JP2002267128A - Exhaust gas treating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a large quantity of smoke, carbon monoxide or the like from being emitted from a combustion furnace. SOLUTION: An exhaust gas treating apparatus is provided on the way of an exhaust gas passage 37 and is provided with an exhaust gas treating unit 42 for supplying a turning air and a fuel to surely form a secondary combustion flame 64 to secondarily burn a combustion gas 63. Thus, not only the smoke, but also an odor, carbon monoxide or the like can be prevented to be generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas treatment apparatus for purifying exhaust gas by reduction firing when ceramics are fired at home.

[0002]

2. Description of the Related Art As a conventional exhaust gas treatment apparatus of this type, for example, there has been one disclosed in Japanese Utility Model Laid-Open No. 7-2721. FIG. 8 shows a conventional exhaust gas treatment apparatus described in the above publication.

In FIG. 8, reference numeral 1 denotes a secondary combustion air supply pipe to which air is sent from a motor fan 7, and 2 denotes an obliquely upward hole provided to discharge air in a spiral shape.
Is a chimney facing the obliquely upward hole 2, 4 is a combustion chamber (incineration chamber) in which the chimney 3 communicates with the upper part, 5 is water put around the combustion chamber 4 composed of a double iron plate, Reference numeral 6 denotes a lid for putting incineration material into the combustion chamber 4.

[0004]

However, in the above-described conventional configuration, the incinerated material in the combustion chamber 4 is ignited and combustion is started. Therefore, the amount and type of the incinerated material are not constant from the beginning, and the spiral shape is not uniform. It is difficult to match the amount of air burned to the incinerated material at that time, and it is not possible to supply the optimal amount of air for combustion, so even if smoke is reduced, combustion is cooled and a large amount of odors and carbon monoxide are emitted. Had.

The present invention solves the above-mentioned conventional problems. An exhaust gas treatment section for introducing swirling air and fuel to perform secondary combustion of combustion gas is provided in the middle of an exhaust passage to provide a stable secondary combustion flame. The purpose of the formation is to prevent the generation of not only smoke but also odor and carbon monoxide.

[0006]

In order to solve the above-mentioned conventional problems, an exhaust gas treatment apparatus according to the present invention is provided with an exhaust passage for exhausting a combustion gas, and is provided in the middle of the exhaust passage to supply swirling air and fuel. And an exhaust gas treatment section for secondary combustion of the combustion gas.

As a result, a stable secondary combustion flame is formed in the exhaust passage, so that generation of not only smoke but also odor and carbon monoxide can be prevented.

[0008]

The invention according to claim 1 is provided with an exhaust passage for exhausting a combustion gas, and provided in the exhaust passage,
By providing the exhaust gas processing unit that supplies swirling air and fuel to perform secondary combustion of the combustion gas, generation of not only smoke but also odor and carbon monoxide can be prevented.

The invention described in claim 2 is particularly advantageous in claim 1.
The exhaust gas processing unit described in 1) atomizes the fuel and supplies it to the exhaust passage, so that the swirling air and the fuel are uniformly mixed with a simple configuration to stably form the secondary combustion flame, and not only smoke but also odor And generation of carbon monoxide and the like can be prevented.

[0010] The invention described in claim 3 is particularly advantageous in claim 1.
The exhaust gas treatment unit described in paragraph 2 above, grasps the temperature inside the furnace and adjusts the supply amount of fuel, thereby forming a secondary combustion flame having a combustion amount according to the state of the combustion gas, not only smoke but also odor. And generation of carbon monoxide can be prevented.

[0011] The invention described in claim 4 is particularly advantageous in claim 1.
The exhaust gas processing unit according to the above, by providing a supply unit that varies the amount of swirling air and the amount of air sent to the fuel supply unit in the middle of an air passage communicating with the air blowing means of the burner, according to the state of the combustion gas By forming a secondary combustion flame in which the distribution of the swirling air and the air sent to the fuel supply unit is adjusted, generation of not only smoke but also odor and carbon monoxide can be prevented.

[0012] The invention described in claim 5 is particularly advantageous in claim 1.
By constantly supplying air to the fuel supply unit, the exhaust gas processing unit described in (1) can prevent backflow of high-temperature combustion gas from the fuel supply unit and prevent damage to the exhaust gas treatment device.

[0013] The invention described in claim 6 is particularly advantageous in claim 1.
By forming the secondary combustion flame before performing the exhaust gas treatment of the combustion gas, it is possible to prevent the untreated passage of the combustion gas and reliably perform the secondary combustion.

[0014] The invention described in claim 7 is particularly advantageous in claim 1.
The exhaust gas processing section described in 2) forms a secondary combustion flame after the processing of the combustion gas is completed, thereby burning and removing soot adhering to the exhaust passage and the swirl cylinder, and preventing the discharge of soot to the outside. can do.

[0015] The invention described in claim 8 is particularly advantageous in claim 1.
The exhaust gas processing unit described in the above, provided with a combustion support cylinder having a plurality of through holes around the swirl cylinder, by supplying combustion gas and fuel inside the combustion support cylinder, by the recirculation flow of the secondary combustion flame By increasing the temperature of the combustion gas, secondary combustion can be promoted and the exhaust gas treatment performance can be improved.

