JPH07158820A - Combustion machine with two-stage heating and gasification mechanism at liquid fuel combustion system - Google Patents

Abstract

PURPOSE:To reduce an electromotive force and make a substantial high ratio of combustion adjustment by employing a two-stage heating and gasification mechanism in a fuel gasification system. CONSTITUTION:Fuel is supplied from a fuel supplying mechanism (a) to a heat-resistant porous member (m), the heat-resistant porous member (m) is heated with a heating mechanism (c), pre-mixed gas is made under an action of air flow supplied by an air supplying mechanism (b) and ignited at a combustion port 2. A heating and gasification mechanism 3 is surplus heated with a heat transfer of the pre-mixed flame, fuel supplied by either the fuel supplying mechanism (a) or (d) is gasified, mixed with air flow blown by the air supplying mechanism (b) or other air supplying mechanisms, resulting in forming the pre-mixed fuel. This pre-mixed fuel is injected from a combustion port 4 set at an outside part of the combustion port 2, ignited with flame at the combustion port 2 to become the pre-mixed flame. Even if no flame is formed from either one of both combustion ports, the heating and gasification mechanism 3 is designed to receive transferred heat for generating flame at the combustion port 4. With such an arrangement as above, after accomplishing the flame at the combustion port 4, it is possible to terminate the flame at the combustion port 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-stage heating vaporization mechanism burner in a liquid fuel combustion system.

[0002]

2. Description of the Related Art A conventional premixing burner based on a liquid fuel heating vaporization system is used as a thermal energy source for the heating vaporization mechanism.
Either the electric power was used or the method of transferring the heat energy source of combustion to the heating mechanism by residual heat by the electric power was used.

[0003]

[Problems to be Solved by the Invention] With the method using electric power, a large amount of electric power was required to supply a premixed fuel to a high-power burner. In addition, in the method of vaporizing by heat transfer, the vaporizing section is inevitably large, and the consumption of residual heat power is large.

The first-stage burner is used to heat the heat-resistant porous material (m) supplied with fuel by heating with electric power and quickly start combustion by using the premixed gas generated by the action with the air flow. 2 by the combustion heat energy
If the heating vaporizer of the first stage can be heated with a large amount of heat energy, it consumes less power and starts up quickly.
A burner with a large combustion throttle ratio can be created.

[0005]

[MEANS FOR SOLVING THE PROBLEMS] A heat-resistant porous body (m) supplied with fuel by electric power from the first stage heating vaporization mechanism.
Is heated to generate a premixed fuel for start-up by the action of the air flow and burned. The second stage heating vaporization mechanism is preheated by the heat transfer by the combustion heat energy to create and burn the premixed fuel.

[0006]

The operation will be described with reference to the first embodiment shown in FIG. 1. The fuel vaporizer (1) provided with the fuel supply mechanism (a), the air supply mechanism (b), and the heating mechanism (c) for the first-stage combustion.
In the above, the fuel is supplied from the fuel supply mechanism (a) to the heat-resistant porous body (m), and the fuel is heated from the heat-resistant porous body (m) by the heating mechanism (c) and supplied from the air supply mechanism (b). The method of vaporization premixing by the action with the air flow to be generated,
It is called a fuel vaporizer (1). A pre-mixture is created by and burned at the combustion port (2). 2. Due to the heat transfer of the premixed flame, the heating vaporization mechanism (3) is preheated to vaporize the fuel supplied by the fuel supply mechanism (a) or the fuel supply mechanism (d), and the air supply mechanism (b) or It mixes with the air flow being blown by the air supply mechanism and becomes a premixed fuel. 3. This premixed fuel is ejected from the combustion port (4) set outside the combustion port (2) and is ignited by the flame of the combustion port (2) to become a premixed flame. 4. After the flame of the combustion port (4) is established, the heating vaporization mechanism (3)
Is heated by the flame of the combustion port (2) and the combustion port (4). However, the heating vaporization mechanism (3) is designed to receive heat transfer sufficient to generate the flame of the combustion port (4) even when the flame of either of the combustion ports is not established. 5. As a result, after the flame of the combustion port (4) is established, even if the flame of the combustion port (2) is stopped, the flame of the combustion port (4) is established, so that the electric power required for fuel vaporization is unnecessary.

