JPH10300025A - Liquid fuel vaporizing combustion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable starting of a vaporizer, lowering of a running cost for temperature adjustment and starting of the vaporizer in a short time by providing a burner for receiving heat which is disposed independently of a main burner for heating the heat receiving part of the vaporizer. SOLUTION: A burner head 30 is divided into an area (an auxiliary burner head 60) adjacent to fins 46 and 56 of two vaporizers 40 and 50 and other areas (a main burner head 62). The degree of combustion can be adjusted at the main burner head 62 by properly adjusting the degree of combustion at an auxiliary burner head 60. In this manner, the shortage of heat at a main vaporizer 40 is compensated for by increasing the degree of combustion at the auxiliary burner head 60. This enables lowering of a running cost as compared with the case of compensating for the shortage of heat with a heater while shortening the time up to the start of combustion at the main burner head 62.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid fuel vaporization and combustion apparatus in which a gaseous fuel obtained by vaporizing a liquid fuel is mixed with air in a mixing chamber to burn a mixture produced by a burner head. In particular, the present invention relates to a vaporization combustion device used for a water heater.

[0002]

2. Description of the Related Art FIG. 3 is a vertical sectional view showing an example of a conventionally known evaporative combustion apparatus. Referring to this figure, the general configuration and operation of the vaporization combustion device will be described.
It is roughly as follows. First, when the apparatus is started, the vaporizer 12 having the vaporizing surface 13 is heated by the heater 14, and when the temperature reaches a temperature at which the liquid fuel 18 stored in the fuel tank 16 evaporates, the pump 20 is started. Is done. As a result, the liquid fuel 18 is sucked from the fuel tank 16 into the liquid sending pipe 22, and is ejected or dropped from the nozzle 24 at the tip of the liquid sending pipe 22 to the vaporizing surface 13. The liquid fuel 18 jetted or dropped on the vaporizing surface 13 is vaporized to become gaseous fuel and flows into the mixing chamber 26. Air is supplied to the mixing chamber 26 from a blowing port 28 by a blowing mechanism (not shown).
The gaseous fuel flowing into the mixing chamber 26 as described above is sufficiently mixed therewith with the air. When the mixture thus obtained is ejected into the combustion chamber 32 from a large number of flame ports 33 provided in the burner head 30 and ignited by the igniter 34, the mixture starts burning and a flame 35 is generated. I do.

Next, the operation during combustion will be described.
The vaporizer 12 shown in FIG. 3 includes a heat receiving portion facing the burner head 30, from which a part of the combustion heat generated by the burner head 30 is absorbed and transmitted to the entire vaporizer 12. . That is, while the air-fuel mixture is burning in the burner head 30, the vaporizer 12 is heated by two kinds of heat, the heat from the heater 14 and the combustion heat from the burner head 30, and these heats Liquid fuel is vaporized.

[0004] In the above-described vaporizing and burning apparatus, if the temperature of the vaporizing surface 13 is too low, all the liquid fuel ejected or dropped there is not vaporized, while if the temperature is too high, heat is wasted. In addition, there arises a problem that the liquid fuel causes film boiling on the vaporizing surface 13 and is not properly vaporized. For this reason, at the time of combustion, the temperature of the vaporizing surface 13 is always the temperature at which the liquid fuel can be appropriately vaporized (hereinafter, this temperature is referred to as “set temperature”).
For example, it is necessary to keep the temperature at about 250 ° C. for kerosene).

In order to keep the temperature of the vaporizer 12 constant, the heat input to the vaporizer 12 and the heat output from the vaporizer 12 may be balanced. Therefore, when looking at the flow of heat during combustion, first, heat input to the vaporizer 12 mainly consists of heat from the heater 14 and combustion heat from the burner head 30. On the other hand, the heat output from the vaporizer 12 mainly consists of the heat of vaporization of the liquid fuel, the heat given to the air mixed with the gaseous fuel, and the heat radiation from the vaporizer 12 itself.