The invention described in claim 9 is particularly advantageous in claim 1.
By providing a burner ring on the downstream side of the swirl cylinder to reduce the cross-sectional area of the exhaust passage,
The combustion gas is retained in the exhaust passage, the temperature in the exhaust passage is raised, the secondary combustion can be promoted, and the exhaust gas treatment performance can be improved.

According to a tenth aspect of the present invention, in particular, the exhaust gas treatment section according to the first aspect is provided with a flame spread plate larger than the outer periphery of the swirl cylinder at the downstream end of the swirl cylinder. By expanding the flame formed in the cylinder into the exhaust passage, untreated passage of the combustion gas can be prevented, and the exhaust gas treatment performance can be improved.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view of an exhaust gas treatment apparatus according to Embodiment 1 of the present invention. Figure 1
Numeral 8 denotes a fuel supply means comprising a pulse pump, a cylinder pump, an electromagnetic pump, and a rotary pump for pumping kerosene (or light oil) as a liquid fuel from a constant oil level device (leveler) 9 to a burner 10. Reference numeral 11 denotes a tapered rotary atomizing unit to which liquid fuel is supplied from the fuel supply unit 8 via the oil feed pipe 12 and atomizes the fuel.

Reference numeral 13 denotes a vaporizer provided around the rotary atomizer 11, which is made of a heat-resistant material having good heat conductivity, particularly an aluminum alloy such as aluminum or duralumin, brass, copper, steel, or cast iron. On the upstream side of the vaporizer 13, a vaporizing air port 15 partially open is provided so that the oil feed pipe 12 and the shaft 14 of the rotary atomizing unit 11 are inserted. An air chamber 16, an air blowing chamber 17, and an air supply chamber 18 are provided upstream of the vaporizing air port 15. The air chamber 16, the air blowing chamber 17, and the air supply chamber 18 form partitioned spaces, and communicate with each other through an opening through which the shaft 14 passes. An air inlet 19 is provided in a part of the air supply chamber 18. Motor 20 provided on the side of air supply chamber 18
Are connected to the shaft 14, and the air chamber 16, the blowing chamber 17, and the air supply chamber 1
8.

Numeral 21 denotes an impeller provided in the blower chamber 17, which is constructed in such a manner as to use a turbo fan or a radial fan in combination with one or more stages so that the blowing pressure becomes high. The blower chamber 17, motor 20, impeller 21
Constitutes the blowing means 22.

Reference numeral 23 denotes a tubular combustion tube provided around the vaporizer 13 and is provided in a shape of a convergent portion, and is made of a heat-resistant material such as steel, iron, cast iron or ceramic. Reference numeral 24 denotes a flame port provided at the downstream end of the vaporizer 13 and is formed in a porous shape, and is made of a heat-resistant material such as steel, iron, cast iron, titanium, durmin, or ceramic. 25 is a secondary air port around the bottom of the carburetor 13 and inside the combustion cylinder 23,
A plurality is provided so as to communicate with 6. Reference numeral 26 denotes an electric heater, which is cast into the vaporizer 13 and is particularly formed in the form of a sheath heater using a heating element of a nichrome wire or a Kanthal wire. Reference numeral 27 denotes a vaporizer temperature detecting section for detecting the temperature of the vaporizer 13, which is particularly constituted by a thermistor and a thermocouple.

Reference numeral 28 denotes a control unit, which is a vaporizer temperature detection unit 27.
The electric heater 26 is turned on and off from the signal of (1) to maintain the vaporizer 13 at a predetermined temperature. The control unit 28
The fuel supply means 8 and the impeller 21 are controlled to an appropriate state in accordance with the instruction of the operation switch and the magnitude of the load, so that the fuel and the air are adjusted. Control unit 2
Numeral 8 regulates fuel and air to produce oxidation firing (a firing method that does not generate soot and carbon monoxide) and reduction firing (a firing method that generates soot and carbon monoxide).

Reference numeral 29 denotes a tub-shaped furnace in which the tip of the burner 10 is inserted into a fire inlet 31 provided near the bottom of the side wall 30. The furnace 29 uses a heat-resistant alumina or silica ceramic or brick heat insulating material for the side wall 30. The outside of the side wall 30 is covered with a plate-shaped protection wall 32 made of heat-resistant steel, iron, or aluminum. The upper part of the furnace 29
A lid-like carry-in / carry-out part 34 for carrying in / out the ceramic art work 33 is provided. The carry-in / carry-out section 34 is lined with a heat-resistant alumina or silica ceramic or brick heat insulating material, and is entirely assembled with a protective cover 35. Further, the protective cover 35 is provided with a handle for facilitating opening and closing and a stopper for preventing high-temperature gas from leaking. Reference numeral 36 denotes an exhaust port provided above the fire inlet 31 of the side wall 30 of the furnace 29, and communicates with an exhaust passage 37 to discharge a high-temperature gas to the outside.

Reference numeral 38 denotes a swivel cylinder inserted into the exhaust passage 37, which is made of a heat-resistant material such as ceramic, steel, or titanium. In the vicinity of the tip of the swivel cylinder 38, a plurality of swirling ports 3 for blowing air in a tangential direction around the swivel cylinder 38 to swirl.
9 are provided. The turning port 39 is formed by cutting and raising a member on the peripheral wall of the turning cylinder 38 or forming it into a projection shape. The revolving cylinder 38 uses a heat-resistant ceramic, steel, or titanium packing or a sealing material to allow the revolving cylinder 38 to face the exhaust passage 37, thereby enhancing the sealing performance with the outer wall 40 of the exhaust passage 37. The air introduction side of the turning cylinder 38 communicates with the air chamber 16 of the burner 10 via the air passage 41.