[0007]

EXAMPLES Examples will be described with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention. The fuel supply mechanism employs two systems (a) and (d), but one system of the fuel supply mechanism (a) simultaneously feeds oil to the fuel vaporizer (1) and the heating vaporization mechanism (3). Even if it does, since the residual heat of the heating vaporization mechanism (3) is rapidly generated by the combustion heat, it is possible to design a burner having no problem in practice. However, the method of FIG. 1 is easier to obtain a large combustion throttle ratio.

FIG. 1 shows a fuel supply mechanism.
Although the two mechanisms of (a) and (d) and two operation valves are set, the same operation can be realized by setting two operation valves in the fuel supply mechanism (a). A wick may be used as the fuel supply mechanism (a).

Regarding the adjustment of the supply air amount ratio of the combustion port (2) and the combustion port (4), an air amount adjusting device such as a damper may be attached to each air supply pipe to adjust the air amount. In the example, the air amount is adjusted in advance by appropriately designing the air supply pipe, and the fine adjustment is performed by adjusting the heating amount of the heating mechanism (c) or the fuel supply of the fuel supply mechanism (a) and the fuel supply mechanism (d). The amount shall be adjusted. Further, the total air amount is adjusted by adjusting the rotation speed of the fan or the like when using an air amount adjusting device such as a damper or a fan or the like as the air supply mechanism (b). Also, the combustion port (2),
The air supply mechanism of (4) may use independent devices.

The heating vaporization mechanism (3) is located at the combustion port (2).
It does not matter as long as it is a position where the heat conduction of the flame of the combustion port (4) can be appropriately received. In this embodiment, the position where the heat conduction of the combustion port (2) can be most effectively received is illustrated. The same applies to the position of the combustion port (4).

When a measure against unburned gas is required, the unburned gas shutoff device (9) may be installed in the fuel vaporizer (1).

FIG. 2 shows an example of the structure of the heating vaporization mechanism (3) installed horizontally. The fuel oil introduced into the vaporization chamber (f) by the oil supply pipe (e) is vaporized by heat conduction from the burner and is heated uniformly in the process of passing between the two oil stop plates (g). It is ejected from the ejection port set in the vaporization mechanism (3) and mixed with the air flow supplied from the air supply mechanism (b) to form a premixed gas.

FIG. 3 shows a second embodiment of the present invention. This is an example in which a secondary air flow pipe (h) supplied from the air supply mechanism (b) is set outside the device of FIG. 1.

FIG. 4 shows an example of the structure of the fuel vaporization mechanism (3) installed vertically. The fuel oil is vaporized by heat conduction from the burner, and is uniformly ejected from the ejection port set in the heating vaporization mechanism (3) in the process of passing between the oil stop plates (g).

FIG. 5 shows an example of the structure of the heating vaporization mechanism (3). The fuel oil is vaporized by the heat conduction from the burner and jetted out by the air supply pipe (i). Further, instead of the air supply pipe (i), the air may be ejected by the air supply port (n).

FIG. 6 shows an example of the structure of the heating vaporization mechanism (3). The fuel oil is vaporized by heat conduction from the burner, passes through the air supply pipe (j) and is mixed with the air flow supplied from the jet air supply mechanism (b) by the open state of the on-off valve (k) to form a premixed gas. , Is closed by the closed state of the on-off valve (k).

FIG. 7 shows a third embodiment of the present invention. Although the basic structure is the same as the method of FIG. 1, when burning by the combustion port (4), the method of FIG. 6 is adopted as the structure of the heating vaporization mechanism (3), and swirling the air flow by the stationary blade (5). Flow is generated and the vaporized fuel ejected from the air supply pipe (j) is mixed with the air flow by the open state of the on-off valve (k), and the swirling flow is stopped by the stationary blades (6) provided near the combustion port (4). It is a structure that allows it to burn. The method of mixing the vaporized fuel and the swirling air flow may be either a forward flow type or a reverse flow type with respect to the air flow. Further, the stationary blade (6) is used for the structure of the combustion port (4) in which the swirling flow adversely affects the combustion of the combustion port (4).

