WO2009013581A2 - Unit for reducing pollutants in the exhaust gases of internal combustion machines - Google Patents

Unit for reducing pollutants in the exhaust gases of internal combustion machines Download PDF

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Publication number
WO2009013581A2
WO2009013581A2 PCT/IB2008/001848 IB2008001848W WO2009013581A2 WO 2009013581 A2 WO2009013581 A2 WO 2009013581A2 IB 2008001848 W IB2008001848 W IB 2008001848W WO 2009013581 A2 WO2009013581 A2 WO 2009013581A2
Authority
WO
WIPO (PCT)
Prior art keywords
unit
fluidized bed
reducing pollutants
bed combustor
exhaust gases
Prior art date
Application number
PCT/IB2008/001848
Other languages
French (fr)
Other versions
WO2009013581A3 (en
Inventor
Tullio Caselli
Ibrahim Gulyurtlu
Original Assignee
Shap S.P.A. Solar Heat And Power
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 Shap S.P.A. Solar Heat And Power filed Critical Shap S.P.A. Solar Heat And Power
Publication of WO2009013581A2 publication Critical patent/WO2009013581A2/en
Publication of WO2009013581A3 publication Critical patent/WO2009013581A3/en

Links

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
    • F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/04—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids
    • 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
    • F23G5/30—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a fluidised bed
    • 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
    • F23G5/44—Details; Accessories
    • F23G5/46—Recuperation of heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J7/00—Arrangement of devices for supplying chemicals to fire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2067—Urea
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/40—Alkaline earth metal or magnesium compounds
    • B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/404—Nitrogen oxides other than dinitrogen oxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/01—Engine exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/10—Nitrogen; Compounds thereof
    • F23J2215/101—Nitrous oxide (N2O)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/20—Sulfur; Compounds thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/40—Carbon monoxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2219/00—Treatment devices
    • F23J2219/20—Non-catalytic reduction devices
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/12—Heat utilisation in combustion or incineration of waste
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to a unit for reducing pollutants in the exhaust gases of internal combustion machines .
  • the object of the present invention is to provide a method for reducing pollutants in the exhaust gases of internal combustion machines, whose technical specifications are suitable to allow introduction thereof in an energy production plant .
  • the subject of the present invention is a unit for reducing pollutants in the exhaust gases of internal combustion machines; said unit being characterized in that it comprises a fluidized bed combustor; an exhaust gas conduction line suitable to supply said fluidized bed combustor with the exhaust gases coming from one or more internal combustion machines; a fuel supply line for the fluidized bed combustor; said fuel being suitable to produce inside said fluidized bed combustor a quantity of carbon and of ammonia suitable to react with the nitrogen oxides to cause reduction thereof to molecular nitrogen.
  • the unit of the present invention comprises means to feed calcium carbonate into the fuel to produce oxidation of the sulphur dioxide to calcium sulphate .
  • the unit of the present invention comprises means to utilize the heat generated by combustion in the combustor to produce steam or to heat diathermic oil to supply a steam turbine or organic turbine cycle .
  • the exhaust gases are fed into the fluidized bed combustor as fluidization air.
  • the plant 1 in substance comprises one or more internal combustion machines 2 (only one is represented in the figure for simplicity) , for example diesel engines and/or gas turbines, one or more electric generators 3 connected to respective internal combustion machines 2, a unit for reducing pollutants 4, a water/steam blow-by line 5, a vaporizer 6, means to heat the water/steam 7, and a turbine 8 connected to a current generator 9 and operated by the steam produced.
  • the unit for reducing pollutants 4 comprises a fluidized bed combustor 10, a line 11 to conduct exhaust gases from the internal combustion machines 2 to the fluidized bed combustor
  • the fuel with which the fluidized bed combustor 10 is supplied can either be biomass or RDF (Refuse Derived Fuel) , and must be able to produce inside the fluidized bed combustor 10 a quantity of carbon and of ammonia suitable to reduce nitrogen oxides to molecular nitrogen and carbon monoxide to carbon dioxide according to the reactions indicated below:
  • a quantity of calcium carbonate is added to the fuel to allow reduction of the sulphur dioxide to take place inside the combustor according to the reactions indicated below:
  • CaCO 3 CaO + CO 2
  • the unit of the present invention must comprise a tank for the calcium carbonate, a gauge and a mixer.
  • the fluidized bed combustor presents a series of combustion characteristics suitable to ensure low emissions and, therefore, a low environmental impact.
  • the advantageous characteristics specific to fluidized bed combustion relate to an enormous surface for combustion and heat exchange due to the turbulence generated by the fluidized bed, good contact between oxidizing air and fuel due to the intense mixing generated in the fluidized bed, high thermal capacity of the bed of sand in relation to the quantity of fuel supplied, and excellent combustion of the effluents due to the free space above the bed in which combustion of the gases generated during the process is completed.
  • heavy oil, propane or natural gas can be used as ignition fuel
  • the sand can be of the siliceous river sand type, uncrushed and dry with an average grain size of 0.32 mm.
  • the exhaust gases coming from the internal combustion machines 2 are fed into the fluidized bed combustor 10 at a portion below an air distribution plate 18 thereof and are used as fluidization air.
  • the fluidized bed combustor 10 raises the temperature of the exhaust gases to a value of around 1000 0 C, promoting reduction of the nitrogen oxides to molecular nitrogen, oxidation of the sulphur dioxide to calcium sulphate and oxidation of the carbon monoxide to carbon dioxide according to the reactions indicated above .
  • the unit 4 comprises a system 19 to supply urea to the fluidized bed combustor 10.
  • the urea supply system 19 is composed of a urea tank 20 and of a supply line 21.
  • urea decomposes into ammonia, which reacts with the nitrogen oxides in the presence of oxygen to produce molecular nitrogen and water.
  • the vaporizer 6 is housed above a combustion chamber 22 of fluidized bed combustor 10, and is connected to a water/steam tank 23 from which to pick up the water and in which to deposit the steam produced.
  • the means to heat the water/steam 7 comprise an economizer 24 and a superheater 25, both operating with the exhaust gas supplied from the fluidized bed combustor 10 by means of a connection with the discharge line 17.
  • the economizer 24 takes the water to a temperature close to boiling point
  • the superheater 25 takes the steam coming from the water/steam tank 23 to a rated temperature.
  • the discharge line 17 comprises a group of cyclone filters 26 and, besides cooperating with the economizer 24 and the superheater 25, as indicated above and shown in the figure, it is connected to the secondary air supply system 15 through a heat exchanger 27. Finally, the discharge line 17 terminates with disposal means 28 known and not described in detail.
  • the water/steam blow-by line 5 comprises a condenser 29 and a water treatment unit 30 shown schematically and disposed in sequence downstream of the turbine 10.
  • the unit for reducing pollutants 4 of the present invention besides ensuring reduction of nitrogen oxides and therefore preventing their emission into the atmosphere, also participates in the production of electrical energy by the turbine 8 through transfer of heat to the vaporizer 6 and to the water/steam heating means 7.
  • the exhaust gases coming from the fluidized bed combustor 10 are emitted into the atmosphere after being treated by the disposal means 28 which allows particulate to be reduced well below the legal limits.
  • the unit for reducing pollutants of the present invention besides being integrated in an energy production plant as indicated above purely by way of example, can also be applied in different contexts in which it is necessary to prevent the nitrogen oxides present in the exhaust gases of internal combustion machines from being emitted into the atmosphere.