Reference numeral 42 denotes an exhaust gas processing unit 42, which is an exhaust passage 3
7, a swivel cylinder 38 and an air passage 41. The exhaust gas processing unit 42 controls the air flow resistance of the vaporizer 1 of the burner 10.
When the air is supplied by the blowing means 22 of the burner 10, the air is easily released to the swivel cylinder 38 side, and the rotation speed of the impeller 21 is reduced.
When the reduction is strengthened, the ratio of the air from the swirl cylinder 38 is increased to facilitate the exhaust gas treatment.

Reference numeral 43 denotes a fuel supply unit, which comprises a vaporization unit 44, a fuel outlet 45, an air pipe 46, and a fuel supply pipe 47. The vaporization section 44 is made of a heat-resistant material having good heat conductivity, particularly an aluminum alloy such as aluminum or duralumin, brass, copper, steel, or cast iron. Numeral 48 denotes an electrothermal heater cast into the vaporizing section 44, which is formed in particular as a sheathed heater using a heating element of a nichrome wire or a Kanthal wire. Reference numeral 49 denotes a vaporizer temperature detector attached to the side of the vaporizer 44 for detecting the temperature of the vaporizer 44, and is formed of a thermistor and a thermocouple.

The controller 28 controls the vaporizer temperature detector 49.
The electric heater 47 is turned on and off from the signal of (1) to maintain the vaporizing section 44 at a predetermined temperature. The control unit 28
The fuel supply means 8 and the impeller 21 are controlled in an appropriate state according to the instruction of the operation switch and the magnitude of the load, and the fuel and the air supplied to the vaporizing section 44 are adjusted. The fuel injection port 45 has its tip facing the exhaust passage 37 at a portion located upstream of the swirl port 39 provided in the swirl cylinder 38.

The other end of the fuel ejection pipe 45 communicates with the vaporization section 44. Fuel outlet 45 is preferably made of ceramic, steel,
Titanium heat-resistant material is used. The air pipe 46 communicates with the air chamber 16 of the burner 10 and supplies an amount necessary for pushing out the vaporized fuel from the vaporizing section 44 to the exhaust passage 37. The fuel supply pipe 46 supplies fuel from the fuel supply means 8 to the vaporization section 44 via a switching valve 50 provided in the oil supply pipe 12. The switching valve 50 is provided by the control unit 28 so as to be opened when the exhaust gas processing unit 42 operates. The switching valve 50 particularly has a configuration in which the valve is opened and closed by a motor. When the switching valve 50 is opened, the rotary atomizer 11 and the vaporizer 44 of the burner 10 are opened.
The total amount of the fuel sent to the burner 10 is supplied from the fuel supply means 8, and if the combustion amount of the burner 10 decreases,
The fuel that is sent to is also controlled to decrease.

Reference numeral 51 denotes an in-furnace temperature detector which is installed on the side wall 30 of the furnace 29 and measures the temperature in the furnace 29. The in-furnace temperature detecting unit 51 particularly uses a thermistor and a thermocouple.
In response to the value of the in-furnace temperature detecting unit 51, the control unit 28 controls the fuel supply means 8 and the impeller 21 to an appropriate state to adjust the combustion amount of the burner 10 and the air amount corresponding thereto, and the furnace 29 Is set to a predetermined value.

Reference numeral 52 denotes a fuel tank, which communicates with the constant oil level device 9 via a communication pipe 53. In the fuel tank 44,
It is provided so as to be able to store more fuel than can be fired (oxidation, reduction, etc.) at least once.

Numeral 54 denotes an exterior, in which fuel supply means 8 is provided.
The burner 10, the blowing means 22, and the furnace 29 are arranged. The exterior 54 is made of a metal plate or stainless steel as a material. The exterior 54 is reinforced with unevenness and a reinforcing plate so as to withstand the heavy objects of the burner 10 and the furnace 29.

Reference numeral 55 denotes a top plate of the exterior 54, which is provided with an opening / closing door 56 so that the loading / unloading section 34 of the furnace 29 can be opened and closed. The top plate 55 is provided with an exhaust portion 57 communicating with the exhaust passage 37, and the inside of the exhaust passage 37 and the exhaust portion 57 is made of a heat-resistant heat-insulating material such as ceramics or bricks of alumina or silica. . An exhaust top 58 is provided at the end of the exhaust unit 57 to disperse the high-temperature gas to lower the temperature. Also, on the top plate 55,
A supply door 60 for opening and closing a cap 59 for supplying fuel to the fuel tank 52 is provided. In addition, the exterior 54 is provided with an air supply port 61 communicating with the air intake 19 of the burner 10.

Reference numeral 62 denotes a flame formed on the flame outlet 24. 63 is a flow of the combustion gas. 64 is a swivel cylinder 3
8 is a secondary combustion flame formed around 8.

