WO2013145867A1 - 排ガス処理方法および排ガス処理装置 - Google Patents
排ガス処理方法および排ガス処理装置 Download PDFInfo
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- WO2013145867A1 WO2013145867A1 PCT/JP2013/052563 JP2013052563W WO2013145867A1 WO 2013145867 A1 WO2013145867 A1 WO 2013145867A1 JP 2013052563 W JP2013052563 W JP 2013052563W WO 2013145867 A1 WO2013145867 A1 WO 2013145867A1
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- gas
- air
- temperature
- exhaust gas
- catalyst
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- 238000011282 treatment Methods 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000003054 catalyst Substances 0.000 claims abstract description 96
- 238000010438 heat treatment Methods 0.000 claims abstract description 60
- 238000003756 stirring Methods 0.000 claims abstract description 44
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims description 43
- 238000002156 mixing Methods 0.000 claims description 33
- 239000000203 mixture Substances 0.000 abstract description 5
- 230000015556 catabolic process Effects 0.000 abstract description 2
- 238000006731 degradation reaction Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 170
- 239000000919 ceramic Substances 0.000 description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 13
- 239000001301 oxygen Substances 0.000 description 13
- 229910052760 oxygen Inorganic materials 0.000 description 13
- 230000006866 deterioration Effects 0.000 description 8
- 238000005192 partition Methods 0.000 description 8
- 238000000354 decomposition reaction Methods 0.000 description 6
- 238000004080 punching Methods 0.000 description 6
- 238000000746 purification Methods 0.000 description 6
- 239000002912 waste gas Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000003985 ceramic capacitor Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 238000013019 agitation Methods 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000011221 initial treatment Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- -1 and the temperature Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
Images
Classifications
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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
-
- 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
- F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
- B01F25/4315—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being deformed flat pieces of material
-
- 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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
-
- 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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/88—Handling or mounting catalysts
- B01D53/885—Devices in general for catalytic purification of waste gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/10—Mixing gases with gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/421—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions by moving the components in a convoluted or labyrinthine path
- B01F25/423—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions by moving the components in a convoluted or labyrinthine path by means of elements placed in the receptacle for moving or guiding the components
- B01F25/4231—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions by moving the components in a convoluted or labyrinthine path by means of elements placed in the receptacle for moving or guiding the components using baffles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
- B01F25/43197—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor characterised by the mounting of the baffles or obstructions
- B01F25/431974—Support members, e.g. tubular collars, with projecting baffles fitted inside the mixing tube or adjacent to the inner wall
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/45—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
- B01F25/452—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces
- B01F25/4521—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces the components being pressed through orifices in elements, e.g. flat plates or cylinders, which obstruct the whole diameter of the tube
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/21—Measuring
- B01F35/211—Measuring of the operational parameters
- B01F35/2115—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/22—Control or regulation
- B01F35/221—Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
- B01F35/2211—Amount of delivered fluid during a period
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
Definitions
- the present invention relates to an exhaust gas treatment method and an exhaust gas treatment device, and more specifically, for example, occurs in a step of heat-treating a ceramic laminate formed by laminating a ceramic body or a ceramic green sheet formed from a ceramic raw material, and the like.
- the present invention relates to an exhaust gas treatment method and an exhaust gas treatment apparatus used for treating exhaust gas containing an organic component to be removed.
- Exhaust gas containing decomposition gas, combustion gas, etc. (hereinafter also simply referred to as “organic component”) generated by incomplete decomposition or combustion of an organic substance such as a binder contained in is generated. And since such exhaust gas is harmful to a human body or has a bad odor, it is usually necessary to perform an appropriate treatment.
- untreated exhaust gas (treated gas) is heated to a predetermined temperature in the heating zone (Z 1 ), and catalyst 104
- a catalytic exhaust gas treatment apparatus 101 that passes through a reaction zone (Z 2 ) provided with a gas, and purifies the harmful malodorous component contained in the gas to be treated by oxidative combustion or thermal decomposition in the presence of the catalyst 104. It has been proposed (see Patent Document 1).
