JP2001050508A - Catalyst combustion apparatus with vaporization function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide catalyst combustion apparatus with a vaporization function capable of shortening starting time of catalytic combustion, saving of electric power, and simplifying and miniaturizing an arrangement. SOLUTION: A fuel vaporization section 31 and a catalytic combustion section 6 consists of a power supply heater provided wit many through-holes, and the catalytic combustion section 6 is disposed around the fuel vaporization section 31. The fuel vaporization section 31 and the catalytic combustion section 6 are simultaneously supplied with electric power. The catalytic combustion section 6 is previously heated substantially when a fuel vaporized by permitting the fuel vaporization section 31 to be heated, so that the catalytic combustion is quickly started. Since the fuel vaporization section 31 is heated with combustion heat, fuel vaporization electric power is eliminated. Further, a space occupied by the fuel vaporization section 31 and the catalytic combustion section 6 is reduced together with miniaturization of the catalytic combustion apparatus and simplification of the structure of the catalytic combustion apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalytic combustion device having a function of vaporizing liquid fuel.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open No.
The technique disclosed in Japanese Patent No. 178108 is known.
This technology includes a vaporizer for fuel vaporization and a catalytic combustion unit that burns vaporized fuel, and the vaporizer uses a sheath heater to heat a premix cylinder that forms a premix chamber upstream of the catalytic combustion unit. While heating, the liquid fuel is supplied to the fan that supplies the primary air, and the liquid fuel is scattered by the centrifugal force of the fan to the inner wall of the heated premix cylinder, which is contacted with the premix cylinder and vaporized. The vaporized fuel is supplied to the catalytic combustion section.

[0003]

The technique disclosed in the above publication has the following problems. 1) As means for preheating the catalytic combustion section at the beginning of combustion, flame combustion is performed upstream of a rectifying plate provided upstream of the catalytic combustion section, and the heat is used to preheat the catalytic combustion section. In such a configuration, first, a predetermined time is required for heating the premix cylinder by the sheathed heater, and a predetermined time is required for preheating the catalytic combustion unit by the flame combustion started thereafter. In other words, in order to start catalytic combustion, it takes time to heat the premix cylinder and preheat the catalytic combustion section,
There was a problem that the start of catalytic combustion was delayed.

[0004] 2) The pre-mixing cylinder for fuel vaporization is located away from the catalytic combustion section, and has a structure in which the pre-mixing cylinder is not easily heated by the heat of the catalytic combustion section. For this reason, even when the catalytic combustion is started, it is necessary to always supply a large current to the sheathed heater during the catalytic combustion, and there is a problem that the power consumption is large even during the catalytic combustion.

[0005] 3) Further, since the structure of the premixing cylinder for fuel vaporization and the structure of the catalytic combustion section are completely different and are separately disposed, the structure becomes complicated and the overall catalytic combustion apparatus becomes large.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a vaporization function capable of shortening the start time of catalytic combustion, saving power, simplifying the configuration, and reducing the size. An object of the present invention is to provide a catalytic combustion device.

[0007]

[Means for Solving the Problems] The fuel evaporating section and the catalytic combustion section are current-carrying heating elements having a large number of through-holes, and are defined by evaporating cylinders. At the start of combustion, the fuel evaporator and the catalyst burner generate heat simultaneously. Thereby, when the fuel vaporized by heating the fuel evaporating section reaches the catalytic combustion section, the catalytic combustion section is preheated, so that the catalytic combustion can be started quickly. That is, catalytic combustion can be started more quickly than in the conventional technique.

[0008] The fuel evaporating section and the catalytic combustion section are configured in a block of an electric heating element. For this reason, when catalytic combustion is started, the heat of the combustion heats the fuel evaporator. This eliminates the need to heat the fuel evaporator section by energization during catalytic combustion, or reduces the amount of heating by energization. That is, during the catalytic combustion, the power for fuel vaporization can be eliminated or reduced, so that the power consumption can be reduced.

Further, the fuel evaporating section and the catalytic combustion section include
Because it is configured in the block of the electric heating element,
The space occupied by the fuel evaporation section and the catalytic combustion section can be reduced, and the size of the catalytic combustion apparatus can be reduced. Further, the configurations of the vaporizer including the fuel vaporizing section and the catalytic combustion section are simplified.

[0010] Since the catalytic combustion section has a catalyst carried on the surface of the energizing heating element, the energizing heating element is energized at the beginning of the combustion to generate heat, so that the catalyst is heated at the beginning of the combustion. Can also enhance the action of the catalyst,
As a result, it is possible to reduce the exhaust emission at the beginning of combustion.

According to a third aspect of the present invention, the liquid fuel supplied into the evaporating cylinder is evaporated by energizing the fuel evaporating section in the evaporating cylinder receiving the supply of the liquid fuel to generate heat. It is led to the catalytic combustion section. That is, by using this vaporizer, catalytic combustion can be easily performed even with liquid fuel.

According to the fifth aspect of the present invention, since the porous fuel absorber is disposed on the closed end face of the evaporator cylinder, the fuel absorber receives the heat of combustion and becomes high in temperature, thereby evaporating the absorbed fuel. As a result, evaporation of the liquid fuel in the evaporation cylinder is promoted.

According to a sixth aspect of the present invention, the fuel evaporating section and the catalytic combustion section adopt a two-layer structure with the fuel evaporating section at the center, so that the space occupied by the fuel evaporating section and the catalytic combustion section can be reduced, and the vaporization function can be reduced. The size of the attached catalytic combustion device can be reduced.

In order to guide the primary air supplied to the premixing chamber by the cylinder to the upstream of the premixing chamber,
The mixing property between the primary air and the fuel in the premixing chamber can be improved, and uneven combustion in the catalytic combustion section can be suppressed.

According to a ninth aspect of the present invention, since a swirling flow is given to the primary air supplied to the premixing chamber, the mixing property between the primary air and the fuel in the premixing chamber can be improved, and the catalytic combustion portion Combustion unevenness can be suppressed.

[11] The heat exchange between the combustion gas and the combustion air is performed by the partition separating the combustion gas passage and the air supply passage, so that the heat of the combustion gas can be recovered and the vaporization function can be achieved. The efficiency of the attached catalytic combustion device can be improved.

According to a twelfth aspect of the present invention, since a swirl flow is given to the secondary air supplied to the combustion chamber, the mixing property between the secondary air and the unburned fuel in the combustion chamber can be improved, and the combustion efficiency can be improved. be able to. Further, a part of the combustion gas flows into the secondary combustion part by the swirling flow of the combustion gas, and the exhaust emission can be reduced by the EGR effect. In addition, 2
Since the next combustion is swirled, the volume required for the secondary combustion can be reduced, and the catalytic combustion device with a vaporization function can be downsized.

According to a thirteenth aspect of the present invention, a heat exchange fin is provided between the combustion gas passage and the air supply passage.
The heat recovery efficiency of the combustion gas can be increased, and the efficiency of the catalytic combustion device with a vaporization function can be increased.

According to a fourteenth aspect of the present invention, at least a part of the catalytic combustion portion (electric heating element) is provided at a higher temperature than the other portion, so that the high temperature portion precedes the other portion at the beginning of operation. As a result, the catalytic reaction is quickly started in the high temperature portion, and the ignition is started prior to the other portions. By this ignition, the high-temperature portion plays a role of flame holding, and at the same time, warms the catalyst of the other portion and promotes the catalytic reaction of the other portion. Thus, the combustion device can be started for a short time, and the power consumption at the time of starting can be reduced.

[Means of Claim 15] A high-temperature portion is separated from other portions. By placing the high-temperature portion at an arbitrary position in the catalytic combustion section, the high-temperature portion can be placed at a position suitable for flame holding, or at a position promoting the catalytic reaction of another portion.

A high-temperature portion and another portion can be easily formed by changing the number of strip-shaped heating elements in the high-temperature portion and the other portion.

According to a seventeenth aspect of the present invention, an ignition section is provided at least at a portion downstream of the catalytic combustion section (electric heating element), so that the ignition section precedes other sections at the beginning of operation. Start ignition. This ignition causes the ignition portion to play the role of flame holding, and at the same time, warms the catalyst in other portions and promotes the catalytic reaction in other portions. Thus, the combustion device can be started for a short time, and the power consumption at the time of starting can be reduced.

[Means of Claim 18] At least one part of the upstream side of the catalytic combustion part (electric heating element) is provided with a reaction accelerating part which becomes higher in temperature than other parts, so that it can be used at an early stage of operation. The temperature of the reaction accelerating portion rises before the other portions, and the catalytic reaction is quickly started in the reaction accelerating portion. As a result, the primary combustion and the secondary combustion downstream of the reaction promoting section are quickly stabilized, and as a result, the combustion device can be started for a short time, and the power consumption at the time of starting can be reduced.

