US3858535A - Process for incinerating slurry and apparatus therefor - Google Patents

Process for incinerating slurry and apparatus therefor Download PDF

Info

Publication number
US3858535A
US3858535A US378721A US37872173A US3858535A US 3858535 A US3858535 A US 3858535A US 378721 A US378721 A US 378721A US 37872173 A US37872173 A US 37872173A US 3858535 A US3858535 A US 3858535A
Authority
US
United States
Prior art keywords
slurry
ash
incinerator
incineration
hot combustion
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
US378721A
Other languages
English (en)
Inventor
Kaoru Shiba
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.)
Ebara Corp
Original Assignee
Ebara Infilco Co 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
Priority to GB2166073A priority Critical patent/GB1426389A/en
Priority to FR7316781A priority patent/FR2237127B1/fr
Priority to NL7306478A priority patent/NL7306478A/xx
Priority to CH658373A priority patent/CH555786A/de
Priority to CA170,908A priority patent/CA978032A/en
Application filed by Ebara Infilco Co Ltd filed Critical Ebara Infilco Co Ltd
Priority to US378721A priority patent/US3858535A/en
Application granted granted Critical
Publication of US3858535A publication Critical patent/US3858535A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J1/00—Removing ash, clinker, or slag from combustion chambers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
    • 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
    • F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations

Definitions

  • ABSTRACT Partially dried slurry containing organic matter and ash-forming components are dried by means of the combustion heat generated in subsequent combustion of the dried slurry.
  • the dried slurry is transferred in powder form into an incinerator wherein it is burned in suspended condition.
  • the temperature of the incinerator is kept above the melting point of the ash formed therein. Where the melting point of the ash is high, it is lowered by the addition of salts of sodium or calcium prior to incineration.
  • the incinerated ash in fused condition is separated from the hot combustion gases which then pass on to the dryer.
  • the ash produced during incineration is in finely divided form, scattering of the ash occurs during storage and transportation. Moreover, since the ash generally contains some organic material, applications for same cannot be found. When water is sprinkled on the ash, it becomes claylike and even more difficult to handle.
  • the melting point of the ash is high, it is lowered by adding salts of sodium or calcium to the dried slurry prior to transporting to the incinerator.
  • the ash is separated from the flue gas leaving the incinerator proximate the bottom thereof and the flue gas is lead to the dryer where it dries the incoming slurry.
  • the fused ash is withdrawn from the flue in molten form and may be dropped into water to be formed into small particles or may be solidified into cakes or blocks.
  • an object of the present invention is to provide an improved process for the treatment of slurry containing sewage, organic waste and inorganic components wherein the final product consists of ash in granularor block form and combustion gases free of ash fines and malodorous components.
  • Another object of the present invention is to provide an improved process for the incineration of slurry containing organic and inorganic waste products wherein the heat of combustion of said organic products is used for drying incoming slurry.
  • a further object of the present invention is to provide an improved process for incineration of slurry containing organic and inorganic matter wherein calcium or sodium salts may be added to lower the melting point of ash formed during incineration.
  • a significant object of the present invention is to provide improved apparatus for the incineration of slurry containing sewage and inorganic matter wherein the heat of combustion of organic components is used for drying of said slurry in preparation for incineration and wherein ash produced during incineration is removed in fused form.
  • the invention accordingly comprises the several steps and the relation of'one or more of such steps with respect to each of the others, and the apparatus embodying features of construction, combination of elements and arrangement of parts which are adapted to effect such steps. all as exemplified in the following detailed disclosure, and the scope of the invention will be indicated in the claims.
  • FIG. 1 is a diagrammatic view of an apparatus in accordance with the present invention.
  • FIG. 2 is an embodiment thereof comprising an indirect dryer.
  • the feed to the apparatus of the present invention is assumed to be a filter-cake obtained by filtering and dehydrating slurry from a sedimentation pond or the like.
  • the filter-cake contains from 60 to percent of water and is introduced by means of conveyor 1 into drier 2 in which the water is removed by direct or indirect contact with the hot gases from incinerator 6.
  • the dried product leaving dryer 2 is pulverized and may be stored in storage tank 3.
  • Dust contained in the exhaust gas from drier 2 is collected by a cyclone separator (not shown).
  • the exhaust gas from the cyclone is washed with water and water contaminated with dust is fed back to the sedimentation pond.
  • the powdered slurry is removed from storage tank 3 through valve 4 and fed into injector 15 which fluidizes the slurry in an air stream and conveys the slurry through air conveyor 5 to incinerator 6.
  • injector 15 Auxiliary air for combustion in incinerator 6 is supplied by blower 7.
  • fuel may be injected at burner 8.
  • the melting point of the ash formed in the combustion of the slurry is high, the melting point of the ash may be lowered by adding a small amount of salts of sodium or calcium to the dried powdery slurry stored in the storage tank 3.
  • Suitable materials are salts of sodium or calcium such as calcium oxide, calcium carbonate, slaked lime, sodium sulfate, etc.
  • the melting point thereof may be between l,500 and l,700 C. In order to be able to remove the silicon dioxide in fused condition, it is necessary to lower the melting point thereof, because such temperatures are destructive to the walls of the incinerator and, in addition, difficult to achieve.
  • the incinerator When the dried slurry with or without added alkaline materials is jetted into the interior of the incinerator which has been pre-heated to l,200 C or above, ignition of organic materials occurs immediately, since the ignition temperature of such organic matter is generally no higher than 500 C.
  • the feed to the incinerator generally contains no more than about 1 percent of water. Consequently, it is generally possible to reach a temperature as high as l,300 C or higher without the addition of auxiliary fuel.
  • the amount of slurry and air should be adjusted so that the exhaust gases leaving the incinerator contain no more than 5 percent of residual oxygen on a volume basis.
  • the combustion products and the ash formed in the incinerator 6 leave same through a flue 9 positioned proximate the bottom of incinerator 6.
  • the flue 9 slopes downwardly and has an opening 10 at the lowest point thereof through which the molten ash may be dropped into'a tank 11 containing water kept in motion by an agitator 12. Alternatively, the molten ash may be dropped on to a cooled surface (not shown) and allowed to solidify in the form of blocks or a cake.
  • the hot gases are lead by flue 9 to duct 14 and thereby into dryer 2.
