EP0073787B1 - Method for destruction of problematic wastes - Google Patents

Method for destruction of problematic wastes Download PDF

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Publication number
EP0073787B1
EP0073787B1 EP82900672A EP82900672A EP0073787B1 EP 0073787 B1 EP0073787 B1 EP 0073787B1 EP 82900672 A EP82900672 A EP 82900672A EP 82900672 A EP82900672 A EP 82900672A EP 0073787 B1 EP0073787 B1 EP 0073787B1
Authority
EP
European Patent Office
Prior art keywords
wastes
water
pumpable
dispersion
problematic
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.)
Expired
Application number
EP82900672A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0073787A1 (en
Inventor
Tor Ragnar Hem
Dennis Sogaard
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.)
Hem Thor Ragnar
Original Assignee
DENTOR ENERGI AS
Hem Thor Ragnar
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 DENTOR ENERGI AS, Hem Thor Ragnar filed Critical DENTOR ENERGI AS
Priority to AT82900672T priority Critical patent/ATE21446T1/de
Publication of EP0073787A1 publication Critical patent/EP0073787A1/en
Application granted granted Critical
Publication of EP0073787B1 publication Critical patent/EP0073787B1/en
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L1/00—Liquid carbonaceous fuels
    • C10L1/32—Liquid carbonaceous fuels consisting of coal-oil suspensions or aqueous emulsions or oil emulsions
    • C10L1/328—Oil emulsions containing water or any other hydrophilic phase
    • 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
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment

Definitions

  • the present invention relates to a method for destruction of problematic wastes from the paint and lacquer industry, the plastics materials industry, the metal industry, the wood pulp industry, the shipping industry, petrochemical plants etc., i.e. wastes of the type discarded paints, paint sludge, greasy wastes, distillation residues etc., possibly containing oil sludge, organic compounds, etc.
  • wastes are called "problematic wastes"
  • problems have till now been involved in handling of such wastes for disposal and/or destruction.
  • the wastes are largely solid, viscous or sticky materials which are non-pumpable, the viscosity being above 100.000 cP and the solid matter content being close to 100%, usually about 80%.
  • Such materials have previously been incinerated in rotary furnaces of the same type as the cement kilns used for calcining cement.
  • the material is fed to the upper end of the inclined rotary furnace, and at the same time oil is burned in order to increase the temperature and thereby enhance the combustion of the wastes.
  • Such rotary furnace plants are extremely large and expensive. They operate with a large surplus of air and the efficiency is relatively low.
  • the object of the invention is to provide a method for destruction of such problematic wastes, which method may be carried out in substantially smaller' and cheaper plants, and which can produce heat with greater efficiency.
  • wastes may be dispersed with water, whereby the wastes become pumpable and may be used as fuel in burners similar to oil burners.
  • the water will primarily have a lubricating effect and thereby prevent clogging of pumps and pipes.
  • the invention consists in that the waste by mechanical mixing and, if required, by tearing and/or comminuting are dispersed in water to saturation, preferably to a water content of 20 to 40%, whereby a pumpable dispersion is obtained, which may be used as a fuel.
  • the problematic wastes may for instance be received in large barrels which are emptied into a trough having a paddle screw for coarsely breaking lumps and viscous mass with addition of water through nozzles for lubrication and reduction of the rate of evaporation of solvents, whereupon the coarsely broken mass is treated in a high speed mixer with addition of further water for comminuting lumps and preparing a homogeneous solution and dispersion in the water.
  • a mixture having a solid matter content of about 50% and a viscosity of below 1500 cP.
  • the pumpable dispersion obtained in the high speed mixture is drawn by vacuum into a combined pressure/vacuum tank, and a new charge is fed to the high speed mixer for comminuting and dispersing.
  • the pumpable dispersion in the pressure/vacuum tank is forced through a self-cleaning filter to a storage tank in which continuous agitation is preferably effected. Even without continuous agitation the ingredients in the mixture will separate only to a small degree, and the dispersion may therefore at any time be re-established by a comparatively small -mixing effort.
  • the single Figure is a side view, partly in section, through parts of an apparatus for carrying out the method according to the invention.
  • a trough 1 having a double paddle screw 2 driven by a motor 3.
  • Wastes to be treated are emptied into the trough 1.
  • the wastes may be supplied in barrels which after opening are lifted onto a support adjacent to the trough.
  • the support may be somewhat tilted in order to make the contents settle slowly from the barrels. Such settling will usually take place if recourse is had to time, since even viscous wastes are usually emptied in about one hour's time. If the wastes are extremely hard, hand tools may be used to accelerate the emptying operation.
  • the wastes may comprise sticky binders and pigments obtained as a distillation residue from paints, and wastes containing gelled two-component binders.
  • Very solid wastes may be involved, even after a gelled top slab or "cake" has been removed.
  • a grating may be provided on the top of the trough. It may be necessary to remove this grating if the wastes are especially hard.
  • lumps and viscous mass are coarsely broken in water added through nozzles. In this connection the water serves for lubrication, and at the same time it reduces the rate of evaporation of any organic solvents.
  • a sluice gate 4 which may be raised in order to allow greater or smaller portions of the contents of the trough to flow into a high speed mixer 5 consisting of a container equipped with an agitating device 6 mounted on a vertical shaft 7.
  • the dispersion may be pumped direct to special atomizing nozzles in a combustion chamber in order to utilize the heat energy in the wastes.
  • the dispersion - may be transported in tank lorries to combustion plants in for instance manufacturing companies which may use the heat energy produced. This energy will of course be somewhat reduced because of the addition of water, but this reduction is more than balanced by the fact that a consistency of the. wastes has been obtained which allows pumping and combustion in waste burners.
  • the flue gases are relatively easy to clean, which is probably due to the fact that the atomizing obtained produces an agglomeration of non-combustible particles after the combustion zone, so that the size of the solid particles in the flue gases is increased. If the flue gases should be acid, they may easily be neutralized by the addition of for instance caustic soda, NaOH, to the mixture.
  • the surplus of air may be reduced to approximately stoichiometric ratios. More specifically the air surplus may be about 15%, meaning that the ratio between the actual and stoichiometric amounts of air is about 1.15 as opposed to about 2 in a fluidized bed combustion and 3-4 in a combustion in a rotary furnace.
  • the small surplus of air in connection with the high water content will reduce possible formation of free chlorine. Any chlorine molecules will agglomerate with the flue particles and may be caught in bag filters.
  • the original wastes may contain solvents of class A and B. These solvents are usually present as a relatively small part of the mixture, but still warrant a classification as A or B liquid. In this connection the additional water will inhibit the evaporation of solvents because of the vapour partial pressure of the water and increase the flashing point of solvents which are miscible with water.
  • the risk of reaction between the various compounds in the mixture has proved to be small. This may be due to the fact that water is a good heat conductor and that water reduces the contact between the compounds.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Processing Of Solid Wastes (AREA)
  • Pens And Brushes (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Golf Clubs (AREA)
EP82900672A 1981-03-06 1982-03-05 Method for destruction of problematic wastes Expired EP0073787B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82900672T ATE21446T1 (de) 1981-03-06 1982-03-05 Verfahren zur vernichtung von problemabfaellen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO810780A NO150372C (no) 1981-03-06 1981-03-06 Fremgangsmaate ved destruksjon av problemavfall
NO810780 1981-03-06