FIG. 8 shows a part of the fourth embodiment of the present invention. In the third embodiment, an air flow is introduced from the side by an air supply pipe (7) to create a swirl flow, as opposed to a system in which a swirl flow is created by a stationary blade (5).

Here, an example of measures against unburned gas for the embodiment of the present invention will be described. When extinguishing a fire, the unburned gas in the combustion port (4) is quickly burned in a fire extinguishing mode in which the air flow is not stopped for a while. Since it has a function of flowing out to the outside of the machine and burning it, it is effective as a measure against unburned gas at the combustion port (4). On the other hand, even if the heating of the vaporization section of the fuel vaporizer (1) is stopped, the vaporization of the fuel may not immediately stop, so it may be disadvantageous as a measure against unburned gas at the combustion port (2). is there. However, regarding the extinguishing in the state where the combustion of the combustion port (2) is stopped while the combustion is continuing, the unburned gas cutoff device (9)
May not be necessary. Because the fuel vaporizer (1)
This is because the amount of unburned gas generated is very small when the internal vaporization section is cooled below the evaporation temperature of the fuel. The problem is when the fire extinguishing action occurs while both combustion ports are burning. If it is not an emergency stop, first of all, there is a measure to stop the unpleasant odor due to unburned gas by first stopping the combustion at the combustion port (2) and then after a while, stopping the combustion at the combustion port (4). . In this case, they are stopped at the same time in an emergency.

FIG. 9 shows a fifth embodiment of the present invention, which is an embodiment in the case where the conditions for measures against unburned gas such as a fan heater are severe. The basic configuration is based on the following design concept, and the fuel gas vaporized by the heat transfer from the flame of the combustion port (2) in the heating vaporization mechanism (3) is mixed with the air flow toward the combustion port (4). And make a premixed gas. In this embodiment, the air flow is swirled to uniformly mix with the fuel gas. In this case, compared to the method of swirling the premixed gas to produce a uniform air-fuel mixture, there is an advantage that it is not necessary to consider the phenomenon in which the swirling chamber is cooled in the initial stage of combustion and the fuel gas is condensed on the wall surface and ends up. is there. It incorporates an unburned gas cutoff device (9) that instantaneously cuts off residual vaporized gas generated even after heating of the fuel vaporizer (1) is stopped by electric power.

As the structure of the heating vaporization mechanism (3), there are a device without the vaporized gas shutoff device as shown in FIGS. 4 and 5 and a device as shown in FIG. From the point of view, an example is shown in which it is not installed. In addition, in the installed example, the main point of action is to suppress the generation of unburned gas accompanying the extinguishing of the combustion port (4).
Even if a combustion throttle that operates the combustion port (4) alone is used, unburned gas is unlikely to be generated when the fire is extinguished. Further, even if the two burners are stopped at the same time, there is an effect that unburned gas is not generated so much.

Each function will be described below.

The air supply mechanism (8) is composed of an electric fan, and a predetermined air amount is ensured by a rotation speed control device of the electric motor or an air flow adjusting device (8a). The wind box (8b) is a device for supplying air to each of the following air supply systems.

The air and fuel supply system to the combustion port (2) will be described. The air in the wind box (8b) is finely adjusted to an appropriate amount by the air flow adjusting device (2a) and is introduced into the fuel vaporizer (1) equipped with the unburned gas cutoff device (9).
The fuel vaporizer (1) is sucked up from the fuel storage tank (1) by a fuel supply mechanism (a) such as a wick and supplied with fuel. By the action of the supplied fuel, the heating device, the heat resistant porous body (m) and the air flow, a mixture of air and fuel containing particulate fuel is introduced into the gasification chamber (2b). Before combustion, the fuel is ignited by the ignition device (2c) while containing the particulate fuel, and becomes a flame at the combustion port (2). During combustion, the particulate fuel is completely gasified by the heat transfer of the flame of the combustion port (2) in the gasification chamber (2b), and becomes a flame at the combustion port (2).