With respect to the firing furnace configured as described above,
The operation and operation will be described below. First, when a power supply (not shown) is turned on, the heater 26 is energized and the vaporizer 13 is heated. When the vaporizer 13 reaches a predetermined temperature, the vaporizer temperature is detected by the vaporizer temperature detector 27, the motor 20 is operated by the instruction of the controller 28, and the impeller 21 of the blower chamber 17 is rotated to supply the combustion air. You. At the same time, the fuel supply means 8 operates, and fuel (kerosene or light oil) is supplied from the oil feed pipe 12 to the rotary atomization unit 11. The fuel is the rotary atomizer 11
Is sprayed onto the wall surface of the high-temperature vaporizer 13 and vaporized on the wall surface. The combustion air is supplied into the vaporizer 13 through the vaporization air port 15, and is mixed with the vaporized fuel to be sent to the flame port 24 as a uniform combustible mixture. A part of the combustion air is supplied into the combustion cylinder 23 through the secondary air port 25.

At this time, the flammable mixture ejected from the flame port 24 is ignited by an ignition electrode (not shown) which has previously performed a spark discharge, and a flame 62 is formed to start combustion. Thereafter, the heat of the flame 62 is sent to the furnace 29, and the temperature inside the furnace 29 is measured by the furnace temperature detecting unit 51, and the temperature is adjusted to a predetermined time and a predetermined temperature for firing the ceramic work 33. For this purpose, the control unit 28 controls the amount of fuel supplied to the carburetor 13 and the amount of combustion air sent to the burner 10 to perform firing.

The maximum firing temperature in the furnace 29 is about 1250 to 130 for the main firing of ceramics (including oxidation firing and reduction firing).
0 ° C, about 750 to 800 ° C for unglazed.

Here, when the exhaust gas treatment controls the amount of fuel and the amount of combustion air in order to perform the reduction firing of the pottery work 33, if the air ratio is reduced below the theoretical air amount, poor combustion occurs and a large amount of This produces carbon monoxide and soot, which removes oxygen from the iron and copper oxides in the glaze and produces a color unique to reduction firing. At this time, the concentration of carbon monoxide is about 2 to 6%.

In the exhaust gas treatment section 42, before performing the reduction firing, the control section 28 supplies electricity to the heater 48 of the vaporization section 44 of the fuel supply section 43 to heat the vaporization section 44. When the vaporizing section 44 reaches a predetermined temperature, the temperature is detected by a vaporizing section temperature detecting section 49, and a heater 48 is turned on and off to keep the vaporizing section 44 at a temperature at which fuel can be vaporized. Air is supplied from the air chamber 16 of the burner 10 via the air pipe 46. The switching valve 50 is operated according to an instruction from the control unit 28, and a part of the fuel supplied by the fuel supply unit 8 to the burner 10 is supplied to the vaporization unit 44 via the fuel supply pipe 46. At this time, the fuel supply means 8 supplies the fuel in accordance with the instruction of the control unit 28 in accordance with the combustion amount of the burner 10 and the amount of fuel supplied to the fuel supply unit 43.
The fuel vaporized in the vaporization section 44 is mixed with air to form a vaporized gas, and is discharged from the fuel discharge pipe 45 into the exhaust passage 37. Further, swirling air is supplied from the air chamber 16 of the burner 10 to the exhaust passage 37 from the swirl opening 39 of the swirl cylinder 38 via an air passage, and this air mixes with the vaporized gas to form a combustible air-fuel mixture. The fuel is ignited by the high-temperature combustion gas 63 at the time of oxidation firing performed before firing, so that the secondary combustion flame 64 is kept in flame at the swirl port 39.

Here, when the reduction firing is performed, when the combustion gas 63 having poor combustion flows into the exhaust passage 37, the combustion gas 63 is heated by the secondary combustion flame 64 formed in the swirl port 39 in advance. Further, the secondary combustion flame 64 makes the combustion gas 63 uniform while turning in the exhaust passage 37,
Promotes exhaust gas treatment.

As described above, in the present embodiment, the exhaust gas processing section 42 for supplying swirling air and fuel and secondary burning the combustion gas 63 during reduction firing is provided in the middle of the exhaust passage 37. The combustion flame 63 heats, incinerates, and reburns the combustion gas 63 by the combustion flame 64, thereby preventing generation of not only smoke but also odor and carbon monoxide.

Since the fuel is supplied together with the air to form a combustion field in the exhaust passage 37 in advance, even if the amount of carbon monoxide fluctuates due to a change in the reduction state, the amount required for exhaust gas treatment is reduced.
The next combustion flame 63 can always be formed.

Further, since the burner 10 and the exhaust gas processing unit 42 can be controlled integrally by the control unit 28, the distribution and amount of air and fuel can be set as instructed. it can.

Further, the exhaust gas processing section 42 can ignite the mixture of swirling air and fuel by the combustion gas 63 at the time of oxidation firing before the reduction firing, so that it can have a simple configuration without using an ignition device.

Further, since the secondary combustion flame 64 is swirled in the exhaust passage 37, the unprocessed passage of the combustion gas 63 can be prevented, and the generation of smoke, odor and carbon monoxide can be surely prevented.

In this embodiment, the fuel supply unit 43
Instead of the vaporized fuel from the fuel ejection pipe 45, gaseous fuel may be supplied at room temperature. As the gaseous fuel, city gas, propane or butane may be used.

(Embodiment 2) FIG. 2 is a sectional view showing an exhaust gas treatment apparatus according to Embodiment 2 of the present invention. In FIG. 2, 1
0 is a burner, 16 is an air chamber, 28 is a control unit, 37 is an exhaust passage, 38 is a revolving cylinder, 39 is a revolving port, 41 is an air passage,
42 is an exhaust gas processing unit, 64 is a secondary combustion flame, 65 is an atomized fuel supply means using an electromagnetic pump, 66 is an atomized fuel supply pipe, 67 is a spray nozzle using a simplex nozzle,
Reference numeral 68 denotes spray particles, which differ from the first embodiment in that the exhaust gas processing unit 42 atomizes the fuel and supplies it to the exhaust passage 37.

