Classifications

• • 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
• • G—PHYSICS
  • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
  • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
  • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
  • G21F9/04—Treating liquids
  • G21F9/06—Processing
  • G21F9/14—Processing by incineration; by calcination, e.g. desiccation
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
  • F23G2209/00—Specific waste
  • F23G2209/18—Radioactive materials

Definitions

• the present invention relates to a method for incinerating graphite, in particular irradiated graphite and more generally a combustible material, such as waste, with a limited production of fumes, in order to avoid significant and costly treatment thereof.
• the invention proposes a process for incinerating a material, with a prior preparation of the latter.
• the process comprises, before combustion, the continuous production of the following steps: division of the material into particles,
• the oxidizing gas can be oxygen or enriched air and the pressure of the foam obtained will be of the order of 2 to 10 bars, depending on whether the opening of a regulating valve located before the combustion furnace, i.e. the pressure in the furnace and the pressure drop between the pump outlet and the combustion furnace.
• the maximum of the solid fraction (from 35 to 45% by weight of the suspension) will depend on the apparent density of the pulverized solid and on its lower calorific value. For example, since graphite has a high calorific value and an apparent density, the solid fraction will be of the order of 35%. For lower criteria, the fraction may be higher without damaging the pumpable nature of the product or leading to too hot combustion.
• the powdered graphite obtained at the outlet of the mills 2 is added with water in a mixer 3.
• a pump 4 With the aid of a pump 4, the continuous circulation of the product coming from the mixer 3 is ensured in the direction for example of a concentration 5 (acting by measuring the viscosity for example) to result in a mixer 6 for adjusting this concentration by adding water.
• the product leaving this mixer 6 will have a content at most equal to 35% of solid particles.
• This is a relatively charged aqueous suspension which is very easily pumpable.
• This suspension is by means of a pump 7 introduced into a mixer 8 intended to produce a three-phase liquid-solid-gas mixture. To do this, is introduced into the mixer, in addition to the suspension to be transformed into foam, surfactant additives 9 and a swelling gas 10. In the present case the gas will be oxygen.
• the pressurization of the foam has a double advantage: firstly it becomes self-propelling by partial expansion in the supply lines 12 of a combustion hearth 13, and secondly the relaxation of this foam in the hearth promotes his injection.
• the hearth 13 is a cyclone hearth known in itself which has the advantages mentioned above with regard to the residence time of the particles and the relative gas-solid speed, in order to achieve complete combustion of the product.
• Oxygen 14 is introduced into the hearth 13 as combustion gas. It should be noted that the combustion may include a post-combustion stage.
• the ashes are collected in an ashtray 15 while the fumes 16 are led into a water cooler 17 which makes it possible to condense the water vapor produced by combustion.
• This cooler will include a devesiculator retaining the droplets of water.
• the fumes thus freed from the aqueous effluents pass through a heater 18 which places them at a temperature above the dew point to avoid any condensation which could be detrimental to the operation of the very high efficiency filters 19 through which the fumes pass.
• These filters make it possible to trap the solid residues 20 while the gaseous phase of the fumes is transmitted to the atmosphere by an extraction fan and a chimney 22.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• High Energy & Nuclear Physics (AREA)
• Mechanical Engineering (AREA)
• Processing Of Solid Wastes (AREA)
• Carbon And Carbon Compounds (AREA)
• Gasification And Melting Of Waste (AREA)
• Production Of Multi-Layered Print Wiring Board (AREA)
• Structure Of Printed Boards (AREA)
• Physical Or Chemical Processes And Apparatus (AREA)
• Air Supply (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9415106

Family Applications (1)

Country Status (8)

Citations (3)

• 1991
  • 1991-07-15 FR FR9108899A patent/FR2679320B1/fr not_active Expired - Fee Related
• 1992
  • 1992-07-09 AT AT92915960T patent/ATE134432T1/de not_active IP Right Cessation
  • 1992-07-09 JP JP5502617A patent/JPH0697088B2/ja not_active Expired - Lifetime
  • 1992-07-09 ES ES92915960T patent/ES2085632T3/es not_active Expired - Lifetime
  • 1992-07-09 WO PCT/FR1992/000659 patent/WO1993002321A1/fr not_active Ceased
  • 1992-07-09 EP EP92915960A patent/EP0593665B1/de not_active Expired - Lifetime
  • 1992-07-09 CA CA002113109A patent/CA2113109C/fr not_active Expired - Fee Related
  • 1992-07-09 DE DE69208467T patent/DE69208467T2/de not_active Expired - Fee Related

Patent Citations (3)

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