EP0003831A1 - Procédé de combustion en lit fluidisé de déchets contenant des sels - Google Patents

Procédé de combustion en lit fluidisé de déchets contenant des sels Download PDF

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Publication number
EP0003831A1
EP0003831A1 EP79100508A EP79100508A EP0003831A1 EP 0003831 A1 EP0003831 A1 EP 0003831A1 EP 79100508 A EP79100508 A EP 79100508A EP 79100508 A EP79100508 A EP 79100508A EP 0003831 A1 EP0003831 A1 EP 0003831A1
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EP
European Patent Office
Prior art keywords
fluidized bed
mass
salt
bed mass
fluidized
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.)
Granted
Application number
EP79100508A
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German (de)
English (en)
Other versions
EP0003831B1 (fr
Inventor
Friedhelm Ing. Grad. Sahlmen
Gerhard Dr. Franke
Rolf Dipl.-Ing. Brockmann
Helmut Dipl.-Ing. Janz
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Bayer AG
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Bayer AG
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Publication date
Application filed by Bayer AG filed Critical Bayer AG
Publication of EP0003831A1 publication Critical patent/EP0003831A1/fr
Application granted granted Critical
Publication of EP0003831B1 publication Critical patent/EP0003831B1/fr
Expired legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/30—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a fluidised bed

