EP0118460A1 - Four - Google Patents

Four

Info

Publication number
EP0118460A1
EP0118460A1 EP19830902231 EP83902231A EP0118460A1 EP 0118460 A1 EP0118460 A1 EP 0118460A1 EP 19830902231 EP19830902231 EP 19830902231 EP 83902231 A EP83902231 A EP 83902231A EP 0118460 A1 EP0118460 A1 EP 0118460A1
Authority
EP
European Patent Office
Prior art keywords
combustion
boiler
fluidized bed
section
combustion chamber
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Withdrawn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
EP19830902231
Other languages
German (de)
English (en)
Inventor
Franz Koch
Wilhelm Bertalan
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.)
'comfort' Heiztechnik & Co Kg GmbH
Original Assignee
'comfort' Heiztechnik & Co Kg 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
Priority claimed from AT286982A external-priority patent/ATA286982A/de
Application filed by 'comfort' Heiztechnik & Co Kg GmbH filed Critical 'comfort' Heiztechnik & Co Kg GmbH
Publication of EP0118460A1 publication Critical patent/EP0118460A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/002—Fluidised bed combustion apparatus for pulverulent solid fuel

Definitions

  • the invention relates to a firing system for solid, in particular granulated fuels, preferably for household purposes, with a fuel supply device, with a firing boiler, in which a combustion chamber for a fluidized bed combustion is arranged, the combustion chamber of which is provided with a carrier plate for the fluidized bed, which is directed upwards into one Clearance and below the support plate merges into a combustion air supply chamber, the furnace having a metallic jacket which is surrounded by a heat insulation layer, with an exhaust gas outlet and preferably with a device for discharging the combustion residues from the furnace, which has a discharge line with a shut-off device.
  • fluidized bed combustion plants are so far only used in the industrial sector with an output of around 500 kW or more.
  • fluidized bed combustion in the 5 - 500 kW power range has a similar one for various reasons, despite the theoretical possibilities with such a combustion system To achieve comfort like with gas and oil firing, no entrance found.
  • a firing system of the type mentioned at the outset can be found, for example, in DE-A-2856870.
  • a furnace with a combustion chamber for the fluidized bed is surrounded by insulation, which delays the cooling of the fluidized bed after the system is switched off.
  • the fine coal used as fuel is supplied by means of a conveying stream which is supplied through a line opening in the middle of the carrier plate.
  • a heat exchanger for dissipating the heat generated is arranged above the fluidized bed in such a way that it does not, or only partially, submerge in the fluidized bed in the idle state, so that unnecessary heat dissipation is also avoided after the combustion system is switched off and the cooling of the fluidized bed is thus delayed again .
  • Screw conveyor in the lower. Area of the fluidized bed is introduced directly and bed material is also discharged from this area.
  • the combustion system is used in particular for the combustion of water-containing waste material or sludge, which is mixed with the hot bed material that has been drawn off before it is fed in, in order to dewater the fuel material. Insulation against excessive heat loss is not provided, since heat is deliberately removed from the boiler for the purpose described.
  • DE-A-2356487 describes a fluidized bed combustion in which the fuel is introduced through the inner tube of a lance into the fluidized bed with the aid of a conveying air flow, the conveying air being used simultaneously as combustion air. Through an outer tube of the lance, a further part of the combustion air is blown into the fluidized bed, which is used to cool the inner tube. Overall, a controlled flow rate of the fuel supply is achieved by a pressure, measuring and control device, which prevents cracking of the fuel in the inner tube.
  • the boiler jacket is divided into three sections which are insulated from one another against direct heat conduction, of which the lower one is assigned to the combustion air supply chamber, the middle one to the combustion chamber and the upper one to the free space.
  • the division of the firing boiler into non-contacting sections interrupts the direct heat conduction between the hottest section of the boiler jacket assigned to the combustion chamber and the two subsequent sections above and below.
  • the cooling process of the resting stratified bed is greatly delayed, so that the slower cooling from the preferred operating temperature of the fluidized bed with coal as fuel of around 850 ° C and the minimum temperature of around 600 ° C necessary for automatic restarting doubles or triples the switching intervals compared to the known combustion plants.
