US3799074A - Furnaces for burning sewage and like residues - Google Patents

Furnaces for burning sewage and like residues Download PDF

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Publication number
US3799074A
US3799074A US00301197A US30119772A US3799074A US 3799074 A US3799074 A US 3799074A US 00301197 A US00301197 A US 00301197A US 30119772 A US30119772 A US 30119772A US 3799074 A US3799074 A US 3799074A
Authority
US
United States
Prior art keywords
hearth
chamber
tank
level
burners
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 - Lifetime
Application number
US00301197A
Other languages
English (en)
Inventor
J Stribling
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.)
LUCAS FURNACE DEV Ltd
Original Assignee
LUCAS FURNACE DEV Ltd
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 LUCAS FURNACE DEV Ltd filed Critical LUCAS FURNACE DEV Ltd
Priority to US00301197A priority Critical patent/US3799074A/en
Priority to AU61320/73A priority patent/AU481240B2/en
Priority to NL7314333A priority patent/NL7314333A/xx
Priority to BE136869A priority patent/BE806282A/xx
Priority to CH1490373A priority patent/CH567688A5/xx
Priority to AR250647A priority patent/AR198009A1/es
Priority to TR17639A priority patent/TR17639A/xx
Priority to AT904773A priority patent/ATA904773A/de
Priority to DD17429273A priority patent/DD107769A5/xx
Priority to NO4129/73A priority patent/NO134717C/no
Priority to FR7338086A priority patent/FR2204781B1/fr
Priority to LU68684D priority patent/LU68684A1/xx
Priority to DE19732353519 priority patent/DE2353519A1/de
Priority to JP12064373A priority patent/JPS5025070A/ja
Priority to ZA738285A priority patent/ZA738285B/xx
Priority to IT3063873A priority patent/IT999013B/it
Priority to BR8398/73A priority patent/BR7308398D0/pt
Priority to ES420010A priority patent/ES420010A1/es
Priority to IL43490A priority patent/IL43490A/en
Application granted granted Critical
Publication of US3799074A publication Critical patent/US3799074A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/008—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for liquid waste
    • 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
    • F23G5/32—Incineration of waste; Incinerator constructions; Details, accessories or control therefor the waste being subjected to a whirling movement, e.g. cyclonic incinerators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S588/00—Hazardous or toxic waste destruction or containment
    • Y10S588/90—Apparatus