The air and fuel supply system to the combustion port (4) will be described. The air in the wind box (8b) is finely adjusted to an appropriate amount by the air flow adjusting device (4a) and guided to the swirl chamber (4b) to be swirled. On the other hand, when the fuel vaporization mechanism (3) is sucked up from the fuel storage tank (i) by the fuel supply mechanism (d) having the fuel oil feeding adjustment function and the heating vaporization mechanism (3) reaches the vaporization temperature of the fuel, the fuel is supplied. In the heating vaporization mechanism, it is heated by the heat transfer of the flame of the combustion opening (2) before the ignition of the combustion opening (4) and by the heat transfer of the flame of the combustion opening (2) and the combustion opening (4) after the ignition. The vaporized gas of the fuel flows out from the air supply port (n), is mixed with the swirling air flow to become a mixture of air and fuel containing particulate fuel, and is introduced into the gasification chamber (4c). Gasification chamber (4
In c), the particulate fuel is produced by the heat transfer of the flame of the combustion opening (2) before the ignition of the combustion opening (4) and by the heat transfer of the flame of the combustion opening (2) and the combustion opening (4) after the ignition. Is completely gasified and becomes a flame at the combustion port (4).

The secondary air supply system will be described. The air in the wind box (8b) is finely adjusted to an appropriate amount by the air flow adjusting device (c) and then introduced into the secondary air flow chamber (8d). This air is a secondary air hole (8e) perforated in the flame holding plate (4d) and a secondary air flow pipe (8f) gently narrowed from the outside of the flame holding plate to the combustion chamber side installed in the upper part. Acts on the secondary and tertiary flames of the combustion port (2) and the combustion port (4) to promote good combustion.

The bottom of the secondary air flow chamber (8d) is removed and the supply of the air flow from the wind box (8b) is stopped, and the supply of the secondary air is supplied to each supply pipe by the heat pump action by the heat of the flame. Good. Also, the air flow adjusting devices (2a), (4a)
It is also possible to remove the fine adjustment functions of (8a) and (8a) and fine adjust the air amount of the combustion port (2) and the combustion port (4) only by fine adjustment of the air flow rate adjusting device (8c). In this case, when the bottom of the secondary air flow chamber (8d) is removed, the supply of secondary air is combined with the heat pump action. They are,
This is an application example of this embodiment, which is a problem to be considered mainly in terms of cost when designing a combustor.

In the following, problems, design ideas and solutions to be taken into consideration in carrying out this embodiment will be shown.

As a problem during combustion, there is a problem due to an insufficient air-fuel ratio. A premixed combustion burner generally used for a fan heater or the like employs a partial premixed flame burner from the viewpoint of flame lift and extinction and combustion noise. When this air-fuel ratio is large, combustion noise becomes relatively large, and NOx and the like increase. If it is small, combustion noise tends to be small, and NOx and the like tend to be reduced. However, if the air-fuel ratio is made small, the diffusion flame portion becomes large and CO etc. increases. As a measure against this,
By curving the upper part of the secondary air pipe and blowing the secondary air so as to cover the secondary flame and the tertiary flame, toxic components such as CO are burned. Moreover, such a device is also important for safety.

As a problem in combustion throttling, a fuel vaporizer of the type that heats a porous body tends to have relatively poor responsiveness to a sudden change in the fuel vaporization amount. The heat capacity of the fuel vaporizer (1) is made as small as possible to improve the responsiveness, and the responsiveness of the heating vaporization mechanism of the combustion port (4) is improved while improving the responsiveness by devising the heater increase / decrease timing. Since this is good, this flame assists the flame at the combustion port (2).