- this catalytic exhaust gas treatment apparatus 101 when the treated exhaust gas (process gas) is discharged to the outside, the hydrocarbon concentration is detected by the gas sensor 105, and when the concentration is lower than a preset purification reference concentration, The heating value of the heating device (burner) 103 is reduced within a range not exceeding the purification reference concentration, and when the concentration becomes higher than the purification reference concentration, the heating value of the burner 103 is increased until the concentration becomes equal to or less than the purification reference concentration.
- the purification process is performed at the lowest temperature that satisfies the purification standard concentration, thereby reducing the temperature load of the catalyst.
- the parameter for controlling the gas temperature by controlling the heating value of the heating device is the organic gas concentration (hydrocarbon concentration) measured downstream from the catalyst. If there is no certain organic gas (hydrocarbon) in the exhaust gas, there is a problem that information for controlling the heating value of the heating device cannot be obtained. Further, in this exhaust gas treatment device, the heating value of the heating device is controlled by the concentration of organic gas in the exhaust gas after the catalyst treatment, so that the exhaust gas temperature when passing through the catalyst is a temperature that damages the catalyst. May cause deterioration of the catalyst.
- An object of the present invention is to solve the above-mentioned problems, and to provide an exhaust gas treatment method and an exhaust gas treatment device capable of efficiently removing organic components contained in exhaust gas while suppressing deterioration of the catalyst. To do.
- the exhaust gas treatment method of the present invention comprises: A heat treatment step of heating the gas to be treated sent from a predetermined previous step in a state containing an organic component to be decomposed, and An air mixing step of mixing air with the heat-treated heat-treated gas so that the temperature of the air-mixed gas is equal to or lower than a predetermined temperature; And a catalyst processing step of processing the air mixed gas in a catalyst processing chamber in which a catalyst is disposed.
- the exhaust gas treatment method of the present invention preferably includes a stirring step of stirring the air mixed gas to make the air mixed gas uniform.
- the temperature of the air mixed gas is detected before the catalyst processing chamber, and the amount of air mixed with the heat processing gas is controlled by the air mixing unit according to the detected temperature of the air mixed gas. It is preferable that it is comprised.
- the temperature of the air mixed gas supplied to the catalyst treatment step can be controlled to a temperature at which the load on the catalyst does not increase, and the present invention is further effectively realized. Can do.
- the temperature of the air mixed gas is detected downstream from the region where the air mixed gas is stirred, and the air mixed with the heat treatment gas in the air mixing unit according to the detected temperature of the air mixed gas It is preferable to be configured to control the amount of.
- the present invention can be further effectively realized.
- the exhaust gas treatment apparatus of the present invention is A heat treatment chamber for heating a gas to be treated that has been sent from a predetermined previous process in a state containing an organic component to be decomposed; An air mixing unit that mixes air with the heat treatment gas that has been heat-treated in the heat treatment chamber, and sets the temperature of the air mixed gas to a predetermined temperature or lower; And a catalyst processing chamber for processing the air mixed gas mixed with air in the air mixing section in contact with the catalyst.
- the exhaust gas treatment apparatus includes an agitation mechanism for agitating the air mixed gas to make the air mixed gas uniform.
- an agitation mechanism for agitating the air mixed gas to make the air mixed gas uniform.
- the exhaust gas treatment apparatus of the present invention is Temperature detecting means for detecting the temperature of the air mixed gas in front of the catalyst processing chamber; It is preferable to include a control valve that controls the amount of air mixed with the heat treatment gas in the air mixing unit in accordance with the temperature detected by the temperature detecting means.
- the temperature of the air mixed gas supplied to the catalyst processing chamber can be controlled to a temperature at which the load on the catalyst does not increase, and the present invention is further effectively realized. Can do.
- temperature detection means for detecting the temperature of the air mixed gas downstream from the stirring mechanism, and air mixed with the heat treatment gas in the air mixing section according to the temperature detected by the temperature detection means
- a control valve for controlling the amount of gas.
- the exhaust gas treatment method of the present invention includes a heat treatment step for heat treating a gas to be treated, an air mixing step for mixing air with the heat treatment gas, and a catalyst treatment step for catalytically treating the air mixed gas. Since it comprises, the organic component contained in waste gas can be efficiently removed, suppressing the deterioration of the catalyst in a catalyst treatment process.