[Claim 19] At least one part of the upstream side of the catalytic combustion part (electric heating element) is provided with a reaction accelerating part which becomes higher in temperature than other parts, so that the reaction is accelerated at the beginning of operation. The accelerating part becomes hotter than other parts,
The catalytic reaction is quickly started in the reaction promoting section.
The air-fuel mixture that has undergone a catalytic reaction in this reaction promoting section and has been oxidized is led to the ignition section. In the ignition part, ignition starts before the other parts. However, since the air-fuel mixture oxidized by the reaction promoting part is guided to this ignition part, it is easily ignited. Then, the igniting portion plays a role of flame holding, and at the same time, warms the catalyst of the other portion and promotes the catalytic reaction of the other portion. This makes it possible to start the combustion device for a short time,
Power consumption at startup can be reduced.

The igniting part and the reaction accelerating part are formed by forming one through hole in the belt-shaped heating element, so that the manufacturing is easy and the cost can be reduced.

[Claims 21 to 23] The reaction accelerating portion provided in at least a part of the energized heating element constituting the catalytic combustion portion is provided along the longitudinal direction of the through-hole.
Here, in the case where the reaction promoting portion is provided in a part such as upstream or downstream of the through-hole, the time for the air-fuel mixture passing through the through-hole to pass through the reaction promoting portion is short, and the temperature rise and activation of the air-fuel mixture are reduced. May be insufficient. However, this claim 21 to 23
Since the reaction promoting portion is provided along the longitudinal direction of the through-hole as in the invention of the above-mentioned invention, the time for the mixture to pass through the reaction promoting portion becomes longer. That is, the time during which the air-fuel mixture stays in the reaction promoting section becomes relatively long. Thereby, the temperature rise and activation of the air-fuel mixture are promoted, the ignitability of the air-fuel mixture that has passed through the reaction promoting section is improved, and the ignitability of the catalytic combustion device is improved.

The electric heating element constituting the catalytic combustion section is formed by winding a band-shaped heating element in which a flat plate and a corrugated sheet are joined, and the flat heating element or the corrugated sheet constituting the band-shaped heating element is provided. At least one is thinned to provide a reaction promoting portion. By providing in this way, it is possible to easily manufacture the flat plate and the corrugated plate without complicating the shapes thereof.

According to a twenty-third aspect of the present invention, the notch on the upstream side and the notch on the downstream side of the belt-shaped heating element are provided so as to overlap by winding, and the reaction is performed by the notch regardless of the overlap. The cutting shape can be simplified as compared with the case where the accelerating portion is formed, and the production can be easily performed. Further, the cost can be suppressed by simplifying the cutting shape.

[Means of Claims 24 and 25] Claim 24,
According to a twenty-fifth aspect of the present invention, the ignition portion is provided so as to protrude into the combustion chamber on the downstream side of the catalytic combustion portion. Here, when the ignition portion is provided in a part of the downstream side of the through-hole, the mixing state of the air-fuel mixture supplied to the through-hole in which the ignition portion is formed is poor,
If an air-fuel mixture that is suitable for ignition is not supplied,
There is a problem that the air-fuel mixture does not ignite even after passing through the ignition part. However, as in the invention of claims 24 and 25,
Since the igniting portion is provided so as to protrude into the combustion chamber on the downstream side of the catalytic combustion portion, the igniting portion comes into contact with a large amount of the air-fuel mixture that has passed through many through-holes, and the air-fuel mixture that touches the igniting portion is in front of the once-through gas. Is no longer affected by the mixed state of That is, the air-fuel mixture that touches the ignition portion is a large amount of air-fuel mixture that has passed through many through-holes, the air-fuel mixture is in a good stirring state, and ignition can be stably performed at the ignition portion.

According to a twenty-fifth aspect of the present invention, a belt-shaped heating element constituting an ignition portion and a belt-shaped heating element constituting another portion are separated from each other, and the belt-shaped heating element constituting the ignition portion is separated from another. It is provided so as to protrude into the combustion chamber from a part of the band-shaped heating element. With this arrangement, it is possible to easily manufacture the heating element without complicating the shape of projecting a part of the belt-shaped heating element to the downstream side.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to a plurality of embodiments and modifications. First Embodiment FIGS. 1 to 5 show a first embodiment, and FIG. 1 is a schematic sectional view of a hot water heating device using a catalytic combustion device with a vaporizing function. The upper side in the embodiment indicates the upper side in FIG. 1, and the lower side indicates the lower side in FIG.

The hot water heating apparatus shown in this embodiment employs a multi-pipe structure, and includes a combustion tube 1, an exhaust tube 2, and a hot water tube 3 from the inside. The combustion cylinder 1 is a cylinder that internally burns fuel, and the exhaust cylinder 2 is a cylinder that forms an annular combustion gas passage 4 between the combustion cylinder 1 and an outer air guide cylinder 9 described below. The tube 3 is a tube that forms an annular hot water passage 5 with the exhaust tube 2.

The combustion cylinder 1 is a cylinder made of a heat-resistant metal (stainless steel or the like) composed of an upper (fuel supply side) small-diameter cylinder 1a and a lower (combustion gas discharge side) large-diameter cylinder 1b. The diameter of the small-diameter cylinder 1a and the large-diameter cylinder 1b changes via the step portion 1c. A catalytic combustion section 6 and a carburetor 7 are arranged inside the upper side of the small-diameter cylinder 1a, and around the small-diameter cylinder 1a slightly below the catalytic combustion section 6 and the carburetor 7, the inside of the combustion cylinder 1 is provided. Are formed with a plurality of secondary air blowing ports 8 for allowing secondary air to flow therethrough.

Around the small-diameter cylinder 1a, a large-diameter cylinder 1b
A double cylinder composed of an outer air guide cylinder 9 (corresponding to a partition separating the combustion gas passage 4 and the outer air supply passage 10) having the same diameter as the inner cylinder and an inner air guide cylinder 11 slightly larger in diameter than the small-diameter cylinder 1a. Are located. The outer air supply passage 10 between the outer air guide tube 9 and the inner air guide tube 11 guides the air supplied from the upper side to the turn portion 12 on the upper side of the step portion 1c while exchanging heat with the combustion gas. . Also, an inner air supply passage 13 between the inner air guide cylinder 11 and the small diameter cylinder 1a.
Is for guiding the air turned by the turn section 12 upward.

The primary air supply passage 15 that guides the air to the premixing chamber 14 above the secondary air inlet 8 by the inner air supply passage 13 corresponds to the primary air supply means. 14 is supplied to the premixing chamber 1
The air-fuel ratio is adjusted so that the fuel supply becomes excessive with respect to the fuel supply amount supplied to the fuel cell 4 (the air-fuel ratio is lower than the stoichiometric air-fuel ratio).

On the other hand, the secondary air inlet 8 is
Corresponds to secondary air supply means for supplying secondary air necessary for completely combusting unburned fuel into the combustion chamber 16 on the downstream side of the combustion chamber 16 (inside the combustion cylinder 1 downstream of the secondary air inlet 8). The amount of air supplied from the secondary air inlet 8 into the combustion cylinder 1 is adjusted to an air-fuel ratio (higher than the stoichiometric air-fuel ratio) necessary to completely burn unburned fuel. I have. In this embodiment, the ratio between the primary air supplied to the premixing chamber 14 and the secondary air supplied into the combustion cylinder 1 from the secondary air inlet 8 is set to about 1: 2. ing.

The exhaust pipe 2 is a closed-end cylindrical body whose lower side (downstream of exhaust gas) is closed, and has a gas heat transfer fin 17 formed on the inner surface for transmitting the heat of the combustion gas to the exhaust pipe 2. Water-side heat transfer fins 18 are formed on the outer surface to guide the hot water passage 5 spirally. An exhaust pipe exhaust hole 19 for discharging the combustion gas guided upward by the combustion gas passage 4 to the outside is formed at the upstream end of the exhaust pipe 2.

The hot water cylinder 3 is, like the exhaust pipe 2, a bottomed cylindrical body with the lower side of the combustion cylinder 1 closed, and has a hot water cylinder exhaust hole 20 communicating with the exhaust pipe exhaust hole 19 of the exhaust cylinder 2. I have. A hot water inlet 21 that guides hot water to the hot water passage 5 is formed below the hot water cylinder 3, and a hot water outlet 22 that guides hot water to the outside is formed above the hot water cylinder 3.