Definitions

  • ABSTRACT provides a furnace for burning sewage comprising a chamber enclosing a pool of the sewage and a burner directed downwardly onto the pool to bathe the whole of the surface of the pool in flame, the pool having a floor which is conical in two stages, so that the area of liquid subject to flame can be controlled by varying the level of the liquid relative to the conical area.
  • This invention relates to furnaces for burning liquid waste such as sewage and like residues.
  • a liquid which is a mixture of filtrate and decantrate and has a solids content possibly as high as percent, and the necessity for burning is due to the bacterial and biological characteristics of the liquid.
  • This burning step is difficult both because of the low calorific value of the liquid/solids and also because, in evaporating water from the liquid, an extremely unpleasant smell is generated and there is a danger of contamination from escaping vapours. Similar difficulties arise with other waste liquids containing industrial solvents.
  • a furnace for burning sewage and the like comprises a chamber and burner means for firing downwardly onto a pool of sewage or the like in the chamber and arranged so that the whole or substantially the whole of the exposed surface of the pool is bathed in flame.
  • This provides direct heat transfer from flame to liquid at high efficiency due to the turbulence created by the flame avoiding film insulation effects, and ensures that evaporating liquid passes essentially through the flame.
  • the chamber is circular in plan and the burner means fires tangentially and slightly downwardly onto the pool and in a convenient arrangement a plurality of burners is arranged preferably symmetrically, around and slightly above the level of the pool and firing tangentially and downwardly onto the pool.
  • the chamber has a valve controlled inlet for the sewage and an exhaust orifice.
  • FIG. 1 is an elevation of one embodiment of the invention.
  • FIG. 2 is a part sectioned elevation of an alternative embodiment
  • FIG. 3 is a plan view of the embodiment of FIG. 2;
  • FIG. 4 is a further elevation of the embodiment of FIG. 2.
  • the furnace comprises a chamber 1 generally circular in plan, supported by a frame A and having a tank 2 and a detachable frusto-conical roof 3, both made of corrosion resistant metal such as stainless steel for example.
  • the tank is lined with ceramic fibre insulating material 4, and has an inner lining of silicon carbide 5.
  • the roof is also lined with silicon carbide at 6 so that the whole of the chamber interior wall is non-porous and resistant to temperature cycling.
  • a series of gas or oil burners 7, of heat output in excess of that theoretically required for evaporation and combustion, are disposed with their nozzles arranged at intervals around the chamber and directed generally tangentially and downwardly.
  • This arrangement bathes the whole surface of the pool of waste, which is located in the chamber, in flame, but produces a pattern of flame and the vapours and combustion products so that the vapours pass upwardly in a central vortex and out through the outlet 10 which is disposed axially above the pool.
  • the remainder of the furnace is the same as that shown in FIG. 1.
  • the sewage products are led to the chamber 2 by an inlet pipe 14 controlled by a valve 15 which may be operated manually or by automatic means controlled at will or by a thermostat shown at 16, in accordance with furnace temperature, the thermostat being arranged so as to open the valve when a temperature is exceeded and to close the valve when the temperature falls below that temperature.
  • the burners may also be controlled by a thermostat shown at 17 on the outlet pipe.
  • the burners may be used to pre-heat the furnace prior to introduction of material to be burnt, and for post-burning sterilisation of the chamber.
  • the hearth or floor of the chamber 2 again has a central rising delivery pipe 20 for liquids to be burnt and this opens into a first frusto-conical space 22 which in turn opens to a second and much shallower frusto-conical space 24 which extends to the chamber side wall 26.
  • Burners 7 again open tangentially and slightly downwardly and are connected via controls to the fuel supplies and combustion air manifolds 28.
  • the chamber is generally cylindrical and the height of the cylindrical portion may be slightly more than the diameter: preferably the height/diameter ratio is between 3:4 and 3:2.
  • a frusto-conical cyclone final combustion chamber 30 which opens to offtake duct 32 leading to a scrubber 34 and via a fan 36 to chimney 38.
  • Waste liquid is fed from tank 40 to a weir tank 42 having a vertically adjustable weir plate 48 so that liquid flows over the plate and is maintained at the same height in the parts 20, 22, 24, as the weir.
  • the chamber is pre-heated by burning fuel in the burners and a cyclonic pattern of burning material is induced by the direction of the burners and the combustion air inlets which may be separate from the burners but are similarly directed.
  • Waste liquid is admitted to a level dependant upon the weir plate (or equivalent means) according to the nature of the waste and the operating conditions in the furnace: thus if the liquid has a high solvent content and the solvent is inflammable and of a high calorific value the level of the surface of the waste will lie within cone 22 and when the burners 7 are shut off will maintain combustion. Cyclonic flow will be maintained by virtue of the combustion air flow, and in the cyclone area 30 this will cause a high efficiency vortex of flame to ensure completion of combustion before the gases leave the furnace.
  • the waste is of low calorific value e.g. if it has a high water content, a larger surface area of burning waste is accommodated by increasing the level height to within cone 24 and at minimum fuel value of the waste, when the burners 7 may require to be run continuously and at high heat input, the pool of waste will occupy the whole area of the cylindrical portion of the furnace.
  • the temperature sensor is connected primarily to the burners and the waste supply control so that as temperature exceeds a predetermined minimum the burners are shut off and vice versa, and as temperature exceeds a predetermined maximum the weir plate is lowered or the waste delivery pumps are shut off to lower the waste level and hence reduce the combustion rate, and again vice versa, these controls all operating between pre-set limits.
  • the furnace is adapted for automatic variation of combustion rate with a bias towards operating at the maximum rate of waste destruction in most efficient manner, he. at the highest temperature possible having regard to safety and the furnace construction, and with minimum fuel input from the burners.
  • the CO sensor is particularly useful for controlling the level of the weir plate, or for reducing and increasing, or cutting-off and re-opening the supply of liquid to be burnt in cases where a weir plate is not employed.
  • any convenient number of burners may be employed, and these may be fired by any suitable means. Multiple inlets and outlets may be provided in place of the single ones shown.
  • the silicon carbide lining referred to may be replaced by other suitable materials.
  • a furnace for burning liquid waste comprising:
  • a hearth located at the base of said chamber
  • a conduit for conducting the liquid waste to be burnt extending beneath the hearth and terminating at an inlet opening provided in the hearth whereby the liquid waste may be introduced into the chamber as a pool covering at least part of the hearth;
  • a plurality of fuel burners arranged around said chamber above the hearth and all arranged generally tangentially and downwardly to direct flame and combustion products towards the hearth and set up cyclonic action of the combustion products; and an exhaust outlet disposed above the burners so that evaporated liquid waste and products of combustion pass through a hottest zone within the chamber during passage from the hearth surface to the outlet when the burners are operating;
  • said chamber including a conical cyclone area located between said burners and said outlet for creating a final combustion vortex.
  • a furnace according to claim 2 including a tank for receiving liquid waste, an overflow weir provided in the tank to maintain the contents of the tank at a predetermined level, said conduit communicating with the contents of the tank, and the upper edge of said weir being located at a level above said inlet opening provided in the hearth whereby the level of waste liquid in the chamber corresponds with said predetermined level.
  • a furnace according to claim 2 wherein the hearth surface comprises an outer shallow frusto-conical zone and an inner steep frusto-conical zone.
  • a furnace according to claim 5 including a tank for receiving liquid waste, an overflow weir provided in the tank to maintain the contents of the tank at a predetermined level, said conduit communicating with the contents of the tank, and the upper edge of said weir being located at a level above said inlet opening provided in the hearth whereby the level of waste liquid in the chamber corresponds with said predetermined level.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Incineration Of Waste (AREA)
  • Heat Treatment Of Water, Waste Water Or Sewage (AREA)
  • Paper (AREA)
US00301197A 1972-10-26 1972-10-26 Furnaces for burning sewage and like residues Expired - Lifetime US3799074A (en)