As a problem in extinguishing a fire, let us consider the mechanism of generation of unburned gas when extinguishing a flame which is in a partially premixed combustion with a constant air flow. Assuming that the fuel gas supply is momentarily stopped and the premixed gas flow is not greatly disturbed, and is being supplied to the combustion section in a laminar state, the premixed gas will be partially separated by the air flow coming from behind. Turbulence occurs, but it is carried to the combustion port with the proper air-fuel ratio and burned, and the fire is extinguished instantaneously. In this case, it is considered that almost no unburned gas is generated. But,
Here, when the premixed gas is greatly disturbed, the premixed gas and the air flow coming from behind are mixed, the air-fuel ratio of the end portion is largely changed, and an excessive part of the air-fuel ratio is generated. Extinguishing in this case, the excess air ratio rapidly increases, extinguishing fire,
After that, unburned gas is generated. Therefore, in order to suppress the malodor caused by the generation of such unburned gas in the combustion mode, the operation of interrupting the supply of the fuel gas is accelerated, the disturbance of the premixed gas is reduced, and the unpleasant odor is the unburned gas. Since it is generated by touching a high temperature part, it is necessary to take it out of the combustor as soon as possible. On the other hand, when an unburned gas or a gas containing a malodorous component and having a large excess air ratio is brought into contact with another flame, most of the components are burned depending on the manner of contact.

The operational effects of this embodiment will be described below.

The basic operation of the ignition mechanism will be described. The unburned gas cutoff device (9) is opened by the electric power, the residual fuel and the like are vaporized by the fuel vaporizer (1), and the fuel gas is filled around the vaporizer. In this state, when the air flow is guided from the air supply mechanism to the fuel vaporizer (1), a rich mixture state occurs for a short time. This phenomenon is caused by the premixing pipe and the gasification chamber (2b).
It compensates for the excessive phenomenon of air fuel consumption due to condensation on the tube wall caused by the fact that it is cold, and supplies a slightly rich air-fuel mixture to the combustion port (2) at the time of ignition. The flame kernel created by the igniter rapidly grows and ignites. Ignition is completed as it propagates to other flame outlets one after another. After power input, it can be set to a few seconds until ignition is completed. Further, a collar (2d) is provided above the combustion port to promote stable ignition. The diameter of the combustion port (2) is set as small as possible so that the propagation of the flame is completed promptly. These suppress the generation of unburned gas at the combustion port (2) during ignition. By this combustion, the heating vaporization mechanism (3) is preheated, and when the temperature reaches an appropriate temperature, the fuel is supplied from the fuel supply mechanism and the combustion of the combustion port (4) starts. During this time, depending on the design conditions, depending on the design, it can be set to about a few seconds.
The ignition of the combustion port (4) is stable because it is generated by the flame of the combustion port (2). The amount of combustion of the combustion port (2) at the time of ignition is performed by the maximum combustion of the combustion port (2). At the same time, the ignition of the combustion port (4) is also ignited by maximum combustion. This is because the residual heat of the heating vaporization mechanism (3) is carried out in a short time and the rise of room temperature is accelerated. Even if it is performed in this manner, the residual heat to the combustor is completed by the action of the combustion port (2), and the combustion port (4) is stably ignited by the flame of the combustion port (2). Because they have the source. Regarding the air flow supplied from the air supply mechanism to the combustion port (2) and the combustion port (4), in the present embodiment, the same air supply mechanism is used, but different air supply mechanisms are used. It may be supply. A wick may be used to supply the fuel to the fuel vaporizer (1).

Explaining the action during combustion, the combustion port (2)
In the system of No. 2, the air-fuel mixture created by the fuel vaporizer (1) is guided to the gasification chamber (2b). Since it contains particulate fuel and the like, it is blown onto the hot plate of the gasification chamber to become a complete premixed gas, which is ejected from the combustion port (2) and burned. Regarding the system of the combustion port (4), the fuel supplied from the fuel supply mechanism is almost instantaneously vaporized by the heating vaporization mechanism (3) and ejected from the air supply port (n). The air flow sent from the air supply mechanism becomes a swirl flow in the swirl chamber, and is uniformly mixed with the fuel gas in the process of being guided to the gasification chamber from the discharge port provided in the upper part of the swirl chamber. Since this air-fuel mixture also comes into contact with the cold air flow, it partially condenses and contains particulate fuel. This air-fuel mixture is blown onto the hot plate on the upper wall of the gasification chamber to become a complete premixed gas, which is ejected from the combustion port (4) and burned. For the single combustion of the combustion port (2), the air flow of the combustion port (4) acts as secondary air. The flame holding plate (4d) installed outside the combustion port is installed for the purpose of promoting mixing of unburned gas in the combustion port (4) described later with the combustion port (2).