- the exhaust gas treatment apparatus of the present invention includes a heat treatment chamber for heating a gas to be treated, an air mixing unit for mixing air with the heat treatment gas, an air mixed gas, and a catalyst inside. Since the catalyst treatment chamber for treating in the catalyst treatment chamber is provided, organic components contained in the exhaust gas can be efficiently removed while suppressing deterioration of the catalyst in the catalyst treatment step.
- the load of the catalyst may be increased.
- conditions such as the heating temperature are adjusted to adjust the degree of decomposition of the organic components, and air is mixed with the heat treatment gas after the heat treatment to perform the catalyst treatment (secondary treatment) step.
- the load on the catalyst can be reliably and appropriately controlled so that the load on the catalyst is not excessively increased, and the life of the catalyst can be extended.
- FIG. 1 is a diagram schematically showing a configuration of an exhaust gas treatment apparatus according to an embodiment of the present invention.
- the exhaust gas containing the organic component to be processed which is generated when the ceramic laminate formed by laminating the ceramic green sheets is heat-treated and debinding is performed.
- An explanation will be given by taking an exhaust gas treatment apparatus used for treatment as an example.
- the exhaust gas treatment apparatus A1 of Embodiment 1 includes a heat treatment chamber 1 that performs heat treatment (primary treatment) by heating a gas to be treated containing an organic component to be decomposed derived from a binder.
- the air mixing unit 2 that mixes air with the heat processing gas heated in the heat processing chamber 1 and the air mixed gas mixed with air in the air mixing unit 2 are brought into contact with the catalyst for further processing (secondary processing). ) Catalyst processing chamber 3.
- the heat treatment chamber 1 is a mechanism for heating the exhaust gas to a certain temperature, and there is no particular restriction on its specific structure.
- the heating temperature in the heat treatment chamber 1 varies depending on the extent to which the decomposition of the organic components proceeds in the heat treatment step.
- the heating temperature in the heat treatment chamber 1 is usually preferably 500 to 650 ° C.
- the air mixing unit 2 for mixing air with the heat treatment gas heat-treated in the heat treatment chamber 1 is a region for mixing the heat treatment gas and air (diluting the heat treatment gas).
- a control valve 21 for controlling the amount of air to be mixed is provided.
- the temperature of the air mixed gas sent to the catalyst processing chamber 3 is detected at a position before the catalyst processing chamber 3 in the gas flow path 5 through which the air mixed gas mixed with air in the air mixing section 2 passes.
- a temperature detecting means 22 is provided.
- the opening degree of the control valve 21 is adjusted by the temperature of the air mixed gas detected by the temperature detecting means 22 disposed at the position immediately before the catalyst processing chamber 2. Yes. Thereby, it becomes possible to control the temperature of the air mixed gas supplied to the catalyst processing chamber 3 to a temperature at which the load on the catalyst does not become too large.
- the catalyst processing chamber 3 contains a catalyst in which a noble metal catalyst is supported on a ceramic carrier as a catalyst.
- a honeycomb carrier having a honeycomb structure is used.
- the catalyst processing chamber 3 is insulated from the outside by a heat insulating material, but no heating means is provided. However, from the viewpoint of improving the degree of freedom of temperature control, it is possible to adopt a configuration provided with heating means.
- the exhaust gas treatment apparatus A1 of Embodiment 1 almost all of the organic components to be removed are decomposed and removed when the air mixed gas passing through the catalyst treatment chamber 3 comes into contact with the catalyst inside the catalyst treatment chamber 3. It is configured to be.
- the exhaust gas generated when the binder was removed by heat treatment of the ceramic laminate was treated.
- the internal temperature of the heat treatment chamber 1 was maintained at 500 to 650 ° C., and the degree of decomposition of the organic components in the heat treatment (primary treatment) was adjusted.
- the air introduction amount in the air mixing unit 2 is such that air is introduced by adjusting the opening of the control valve 21 so that the temperature detected by the temperature detection means 22 is 350 to 450 ° C.