[0006] By the way, in a vaporization combustion device actually used (for example, a vaporization combustion device for a water heater), it is often the case that a user can change a combustion amount according to a purpose. However, while the amount of heat of vaporization is proportional to the amount of combustion, the amount of heat received is not proportional to the amount of combustion because the heat receiving efficiency of the carburetor 12 is not constant but changes according to the amount of combustion.
The amount of heat of vaporization is not proportional to the amount of heat received.
For example, the ratio of the amount of heat received from the heat receiving unit 15 to the amount of heat output from the carburetor 12 changes in accordance with the change in the amount of combustion because the amount of heat released from the unit is not proportional to the amount of combustion. Further, even if the combustion amount is fixed, the amount of heat output changes when the temperature of the air flowing into the mixing chamber 26 changes. For the above reasons, for example, in a certain combustion state, the carburetor 1
2 may exceed the amount of heat received from the burner head 30.

Therefore, in the evaporative combustion apparatus shown in FIG. 3, the amount of heat supplied to the evaporator 12 is balanced by appropriately adjusting the amount of electricity supplied to the heater 14. That is, the temperature of the vaporizer 12 is monitored on the basis of an output signal of a not-shown temperature measuring device such as a thermistor, and feedback control based on the monitored temperature change is performed by a not-shown control device such as a microcomputer. Thus, the amount of electricity supplied to the heater 14 is appropriately adjusted, and the output of the temperature detector is stabilized at an output value corresponding to the set temperature. Thereby, the temperature of the carburetor 12 during combustion can be maintained at the set temperature.

When the above-described evaporative combustion apparatus is used in a water heater, the heater 14 is energized even during non-combustion to reduce the time required to generate hot water.
In general, the amount of heat input from the heat exchanger 4 and the amount of heat radiation from the vaporizer 12 are balanced so that the vaporizer 12 is kept warm.

[0009]

During the use of the above-described vaporization and combustion apparatus, the heater is always energized for heating the vaporizer and controlling the temperature. Specifically, about 800 W is required at the time of startup, about 400 W at the time of combustion, and about 200 W at the time of keeping the vaporizer warm. In this way, when using a heater for heating the vaporizer or controlling the temperature,
Since a large amount of electricity is consumed, there is a problem that running cost is large.

[0010] It takes several minutes to start up the vaporization and combustion apparatus. To shorten the time, it is necessary to increase the amount of power to the heater at the time of startup. Since the upper limit (15A, 20A, etc.) is set for the possible amperage, if the amount of power supplied to the heater is excessive, use of other electric appliances may be hindered.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to reduce the running cost for starting up the vaporizer and controlling the temperature and to reduce the running time. An object of the present invention is to provide a vaporization and combustion device that can start a vaporizer.

[0012]

According to the present invention, there is provided a vaporization and combustion apparatus according to the present invention, in which a liquid fuel is vaporized by a vaporizer having a heat receiving portion facing a burner head of a main burner. In a liquid fuel vaporization and combustion apparatus that generates fuel and burns the gaseous fuel on the burner head, a heat receiving part burner provided independently of the main burner to heat the heat receiving part of the vaporizer is provided. It is characterized by having.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A vaporization combustion apparatus according to the present invention is provided independently of a main burner in a vaporization combustion apparatus including a vaporizer having a heat receiving portion facing a burner head of a main burner. By appropriately heating the heat receiving section of the vaporizer with the heat receiving section burner, the heat required for controlling the temperature of the vaporizer during combustion of the main burner and keeping the vaporizer warm during standby for warming is supplied to the vaporizer. It was done. Here, the expression that the heat receiving section burner is provided “independently of the main burner” means that the combustion control (ignition, fire extinguishing, change of combustion amount, etc.) of the heat receiving section burner is independent of the main burner combustion control. Means you can do it. According to such a configuration, the temperature of the vaporizer can be controlled at a lower cost than the device using the electric heater, and the time required for starting the vaporizer can be reduced.