  • the initial heating-up time is greatly shortened by the supply of external energy, thereby saving energy.
  • the grooves are provided in the form of a ring, and the central boiler shell section has approximately the shape of a coil or drum with side flanges.
  • the height of the middle section of the boiler shell is chosen so that it encompasses the thickness of the fluidized bed in the idle state, or only slightly exceeds it, in order to avoid unnecessary heat radiation surfaces in the idle state of the fluidized bed and on the other hand to ensure that in the operating state when the fluidized bed is expanded direct heat transfer to the upper section of the boiler shell can take place.
  • the thermal insulation layer of the boiler shell is divided into three sections which are placed one on top of the other, the central insulation layer section projecting beyond the central boiler jacket section on both sides and the preferably provided grooves being formed in pairs in its two end regions.
  • the subdivision of the heat insulation layer enables maintenance and repairs of the firing system in a simple manner, since this enables access to the combustion chamber without any particular difficulties.
  • the middle insulation layer section is formed at least in two parts, the parting planes running vertically, the middle insulation layer section for cylindrical firing boilers can consist of two half-shells which can be pivoted relative to one another about a vertical axis. After both half-shells have been swung out, thereby releasing the bent end regions of the middle boiler shell section, the latter can be removed as a whole.
  • the fuel supply device extends into the combustion chamber in the upper boiler jacket section, and is at least inside, preferably also outside of the combustion chamber, surrounded by an essentially cylindrical cooling jacket which is sealed off from the combustion chamber and through which a coolant, for example water, flows, whereby A particularly advantageous embodiment is obtained when the fuel supply device extends to approximately the middle of the combustion chamber and the cooling jacket passes through the combustion chamber, with an ejection opening for the solid fuel approximately in the center thereof.
  • the particular advantage of this embodiment is that the cooling of the fuel supply device prevents the disadvantageous swelling of the fuel during transport and thus reduces or blocks the delivery.
  • the above-described version enables a particularly long service life, as well as the introduction of the solid fuel centrally into the combustion chamber, which is particularly important solid fuels that are difficult to control, where rapid mixing and precise allocation are required. In the performance range cited above, this is of fundamental importance for optimal combustion, taking into account the surface-mass ratio.
  • the fuel supply device with the cooling jacket is arranged in the lower end region of the upper boiler jacket section, and is at least partially, preferably entirely, embedded in the expansion zone of the fluidized bed.
  • the underside of the fuel supply device in order not to hinder the disassembly of the central part of the boiler, as described above, that is to say the removal or pivoting up of the central insulating layer section, the underside of the fuel supply device also lies above the central insulating layer section, which projects above the central boiler jacket section.
  • the cooling jacket In the idle state of the fluidized bed, the cooling jacket is not only not washed around by this, but also dissipates less heat from the boiler jacket, since it enters the combustion chamber in the upper boiler jacket section, which is thermally insulated from the central boiler jacket section. Accordingly, it can also be used in the operating state for the primary heat dissipation of the heating system from the fluidized bed.
  • the sensible combination of cooling the fuel supply device and heat removal from the fluidized bed with a coolant circuit results in a compact component, which is an essential prerequisite for the value for money and thus competitiveness of such a system.
  • the inlet of the cooling jacket for the coolant is arranged on one side of the combustion chamber and the outlet for the coolant is arranged on the opposite side of the combustion chamber.
  • the outlet of the coolant is preferably connected to a secondary heat exchanger of the heating system, which is preferably arranged above the free space in the flow path of the exhaust gases from the combustion system.
  • the cooling jacket and the secondary heat exchanger are preferably connected in series.