The operation and operation of the exhaust gas treatment apparatus configured as described above will be described below. In the exhaust gas processing section 42, the atomizing fuel supply means 65 communicated with the constant oil level device 9 by the control section 28 is operated, and the fuel is supplied to the spray nozzle 67 via the atomization fuel supply pipe 66 and the exhaust passage is provided. 37, and sprays out as spray particles 68. At this time, according to the instruction of the control unit 28, the atomized fuel supply means 65
The amount of fuel corresponding to the combustion amount of the burner 10 is determined by the spray nozzle 67.
To supply it. The air chamber 1 of the burner 10
6 through the air passage 41, through the swivel port 39 of the swivel cylinder 38.
Supplies swirling air to the exhaust passage 37. The sprayed fuel mixes with the swirling air to form a uniform vaporized gas, forms a combustible air-fuel mixture, and is ignited by the high-temperature combustion gas 63 during the oxidation firing performed before performing the reduction firing. At 39, the secondary combustion flame 64 is kept in flame.

As described above, in this embodiment, the swirling air and the fuel are uniformly mixed with the simple structure of the spray nozzle 67 to stably form the secondary combustion flame 64, and not only smoke but also odor and monoxide Generation of carbon can be prevented. Further, since the fuel supply means 8 and the atomized fuel supply means 65 of the burner 10 are separately provided, the control unit 28 can simplify the control by performing each control individually.

(Embodiment 3) FIG. 1 is a sectional view showing an exhaust gas treatment apparatus according to Embodiment 3 of the present invention. In FIG. 1, 1
0 is a burner, 22 is a blower, 28 is a control unit, 29 is a furnace, 37 is an exhaust passage, 42 is an exhaust gas treatment unit, 43 is a fuel supply unit, and 50 is a switch having a plurality of valve bodies (for example, a three-way valve). Valve, 51 is a furnace temperature detecting section, 63 is a combustion gas,
Numeral 64 denotes a secondary combustion flame, which is different from the first embodiment in that the exhaust gas processing unit 42 grasps the temperature in the furnace 29 and adjusts the supply amount of fuel, so that combustion adapted to the state of the combustion gas 63 is performed. This is the point at which an amount of secondary combustion flame 64 is formed.

The operation and operation of the exhaust gas treatment apparatus configured as described above will be described below. In accordance with an instruction from the control unit 28, the temperature in the furnace 29 is detected by the furnace temperature detection unit 5.
1, the control unit 28 changes the release ratio of the switching valve 50 stepwise by the control unit 28, assuming a reduction state based on the change in the temperature and the amounts of fuel and air supplied to the burner 10. The fuel supply amount of the supply unit 43 is changed so that an optimum secondary combustion flame 64 is formed in the exhaust passage 37. In the reduction firing, since the amount of carbon monoxide and the temperature of the combustion gas 63 differ depending on the strength of the reduction, the fuel supply unit 43 supplies an amount of fuel that can form the secondary combustion flame 64 in the exhaust passage 37 in accordance with the change. To supply. In addition, while performing reduction firing, the inside of the furnace 29 controls the increase in the combustion amount of the burner 10 and the air supply from the blowing means 22 by the control unit 28 in order to raise the temperature of 900 to 1200 ° C. I have. For example, in the case of the strong reduction, poor combustion deteriorates, the temperature of the combustion gas 63 also decreases, and the capacity of the secondary combustion flame 64 is increased to compensate for the deterioration.

As described above, in this embodiment, the amount of fuel in the exhaust gas treatment section 42 is adjusted to an appropriate value in accordance with the state of the reduction firing, so that the amount of fuel required for processing the combustion gas 63 is reduced. The secondary combustion flame 64 is formed, so that generation of not only smoke but also odor and carbon monoxide can be prevented.

In this embodiment, the fuel supply unit 43
Is supplied by a single pulse pump, a cylinder pump, an electromagnetic pump,
Fuel supply means constituted by a rotary pump may be provided.

(Embodiment 4) FIG. 3 is a sectional view showing an exhaust gas treatment apparatus according to Embodiment 4 of the present invention. In FIG. 3, 1
0 is a burner, 22 is a blower, 28 is a control unit, 38 is a swivel cylinder, 41 is a blower passage, 42 is an exhaust gas treatment unit, 43 is a fuel supply unit, 63 is a combustion gas, 64 is a secondary combustion flame, 69
Is a supply unit. The supply unit 69 is configured to operate a damper or a cam with a motor or a stepping motor to change the passage resistance of the air passage 41. The difference from the first embodiment is that the exhaust gas treatment unit 42 includes a supply unit 69 that varies the amount of swirling air and the amount of air sent to the fuel supply unit 43 in the middle of the ventilation passage 41 communicating with the ventilation unit 22 of the burner 10. By providing the air distribution, 2 of the air distribution according to the state of the combustion gas 63 is
The point is that the next combustion flame 64 is formed.