The upper sides of the premixing chamber 14, the exhaust pipe 2, and the hot water pipe 3 are closed by an end plate 23. Outside the end plate 23, an air inflow cylinder 26 into which air for combustion is supplied from an air pump 24 via an air inflow port 25 is mounted, and the air supplied into the air inflow cylinder 26 is provided. Is guided to the outside air supply passage 10 through an air supply hole 27 formed in the end plate 23.

On the other hand, inside the end plate 23, the carburetor 7 extending into the small-diameter cylinder 1a of the combustion cylinder 1 is mounted. The vaporizer 7 vaporizes the liquid fuel with heat and then guides the liquid fuel to the premixing chamber 14 upstream of the catalytic combustion unit 6.
The center electrode tube 29 is attached to the device 3 via a plurality of insulating materials 28a and 28b, and the liquid fuel is supplied from the center electrode tube 29 and is insulated and held by the center electrode tube 29 via the insulating material 28c. The fuel cell system includes an evaporating cylinder 30 and a fuel evaporating section 31 that is disposed in the evaporating cylinder 30 and generates heat when energized from the center electrode tube 29. The center electrode tube 29
Has a flow path 29a through which liquid fuel passes at its center.

The lower end of the evaporating cylinder 30 is a closed end face 30a facing the inside of the combustion cylinder 1, and the upper side of the evaporating cylinder 30 has
Fuel injection hole 3 for guiding fuel vaporized inside to premixing chamber 14
2 are provided. The evaporating cylinder 30 is grounded via the catalytic combustion unit 6, the combustion cylinder 1, and the like. When a voltage is applied to the center electrode tube 29, the fuel evaporating unit 31 is energized together with the catalytic combustion unit 6. .

A liquid fuel (for example, light oil) stored in a fuel tank 33 is provided at the upper open end of the flow path 29 a of the center electrode tube 29 so as to be supplied by a fuel pump 34. The lower open end of the flow path 29 a of the center electrode tube 29 inside the evaporating cylinder 30 is closed end face 3 of the evaporating cylinder 30.
0a, and separated by a predetermined distance,
It is insulated from the evaporating cylinder 30. On the other hand, the center electrode tube 29 is provided so as to receive a voltage via the power supply terminal 35. The power supply terminal 35 is disposed so as to penetrate through the air inflow cylinder 26 via an insulating material 36, and is sandwiched by a plurality of fixing nuts 37a and 37b to hold the central electrode tube 29.
It is fixed to.

The fuel evaporating section 31 is provided in a substantially honeycomb shape having a large number of through-holes. As shown in FIG. Heat generating flat plate 38a and corrugated plate 38
A thin insulating layer of alumina or the like is provided on the surfaces of the pair of metal foils b (for example, 50 μm in thickness), and the insulating layer is wound around the center electrode tube 29. The fuel evaporator 3
One through-hole is formed between the flat plate 38a and the corrugated plate 38b. A honeycomb formed by the flat plate 38a and the corrugated plate 38b is schematically shown in FIG. 2 (b).

The catalytic combustion section 6 is arranged between the small diameter cylinder 1a and the evaporation cylinder 30. The catalytic combustion unit 6 includes a catalyst (noble metal such as Pt, Pd, Rn, etc.) that promotes ignition combustion and a partial oxidation reaction on the surface of an energized heating element which is provided in a substantially honeycomb shape having a large number of through holes and generates heat by energization. N
i, metals such as Cu, oxides such as alumina and zirconia)
Is carried. Furthermore, a partial oxidation reaction is possible even if an oxide layer of alumina or the like forming the insulating layer is used as it is. Therefore, the catalyst of the present invention refers to the metal and the oxide layer.

More specifically, as shown in FIG. 3B, for example, a pair of metal foils (for example, 50 μm thick) of a flat plate 38 a and a corrugated plate 38 b which generate heat due to a current-carrying resistance made of, for example, Fe—Cr—Al ferritic stainless steel. ), A thin insulating layer such as alumina is provided on the surface, and a plurality of catalysts supporting Pt, Pd or the like are wound around the evaporating cylinder 30. A large number of through-holes of the catalytic combustion section 6 are
8a and the corrugated plate 38b. The inside of the catalytic combustion section 6 is connected to the evaporating cylinder 30, and the outside is connected to the combustion cylinder 1 via the outer peripheral electrode 39. It is provided so as to generate heat.

The energization control of the fuel evaporator 31 and the catalytic combustion unit 6 and the energization control of the air pump 24 and the fuel pump 34 are performed by the control device 40 shown in FIG. The control device 40 includes, in addition to the manually operated operation switch 41, a water temperature sensor 42 for detecting the temperature of hot water in the hot water passage 5, and an exhaust temperature sensor 4 for detecting the temperature of combustion gas in the combustion gas passage 4.
When the operation temperature of the water temperature sensor 42 is lower than the operation start temperature in a state where the operation switch 41 is turned on, fuel combustion is started, and when the operation switch 41 is turned off or the temperature detected by the water temperature sensor 42 is When the temperature is higher than the operation stop temperature, the combustion of the fuel is stopped. Further, the control device 40 is provided so as to increase or decrease the amount of combustion based on the temperature detected by the water temperature sensor 42.

[Operation of Embodiment] FIG.
A description will be given based on the time chart of FIG. Operation switch 41
Is turned on, and if the temperature detected by the water temperature sensor 42 is lower than the operation start temperature, combustion is started. First, the air pump 24
The fuel pump 34 is operated at a low speed suitable for ignition, and the fuel evaporator 31 and the catalyst burner 6 are energized.

When the fuel evaporator 31 is energized,
The liquid fuel supplied into the evaporating cylinder 30 is heated and evaporated in the fuel evaporating section 31, and is ejected from the evaporating cylinder 30 into the premixing chamber 14. In addition to the vaporized fuel, primary air is supplied to the premixing chamber 14, mixed appropriately, and led to the catalytic combustion unit 6.

The catalytic combustion section 6 is also energized and generates heat.
As the catalyst is activated, the air-fuel mixture supplied from the premixing chamber 14 is ignited and burned. The combustion in the catalytic combustion unit 6
Since the primary air is insufficient, the unburned fuel is completely burned by the secondary air supplied from the secondary air inlet 8 into the combustion cylinder 1. Even in the early stage of the operation, the unburned gas is activated and the partial oxidation reaction is promoted by the action of the catalyst, so that the exhaust emission can be reduced even at the start.

When ignition is confirmed by the detected value of the exhaust gas temperature sensor 43 (t1), the air pump 24 and the fuel pump 34 are gradually shifted to a steady operation. Thereafter, when the value detected by the exhaust gas temperature sensor 43 reaches a predetermined temperature (t2), the energization of the fuel evaporator 31 and the catalytic combustor 6 is stopped. In this embodiment, the ignition value is confirmed by the detection value of the exhaust gas temperature sensor 43, and the fuel evaporator 31 and the catalytic combustor 6 are used.
Was stopped, but it may be performed by timer control.

By the time the energization of the fuel evaporator 31 and the catalytic combustion unit 6 is stopped, the temperature of the fuel evaporator 31 and the catalytic combustor 6 is high even if they are not energized due to the transmission of the heat generated by the combustion. Therefore, the liquefied fuel supplied into the evaporating cylinder 30 evaporates and evaporates, and the air-fuel mixture passing through the catalytic combustion unit 6 is catalytically burned.

Even if the operation mode shifts to the steady operation, the air-fuel mixture supplied from the premixing chamber 14 to the catalytic combustion unit 6 is in excess of the stoichiometric air-fuel ratio and the combustion temperature in the catalytic combustion unit 6 is low (for example, (About 600 ° C.). Since this temperature is lower than the heat-resistant temperature of the catalyst (for example, 900 ° C.), the deterioration of the catalyst supported on the catalytic combustion unit 6 is prevented. In addition, the excess fuel-air mixture passing through the catalytic combustion unit 6 is transformed into a high-temperature activated gas by a partial oxidation reaction caused by catalytic combustion in the catalytic combustion unit 6.

Secondary air is supplied from the secondary air inlet 8 to the high-temperature activated gas that has passed through the catalytic combustion section 6 and has been denatured, and unburned fuel is burned. The supply amounts of the primary air and the secondary air with respect to the fuel supply amount supplied to the combustion cylinder 1 are as follows:
The total air-fuel ratio is 17.5 to 29.2 (air excess ratio 1.2 ≦
The fuel is completely burned in the combustion cylinder 1 (in the combustion chamber 16) downstream of the secondary air inlet 8 in the fuel cell 2).