  • a sensor for determining oxygen content of the flue gas may be inserted, or, alternatively, 13 may be an opening through which flue gas samples can be removed for analysis as to oxygen content.
  • blower 7 and injector 15 can be separately or simultaneously adjusted to keep the oxygen content of the flue gas at or below 5 percent by volume.
  • the salt or oxide used to depress the melting point of the silica present in the slurry may be added to the stream of dried material leaving dryer 2 and approaching storage tank 3, as indicated by the arrow bearing the reference numeral 17.
  • the added oxide or salt can be introduced directly into tank 3 as indicated by the dashed line.
  • FIG. 2 An arrangement designed for this purpose is shown in FIG. 2 where incinerator 6 is indicated schematically together with a waste heat boiler 19 wherein the flue gases passing through flue 9 generate steam which enters indirect dryer 18 through conduit 20. Cooled flue gas leaves boiler 19 through stack 21.
  • the drying chamber in this case provides for indirect drying, namely, the flue gas or steam passes through the interior of rotary disc heat exchanger 18, but it should be noted that steam generated by flue gas can also be used for direct drying.
  • steam generated by flue gas can also be used for direct drying.
  • the improved performance obtained from the indirect dryer system when a dryer of the direct heating type was employed, about 1.4m (approximately 1.9kg) of non-condensible exhaust gas was produced per kilogram of steam.
  • a dryer of the indirect heating type when a dryer of the indirect heating type was substituted, only 0.05m (approximately 0.07kg) of exhaust gas was generated per kilogram of steam.
  • the exhaust gas from either direct or indirect drying was virtually odorless.
  • the incinerator 6 was a vertical cylinder measuring 560mm in internal diameter and 1,500mm in internal height.
  • the incinerator was thermally insulated to decrease heat radiation.
  • the incinerator 6 had been pre-heated to somewhat above l,200 C by use of preheating burner 8. As soon as the feed of slurry started, the use of the preheating burner 8 became unnecessary because the internal temperature of the incinerator quickly reached l,300 C and levelled off between l,300 and 1,350 C. Combustion of the slurry took place as the slurry was in transit from the top of the incinerator to the bottom. Subsequent to incineration, exhaust gases and fused ash flowed out of the incinerator 6 through flue 9. The fused ash flowed through opening 10 dropwise into tank 11 disposed below opening 10. The fused ash solidified to form granules having a diameter between 2 and 3 mm.
  • the purpose of the agitator is to improve heat transfer and to avoid local generation of steam which can be violent.
  • agitation of the water in the tank 11 is not necessary when incineration is carried out on so small a scale as in the present example. For a large scale operation, a trough with water flowing therethrough would be preferable.
  • exhaust gas was sampled through sampling hole 13 and based on the analysis of the flue gas the rate of feed of secondary air from blower 7 was adjusted to maintain the oxygen content of the flue gas at 5 percent or less. As is evident, control of the blower can be made automatic.
  • the hot flue gas was passed through drying chamber 2 to remove water from the wet cake.
  • the hot flue gas be used to generate steam in a heat exchanger and that the drying be carried out by means of the steam, the rotary disc type 18 shown in PK]. 2 being particularly suitable for the purpose.
  • auxiliary fuel may be necessary when the operation is carried out on a small scale.
  • the ratio of surface to volume in the incinerator is so much smaller than in the present case that auxiliary burner 8 is needed only for preheating.
  • a process for the incineration of slurry containing organic matter comprising the steps of passing incoming slurry through a drying chamber, burning said dried slurry in dispersed condition to an ash in an incinerator, the temperature of combustion being controlled to be above the melting point of the ash formed during said incineration, passing the hot combustion gases and molten ash from said incinerator through a downwardly sloping common flue connected to said incinerator proximate the bottom thereof, said fluid having a lowest region, separating said ash in molten condition from the -hot combustion gases at said lowest region and transferring the heat from said hot combustion gases to incoming slurry in said drying chamber.
  • An apparatus for incineration of slurry containing organic matter and ash-forming components comprising a dryer for decreasing the moisture content of said slurry, an incinerator capable of operating at temperatures above the melting point of ash formed in said incinerator, means for conveying said slurry to said incinerator, a flue at the bottom of said incinerator for downwardly-leading hot combustion exhaust gas and molten slag toward said dryer for drying incoming slurry, said flue having a lowest region and an opening at said lowest region for separating fused ash from said hot combustion exhaust gas.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Organic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Gasification And Melting Of Waste (AREA)
US378721A 1973-05-07 1973-07-12 Process for incinerating slurry and apparatus therefor Expired - Lifetime US3858535A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
GB2166073A GB1426389A (en) 1973-05-07 1973-05-07 Process for incinerating slurry
FR7316781A FR2237127B1 (en, 2012) 1973-05-07 1973-05-09
NL7306478A NL7306478A (en, 2012) 1973-05-07 1973-05-09
CH658373A CH555786A (de) 1973-05-07 1973-05-09 Verfahren zur verbrennung von organische bestandteile enthaltendem schlamm.
CA170,908A CA978032A (en) 1973-05-07 1973-05-10 Process for incinerating slurry
US378721A US3858535A (en) 1973-05-07 1973-07-12 Process for incinerating slurry and apparatus therefor