The operation and operation of the exhaust gas treatment apparatus configured as described above will be described below. The control unit 28 controls the amount of fuel in the burner 10 and the amount of combustion air to perform the reduction firing of the ceramic work 33,
When the air ratio is reduced below the theoretical air amount, combustion failure occurs, and a large amount of carbon monoxide and soot are generated.The carbon monoxide deprives the iron and copper oxides in the glaze of oxygen, which is characteristic of reduction firing. Perform color development. At this time, the concentration of carbon monoxide is 2
About 6%. In addition, since it is necessary to change the ratio of air introduced into the burner 10 and the swirl cylinder 38 of the exhaust gas treatment section 42 depending on the strength of the reduction, in the case of the strong reduction, the combustion sent to the burner 10 to increase the generation of carbon monoxide is performed. The air volume of
The number of revolutions of the impeller 21 of the blower chamber 17 is reduced and decreased.

However, as it is, the amount of air sent from the air chamber 16 to the swirl cylinder 38 also decreases. Therefore, the supply unit 69 is operated by the instruction of the control unit 28 to reduce the passage resistance of the air passage 41 and increase the amount of swirl air. Then, exhaust gas treatment is performed by promoting secondary combustion in accordance with the increased carbon monoxide. In the case of weak reduction, the amount of carbon monoxide is reduced more than in the case of strong reduction. Therefore, the air sent to the burner 10 is slightly increased, and the air sent to the exhaust gas treatment section 42 is slightly reduced, so that the exhaust gas is processed. At this time, the air sent to the fuel supply unit 43 is controlled by the control unit 28, and the fuel adjusted to the reduced state is jetted from the vaporization unit 44 to the exhaust passage 37 to form the secondary combustion flame 64.

As described above, in this embodiment, the bar
In addition to the variable air amount depending on the number of revolutions of the impeller 21 of the blower means 22 of the burner 10, the supply unit 69 changes the ratio of the air amount of the burner 10, the swirl cylinder 38, and the fuel supply unit 43 in accordance with the intensity of the reduction. Therefore, a more appropriate amount of air can be supplied to the exhaust gas treatment section, and the treatment capacity can be improved.

(Embodiment 5) FIG. 4 is a sectional view showing an exhaust gas treatment apparatus according to Embodiment 5 of the present invention. In FIG. 4, 2
8 is a control unit, 37 is an exhaust passage, 42 is an exhaust gas treatment unit, 4
3 is a fuel supply unit, 44 is a vaporization unit, 45 is a fuel ejection port, 6
Reference numeral 3 denotes a combustion gas, and 69 denotes a supply unit. The difference from the first embodiment is that the exhaust gas processing unit 42 constantly supplies air to the fuel supply unit 43 so that the high-temperature combustion gas 63 from the fuel supply unit 43 is supplied. The point is to prevent backflow.

The operation and operation of the exhaust gas treatment apparatus configured as described above will be described below. When the reduction firing is not performed, the secondary combustion is not performed because no carbon monoxide is generated.
The supply unit 69 is operated in accordance with an instruction from the control unit 28 so that a small amount of air flows out even during combustion other than reduction firing such as oxidation firing so as not to flow back from the fuel outlet 45 to the vaporization unit 44. I have. High temperature combustion gas 6 from the fuel injection port 45
3 is prevented from flowing back into the exhaust gas treatment device. Further, since the fuel ejection port 45 of the fuel supply unit 43 is always cooled by air, corrosion and deformation due to high temperature are prevented.

As described above, in the present embodiment, the backflow of the high-temperature combustion gas 63 can be prevented, the high-temperature corrosion and thermal deformation of the fuel supply unit 43 can be prevented, and the exhaust gas treatment device can be prevented from being damaged.

(Embodiment 6) FIG. 3 is a sectional view showing an exhaust gas treating apparatus according to Embodiment 6 of the present invention. In FIG. 3, 8
Is a fuel supply means, 10 is a burner, 28 is a control unit, 37
Is an exhaust passage, 38 is a swirl cylinder, 39 is a swirl opening, 42 is an exhaust gas treatment unit, 43 is a fuel supply unit, 44 is a vaporization unit, 45 is a fuel injection port, 46 is a fuel supply pipe, 50 is a switching valve, 63
Is a combustion gas, and 64 is a secondary combustion flame. The difference from the first embodiment is that the exhaust gas processing unit 42 forms the secondary combustion flame 64 before the exhaust gas processing of the combustion gas 63 is performed, so that the combustion gas 63 The point is that unprocessed passage is prevented.

The operation and operation of the exhaust gas treatment apparatus configured as described above will be described below. In the exhaust gas processing section 42, the switching valve 50 is operated by the instruction of the control section 28 during the oxidation firing before performing the reduction firing, and a part of the fuel supplied by the fuel supply means 8 to the burner 10 is supplied through the fuel supply pipe 46. It is supplied to the vaporizing section 44. At this time, the fuel supply means 8 supplies the fuel in accordance with the instruction of the control unit 28 in accordance with the combustion amount of the burner 10 and the amount of fuel supplied to the fuel supply unit 43. The fuel vaporized in the vaporization section 44 is mixed with air to form a vaporized gas, and is discharged from the fuel discharge pipe 45 into the exhaust passage 37. Further, swirling air is supplied from the air chamber 16 of the burner 10 to the exhaust passage 37 from the swirl opening 39 of the swirl cylinder 38 through the air passage 41, and this air mixes with the vaporized gas to form a combustible air-fuel mixture. It is ignited by the high-temperature combustion gas 63, and the secondary combustion flame 6
4 is formed.