Abstract

A unit for reducing pollutants (4) in the exhaust gases of internal combustion machines (2) composed of a fluidized bed combustor (10); an exhaust gas transfer line (11) suitable to supply the fluid bed combustor (10) with the exhaust gases coming from one or more internal combustion machines (2); and a fuel supply line (12) for the fluidized bed combustor (10). The fuel must be suitable to produce inside the fluidized bed combustor (10) a quantity of carbon and of ammonia suitable to react with the nitrogen oxides to cause reduction thereof to molecular nitrogen.

Description

"UNIT FOR REDUCING POLLUTANTS IN THE EXHAUST GASES OF INTERNAL COMBUSTION MACHINES"
TECHNICAL FIELD
The present invention relates to a unit for reducing pollutants in the exhaust gases of internal combustion machines .
BACKGROUND ART
The problem relative to pollution is today one of the priorities that the industrialized world has to deal with. In particular, there is the need to ensure that energy production plants have a low environmental impact .
In this regard, it must be considered that the use of both large and small electrical power plants is currently widespread in the various industrial basins, especially in districts without sufficient access to large distribution networks and the problem concerning the treatment of their atmospheric emissions has become a subject on the agenda, in particular in places in which very strict limits are in force. In fact, plants for producing electrical energy imply a significant environmental impact and, as it is known, it is more difficult to check the emissions of a large number of plants scattered over the territory than of one large power plant .
The majority of these plants operate using large diesel engines, or gas turbines with combined cycles, the exhaust gases of which usually contain higher levels of particulate, carbon monoxide, sulphur dioxides and nitrogen oxides than the permitted limits .
Reduction of these pollutants by means of specific devices implies a further cost for the plant without any advantage from the viewpoint of energy production. In fact, the use of specific catalysts is particularly costly both due to the high costs of these catalysts and due to the fact that they are subject to poisoning.
DISCLOSURE OF INVENTION
The object of the present invention is to provide a method for reducing pollutants in the exhaust gases of internal combustion machines, whose technical specifications are suitable to allow introduction thereof in an energy production plant .
The subject of the present invention is a unit for reducing pollutants in the exhaust gases of internal combustion machines; said unit being characterized in that it comprises a fluidized bed combustor; an exhaust gas conduction line suitable to supply said fluidized bed combustor with the exhaust gases coming from one or more internal combustion machines; a fuel supply line for the fluidized bed combustor; said fuel being suitable to produce inside said fluidized bed combustor a quantity of carbon and of ammonia suitable to react with the nitrogen oxides to cause reduction thereof to molecular nitrogen.
According to a preferred embodiment, the unit of the present invention comprises means to feed calcium carbonate into the fuel to produce oxidation of the sulphur dioxide to calcium sulphate .
According to a preferred embodiment, the unit of the present invention comprises means to utilize the heat generated by combustion in the combustor to produce steam or to heat diathermic oil to supply a steam turbine or organic turbine cycle .
According to a preferred embodiment of the unit of the present invention, the exhaust gases are fed into the fluidized bed combustor as fluidization air.
BRIEF DESCRIPTION OF THE DRAWING The example below is provided purely as a non-limiting example in order to understand the invention better with the aid of the figure of the accompanying drawing, which shows a schematic form of the unit of the present invention inside an energy production plant.
BEST MODE FOR CARRYING OUT THE INVENTION
In the figure, the plant of the present invention is indicated as a whole with 1.
The plant 1 in substance comprises one or more internal combustion machines 2 (only one is represented in the figure for simplicity) , for example diesel engines and/or gas turbines, one or more electric generators 3 connected to respective internal combustion machines 2, a unit for reducing pollutants 4, a water/steam blow-by line 5, a vaporizer 6, means to heat the water/steam 7, and a turbine 8 connected to a current generator 9 and operated by the steam produced.
The unit for reducing pollutants 4 comprises a fluidized bed combustor 10, a line 11 to conduct exhaust gases from the internal combustion machines 2 to the fluidized bed combustor
10, a line 12 to supply fuel to the fluidized bed combustor
10, a fuel tank 13, a combustion air supply system 14, a secondary air supply system 15, an ash collection system 16 and a line 17 to discharge the exhaust gases coming from the fluidized bed combustor 10.
