JP3392541B2 - Control method of catalytic combustion device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a forced circulation system for heating a mixture of fuel and air vaporized in a vaporization chamber by bringing it into contact with a heated self-heating type conductive catalyst for combustion. The present invention relates to a method for controlling a catalytic combustion device such as an oil heating device.

[0002]

2. Description of the Related Art This type of catalytic combustion apparatus uses, for example, kerosene as a fuel, and mixes the kerosene vaporized by a vaporizer with air to produce an air-fuel mixture. Heating or the like is performed by bringing the catalyst into contact with the catalyst to cause a combustion reaction.

In such a catalytic combustion apparatus, a reaction in which a mixture of fuel and air is changed into heat of reaction with carbon dioxide and water occurs on the surface of the catalyst. Therefore, when the catalytic combustion apparatus is used as a heater, this reaction occurs. Although the reaction heat is used for heating, the indoor exhaust type, which is the mainstream of small oil heaters, also discharges the combustion exhaust gas generated by this reaction directly into the room.

[0004]

Therefore, if the combustion state becomes unstable due to a decrease in catalyst activity, unburned fuel and intermediate products may be discharged indoors. In particular, if combustion is started when the catalyst temperature has not risen sufficiently at the time of ignition, the activation of the catalyst is insufficient and it is unstable. There is a problem that odor may be discharged indoors.

Further, when the catalyst temperature is sufficiently raised by using the self-heating type conductive catalyst and combustion is started by using an air-fuel mixture having an appropriate combustion amount, the above-mentioned unburned components and the like are generated very low. Although it can be suppressed, the fuel from the previous use remains in the carburetor during daily operation, and this residual fuel is vaporized when the heater of the carburetor is energized for preheating at the start of operation, and it is still active. There is a problem in that the unburned gas may be discharged into the room as it is without reacting on the catalyst that has not been converted, and the unburned gas may be discharged in the form of white smoke containing water vapor.

The present invention has been made in view of the above,
It is an object of the present invention to provide a control method of a catalytic combustion device which maintains a combustion exhaust gas in a clean state at the time of combustion including ignition and extinction and has a wide heating variable width from a low combustion amount to a high combustion amount. It is in.

[0007]

In order to achieve the above object, a method for controlling a catalytic combustion apparatus according to the present invention uses a self-heating type conductive catalyst in which a mixture of fuel and air vaporized in a vaporization chamber is heated. A method of controlling a catalytic combustion device in which they are brought into contact with each other to burn, prior to energizing the vaporizer at the start of operation, energize the self-heating conductive catalyst so that the temperature of the self-heating conductive catalyst reaches a predetermined temperature. After confirming that it has reached, the gist of the present invention is to energize the heater of the carburetor and then to operate the fuel pump that supplies fuel to the carburetor.

Further, the control method of the catalytic combustion apparatus of the present invention is a method of controlling the catalytic combustion apparatus, in which a mixture of fuel and air vaporized in the vaporization chamber is brought into contact with a heated self-heating type conductive catalyst and burned. The gist of the present invention is to energize the vaporizer and the self-heating type conductive catalyst for a predetermined time after stopping the fuel supply by the fuel pump when the operation is stopped.

Further, in the control method of the catalytic combustion apparatus of the present invention, when the vaporizer and the self-heating type conductive catalyst are energized for a predetermined time after the fuel supply by the fuel pump is stopped when the operation is stopped, The gist is to supply the air for use by squeezing it to a predetermined amount or less.

The control method of the catalytic combustion apparatus of the present invention is a control method of the catalytic combustion apparatus in which a mixture of fuel and air vaporized in the vaporization chamber is brought into contact with a heated self-heating type conductive catalyst and burned. After stopping the supply of fuel by the fuel pump at the time of operation stop, energize the self-heating type conductive catalyst for a predetermined time, and after confirming that the temperature of the self-heating type conductive catalyst has dropped to a predetermined temperature. The gist is to stop the power supply to the self-heating type conductive catalyst.