Here, when the reduction firing is performed, when the combustion gas 63 with poor combustion flows into the exhaust passage 37, the combustion gas 63 is heated by the secondary combustion flame 64 previously formed in the swirl port 39, Further, the secondary combustion flame 64 makes the combustion gas 63 uniform while turning in the exhaust passage 37,
Promotes exhaust gas treatment.

As described above, in the present embodiment, the secondary combustion flame 64 is formed in the exhaust passage 37 before the reduction calcination, and the untreated passage of the combustion gas 63 is prevented. By burning, it is possible to prevent not only generation of smoke but also generation of odor and carbon monoxide.

Before the reduction firing, the secondary combustion flame 64 is used.
Therefore, ignition can be reliably performed during stable combustion.

Further, the secondary combustion flame 64 is formed for a predetermined time before the reduction firing, and the temperature in the exhaust passage 37 is increased, so that the exhaust gas treatment performance can be improved.

Since fuel is supplied together with the air to form a combustion field in the exhaust passage 37 in advance, even if the amount of carbon monoxide fluctuates due to a change in the reduction state, the amount of carbon monoxide required for exhaust gas treatment is reduced.
The next combustion flame 63 can always be formed.

(Embodiment 7) FIG. 3 is a sectional view showing an exhaust gas treating apparatus according to Embodiment 7 of the present invention. In FIG. 3, 1
0 is a burner, 22 is a blower, 28 is a control unit, 37 is an exhaust passage, 38 is a revolving cylinder, 41 is a blower passage, 42 is an exhaust gas treatment unit, 43 is a fuel supply unit, 51 is a furnace temperature detection unit, 6
3 is a combustion gas, 64 is a secondary combustion flame, 69 is a supply unit,
The difference from the first embodiment is that the exhaust gas processing unit 42 forms the secondary combustion flame 64 for a predetermined time during stable combustion after the processing of the combustion gas 63 is completed.

The operation and operation of the exhaust gas treatment apparatus configured as described above will be described below. When the reduction firing is completed, the inner wall of the exhaust passage 37 and the revolving cylinder 38
Is removed by forming a secondary combustion flame 64. At this time, the control unit 28 sets the furnace temperature detection unit 51
By controlling the blowing means 22 and the supply section 69 of the burner 10 while grasping the temperature of the
Is sent to the fuel supply unit 43. Here, the stable combustion is 1 to 2
Due to the time, the same or more air flows as during the exhaust gas treatment to facilitate soot removal.

As described above, in the present embodiment, the soot attached to the exhaust passage 37 and the swirl cylinder 38 is removed by burning, so that the discharge of soot to the outside can be prevented.

(Eighth Embodiment) FIG. 5 is a sectional view showing an exhaust gas treating apparatus according to an eighth embodiment of the present invention. In FIG. 5, 3
7 is an exhaust passage, 38 is a revolving cylinder, 39 is a revolving port, 42 is an exhaust gas treatment unit, 43 is a fuel supply unit, 45 is a fuel outlet, 6
3 is a combustion gas, 64 is a secondary combustion flame, 70 is a through hole, 71
Is an auxiliary combustion cylinder, 72 is an introduction passage, and 73 is a recirculation flow.
Around the periphery of the auxiliary cylinder 71 having a plurality of through holes 70,
By supplying the combustion gas 63 and the fuel inside the auxiliary combustion cylinder 71, the temperature of the combustion gas 63 is increased by the recirculation flow 73 of the secondary combustion flame 64.

The operation and operation of the exhaust gas treatment apparatus configured as described above will be described below. The combustion gas 63 flowing into the exhaust passage 37 is guided from the introduction passage 72 to the auxiliary combustion cylinder 71, and is pushed by the secondary combustion flame 64 formed in the swirl cylinder 38 when exhausted from the auxiliary combustion cylinder 71, thereby causing the auxiliary combustion cylinder 7.
The recirculation flow 73 flows again into the auxiliary combustion cylinder 71 from the first through hole 70 and is sent to the secondary combustion flame 64 while maintaining the combustion gas 63 at a high temperature to promote the secondary combustion. At this time, the fuel under vaporization is supplied into the auxiliary combustion cylinder 71 from the fuel injection port 45 of the fuel supply unit 43 and mixed with the combustion gas 63 to increase the amount of combustion of the secondary combustion flame 64 to promote the secondary combustion. I have.

As described above, in the present embodiment, the combustion gas 63 and the fuel are heated by the recirculation flow 73 and the combustion gas 63 is heated.
The temperature of an air-fuel mixture can be increased to promote secondary combustion and improve exhaust gas treatment performance.

(Embodiment 9) FIG. 6 is a sectional view showing an exhaust gas treating apparatus according to Embodiment 9 of the present invention. In FIG. 6, 3
7 is an exhaust passage, 38 is a swivel cylinder, 42 is an exhaust gas treatment section, 6
3 is a combustion gas, 64 is a secondary combustion flame, and 74 is a burner.
However, a burner ring 74 for reducing the cross-sectional area of the exhaust passage 37 is provided downstream of the swivel cylinder 38. The burner ring 74 is made of a heat-resistant material such as a ceramic and has an opening at a substantially center.

The operation and operation of the exhaust gas treatment apparatus configured as described above will be described below. The combustion gas 63 secondary-combusted by the secondary combustion flame 64 formed in the exhaust passage 37 is converged by the burner ring 74,
Further, the combustion gas 63 is retained in the exhaust passage 37 to increase the temperature in the exhaust passage 37 to promote secondary combustion.