Priority Applications (19)

Application Number Priority Date Filing Date Title
US00301197A US3799074A (en) 1972-10-26 1972-10-26 Furnaces for burning sewage and like residues
AU61320/73A AU481240B2 (en) 1972-10-26 1973-10-12 Improvements relating to furnaces
NL7314333A NL7314333A (da) 1972-10-26 1973-10-18
BE136869A BE806282A (fr) 1972-10-26 1973-10-19 Fours
CH1490373A CH567688A5 (da) 1972-10-26 1973-10-23
AR250647A AR198009A1 (es) 1972-10-26 1973-10-23 Horno quemador evaporador de desechos liquidos y residuos contenidos en los mismos
TR17639A TR17639A (tr) 1972-10-26 1973-10-24 Lagim ve benzer bakiyeleri yakmaga mahsus firinlar
LU68684D LU68684A1 (da) 1972-10-26 1973-10-25
NO4129/73A NO134717C (da) 1972-10-26 1973-10-25
FR7338086A FR2204781B1 (da) 1972-10-26 1973-10-25
AT904773A ATA904773A (de) 1972-10-26 1973-10-25 Ofen zur verbrennung flussiger abfallprodukte
DE19732353519 DE2353519A1 (de) 1972-10-26 1973-10-25 Ofen zur verbrennung fluessiger abfaelle
DD17429273A DD107769A5 (da) 1972-10-26 1973-10-25
ZA738285A ZA738285B (en) 1972-10-26 1973-10-26 Improvements relating to furnaces
IT3063873A IT999013B (it) 1972-10-26 1973-10-26 Forni per la combustione di rifiuti liquidi
BR8398/73A BR7308398D0 (pt) 1972-10-26 1973-10-26 Aperfeicoamentos em fornos e processos para queimar residuos liquidos
JP12064373A JPS5025070A (da) 1972-10-26 1973-10-26
ES420010A ES420010A1 (es) 1972-10-26 1973-10-26 Perfeccionamientos en hornos para quemar residuos liquidos.
IL43490A IL43490A (en) 1972-10-26 1973-10-26 Furnace for burning liquid waste