The fuel with which the fluidized bed combustor 10 is supplied can either be biomass or RDF (Refuse Derived Fuel) , and must be able to produce inside the fluidized bed combustor 10 a quantity of carbon and of ammonia suitable to reduce nitrogen oxides to molecular nitrogen and carbon monoxide to carbon dioxide according to the reactions indicated below:
(reduction of carbon monoxide) 2CO + O2 - 2CO2
2CO + 2NO «- 2CO2 +N2
(reduction of nitrogen oxides)
2N0 + C «→ N2 + CO2; and
4NH3 + 4N0 + O2 ~ 4N2+ 6H2O
According to a preferred embodiment, a quantity of calcium carbonate is added to the fuel to allow reduction of the sulphur dioxide to take place inside the combustor according to the reactions indicated below:
(reduction of sulphur dioxide)
CaCO3 = CaO + CO2
CaO + 1/2 O2 + SO2 = CaSO4
To allow a specific quantity of calcium carbonate to be added to the fuel, the unit of the present invention must comprise a tank for the calcium carbonate, a gauge and a mixer.
As is known to those skilled in the art, the fluidized bed combustor presents a series of combustion characteristics suitable to ensure low emissions and, therefore, a low environmental impact. The advantageous characteristics specific to fluidized bed combustion relate to an enormous surface for combustion and heat exchange due to the turbulence generated by the fluidized bed, good contact between oxidizing air and fuel due to the intense mixing generated in the fluidized bed, high thermal capacity of the bed of sand in relation to the quantity of fuel supplied, and excellent combustion of the effluents due to the free space above the bed in which combustion of the gases generated during the process is completed. In particular, heavy oil, propane or natural gas can be used as ignition fuel, while the sand can be of the siliceous river sand type, uncrushed and dry with an average grain size of 0.32 mm.
In particular, the exhaust gases coming from the internal combustion machines 2 are fed into the fluidized bed combustor 10 at a portion below an air distribution plate 18 thereof and are used as fluidization air. The fluidized bed combustor 10 raises the temperature of the exhaust gases to a value of around 10000C, promoting reduction of the nitrogen oxides to molecular nitrogen, oxidation of the sulphur dioxide to calcium sulphate and oxidation of the carbon monoxide to carbon dioxide according to the reactions indicated above .
In order to ensure complete reduction of the nitrogen oxides inside the fluidized bed combustor 10, according to a particular embodiment the unit 4 comprises a system 19 to supply urea to the fluidized bed combustor 10. In particular, the urea supply system 19 is composed of a urea tank 20 and of a supply line 21. As is known to those skilled in the art, at high temperatures urea decomposes into ammonia, which reacts with the nitrogen oxides in the presence of oxygen to produce molecular nitrogen and water.
More specifically, in the plant shown in the figure, the vaporizer 6 is housed above a combustion chamber 22 of fluidized bed combustor 10, and is connected to a water/steam tank 23 from which to pick up the water and in which to deposit the steam produced.
The means to heat the water/steam 7 comprise an economizer 24 and a superheater 25, both operating with the exhaust gas supplied from the fluidized bed combustor 10 by means of a connection with the discharge line 17. In particular, the economizer 24 takes the water to a temperature close to boiling point, and the superheater 25 takes the steam coming from the water/steam tank 23 to a rated temperature.
The discharge line 17 comprises a group of cyclone filters 26 and, besides cooperating with the economizer 24 and the superheater 25, as indicated above and shown in the figure, it is connected to the secondary air supply system 15 through a heat exchanger 27. Finally, the discharge line 17 terminates with disposal means 28 known and not described in detail.
To complete the indications provided in the figure, the water/steam blow-by line 5 comprises a condenser 29 and a water treatment unit 30 shown schematically and disposed in sequence downstream of the turbine 10.
As will be apparent to those skilled in the art, the unit for reducing pollutants 4 of the present invention, besides ensuring reduction of nitrogen oxides and therefore preventing their emission into the atmosphere, also participates in the production of electrical energy by the turbine 8 through transfer of heat to the vaporizer 6 and to the water/steam heating means 7.
The exhaust gases coming from the fluidized bed combustor 10 are emitted into the atmosphere after being treated by the disposal means 28 which allows particulate to be reduced well below the legal limits.
The unit for reducing pollutants of the present invention, besides being integrated in an energy production plant as indicated above purely by way of example, can also be applied in different contexts in which it is necessary to prevent the nitrogen oxides present in the exhaust gases of internal combustion machines from being emitted into the atmosphere.

