US20060269886A1 - Radiant combustion reactor - Google Patents
Radiant combustion reactor Download PDFInfo
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- US20060269886A1 US20060269886A1 US11/433,640 US43364006A US2006269886A1 US 20060269886 A1 US20060269886 A1 US 20060269886A1 US 43364006 A US43364006 A US 43364006A US 2006269886 A1 US2006269886 A1 US 2006269886A1
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- 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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- 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
- B01D53/34—Chemical or biological purification of waste gases
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- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
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- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
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- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
- F01N13/0093—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are of the same type
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- 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
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
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- 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
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
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- 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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0892—Electric or magnetic treatment, e.g. dissociation of noxious components
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- 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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/26—Construction of thermal reactors
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- 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
- F23G5/50—Control or safety arrangements
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- 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
- F23G7/061—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
- F23G7/063—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating electric heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/002—Gaseous fuel
- F23K5/007—Details
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- 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
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/02—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a heat exchanger
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- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2202/00—Combustion
- F23G2202/10—Combustion in two or more stages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/10—Waste heat recuperation reintroducing the heat in the same process, e.g. for predrying
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2900/00—Special features of, or arrangements for incinerators
- F23G2900/50213—Preheating processes other than drying or pyrolysis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2217/00—Intercepting solids
- F23J2217/10—Intercepting solids by filters
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- 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 generally relates to the field of combustion processes, and more particularly to combustion processes ignited by radiant heat (also referred to as radiant combustion processes). More specifically, the invention relates to a radiant combustion reactor for the use in radiant combustion processes.
- radiant combustion is a process of combustion of a substance that is ignited by a heat source not involving the presence of a flame, but irradiating the substance, e.g. a gas or a mix of gases, to be combusted to electromagnetic radiating energy, particularly in the range of range of wavelengths from InfraRed (IR) to UltraViolet (UV).
- a heat source not involving the presence of a flame
- irradiating the substance e.g. a gas or a mix of gases
- Radiant combustion is carried out within apparatuses known as radiant combustion reactors.
- a radiant combustion reactor consists of an enclosure within which the substance(s) to be combusted are fed.
- the enclosure walls which are made of suitable materials, are heating means adapted to heat the enclosure walls up to a temperature at which the material making up the enclosure walls starts radiating electromagnetic radiation (in the way that approximates the black-body radiation), in a range of wavelengths and with an energy sufficient to cause the heating of the substance(s) to be combusted.
- the radiated energy is sufficiently high, the substance(s) to be combusted is heated up to a temperature sufficient to ignite the combustion thereof.
- the combustion reactors typically take the form of tubes (also referred to as radiant tubes) of suitable material, within which the substance(s) to be combusted, typically gases, are caused to flow.
- the heating means are associated with the tubes and cause heating thereof, so that the gases flowing therethrough are also heated up to the desired temperature.
- Typical heating means used in radiant combustion reactors are based on the Joule effect, and comprise electrical resistors, for example spiral resistors wound around radiant tubes, or embedded in heat-radiating panels between which the radiant tubes are sandwiched.
- an optical radiation source is used as a heating means for a radiant combustion reactor, particularly a highly coherent, monochromatic and intense radiation such as a laser radiation.
- the radiant combustion reactor comprises a combustion chamber delimited by walls which, when properly heated, radiate electromagnetic energy, particularly in a wavelength range from infrared to ultraviolet; a heating arrangement is operatively associated with the heat-radiating walls for heating the walls up to a prescribed, radiating temperature.
- the heating arrangement comprises at least one optical radiation source generating an optical radiation that is caused to invest the heat-radiating walls and is adapted to cause heating thereof.
- optical radiation is not to be construed strictly as meaning an electromagnetic radiation in a wavelength range such as to be visible by the human's eye, but more broadly, to include for example infrared radiation.
- FIG. 1 is a schematic diagram showing, partly in terms of functional blocks, an apparatus exploiting a radiant combustion reactor according to an embodiment of the present invention
- FIG. 2 depicts quite schematically a radiant combustion reactor according to an embodiment of the present invention, used in the apparatus of FIG. 1 ;
- FIG. 3 schematically shows, in axonometric view, a first possible implementation of the radiant combustion reactor of FIG. 2 , in an embodiment of the present invention
- FIG. 4 schematically shows, in axonometric view, a second possible implementation of the radiant combustion reactor of FIG. 2 , in another embodiment of the present invention
- FIG. 5 shows rather schematically, in axonometric view, a third possible implementation of the radiant combustion reactor of FIG. 2 , in still another embodiment of the present invention
- FIGS. 6A, 6B and 6 C schematically shows, in axonometric view and in cross-section, a fourth possible implementation of the radiant combustion reactor of FIG. 2 , in an embodiment of the present invention
- FIG. 7 schematically shows, in axonometric view, a fifth possible implementation of the radiant combustion reactor of FIG. 2 , in an embodiment of the present invention.
- FIG. 8 schematically shows, in axonometric view, a sixth possible implementation of the radiant combustion reactor of FIG. 2 , in still another embodiment of the present invention.
- FIG. 1 a schematic diagram is provided showing, partly in terms of functional blocks, an apparatus implementing a process of reduction of combustion residues, particularly for reducing pollutants such as carbon oxide (CO), carbon dioxide (CO 2 ), uncombusted hydrocarbons (HC), various nitrogen oxides (NO x ); and Particulate Matter (PM), in particular carbon particulate, normally present in exhaust gases generated by apparatuses whose operation involves the combustion of a fuel, and in which a radiant combustion reactor according to an embodiment of the present invention can be used.
- pollutants such as carbon oxide (CO), carbon dioxide (CO 2 ), uncombusted hydrocarbons (HC), various nitrogen oxides (NO x ); and Particulate Matter (PM), in particular carbon particulate, normally present in exhaust gases generated by apparatuses whose operation involves the combustion of a fuel, and in which a radiant combustion reactor according to an embodiment of the present invention can be used.
- pollutants such as carbon oxide (CO), carbon dioxide (CO 2 ), uncombusted hydrocarbons (HC), various nitrogen oxides (NO
- the pollutants-reduction apparatus denoted globally as 100 , is schematically depicted as placed downstream a block 105 , representative of a generic apparatus of any type whose operation involves the combustion of fuels, particularly fossil fuels such as hydrocarbon fuels or hydrocarbon containing fuels such as petroleum, including natural gas, coal, or wood and the like, in general any fuel that can be combusted; for example, the apparatus 105 may be an internal-combustion engine of a vehicle, particularly but not limitatively of the Diesel type, or a burner of a heating system for buildings.
- a block 110 is provided, schematically representing an exhaust system of any conventional type, for example a simple muffler of a vehicle.
- the pollutants-reduction apparatus 100 has an input manifold 115 i , for receiving combustion exhaust gases from the apparatus 105 ; the received exhaust gases are treated by the apparatus 100 before being released in the environment; the pollutants-reduction apparatus 100 has an output manifold 1150 for delivering treated exhaust gases to the exhaust system 110 (it is however observed that the exhaust system 110 might also not be provided for, and the treated exhaust gases be released directly into the environment).