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00301197A US3799074A (en) 1972-10-26 1972-10-26 Furnaces for burning sewage and like residues

Publications (1)

Publication Number Publication Date
US3799074A true US3799074A (en) 1974-03-26

Family

ID=23162365

Family Applications (1)

Application Number Title Priority Date Filing Date
US00301197A Expired - Lifetime US3799074A (en) 1972-10-26 1972-10-26 Furnaces for burning sewage and like residues

Country Status (10)

Country Link
US (1) US3799074A (da)
AR (1) AR198009A1 (da)
AT (1) ATA904773A (da)
BE (1) BE806282A (da)
BR (1) BR7308398D0 (da)
FR (1) FR2204781B1 (da)
IL (1) IL43490A (da)
NO (1) NO134717C (da)
TR (1) TR17639A (da)
ZA (1) ZA738285B (da)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4085689A (en) * 1976-07-01 1978-04-25 Seymour Kershner Fibrous filter incinerator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2821782C2 (de) * 1979-09-13 1984-06-07 Moskovskij energetičeskij institut, Moskva Verfahren zur thermischen Unschädlichmachung von Abwässern
FR2484609A1 (fr) * 1980-06-13 1981-12-18 Rhone Poulenc Ind Procede de traitement d'effluents aqueux contenant des substances organiques et des sels mineraux

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2592491A (en) * 1948-02-14 1952-04-08 Florian C Toepel Garbage incinerating unit
US3362359A (en) * 1965-04-09 1968-01-09 Chicago Bridge & Iron Co Grease burner
US3482533A (en) * 1968-06-28 1969-12-09 Borge Richard Ankersen Incinerators
US3483832A (en) * 1968-04-16 1969-12-16 Solvents Recovery Service Of N Apparatus for burning industrial wastes
US3704676A (en) * 1971-09-13 1972-12-05 Kanting Oilfield Services Ltd Sludge incinerator

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB736418A (en) * 1952-08-21 1955-09-07 Thompson John Water Tube Boilers Ltd Improvements in or relating to combustion apparatus
GB1239482A (da) * 1968-04-16 1971-07-14
CH485985A (fr) * 1968-11-12 1970-02-15 Rasconi Alexandre Four pour la combustion de liquide
DE2112377A1 (de) * 1970-03-16 1971-10-14 Ppg Industries Inc Verfahren und Vorrichtung zur Beseitigung von fluessigen Abfaellen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2592491A (en) * 1948-02-14 1952-04-08 Florian C Toepel Garbage incinerating unit
US3362359A (en) * 1965-04-09 1968-01-09 Chicago Bridge & Iron Co Grease burner
US3483832A (en) * 1968-04-16 1969-12-16 Solvents Recovery Service Of N Apparatus for burning industrial wastes
US3482533A (en) * 1968-06-28 1969-12-09 Borge Richard Ankersen Incinerators
US3704676A (en) * 1971-09-13 1972-12-05 Kanting Oilfield Services Ltd Sludge incinerator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4085689A (en) * 1976-07-01 1978-04-25 Seymour Kershner Fibrous filter incinerator

Also Published As

Publication number Publication date
AR198009A1 (es) 1974-05-24
FR2204781A1 (da) 1974-05-24
ATA904773A (de) 1977-03-15
BR7308398D0 (pt) 1974-09-05
AU6132073A (en) 1975-04-17
TR17639A (tr) 1975-07-23
FR2204781B1 (da) 1976-06-18
BE806282A (fr) 1974-02-15
IL43490A (en) 1977-01-31
NO134717B (da) 1976-08-23
ZA738285B (en) 1974-09-25
NO134717C (da) 1976-12-01

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