The high-temperature combustion gas generated in the combustion cylinder 1 is
It turns at the bottom of the exhaust pipe 2, flows along the inner surface of the exhaust pipe 2, and heats the hot water flowing through the hot water passage 5 via the gas heat transfer fins 17, thereby exhausting the exhaust pipe exhaust hole 19 and the hot water cylinder exhaust hole 20.
Is discharged to the outside through On the other hand, hot water is supplied to the hot water inlet 2
1 is heated into the hot water passage 5 through the water-side heat transfer fins 18 and exchanges heat with the combustion gas to be heated. The heated hot water is sent to a heater core of an air conditioner by a hot water pump (not shown) and exchanges heat with air passing through the heater core, thereby heating the vehicle interior.

When the operation switch 41 is turned off, the fuel pump 34 is immediately stopped, and the supply of fuel is stopped.
On the other hand, the operation of the air pump 24 is continued for a predetermined time t4 to burn the remaining fuel and perform a cooling operation (post-purge operation) inside the combustion cylinder 1. And
After a predetermined time t4, the air pump 24 also stops, and all functions stop.

[Effects of the Embodiment] Each of the fuel evaporator 31 and the catalytic combustor 6 is constituted by an electric heating element having a large number of through holes, and the catalytic combustor 6 is arranged around the fuel evaporator 31. When the combustion starts, the fuel evaporator 31 and the catalytic combustor 6 are simultaneously energized and generate heat. Thus, when the fuel vaporized by heating the fuel evaporating section 31 reaches the catalytic combustion section 6, the catalytic combustion section 6 is almost preheated, so that the catalytic combustion in the catalytic combustion section 6 can be started quickly. it can.

Since the structure in which the catalytic combustion section 6 is disposed around the fuel evaporating section 31 is employed, when the catalytic combustion is started, the fuel evaporating section 31 is heated by the combustion heat. This eliminates the need to heat the fuel evaporator 31 by energization during catalytic combustion. That is, during the catalytic combustion, the power for fuel vaporization can be eliminated, so that the power consumption during the steady operation can be reduced.

Since the structure in which the catalytic combustion section 6 is disposed around the fuel evaporating section 31 is adopted, the fuel evaporating section 31
In addition, the space occupied by the catalytic combustion section 6 can be reduced, the catalytic combustion device can be downsized, and the structure of the catalytic combustion device can be simplified.

Since the catalytic combustion section 6 performs low-temperature combustion due to insufficient air supply, overheating of the catalyst is prevented, and stable catalytic combustion can be performed for a long period of time. In addition, the catalyst combustion unit 6 has only one stage, and adopts a simple configuration in which the unburned fuel activated by the catalyst is completely burned in the combustion tube 1 downstream of the catalyst combustion unit 6. The combustion device can be reduced in size and cost can be reduced. In order to adopt a structure in which heat exchange is performed between the combustion gas and the combustion air through the outer air guide cylinder 9 to heat the combustion air,
Heat recovery of the combustion gas can be performed, and the efficiency of the catalytic combustion device can be improved.

[Second Embodiment] FIGS. 6 and 7 show a second embodiment. In the second embodiment, the combustion startability at a low temperature is further improved compared to the first embodiment. In the second embodiment, the energizing heating element constituting the catalytic combustion section 6 is provided with a large diameter, and the energizing heating element is also arranged in the primary air supply passage 15 to form an air heating section 44. This is provided so as to heat the supplied primary air. In addition, the air heating unit 44 arranged in the primary air supply passage 15
The catalytic combustion section 6 is functionally divided, but has the same honeycomb shape in terms of configuration, and is connected to the inner air guide cylinder 11 via the outer peripheral electrode 39. Thereby, the air passing through the primary air supply passage 15 at the time of starting is heated, and the mixing with the vaporized fuel in the premixing chamber 14 is promoted, and the combustion startability is improved. Note that the same reference numerals as in FIG. 1 indicate the same configuration as in FIG.

[Third Embodiment] FIG. 8 shows a third embodiment. In the third embodiment, the bottom (closed end face 3)
0a), a fuel absorber 45 made of a porous metal material is disposed, and an insulating material 46 is disposed between the fuel absorber 45 and the center electrode tube 29. The fuel absorber 45 is
It is a metallic material excellent in heat transfer, and is formed by laminating a wire net of a foamed metal such as stainless steel or a heat-resistant metal. The insulating material 46 ensures insulation between the fuel absorber 45 and the center electrode tube 29, and is made of asbestos or porous ceramic through which the fuel vaporized by the fuel absorber 45 can easily pass. Note that the fuel absorber 45 may be made of porous ceramic and the insulating material 46 may be omitted. Combustion starts,
When the heat from the combustion is transmitted to the fuel absorber 45, the evaporation of the fuel absorbed by the fuel absorber 45 is promoted, and as a result, the vaporization ability of the vaporizer 7 can be improved. Note that the same reference numerals as those in FIG. 2A indicate the same configurations as those in FIG.

[Fourth Embodiment] FIG. 9 shows a fourth embodiment. In the fourth embodiment, the small-diameter cylinder 1a of the combustion cylinder 1 is extended to the upstream side, and the cylindrical body 1d is disposed on the outer peripheral side of the premixing chamber 14. The primary air supply passage 15 outside the catalytic combustion section 6 is used. The primary air supplied to the premixing chamber 14 is guided upstream of the premixing chamber 14. As a result, the primary air turns at the upper end of the cylindrical body 1d and flows into the premixing chamber 14, whereby the mixing property between the primary air and the fuel in the premixing chamber 14 can be enhanced, and the combustion in the catalytic combustion section 6 Unevenness can be suppressed. Note that the same reference numerals as those in FIG. 2A indicate the same configurations as those in FIG.

[Fifth Embodiment] FIG. 10 shows a fifth embodiment. In the fifth embodiment, the cylindrical body 1d (a cylinder formed by extending the small-diameter cylinder 1a of the combustion cylinder 1 extending upstream) shown in the fourth embodiment is disposed in contact with the end plate 23, and the cylindrical body 1d is provided. Body 1
A plurality of nozzles 47 are provided on the end plate 23 side of d.
The injection port 47 has a throttling effect, and is used for the premixing chamber 1.
The primary air is supplied at a high speed into 4. As a result, the premixing chamber 1
4 is improved, and good combustion can be obtained.
Note that the same reference numerals as those in FIG. 2A indicate the same configurations as those in FIG.

[Sixth Embodiment] FIG. 11 shows a sixth embodiment. In the sixth embodiment, the primary air supplied at high speed from the injection port 47 is directed tangentially into the cylindrical body 1d shown in the fifth embodiment, and the primary air supplied to the premixing chamber 14 is changed to the primary air. A deflected flow guide 48 (corresponding to a swirling flow generating means) for generating a swirling flow is attached. Since the swirling flow is generated in the premixing chamber 14 by the primary air supplied to the premixing chamber 14, the mixing property between the primary air and the fuel in the premixing chamber 14 can be improved, and good combustion can be obtained. Can be. Note that the same reference numerals as those in FIG.
The same configuration as (a) is shown.

[Seventh Embodiment] FIG. 12 shows a seventh embodiment. In the seventh embodiment, the diameter of the end plate 23 side of the cylindrical body 1d shown in the sixth embodiment is reduced to a small diameter, and the premix chamber 14
The swirling speed of the premixing chamber 1 is increased, and the injection port 47 faces the vaporized fuel ejected from the evaporation cylinder 30.
4, the mixing property between the primary air and the fuel can be improved, and good combustion can be obtained. In addition, FIG.
2 denote the same components as in FIG. 2A.

[Eighth Embodiment] FIG. 13 shows an eighth embodiment. The eighth embodiment is also adopted in the seventh embodiment, in which the insulating material 28c on the end plate 23 side of the evaporation cylinder 30 is eliminated, and the entire circumference is provided between the evaporation cylinder 30 and the center electrode tube 29. Is provided. This gap becomes the fuel ejection hole 32 for ejecting the vaporized fuel, and the vaporized fuel vaporized by the carburetor 7 is uniformly discharged over the entire circumference, so that the mixing property between the primary air and the fuel in the premixing chamber 14 is improved. And good combustion can be obtained. Note that FIG.
The same reference numerals as in FIG. 2A indicate the same configurations as those in FIG.

[Ninth Embodiment] FIG. 14 shows a ninth embodiment. In the ninth embodiment, heat exchange fins 49 are provided on the inner and outer surfaces of an outer air guide cylinder 9 (corresponding to a partition) that partitions the combustion gas passage 4 and the outer air supply passage 10. The combustion gas passage 4 and the outer air supply passage 1 are provided in the outer gas guide tube 9 of the combustion gas passage 4 and the outer air supply passage 10.
By providing the heat exchange fins 49 on both sides of the zero side,
The preheating effect of the air can be further enhanced. FIG.
1 denote the same components as in FIG.