- the input manifold 115 i leads the exhaust gases to be treated to a gases pre-heating chamber 120 , where the exhaust gases, received from the apparatus 105 at a relatively low temperature, are submitted to a preliminary heating process.
- the temperature of the exhaust gases should in theory be around 400-450° C.; however, experimental trials conducted by the Applicant have revealed that the exhaust gases temperature is normally lower, falling in the range from approximately 150° C. to approximately 300° C.
- the preliminary heating process in the pre-heating chamber 120 brings the exhaust gases temperature to a suitably high value, preferably a value higher than 400° C., for example a value in the range from approximately 400° C. to 700° C. and, preferably, from approximately 550° C. or 600° C. to approximately 700° C.
- the pre-heating chamber 120 comprises means adapted to submit the incoming exhaust gases to a compression, thereby the gases temperature rises.
- the pre-heating chamber 120 may comprise means adapted to imparting a suitable acceleration to the exhaust gases, and particularly one or more among a fan (or an arrangement of fans), a turbine (or an arrangement of turbines), a turbocompressor; these elements are schematically indicated in FIG. 1 , and identified therein by 121 .
- the acceleration imparted to the exhaust gases is preferably such that the gas temperature is raised to approximately 500° C.-600° C.
- a Venturi tube (schematically represented in FIG. 1 and identified therein as 123 ) is provided, for further compressing the exhaust gases and thus causing a further increase of the temperature thereof, for example up to a temperature of approximately 700° C.
- the pre-heated gases are conveyed to a radiant combustion reactor 125 , situated just downstream the Venturi tube 123 .
- the radiant combustion reactor 125 comprises an enclosure or chamber with walls made of suitable material, which are heated by a heat source to a prescribed temperature, thereby the chamber walls radiate electromagnetic energy within the chamber (in the way that approximate the black-body radiation).
- the temperature of the exhaust gases is raised further and rather quickly from the pre-heating temperature, for example the initial approximately 700° C., to a temperature in the range from approximately 900° C. to approximately 1200° C., preferably from approximately 900° C.
- the upper limit of the temperature of the exhaust gases is determined by the requirement that, at such a temperature, the creation of nitrogen oxides is not relevant; thus, the maximum temperature of the gases within the combustion reactor 125 may reach 1300-1400° C.
- the increase in temperature is achieved by radiant energy, particularly in the wavelength range from IR to UV, radiating from the walls of the radiant combustion reactor 125 .
- the exhaust gases post-combustion process that is automatically induced allows substantially reducing or even eliminating the harmful, uncombusted particulates present in the exhaust gases.
- the exhaust gases typically a mix of oxygen, uncombusted hydrocarbons, carbon particulate, self-combustion is automatically ignited, because the gaseous fluid in the reactor 125 travels in an environment at a temperature which is higher than the self-combustion temperature (the specific value of which depend on the substances present in the exhaust gases), and the combustion is carried out exploiting the radiant energy irradiating from the walls of the reactor 125 .
- This substantially improves the efficiency of the combustion of the carbon particulates, which is more difficult than that of hydrocarbons because the combustion time is related exponentially to the size and shape of the particle.
- the gas temperature in the radiant combustion reactor 125 is sufficiently high, in particular higher than approximately 450° C., preferably in the range from approximately 900° C. to approximately 1200° C., and more preferably from approximately 900° C. to approximately 1100° C., i.e. below the temperature at which nitride oxides start forming, nitride oxides already present in the exhaust gases are reduced.
- the post-combustion process of the exhaust gases may be combined with known reduction processes, such as the Non-Selective Catalytic Reduction (NSCR) process, in presence of oxygen (by providing a suitable feed of oxygen to the radiant combustion reactor), or the Selective Catalytic Reduction (SCR) process, in presence of a noble catalyst (e.g., platinum), maintained at high temperature by the flow of the exhaust gases.
- NSCR Non-Selective Catalytic Reduction
- SCR Selective Catalytic Reduction
- a noble catalyst e.g., platinum
- the radiant combustion reactor 125 is shown very schematically and it is depicted as a substantially “C”-shaped duct; it is pointed out that this is not to be intended as a limitation to the present invention; in the following of the present description, the radiant combustion reactor 125 will be described in greater detail, and several possible embodiments thereof will be presented and discussed.
- the structure of the radiant combustion reactor 125 shall be such that it is ensured that the exhaust gases are submitted to the radiating energy for a time sufficient to reach the desired temperature, for example a temperature in the above-mentioned temperature range, adapted to induce the post-combustion of the pollutants.
- the radiant combustion reactor 125 is preferably thermally insulated, for example by means of refractory silicon-ceramic materials, or other suitable materials.
- a first filtering element 130 a is arranged along the radiant combustion reactor 125 (for example, the radiant combustion reactor 125 may be made up of two parts in cascade, and the filtering element 130 a may be arranged between the first and the second part).
- Each one or both of the filtering elements 130 a and 130 b may comprise active filters, particularly selective filters, preferably active nanofilters in ceramic/zeolite material, and are used for trapping residual dust and Particulate Material (hereinafter, shortly, PM) still present in the exhaust gases after the post-combustion process in the radiant combustion reactor 125 .
- the first filtering element 130 a if provided, allows trapping the residual, uncombusted dust and PM present in the exhaust gases after a first post-combustion phase
- the second filtering element 130 b positioned at the output of the radiant combustion reactor 125 , serves for trapping the uncombusted dust and PM still remaining in the exhaust gases after the post-combustion.
- the filtering elements may act both as hot catalysts, and as pure filters,
- the specific arrangement, the number and the dimensions of the nanofilters making up the filtering elements 130 a and 130 b will depend on the specific type of apparatus 105 to which the pollutant-reduction apparatus 100 is intended to be associated with. However, as a general rule, nanofilters resistant to high temperatures should be used.
- the filtering elements 130 a and 130 b are removable from the apparatus 100 and, even more preferably, they are also reconditionable or recyclable.
- means suitable to favor the exit of the post-combusted gases from the radiant combustion reactor 125 are provided, as shown in phantom and indicated by 127 in FIG. 1 ; for example, such means may comprise another Venturi tube, or any other device capable of determining a depression downstream the reactor 125 .
- the treated exhaust gases After being passed through the second filtering element 130 b , the treated exhaust gases (substantially freed of the harmful pollutants) are led to a heat exchange arrangement 135 .
- the temperature of the treated exhaust gases is lowered from the 900° C.-1200° C. to values suitable to avoid thermal shocks, such as a temperature value of approximately 100° C.-150° C.
- the heat exchange arrangement 135 is arranged in such a way that at least part of the heat released by the treated exhaust gases is exploited for pre-heating the incoming gases to be treated in the pre-heating chamber 120 , thereby alleviating the burden of the exhaust gases acceleration means.
- the heat exchange arrangement 135 is made of materials resistant to high temperatures, particularly sodium, lithium, titanium, etc), and it may be of the molded metal type, of the liquid metal type, of the plate type, of the spiral type; in case the apparatus 100 is intended to be installed on a vehicle, the heat exchanger shall have a compact design.
