JP3532646B2 - Steam generator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam generator,
In particular, the present invention relates to a steam generator that is effective for introducing steam to a home bathroom or the like and forming a hot and humid sauna atmosphere in the bathroom.

[0002]

2. Description of the Related Art In recent years, it has been common practice to introduce steam into a domestic bathroom or the like to form a hot and humid sauna atmosphere in the bathroom. Since the steam in this case has a sufficient effect as a sauna even at a relatively low temperature (less than 100 ° C), a small boiler is usually installed in the bathroom, and steam generated in the boiler is piped. The inside of the bathroom is formed into a sauna atmosphere by being guided into the bathroom via the.

However, even if the boiler is small, it is equipped with a plurality of devices such as a combustion device, a heating device, a ventilation device, a water supply device, a control device, etc., so that the structure is complicated and maintenance is troublesome. Since the device is expensive, it is expensive as a whole. In addition, it requires a large installation space and is not effective for general household use.

On the other hand, as a steam generator for solving the above-mentioned problems, there is already known one which generates steam by bringing hot water and air into direct contact with each other. Since this steam generator has a simple structure including a hot water supply device for supplying hot water and an air supply device for supplying air, it has high utility value for home use.

However, even such a steam generator is not so compact that it can be installed in a narrow space such as a corner of a bathroom for home use. Therefore, an installation space for the steam generator must be provided separately from the bathroom. Not
The whole becomes large.

The present invention solves the problems of the conventional ones described above, and has a simple structure and is easy to maintain, and is sufficient even in a narrow space such as a corner of a bathroom for home use. It is an object of the present invention to provide an inexpensive steam generator that can be installed in the.

[0007]

In order to solve the above-mentioned problems, the invention according to claim 1 has a substantially triangular prism-shaped gas-liquid contact portion inside and the above-mentioned lower end portion. Gas-liquid contact part
Inlet leading to the lower end, on the gas-liquid contact portion to the upper portion
A substantially triangular prism-shaped body having a air outlet communicating with the end portion, respectively, while being attached to an upper end portion of the main body, a spray nozzle to disperse the hot water from above into the gas-liquid contact portion or
A hot water supply member having a hot water dispersion part consisting of a shower head; and a book mounted on the upper end of the main body.
And an air supply member for forming a flow of air leading to the air outlet from the suction port into the body through the gas-liquid contact portion,
The height of the gas-liquid contact portion is equal to the cross-sectional area of the gas-liquid contact portion, etc.
Uses a means that is 3 times the diameter of a circle with a new area
I am doing . In addition, the invention according to claim 2 is described in claim 1.
In the steam generator, the gas-liquid contact portion adopts a means comprising a space portion. Furthermore, according to claim 3,
According to Ming, in the steam generating device according to claim 1, the gas-liquid contact portion employs a means comprising a filling member. Furthermore
The invention according to claim 4 relates to the steam generator according to claim 3.
In location, the filler member Raschig rings, Pall rings, Tellerette, employs a means consisting of a wire mesh or the like industrially well packing used. further,
The invention according to claim 5 provides the steam generator according to claim 3.
Here, the filling member employs a plate material such as a flat plate, a corrugated plate, a perforated plate, and an inclined plate. Further claims
The invention according to claim 6 is the steam generator according to claim 1.
And, the gas-liquid contact part adopts a means consisting of an air dispersion member.
I am doing . Furthermore, the invention according to claim 7 is the claim 6
In the mounted steam generator, the air dispersion member is a means such as a bubble cap tray and a perforated plate tray.
Has been adopted . Furthermore, the invention according to claim 8 is a claim
In the steam generator according to any one of Items 1 to 7 , a heating member is provided in the main body, and means for heating the air flowing inside the main body by the heating member is adopted.

[0008]

According to the present invention, by adopting the above-mentioned means, hot water is supplied to the gas-liquid contact portion inside the main body by the hot water supply member, and the gas-liquid contact portion is supplied from the suction port of the body by the air supply member. When a flow of air reaching the outlet through the air is formed, the hot water supplied to the gas-liquid contact section comes into contact with the air passing therethrough, and the air that has been heated and humidified is discharged from the outlet of the main body to the outside of the main body. It will be blown out. The gas-liquid contact portion may be composed of only the space portion, but if it is composed of a filling member such as Raschig ring, pole ring, terraret, wire mesh, etc., a large area wettable by hot water can be obtained. Furthermore, if the gas-liquid contact portion is composed of an air dispersion member composed of trays such as a bubble cap tray and a perforated plate tray, air can be finely dispersed in hot water. Further, by providing the hot water supply member with the hot water dispersion portion for dispersing the hot water, the hot water and the air can be efficiently brought into contact with each other. As the hot water dispersion unit, a pipe member having a plurality of fine holes, a spray nozzle, a shower head, or the like is preferable.

[0009]

Embodiments of the present invention shown in the drawings will be described below. 1 to 5 show an embodiment of a steam generator according to the present invention, FIG. 1 is a front view, FIG. 2 is a top view, FIG. 3 is a bottom view, FIG. 5 is a rear view.

