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WO1998013151A1 - Procede et systeme pour traiter des milieux contamines tels que du sol charge de goudron de houille - Google Patents

Procede et systeme pour traiter des milieux contamines tels que du sol charge de goudron de houille Download PDF

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Publication number
WO1998013151A1
WO1998013151A1 PCT/US1997/016834 US9716834W WO9813151A1 WO 1998013151 A1 WO1998013151 A1 WO 1998013151A1 US 9716834 W US9716834 W US 9716834W WO 9813151 A1 WO9813151 A1 WO 9813151A1
Authority
WO
WIPO (PCT)
Prior art keywords
soil
particulate matter
gaseous
separating
contaminated
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.)
Ceased
Application number
PCT/US1997/016834
Other languages
English (en)
Inventor
Thomas F. Mcgowan
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.)
RMT Inc
Original Assignee
RMT Inc
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 RMT Inc filed Critical RMT Inc
Priority to AU47361/97A priority Critical patent/AU4736197A/en
Publication of WO1998013151A1 publication Critical patent/WO1998013151A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00—General arrangement of separating plant, e.g. flow sheets
    • B03B9/02—General arrangement of separating plant, e.g. flow sheets specially adapted for oil-sand, oil-chalk, oil-shales, ozokerite, bitumen, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/06—Reclamation of contaminated soil thermally
    • 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
    • F23G5/006—General arrangement of incineration plant, e.g. flow sheets
    • 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
    • F23G7/14—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of contaminated soil, e.g. by oil
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/006—Layout of treatment plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2201/00—Pretreatment
    • F23G2201/40—Gasification