- the treated exhaust gases, from which the harmful pollutants have been substantially eliminated are led to the output manifold 1150 , and then to the exhaust system 110 (for example, the muffler of the vehicle).
- a control unit 140 is provided in the apparatus 100 for controlling the various components thereof (as schematized by the dash-and-dot lines in the drawing).
- the control unit 140 comprises electronic control means, preferably programmable, particularly microprocessor-based control means, adapted to execute suitable microprograms for implementing a predefined control flow, and sensors, such as pressure sensors and temperature sensors for detecting the operating temperature in the different parts of the apparatus 100 , such as the pre-heating chamber 120 , the radiant combustion reactor 125 , the heat exchange arrangement 135 .
- control unit 140 The specific controls operated by the control unit 140 depend largely on the structure of the radiant combustion reactor 125 , but in general the control unit 140 shall at least ensure that a correct temperature is maintained within the reactor 125 .
- FIG. 2 shows schematically a radiant combustion reactor 125 according to an embodiment of the present invention, exploiting as a heating means optical radiation generated by a suitable optical radiation source, particularly a highly coherent, monochromatic, intense optical radiation of the type generated by a laser.
- Lasers are more and more widely exploited in several applications, either in industry and in consumer products, thanks to the fact that the emitted optical radiation is highly coherent, substantially monochromatic, very homogenous, intense and concentrated, and that they have a very fast response.
- the radiant combustion chamber 125 comprises a radiant combustion reactor enclosure 1000 ; the spatial configuration of the radiant combustion reactor enclosure is not limitative to the present invention, depending for example on the specific application: thus, in FIG. 2 the radiant combustion reactor 1000 is schematically depicted as generically elliptical.
- the radiant combustion reactor enclosure 1000 has walls 1005 made of suitable material, for example INCONEL steel, a composite material having a ceramic matrix, or special alloys, adapted to radiate heat when properly heated, and receives thereinside the exhaust gases to be treated (in general, any substance to be submitted to radiant combustion).
- the optical radiation emitted by the laser(s) 1020 controlled by the control unit 140 , is reflected/deflected by the optical radiation reflecting/deflecting elements 1010 , and hits the external side of the walls of the radiant combustion reactor 1000 , causing a substantially uniform heating thereof.
- the walls of the radiant combustion reactor are brought to the radiative temperature, i.e. to a temperature such that a sufficient electromagnetic energy, in the prescribed range of wavelengths (approximately from infrared to ultraviolet) is radiated from the walls of the radiant combustion reactor into the enclosure 1000 .
- radiant combustion reactor 125 exploiting the optical-based heating mechanism, particularly the laser-based heating, will be presented, being intended that such embodiments are merely exemplary and not at all limitative.
- the radiant combustion reactor 125 comprises a lined radiant tube 1200 having an inner hollow body 1200 a surrounded by an outer hollow body 1200 b (both of which depicted as transparent, for the sake of clarity), and wherein the exhaust gases (more generally, the substance to be submitted to radiant combustion) are made to pass in the space 1203 between the inner and the outer hollow bodies, whilst a laser(s) 1220 is arranged inside the inner hollow body 1200 a , and the latter preferably has reflecting walls, adapted to reflect the laser radiation. Also in this case, the laser 1220 is schematically depicted as movable along the axis of the inner hollow body 1200 a , and the laser 1220 might also be rotatable about the hollow body axis.
- FIG. 5 shows quite schematically a still different embodiment of the radiant combustion reactor 125 , comprising a reaction chamber in the form of a hollow body 1300 having a substantially spherical shape, within which the exhaust gases to be treated (the substances to be submitted to radiant combustion) are conveyed.
- the laser(s) 1320 is arranged externally to the spherical reaction chamber, and is for example movable so as to hit different areas of the surface thereof.
- the laser(s) is associated to moving means suitable to cause the laser to revolve around the reaction chamber, so that the laser radiation hits different points of the chamber external surface and causes a substantially uniform heating thereof.
- the substantially spherical shape of the radiant combustion reactor 125 in the embodiment of FIG. 5 allows achieving a high effectiveness in the heating of the exhaust gases conveyed thereinto.
- the incoming exhaust gases at a lower temperature, force the gases already undergone to the post-combustion process to leave the combustion chamber.
- an optical radiation reflecting/deflecting arrangement may also in this case be provided for.
- the use of lasers thus allows reducing the operation costs of the radiant combustion reactor and of the apparatus including it.
- the lasers used, and their optical power, may vary depending on contingent needs, according to the specific applications.
- the laser(s) may be operated in Continuous Wave (CW) mode or, preferably, in pulsed mode.
- the laser(s) may be of rotating type, or a laser(s) emitting multiple beams properly out of phase.
- a suitable number of sensors may be associated with the walls of the radiant combustion reactor such as to enable the control unit 140 to cause the laser radiation hit the desired areas of the radiant combustion reactor walls, scanning the surface according to prescribed patterns in such a way as to cause the surface be homogeneously hit by the optical radiation.
- a specific control software may be executed by the control unit 140 , according to which the surface to be hit by the laser radiation is subdivided according to several different parameters, such as the temperature of the areas already hit by the optical radiation, the difference in temperature between these areas and those not yet hit (the cold areas), the target temperature.
- a dynamic temperature map can thus be built, and such a temperature map, in addition to being used by the control unit to control the laser(s) (and the positioning thereof), might also be displayed, on suitable display devices, to an operator, so as to enable constantly control the operation of the apparatus.
- the control software may be based on variation calculations or on perturbation calculation, or on a simpler “fork shoot” (a term derived from the navy jargon and indicating a successive approximation process).
- the control software in conjunction with the reflecting/deflecting arrangement, may allow to hit in a substantially random manner different areas of the walls of the radiant combustion reactor.
- the use of laser(s) allows a better controllability of the whole radiant combustion process.
- the pulsed laser(s) by properly driving the pulsed laser(s) through the suitably programmed control unit, the post-combustion process of the exhaust gases can be controlled finely in dependence of the density of the exhaust gases and their velocity, which in turn depend on the engine's RPMs and on the engine operating temperature.
- FIGS. 6A, 6B and 6 C, in FIG. 7 and in FIG. 8 relate to radiant combustion reactors within which movable means are provided for propelling the gases during the post-combustion process, and/or for varying the internal geometry of the radiant combustion chamber during operation, particularly by determining a dynamic partition of the radiant combustion chamber.
- FIGS. 6A, 6B and 6 C there is schematically shown, in axonometric and cross-sectional views, a substantially cylindrical, hollow radiant combustion reactor 1400 with a tri-lobe rotor 1405 (depicted as transparent, for the sake of clarity) rotatably inserted therein, constituted by a generically cylindrical body coaxial to the reactor 1400 and having lobes 1405 a , 1405 b , 1405 c angularly spaced of approximately 120° from each other; the rotor 1405 may have different possible cross-sectional areas, as in the two examples shown in the cross-sectional views of FIGS. 6B and 6C .