- the graph of FIG. 2 shows the relationship between the exhaust gas treatment time (period), the catalyst performance deterioration prediction, and the actual measurement value.
- the catalyst performance shown on the vertical axis of the graph of FIG. 2 is a normal space velocity (the amount of gas passing per unit time and the catalyst volume) as an evaluation condition for clarifying the behavior of catalyst performance degradation. This corresponds to the amount of the organic component decomposed per unit time at each time point when the exhaust gas treatment is performed at an excess space velocity about three times as large as the ratio.
- the catalyst life When the catalyst performance value is defined as 50% of the initial value as the catalyst life, the catalyst life was about 42 months as predicted based on actual measurements.
- the catalyst life of about 42 months is a high life as a catalyst life of the noble metal-supported type.
- FIG. 3 is a view showing an exhaust gas treatment apparatus A2 according to another embodiment of the present invention.
- a stirring mechanism 23 for stirring the air mixed gas mixed with air in the air mixing unit 2 in the vicinity of the outlet of the air mixing unit 2 to make the air mixed gas uniform. It has.
- Other configurations are the same as those of the exhaust gas treatment apparatus A1 of the first embodiment.
- the stirring mechanism 23 includes the stirring mechanism 23 formed by combining one side member 23a and the other side member 23b shown in FIGS. 4 (a), 4 (b) and FIG. Yes. 4A is a top view of the stirring mechanism 23, and FIG. 4B is a bottom view.
- the one side member 23a which comprises the stirring mechanism 23 is a square plate-shaped member, Comprising: It has the four gas passage parts 24a formed by giving a cut and raised process.
- Each gas passage portion 24a includes an inclined cut and raised piece 25a, a vertical upright piece 26a joined by welding, and an opening 27a.
- the four gas passage portions 24a are arranged at equal intervals in the circumferential direction when seen in a plan view.
- the other side member 23b is also a rectangular plate-like member, and includes four gas passage portions 24b formed by cutting and raising.
- Each gas passage portion 24b includes a cut and raised piece 25b, a vertical upright piece 26b joined by welding, and an opening 27b.
- the four gas passage portions 24b are arranged at equal intervals in the circumferential direction when seen in a plan view. However, in the other side member 23b, the arrangement positions (planar positions) of the four gas passage portions 24b are shifted in the circumferential direction by 30 ° with respect to the gas passage portions 24a of the one side member 23a.
- the stirring mechanism 23 formed by bonding the above-mentioned one side member 23a and the other side member 23b in a manner as shown in FIGS. 4 (a), 4 (b) and FIG.
- the gas passage portions 24a and 24b which function as a mixer and include cut and raised pieces 25a and 25b, vertical upright pieces 26a and 26b, and openings 27a and 27b, function as guide vanes.
- the stirring mechanism 23 when the stirring mechanism 23 is provided, even when the distance in the axial direction of the gas flow path 5 is short, the swirl flow is generated to efficiently stir the air-mixed gas, and the temperature, oxygen concentration, decomposition A gas with no bias in the organic component concentration to be supplied can be supplied to the catalyst processing chamber 3.
- the stirring mechanism 23 that functions as a static mixer without a drive unit, and various configurations that can improve variations in the temperature and oxygen concentration of the air mixed gas are possible. It is.
- the exhaust gas treatment apparatus A2 of the second embodiment it is possible to greatly reduce the uneven load on the catalyst, so that the catalyst life can be further extended compared to the case of the first embodiment.
- FIG. 9A is a diagram showing a configuration of a main part of an exhaust gas treatment apparatus A3 according to still another embodiment (Embodiment 3) of the present invention, and FIG. 9B is agitation in the exhaust gas treatment apparatus of FIG. 9A. It is a figure which shows the punching plate currently used for comprising a mechanism.
- a stirring mechanism 23 for stirring the air mixed gas is provided in the vicinity of the outlet of the air mixing unit 2.
- the agitating mechanism 23 is provided with two punching plates 33a and 33b each having a plurality of through holes 34a and 34b shown in FIG. 9B at a predetermined interval in the flow direction of the air mixed gas. It is formed by doing.
- Other configurations are the same as those in the second embodiment.