The operation of the combustion amount restriction will be described. The maximum combustion of the combustion port (4) was designed to be 2000 kcal, the minimum combustion was 1000 kcal, the maximum combustion of the combustion port (2) was 1000 kcal, and the minimum combustion was 500 kcal by operating the air supply mechanism and the fuel supply mechanism or the heating mechanism. Then, the maximum combustion amount of this combustor is 3000 kc
It is al. 1500 kcal with minimal combustion of the combustion port (2) and combustion port (4). The minimum combustion is 500 kcal due to the single minimum combustion of the combustion port (2).
The maximum combustion and minimum combustion throttling ratio is 6: 1.

The unburned gas accompanying the extinction of the combustion port (4) when the combustion state of the combustion port (4) and the combustion port (2) is switched to the independent operation of the combustion port (2) is the combustion port (2). Combustion is performed by the flame of the combustion port (2) by the action of the flange (2d) and the flame holding plate (4d) set on the upper part of the. Further, from the independent operation of the combustion port (2), the ignition of the combustion port (4) is favorably performed by the flame of the combustion port (2) as described above.

The operation of extinguishing a fire will be described. During normal fire extinguishing, the flame of the combustion port (2) is not extinguished when the combustion port (4) is extinguished. This is because the fuel in the heating vaporization mechanism (3) evaporates and vaporizes almost instantaneously, but the air supply pipe (i)
Some unburned gas is generated because the gas is not closed. This is for burning this with the flame of the combustion port (2). This time is approximately a few seconds. In an emergency, extinguish the fire at the same time. Also, for the fuel supply pipe that is being supplied to the heating vaporization mechanism, if you do not use a fuel supply mechanism that does not lower the hydraulic head pressure and the oil level inside the supply pipe when the supply is stopped In order to prevent the fuel oil from being blown into the heating vaporization mechanism (3) by heating the oil supply pipe, a fuel escape device (10) shown in FIG. 14 is installed.

Next, as for the method of extinguishing the combustion port (2),
At the same time when the power of the heating mechanism (c) is turned off, the unburned gas cutoff device (9) is actuated and the fuel supply is momentarily stopped. Since there is no significant turbulence in the premix flow, there is little fluctuation in air fuel consumption at the end. In addition, it quickly flows out of the combustor, and about 1/3 to 6 for maximum combustion.
Since the combustion scale is one-half, the generation of offensive odor due to unburned gas is minimal.

The operation of the secondary air flow system will be described. The premixture in this embodiment has combustion stability, combustion noise, and NO.
x Considering countermeasures, etc., the air-fuel ratio is adjusted so as to achieve an appropriate partial premixed combustion. Therefore, if an appropriate amount of secondary air is not introduced, incomplete combustion will occur. The secondary air may be introduced by a heat pump action, but in the present embodiment, in order to realize a more reliable action, it is supplied from the air supply mechanism. The secondary air port perforated in the flame holding plate (4d) is for promoting combustion of the secondary flame and adjusting the combustion temperature, but may be unnecessary in design. The secondary air port, which is gently curved inside the combustor at the top, promotes the mixing of air into the secondary and tertiary flames, and wraps the entire flame in a dome shape to prevent fluctuations of the flame. There is. However, too large a secondary air amount causes a decrease in combustion temperature, so the design must be NO under various conceivable conditions.
It is necessary to carefully determine while measuring x, CO, and malodorous components.

FIG. 10 shows an example in which the heating vaporization mechanism (3) is installed above the gasification chamber (4c).

FIG. 11 shows an example in which the heating vaporization mechanism (3) is installed above the gasification chamber (2b).