  • Solid fuels as is well known, have various levels of ash that are widely dispersed.
  • some of the combustion residues are discharged with the exhaust gases, but a small part of the combustion residues remain in the fluidized bed, which means that the volume of the fluidized bed increases continuously with increasing combustion time. This causes the pressure required to supply the combustion air to rise continuously.
  • the shut-off device of the discharge line for example a butterfly valve or a gate valve, can preferably be actuated by means of a pressure switch which is controlled by the pressure of the combustion air leading to the combustion chamber.
  • the pressure switch is connected with a pressure line to the combustion air supply chamber below the carrier plate of the fluidized bed.
  • the shut-off device With increasing combustion residues in the fluidized bed, the shut-off device is opened via the pressure switch by the pressure required for fluidization when a limit value dependent on the height of the expansion zone is exceeded. The discharge of the combustion residues is therefore controlled depending on the pressure behavior in the combustion chamber.
  • combustion residues can also be formed which have a slightly higher specific weight. These combustion residues are not washed to the surface in the expanded fluidized bed, but remain in the lower layers. If the proportion of these heavier combustion residues is above average, it can also be provided in one embodiment that a discharge line for discharging the combustion residues opens into the combustion chamber in the central boiler section immediately above the carrier plate of the fluidized bed, the shut-off element in the same way due to the increasing combustion air pressure is opened. It is of course possible to provide the discharge device with both discharge lines, so that the lighter, more often removed portions through the discharge line opening into the upper boiler shell section and through the discharge into the middle boiler shell the heavier, rarer parts to be removed. The discharge line for the heavier parts is provided so that it can be removed easily so as not to unduly hinder the expansion of the combustion chamber.
  • the carbon monoxide content of the flue gases in this operating state is 300 mg and their carbon content is 500 mg per kg of fuel.
  • the hot body leads to a reduction in the carbon monoxide content to 200 mg and the carbon content to 400 mg per kg of fuel due to the independent afterburning.
  • the radiation absorption capacity of the body should come as close as possible to a so-called "black body". It preferably has a surface enlarged through passage openings, for example by being formed by a plurality of tubes, plates or honeycombs. It can also consist of a porous, heat-storing, ceramic mass based on silicates, silica-aluminates and / or aluminates, such as chamotte, sillimanite, mullite and or or, preferably sintered, alumina (Al 2 O 3 ), or of magnesium and / or chromium oxide or a silicon carbide.
  • the effect of the body can of course be determined by a
  • Coating or impregnation with a catalytically active oxidic material in particular with at least one oxide of thorium and / or rare earths, preferably yttrium or cerium, and / or at least one mixed oxide of the metals mentioned with aluminum or chromium, which oxides can advantageously be mixed with at least one promoter metal, such as in particular Ag, Cu, Ru and / or Pd.
  • a catalytically active oxidic material in particular with at least one oxide of thorium and / or rare earths, preferably yttrium or cerium, and / or at least one mixed oxide of the metals mentioned with aluminum or chromium, which oxides can advantageously be mixed with at least one promoter metal, such as in particular Ag, Cu, Ru and / or Pd.
  • Particularly good combustion conditions can be achieved if in the upper boiler shell section assigned to the body and preferably also above the inner surface of the boiler shell section with catalytically active oxidic material, in particular with at least one oxide of thorium and / or rare earths, preferably yttrium or cerium, and or or at least one mixed oxide of the metals mentioned are coated and / or impregnated, preferably spray-coated, with aluminum and / or chromium, which oxides are preferably coated with at least one promoter metal, such as in particular Ag, Cu, Ru and or Pd.
  • catalytically active oxidic material in particular with at least one oxide of thorium and / or rare earths, preferably yttrium or cerium, and or or at least one mixed oxide of the metals mentioned are coated and / or impregnated, preferably spray-coated, with aluminum and / or chromium, which oxides are preferably coated with at least one promoter metal, such as in particular Ag, Cu, Ru