[Tenth Embodiment] FIG. 15 shows a tenth embodiment. In the tenth embodiment, the combustion cylinder 1
A deflected flow guide 50 (corresponding to a swirling flow generating means) that directs the secondary air supplied from the secondary air inlet 8 in a tangential direction to generate a swirling flow in the secondary air supplied into the combustion tube 1.
Is attached. Since the swirling flow is given to the secondary air supplied to the combustion chamber 16, the mixing property between the primary air and the unburned fuel at the completion of the combustion can be improved, and the combustion efficiency can be improved. Further, a part of the combustion gas flows into the secondary combustion part by the swirling flow of the combustion gas, and the exhaust emission can be reduced by the EGR effect. Further, since the secondary combustion turns, the combustion length required for the secondary combustion can be shortened, and the size of the catalytic combustion device can be reduced. Note that the same reference numerals as in FIG. 1 indicate the same configuration as in FIG.

[Eleventh Embodiment] FIGS. 16 to 18 show a first embodiment.
1 shows an embodiment. Note that the same reference numerals as those described in the above embodiments indicate the same functional objects. In this embodiment, a high-temperature heating section 51 (corresponding to a high-temperature section) that generates heat at a high temperature is provided inside the energizing heating element constituting the catalytic combustion section 6, and a low-temperature heating section 52 (other parts) is provided around the high-temperature heating section 51. Is equivalent to
Are arranged, and the high-temperature heating section 51 and the low-temperature heating section 52 are arranged separately.

As in the first embodiment, the energized heating element constituting the catalytic combustion section 6 is formed by winding a plurality of strip-shaped heating elements 38 each formed by joining a flat plate 38a and a corrugated plate 38b. The high-temperature heating section 51 is formed by winding a small number (for example, two or one) of band-shaped heating elements 38 connected in parallel around the evaporating cylinder 30, and the periphery thereof is surrounded by the intermediate electrode 54. Connected. The belt-shaped heating element 38 of the high-temperature heating section 51 is, for example, F
A thin insulating layer such as alumina is provided on the surface of a pair of metal foils (for example, 50 μm in thickness) of a flat plate 38a and a corrugated plate 38b that generate heat due to a current-carrying resistance made of e-Cr-Al ferritic stainless steel, and further, Pt, Pd, etc. Is carried. Note that the high-temperature heat generating portion 51 may be regarded as mainly used for ignition, and the supporting of the catalyst may be omitted.

The low-temperature heating section 52 includes a number (for example, 5) of strip heating elements 38 connected in parallel around the intermediate electrode 54.
, And the periphery thereof is connected to the outer peripheral electrode 39. In the same manner as described above, the belt-shaped heating element 38 of the low-temperature heating section 52 includes, for example, a flat plate 38a and a corrugated plate 38b that generate heat by a current-carrying resistance made of Fe—Cr—Al ferrite stainless steel.
A thin insulating layer such as alumina is provided on the surfaces of a pair of metal foils (for example, 50 μm thick), and a catalyst such as Pt and Pd is further supported.

The high-temperature heating section 51 and the low-temperature heating section 52 are connected in series, and when a voltage is applied through the evaporating cylinder 30, the high-temperature heating section 51 has two band-shaped heating elements 38.
In the low-temperature heating section 52, the current is divided and flows through the five band-shaped heating elements 38. In other words, the amount of current per one belt-shaped heating element 38 constituting the high-temperature heating section 51 is larger than the amount of current per one belt-shaped heating element 38 constituting the low-temperature heating section 52. The heat is generated to a higher temperature than the heat generating portion 52.

The characteristic operation of this embodiment will be described.
When an operation switch (not shown) is turned on and energization is started, the high-temperature heating unit 51 is provided so as to generate heat at a higher temperature than the low-temperature heating unit 52. As shown in FIG.
The high-temperature heat-generating part 51 indicated by a solid line B
The temperature rises more rapidly.

In the catalytic combustion section 6, at the initial stage of energization, the central high-temperature heat generating section 51 is heated first, and the air-fuel mixture passing through the high-temperature heat generating section 51 precedes the air-fuel mixture passing through the low-temperature heat generating section 52. Partially oxidizes to a high temperature and quickly reaches the ignition combustion temperature. As described above, when the air-fuel mixture that has passed through the high-temperature heating section 51 reaches the ignition combustion temperature,
The gaseous phase combustion starts immediately by the secondary combustion air sent from the secondary air inlet 8 to the combustion chamber 16. Then, the air-fuel mixture that has passed through the low-temperature heating section 52 is triggered to ignite.

In the eleventh embodiment, as shown in the above operation, the high-temperature heating section 51 provided at the center of the catalytic combustion section 6 has a high temperature before the low-temperature heating section 52, The catalytic reaction is quickly started in the part 51,
Ignition is started prior to the low-temperature heating section 52. Thus, the catalytic combustion device can be started for a short time, and the power consumption at the time of starting can be reduced.

[Twelfth Embodiment] FIG. 19 shows a twelfth embodiment. Note that the same reference numerals as those described in the above embodiments indicate the same functional objects. In the eleventh embodiment, an example is shown in which at least a part of the catalytic combustion unit 6 is provided with the high-temperature heating unit 51 to partially promote the catalytic reaction. A reaction accelerating portion 61 (a lower hatched portion in FIG. 19) is partially provided on the upstream side of the belt-shaped heat generating member 38, and an ignition portion 62 (an upper hatching in FIG. 19) is provided on the downstream side of the reaction accelerating portion 61. part)
Is provided. The reaction accelerating portion 61 quickly reaches a reaction start temperature (for example, 300 ° C.) of the supported catalyst by energization, and the ignition portion 62 becomes a temperature (for example, 700 to 800 ° C.) or more suitable for ignition by energization. It can be reached quickly.

The reaction promoting section 61 and the ignition section 62
As shown in FIG. 9, a flat plate 38a constituting the belt-shaped heating element 38
Is formed by providing a through-hole 63 by punching inside the inside. By providing the through holes 63 inside the flat plate 38a in this manner, the current flowing through the flat plate 38a flows through the upstream reaction promoting section 61 and the downstream ignition section 62, and constitutes the reaction promoting section 61. Axial length L1 and width W1,
The heat generation temperature of the reaction promoting unit 61 and the heat generation temperature of the ignition unit 62 are set by the axial length L2 and the width W2 of the ignition unit 62.

Specifically, in this embodiment, the through hole 63 is T
The reaction promoting portion 61 is formed on the upstream side of the width direction cutout portion 63a orthogonal to the axial direction on the upstream side,
The ignition portion 62 is formed on the downstream side of the axial cutout portion 63b along the axial direction. In this embodiment, the width W1 of the reaction promoting portion 61 is increased, the width W2 of the ignition portion 62 is reduced, and the axial length L of the reaction promoting portion 61 is reduced.
1 is made longer and the axial length L2 of the ignition portion 62 is made shorter, so that the energization resistances of the reaction promoting portion 61 and the ignition portion 62 are made substantially equal. With such a configuration, the reaction promoting unit 6
Numeral 1 rapidly reaches 300 ° C. or higher by energization, and the ignition portion 62 rapidly reaches 700 ° C. or higher by energization.

The through holes 63 are set in an appropriate number and at appropriate intervals in the winding direction of the flat plate 38a. In addition,
The corrugated plate 38b may be provided with the through-hole 63 similarly to the flat plate 38a. It is desirable that a plurality of the reaction accelerating portions 61 be arranged substantially evenly when the catalytic heating portion 6 is formed by winding the belt-shaped heating element 38 when viewed from the upstream side of the catalytic combustion portion 6. Thereby, the ignition portions 62 on the downstream side of the catalytic combustion portion 6 are also arranged substantially uniformly.

The characteristic operation of this embodiment will be described. When an operation switch (not shown) is turned on and a voltage is applied to the catalytic combustion unit 6, the reaction promoting unit 61 and the ignition unit 62 generate heat prior to other locations. The air-fuel mixture passing through the reaction promoting section 61 is partially oxidized by the catalyst. Then, the air-fuel mixture partially oxidized by the reaction accelerating unit 61 reaches the ignition temperature when passing through the ignition unit 62. As described above, when the air-fuel mixture that has passed through the ignition section 62 reaches the ignition combustion temperature,
The gaseous phase combustion starts immediately by the secondary combustion air sent from the secondary air inlet 8 to the combustion chamber 16. Then, the air-fuel mixture that has passed other than the ignition portion 62 is ignited.