- a suitable drive arrangement is also provided, not shown in the drawings, for causing the rotor 1405 to rotate about its axis inside the radiant combustion reactor during the operation.
- the exhaust gases to be treated are conveyed into the combustion chamber through an inlet 1410 i ; within the chamber, the rotation of the rotor 1405 causes a dynamic partition of the internal space of the chamber into three dynamically-varying portions, and facilitates the flow of the gases towards an outlet 1410 o or 1400 o ′; while flowing from the inlet to the outlet, the gases undergoes a post-combustion process due to the radiant energy that is irradiated by the walls of the radiant combustion reactor, heated by the laser radiation.
- a rotor 1505 constituted by an endless screw is rotatably arranged within and extends coaxially to the cylindrical, hollow radiant combustion reactor 1400 (depicted again as transparent, for clarity); again, a suitable drive arrangement, not shown in the drawing, is provided for rotating the rotor 1505 about its axis.
- the cross-sectional shape of the rotor can vary so as to vary the internal volume of the post-combustion chamber, in dependence of the specific application.
- the efficiency of the radiant combustion reactor heating by the laser radiation pulses may be optimized.
- a discontinuous or intermittent post-combustion process is instead one in which the post-combustion chamber is loaded with gases, then the chamber is closed, the post-combustion process is carried out, the chamber is opened to discharge the treated gases, and then the process is re-started.
- the radiant combustion reactor may be a mix of the solutions presented in the foregoing.
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Abstract
A radiant combustion reactor comprises a combustion chamber delimited by walls adapted to radiate electromagnetic radiation in a prescribed wavelength range, and a heating arrangement operatively associated with the radiating walls for heating the radiating walls to a prescribed, radiating temperature. The heating arrangement comprises at least one optical radiation source generating an optical radiation that is caused to invest the radiating walls and causes heating thereof.
Description
- This is a continuation-in-part application which claims priority from PCT/EP2003/51115, published in English, filed Dec. 30, 2003, which claims priority from Italian patent Application No. M12003A002179, filed Nov. 12, 2003, which are incorporated herein by reference.
- The present invention generally relates to the field of combustion processes, and more particularly to combustion processes ignited by radiant heat (also referred to as radiant combustion processes). More specifically, the invention relates to a radiant combustion reactor for the use in radiant combustion processes.
- As known in the art, radiant combustion is a process of combustion of a substance that is ignited by a heat source not involving the presence of a flame, but irradiating the substance, e.g. a gas or a mix of gases, to be combusted to electromagnetic radiating energy, particularly in the range of range of wavelengths from InfraRed (IR) to UltraViolet (UV).
- Radiant combustion is carried out within apparatuses known as radiant combustion reactors.
- In very general terms, a radiant combustion reactor consists of an enclosure within which the substance(s) to be combusted are fed. Associated with the enclosure walls, which are made of suitable materials, are heating means adapted to heat the enclosure walls up to a temperature at which the material making up the enclosure walls starts radiating electromagnetic radiation (in the way that approximates the black-body radiation), in a range of wavelengths and with an energy sufficient to cause the heating of the substance(s) to be combusted. Provided the radiated energy is sufficiently high, the substance(s) to be combusted is heated up to a temperature sufficient to ignite the combustion thereof. The combustion reactors typically take the form of tubes (also referred to as radiant tubes) of suitable material, within which the substance(s) to be combusted, typically gases, are caused to flow. The heating means are associated with the tubes and cause heating thereof, so that the gases flowing therethrough are also heated up to the desired temperature.
- Typical heating means used in radiant combustion reactors are based on the Joule effect, and comprise electrical resistors, for example spiral resistors wound around radiant tubes, or embedded in heat-radiating panels between which the radiant tubes are sandwiched.
- Other known heating means are based on the combustion (meaning a classical combustion, in presence of a flame) of gases.
- It has been observed that the known heating means exploited in radiant combustion reactors are disadvantageous under many respects, being slow, power-consuming and (at least in the case of heating means based on the combustion of gases) polluting and possibly critic from the safety viewpoint.
- In view of the state of the art briefly outlined in the foregoing, it is desired to provide a radiant combustion reactor that is not affected by the above-mentioned problems.
- It has been found that significant advantages can be achieved if an optical radiation source is used as a heating means for a radiant combustion reactor, particularly a highly coherent, monochromatic and intense radiation such as a laser radiation.
- In summary, the radiant combustion reactor comprises a combustion chamber delimited by walls which, when properly heated, radiate electromagnetic energy, particularly in a wavelength range from infrared to ultraviolet; a heating arrangement is operatively associated with the heat-radiating walls for heating the walls up to a prescribed, radiating temperature.
- The heating arrangement comprises at least one optical radiation source generating an optical radiation that is caused to invest the heat-radiating walls and is adapted to cause heating thereof.
- It is observed that, for the purposes of the present invention, optical radiation is not to be construed strictly as meaning an electromagnetic radiation in a wavelength range such as to be visible by the human's eye, but more broadly, to include for example infrared radiation.
- Features and advantages of the present invention will be made apparent by the following detailed description of some embodiments thereof, provided merely by way of non-limitative examples, description that will be conducted making reference to the annexed drawings, wherein:
-
FIG. 1 is a schematic diagram showing, partly in terms of functional blocks, an apparatus exploiting a radiant combustion reactor according to an embodiment of the present invention; -
FIG. 2 depicts quite schematically a radiant combustion reactor according to an embodiment of the present invention, used in the apparatus ofFIG. 1 ; -
FIG. 3 schematically shows, in axonometric view, a first possible implementation of the radiant combustion reactor ofFIG. 2 , in an embodiment of the present invention; -
FIG. 4 schematically shows, in axonometric view, a second possible implementation of the radiant combustion reactor ofFIG. 2 , in another embodiment of the present invention; -
FIG. 5 shows rather schematically, in axonometric view, a third possible implementation of the radiant combustion reactor ofFIG. 2 , in still another embodiment of the present invention; -
FIGS. 6A, 6B and 6C schematically shows, in axonometric view and in cross-section, a fourth possible implementation of the radiant combustion reactor ofFIG. 2 , in an embodiment of the present invention; -
FIG. 7 schematically shows, in axonometric view, a fifth possible implementation of the radiant combustion reactor ofFIG. 2 , in an embodiment of the present invention; and -
FIG. 8 schematically shows, in axonometric view, a sixth possible implementation of the radiant combustion reactor ofFIG. 2 , in still another embodiment of the present invention. - Hereinafter the present invention will be described in detail making reference to a particular application thereof, being intended that the invention can be applied in general to other and very different contexts.