Definitions

  • the present invention relates to clean up of soil or other media contaminated by manufactured gas plant coal tar, or other organic contaminants such as petroleum products, solvents and chemicals.
  • the invention additionally relates to removal of particulates from the vaporized organic stream prior to oxidizing the vapors in a utility boiler furnace.
  • MGP Manufactured gas plant
  • the present invention involves a system for cleaning contaminated media, such as soil, which utilizes a utility boiler furnace as the control device to destroy coal tar vapors produced in the system.
  • the present process also uses the boiler's air pollution control system, thereby eliminating the capital and operating costs for a secondary combustion chamber, air pollution control system and stack.
  • Another feature of this invention is that it recycles coal tars.
  • the invention recycles the coal tars by utilizing their heat value for steam production in the boiler.
  • the heat from the desorber burners is also available for steam production.
  • This invention also addresses a major deficiency in prior attempts to use utility boilers for treatment of manufactured gas plant waste, in that the inorganic fraction (typically about 90% by weight of contaminated soil) is precluded from entering the boiler furnace. Problems with blockages, slagging, fouling, erosion and the like previously discussed are thus eliminated.
  • the amount of contaminated media that may be processed is not limited by the boiler's bottom ash and fly ash handling capability.
  • Coal is approximately 90% fuel and 10% ash.
  • Contaminated soil is the inverse being approximately 90% ash and 10% contaminants and other volatiles.
  • To burn large quantities of contaminated soil in a standard boiler overwhelms the ability of the ash handling system and air pollution control system to take it back out.
  • the processed soil does not intermingle with coal ash. Therefore, this processed soil can be used for multiple purposes such as road fill, daily cover in land fills and fill for the excavation that the contaminated soil is derived.
  • the present invention thus provides a low cost, method to clean contaminated media, especially soil in connection with utility boiler operation while avoiding problems caused by
  • the present invention provides a method of cleaning media contaminated with organic contaminants, comprising the steps of separating contaminated media into oversized particles and 0 undersized particles; separating the undersized particles into a gaseous fraction containing volatile contaminants and a solid fraction containing treated material; removing particulate matter from said gaseous fraction to form a light gaseous stream and a heavy dust stream; and burning said gaseous fraction.
  • soil or other contaminated media is screened to two inch top size. It then enters a rotary flighted drum where a direct-fired burner with external furnace provides heat in a co- current mode of operation. The soil is heated as it passes
  • the drum vaporizing water and organic material.
  • the vapors After exiting the drum, the vapors pass through one or more cyclones to remove entrained inorganic particulate.
  • the vapors may also pass through a baghouse to provide additional particulate removal.
  • the vapors then enter an induced draft fan which keeps the treatment system under draft and provides the increase in pressure necessary to transport the vapors to the utility boiler furnace.
  • FIG. 1 is a schematic illustration of the MGP coal tar treatment system embodying the present invention.
  • Fig. 1 illustrates an apparatus and method for remediation or cleanup of MGP (manufactured gas plant) coal tar contaminated media.
  • MGP manufactured gas plant
  • media preferably refers to different types of common soil, but may also include wood chips, iron filings, sediments from harbors or rivers, sludges from sewage or other waste byproducts, sand, gravel, clays, and the like, which are typically found at MGP sites and other contaminated sites.
  • the term “media” refers to any type of material having the ability to be contaminated with undesirable organic constituents that also has the ability to be treated to remove the contaminates so that the base material may be recycled or reused.
  • this media is preferably MGP coal tar contaminated soil, and the following description will be directed toward the cleanup or treatment of such soil.
  • the preferred media for use in the system of the present invention is soil contaminated with organic materials such as coal tar which is typically found in MGP (manufactured gas plant) sites.
  • the soil is typically contaminated with coal tar from coal- fueled gas works and is a byproduct of the coal gasification process. Contamination of soil typically occurred from various plant operations, leaks and demolition where coal tar was simply buried with other debris.
  • treatment or cleanup of contaminated soil from MGP sites first begins by excavating the contaminated soil and feeding the contaminated soil via line 1 to a hopper or bin 2.
  • hopper 2 From hopper 2 the raw soil is metered onto a conveyer 3 which in turn feeds the soil at a constant rate to an inclined conveyor 4 which uniformly distributes the soil to a screening apparatus, preferably a shaker screen 5.
  • Screen 5 separates the contaminated soil into oversized particles and undersized particles.
  • the oversized particles are those materials greater than approximately 2 inches in diameter and the undersized particles are those typically less than about 2 inches in diameter.
  • the oversized particles are fed via line 6 to a conveyor 7 which in turn feeds the oversized particles via line 8 to be crushed and recycled to shaker screen 5.
  • the oversized particles could be cleaned mechanically, or washed in a soil washing process.
  • screening of contaminated soil can be more than the above mentioned 2 inch particle size if the material handling system hereinafter to be described is designed to accommodate the larger size particles. However, particles of 2 inches or less in diameter may be accommodated by standard equipment designs, and is therefore preferred.
  • the undersized particles from screen 5 are fed via line 9 to a constant speed belt 10.
  • Belt 10 receives the contaminated undersized particles from screen 5 and monitors tonnage flow to the system while feeding the undersized particles to the thermal treatment stage of the process.