In the twelfth embodiment, as shown in the above operation, the reaction promoting section 61 which reaches the catalytic reaction temperature by energization is provided upstream of the catalytic combustion section 6, so The temperature of the reaction accelerating portion 61 quickly rises before the other portions, and the reaction accelerating portion 61 starts a catalytic reaction quickly. The gaseous mixture that has undergone a catalytic reaction in the reaction promoting section 61 and has been oxidized is led to the ignition section 62. In the ignition part 62, the ignition temperature is quickly reached by energization, and an air-fuel mixture oxidized by the reaction promoting part 61 is guided to the ignition part 62. For this reason, ignition easily occurs. And the ignition part 62 plays a role of flame holding, and also warms the catalyst of the other part and promotes the catalytic reaction of the other part. As described above, since local ignition can be performed in a short time immediately after the start of operation, the catalytic combustion device can be started in a short time, and power consumption at the time of starting can be reduced. Further, since the ignition portion 62 and the reaction promoting portion 61 are formed by providing the through holes 63 in the flat plate 38a,
It is easy to manufacture the ignition section 62 and the reaction promoting section 61,
A catalytic combustion device including the ignition section 62 and the reaction promoting section 61 can be provided at low cost.

[Thirteenth Embodiment] FIG. 20 shows a thirteenth embodiment. Note that the same reference numerals as those described in the above embodiments indicate the same functional objects. In the above-described twelfth embodiment, the example in which the T-shaped through hole 63 is provided in the flat plate 38a to form the reaction accelerating portion 61 on the upstream side and the ignition portion 62 on the downstream side has been described. As shown in FIG. 20, a triangular through hole 63 is provided in a flat plate 38a to form a reaction promoting portion 61 on the upstream side and an ignition portion 62 on the downstream side.

Also in this embodiment, the reaction promoting section 61
The width W1 of the ignition portion 62 is increased, the width W2 of the ignition portion 62 is decreased, the axial length L1 of the reaction promotion portion 61 is increased, and the axial length L2 of the ignition portion 62 is reduced. The energization resistance of the ignition part 62 is almost equalized,
The current passing density of the ignition section 62 is higher than that of the reaction promotion section 61, and the reaction promotion section 61 is provided so as to reach 300 ° C. by energization, and the ignition section 62 is provided so as to reach 700 ° C. by energization. ing.

[Fourteenth Embodiment] FIGS. 21 and 22 show a first embodiment.
4 shows a fourth embodiment. Note that the same reference numerals as those described in the above embodiments indicate the same functional objects. The above twelfth and thirteenth
In the embodiment, the example in which the reaction accelerating unit 61 is provided on the upstream side of the catalytic combustion unit 6 is shown. However, as shown in FIG. It is provided along the longitudinal direction of the hole (the passage formed between the flat plate 38a and the corrugated plate 38b).

The reaction accelerating part 61 in this embodiment is
Flat plate 38a or corrugated plate 38 constituting the belt-shaped heating element 38
The electrical resistance value is locally increased by reducing at least one width of b. Specifically, in this embodiment, as shown in FIG. 22, a deep upstream notch 61a is formed in a part on the upstream side of the belt-shaped heating element 38, and a part on the downstream side next to the upstream notch 61a. A deep downstream notch 61b is also formed, and an upstream notch 61a and a downstream notch 61 are formed.
b, a reaction promoting portion 61 is formed along the longitudinal direction of the through-hole at a portion sandwiched by b.

The characteristic operation of this embodiment will be described. When an operation switch (not shown) is turned on and a voltage is applied to the catalytic combustion unit 6, the reaction promoting unit 61 generates heat quickly ahead of other parts. The air-fuel mixture passing through the through-hole provided with the reaction accelerating portion 61 is activated by a catalyst carried in the through-hole, or by self-activation accompanying heating on a heat generating surface in the through-hole regardless of catalytic reaction. Activate. The gaseous mixture that has been activated by passing through the reaction accelerating unit 61 is immediately started to undergo gas phase combustion by the secondary combustion air sent from the secondary air inlet 8 to the combustion chamber 16. Then, the combustion induces and ignites the air-fuel mixture that has passed other than the reaction promoting section 61.

In the fourteenth embodiment, the reaction promoting section 61
Is provided along the longitudinal direction of the through-hole, so that the time for the air-fuel mixture to pass through the reaction promoting portion 61 is increased. That is, the time during which the air-fuel mixture stays in the reaction promoting section 61 is relatively long. As a result, the temperature rise and activation of the air-fuel mixture are promoted, and the ignitability of the air-fuel mixture that has passed through the reaction promoting section 61 is improved.

[Fifteenth Embodiment] FIG. 23 shows a fifteenth embodiment. Note that the same reference numerals as those described in the above embodiments indicate the same functional objects. Although the reaction accelerating unit 61 of the above-described fourteenth embodiment shows an example in which the electric resistance value is locally increased by narrowing the width of the belt-shaped heating element 38, the reaction accelerating unit 61 of this embodiment has Flat plate 38 constituting body 38
The electrical resistance value is locally increased by thinning at least a part of a or a corrugated plate 38b.
More specifically, the flat plate 38a of this embodiment is formed by forming a thin metal strip by two.
The reaction promoting portion 61 (FIG. 23)
Is a thinned portion arbitrarily made into only one layer. Thus, the reaction promoting section 61 is
Is made by local thinning of
The shapes of the 8a and the corrugated plate 38b are not complicated and can be manufactured relatively easily.

[Sixteenth Embodiment] FIGS. 24 and 25 show the first embodiment.
6 shows a sixth embodiment. Note that the same reference numerals as those described in the above embodiments indicate the same functional objects. The reaction accelerating portion 61 of the sixteenth embodiment is provided with a downstream heat generating portion 61c which has a higher temperature than the other portions on the downstream side of the belt-shaped heat generating member 38 by cutting a part of the upstream side of the band-shaped heat generating member 38. By cutting a part of the downstream side of the other belt-shaped heating element 38, an upstream-side heating part 61d which is higher in temperature than the other part is provided on the upstream side of the belt-shaped heating element 38. A high-temperature heating section is formed along the longitudinal direction of the through hole by overlapping the downstream heating section 61c and the upstream heating section 61d. As described above, since the downstream-side heat generating portion 61c and the upstream-side heat generating portion 61d formed by the notches are provided in different belt-like heat generating members 38, the band-like heat generating members 38 are different from the fourteenth embodiment.
Can be simplified, and production becomes easy. Further, the simplification of the cutting shape makes it possible to reduce the manufacturing cost.

[Seventeenth Embodiment] FIGS. 26 and 27 show the first embodiment.
7 shows a seventh embodiment. Note that the same reference numerals as those described in the above embodiments indicate the same functional objects. The above twelfth and thirteenth
In the embodiment, the example in which the ignition section 62 is provided on the downstream side of the catalytic combustion section 6 has been described, but the ignition section 62 of the seventeenth embodiment is described.
As shown in FIG. 26, is provided to protrude into the combustion chamber 16 on the downstream side of the catalytic combustion section 6. The ignition section 62
The electric resistance value is locally increased by reducing a part of the width of the belt-shaped heating element 38 or thinning at least a part of at least one of the flat plate 38a and the corrugated plate 38b constituting the belt-shaped heating element 38. It is. As shown in FIG. 27, the ignition portion 62 in this embodiment narrows a part of the width of the belt-shaped heating element 38, and the narrowed ignition portion 62 becomes the catalytic combustion portion 6.
Is provided to protrude to the downstream side.

The characteristic operation of this embodiment will be described. When an operation switch (not shown) is turned on and a voltage is applied to the catalytic combustion portion 6, the ignition portion 62 protruding into the combustion chamber 16 generates heat quickly ahead of other portions. Here, the ignition part 6
In some cases, the mixture state of the air-fuel mixture supplied to the through-hole in which 2 is formed is poor, and the air-fuel mixture having an air-fuel ratio suitable for ignition is not supplied to the through-hole of the ignition part 62. Even in such a case, since the ignition portion 62 is provided so as to protrude into the combustion chamber 16, the ignition portion 62 comes into contact with a large amount of air-fuel mixture that has passed through many through-holes. Is no longer affected by the mixing state before flowing through. That is, the air-fuel mixture that touches the ignition portion 62 is a large amount of air-fuel mixture that has passed through many through-holes, and the air-fuel mixture has a good stirring state, so that ignition is performed in the ignition portion 62 stably. Then, the ignition part 6
The surrounding air-fuel mixture is ignited by the combustion generated in step 2.