- With reference to the drawings, in
FIG. 1 a schematic diagram is provided showing, partly in terms of functional blocks, an apparatus implementing a process of reduction of combustion residues, particularly for reducing pollutants such as carbon oxide (CO), carbon dioxide (CO2), uncombusted hydrocarbons (HC), various nitrogen oxides (NOx); and Particulate Matter (PM), in particular carbon particulate, normally present in exhaust gases generated by apparatuses whose operation involves the combustion of a fuel, and in which a radiant combustion reactor according to an embodiment of the present invention can be used. - The pollutants-reduction apparatus, denoted globally as 100, is schematically depicted as placed downstream a
block 105, representative of a generic apparatus of any type whose operation involves the combustion of fuels, particularly fossil fuels such as hydrocarbon fuels or hydrocarbon containing fuels such as petroleum, including natural gas, coal, or wood and the like, in general any fuel that can be combusted; for example, theapparatus 105 may be an internal-combustion engine of a vehicle, particularly but not limitatively of the Diesel type, or a burner of a heating system for buildings. Downstream the pollutants-reduction apparatus 100, ablock 110 is provided, schematically representing an exhaust system of any conventional type, for example a simple muffler of a vehicle. - In greater detail, the pollutants-
reduction apparatus 100 has aninput manifold 115 i, for receiving combustion exhaust gases from theapparatus 105; the received exhaust gases are treated by theapparatus 100 before being released in the environment; the pollutants-reduction apparatus 100 has anoutput manifold 1150 for delivering treated exhaust gases to the exhaust system 110 (it is however observed that theexhaust system 110 might also not be provided for, and the treated exhaust gases be released directly into the environment). - The
input manifold 115 i leads the exhaust gases to be treated to a gases pre-heatingchamber 120, where the exhaust gases, received from theapparatus 105 at a relatively low temperature, are submitted to a preliminary heating process. Considering for example the case of exhaust gases from an internal combustion engine, particularly of the Diesel type, the temperature of the exhaust gases should in theory be around 400-450° C.; however, experimental trials conducted by the Applicant have revealed that the exhaust gases temperature is normally lower, falling in the range from approximately 150° C. to approximately 300° C. The preliminary heating process in thepre-heating chamber 120 brings the exhaust gases temperature to a suitably high value, preferably a value higher than 400° C., for example a value in the range from approximately 400° C. to 700° C. and, preferably, from approximately 550° C. or 600° C. to approximately 700° C. - The
pre-heating chamber 120 comprises means adapted to submit the incoming exhaust gases to a compression, thereby the gases temperature rises. In particular, thepre-heating chamber 120 may comprise means adapted to imparting a suitable acceleration to the exhaust gases, and particularly one or more among a fan (or an arrangement of fans), a turbine (or an arrangement of turbines), a turbocompressor; these elements are schematically indicated inFIG. 1 , and identified therein by 121. The acceleration imparted to the exhaust gases is preferably such that the gas temperature is raised to approximately 500° C.-600° C. - Preferably, downstream the means for accelerating the exhaust gases, a Venturi tube (schematically represented in
FIG. 1 and identified therein as 123) is provided, for further compressing the exhaust gases and thus causing a further increase of the temperature thereof, for example up to a temperature of approximately 700° C. - From the
pre-heating chamber 120, the pre-heated gases are conveyed to aradiant combustion reactor 125, situated just downstream the Venturitube 123. - The
radiant combustion reactor 125 comprises an enclosure or chamber with walls made of suitable material, which are heated by a heat source to a prescribed temperature, thereby the chamber walls radiate electromagnetic energy within the chamber (in the way that approximate the black-body radiation). Within theradiant combustion reactor 125, the temperature of the exhaust gases is raised further and rather quickly from the pre-heating temperature, for example the initial approximately 700° C., to a temperature in the range from approximately 900° C. to approximately 1200° C., preferably from approximately 900° C. to approximately 1100° C., suitable to determine a combustion (post-combustion) of the exhaust gases; more generally, the upper limit of the temperature of the exhaust gases is determined by the requirement that, at such a temperature, the creation of nitrogen oxides is not relevant; thus, the maximum temperature of the gases within thecombustion reactor 125 may reach 1300-1400° C. The increase in temperature is achieved by radiant energy, particularly in the wavelength range from IR to UV, radiating from the walls of theradiant combustion reactor 125. - By subjecting the exhaust gases to such a fast increase in temperature, the exhaust gases post-combustion process that is automatically induced allows substantially reducing or even eliminating the harmful, uncombusted particulates present in the exhaust gases. In particular, in the exhaust gases, typically a mix of oxygen, uncombusted hydrocarbons, carbon particulate, self-combustion is automatically ignited, because the gaseous fluid in the
reactor 125 travels in an environment at a temperature which is higher than the self-combustion temperature (the specific value of which depend on the substances present in the exhaust gases), and the combustion is carried out exploiting the radiant energy irradiating from the walls of thereactor 125. This substantially improves the efficiency of the combustion of the carbon particulates, which is more difficult than that of hydrocarbons because the combustion time is related exponentially to the size and shape of the particle. - It is observed that by ensuring that the gas temperature in the
radiant combustion reactor 125 is sufficiently high, in particular higher than approximately 450° C., preferably in the range from approximately 900° C. to approximately 1200° C., and more preferably from approximately 900° C. to approximately 1100° C., i.e. below the temperature at which nitride oxides start forming, nitride oxides already present in the exhaust gases are reduced. To this purposes, the post-combustion process of the exhaust gases may be combined with known reduction processes, such as the Non-Selective Catalytic Reduction (NSCR) process, in presence of oxygen (by providing a suitable feed of oxygen to the radiant combustion reactor), or the Selective Catalytic Reduction (SCR) process, in presence of a noble catalyst (e.g., platinum), maintained at high temperature by the flow of the exhaust gases. It is pointed out that the NSCR and the SCR processes may be exploited in alternative to one another, or in combination, depending in particular on the structure, e.g. on the geometry, of theradiant combustion reactor 125. - It is also observed that, in the
radiant combustion reactor 125, the post-combustion of the exhaust gases takes place at a constant pressure. - In
FIG. 1 theradiant combustion reactor 125 is shown very schematically and it is depicted as a substantially “C”-shaped duct; it is pointed out that this is not to be intended as a limitation to the present invention; in the following of the present description, theradiant combustion reactor 125 will be described in greater detail, and several possible embodiments thereof will be presented and discussed. In any case, the structure of theradiant combustion reactor 125, particularly the geometry thereof, shall be such that it is ensured that the exhaust gases are submitted to the radiating energy for a time sufficient to reach the desired temperature, for example a temperature in the above-mentioned temperature range, adapted to induce the post-combustion of the pollutants. - In order to avoid dispersions of energy, the