- the punching plates 33a and 33b are arranged with their positions shifted so that the through holes 34a and 34b do not face each other.
- the stirrer mechanism 23 formed by combining the two punching plates 33a and 33b is provided as in the exhaust gas treatment apparatus A3 of the third embodiment, the air mixed gas is efficiently stirred, and the temperature and oxygen concentration Thus, it is possible to supply an air mixed gas that is not biased to the catalyst processing chamber 3, and stable gas processing can be performed. Therefore, even when the exhaust gas treatment apparatus A3 of the third embodiment is used, the load on the catalyst can be reduced and the catalyst life can be further extended as compared with the case of the first embodiment.
- FIG. 10 (a) is a diagram showing a configuration of a main part of an exhaust gas treatment apparatus A4 according to still another embodiment (Embodiment 4) of the present invention, and FIG. 10 (b) is agitated in the exhaust gas treatment apparatus of FIG. 10 (a). It is a figure which shows the partition plate currently used for comprising a mechanism.
- the stirring mechanism 23 shown in FIG. 10A is formed by two partition plates 43a and 43b. Specifically, the two partition plates 43a and 43b are arranged at a predetermined interval in the flow direction of the air mixed gas so that the openings 44a and 44b formed in the gas flow path 5 are located on the opposite sides. It is formed by installing. Other configurations are the same as those in the second embodiment.
- the stirring mechanism 23 is formed by combining the partition plates 43a and 43b as in the fourth embodiment, the air mixed gas is efficiently stirred so that the air mixed gas that is not biased to temperature, oxygen concentration, or the like. It becomes possible to supply to the catalyst processing chamber 3, and stable gas processing can be performed.
- the method of configuring the stirring mechanism with this partition plate is a simple method compared to the case of the second and third embodiments, and is inexpensive stirring means when a certain bias can be allowed with respect to temperature, oxygen concentration and the like. It can be used as
- the present invention is not limited to each of the above-described embodiments.