That is, the steam generator shown in this embodiment is configured to generate steam by bringing hot water and air into direct contact with each other. Suction port 3a which has the gas-liquid contact part 6 and which communicates the inside and outside of the gas-liquid contact part 6 with the upper and lower ends.
A main body 1 having a substantially triangular prism shape and a main body 1
A hot water supply member 14 mounted on the main body 1 and supplying hot water to the gas-liquid contact portion 6, and an air supply member 13 mounted on the main body 1 and supplying air to the gas liquid contact portion 6. There is.

In the main body 1, a front opening of a back plate 2 having a substantially V-shaped cross section is closed by a flat front plate 3 to form a space in which the upper and lower ends open at the inner portion thereof. The upper and lower openings of this space are closed by a flat plate-shaped upper plate 4 and lower plate 5 to form a gas-liquid contact portion 6 for contacting hot water with air.

The gas-liquid contact portion 6 may be constituted only by a space having a substantially triangular prism shape, but a filling member 7 having a large surface area capable of being wetted by hot water inside the main body 1, for example, a Tashich ring, a pole ring, a terraret, It may be configured by providing a plate material such as a wire mesh or a flat plate, a corrugated plate, a perforated plate, a slanted plate, etc., and an air dispersion member (not shown) composed of a tray such as a bubble cap tray and a perforated plate tray inside the main body 1. )
May be provided.

The height of the gas-liquid contact portion 6 is set to be at least three times the diameter of a circle having an area equal to the cross-sectional area of the gas-liquid contact portion 6. As will be described later, in order to make the relative flow of hot water and air countercurrent (the flow with the largest propulsive force that causes heat transfer or mass transfer), and to exert the effect of countercurrent sufficiently. Forms the gas-liquid contact portion 6 vertically elongated,
This is because it has been experimentally determined that it is preferable that the height of the gas-liquid contact portion 6 is three times or more the diameter.

A suction port 3a is formed in a lower end portion of the front plate 3, and the lower end portion of the gas-liquid contact portion 6 is opened to the outside of the main body 1 through the suction port 3a, and the front portion An air outlet 3b is bored in the upper end of the face plate 3, and the upper end of the gas-liquid contact portion 6 is opened to the outside of the main body 1 through the air outlet 3b.

The rear plate 2, the front plate 3, the upper plate 4 and the lower plate 5 are made of a material having excellent rust resistance such as SUS or plastic, and are formed into a substantially triangular shape by welding or screwing. It is a column-shaped assembly.

A flat plate-shaped suction port cover 8 is attached to the suction port 3a of the front plate 3, and the suction port cover 8 has a plurality of holes 8a (5 mm in this embodiment). A hole) is bored, and the lower end of the gas-liquid contact portion 6 is opened to the outside of the main body 1 through this hole 8a.

A blower outlet cover 9 is attached to the blower outlet 3b of the front plate 3, and a plurality of cuts 9a are formed on the front side of the blower outlet cover 9.
The upper end of the gas-liquid contact portion 6 is opened to the outside of the main body 1 via a.

The outlet cover 9 is a lower cover 1 having a substantially U-shaped cross section at the opening of the outlet 3b of the front plate 3.
0 is mounted, and the lower cover 10 forms a space 12 on the outer side of the air outlet 3b, the upper space communicating with the upper end of the gas-liquid contact portion 6 having an opening, and the lower cover 10 has a box-like shape. The upper cover 11 is attached to close the upper opening of the space 12, and the plurality of cuts 9a are provided on the front side of the upper cover 11.

The plurality of cuts 9a are provided by providing a plurality of plate members on the front side of the upper cover 11 and forming cuts 9a extending horizontally between adjacent plate members.

Then, as described above, the suction port 3 of the front plate 3
By providing the suction port cover 8 to a and the blow port cover 9 to the blow port 3b of the front plate 3, a series of passages from the suction port 3a to the blow port 3b via the gas-liquid contact portion 6 is formed. Is formed, one end of this passage is opened to the outside through a plurality of holes 8a of the suction port cover 8, and
The other end of the passage is opened to the outside through a space 12 inside the outlet cover 9 and a plurality of cuts 9a in the upper cover 11.

A fan 13, which is an air supply member, is mounted on the upper cover 11 of the outlet cover 9. The fan 13 is a motor unit 1 mounted on the upper cover 11.
3a and a fan portion 13b connected to the motor portion 13a and located in the space 12 inside the upper cover 11
And the fan unit 13 by operating the motor unit 13a.
By rotating b, it is possible to form a flow of air from the suction port 3a through the gas-liquid contact portion 6 to the outlet port 3b. In this example, the fan 13 having an output of 28 W was used.

The fan 13 is a sirocco fan,
Although an axial fan or the like is effective, the invention is not limited to this, and may be any one having a function of circulating air from the suction port 3a to the air outlet 3b through the gas-liquid contact portion 6. is there.