FIG. 12 shows an example of the structure of the fuel escape device (10). In the middle of the fuel supply pipe, there is a slightly wide portion where the fuel supply pipe and the escape oil pipe (10a) are connected as shown in the figure. A valve body (1
0b) is contained, and the material is preferably a sealing material which is equal to or lighter than the specific gravity of the fuel oil or is covered with a sealing material. With respect to the fuel supply, the fuel is floated up by the supply pressure to close the escape oil pipe (10a), and the fuel is supplied to the fuel supply pipe through the gap. When the fuel supply is stopped, the residual oil remaining inside the fuel supply pipe lowers the valve body (10b) to open the escape oil pipe (10a), and the fuel in the fuel supply pipe passes through the escape oil pipe (10a) to store fuel. It is returned to the tank (l).

FIG. 13 shows an example of the unburned gas shutoff device (9). It is used when the unburned gas at the combustion port (2) is a problem for the embodiment of the present invention. Combustion mouth (2)
When the combustion condition is such that the prevention of the unburned gas is not considered, it may not be used.

The structure will be briefly described. It is composed of a magnetized driving body (9a), a guide (9b) for guiding the driving body, and a coil (9c), and the driving body is formed by the forward and reverse flow of the current of the coil (9c). By moving (9a) along the guide (9b), the outlets for the particulate fuel and vaporized gas of the fuel vaporizer (1) are opened and closed.

FIG. 14 shows an example of the structure of the fuel vaporizer (1), which has the same structure as the first embodiment of Japanese Patent Application No. 220243/1992.

To briefly explain the structure, the fuel is supplied from the fuel supply mechanism (a) to the heat resistant porous body (m) to form a fuel thin film, and the heat mechanism (c) is used to form the heat resistant porous body (m).
The premixed fuel is prepared by the air flow supplied from the air supply mechanism (b) with the particulate fuel and vaporized gas generated by blowing off the fuel thin film by the vapor pressure when the fuel in the hole is evaporated to vaporize the fuel in the hole.

[0048]

The first effect of the present invention is that a burner with a large amount of heat can be realized with a small starting power. The second effect is that a large combustion throttle ratio can be obtained.

A third effect is that the two-stage heating system can shorten the remaining heat time.

The effects of setting the secondary air flow pipe in FIG. 3 are as follows. 1. Since air is supplied to the secondary flame and the tertiary flame of the combustion flame, the secondary flame and the like can be reduced. 2. Even if CO is generated due to an insufficient amount of air passing through the fuel vaporizer (1) side for some reason, air is supplied into the secondary flame by the air flow supplied by the secondary air flow pipe (e). Therefore, the generation of toxic CO can be suppressed. 3. The outside of the combustor, including the secondary air flow tube, is safe because it does not get hot.

As for the effect of suppressing unburned gas, two burners mutually suppress the generation of unburned gas, so that when used as a burner for a fan heater or the like, it is possible to provide a combustion system with little foul odor when extinguishing a fire.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a usage state of a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a heating vaporization mechanism (3) installed horizontally.

FIG. 3 is an explanatory diagram of a usage state of the second embodiment of the present invention.

FIG. 4 is a sectional view of a heating vaporization mechanism (3) installed vertically.

FIG. 5 is a sectional view showing an example of a structure of a heating vaporization mechanism (3).

FIG. 6 is a cross-sectional view showing an example of a structure of a heating vaporization mechanism (3).

FIG. 7 is an explanatory diagram showing a third embodiment of the present invention.

FIG. 8 is an explanatory diagram showing a part of the fourth embodiment of the present invention.

FIG. 9 is an explanatory diagram showing a fifth embodiment of the present invention.

FIG. 10 is a cross-sectional view of an example in which the heating vaporization mechanism (3) is installed above the gasification chamber (4c).

FIG. 11 is a cross-sectional view of an example in which the heating vaporization mechanism (3) is installed above the gasification chamber (2b).

FIG. 12 is a cross-sectional view showing an example of the structure of a fuel escape device (10).

FIG. 13 is a cross-sectional view showing an example of the structure of an unburned gas cutoff device (9).

FIG. 14 is a sectional view showing an example of a structure of a fuel vaporizer (1).