[0011]

In the control method of the catalytic combustion apparatus of the present invention, the self-heating type conductive catalyst is energized before the carburetor is energized at the start of operation, and the temperature of the self-heating type conductive catalyst reaches a predetermined temperature. After confirming that, the heater of the carburetor is energized, and then the fuel pump for supplying the fuel to the carburetor is operated.

Further, in the control method of the catalytic combustion apparatus of the present invention, after the fuel supply by the fuel pump is stopped when the operation is stopped, the vaporizer and the self-heating type conductive catalyst are energized for a predetermined time.

Further, according to the control method of the catalytic combustion apparatus of the present invention, when the carburetor and the self-heating type conductive catalyst are energized for a predetermined time after stopping the fuel supply by the fuel pump at the time of the operation stop, Air is supplied after being squeezed to a predetermined amount or less.

In the control method of the catalytic combustion apparatus of the present invention, after the supply of fuel by the fuel pump is stopped when the operation is stopped, the self-heating type conductive catalyst is energized for a predetermined time, and the temperature of the self-heating type conductive catalyst is changed. After confirming that the temperature has dropped to a predetermined temperature, the power supply to the self-heating type conductive catalyst is stopped.

[0015]

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

FIG. 1 is a diagram showing the structure of a catalytic combustion apparatus for carrying out the control method according to the first embodiment of the present invention.
The catalytic combustion apparatus shown in the figure uses, for example, kerosene as a fuel, and mixes the kerosene vaporized by a vaporizer with air to generate an air-fuel mixture, which is then converted into a self-heating conductive catalyst. For example, a forced circulation type oil heating device that performs heating or the like by bringing them into contact with each other to cause a combustion reaction is configured, and has a fuel tank 1 that stores a liquid fuel made of kerosene. Then, the fuel stored in the fuel tank 1 is sent out to the carburetor 5 by the fuel pump 3, and is vaporized there to become combustion gas. The vaporizer 5 has a built-in heater (not shown) and is heated by the heater.

Further, air for combustion is supplied to the carburetor 5 by a fan 7. The combustion gas vaporized by the vaporizer 5 and the air supplied by the fan 7 are mixed in the mixing chamber 9 to form a uniform air-fuel mixture, and the honeycomb-shaped self-heating type conductive catalyst 1 is provided above.
Sent to 1. The self-heating type conductive catalyst 11 is configured to generate heat when energized, and the mixed gas supplied from the mixing chamber 9 comes into contact with the conductive catalyst 11 which is heated by the energization, so that the mixture burns. It is designed to start the reaction. An electrode 13 for energizing the conductive catalyst 11 to generate heat and a catalyst temperature detecting means 15 for detecting the temperature of the conductive catalyst 11 are provided above the conductive catalyst 11. And these electrodes 1
3 and the catalyst temperature detecting means 15 are connected to the controller 17.

Further above the conductive catalyst 11, a honeycomb-shaped self-heating type conductive catalyst 19 having the same structure as the conductive catalyst 11 is provided. The self-heating type conductive catalyst 11 and the mixing chamber 9 are surrounded by a combustion cylinder 21.
Further, the self-heating type conductive catalyst 19 is covered with an exhaust pipe 23 around the periphery thereof, and the exhaust pipe 23 exhausts combustion exhaust gas upward.

FIG. 1 is a side view of the catalytic combustion apparatus. The left side is the front side and the right side is the rear side. A blowout port 25 for blowing warm air into the room is provided near the lower part of the front side. And a fan 2 for blowing warm air into the room behind
7 is attached, and the combustion heat of the air-fuel mixture is sent out from the outlet 25 into the room by rotating the fan 27.