In the evaporative combustion apparatus according to the present invention, a temperature detecting means for detecting a temperature of the vaporizer, and a control means for controlling a combustion amount of the heat receiving portion burner based on an output signal of the temperature detecting means. And a burner control means for the heat receiving section. With this configuration, the combustion amount of the heat receiving section burner can be automatically controlled by feedback control based on the output signal of the temperature detecting means.

In the evaporative combustion apparatus according to the present invention, the heat receiving section burner and the main burner may be provided side by side on the same plane. With this configuration, the heat receiving portion burner also functions as a part of the main burner, so that the heat from the heat receiving portion burner can be used with higher efficiency.

As one mode of the vaporizing combustion apparatus in which the burner for the heat receiving section and the main burner are juxtaposed, for example, a burner head of the main burner is connected to a carburetor heating section adjacent to the heat receiving section of the carburetor. There is a vaporization / combustion device which is divided into a main heating section composed of portions other than the vaporizer heating section so that the combustion of the vaporizer heating section can be controlled independently of the combustion of the main heating section.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a vaporization and combustion apparatus according to the present invention will be described with reference to FIG. In FIG. 1, (a) is a vertical sectional view showing a schematic configuration of the evaporative combustion apparatus of the present embodiment, and (b) is a horizontal sectional view taken along line BB of (a).

In the evaporative combustion apparatus of the present embodiment, FIG.
As shown in FIG. 2, two large and small vaporizers are arranged side by side on one side of the burner head 30 with a partition 49 interposed therebetween. The larger one of these vaporizers will be referred to as the main vaporizer 40, and the smaller one will be referred to as the auxiliary vaporizer 50.

The main vaporizer 40 has fins 46 and a vaporizing surface 41 and can be heated by the first heater 42. A nozzle 44 provided at the tip of the first liquid sending pipe 43 faces the vaporizing surface 41 of the main vaporizer 40. On the other hand, the auxiliary vaporizer 50 similarly has the fins 56 and the vaporizing surface 51 and can be heated by the second heater 52. A nozzle 54 provided at the tip of the second liquid feed pipe 53 faces the vaporizing surface 51 of the auxiliary vaporizer 50. The ends of both liquid feed pipes 43 and 53 are immersed in the liquid fuel 18 stored in the fuel tank 16. Further, a first pump 45 and a second pump 55 are provided in the middle of each of the liquid feeding pipes 43 and 53. The temperatures of the main vaporizer 40 and the auxiliary vaporizer 50 are detected by a first temperature measuring device (not shown) and a second temperature measuring device 57.

As shown in FIG. 1B, the burner head 30 includes fins 46 and 5 of two vaporizers 40 and 50.
6 (hereinafter, referred to as “auxiliary burner head 60”) and other regions (hereinafter, referred to as “main burner head 62”). The igniter 34 is disposed so as to face the auxiliary burner head 60.

In accordance with the division of the burner head 30 as described above, the mixing chamber provided below the burner head 30 is also divided into an auxiliary mixing chamber 64 and a main mixing chamber 66.
The auxiliary mixing chamber 64 forms a part of a gas flow path from the vaporizing surface 51 of the auxiliary vaporizer 50 to the flame port 33 of the auxiliary burner head 60. Similarly, the main mixing chamber 66 extends from the vaporizing surface 41 of the main vaporizer 40 to the flame outlet 3 of the main burner head 62.
3 constitutes a part of the gas flow path.

The controller 70 includes a first heater 42, a second heater 52, a first temperature sensor, a second temperature sensor 57, and an igniter 3.
4. It is connected to the first pump 45 and the second pump 55, and appropriately controls the operation of the heater, the igniter, and the pump based on output signals of the first temperature detector and the second temperature detector 57.