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
GB2166073A GB1426389A (en) 1973-05-07 1973-05-07 Process for incinerating slurry
FR7316781A FR2237127B1 (en, 2012) 1973-05-07 1973-05-09
NL7306478A NL7306478A (en, 2012) 1973-05-07 1973-05-09
CH658373A CH555786A (de) 1973-05-07 1973-05-09 Verfahren zur verbrennung von organische bestandteile enthaltendem schlamm.
CA170,908A CA978032A (en) 1973-05-07 1973-05-10 Process for incinerating slurry
US378721A US3858535A (en) 1973-05-07 1973-07-12 Process for incinerating slurry and apparatus therefor

Publications (1)

Publication Number Publication Date
US3858535A true US3858535A (en) 1975-01-07

Family

ID=27543252

Family Applications (1)

Application Number Title Priority Date Filing Date
US378721A Expired - Lifetime US3858535A (en) 1973-05-07 1973-07-12 Process for incinerating slurry and apparatus therefor

Country Status (6)

Country Link
US (1) US3858535A (en, 2012)
CA (1) CA978032A (en, 2012)
CH (1) CH555786A (en, 2012)
FR (1) FR2237127B1 (en, 2012)
GB (1) GB1426389A (en, 2012)
NL (1) NL7306478A (en, 2012)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4292742A (en) * 1978-06-21 1981-10-06 Stal-Laval Turbin Ab Plant for drying fuel
US4354825A (en) * 1981-02-20 1982-10-19 Mcnally Pittsburg Mfg. Corp. Method and apparatus for drying coal
US4444129A (en) * 1982-11-05 1984-04-24 Lecorp Method of drying fine coal particles
US4532873A (en) * 1982-05-12 1985-08-06 Weyerhaeuser Company Suspension firing of hog fuel, other biomass or peat
EP0541009A1 (en) * 1991-11-06 1993-05-12 VOMM IMPIANTI E PROCESSI S.r.L. Method for eliminating pollutants from gas produced during substrate drying
EP0613867A1 (en) * 1993-02-26 1994-09-07 F.L. Smidth & Co. A/S Method for manufacturing a pozzolanic material from paper sludge
JP2013043178A (ja) * 2011-08-26 2013-03-04 Mitsubishi Materials Techno Corp 含水被処理物処理システムおよび含水被処理物処理方法
CN118287479A (zh) * 2024-04-01 2024-07-05 浙江大学 一种废活性炭基混合有机浆料灰熔点调控方法

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5272365A (en) * 1975-12-15 1977-06-16 Nittetsu Kakoki Kk Method of treating fermentation waste water
DE2729277A1 (de) * 1977-06-29 1979-01-04 Saarberg Fernwaerme Gmbh Verfahren zur behandlung von schlaemmen oder aschen, insbesondere von klaerschlamm oder klaerschlammaschen
DE2753537C2 (de) * 1977-12-01 1980-01-10 Saarberg-Fernwaerme Gmbh, 6600 Saarbruecken Verfahren zur thermischen Behandlung von wäßrigen Schlämmen, insbesondere von Klärschlämmen \
DE2951620A1 (de) * 1979-12-21 1981-07-02 Thomas Schäfer Verfahren und vorrichtung zur verwertung von muell und/oder abwasserschlamm
DE3907457C2 (de) * 1989-03-08 1997-01-16 Metallgesellschaft Ag Verfahren zur Abscheidung flüssiger Asche
DE4016468A1 (de) * 1990-05-22 1991-11-28 Passavant Werke Verfahren und anlage zur thermischen entsorgung von klaerschlaemmen
DE4103463C2 (de) * 1991-02-06 1995-06-01 Babcock Anlagen Gmbh Verfahren zum Verbrennen von getrocknetem Klärschlamm
FI104712B (sv) * 1996-04-03 2000-03-31 Conox Oy Förfarande för oxidering av avloppsvatten innehållande organiska ämnen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3141426A (en) * 1961-06-05 1964-07-21 Module Incinerators Inc Incinerator
US3367769A (en) * 1965-07-22 1968-02-06 Clarence C. Schott Method and apparatus for continuously melting scrap vehicles
US3521581A (en) * 1968-02-23 1970-07-21 Stein & Roubaix Installation for burning sewage sludges
US3552333A (en) * 1968-07-08 1971-01-05 Von Roll Ag Process for the concomitant incineration of solid refuse and of aqueous sewage sludge
US3697256A (en) * 1971-02-08 1972-10-10 Isaiah B Engle Method of incinerating refuse