  • the catalytically active material is in particular a mixed oxide of thorium and / or the rare earths with aluminum and / or chromium, the content of thorium and / or rare earth oxides being 2-4% by weight, in particular 3 -12% by weight, preferably 5-10% by weight, in each case calculated as oxide, and the content of promoter metals preferably contained, such as in particular Ag, Cu, Ru and or or Pd 0.02-3% by weight, in particular 0.1-1.0% by weight, based on thorium and / or rare earth oxides.
  • the secondary heat exchanger of the heating system is arranged above the body in the afterburning zone of the carbon monoxide, that is to say in the area in which the greatest possible heat emission of the afterburning flue gases can be achieved.
  • FIG. 1 shows a schematic partial longitudinal section through a furnace according to the invention
  • FIG. 2 shows a longitudinal section like FIG. 1 through the first part of the combustion chamber
  • FIG. 3 shows a section along the line III-III in FIG. 2
  • 4 shows a section along the line IV-IV in FIG. 2nd
  • the firing system shown in the drawing and suitable for increasing the cost of solid fuels, in particular comminuted or granulated coal, has a fuel feed device 27 and a firing boiler 1 with a combustion chamber 2.
  • the combustion chamber 2 is divided into a combustion air supply chamber 6, a combustion chamber 3 arranged above it with a fluidized bed 19 and a free space 5 from which an exhaust pipe 42 leads away.
  • the fuel supply device conveys a screw conveyor 28, fuel from a storage container into the combustion chamber 2.
  • the combustion chamber 3 comprises a support plate 4, which is provided with numerous openings, the so-called nozzle plate, above which the fluidized bed 19 is supplied with air from the combustion air supply chamber 6 by means of a fan (not shown) is in limbo.
  • An electrical heater 44 for igniting the furnace is arranged below the carrier plate 4.
  • the expanded fluidized bed extends the free space 5, the height of which is preferably approximately 5 to 20 times the height of the fluidized bed 19 and through which the combustion chamber in the
  • a body 40 is arranged inside the free space 5, of the body 40 formed during the combustion process Gases and exhaust gases flow around or through.
  • the body 17 is held in place by a support structure 43 made of heat-resistant and scale-resistant material.
  • a wide variety of heat-resistant materials come into consideration as the material for the body 17. Preference is given to those which come close to the properties of a "black body", that is to say bodies made of dark, preferably “ceramic” materials in the broadest sense.
  • the preferred materials here are - but not completely - heat-resistant materials based on silicates, silicon aluminates, aluminates such as in particular chamotte, sillimanite, mullite, alumina (Al 2 O 3 ) or the like. called, but also magnesia stones, especially chrome magnesia stones, can be used.
  • the body 40 can also be made of pipes made of a scale-resistant, heat-resistant metal such as stainless steel, etc. The meaning of the body 40 is explained in more detail below.
  • a secondary heat exchanger 34 is provided in the system shown, through which the exhaust gases flow or flow, the heat of the exhaust gases being passed to a heating medium, e.g. Water or steam, or the like for a heating system. is given.
  • a heating medium e.g. Water or steam, or the like for a heating system.
  • the screw conveyor 28 which is driven by an electric motor, extends into the middle of the combustion chamber 2, wherein it is surrounded by a cooling jacket 29, which surrounds it beginning outside the boiler 1 and completely penetrates the combustion chamber 2.
  • the cooling jacket 29 is designed as a double-walled tube forms and is flowed through by cooling water, which is fed through an inlet 31 to the cooling jacket 29 and exits the cooling jacket 29 through an outlet 32 on the opposite side of the boiler 1.
  • the cooling jacket 29 has an ejection opening 30 approximately in the middle of the combustion chamber 2, through which the fuel supplied by the screw conveyor 28 enters the combustion chamber 2.
  • the cooling jacket 29 simultaneously forms a primary heat exchanger, the outlet 32 of which is connected via a line 33 directly to the secondary heat exchanger 34, so that both heat exchangers are connected in series.
  • the fluidized bed is formed from an inert, granular material, for example bauxite, quartz sand, or the ash of the fuel, it lies well on the carrier plate 4 without air throughput and the surface 20 of the fluidized bed 19 lies below the cooling jacket 29.