Claims

C L A I M S
1. Unit for reducing pollutants (4) in the exhaust gases of internal combustion machines (2) ; said unit being characterized in that it comprises a fluidized bed combustor
(10) ; an exhaust gas transfer line (11) suitable to supply said fluidized bed combustor (10) with the exhaust gases coming from one or more internal combustion machines (2) ; a line (12) to supply fuel to said fluidized bed combustor (10) ,- said fuel being suitable to produce inside said fluidized bed combustor (10) a quantity of carbon and of ammonia suitable to react with the nitrogen oxides to cause reduction thereof to molecular nitrogen.
2. Unit for reducing pollutants as claimed in claim 1, characterized in that it comprises means to supply calcium carbonate to the ~ fuel to produce oxidation of the sulphur dioxide to calcium sulphate.
3. Unit for reducing pollutants as claimed in claims 1 or 2 , characterized in that it comprises means to utilize the heat (6, 23, 25, 24) generated by combustion in the combustor (10) to produce steam or to heat diathermic oil to supply a steam turbine or organic turbine cycle.
4. Unit for reducing pollutants as claimed in one of the preceding claims, characterized in that the exhaust gases are fed into the fluidized bed combustor (10) as fluidization air.
5. Unit for reducing pollutants as claimed in one of the preceding claims, characterized in that said fuel is composed of biomass or RDF.
6. Unit for reducing pollutants as claimed in one of the preceding claims, characterized in that it comprises a system (19) to supply urea to said fluidized bed combustor (10) .
7. Unit for reducing pollutants as claimed in one of the preceding claims, characterized in that said internal combustion machines (2) consist of diesel engines or gas turbines .
8. Energy production plant (1) comprising one or more internal combustions machines (2) connected to respective electrical current generators (9) ; said plant being characterized in that it comprises a unit for reducing pollutants as claimed in one or the preceding claims.
9. Plant as claimed in claim 8, characterized in that it comprises at least one steam turbine (8) connected to a respective electrical current generator (9) and operating by- means of the steam produced through utilization of the heat produced by said fluidized bed combustor (10) .
10. Process for reducing pollutants present in the exhaust gases of internal combustion machines; said process being characterized in that it comprises a redox step wherein the nitrogen oxides present in the exhaust gases of said internal combustion machines (2) are reduced to molecular nitrogen through reaction with carbon or ammonia at a temperature of around 1000°C.
11. Process according to claim 10, characterized in that in said redox step the sulphur dioxide is oxidized to calcium sulphate and the carbon monoxide is oxidized to carbon dioxide.
12. Process for reducing pollutants as claimed in claim 10 or 11, characterized in that said reduction and/or oxidation step takes place inside a fluidized bed combustor (10) .
PCT/IB2008/001848 2007-07-20 2008-07-16 Unit for reducing pollutants in the exhaust gases of internal combustion machines WO2009013581A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000505A ITBO20070505A1 (en) 2007-07-20 2007-07-20 GROUP FOR FILLING THE POLLUTANTS OF EXHAUST GAS OF INTERNAL COMBUSTION MACHINES
ITBO2007A000505 2007-07-20