  • Contaminated soil typically includes 0-4% coal tars by weight with most contaminated soil averaging 1 -2% coal tar by weight. Contaminated soil is thus fed to a rotary desorber 11 from belt 10 via line 12 and chute 13.
  • Desorber 11 is a well- known device which is sized and rotated at a suitable speed for the volume of material to be processed.
  • desorber 1 1 is a co-current, direct fired, rotating flighted drum which, as shown in Fig. 1 uses an external furnace 14 and burner 15 to prevent the flame from direct contact with soil to thereby preclude quenching of the flame.
  • Desorber 1 1 heats the contaminated soil to a temperature sufficient to cause water and organic contaminates from coal tar contained in the soil to vaporize into a gas leaving a treated solid soil material.
  • soil temperatures typically of between 600°F and 900°F are achieved, but soil temperatures of up to 1000°F and as low as 450°F are possible if desired.
  • Desorber 11 may be co-current or counter- current in operation, but is preferably co-current to avoid the possible condensation of coal tar in the cyclones, the baghouse or in the baghouse fines which may occur with counter-current designs.
  • rotary desorber 1 1 may be replaced by a retort, paddle dryer and/or hollow flight augers with hot oil or molten salts pumped through the shafts and jackets thereof.
  • a retort, paddle dryer and/or hollow flight augers with hot oil or molten salts pumped through the shafts and jackets thereof.
  • Each of these devices are well known in the art and function to separate the undersized particles in the contaminated soil into a gaseous fraction containing volatile organic contaminates and a soil fraction containing treated material.
  • Coal tar and other high boiling point organics can be removed at temperatures between 600°F and 900°F with appropriate residence time. As a result, virtually all organics can be removed from the soil to produce treated material having organic contaminants below a one part per million level.
  • the soil matrix is a major factor in setting the required temperature.
  • contaminated soil entering desorber 1 1 contains preferably anywhere from 0-4% concentration of MGP coal tars and due to the thermal treatment within desorber 11 the undersized contaminated soil particles are separated into a gaseous fraction containing volatile MGP coal tar contaminates which exit desorber 1 1 via line 16, and a solid fraction containing substantially clean treated soil which exits desorber 1 1 via line 17.
  • this method with certain modifications, will work with any percentage of contamination including pure coal tar.
  • the solid fraction in line 17 is then fed to a cooler 18 which typically comprises a low RPM auger.
  • Cooler 18 may also be a pugmill, rotary drum, or other device depending upon the soil matrix or other treated material being fed to it. Cooler 18 reduces the overall temperature of the treated soil from between 600°F-900°F, which is the temperature of the soil exiting desorber 1 1 , to approximately 200°F or less. This is accomplished by spraying water via line 19 to cool and consolidate the treated soil. Cooled, treated soil exits cooler 18 via line 20 and may be recovered for multiple purposes such as road fill, cover in land fills and other construction soil fill.
  • the gaseous fraction leaving desorber 11 via line 16 contains substantially all of the MGP coal tars driven off of the contaminated soil and forms a light gaseous stream which needs to be further processed to remove particulate matter therefrom.
  • the typical composition of MGP coal tar gaseous fraction contained in line 16 is as follows:
  • Methylphenanthrenes 3.0 354-355 Major Components of MGP Coal Tar Gas Fraction
  • cyclone dust collector 21 is a well-known device which centrifugally separates the particulate matter from the gaseous fraction in a known manner to create a light gaseous stream which exits cyclone 21 via line 22 and a heavy dust stream which exits cyclone 21 via line 23.
  • the volatile gasses in light gaseous stream 22 may optionally further be processed to remove additional particulate matter by being fed to a filter, typically a bag filter contained in baghouse 24, downstream of cyclone 21.
  • the bag filters in baghouse 24 further separate particulate matter from the gaseous fraction and provides a light gaseous stream 25 exiting therefrom which is substantially clean ofx all particulate matter, and a heavy dust stream which exits baghouse 24 via line 26.
  • the heavy dust stream 23 from cyclone 21 and the heavy dust stream 26 from baghouse 24 may
  • the light gaseous stream 25 from baghouse 24 enters the inlet of an induced draft fan 27 which in turn feeds the volatile organic gasses to a boiler furnace via line 28 where the coal tar gasses are destroyed.
  • the heat value of the volatile organic gases is thus being utilized to produce steam in the boiler.
  • Fan 27 also functions to reduce the presser in lines 16, 22 and 25 to aid in separating the undersized particles into gaseous and solid fractions in desorber 1 1 and to aid in removing particulate matter in cyclone 21 and baghouse 24, as is well known in the art. Also, it may be necessary to maintain the gas streams 16 and 22 above a predetermined temperature in order to prevent condensation of organic volatiles in the filter bags contained within baghouse 24. In order to accomplish this, lines 16 and 22 are typically insulated from the surrounding ambient air. However, it may be necessary to use heat tracing on lines 16 and/or 22 depending upon the circumstances and other factors well-known by those skilled in the art. Preferably, the temperature in lines 16 and 22 should be maintained at 600°F- 900°F.
  • MGP coal tar separation and cycling system has been illustrated and described which permits the separation of MGP coal tar contaminants from soil or other media to enable both the volatile coal tar contaminants as well as the clean soil to be recycled and /or reused.
  • control interlocks prevent system operation when the utility boiler is not in normal service.
  • the gasses produced in the process can be fed to a steel mill blast furnace or cupola as alternatives to the utility boiler furnace.
  • the coal tars can be from sources other than manufactured gas plant sites such as coke ovens and wood treating sites.
  • the contaminates in the soil may also contain organics other than manufactured gas plant coal tars.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Soil Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Geology (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