In the seventeenth embodiment, as shown in the above operation, since the ignition portion 62 is provided to protrude into the combustion chamber 16, the ignition portion 62 has a large amount of mixing passing through many through holes. Therefore, the air-fuel mixture touching the ignition portion 62 is not affected by the mixing state before flowing through. In other words, even if the state of mixing of the air-fuel mixture supplied to the through-hole with the ignition portion 62 is poor, a large amount of air-fuel mixture having a good mixing ratio is supplied to the ignition portion 62, so that stable and quick ignition can be obtained. .

[Eighteenth Embodiment] FIGS. 28 and 29 show the first embodiment.
Eighth embodiment is shown. Note that the same reference numerals as those described in the above embodiments indicate the same functional objects. In the eighteenth embodiment, the high-temperature heating portion 51 (for example, an area in which the electrical resistance value is increased by means such as reducing the number of windings of the belt-shaped heating element 38) shown in the eleventh embodiment is replaced with a surrounding area. It is slidably installed downstream of the low-temperature heating section 52 (for example, an area where the electric resistance value is reduced by increasing the number of windings of the belt-shaped heating element 38), and the downstream end of the high-temperature heating section 51 is burned. It is provided to protrude into the chamber 16. With this arrangement, the downstream protruding portion of the high-temperature heat-generating portion 51 functions as the ignition portion 62, and the same effect as in the seventeenth embodiment can be obtained. In addition, by providing in this way,
As shown in the seventeenth embodiment, since the shape of projecting a part of the belt-like heating element 38 to the downstream side is not complicated, the production becomes easy and the production becomes possible at low cost.

[Nineteenth Embodiment] FIGS. 30 and 31 show the first embodiment.
9 embodiment is shown. Note that the same reference numerals as those described in the above embodiments indicate the same functional objects. In the nineteenth embodiment, a part of the high-temperature heating part 51 constituting the eighteenth embodiment, which is a part of the upstream side of the belt-shaped heating element 38, is cut off, and the electric resistance value is locally increased downstream thereof. 62 are provided. By providing in this manner, the ignition portion 62 is formed in the downstream protruding portion, and the same effect as in the seventeenth embodiment can be obtained. Further, by providing such a structure, the downstream side of the belt-shaped heating element 38 can be formed without complicating the shape of projecting a part of the belt-shaped heating element 38 to the downstream side as shown in the seventeenth embodiment. Because they can be aligned,
It is easy to manufacture and can be manufactured at low cost. In addition, power can be saved due to local heat generation.

[Other Embodiments] In the above embodiment, an example is shown in which the catalytic combustion device is used for a hot water heating device of an automobile. However, the present invention may be applied to other combustion devices such as a fan heater.
In the twelfth and thirteenth embodiments, the catalytic combustion unit 6 including both the reaction promoting unit 61 and the ignition unit 62 has been described as an example, but the catalytic combustion unit including only one of the ignition unit 62 and the reaction promoting unit 61. 6 may be used.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a hot water heating device using a catalytic combustion device (first embodiment).

FIG. 2 is an enlarged sectional view of a main part of the catalytic combustion device (first embodiment).

FIG. 3 is a perspective view for explaining the assembly of a fuel evaporator and a catalytic combustor (first embodiment).

FIG. 4 is a schematic diagram of a control device (first embodiment).

FIG. 5 is a time chart for explaining the operation (first embodiment).

FIG. 6 is a schematic sectional view of a hot water heating device using a catalytic combustion device (second embodiment).

FIG. 7 is an enlarged sectional view of a main part of a catalytic combustion device (second embodiment).

FIG. 8 is an enlarged sectional view of a main part of a catalytic combustion device (third embodiment).

FIG. 9 is an enlarged sectional view of a main part of a catalytic combustion device (fourth embodiment).

FIG. 10 is an enlarged sectional view of a main part of a catalytic combustion device (fifth embodiment);
Embodiment).

FIG. 11 is an enlarged sectional view of a main part of a catalytic combustion device (sixth embodiment);
Embodiment).

FIG. 12 is an enlarged sectional view of a main part of the catalytic combustion device (seventh embodiment).
Embodiment).

FIG. 13 is an enlarged sectional view of a main part of a catalytic combustion device (eighth embodiment);
Embodiment).

FIG. 14 is a schematic sectional view of a hot water heating device using a catalytic combustion device (ninth embodiment).

FIG. 15 is a schematic sectional view of a hot water heating device using a catalytic combustion device (tenth embodiment).

FIG. 16 is a schematic sectional view of a hot water heating device using a catalytic combustion device (11th embodiment).

FIG. 17 is an enlarged sectional view of a main part of a catalytic combustion device (first example).
One embodiment).

FIG. 18 is a graph showing the temperature rise characteristics of a high-temperature heating section and a low-temperature heating section (11th embodiment).

FIG. 19 is a perspective view showing a belt-shaped heating element before winding (twelfth embodiment).

FIG. 20 is a perspective view showing a belt-shaped heating element before winding (a thirteenth embodiment).

FIG. 21 is an enlarged sectional view of a main part of the catalytic combustion device (first example).
Fourth embodiment).

FIG. 22 is a perspective view showing a belt-shaped heating element before winding (a fourteenth embodiment).

FIG. 23 is a perspective view showing a belt-shaped heating element before winding (fifteenth embodiment).

FIG. 24 is an enlarged sectional view of a main part of the catalytic combustion device (first example).
Six embodiments).

FIG. 25 is a perspective view showing a belt-shaped heating element before winding (16th embodiment).

FIG. 26 is an enlarged sectional view of a main part of the catalytic combustion device (first example).
Seventh embodiment).

FIG. 27 is a perspective view showing a belt-shaped heating element before winding (a seventeenth embodiment).

FIG. 28 is an enlarged sectional view of a main part of the catalytic combustion device (first example).
Eighth embodiment).

FIG. 29 is a perspective view showing a belt-shaped heating element before winding (18th embodiment).

FIG. 30 is an enlarged sectional view of a main part of the catalytic combustion device (first example).
9 embodiment).

FIG. 31 is a perspective view showing a belt-shaped heating element before winding (19th embodiment).

[Description of Signs] 4 Combustion gas passage 6 Catalytic combustion unit 7 Vaporizer 8 Secondary air inlet 9 Outer air guide tube (partition) 10 Outer air supply passage (air supply passage) 14 Premix chamber 15 Primary air supply passage DESCRIPTION OF SYMBOLS 16 Combustion chamber 29 Center electrode tube 30 Evaporating cylinder 30a Closed end face of evaporating cylinder 31 Fuel evaporating part 32 Fuel ejection hole 38 Strip heating element 45 Fuel absorber 48 Deflected flow guide (swirl flow generating means for generating swirl flow in primary air 49) Heat exchange fins 50 Deflected flow guide (Swirl flow generating means for generating a swirling flow in the secondary air) 51 High temperature heating part (High temperature part) 52 Low temperature heating part (Other part) 61 Reaction promoting part 61c Downstream side Heat generation part 61d Upstream heat generation part 62 Ignition part 63 Through hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Seiji Kawaguchi 1-1-1, Showa-cho, Kariya-shi, Aichi Pref. (72) Inventor Akira Ito 1-1-1 Showa-cho, Kariya-shi, Aichi F-term in DENSO Corporation (Reference) 3K052 AA01 AA02 AA10 AB03 AB10 AC03 AC05 BA12 BA22 BA23 BA31 CA04 CA12 CA13 CA21 FA01 FA08 3K065 TA13 TA14 TB08 TC02 TD04 TE04 TE07 TG02 TH01 TH02 TJ06 TJ07 TK02 TK04 TK05 TM03 TN01

Claims (25)