The operation of the evaporative combustion apparatus having the above configuration at the time of startup is as follows. First, when the control device 70 starts energizing the second heater 52, the auxiliary vaporizer 50
Temperature rises. At this time, the control device 70 monitors the temperature of the auxiliary vaporizer 50 based on the output signal of the second temperature detector 57. When the temperature of the auxiliary vaporizer 50 reaches the set temperature,
The control device 70 starts the second pump 55. As a result, the liquid fuel 18 is sucked into the second liquid supply pipe 53 and is ejected from the nozzle 54 at the tip thereof to the vaporization surface 51 of the auxiliary vaporizer 50. The ejected liquid fuel receives heat from the vaporizing surface 51 of the auxiliary vaporizer 50 and vaporizes. The gaseous fuel thus generated flows into the auxiliary mixing chamber 64 by blowing air from the blowing port 28, where it is sufficiently mixed with air, and then blows out from the flame port 33 of the auxiliary burner head 60 into the combustion chamber 32. on the other hand,
The control device 70 starts the intermittent ignition operation by the igniter 34 at the same time as or slightly after the second pump 55 is started as described above. When a mixture of air and gaseous fuel is ejected from the flame port 33 as described above, the spark generated by the igniter 34 ignites the mixture, and combustion in the auxiliary burner head 60 is started.

A part of the combustion heat generated by the combustion of the air-fuel mixture in the auxiliary burner head 60 is absorbed by the main carburetor 40 from the fins 46. Thereby, the temperature of the main vaporizer 40 rises. At this time, the control device 70 monitors the temperature of the main vaporizer 40 based on the output signal of the first temperature detector. When the temperature of the main vaporizer 40 reaches the set temperature, the control device 70 starts the first pump 45.
As a result, the liquid fuel 18 is sucked into the first liquid sending pipe 43 and is ejected from the nozzle 44 at the tip thereof to the vaporizing surface 41 of the main vaporizer 40. The ejected liquid fuel receives heat from the vaporizing surface 51 of the auxiliary vaporizer 50 and vaporizes. The gaseous fuel thus generated flows into the main mixing chamber 66 by blowing air from the blowing port 28, where it is sufficiently mixed with air.
The fuel is jetted from the flame port 33 of the main burner head 62 into the combustion chamber 32. The flame of the auxiliary burner head 60 ignites the mixture of air and gaseous fuel thus ejected, and combustion in the main burner head 62 is started.

Next, the operation when the combustion amount of the main burner head 62 is changed during combustion will be described. The relationship between the heat input and the heat output in the carburetor 12 of the vaporization and combustion apparatus of FIG.
The same applies to 0. That is, depending on the amount of combustion, there is a case where the heat output from the main carburetor 40 cannot be entirely compensated only by the heat of combustion from the burner head 30. In such a case, in the evaporative combustion apparatus of the present embodiment, the control device 70 increases the amount of electricity supplied to the second heater 52 and increases the liquid feeding force of the second pump (for example, the rotation speed of the plunger pump). . Then, the amount of combustion in auxiliary burner head 60 increases, and accordingly, the amount of heat input to main carburetor 40 also increases. By appropriately adjusting the amount of combustion in the auxiliary burner head 60 in this manner,
The amount of combustion in the main burner head 62 can be adjusted. If the shortage of heat in the main carburetor 40 is compensated for by increasing the amount of combustion in the auxiliary burner head 60, the running cost can be reduced as compared with the case where the shortage of heat is compensated for by the heater.

According to the above configuration, since the second heater 52 is used only for adjusting the temperature of the relatively small auxiliary carburetor 50, the conventional vaporization combustion in which the entire large carburetor is heated by the heater is used. The running cost can be reduced as compared with the apparatus. In addition, the auxiliary vaporizer 50
Since the heat capacity of the auxiliary heater 50 is small, the temperature of the auxiliary vaporizer 50 reaches the set temperature in a short time after the energization of the second heater 52 is started, and thereafter, the combustion heat obtained by burning the air-fuel mixture in the auxiliary burner head 60 Thus, the main carburetor 40 can be heated at a high speed, so that the time required to start the combustion in the main burner head 62 can be significantly reduced as compared with the conventional case.