As described above, in the present embodiment, the flows of the secondary combustion flame 64 and the combustion gas 63 are made to converge, and the exhaust gas treatment performance can be maintained at a high temperature.

When the burner ring 74 is red-heated, the radiant heat can stabilize the flame holding of the secondary combustion flame 64 and promote the secondary combustion.

(Embodiment 10) FIG. 7 shows Embodiment 1 of the present invention.
It is sectional drawing which shows the exhaust gas processing apparatus of No. 0. In FIG. 7, reference numeral 37 denotes an exhaust passage, 38 denotes a swirl cylinder, 42 denotes an exhaust gas treatment unit, 63 denotes a combustion gas, 64 denotes a secondary combustion flame, and 75 denotes a flame spreader. 42
However, a point that a flame spread plate 75 larger than the outer periphery of the swirl tube 38 is provided at the downstream end of the swirl tube 38 is provided. The flame spreader 75 is
The secondary combustion flame 64 is formed in the exhaust passage 37 by the inverted conical shape.
It is provided so as to spread gradually.

The operation and operation of the exhaust gas treatment apparatus configured as described above will be described below. The secondary combustion flame 64 formed in the swirl cylinder 38 is spread along the flame spreader 75 and in the exhaust passage 37 so that all the combustion gas 63 can be captured.

As described above, in this embodiment, since all the combustion gas 63 is received by the secondary combustion flame 64,
Secondary combustion of carbon monoxide is ensured, and exhaust gas treatment performance can be improved.

[0081]

As described above, according to the first to tenth aspects of the present invention, the secondary combustion flame is reliably formed during the reduction firing, and the secondary combustion is promoted. Generation of carbon oxide can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an exhaust gas treatment apparatus according to Embodiments 1 and 3 of the present invention.

FIG. 2 is a cross-sectional view illustrating an exhaust passage of an exhaust gas treatment device according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating a secondary combustion fire of an exhaust gas treatment apparatus according to Embodiments 4, 6, and 7 of the present invention.

FIG. 4 is a sectional view of an exhaust gas treatment apparatus according to a fifth embodiment of the present invention.

FIG. 5 is a sectional view showing an auxiliary combustion cylinder of an exhaust gas treatment apparatus according to an eighth embodiment of the present invention.

FIG. 6 is a cross-sectional view showing burner ring of an exhaust gas treatment device according to a ninth embodiment of the present invention.

FIG. 7 is a cross-sectional view illustrating a nuclear flame plate of an exhaust gas treatment apparatus according to Embodiment 10 of the present invention.

FIG. 8 is a cross-sectional view of a conventional exhaust gas treatment device.

[Explanation of symbols]

 10 burner 22 blower means 29 furnace 37 exhaust passage 38 swirl cylinder 41 blower passage 42 exhaust gas treatment unit 43 fuel supply unit 63 combustion gas 64 secondary combustion flame 69 supply unit 70 through hole 71 combustion support cylinder 74 burner ring 75 flame spreader

Continuing from the front page (72) Inventor Toshiro Ogino 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Masanobu Kawai 1006 Okadoma Kadoma, Kadoma City Osaka Pref. 3K062 AA18 AB01 AC19 AC20 BA02 BB02 CB03 DB13 3K065 AA18 AB01 AC19 AC20 GA03 GA07 GA08 GA12 GA23 GA43 GA45 3K078 BA09 BA22 CA04 CA09 CA13 CA18

Claims (10)

[Claims] 1. An exhaust gas treatment apparatus comprising: an exhaust passage for exhausting a combustion gas; and an exhaust gas treatment unit provided in the middle of the exhaust passage for supplying swirling air and fuel and secondary-combusting the combustion gas. 2. The exhaust gas treatment device according to claim 1, wherein the exhaust gas treatment section sprays fuel into an exhaust passage. 3. The exhaust gas treatment device according to claim 1, wherein the exhaust gas treatment unit grasps the temperature in the furnace and adjusts a fuel supply amount. 4. The exhaust gas treatment unit according to claim 1, further comprising a supply unit that varies the amount of swirling air and the amount of air sent to the fuel supply unit in the middle of an air passage that communicates with the air supply unit of the burner. An exhaust gas treatment device as described in the above. 5. The exhaust gas treatment device according to claim 1, wherein the exhaust gas treatment unit constantly supplies air to the fuel supply unit. 6. The exhaust gas processing apparatus according to claim 1, wherein the exhaust gas processing section forms the secondary combustion flame before performing the exhaust gas processing of the combustion gas. 7. The exhaust gas processing apparatus according to claim 1, wherein the exhaust gas processing section forms a secondary combustion flame after the processing of the combustion gas is completed. 8. The exhaust gas treating section according to claim 1, wherein an auxiliary combustion cylinder having a plurality of through holes is provided around the swirling cylinder, and combustion gas and fuel are supplied inside the auxiliary combustion cylinder. 2. The exhaust gas treatment device according to claim 1. 9. The exhaust gas treatment device according to claim 1, wherein the exhaust gas treatment unit is provided with a burner ring on a downstream side of the swirl tube to reduce a cross-sectional area of the exhaust passage. 10. The exhaust gas treatment apparatus according to claim 1, wherein the exhaust gas treatment section is provided with a flame spread plate larger than the outer periphery of the swirl cylinder at an end on the downstream side of the swirl cylinder.