  • Air supplied from the combustion air supply chamber clas fluidized bed 19 expands up through the expansion zone 22 until the cooling jacket 29 is completely embedded in the fluidized bed.
  • the surface 21 of the expanded fluidized bed is therefore above the cooling jacket 29, which can dissipate combustion heat by direct heat conduction. If the combustion air is switched off, the fluidized bed collapses again, the surface 20 of the fluidized bed coming to rest below the cooling jacket, thus avoiding direct heat dissipation.
  • Fig. 2 shows the immediate combustion area of the boiler 1 in detail.
  • the metallic shell of the firing boiler 1 is composed of three sections 8, 9, 10 and is surrounded overall by a heat insulation layer 11. As shown, this is preferably also divided into three sections 12, 13, 14. Of the three boiler jacket sections, the lower 8 encloses the combustion air supply chamber 6, which receives the heater 44, the middle 9 the combustion chamber 3 and the upper 10 the free space 5.
  • the three boiler jacket sections 8, 9, 10 are spaced from one another, so that a direct heat conduction from the fluidized bed 19 receiving middle boiler shell section 9 is prevented in the other two sections 8,10.
  • the upper end region 17 of the middle boiler shell section 9 lies slightly above the surface 20 of the fluidized bed 19 in the idle state.
  • the heat insulation layer 11 has two pairs of grooves 15, in which seals 18 are preferably inserted. In each of these grooves 15, bevelled end regions 16, 17 of the boiler shell sections 8, 9, 10 engage.
  • the middle shell section 9 is therefore folded at both end regions 16, 17, the folds being inserted into a groove 15 of the two pairs of grooves.
  • the lower boiler shell section 8 is folded only in its upper end region 17, which lies in the lower groove 15 of the lower pair of grooves.
  • the upper shell section 10 is folded in its lower end region 16, which engages in the upper groove 15 of the upper pair of grooves.
  • the firing boiler 1 and the heat insulation layer 11 are in particular cylindrical, as shown in FIG. 3 shows in section. Since it will occasionally be cheap or necessary to subject the firing boiler 1, in particular the central boiler shell section 9 receiving the fluidized bed 19, to maintenance or cleaning, the heat insulation layer 11 can, as mentioned, also be divided into three sections 12, 13, 14 , with each section 12, 13, 14 essentially one.
  • the middle insulation layer section 13 projects beyond the middle boiler shell section 9 on both sides and is provided in each projecting end region 23, 24 with a pair of the grooves 15 which are spaced apart from one another. Furthermore, the middle insulation layer section 13 is formed in two parts, ie it consists of two pivotable about a vertical axis 16
  • Half shells 25 which are held together by connecting devices, not shown. After loosening the connection devices, at least one half-shell 25 can be opened, so that the central boiler shell section 9 with the support plate 4 is easily accessible. After removal of the central boiler jacket section 9, the heater 44 in the lower boiler jacket section 8 and the ejection opening 30 of the fuel supply device 27 are also accessible.
  • the upper end area 24 of the middle insulating layer section 13 ends below the cooling jacket 29 of the fuel supply device, ie the overlap of the upper end area 24 over the lower end area 16 of the upper boiler jacket section 10 is kept as low as possible .
  • the protrusion of the lower end region 23 of the middle insulating layer section 13 over the The middle shell section 9, however, can be chosen arbitrarily, and in order to achieve a better fit, stepped end faces can be seen between the two end regions 23, 24 in particular there.
  • FIG. 4 shows a longitudinal section through 90 through the lower part of the furnace 1. Details of a discharge device 35 for the combustion residues are shown here. With increasing burning time, the fluidized bed expands over the surface 21 due to an increasing ash content, for example with a larger proportion of heavy ash. Since this interferes with the optimal combustion conditions, the combustion residues are removed via at least one discharge line 36 which, in particular, as shown in solid lines in FIG. 4, opens into the combustion chamber in the lower end region 23 of the upper insulation layer section 14.
  • a shut-off device 37 e.g. a butterfly valve or a gate valve, which can be actuated by means of a pressure switch 38.
  • the pressure switch 38 can e.g. be a pressure-controlled solenoid valve and is connected via a pressure line 39 to the combustion air supply chamber 6 below the carrier plate 4 for the fluidized bed 19.
  • the pressure required to keep the fluidized bed 19 in suspension increases, ie the air pressure in the combustion air supply chamber 6 increases.