Further, an operation panel 29 is obliquely provided on the uppermost front part of the catalytic combustion device. The operation panel 29 is provided with an operation switch for starting the catalytic combustion apparatus, a temperature adjustment switch for adjusting the temperature, an air volume adjustment switch for adjusting the air volume, and the like.

Next, the operation of the catalytic combustion apparatus having the above-mentioned structure at the time of ignition will be described with reference to the flow chart shown in FIG.

First, when the operation switch of the operation panel 29 is turned on (step 110), the self-heating type conductive catalyst 1
1 is energized, and heating of the self-heating type conductive catalyst 11 is started (step 120). It is checked whether or not the temperature of the conductive catalyst 11 has reached the set temperature (step 13
0), when the temperature of the conductive catalyst 11 reaches a set temperature which is a sufficiently active temperature, the energization of the heater of the vaporizer 5 is started (step 140). It is checked whether the temperature of the vaporizer 5 has reached the set temperature (step 150), and the vaporizer 5
If the temperature reaches the set temperature, the conductive catalyst 1
It is checked whether the temperature of 1 holds a sufficiently active temperature (step 160). When the temperature of the conductive catalyst 11 is maintained at a sufficiently active temperature, the fuel pump 3
And the combustion air supply fan 7 is operated (step 170). As a result, the fuel is fed from the fuel tank 1 to the carburetor 5 by the action of the fuel pump 3. in this case,
Since the vaporizer 5 is preheated by the above-mentioned energization, the fuel sent into the vaporizer 5 is vaporized by the vaporizer 5 and is mixed with the air supplied from the combustion air supply fan 7 in the mixing chamber 9
And mixed to generate a uniform air-fuel mixture.
This air-fuel mixture rises and comes into contact with the conductive catalyst 11 provided in the upper part of the mixing chamber 9. Since the conductive catalyst 11 has reached the activation temperature, the conductive catalyst 1 at this activation temperature
When the air-fuel mixture comes into contact with 1, the air-fuel mixture starts a combustion reaction.

In this case, the fuel supplied to the carburetor 5 is throttled by the fuel pump 3 to an amount that can be sufficiently treated by the electroconductive catalyst 11 only, and a combustion amount of half or less of the maximum treatment amount. In this case, the combustion air is adjusted to be smaller than that during normal combustion so that the air ratio (air supply amount / theoretical air amount required for combustion of supplied fuel), which is the ratio of fuel to combustion air, is 3 or less. Has been done.

Next, in order to confirm the temperature rise and stability of the conductive catalyst 11 due to ignition, the temperature of the conductive catalyst 11 is detected by the catalyst temperature detecting means 15, and the detected temperature of the conductive catalyst 11 is detected. Determines whether the temperature has reached the set temperature (step 180). When the temperature of the conductive catalyst 11 has reached the set temperature, the power supply to the conductive catalyst 11 is stopped (step 190) and the indoor hot air supply fan 27 is operated (step 200), whereby the indoor temperature is increased. The air is supplied, and then the fuel and air supply is adjusted to the set arbitrary combustion amount (step 210).

In the above-described embodiment, the conductive catalyst 11 is energized prior to the energization of the heater of the vaporizer 5 to raise the temperature of the conductive catalyst 11 to the active temperature, so that the vaporizer 5 is activated at the time of ignition. When the heater is energized, the vaporized gas generated from the fuel remaining in the vaporizer 5 is reacted with the activated conductive catalyst 11 to be discharged as unburned gas into the room as it is. Can be prevented.

FIG. 3 is a flow chart showing the operation at the time of extinguishing a fire according to the second embodiment of the present invention.

The structure of the catalytic combustion apparatus used in the second embodiment shown in the figure is the same as that shown in FIG.

In the fire extinguishing process shown in FIG. 3, first, the operation switch of the operation panel 29 is turned off (step 31).
0), the operation of the fuel pump 3 is stopped (step 32).
0). Next, in order to keep the temperature of the conductive catalyst 11 at a sufficiently active temperature, the conductive catalyst 11 is energized (step 330), thereby heating the conductive catalyst 11.