Publications (2)

Publication Number Publication Date
WO2009013581A2 true WO2009013581A2 (en) 2009-01-29
WO2009013581A3 WO2009013581A3 (en) 2010-01-28

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WO (1) WO2009013581A2 (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3612888A1 (en) * 1986-04-17 1987-10-29 Metallgesellschaft Ag COMBINED GAS / STEAM TURBINE PROCESS
EP0281535A1 (en) * 1987-02-25 1988-09-07 PPS Project Promotion Services AB A heat and power co-generation plant
US4928635A (en) * 1989-07-20 1990-05-29 Mack Shelor Power plant and method of retrofitting existing power plants
EP0508622A1 (en) * 1991-03-18 1992-10-14 Combustion Power Company Inc. Power plant with efficient emission control for obtaining high turbine inlet temperature
WO1993016327A1 (en) * 1992-02-06 1993-08-19 Combustion Power Company, Inc. Emission control fluid bed reactor
DE10039575A1 (en) * 2000-08-12 2002-02-28 Dieter Steinbrecht Method for reducing the amount of pollutants from the exhaust gases of combustion engines running on heavy oil, requires conveying the resultant flue gases over fluidized bed incinerator for steam generation
US6405664B1 (en) * 2001-04-23 2002-06-18 N-Viro International Corporation Processes and systems for using biomineral by-products as a fuel and for NOx removal at coal burning power plants
WO2002093074A1 (en) * 2001-05-11 2002-11-21 Kvaerner Power Oy Combined fluidized bed and pulverized coal combustion method
US20060090678A1 (en) * 2004-08-05 2006-05-04 Kriech Anthony J Reduction of NOx in combustion flue gas

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3612888A1 (en) * 1986-04-17 1987-10-29 Metallgesellschaft Ag COMBINED GAS / STEAM TURBINE PROCESS
EP0281535A1 (en) * 1987-02-25 1988-09-07 PPS Project Promotion Services AB A heat and power co-generation plant
US4928635A (en) * 1989-07-20 1990-05-29 Mack Shelor Power plant and method of retrofitting existing power plants
EP0508622A1 (en) * 1991-03-18 1992-10-14 Combustion Power Company Inc. Power plant with efficient emission control for obtaining high turbine inlet temperature
WO1993016327A1 (en) * 1992-02-06 1993-08-19 Combustion Power Company, Inc. Emission control fluid bed reactor
DE10039575A1 (en) * 2000-08-12 2002-02-28 Dieter Steinbrecht Method for reducing the amount of pollutants from the exhaust gases of combustion engines running on heavy oil, requires conveying the resultant flue gases over fluidized bed incinerator for steam generation
US6405664B1 (en) * 2001-04-23 2002-06-18 N-Viro International Corporation Processes and systems for using biomineral by-products as a fuel and for NOx removal at coal burning power plants
WO2002093074A1 (en) * 2001-05-11 2002-11-21 Kvaerner Power Oy Combined fluidized bed and pulverized coal combustion method
US20060090678A1 (en) * 2004-08-05 2006-05-04 Kriech Anthony J Reduction of NOx in combustion flue gas

Also Published As

Publication number Publication date
ITBO20070505A1 (en) 2009-01-21
WO2009013581A3 (en) 2010-01-28

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