radiant combustion reactor 125 is preferably thermally insulated, for example by means of refractory silicon-ceramic materials, or other suitable materials. - Optionally, a
first filtering element 130 a is arranged along the radiant combustion reactor 125 (for example, theradiant combustion reactor 125 may be made up of two parts in cascade, and thefiltering element 130 a may be arranged between the first and the second part). - Upon leaving the
radiant combustion reactor 125, the exhaust gases are led to a second filteringelement 130 b. - Each one or both of the
filtering elements radiant combustion reactor 125. In particular, thefirst filtering element 130 a, if provided, allows trapping the residual, uncombusted dust and PM present in the exhaust gases after a first post-combustion phase, while thesecond filtering element 130 b, positioned at the output of theradiant combustion reactor 125, serves for trapping the uncombusted dust and PM still remaining in the exhaust gases after the post-combustion. Depending on the type of nanofilters adopted, the filtering elements may act both as hot catalysts, and as pure filters, - It is pointed out that the specific arrangement, the number and the dimensions of the nanofilters making up the
filtering elements apparatus 105 to which the pollutant-reduction apparatus 100 is intended to be associated with. However, as a general rule, nanofilters resistant to high temperatures should be used. - It is also observed that more than one
intermediate filtering element 130 a may be provided along the radiant combustion reactor. - Preferably, the
filtering elements apparatus 100 and, even more preferably, they are also reconditionable or recyclable. - Optionally, means suitable to favor the exit of the post-combusted gases from the
radiant combustion reactor 125 are provided, as shown in phantom and indicated by 127 inFIG. 1 ; for example, such means may comprise another Venturi tube, or any other device capable of determining a depression downstream thereactor 125. - After being passed through the
second filtering element 130 b, the treated exhaust gases (substantially freed of the harmful pollutants) are led to aheat exchange arrangement 135. In theheat exchange arrangement 135 the temperature of the treated exhaust gases is lowered from the 900° C.-1200° C. to values suitable to avoid thermal shocks, such as a temperature value of approximately 100° C.-150° C. - Expediently, the
heat exchange arrangement 135 is arranged in such a way that at least part of the heat released by the treated exhaust gases is exploited for pre-heating the incoming gases to be treated in thepre-heating chamber 120, thereby alleviating the burden of the exhaust gases acceleration means. - Preferably, the
heat exchange arrangement 135 is made of materials resistant to high temperatures, particularly sodium, lithium, titanium, etc), and it may be of the molded metal type, of the liquid metal type, of the plate type, of the spiral type; in case theapparatus 100 is intended to be installed on a vehicle, the heat exchanger shall have a compact design. - From the
heat exchange arrangement 135, the treated exhaust gases, from which the harmful pollutants have been substantially eliminated, are led to theoutput manifold 1150, and then to the exhaust system 110 (for example, the muffler of the vehicle). - A
control unit 140 is provided in theapparatus 100 for controlling the various components thereof (as schematized by the dash-and-dot lines in the drawing). In particular, thecontrol unit 140 comprises electronic control means, preferably programmable, particularly microprocessor-based control means, adapted to execute suitable microprograms for implementing a predefined control flow, and sensors, such as pressure sensors and temperature sensors for detecting the operating temperature in the different parts of theapparatus 100, such as thepre-heating chamber 120, theradiant combustion reactor 125, theheat exchange arrangement 135. - The specific controls operated by the
control unit 140 depend largely on the structure of theradiant combustion reactor 125, but in general thecontrol unit 140 shall at least ensure that a correct temperature is maintained within thereactor 125. - The Applicant has found that the apparatus described in the foregoing, when used in any system wherein combustion of fuels is provided for, such as for example internal-combustion engines, using Diesel fuel, gasoline, methanol, mix of alcohols, natural gas, LPG, Kerosene, fuel oil, hydrocarbons mixed with water, GECAM, BLUDIESEL, fuel for planes with additives, masut for marine engines, allows eliminating approximately 90% of the carbon monoxide, carbon particulate, uncombusted hydrocarbon (CxHy) from the exhaust gases, and reducing nitrogen oxides (NOx) of up to 90%.
- In the following of the present description, several different embodiments of the
radiant combustion reactor 125 will be presented, being however intended that the list of presented alternatives is not to be intended as exhaustive, and several other embodiments can be devised. It is in fact pointed out that the specific spatial configuration and structure of theradiant combustion reactor 125 may depend on the specific application. -
FIG. 2 shows schematically aradiant combustion reactor 125 according to an embodiment of the present invention, exploiting as a heating means optical radiation generated by a suitable optical radiation source, particularly a highly coherent, monochromatic, intense optical radiation of the type generated by a laser. - Lasers are more and more widely exploited in several applications, either in industry and in consumer products, thanks to the fact that the emitted optical radiation is highly coherent, substantially monochromatic, very homogenous, intense and concentrated, and that they have a very fast response.
- In detail, the
radiant combustion chamber 125 comprises a radiantcombustion reactor enclosure 1000; the spatial configuration of the radiant combustion reactor enclosure is not limitative to the present invention, depending for example on the specific application: thus, inFIG. 2 theradiant combustion reactor 1000 is schematically depicted as generically elliptical. The radiantcombustion reactor enclosure 1000 haswalls 1005 made of suitable material, for example INCONEL steel, a composite material having a ceramic matrix, or special alloys, adapted to radiate heat when properly heated, and receives thereinside the exhaust gases to be treated (in general, any substance to be submitted to radiant combustion). - Outside of and around the radiant
combustion reactor enclosure 1000, an arrangement of optical radiation reflecting/deflectingelements 1010 is provided, such as mirrors and/or optical prisms, schematically depicted in the drawing as the internal faces of walls of a box-shapedcasing 1007 containing theradiant combustion reactor 1000. - The arrangement of optical radiation reflecting/deflecting
elements 1010 reflects/deflectsoptical radiations 1015 which are generated by one or more optical radiation sources, particularly lasers, schematically indicated in the drawing at 1020. It is observed that the number and the arrangement of thelasers 1020 is not limitative to the present invention, depending for example on the shape of the radiantcombustion reactor enclosure 1000; in the drawing, just by way of example, fourlasers 1020 are shown, each one located at a respective corner of thebox 1007; thelasers 1020 may be fixed or movable, for example they can be partially rotated and/or angularly oriented. - The optical radiation emitted by the laser(s) 1020, controlled by the