- the specific structure of the heat treatment chamber, the air mixing unit, and the catalyst treatment chamber, the configuration and arrangement of the temperature detection means and the stirring mechanism, and the air supply amount can be made within the scope of the invention with regard to the configuration of the control valve for controlling the control.
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- General Engineering & Computer Science (AREA)
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- Incineration Of Waste (AREA)
Abstract
Description
また、この排ガス処理装置においては、触媒処理後の排ガス中の有機ガス濃度により加熱装置の発熱量を制御するようにしているので、触媒を通過する際の排ガス温度が、触媒にダメージを与える温度となる場合があり、触媒の劣化を引き起こす場合がある。
分解処理すべき有機成分を含んだ状態で所定の前工程から送られてきた被処理ガスを加熱する加熱処理工程と、
加熱処理された加熱処理ガスに空気を混合して、空気混合ガスの温度を所定の温度以下にする空気混合工程と、
前記空気混合ガスを、内部に触媒を配設した触媒処理室で処理する触媒処理工程と
を備えていることを特徴としている。
上述の攪拌工程を設けることにより、触媒処理工程における触媒への負荷の偏りを確実に低減することが可能になり、本発明をより実効あらしめることができる。
上記構成を備えている場合、触媒処理工程に供給される空気混合ガスの温度を、触媒への負荷が大きくなることのない温度に制御することが可能になり、本発明をさらに実効あらしめることができる。
上記構成を備えている場合、攪拌され、均一にされた状態で触媒処理工程に供給される空気混合ガスの温度を、触媒への負荷が大きくなることのない温度に確実に制御することが可能になり、本発明をさらに実効あらしめることができる。
分解処理すべき有機成分を含んだ状態で所定の前工程から送られてきた被処理ガスを加熱する加熱処理室と、
前記加熱処理室で加熱処理された加熱処理ガスに空気を混合して、空気混合ガスの温度を所定の温度以下にする空気混合部と、
前記空気混合部で空気が混合された空気混合ガスを、触媒と接触させて処理する触媒処理室と
を具備することを特徴としている。
上述の攪拌機構を設けることにより、触媒処理工程における触媒への負荷の偏りを確実に減らすことが可能になり、本発明をより実効あらしめることができる。
これに対して、上述のような攪拌機構を備えた構成とした場合には、空気混合ガスの流路を長くすることによる装置の大型化を招くことなく、効率よく空気混合ガスの均一化を図ることが可能になる。
その結果、装置を大型化することを必要とせずに、触媒の劣化を抑制しつつ、効率よく排ガスの処理を行うことが可能になる。
前記触媒処理室の手前で前記空気混合ガスの温度を検出する温度検出手段と、
前記温度検出手段により検出される温度に応じて、前記空気混合部で前記加熱処理ガスに混合される空気の量を制御する制御弁と
を備えていることが好ましい。
上記構成を備えている場合、触媒処理室に供給される空気混合ガスの温度を、触媒への負荷が大きくなることのない温度に制御することが可能になり、本発明をさらに実効あらしめることができる。
上記構成を備えている場合、攪拌され均一にされた状態で触媒処理室に供給される空気混合ガスの温度を、触媒への負荷が大きくなることのない温度に確実に制御することが可能になり、本発明をさらに実効あらしめることができる。
図1は、本発明の一実施形態にかかる排ガス処理装置の構成を模式的に示す図である。
この実施形態1では、積層セラミックコンデンサの製造工程で、セラミックグリーンシートを積層することにより形成されたセラミック積層体を熱処理して脱バインダーを行う際に発生した、処理すべき有機成分を含む排ガスの処理に用いられる排ガス処理装置を例にとって説明する。
触媒処理室3は、断熱材により外部との断熱は行っているが、特に加熱手段は設けていない。ただし、温度制御の自由度を向上させる見地から、加熱手段を備えた構成とすることも可能である。
なお、この実施形態1の排ガス処理装置A1は、触媒処理室3を通過する空気混合ガスが、触媒処理室3の内部の触媒と接触することにより、除去すべき有機成分はほとんどすべてが分解除去されるように構成されている。
また、空気混合部2における空気導入量は、温度検出手段22による検出温度が350~450℃となるように制御弁21の開度を調整して空気を導入するようにした。
排ガス処理の時間(期間)と、触媒性能の劣化予測および実測値の関係を図2のグラフに示す。なお、図2のグラフの縦軸に示した触媒性能は、触媒性能の低下の挙動を明瞭にするための評価条件として、通常の空間速度(単位時間当たりに通過するガス量と触媒体積との比)に比べて約3倍の過剰な空間速度で排ガス処理を実施した場合における、各時点での単位時間当たりに分解した有機成分の量に相当するものである。
図3は、本発明の他の実施形態にかかる排ガス処理装置A2を示す図である。