[Claims] 1. A catalytic combustion device having a vaporization function, comprising: a vaporizer having a fuel evaporator for vaporizing liquid fuel; and a catalytic combustion unit for catalytically burning the vaporized fuel vaporized by the vaporizer. The evaporating section and the catalytic combustion section have a large number of through-holes, and are configured in a block of an energized heating element capable of generating heat when energized. A catalytic combustion device with a vaporization function, which is defined by an evaporating cylinder that covers an evaporator. 2. The catalytic combustion device with a vaporization function according to claim 1, wherein the catalytic combustion portion is provided by carrying a catalyst on a surface of the energizing heating element constituting the catalytic combustion portion. Catalytic combustion device with vaporization function. 3. The catalytic combustion device with a vaporization function according to claim 1, wherein the vaporizer includes an evaporating cylinder receiving a supply of liquid fuel, and a fuel evaporator disposed in the evaporating cylinder and generating heat by energization. And a catalytic combustion device with a vaporization function. 4. The catalytic combustion device with a vaporization function according to claim 3, wherein the vaporizer has a central electrode tube for supplying electric power and liquid fuel, in addition to the evaporator cylinder and the fuel evaporator. One end of the cylinder is a closed end face facing the combustion chamber on the downstream side of the catalytic combustion section, and the other end of the evaporating cylinder guides fuel vaporized inside to the premixing chamber upstream of the catalytic combustion section. An opening end of a tip of the center electrode tube in the evaporating cylinder has a fuel ejection hole, and is opposed to a closed end surface of the evaporating tube and is spaced apart therefrom, and is supplied from the center electrode tube. The catalytic combustion device with a vaporization function, wherein the liquid fuel passes from the separated portion, passes through the fuel evaporator, and reaches the premixing chamber. 5. The catalytic combustion device with a vaporization function according to claim 4, wherein a porous fuel absorber is disposed between a closed end surface of the evaporating cylinder and an open end of the center electrode tube. Characteristic catalytic combustion device with vaporization function. 6. The catalytic combustion device with a vaporization function according to claim 3, wherein the catalytic combustion portion is disposed outside the evaporating cylinder in which the fuel vaporization portion is disposed, and A catalytic combustion apparatus with a vaporization function, wherein the evaporating section and the catalytic combustion section adopt a two-layer structure. 7. The catalytic combustion device with a vaporization function according to claim 6, wherein the fuel evaporating section and the catalytic combustion section adopt a concentric two-layer structure, and the outer periphery thereof has a space upstream of the catalytic combustion section. A catalytic combustion device with a vaporization function, wherein a primary air supply passage for supplying primary air to a mixing chamber is arranged. 8. The catalytic combustion device with a vaporizing function according to claim 7, wherein the primary air supplied to the premixing chamber by the primary air supply passage outside the catalytic combustion section is upstream of the premixing chamber. A catalytic combustion device with a vaporization function, wherein a cylindrical body for directing the flow of the primary air is arranged on the outer peripheral side of the premixing chamber so as to guide the primary air flow. 9. The catalytic combustion device with a vaporization function according to claim 8, wherein the cylindrical body is provided with a swirling flow generating means for generating a swirling flow in the primary air supplied to the premixing chamber inside the cylindrical body. A catalytic combustion device with a vaporization function. 10. The catalytic combustion device with a vaporization function according to claim 7, wherein a secondary air supply for supplying secondary air downstream of the primary air supply means and the catalytic combustion unit. The means is constituted by the same air supply passage, and a combustion gas passage through which the combustion gas flows is arranged on the outer periphery of the air supply passage. By the combustion gas passage and the partition of the air supply passage,
A catalytic combustion device with a vaporization function, which performs heat exchange between combustion gas and air. 11. The catalytic combustion device with a vaporization function according to claim 1, wherein the energized heating element is guided upstream of the catalytic combustion section.
A catalytic combustion device with a vaporization function, wherein the catalytic combustion device is provided so as to be able to heat secondary air. 12. The catalytic combustion device with a vaporizing function according to claim 1, wherein the secondary air supply means for supplying secondary air downstream of the catalytic combustion section is configured to supply secondary air downstream of the catalytic combustion section. A catalytic combustion device with a vaporization function, comprising a secondary air inlet for blowing air, and the secondary air inlet includes a swirl flow generating means for generating a swirl flow in the secondary air. 13. The catalytic combustion device with a vaporization function according to claim 10, wherein heat exchange fins are provided between the combustion gas passage and the air supply passage. apparatus. 14. The catalytic combustion device with a vaporization function according to claim 1, wherein at least one part of said energizing heating element constituting said catalytic combustion part is provided at a higher temperature than other parts. Catalytic combustion device with function. 15. The catalytic combustion apparatus with a vaporization function according to claim 14, wherein a high-temperature portion of the energized heating element is provided separately from other portions. apparatus. 16. The catalytic combustion device with a vaporization function according to claim 14, wherein the energizing heating element constituting the catalytic combustion section is formed by winding a plurality of strip-shaped heating elements formed by joining a flat plate and a corrugated plate. And the high-temperature portion and the other portion are connected in series, and the band-shaped heating element constituting the high-temperature portion has a greater number of strips than the strip-shaped heating element of the other portion. The strip-shaped heating element 1 constituting the high-temperature portion by being provided in a small number
A catalytic combustion device with a vaporization function, wherein the amount of current per contact increases and generates heat at a higher temperature than the belt-shaped heating element in the other portion. 17. The catalytic combustion device with a vaporization function according to claim 1, wherein at least a part of an ignition part which is higher in temperature than other parts is provided on a downstream side of said energizing heating element constituting said catalytic combustion part. A catalytic combustion device with a vaporization function. 18. The catalytic combustion device with a vaporization function according to claim 1, wherein at least one part of the upstream side of the energizing heating element constituting the catalytic combustion part has a higher temperature than other parts, and an oxidation reaction of the fuel is performed. A catalytic combustion device with a vaporization function, comprising a reaction accelerating unit for accelerating the reaction. 19. The catalytic combustion device with a vaporization function according to claim 1, wherein at least a portion of the ignition portion that is higher in temperature than other portions is provided downstream of the energizing heating element constituting the catalytic combustion portion. An upstream side of the energizing heating element constituting the catalytic combustion section is provided with a reaction promoting section that is at least partly higher in temperature than other parts and promotes a fuel oxidation reaction, A catalytic combustion device with a vaporization function, which is provided on a path through which an air-fuel mixture that has passed through a reaction promoting section passes. 20. The catalytic combustion device with a vaporization function according to claim 19, wherein the energizing heating element is provided by winding a strip heating element, and wherein the ignition section and the reaction promoting section are formed by the strip heating element. A catalytic combustion device with a vaporization function, characterized in that the device is formed by providing a through hole in the device. 21. The catalytic combustion device with a vaporization function according to claim 1, wherein at least a part of the energized heating element constituting the catalytic combustion part generates heat at a higher temperature than other parts, thereby promoting a fuel oxidation reaction. A catalytic combustion device with a vaporization function, wherein a reaction promoting portion is provided along the longitudinal direction of the through-hole. 22. The catalytic combustion device with a vaporization function according to claim 21, wherein the energizing heating element constituting the catalytic combustion section is formed by winding a strip-shaped heating element in which a flat plate and a corrugated plate are joined. The reaction promoting unit is provided on a part of the belt-shaped heating element, and the reaction promoting unit thins at least one of the flat plate or the corrugated plate constituting the belt-shaped heating element, and has an electric resistance value. A catalytic combustion device with a vaporization function, characterized in that the combustion temperature is raised. 23. The catalytic combustion device with a vaporization function according to claim 21, wherein the energizing heating element constituting the catalytic combustion section is formed by winding a strip-shaped heating element in which a flat plate and a corrugated plate are joined. The reaction accelerating unit is provided on a part of the belt-shaped heating element. By cutting at least a part of an upstream side of the flat plate or the corrugated sheet, the reaction promoting part is provided on a downstream side of the belt-shaped heating element. A downstream heat-generating portion that is higher in temperature than other portions is provided. By cutting at least a part of the downstream side of the flat plate or the corrugated plate, the upstream side of the belt-shaped heat generating body has a higher temperature than other portions. An upstream heat generating portion is provided, and the reaction promoting portion is provided along a longitudinal direction of the through-hole by overlapping of the upstream heat generating portion and the downstream heat generating portion due to the winding of the belt-shaped heat generating member. Characterized by A catalytic combustion device with a vaporization function. 24. The catalytic combustion device with a vaporization function according to claim 1, wherein at least a part of an ignition part which is higher in temperature than other parts is provided on a downstream side of said energizing heating element constituting said catalytic combustion part. The igniting portion is provided so as to protrude into a combustion chamber on the downstream side of the catalytic combustion portion, and is provided with a vaporizing function. 25. The catalytic combustion device with a vaporization function according to claim 24, wherein the energizing heating element constituting the catalytic combustion section is formed by winding a plurality of strip-shaped heating elements formed by joining a flat plate and a corrugated plate. The belt-shaped heating element constituting the ignition part and the belt-shaped heating element constituting the other part are partitioned and connected in series, and the belt-shaped heating element constituting the ignition part is the other heating element. By providing less than the number of the strip-shaped heating elements in a portion, the amount of current per one of the strip-shaped heating elements constituting the ignition portion is increased, and heat is generated at a higher temperature than the strip-shaped heating elements in the other portion. The catalytic combustion device with a vaporization function, wherein the belt-shaped heating element constituting the ignition portion is provided so as to protrude into a combustion chamber downstream of the other band-shaped heating element.