 57 consists of steel plates and is supported on a foundation part 59 of the incineration plant, both chambers 55, 57 being dimensioned such that they also radially occupy the entire width of the combustion wall 9.
  • the boundary plate of the chamber 57 facing the combustion chamber simultaneously forms the inner combustion chamber wall area in its area and is provided with surface-increasing ribs 35 in the chamber 57.
  • the chambers 55, 57, as well as possibly a plurality of supply channels 11, the secondary air inlets 37 with the plates 17, 19 forming the outlet are expanded in the radial direction as required. This can be seen in particular from FIG. 6 to be described below.
  • FIG. 5 shows a further embodiment variant of a secondary air inlet into a combustion chamber 1, the wall 9 of which is provided with steam pipes 10 as a steam boiler wall.
  • a secondary air supply 59 passes between the steam pipes 10 and opens on the combustion chamber side into a radially more or less extensive supply duct 12.
  • the feed channel 12, formed from steel plates, runs, as mentioned, radially, ie parallel to the grate 5 along the wall 9, in particular its upper and lateral surface facing the combustion chamber 1 being protected with a ceramic covering 61.
  • the channel 12 On its side facing the combustion zone 3, the channel 12 has an outlet opening, which is preferably also radially more or less extensive, formed on the one hand by a channel wall end section 63 which is guided downwards at a distance parallel to the steam pipes 10, and on the other hand to form a first nozzle-shaped outlet 65 in Direction of the axes of the steam pipes 10, through a second, preferably thicker steel plate 67, forming the combustion chamber-side boundary of the outlet 65.
  • the plate 67 is angled in an L-shape, its shorter L-leg being fastened to the part of the duct 12 on the combustion zone side.
  • the plate 67 To form a second outlet 69, the plate 67 is directly in the area of its kink, respectively.
  • the combustion chamber-side plate 73 is bent towards the combustion chamber axis A in its combustion zone-facing end section, with the result that the outlet 69 has a reduced axial component in the direction of the combustion zone 3 with respect to the outlet 65.
  • the combustion chamber-side plate 73 is also L-shaped and rests with its one L-leg on the combustion zone-side wall of the channel 12, wherein it has an opening 75 in its kink area, connecting the outlet 69 to the combustion chamber 1 radially.
  • FIG. 6 schematically shows a longitudinal section through an incinerator provided with secondary air inlets according to the invention.
  • the combustion material 7 lies on a step-like grate 5, which can be pushed from an inlet zone 79 into an ejection zone 81 by means of a chute arrangement 77.
  • the combustion material for example garbage, is poured through an inlet pipe 83 and pushed to the first grate level with the stoker 77.
  • the fired material pre-burned on the first grate level 5 is conveyed by the grate movement in a known manner for further combustion to the next levels.
  • a plurality of secondary air inlets 37 are arranged in each case in the combustion chamber wall 9, parallel to the grate steps, designed as described with reference to FIGS. 1 to 4.
  • a second secondary air inlet row 87 is provided at each grate level above a first secondary air inlet row 85.
  • FIG. 7 which shows a cross section through the combustion chamber 1, it is entirely possible to provide secondary air inlets 37 according to the invention in a first cross-sectional plane with exit directions primarily directed axially towards the combustion zone 3, in an overlying cross-sectional plane with exit directions primarily directed in the exit direction .
  • Wall protection is thus achieved above the upper secondary air inlets 37, with the secondary air components directed upwards along the combustion chamber wall 9, and on the other hand further mixing and combustion in the ascending smoke gas core zone.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Incineration Of Waste (AREA)
EP84103941A 1983-05-20 1984-04-09 Procédé d'injection d'air secondaire; entrée d'air secondaire pour la réalisation du procédé et application du procédé Withdrawn EP0126920A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH276683A CH665468A5 (de) 1983-05-20 1983-05-20 Verfahren zur sekundaerluftzufuehrung, sekundaerlufteinlass zur ausfuehrung des verfahrens sowie anwendung des verfahrens.
CH2766/83 1983-05-20