The first heater 42 provided in the main carburetor 40 is not always essential for controlling the temperature of the main carburetor 40. However, the use of a heater enables fine temperature control. Therefore, if the first heater 42 is provided as shown in FIG. 1B, for example, after the temperature of the main carburetor 40 is roughly adjusted by adjusting the combustion amount in the auxiliary burner head 60, the first heater 42 is further provided. Temperature control, such as performing fine temperature control by adjusting the amount of power supplied to the power supply, is possible.

Next, a second embodiment of the vaporization and combustion apparatus according to the present invention will be described with reference to FIG. In FIG.
(A) is a vertical sectional view showing a schematic configuration of the evaporative combustion apparatus of the present embodiment, (b) is a horizontal sectional view taken along the line BB of (a), and (c) is a C- line of (a). It is a vertical sectional view in the C line.

The vaporization and combustion apparatus of the present embodiment includes the same vaporizer 12 (hereinafter, this vaporizer is referred to as "main vaporizer 12") used in the vaporization and combustion apparatus of FIG. The temperature is detected based on the output signal of the first temperature detector 58. The heater 14 shown in FIG. 3 is hereinafter referred to as “first heater 14”. Main vaporizer 1
2, the same liquid supply pipe 2 as shown in FIG.
2. The liquid fuel 18 stored in the fuel tank 16 is supplied by the nozzle 24 and the pump 20. Hereinafter, the liquid supply pipe 22 is referred to as a first liquid supply pipe 22 and the pump 20 is referred to as a first pump 20.

In addition to the main carburetor 12 as described above, the vaporization and combustion apparatus of the present embodiment includes an auxiliary carburetor 80. The auxiliary vaporizer 80 has a heating element 83 provided with a second heater 82 at the bottom of a vaporizing chamber 81 made of a heat insulating material. The temperature of the heating element 83 is detected based on the output signal of the second temperature detector 87. On the upper surface of the heating element 83, the tip of a second liquid feed pipe 84 inserted into the vaporization chamber 81 from the outside faces. The end of the second liquid supply pipe 84 is immersed in the liquid fuel 18 stored in the fuel tank 16. A second pump 85 is provided in the middle of the second liquid sending pipe 84.

As shown in FIG. 2B, the burner head 30 is divided into an auxiliary burner head 60 consisting of a region adjacent to the fin 15 of the main carburetor 12 and a main burner head 62 consisting of other regions. Have been.

In accordance with the division of the burner head 30 as described above, the mixing chamber provided below the burner head 30 is also divided into an auxiliary mixing chamber 86 and a main mixing chamber 88.
The auxiliary mixing chamber 86 and the vaporizing chamber 81 of the auxiliary vaporizer 80 communicate with each other via an opening 90 provided at a lower part of the auxiliary mixing chamber 86. Further, another opening 89 is provided on the side of the auxiliary mixing chamber 86, whereby the auxiliary mixing chamber 8 is provided.
6 constitutes a part of a gas flow path from the main vaporizer 12 to the flame port 33 of the auxiliary burner head 60. On the other hand, a main mixing chamber 88 having a shape surrounding the side surface of the auxiliary mixing chamber 86 constitutes a part of a gas flow path from the vaporizing surface 13 of the main vaporizer 12 to the flame outlet 33 of the main burner head 62. ing.

The controller 70 is connected to the first heater 14, the second heater 82, the first temperature detector 58, the second temperature detector 87, the igniter 34, the first pump 20 and the second pump 85, Based on the output signals of the first temperature measuring device 58 and the second temperature measuring device 87, the operation of the heater, the igniter and the pump is appropriately controlled.