この実施形態2の排ガス処理装置A2は、空気混合部2の出口近傍に、空気混合部2で空気が混合された空気混合ガスを攪拌して、空気混合ガスを均一化するための攪拌機構23を備えている。その他の構成は、上記実施形態1の排ガス処理装置A1と同じである。
そして、4つのガス通過部24aは、平面的にみて周方向に等しい間隔をおいて配設されている。
この他方側部材23bにおいても、4つのガス通過部24bは、平面的にみて周方向に等しい間隔をおいて配設されている。ただし、他方側部材23bにおいては、4つのガス通過部24bの配設位置(平面位置)を、一方側部材23aのガス通過部24aに対して、30°周方向に位置をずらしている。
そして、ガス流路5の触媒処理室3の直前位置の、空気混合ガスの流動方向に直交する面における所定の複数の位置、すなわち、図6の(1),(2),(3),(4),(5)の各位置の温度および酸素濃度を調べることにより、温度および酸素濃度の偏りの状態を観察した。ここで、加熱処理室1の通過ガス(空気を混合する前のガス)は、評価のため全て窒素としている。なお、比較のため、攪拌機構を備えていない排ガス処理装置について、各位置の空気混合ガスの温度および酸素濃度を調べた。その結果を図7および図8に示す。
この実施形態2の排ガス処理装置A2を用いた場合、触媒への負荷の偏りを大幅に軽減することが可能になることから、触媒寿命を実施形態1の場合よりもさらに延ばすことができる。
図9(a)は本発明のさらに他の実施形態(実施形態3)にかかる排ガス処理装置A3の要部構成を示す図、図9(b)は図9(a)の排ガス処理装置において攪拌機構を構成するのに用いられているパンチングプレートを示す図である。
そして、攪拌機構23は、図9(b)に示す、貫通孔34a,34bが多数個形成された2枚のパンチングプレート33a,33bを空気混合ガスの流動方向に所定の間隔をおいて配設することにより形成されている。その他の構成は、上記実施形態2の場合と同様である。
したがって、この実施形態3の排ガス処理装置A3を用いた場合も、触媒への負荷の偏りを軽減して、触媒寿命を実施形態1の場合よりもさらに延ばすことができる。
図10(a)は本発明のさらに他の実施形態(実施形態4)にかかる排ガス処理装置A4の要部構成を示す図、図10(b)は図10(a)の排ガス処理装置において攪拌機構を構成するのに用いられている仕切り板を示す図である。
この仕切り板により攪拌機構を構成する方法は、上記実施形態2および3の場合と比較して、簡易な方法であり、温度、酸素濃度などに関し、一定の偏りを許容できる場合において安価な撹拌手段として使用することが可能である。
2 空気混合部
3 触媒処理室
5 ガス流路
21 制御弁
22 温度検出手段
23 攪拌機構
23a 一方側部材
23b 他方側部材
24a 一方側部材のガス通過部
24b 他方側部材のガス通過部
25a 一方側部材の切り起こし片
25ba 他方側部材の切り起こし片
26a 一方側部材の垂直起立片
26b 他方側部材の垂直起立片
33a,33b パンチングプレート
34a,34b 貫通孔
43a,43b 仕切り板
44a,44b 開口部
A1,A2,A3,A4 排ガス処理装置
Claims (8)
- 分解処理すべき有機成分を含んだ状態で所定の前工程から送られてきた被処理ガスを加熱する加熱処理工程と、
加熱処理された加熱処理ガスに空気を混合して、空気混合ガスの温度を所定の温度以下にする空気混合工程と、
前記空気混合ガスを、内部に触媒を配設した触媒処理室で処理する触媒処理工程と
を備えていることを特徴とする排ガス処理方法。 - 前記空気混合ガスを攪拌して、前記空気混合ガスを均一化する攪拌工程を備えていることを特徴とする請求項1記載の排ガス処理方法。
- 前記触媒処理室の手前で前記空気混合ガスの温度を検出し、検出した前記空気混合ガスの温度に応じて、前記空気混合部で前記加熱処理ガスに混合される空気の量を制御するように構成されていることを特徴とする請求項1または2記載の排ガス処理方法。
- 前記空気混合ガスの攪拌を行う領域より下流で前記空気混合ガスの温度を検出し、検出した前記空気混合ガスの温度に応じて、前記空気混合部で前記加熱処理ガスに混合される空気の量を制御するように構成されていることを特徴とする請求項2記載の排ガス処理方法。
- 分解処理すべき有機成分を含んだ状態で所定の前工程から送られてきた被処理ガスを加熱する加熱処理室と、
前記加熱処理室で加熱処理された加熱処理ガスに空気を混合して、空気混合ガスの温度を所定の温度以下にする空気混合部と、
前記空気混合部で空気が混合された空気混合ガスを、触媒と接触させて処理する触媒処理室と
を具備することを特徴とする排ガス処理装置。 - 前記空気混合ガスを攪拌して、前記空気混合ガスを均一化する攪拌機構を備えていることを特徴とする請求項5記載の排ガス処理装置。
- 前記触媒処理室の手前で前記空気混合ガスの温度を検出する温度検出手段と、
前記温度検出手段により検出される温度に応じて、前記空気混合部で前記加熱処理ガスに混合される空気の量を制御する制御弁と
を備えていることを特徴とする請求項5または6記載の排ガス処理装置。 - 前記攪拌機構より下流側で前記空気混合ガスの温度を検出する温度検出手段と、
前記温度検出手段により検出される温度に応じて、前記空気混合部で前記加熱処理ガスに混合される空気の供給量を制御する制御弁と
を備えていることを特徴とする請求項6記載の排ガス処理装置。
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