control unit 140, is reflected/deflected by the optical radiation reflecting/deflectingelements 1010, and hits the external side of the walls of theradiant combustion reactor 1000, causing a substantially uniform heating thereof. In this way, the walls of the radiant combustion reactor are brought to the radiative temperature, i.e. to a temperature such that a sufficient electromagnetic energy, in the prescribed range of wavelengths (approximately from infrared to ultraviolet) is radiated from the walls of the radiant combustion reactor into theenclosure 1000. - In the following, some possible practical embodiments of
radiant combustion reactor 125 exploiting the optical-based heating mechanism, particularly the laser-based heating, will be presented, being intended that such embodiments are merely exemplary and not at all limitative. - In particular, in the embodiment schematically shown in
FIG. 3 theradiant combustion reactor 125 comprises aradiant tube 1100, of suitable material, arranged so as to be traversed by the substance to be submitted to radiant combustion, for example the exhaust gases coming from thepre-heating chamber 120. Outside theradiant tube 1100, alight reflecting arrangement 1105 is provided, schematically depicted as an outer tube, coaxial and coextensive to theradiant tube 1100 and having internal optical radiation (particularly, light) reflecting walls (in the drawing, the outer tube is depicted as transparent, for the sake of clarity). Thelight reflecting tube 1105 reflects thelaser radiation 1110, generated by alaser 1120, onto the external surface of theradiant tube 1100, thereby causing the heating thereof to the required temperature. Thelaser 1120 is shown schematically as moving along the axis of the radiant tube; for example, and as depicted schematically in the drawing, the laser(s) 1120 may be mounted to a carriage. Thelaser 1120 might also be caused to revolve around thetube 1100, particularly as it moves along the axis thereof. - It is observed that in
FIG. 3 (and in the following drawings) a supply of oxygen (O2) and ammonia (NH4) into thetube 1100, i.e., into the radiant combustion reactor, is schematically shown; this supply, which is not essential to the present invention, serves for enabling an NSCR process for reducing nitrogen oxides during the post-combustion of the exhaust gases. - A slightly different arrangement is schematically depicted in
FIG. 4 , wherein theradiant combustion reactor 125 comprises a linedradiant tube 1200 having an innerhollow body 1200 a surrounded by an outerhollow body 1200 b (both of which depicted as transparent, for the sake of clarity), and wherein the exhaust gases (more generally, the substance to be submitted to radiant combustion) are made to pass in thespace 1203 between the inner and the outer hollow bodies, whilst a laser(s) 1220 is arranged inside the innerhollow body 1200 a, and the latter preferably has reflecting walls, adapted to reflect the laser radiation. Also in this case, thelaser 1220 is schematically depicted as movable along the axis of the innerhollow body 1200 a, and thelaser 1220 might also be rotatable about the hollow body axis. -
FIG. 5 shows quite schematically a still different embodiment of theradiant combustion reactor 125, comprising a reaction chamber in the form of a hollow body 1300 having a substantially spherical shape, within which the exhaust gases to be treated (the substances to be submitted to radiant combustion) are conveyed. The laser(s) 1320 is arranged externally to the spherical reaction chamber, and is for example movable so as to hit different areas of the surface thereof. For example, the laser(s) is associated to moving means suitable to cause the laser to revolve around the reaction chamber, so that the laser radiation hits different points of the chamber external surface and causes a substantially uniform heating thereof. - The substantially spherical shape of the
radiant combustion reactor 125 in the embodiment ofFIG. 5 allows achieving a high effectiveness in the heating of the exhaust gases conveyed thereinto. In fact, the incoming exhaust gases, at a lower temperature, force the gases already undergone to the post-combustion process to leave the combustion chamber. Also, albeit not shown in the drawing, an optical radiation reflecting/deflecting arrangement may also in this case be provided for. - It is observed that by properly disaligning the inlet and the outlet of the gases into/from the radiant combustion reactor, a vortex can created inside the combustion chamber that, proximate to the chamber outlet, optimizes the gas recirculation, favoring the exit of the portion at a higher temperature. This is further helped by the
Venturi accelerator 127 that may be placed at the exit of the chamber. - The use of one or more lasers for heating the radiant combustion reactor has the advantage of allowing a substantial reduction in the dimensions of the combustion reactor, because, when turned on, the laser(s) cause the reactor walls to almost instantly reach the desired operating temperature (necessary for inducing self-combustion of the exhaust gases and, in general, of the substances to be combusted), and, similarly, the laser(s) can be turned off almost instantaneously.
- Additionally, using lasers as a heating means for the radiant combustion reactor involves a lower power consumption than using Joule-effect heaters such as electrical resistors, because only relatively high peak energies are required.
- Compared to the known solution using combustion of gases as a heat source for heating the radiant combustion reactor, the use of lasers does not pose problems of environment pollution, and far less safety problems.
- For all these and other reasons, the use of lasers thus allows reducing the operation costs of the radiant combustion reactor and of the apparatus including it.
- Those skilled in the art will readily understand that the lasers used, and their optical power, may vary depending on contingent needs, according to the specific applications. The laser(s) may be operated in Continuous Wave (CW) mode or, preferably, in pulsed mode. also, the laser(s) may be of rotating type, or a laser(s) emitting multiple beams properly out of phase.
- A suitable number of sensors may be associated with the walls of the radiant combustion reactor such as to enable the
control unit 140 to cause the laser radiation hit the desired areas of the radiant combustion reactor walls, scanning the surface according to prescribed patterns in such a way as to cause the surface be homogeneously hit by the optical radiation. - In particular, a specific control software may be executed by the
control unit 140, according to which the surface to be hit by the laser radiation is subdivided according to several different parameters, such as the temperature of the areas already hit by the optical radiation, the difference in temperature between these areas and those not yet hit (the cold areas), the target temperature. A dynamic temperature map can thus be built, and such a temperature map, in addition to being used by the control unit to control the laser(s) (and the positioning thereof), might also be displayed, on suitable display devices, to an operator, so as to enable constantly control the operation of the apparatus. - The control software may be based on variation calculations or on perturbation calculation, or on a simpler “fork shoot” (a term derived from the navy jargon and indicating a successive approximation process). The control software, in conjunction with the reflecting/deflecting arrangement, may allow to hit in a substantially random manner different areas of the walls of the radiant combustion reactor.