Definitions

  • the invention relates to a process for the combustion of salt-laden residues in a fluidized bed furnace, in particular the combustion of sewage sludge loaded with salts.
  • Residues especially sewage sludge, are burned in fluidized bed furnaces with a sand bed at temperatures above 800 ° C.
  • the object of the invention is to operate the combustion of salt-laden, in particular alkali chloride and sulfate-laden residues in the fluidized bed furnace in such a way that continuous, undisturbed operation is economically achieved.
  • the present invention relates to a process for the combustion of salt-laden residues in a fluidized bed at temperatures of 730 to 900 ° C and with the removal of fluidized bed material, which is characterized in that before reaching a salt concentration in the fluidized bed material, in which the fluidized bed material at Operating temperature bakes together, part of the fluidized bed mass is discharged and replaced by fresh fluidized material.
  • the combustion of salt-laden residues is also guaranteed to be trouble-free and economical.
  • it has proven useful to increase the salt content to only half the critical value and to replace approx. 10% of the fluidized bed mass - in most cases, the quartz sand. If the salinity in - The fluidized bed mass is still sufficiently far from the critical concentration, a continuous concentration measurement is not necessary, and fluctuations in the composition of the sludge are also not critical.
  • the salt concentration in the fluidized bed mass continuously or discontinuously at intervals of 3 to 10 hours, preferably once per shift.
  • the conductivity of a suspension from a certain amount of fluidized bed mass with a certain amount of water is a sufficiently precise measure of its salt concentration.
  • the removal of a part of the fluidized bed mass is automated via a rotary valve depending on the analysis result, with a correspondingly large amount of fresh sand being added to the remaining fluidized bed mass, so that the salt concentration in the fluidized bed mass again reaches a low predetermined value for trouble-free operation.
  • it has been found sufficient to periodically regenerate the fluidized bed mass when a predetermined salt concentration in the fluidized bed mass is reached for example by replacing 10% of the fluidized bed mass with a corresponding amount of fresh fluidized material, for example sand).
  • the temperature in the fluidized bed is reduced.
  • the salt concentration at which the fluidized bed mass must be partially renewed can thereby be increased and more economical operation can be achieved due to the lower consumption of eddy material.
  • the afterburning temperature can be controlled by additional burners above the fluidized bed. This afterburning does not disturb the combustion in the fluidized bed.
  • the temperature in the fluidized bed is approximately 650 to 730 ° C., preferably 700 to 730 ° C., while in the post-combustion zone it is set to approximately 850 ° C., preferably 850 to 870 ° C.
  • This variant is particularly suitable for the combustion of sludge containing alkali chloride and sulfate, since the sulfates remain partly in the fluidized bed mass to be removed, while the chlorides essentially escape with the ash and are separated in the downstream electrostatic precipitator.
  • different materials can be used as the fluidized bed material.
  • quartz sand which is known per se, has proven successful in the present process.
  • boiler ash from the combustion of hard coal in granular form is preferably used.
  • This material offers further advantages over the use of quartz sand in the method according to the invention, e.g. B.
  • the throughput of sewage sludge is significantly higher and less air is needed to whirl up.
  • the low fluid bed density enables better burnout.
  • kettle ash also has a lower reactivity compared to e.g. B. alkali chlorides and alkali sulfates as quartz sand.
  • the pressed filter cake (sewage sludge) is pumped from a buffer tank via 1 into the fluidized bed furnace 2 and burned.
  • the throughput is 3500 kg sewage sludge per hour with a solids content of approx. 10 to 12% with a grate area of approx. 7 m 2 .
  • the non-combustible part consisting of ash and entrained salts, is largely discharged with the fluidizing air at 3, cooled and separated in the downstream electrostatic precipitator. It depends on the temperature in the fluidized bed, how much salt accumulates on the fluidized material and at what concentrations it cakes comes in the fluidized bed mass.
  • the fuel is added at 4.
  • the fuel supply is adjusted by the controller 5 so that the fluidized bed temperature does not exceed 730 ° C.
  • the required flue gas temperature of 850 ° C is ensured by a temperature-controlled 6 additional fuel feed 7 in the furnace chamber.
  • the required combustion air is sucked in by a radial blower 8 via mufflers, heated in the air preheater 9 and blown into the furnace 10 from below.
  • the furnace pressure is regulated by a suction fan (not shown).
  • Fluidized bed mass is withdrawn discontinuously in accordance with the salt load via the cellular wheel lock 11 and a trough chain conveyor 12.
  • Fresh quartz sand is added at 13 by a pneumatic conveying device 14.
  • the metering container 16 is filled via the time-controlled valve 15 and the sample is mixed via 17 in the vessel 18 with 1000 ml of distilled water 19 and the conductivity 20 of the suspension is measured. If the salt content is more than 5% by weight, about 10% of the fluidized bed is discharged via the rotary valve 11 and replaced by adding 13 new quartz sand.
  • the logical connections are Valves with the process computer not shown, as well as known control and regulating devices for operating the furnace.
  • the pressed filter cake (sewage sludge) is pumped from a buffer tank via 1 into the fluidized bed furnace 2 and burned.
  • the throughput rate is at a grid area of about 7 m 2 4200 kg of sewage sludge per hour with a solids content of about 10 to 12 '%.
  • the non-combustible part consisting of ash and entrained salts, is largely discharged with the fluidizing air at 3, cooled and separated in the downstream electrostatic precipitator. It depends on the temperature in the fluidized bed, how much salt accumulates on the fluidized material and from which concentrations there are accretions in the fluidized bed mass.
  • the fuel is added at 4.
  • the fuel supply is adjusted by the controller 5 so that the fluidized bed temperature does not exceed 730 ° C.
  • the required flue gas temperature of 850 ° C is ensured by a temperature-controlled 6 additional fuel feed 7 in the furnace chamber.
  • the required combustion air is sucked in by a radial blower 8 via mufflers, heated in the air preheater 9 and blown into the furnace 10 from below.
  • the furnace pressure is regulated by a suction fan (not shown).
  • Fluidized bed mass is discontinuously according to the salt load via the rotary valve 11 and one Trough chain conveyor 12 removed.
  • Fresh kettle ash at 13 is added by a pneumatic conveying device 14.
  • the metering container 16 is filled via the time-controlled valve 15 and the sample is mixed with 1000 ml of distilled water 19 in the vessel 18 via 17 and the conductivity 20 of the suspension is measured. If the salt content is more than 5% by weight, about 10% of the fluidized bed is discharged via the rotary valve 11 and replaced again by adding fresh kettle ash 13.
EP79100508A 1978-02-24 1979-02-21 Procédé de combustion en lit fluidisé de déchets contenant des sels Expired EP0003831B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19782808029 DE2808029A1 (de) 1978-02-24 1978-02-24 Verbrennung von salzbeladenen rueckstaenden in einem wirbelbettofen
DE2808029 1978-02-24

Publications (2)

Publication Number Publication Date
EP0003831A1 true EP0003831A1 (fr) 1979-09-05
EP0003831B1 EP0003831B1 (fr) 1980-10-29

Family

ID=6032868

Family Applications (2)

Application Number Title Priority Date Filing Date
EP79100417A Withdrawn EP0003792A3 (fr) 1978-02-24 1979-02-13 Procédé de combustion en lit fluidisé de déchets contenant des sels
EP79100508A Expired EP0003831B1 (fr) 1978-02-24 1979-02-21 Procédé de combustion en lit fluidisé de déchets contenant des sels

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP79100417A Withdrawn EP0003792A3 (fr) 1978-02-24 1979-02-13 Procédé de combustion en lit fluidisé de déchets contenant des sels

Country Status (2)

Country Link
EP (2) EP0003792A3 (fr)
DE (2) DE2808029A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0087195A2 (fr) * 1982-02-18 1983-08-31 Unilever N.V. Procédé de traitement des sous-produits formés au cours du raffinage des huiles et des graisses
WO1985002898A1 (fr) * 1983-12-24 1985-07-04 Johan Roos Four a combustion et procede de fabrication d'un combustible a partir d'ordures
DE3604318A1 (de) * 1986-02-12 1987-08-13 Metallgesellschaft Ag Verfahren zur verbrennung von kuhmist
DE3733831A1 (de) * 1987-10-07 1989-04-20 Saarbergwerke Ag Verfahren zur verbrennung von organischen substanzen, wie hausmuell, industriemuell und aehnlichem, unter verwendung einer wirbelschichtfeuerung

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3712801A1 (de) 1987-04-15 1988-11-03 Babcock Werke Ag Verfahren zum verfeuern von insb. salzhaltiger braunkohle
FR2710967B1 (fr) * 1993-10-05 1995-12-29 Fm Ind Procédé et unité de traitement par calcination de déchets dangereux.