Procédé permettant de nettoyer du sol contaminé ou d'autres milieux contaminés par du goudron de houille provenant d'installations de gaz manufacturé, ou par d'autres contaminants organiques tels que des produits pétroliers, des solvants et des produits chimiques. On chauffe le sol ou l'autre milieu, ce qui vaporise le contaminant organique. On fait passer la vapeur au travers des dispositifs (21, 24) qui enlèvent les matières particulaires, puis on l'oxyde dans le foyer d'une chaudière polyvalente.
PCT/US1997/016834 1996-09-27 1997-09-24 Procede et systeme pour traiter des milieux contamines tels que du sol charge de goudron de houille Ceased WO1998013151A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU47361/97A AU4736197A (en) 1996-09-27 1997-09-24 Method and system for the treatment of contaminated media as eg coal tar loaded soil

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US72401696A 1996-09-27 1996-09-27
US08/724,016 1996-09-27

Publications (1)

Publication Number Publication Date
WO1998013151A1 true WO1998013151A1 (fr) 1998-04-02

Family

ID=24908616

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/016834 Ceased WO1998013151A1 (fr) 1996-09-27 1997-09-24 Procede et systeme pour traiter des milieux contamines tels que du sol charge de goudron de houille

Country Status (2)

Country Link
AU (1) AU4736197A (fr)
WO (1) WO1998013151A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1181487B1 (fr) * 2000-03-24 2018-10-03 Wisconsin Electric Power Company Procédé de récupération de produits de combustion du charbon

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3447079A1 (de) * 1984-08-28 1986-03-06 Carl Still Gmbh & Co Kg, 4350 Recklinghausen Verfahren zur thermischen behandlung verunreinigter erde
US4827854A (en) * 1988-05-16 1989-05-09 Collette Jerry R Reflux volatilization system
US5170726A (en) * 1991-11-18 1992-12-15 Thermotech Systems Corporation Apparatus and methods for remediating materials contaminated with hydrocarbons
US5205674A (en) * 1990-08-16 1993-04-27 Charles C. Chisholm Soil decontamination method
US5305886A (en) * 1992-01-28 1994-04-26 General Electric Company Decontamination process
EP0614710A1 (fr) * 1993-02-10 1994-09-14 Metallgesellschaft Aktiengesellschaft Procédé pour la séparation thermique de substances organiques et/ou inorganiques d'un matière contaminée
US5534158A (en) * 1993-12-21 1996-07-09 Envirotech Consulting Inc. Method for clean-up of soils or refuse materials contaminated with highly viscous coal or petroleum derived tars/oils

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3447079A1 (de) * 1984-08-28 1986-03-06 Carl Still Gmbh & Co Kg, 4350 Recklinghausen Verfahren zur thermischen behandlung verunreinigter erde
US4827854A (en) * 1988-05-16 1989-05-09 Collette Jerry R Reflux volatilization system
US5205674A (en) * 1990-08-16 1993-04-27 Charles C. Chisholm Soil decontamination method
US5170726A (en) * 1991-11-18 1992-12-15 Thermotech Systems Corporation Apparatus and methods for remediating materials contaminated with hydrocarbons
US5305886A (en) * 1992-01-28 1994-04-26 General Electric Company Decontamination process
EP0614710A1 (fr) * 1993-02-10 1994-09-14 Metallgesellschaft Aktiengesellschaft Procédé pour la séparation thermique de substances organiques et/ou inorganiques d'un matière contaminée
US5534158A (en) * 1993-12-21 1996-07-09 Envirotech Consulting Inc. Method for clean-up of soils or refuse materials contaminated with highly viscous coal or petroleum derived tars/oils

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1181487B1 (fr) * 2000-03-24 2018-10-03 Wisconsin Electric Power Company Procédé de récupération de produits de combustion du charbon

Also Published As

Publication number Publication date
AU4736197A (en) 1998-04-17

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