Publications (1)

Publication Number Publication Date
EP0126920A1 true EP0126920A1 (fr) 1984-12-05

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ID=4241129

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84103941A Withdrawn EP0126920A1 (fr) 1983-05-20 1984-04-09 Procédé d'injection d'air secondaire; entrée d'air secondaire pour la réalisation du procédé et application du procédé

Country Status (2)

Country Link
EP (1) EP0126920A1 (fr)
CH (1) CH665468A5 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT390206B (de) * 1988-04-22 1990-04-10 Howorka Franz Einrichtung zum thermischen zerlegen von fluiden schadstoffen
EP0496094A2 (fr) * 1991-01-24 1992-07-29 MARTIN GmbH für Umwelt- und Energietechnik Ajutage pour amener l'air secondaire
WO2016119069A1 (fr) * 2015-01-30 2016-08-04 Mokesys Ag Dispositif d'amenée d'air pour un incinérateur

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE461295B (sv) * 1988-06-14 1990-01-29 Hultgren Karl S H Anordning foer foerbraenning av fasta braenslen, foersedd med i braennkammaren anordnade insatser foer styrning av tillfoerseln av foerbraenningsluft

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191223057A (en) * 1911-10-10 1913-04-03 Karl Schleyder Improvements in and relating to the Furnaces of Steam Generators and other Furnaces.
US1464299A (en) * 1921-02-03 1923-08-07 Swartz Henry Coal-gas carburetor
US1569811A (en) * 1924-12-12 1926-01-12 Jordan Ernest Air heater for furnaces
CH138546A (fr) * 1929-01-12 1930-03-15 Schroeder Charles Dispositif pour l'injection d'air chaud secondaire dans les foyers.
FR809562A (fr) * 1936-08-06 1937-03-06 Dispositif applicable aux chaudières à tubes d'eau
DE654851C (de) * 1935-05-15 1937-12-31 Alexandre Germeau In Feuerungen einzubauender kastenfoermiger Luftvorwaermer
DE3038875A1 (de) * 1980-10-15 1982-06-03 Vereinigte Kesselwerke AG, 4000 Düsseldorf Muellverbrennungsanlage

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191223057A (en) * 1911-10-10 1913-04-03 Karl Schleyder Improvements in and relating to the Furnaces of Steam Generators and other Furnaces.
US1464299A (en) * 1921-02-03 1923-08-07 Swartz Henry Coal-gas carburetor
US1569811A (en) * 1924-12-12 1926-01-12 Jordan Ernest Air heater for furnaces
CH138546A (fr) * 1929-01-12 1930-03-15 Schroeder Charles Dispositif pour l'injection d'air chaud secondaire dans les foyers.
DE654851C (de) * 1935-05-15 1937-12-31 Alexandre Germeau In Feuerungen einzubauender kastenfoermiger Luftvorwaermer
FR809562A (fr) * 1936-08-06 1937-03-06 Dispositif applicable aux chaudières à tubes d'eau
DE3038875A1 (de) * 1980-10-15 1982-06-03 Vereinigte Kesselwerke AG, 4000 Düsseldorf Muellverbrennungsanlage

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT390206B (de) * 1988-04-22 1990-04-10 Howorka Franz Einrichtung zum thermischen zerlegen von fluiden schadstoffen
EP0496094A2 (fr) * 1991-01-24 1992-07-29 MARTIN GmbH für Umwelt- und Energietechnik Ajutage pour amener l'air secondaire
EP0496094A3 (en) * 1991-01-24 1992-12-23 Martin Gmbh Fuer Umwelt- Und Energietechnik Method and nozzle for feeding secondary air
WO2016119069A1 (fr) * 2015-01-30 2016-08-04 Mokesys Ag Dispositif d'amenée d'air pour un incinérateur
CH710683A1 (de) * 2015-01-30 2016-08-15 Mokesys Ag Vorrichtung zur Einspeisung von Luft in den Feuerraum eines Verbrennungsofens.

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Publication number Publication date
CH665468A5 (de) 1988-05-13

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