After the heater of the vaporizer 5 is energized and heated for a sufficient time to vaporize all the fuel remaining in the vaporizer 5 (step 340), the heater of the vaporizer 5 is heated. The energization is stopped (step 350), the operation of the combustion air supply fan 7 is stopped (step 360), and the energization to the conductive catalyst 11 is stopped (step 370).

Then, after confirming that the temperature of the conductive catalyst 11 has dropped below a predetermined set temperature (step 3)
80), the operation of the indoor hot air supply fan 27 is stopped (step 390), thereby stopping the fire extinguishing operation.

In the above embodiment, when the normal combustion is extinguished, the fuel pump 3 is stopped and then the heater of the carburetor 5 is energized for a sufficient time to vaporize all the fuel remaining in the carburetor 5. During this period, the conductive catalyst 11 is energized,
Since the conductive catalyst 11 is maintained at the activation temperature and the remaining vaporized fuel is decomposed, the fuel does not remain in the vaporizer 5, and therefore the vaporizer 5 is heated when re-ignited. It is possible to prevent the unburned gas generated due to the residual fuel in 5 from being discharged into the room.

FIG. 4 is a flow chart showing the operation at the time of extinguishing the fire according to the third embodiment of the present invention.

The structure of the catalytic combustion apparatus used in the third embodiment shown in the same figure is the same as that shown in FIG. 1, and the process shown in FIG. 4 is step 320 in the process shown in FIG. And 330 are different from each other in that a fuel air supply amount reduction process is added as step 325, the other processes are the same, and the same process is denoted by the same step number.

That is, in the process of FIG. 4, after the operation of the fuel pump 3 is stopped in step 320, the operation of the combustion air supply fan 7 is adjusted to reduce the fuel air supply amount (step 325). In this way, the reaction decomposition can be efficiently performed without lowering the concentration of a small amount of unburned gas remaining in the vaporizer 5 and without lowering the temperature of the electrically conductive catalyst 11 that is electrically heated. ing.

FIG. 5 is a flow chart showing the operation at the time of extinguishing the fire according to the fourth embodiment of the present invention.

The structure of the catalytic combustion apparatus used in the fourth embodiment shown in the figure is the same as that shown in FIG. 1, and the process shown in FIG. 5 is the same as that shown in FIG. Instead of, the process of checking whether or not the temperature of the conductive catalyst 11 due to energization has reached the set temperature is used as step 335, and the difference is that the process of step 380 is omitted. Are the same, and the same steps are given the same step numbers.

That is, in the process of FIG. 5, after the conductive catalyst 11 is energized in step 330, it is assumed that the temperature of the conductive catalyst 11 has risen to the set temperature in the process of FIG. While I was doing it,
In the process of FIG. 5, it is checked whether or not the temperature of the conductive catalyst 11 has reached the set temperature (step 335). Then, after confirming that the temperature of the conductive catalyst 11 has reached the set temperature, the process proceeds to the next process.

Therefore, it goes without saying that the embodiment of FIG. 5 can also achieve the same effect as that of the embodiment of FIG.

[0039]

As described above, according to the present invention,
Prior to energizing the vaporizer at the start of operation, energize the self-heating type conductive catalyst, and after confirming that the temperature of the self-heating type conductive catalyst reached a predetermined temperature, After energizing, the fuel pump that supplies fuel to the vaporizer is then activated, so the vaporized gas generated from the fuel remaining in the vaporizer during ignition reacts with the activated conductive catalyst, It is possible to prevent the unburned gas from being discharged into the room as it is, and it is possible to maintain a clean state without being discharged in the form of white smoke.