  • This increase in pressure is used to trigger the pressure switch 38 which, when configured as a solenoid valve, opens the shut-off device 37 via electrical lines 46, whereupon the ashes pass through the discharge line 36 runs into an ash collector 45.
  • the pressure switch 38 which, when configured as a solenoid valve, opens the shut-off device 37 via electrical lines 46, whereupon the ashes pass through the discharge line 36 runs into an ash collector 45.
  • the air pressure required to keep the fluidized bed 19 in suspension drops and the shut-off device 37 is closed again.
  • Discharge device 35 ' open directly above the carrier plate 4 into the combustion chamber 3, which also has a shut-off organ 37, and can be controlled by means of the same pressure switch 38.
  • the pressure switch 38 can also be designed in two stages, i.e. that the shut-off device 37 of the discharge device 35 'only opens at a higher pressure in the combustion air supply chamber 6, which occurs without exceeding the surface 21 of the expanded fluidized bed 19 due to a high proportion of heavy combustion residues not reaching the upper discharge device 35. These then also get into the ash collector 45.
  • the discharge device 35 ' can advantageously be easily dismantled in order not to make the opening of the middle insulation layer section 13 particularly difficult.
  • the fluidized bed 19 During operation of the furnace at temperatures of the fluidized bed 19 extends from about 750 ° -900 ° C. the fluidized bed 19 up to the surface 21 and encloses the cooling jacket 29, via which approximately half of the heat generated can be dissipated. There is direct contact with the upper boiler jacket section 10, which heats up in its entire height by direct heat conduction. When the furnace is switched off, the fluidized bed 19 sinks to the surface 20 and, as mentioned, emerges from the upper boiler jacket section 10. Due to the heat insulation layer 11, the spacing of the boiler shell sections 8,9,10 and. the exit of the cooling jacket 29 from the fluidized bed 19, the cooling time to that temperature of about 600 ° C, which is required for the automatic ignition of the fuel with new Licher fuel supply, is significantly extended.
  • the above-mentioned body 40 inserted in the upper region of the free space 5 leads to better utilization of the exhaust gas heat. Its radiation absorption capacity, which is as high as possible, allows the body 40 to reach a temperature of approximately 50 ° C. below that of the fluidized bed 19, so that it lies between 700 ° and 850 ° C.
  • the immediate surrounding or surface area 40 therefore has at least that temperature of 700 ° C. at which the automatic combustion of carbon monoxide to carbon dioxide, that is to say without catalytic measures, begins.
  • the waiter Secondary heat exchanger 34 (FIG. 1) arranged half of the body 40 is therefore flowed through by much hotter, since newly heated, exhaust gases, so that an increased heat exchange can take place in this afterburning zone 41. After all, one delivers m 3
  • Carbon monoxide when burned to carbon dioxide has an amount of heat of about 12.7 kJ.
  • the carbon monoxide content of the flue gases can be reduced by about 1/3.
  • a reduction in the carbon monoxide content of the flue gases escaping through the exhaust gas line 42 can be achieved if the body 40 and also the wall parts of the upper boiler shell section 10 surrounding the installation area of the body 40 and the afterburning zone 41 are provided with a catalytic coating or impregnation.
  • the effectiveness that can be achieved with a combustion plant designed according to the invention in the completion of the combustion of the gases and / or exhaust gases from the fluidized bed combustion is demonstrated using the following example:
  • Solid fuels in comminuted and / or compressed form are all coal, peat, wood pellets and straw, in particular granulated coal with a grain size of about 1 to 25 mm, preferably about 3 to 10 mm.
  • the firing system according to the invention is primarily for boiler and / or heating systems, e.g. Central or multi-storey heating in one and two-family houses, with outputs in the range of about 5 to 500 kW, preferably 10 to 25 kW, applicable.
  • Cooling jacket with respect to the support plate of the fluidized bed are arranged obliquely and the position of the outlet opening in the combustion chamber can be varied.
  • the formation of the body which enables the afterburning of the carbon monoxide without a catalytic effect is also advantageous and usable without restriction to fluidized bed firing in other firing systems, in particular in underfeed firing with combustion retorts.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)