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2151079A (en) * 1935-02-05 1939-03-21 Bowen William Spencer Sewage disposal system
US2537467A (en) * 1946-05-28 1951-01-09 Komline Sanderson Eng Corp Apparatus for burning waste material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3141426A (en) * 1961-06-05 1964-07-21 Module Incinerators Inc Incinerator
US3367769A (en) * 1965-07-22 1968-02-06 Clarence C. Schott Method and apparatus for continuously melting scrap vehicles
US3521581A (en) * 1968-02-23 1970-07-21 Stein & Roubaix Installation for burning sewage sludges
US3552333A (en) * 1968-07-08 1971-01-05 Von Roll Ag Process for the concomitant incineration of solid refuse and of aqueous sewage sludge
US3697256A (en) * 1971-02-08 1972-10-10 Isaiah B Engle Method of incinerating refuse

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4292742A (en) * 1978-06-21 1981-10-06 Stal-Laval Turbin Ab Plant for drying fuel
US4354825A (en) * 1981-02-20 1982-10-19 Mcnally Pittsburg Mfg. Corp. Method and apparatus for drying coal
US4532873A (en) * 1982-05-12 1985-08-06 Weyerhaeuser Company Suspension firing of hog fuel, other biomass or peat
US4444129A (en) * 1982-11-05 1984-04-24 Lecorp Method of drying fine coal particles
EP0541009A1 (en) * 1991-11-06 1993-05-12 VOMM IMPIANTI E PROCESSI S.r.L. Method for eliminating pollutants from gas produced during substrate drying
EP0613867A1 (en) * 1993-02-26 1994-09-07 F.L. Smidth & Co. A/S Method for manufacturing a pozzolanic material from paper sludge
JP2013043178A (ja) * 2011-08-26 2013-03-04 Mitsubishi Materials Techno Corp 含水被処理物処理システムおよび含水被処理物処理方法
CN118287479A (zh) * 2024-04-01 2024-07-05 浙江大学 一种废活性炭基混合有机浆料灰熔点调控方法

Also Published As

Publication number Publication date
FR2237127B1 (en, 2012) 1976-04-23
GB1426389A (en) 1976-02-25
FR2237127A1 (en, 2012) 1975-02-07
NL7306478A (en, 2012) 1974-11-12
CA978032A (en) 1975-11-18
CH555786A (de) 1974-11-15

Similar Documents

Publication Publication Date Title
US3858535A (en) Process for incinerating slurry and apparatus therefor
RU2138730C1 (ru) Способ и устройство для газификации горючего материала в топке с флюидизированной подушкой
US5349910A (en) Method and apparatus for incinerating waste in a cement kiln plant
US4583468A (en) Method and apparatus for combustion of diverse materials and heat utilization
CA1085069A (en) Incineration of lime-conditioned sewage sludge with high sulfur fuel
CN105948459A (zh) 一种污泥干化焚烧处置方法
JPH08510985A (ja) セメントクリンカー製造方法及び製造プラント装置
US6883444B2 (en) Processes and systems for using biomineral by-products as a fuel and for NOx removal at coal burning power plants
CN104692603A (zh) 污泥集成处理系统
RU2142098C1 (ru) Превращение шлама с бумажных фабрик или подобных материалов
US4168670A (en) Incineration of lime-conditioned sewage sludge with high sulfur fuel
US4724777A (en) Apparatus for combustion of diverse materials and heat utilization
JP4625265B2 (ja) 流動層装置における硫黄分の除去方法及び脱硫剤
US3559596A (en) Method and apparatus for incinerating sludge
RU2249766C2 (ru) Способ сжигания твердых бытовых и прочих органических отходов и устройство для его осуществления
US4854861A (en) Process for calcining limestone
EP0126619B1 (en) Improvements in and relating to a method and apparatus for combustion of materials
JPS6152883B2 (en, 2012)
JPS6053805B2 (ja) 可燃性汚泥の処理方法
JPS6042368B2 (ja) 下水汚泥の資源回収装置
JPH0212324B2 (en, 2012)
JPH02157509A (ja) 汚泥の焼却・溶融処理方法および焼却・溶融炉
JP2010008040A (ja) 流動層装置における硫黄分の除去方法及び脱硫剤
JPS5844720B2 (ja) オイルスラツジ処理方法
JPS55129492A (en) Preparation of solid fuel from industrial waste