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2416598A1 (de) * 1973-06-25 1975-01-16 Coal Industry Patents Ltd Verfahren zum verbrennen von klebrigen oder hochviskosen substanzen in einem schwebebett aus inertem oder katalytischem material
US3864458A (en) * 1973-06-11 1975-02-04 Dorr Oliver Inc Fluid bed incineration of chloride-containing waste streams
DE2338432A1 (de) * 1973-07-28 1975-02-13 Metallgesellschaft Ag Schlammverbrennung
DE2402517A1 (de) * 1974-01-19 1975-07-31 Uhde Gmbh Friedrich Verfahren zur thermischen behandlung von verunreinigter, salzhaltiger loesung
US3907674A (en) * 1974-04-24 1975-09-23 Dorr Oliver Inc Fluid bed incineration of wastes containing alkali metal chlorides
US4038188A (en) * 1975-03-14 1977-07-26 The Dow Chemical Company Method for preventing eutectic caking of sodium chloride at high temperatures
US4071612A (en) * 1974-10-15 1978-01-31 Friedrich Uhde Gmbh Process for the incineration of contaminated salt-bearing solutions

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3864458A (en) * 1973-06-11 1975-02-04 Dorr Oliver Inc Fluid bed incineration of chloride-containing waste streams
DE2416598A1 (de) * 1973-06-25 1975-01-16 Coal Industry Patents Ltd Verfahren zum verbrennen von klebrigen oder hochviskosen substanzen in einem schwebebett aus inertem oder katalytischem material
DE2338432A1 (de) * 1973-07-28 1975-02-13 Metallgesellschaft Ag Schlammverbrennung
DE2402517A1 (de) * 1974-01-19 1975-07-31 Uhde Gmbh Friedrich Verfahren zur thermischen behandlung von verunreinigter, salzhaltiger loesung
US3907674A (en) * 1974-04-24 1975-09-23 Dorr Oliver Inc Fluid bed incineration of wastes containing alkali metal chlorides
US4071612A (en) * 1974-10-15 1978-01-31 Friedrich Uhde Gmbh Process for the incineration of contaminated salt-bearing solutions
US4038188A (en) * 1975-03-14 1977-07-26 The Dow Chemical Company Method for preventing eutectic caking of sodium chloride at high temperatures

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CHEMIE INGENIEUR TECHNIK, Vol. 41, Nr. 10, Mai 1969, Weinheim, E. ALBRECHT: "Schlammverbrennung im Wirbelschichtofen", Seiten 615-619. *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0087195A2 (fr) * 1982-02-18 1983-08-31 Unilever N.V. Procédé de traitement des sous-produits formés au cours du raffinage des huiles et des graisses
EP0096946A2 (fr) * 1982-02-18 1983-12-28 Unilever N.V. Procédé de traitement des sous-produits formés au cours du raffinage des huiles et des graisses
EP0087195A3 (fr) * 1982-02-18 1984-05-16 Unilever N.V. Procédé de traitement des sous-produits formés au cours du raffinage des huiles et des graisses
EP0096946A3 (fr) * 1982-02-18 1984-08-15 Unilever N.V. Procédé de traitement des sous-produits formés au cours du raffinage des huiles et des graisses
WO1985002898A1 (fr) * 1983-12-24 1985-07-04 Johan Roos Four a combustion et procede de fabrication d'un combustible a partir d'ordures
DE3604318A1 (de) * 1986-02-12 1987-08-13 Metallgesellschaft Ag Verfahren zur verbrennung von kuhmist
US4747356A (en) * 1986-02-12 1988-05-31 Metallgesellschaft Ag Process of burning cattle dung
DE3733831A1 (de) * 1987-10-07 1989-04-20 Saarbergwerke Ag Verfahren zur verbrennung von organischen substanzen, wie hausmuell, industriemuell und aehnlichem, unter verwendung einer wirbelschichtfeuerung

Also Published As

Publication number Publication date
DE2960032D1 (en) 1981-01-29
EP0003831B1 (fr) 1980-10-29
EP0003792A2 (fr) 1979-09-05
DE2808029A1 (de) 1979-08-30
EP0003792A3 (fr) 1979-10-03

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