Abstract

Pour éviter un refroidissement trop rapide du lit fluidisé pendant ces périodes d'arrêt et, par conséquent, pour pouvoir allonger ces périodes, la chaudière métallique (1) entourée d'une isolation thermique (11), est subdivisée en trois tronçons (8 à 10) isolés les uns des autres contre la conduction thermique directe. Le tronçon intermédiaire (9) reçoit la chambre de combustion (3), le tronçon inférieur (8) la chambre d'amenée (6) de l'air de combustion et le tronçon supérieur (10) une chambre vide (5). L'isolation (11) qui est, de préférence, aussi divisée en trois parties, comprend deux paires de rainures (15) qui recoivent les rebords des extrémités (16, 17) des tronçons de chaudière (8 à 10). Une alimentation de combustible (27) est munie d'une enveloppe de refroidissement (29) servant d'expansion (22) du lit fluidisé. Un évacuateur de cendres (35), dont l'organe d'arrêt est commandé par la pression de l'air de combustion dans la chambre d'amenée (6) de l'air de combustion, est disposé dans le tronçon de chaudière supérieur (10) au-dessus de la zone d'expansion (22). La partie supérieure de la chambre vide (5) reçoit un corps absorbant le rayonnement thermique pour créer une température ambiante favorisant la postcombustion du monoxyde de carbone sans catalyseur. La chaleur supplémentaire ainsi obtenue est transférée à un échangeur de chaleur secondaire supérieur.
EP19830902231 1982-07-23 1983-07-20 Four Withdrawn EP0118460A1 (fr)

Applications Claiming Priority (12)

Application Number Priority Date Filing Date Title
AT2868/82 1982-07-23
AT2869/82 1982-07-23
AT287082 1982-07-23
AT286982A ATA286982A (de) 1982-07-23 1982-07-23 Feuerungsanlage fuer feste brennstoffe
AT286782 1982-07-23
AT286882 1982-07-23
AT2870/82 1982-07-23
AT2867/82 1982-07-23
AT86583 1983-03-11
AT865/83 1983-03-11
AT232483 1983-06-24
AT2324/83 1983-06-24

Publications (1)

Publication Number Publication Date
EP0118460A1 true EP0118460A1 (fr) 1984-09-19

Family

ID=27542367

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830902231 Withdrawn EP0118460A1 (fr) 1982-07-23 1983-07-20 Four

Country Status (3)

Country Link
EP (1) EP0118460A1 (fr)
DK (1) DK113684D0 (fr)
WO (1) WO1984000599A1 (fr)

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Title
See references of WO8400599A1 *

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DK113684D0 (da) 1984-02-28
WO1984000599A1 (fr) 1984-02-16

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