Publications (2)

Publication Number Publication Date
EP0073787A1 EP0073787A1 (en) 1983-03-16
EP0073787B1 true EP0073787B1 (en) 1986-08-13

Family

ID=19885936

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82900672A Expired EP0073787B1 (en) 1981-03-06 1982-03-05 Method for destruction of problematic wastes

Country Status (3)

Country Link
EP (1) EP0073787B1 (no)
NO (1) NO150372C (no)
WO (1) WO1982003112A1 (no)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5139204A (en) * 1990-10-11 1992-08-18 Chemical Waste Management, Inc. Method for recovering hazardous waste material
DK171956B1 (da) * 1995-06-23 1997-08-25 Carbo Consult Ltd Fremgangsmaade til behandling af problematisk organisk kemisk affald samt anlaeg til brug ved fremgangsmaaden
GB9721318D0 (en) 1997-10-09 1997-12-10 Farr Kenneth Operational pallet based system for handling material goods

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR511505A (fr) * 1920-03-12 1920-12-28 Utilisation Des Combustibles P Pulvérisateur-bruleur
US1926071A (en) * 1931-06-24 1933-09-12 Joseph A Vance Liquid fuel
US3241505A (en) * 1963-07-17 1966-03-22 Combustion Eng System for regulating the supply of pulverized fuel slurry to a furnace
GB1337116A (en) * 1970-11-20 1973-11-14 Wintershall Ag Process for the incineration of pumpable liquid/solid mixtures
US3762887A (en) * 1970-12-14 1973-10-02 Consolidation Coal Co Fuel composition

Also Published As

Publication number Publication date
NO810780L (no) 1982-09-07
NO150372C (no) 1984-10-03
EP0073787A1 (en) 1983-03-16
NO150372B (no) 1984-06-25
WO1982003112A1 (en) 1982-09-16

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