- Moreover, the use of laser(s) allows a better controllability of the whole radiant combustion process. In fact, considering for the example the apparatus of
FIG. 1 , by properly driving the pulsed laser(s) through the suitably programmed control unit, the post-combustion process of the exhaust gases can be controlled finely in dependence of the density of the exhaust gases and their velocity, which in turn depend on the engine's RPMs and on the engine operating temperature. - The further embodiments shown schematically in
FIGS. 6A, 6B and 6C, inFIG. 7 and inFIG. 8 relates to radiant combustion reactors within which movable means are provided for propelling the gases during the post-combustion process, and/or for varying the internal geometry of the radiant combustion chamber during operation, particularly by determining a dynamic partition of the radiant combustion chamber. - In particular, in
FIGS. 6A, 6B and 6C there is schematically shown, in axonometric and cross-sectional views, a substantially cylindrical, hollowradiant combustion reactor 1400 with a tri-lobe rotor 1405 (depicted as transparent, for the sake of clarity) rotatably inserted therein, constituted by a generically cylindrical body coaxial to thereactor 1400 and havinglobes rotor 1405 may have different possible cross-sectional areas, as in the two examples shown in the cross-sectional views ofFIGS. 6B and 6C . - A suitable drive arrangement is also provided, not shown in the drawings, for causing the
rotor 1405 to rotate about its axis inside the radiant combustion reactor during the operation. - As in the embodiment of
FIG. 3 , the laser radiation generated by the laser source provided for heating the radiant combustion reactor hits the reactor from the outside thereof. - The exhaust gases to be treated are conveyed into the combustion chamber through an
inlet 1410 i; within the chamber, the rotation of therotor 1405 causes a dynamic partition of the internal space of the chamber into three dynamically-varying portions, and facilitates the flow of the gases towards an outlet 1410 o or 1400 o′; while flowing from the inlet to the outlet, the gases undergoes a post-combustion process due to the radiant energy that is irradiated by the walls of the radiant combustion reactor, heated by the laser radiation. - It is observed that the
inlet 1410 i and the outlet 1410 o or 1400 o′ to/from the radiant combustion reactor can either be axially aligned or not, and either the inlet or the outlet 1410 o or 1400 o′ or both may even be perpendicular to the chamber axis. Other configurations are clearly possible. - In the embodiment of
FIG. 7 , arotor 1505 constituted by an endless screw is rotatably arranged within and extends coaxially to the cylindrical, hollow radiant combustion reactor 1400 (depicted again as transparent, for clarity); again, a suitable drive arrangement, not shown in the drawing, is provided for rotating therotor 1505 about its axis. Also in this case, the cross-sectional shape of the rotor can vary so as to vary the internal volume of the post-combustion chamber, in dependence of the specific application. - Finally, in the embodiment of
FIG. 8 the radiant combustion reactor comprises aspherical combustion chamber 1600, and aninternal rotor 1605 is rotatably arranged within thespherical combustion chamber 1600. Therotor 1605 has a generically spherical shape, with three substantiallyhemispherical depressions rotor 1605 is thus shaped so as to define three post-combustion chambers within thechamber 1600, of suitable volumes. - By properly controlling the motion of the
rotors - It is observed that the combustion process carried out in the radiant combustion chamber may be either continuous, partially continuous or discontinuous (intermittent). By continuous there is intended a process wherein there is no substantial separation between the incoming, relatively cold exhaust gases to be treated and the outgoing, hot and already treated exhaust gases: the cold phase is contiguous to the hot phase. A partially continuous post-combustion process is one in which there is a certain separation in time (for example, of the order of 106 seconds) between the cold and the hot phases, i.e. between the cold and the hot gases; this is for example the case where a combustion chamber such as those of the embodiments of
FIGS. 6A, 6B , 6C, 7 and 8 is used, wherein the provision of the internal rotor allows for a certain separation of the cold gases from the hot gases. A discontinuous or intermittent post-combustion process is instead one in which the post-combustion chamber is loaded with gases, then the chamber is closed, the post-combustion process is carried out, the chamber is opened to discharge the treated gases, and then the process is re-started. - Although the present invention has been disclosed and described by way of some embodiments, it is apparent to those skilled in the art that several modifications to the described embodiments, as well as other embodiments of the present invention are possible without departing from the scope thereof as defined in the appended claims.
- In particular, the radiant combustion reactor may be a mix of the solutions presented in the foregoing.
Claims (12)
1. A radiant combustion reactor, comprising a combustion chamber delimited by radiating walls adapted to radiate electromagnetic radiation in a prescribed wavelength range, and a heating arrangement operatively associated with the radiating walls for heating the walls to a prescribed, radiating temperature,
wherein
said heating arrangement comprises at least one optical radiation source generating an optical radiation that is caused to invest the radiating walls to cause heating thereof.
2. The radiant combustion reactor according to claim 1 , in which said at least one optical radiation source comprises at least one laser.
3. The radiant combustion reactor according to claim 2 , in which said at least one laser is operated in Continuous Wave (CW) regime.
4. The radiant combustion reactor according to claim 2 , in which said at least one laser is operated in pulsed mode.
5. The radiant combustion reactor according to claim 1 , comprising an optical radiation reflecting/deflecting arrangement operatively associated with said at least one laser, for reflecting/deflecting the optical radiation onto the radiating walls of the combustion chamber.
6. The radiant combustion reactor according to claim 5 , comprising a first elongated hollow body defining thereinside the combustion chamber, and surrounded by a second elongated hollow body having internally walls adapted to reflect the optical radiation, said at least one laser being arranged to irradiate the first hollow body from the outside thereof either directly or by reflection/deflection of the laser radiation by the walls of the second hollow body.
7. The radiant combustion reactor according to claim 5 , comprising an inner and an outer elongated hollow bodies arranged one within the other, and defining the combustion chamber in a space comprised therebetween, the inner hollow body having internal walls adapted to reflect the optical radiation, said at least one laser being arranged to irradiate the inner hollow body from the inside thereof either directly or by reflection/deflection of the laser radiation by the walls of the second hollow body.
8. The radiant combustion reactor according to claim 1 , comprising a substantially spherical hollow body defining thereinside the combustion chamber and arranged to be invested by the optical radiation.
9. The radiant combustion reactor according to claim 8 , in which the at least one laser is arranged outside the substantially spherical hollow body.
10. The radiant combustion reactor according to claim 1 , in which means are provided within the combustion chamber for determining a dynamic partition thereof into different parts during a radiant combustion process.
11. The apparatus according to claim 10 , in which said means comprise a rotor rotatably arranged inside the combustion chamber.
12. In a radiant combustion reactor comprising a radiant combustion chamber delimited by walls adapted to radiate electromagnetic radiation in a prescribed wavelength range, a method of heating the radiating walls to a prescribed, radiating temperature,
further comprising
generating an optical radiation, and
causing the heat-radiating walls to be invested by the optical radiation.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT002179A ITMI20032179A1 (en) | 2003-11-12 | 2003-11-12 | POST-COMBUSTION PROCESS FOR THE ELIMINATION OF HARMFUL POLLUTANTS OF DIESEL AND PETROL ENGINES AND IN GENERAL OF ALL THE ENGINES THAT WORK AS A HYDROCARBON AND / OR COMPOSITE HYDROCARBON FUEL, BASED ON THE USE OF LASER PULSA |
ITMI2003A002179 | 2003-11-12 | ||
PCT/EP2003/051115 WO2005050091A1 (en) | 2003-11-12 | 2003-12-30 | A radiant combustion reactor |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2003/051115 Continuation-In-Part WO2005050091A1 (en) | 2003-11-12 | 2003-12-30 | A radiant combustion reactor |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060269886A1 true US20060269886A1 (en) | 2006-11-30 |
Family
ID=34611228
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/433,640 Abandoned US20060269886A1 (en) | 2003-11-12 | 2006-05-12 | Radiant combustion reactor |
Country Status (5)
Country | Link |
---|---|
US (1) | US20060269886A1 (en) |
EP (1) | EP1702178A1 (en) |
AU (1) | AU2003299326A1 (en) |
IT (1) | ITMI20032179A1 (en) |
WO (1) | WO2005050091A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101344503B1 (en) | 2012-09-27 | 2013-12-24 | 현대제철 주식회사 | Radiation pipe burner |
US9897535B2 (en) | 2011-02-22 | 2018-02-20 | Corning Incorporated | Optical reader systems and methods for microplate position detection |
US11305612B2 (en) * | 2018-11-08 | 2022-04-19 | Eberspächer Climate Control Systems GmbH | Combustion chamber assembly unit |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102006045363B3 (en) * | 2006-09-26 | 2008-04-30 | Robert Bosch Gmbh | Emission control system with fine dust filter for biomass heating systems and heating system |
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Also Published As
Publication number | Publication date |
---|---|
EP1702178A1 (en) | 2006-09-20 |
AU2003299326A1 (en) | 2005-06-08 |
WO2005050091A1 (en) | 2005-06-02 |
ITMI20032179A1 (en) | 2005-05-13 |
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