[Explanation of symbols]

 1 Fuel Vaporizer 2 Combustion Port 3 Heating Vaporization Mechanism 4 Combustion Port 5 Stationary Blade 6 Stationary Blade 7 Air Supply Pipe 8 Air Supply Mechanism 9 Unburned Gas Cutoff Device 10 Fuel Relief Device a Fuel Supply Mechanism b Air Supply Mechanism c Heating Mechanism d Fuel supply mechanism e Oil feed pipe f Vaporization chamber g Oil stop plate h Secondary air flow pipe i Air feed pipe j Air feed pipe k Open / close valve l Fuel storage tank m Heat resistant porous body n Air feed port 2a Air flow regulator 2b Gasification Chamber 2c Ignition device 2d Tsuba 4a Air flow adjusting device 4b Swirling chamber 4c Gasification chamber 4d Flame holding plate 8a Air flow adjusting device 8b Wind box 8c Air flow rate adjusting device 8d Secondary air flow chamber 8e Secondary air hole 8f Secondary air Flow pipe 9a Drive body 9b Guide 9c Coil 10a Relief oil pipe 10b Valve body

Claims (13)

[Claims] 1. A heating vaporization mechanism for vaporizing fuel in a liquid fuel combustion system in which liquid fuel is vaporized by heating and premixed with an air flow to burn the fuel, and the first stage combustion is performed by heating the heating mechanism (c). ) And a heat-resistant porous body (m) attached to the fuel supply mechanism (a)
More fuel is supplied to the heat-resistant porous body (m), the heat-resistant porous body (m) is heated by the heating mechanism (c), and the premixed fuel is supplied with the air flow supplied from the air supply mechanism (b). The pre-mixed fuel is made by the fuel vaporizer (1), and the second stage of combustion is heated by the heat transfer of this flame, and the vaporization mechanism (3) is heated. Then, the fuel supplied from the fuel supply mechanism (a) is vaporized, or the fuel supplied from the other fuel supply mechanism (d) is vaporized and supplied from the air supply mechanism (b) or the other air supply mechanism. It is pre-mixed with the air to be fed and sent to the combustion port (4) for combustion, and after the flame of the combustion port (4) is established, the heating of the heating vaporization mechanism (3) is conducted to the combustion port (2) and the combustion. Liquid fuel combustor characterized by being conducted by heat transfer from a flame of a mouth (4) 2. The combustor according to claim 1, wherein a secondary air flow pipe (h) supplied from the air supply mechanism (b) is installed. 3. The combustor according to claim 1, wherein one or more air supply pipes (i) or air supply ports (n) are installed as a structure of the heating vaporization mechanism (3). 4. The combustor according to claim 1, wherein an air supply pipe provided with an on-off valve (k) is installed as a structure of the heating vaporization mechanism (3). 5. The combustor according to claim 1, wherein the air flow supplied from the air supply mechanism to the combustion port (4) is converted into a swirl flow by the stationary vanes (5). 6. The combustor according to claim 1, wherein an air flow is introduced from the side as a method of creating a swirling flow in the air supply method for the combustion port (4). 7. The combustor according to claim 1, wherein gasification chambers (2b) and (4c) are installed at the combustion port (2) and the combustion port (4). 8. The combustor according to claim 1, wherein a flange (2d) is installed above the combustion port (2). 9. The method according to claim 1, wherein the tip of the secondary air flow pipe supplied to the combustion flame is narrowed to the combustion flame side.
Combustor described 10. The combustion according to claim 1, wherein a part of the air flow supplied from the air supply mechanism is supplied to the heat pump pipe in a system in which the secondary air is supplied to the combustion flame by the heat pump pipe. Machine 11. The combustor according to claim 1, wherein an air flow swirl chamber is installed. 12. The combustor according to claim 1, wherein an unburned gas cutoff device (9) is installed as a fuel supply cutoff device for the combustion port (2). 13. The combustor according to claim 1, wherein a fuel relief device (10) is provided as a fuel supply cutoff device of the heating vaporization mechanism (3).