The procedure for sequentially starting the auxiliary carburetor 80 and the main carburetor 12 in the vaporization and combustion apparatus having the above-described configuration is performed by the auxiliary carburetor 50 and the main carburetor 40 in the vaporization and combustion apparatus of the embodiment shown in FIG. Is almost the same as the procedure for starting according to.

In the auxiliary vaporizer 80 of this embodiment, not only the heat capacity is reduced by making the size of the auxiliary vaporizer 80 smaller than that of the conventional vaporizer, but also the heating element 8
3 is effectively suppressed by the vaporization chamber 81 made of a heat insulating material.
Can be reduced to a short time of about several seconds. Further, the amount of electricity to be supplied to the second heater 82 for keeping the auxiliary carburetor 80 warm and standby is much smaller than the amount of electricity for keeping the conventional carburetor warm and standby. Can be reduced. Furthermore, at the time of combustion, the shortage of heat in the main carburetor 40 can be compensated for by an increase in the amount of combustion in the auxiliary burner head 60, so that the running cost is reduced as compared with the case where the shortage of heat is compensated for by the heater. be able to.

As described above, the embodiment of the vaporization combustion apparatus according to the present invention has been specifically described with reference to the drawings. However, the embodiment is not limited to the above-described embodiment, and various modifications are possible within the spirit and scope of the present invention. Needless to say, various modifications are possible.

[Brief description of the drawings]

FIG. 1A is a vertical sectional view showing a schematic configuration of a vaporizing combustion apparatus according to a first embodiment, and FIG. 1B is a horizontal sectional view taken along line BB in FIG.

2A is a vertical sectional view showing a schematic configuration of the vaporization combustion apparatus of the present embodiment, FIG. 2B is a horizontal sectional view taken along line BB in FIG. 2A, and FIG. FIG. 4 is a vertical sectional view taken along line C.

FIG. 3 is a vertical cross-sectional view showing an example of a conventionally known evaporative combustion apparatus.

[Explanation of symbols]

 12 vaporizer (main vaporizer) 14 heater (first heater) 15, 46, 56 fin 30 burner head 40 main vaporizer 42 first heater 49 partition 50, 80 auxiliary vaporizer 52 82 second heater 60 auxiliary burner head 62 main burner head 64, 86 auxiliary mixing chamber 66, 88 main mixing chamber

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Makoto Hatakeyama 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu-city, Fukuoka Prefecture Totoki Equipment Co., Ltd. (72) Hiroshi Ishikawa 2 Nakajima, Kokurakita-ku, Kitakyushu-shi, Fukuoka Prefecture No. 1-1, Toto Kiki Co., Ltd. (72) Inventor Nobuhisa Sasaki No. 43-1, Uozakihama-cho, Higashinada-ku, Kobe Nippon Euro Corporation

Claims (4)

[Claims] 1. A liquid fuel vaporization and combustion apparatus which vaporizes liquid fuel by a vaporizer having a heat receiving portion facing a burner head of a main burner to generate gaseous fuel and burns the gaseous fuel on the burner head. A liquid fuel vaporization and combustion device comprising a heat receiving part burner provided independently of the main burner to heat the heat receiving part of the vaporizer. 2. A temperature detecting means for detecting a temperature of the vaporizer, and a burner control means for a heat receiving section for controlling a combustion amount of the heat receiving section burner based on an output signal of the temperature detecting means. The liquid fuel vaporization and combustion apparatus according to claim 1, further comprising: 3. The liquid fuel vaporization and combustion apparatus according to claim 1, wherein the heat receiving section burner and the main burner are arranged side by side on the same plane. 4. A burner head of the main burner is divided into a carburetor heating section adjacent to a heat receiving section of the carburetor and a main heating section including a portion other than the carburetor heating section. The liquid fuel vaporization combustion apparatus according to any one of claims 1 to 3, wherein the combustion of the fuel can be controlled independently of the combustion of the main heating unit.