Further, according to the present invention, after the fuel supply by the fuel pump is stopped when the operation is stopped, the vaporizer and the self-heating type conductive catalyst are energized for a predetermined time, so that they remain in the vaporizer. Since vaporized fuel is decomposed and no fuel remains in the vaporizer, it prevents the unburned gas generated due to the residual fuel in the vaporizer from being discharged indoors when the vaporizer is heated during re-ignition. be able to.

Further, according to the present invention, when the carburetor and the self-heating type conductive catalyst are energized for a predetermined time after the fuel supply by the fuel pump is stopped when the operation is stopped, the combustion air is kept at a predetermined amount or less. Since it is squeezed and supplied, without reducing the concentration of a small amount of unburned gas remaining in the vaporizer,
In addition, the reaction catalyst can be efficiently decomposed without lowering the temperature of the electrically conductive catalyst that is being electrically heated, and when the carburetor is heated during re-ignition, it is unburned due to the residual fuel in the carburetor. It is possible to prevent the gas from being discharged into the room.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a catalytic combustion apparatus that implements a control method according to a first embodiment of the present invention.

FIG. 2 is a flow chart showing the operation of the catalytic combustion device shown in FIG.

FIG. 3 is a flowchart showing the operation of the second embodiment of the present invention.

FIG. 4 is a flowchart showing the operation of the third embodiment of the present invention.

FIG. 5 is a flowchart showing the operation of the fourth embodiment of the present invention.

[Explanation of symbols]

1 fuel tank 3 fuel pump 5 vaporizer 7 Combustion air supply fan 11,19 Self-heating conductive catalyst 15 Catalyst temperature detection means 25 outlet 27 Indoor hot air supply fan 29 Operation panel

Front page continuation (72) Kazuo Saito Inventor Kazuo Saito 8 Shinsita-cho, Isogo-ku, Yokohama-shi, Kanagawa, Toshiba Research Institute for Living Space Systems (56) Reference JP-A-6-272821 (JP, A) JP-A-5 -196211 (JP, A) JP-A-6-147471 (JP, A) JP-A-8-54114 (JP, A) JP-A-8-100920 (JP, A) (58) Fields investigated (Int.Cl) . ⁷ , DB name) F23D 11/40 F23D 14/18 F23N 5/02 F23N 5/20

Claims (4)

(57) [Claims] 1. A method of controlling a catalytic combustion device, wherein a mixture of fuel and air vaporized in a vaporization chamber is brought into contact with a heated self-heating type conductive catalyst to burn the mixture, and a method for controlling the vaporizer at the start of operation is provided. Prior to energizing, the self-heating type conductive catalyst is energized, and after confirming that the temperature of the self-heating type conductive catalyst has reached a predetermined temperature, the heater of the carburetor is energized and then vaporized. A method for controlling a catalytic combustion device, comprising: operating a fuel pump that supplies fuel to the reactor. 2. A method for controlling a catalytic combustion device, wherein a mixture of fuel and air vaporized in a vaporization chamber is brought into contact with a heated self-heating type conductive catalyst for combustion, and the fuel is supplied by a fuel pump when the operation is stopped. A method for controlling a catalytic combustion device, comprising energizing the vaporizer and the self-heating type conductive catalyst for a predetermined time after stopping the supply of the gas. 3. When the carburetor and the self-heating type conductive catalyst are energized for a predetermined time after the fuel supply by the fuel pump is stopped when the operation is stopped, the combustion air is squeezed to a predetermined amount or less and supplied. The method for controlling a catalytic combustion device according to claim 2, wherein: 4. A method of controlling a catalytic combustion device, wherein a mixture of fuel and air vaporized in a vaporization chamber is brought into contact with a heated self-heating type conductive catalyst to burn the mixture, and the fuel is pumped by a fuel pump when the operation is stopped. After stopping the supply of, the self-heating type conductive catalyst is energized for a predetermined time, and after confirming that the temperature of the self-heating type conductive catalyst has dropped to a predetermined temperature, the self-heating type conductive catalyst A method for controlling a catalytic combustion device, characterized by stopping energization.