The hot water supply member 14 is attached to the top plate 4 and a hot water dispersion portion 15 for dispersing hot water in the gas-liquid contact portion 6, and is attached to the upper cover 11 and the heat A flow rate adjusting valve 16 for adjusting the flow rate of hot water supplied to the water dispersing section 15, a flow rate adjusting valve 16, and the hot water dispersing section 1
5 and a solenoid valve 17 that is provided between the flow rate adjusting valve 16 and the hot water supply unit 15 to turn hot water supply to 0N-OFF. The hot water dispersion unit 15
When the gas-liquid contact portion 6 is composed only of a space portion, a strong one is required, and the gas-liquid contact portion 6 is filled with the filling member 7.
However, when the gas-liquid contact portion 6 is formed of an air dispersion member, it is not necessary. Therefore, an appropriate combination may be selected according to the application.

A rubber hose 18 is connected between the electromagnetic valve 17 and the hot water dispersion portion 15, and a rubber hose 1 is inserted through the inside of the main body 1 into the flow rate adjusting valve 16.
One end of the rubber hose 19 is connected, and the other end of the rubber hose 19 is connected to the hot water supply pipe connection port 20 mounted on the lower surface plate 5.

One end of a rubber hose (not shown) for hot water supply is connected to the hot water supply pipe connection port 20, and the other end of this rubber hose is inserted through an outlet 2a of a back plate 2 described later and is not shown. It is designed to be connected to a hot water supply source.

A hot water discharge pipe connection port 21 is attached to the lower surface plate 5, and one end of a rubber hose (not shown) for hot water discharge is connected to the hot water discharge pipe connection port 21. The end is inserted through an outlet 2a of a back plate 2 to be described later and drawn out of the main body 1, and the hot water and the like accumulated inside the main body 1 is discharged to the outside through the rubber hose for discharging hot water.

A pair of outlets 2b, 2b for taking out a cord (not shown) for wiring are provided at the upper end of the back plate 2, and the solenoid valve 17 for the solenoid valve 17 is provided through the outlets 2b, 2b. A wiring cord (not shown), a wiring cord for the fan 13 (not shown) and the like are pulled out of the main body 1.

At the lower end of the back plate 2, an outlet 2a for drawing out a rubber hose (not shown) for supplying and discharging hot water,
A pair of holes 2a are provided, and a rubber hose for supplying hot water and a rubber hose for discharging hot water are drawn out of the main body 1 through the outlets 2a, 2a.

The hot water dispersion unit 15 is a shower head,
A spray nozzle, a tube provided with a plurality of fine holes (shower head in this embodiment), and the like, are not limited to this, and have a function of dispersing hot water in the gas-liquid contact portion 6. Anything that has

A heater 22, which is a heating member, is installed in the space 12 inside the outlet cover 9 so that the air passing through the space 12 can be heated by the operation of the heater 22. Has become. Although a ceramic heater (output 800 W) is used as the heating member 22 in this embodiment, the heating member 22 is not limited to this and may have any similar function.

Next, the operation of the above will be described. First, when the steam generator configured as described above is installed in a corner of a home bathroom or the like and hot water is supplied to the hot water supply member 14 from a hot water supply source (not shown), hot water is supplied to the hot water. From the pipe connection port 20 to the flow rate adjusting valve 16 via the rubber hose 19, hot water according to the opening / closing degree of the flow rate adjusting valve 16 is supplied to the hot water dispersion unit 15 via the electromagnetic valve 17, and this hot water is From the hot water dispersion part 15 to the gas-liquid contact part 6 inside the main body 1
Dispersed in.

When a voltage is applied to the motor portion 13a of the fan 13 which is an air supply member to rotate the fan portion 13b, the air in the bathroom is formed inside the main body 1 from the suction port 3a of the main body 1. It is sucked into the gas-liquid contact portion 6, passes through it, and is blown out of the body 1 through the air outlet 3b of the body 1. That is, from the suction port 3a of the main body 1 to the gas-liquid contact portion 6
A flow of air (flow of air from the lower side to the upper side) reaching the outlet 3b via is formed.

As described above, the hot water supply member 14 supplies the hot water to the gas-liquid contact portion 6, and the air supply member 13
From the suction port 3a through the gas-liquid contact portion 6 to the blow-out port 3
By forming an air flow to b, the air passing therethrough is dispersed in the hot water flowing down the gas-liquid contact portion 6,
Both of them come into contact with each other to raise the temperature and humidity of the air, and the air is blown out of the main body 1 through the air outlet 3b, so that the inside of the bathroom is formed into a hot and humid sauna atmosphere.

On the other hand, when the inside of the bathroom is used as a drying room, the supply of hot water to the gas-liquid contact portion 6 by the hot water supply member 14 is stopped and the space 12 inside the outlet cover 9 is closed. The mounted heater 22 is operated and the air supply member 13 is operated.

The air sucked from the suction port 3a of the main body 1 into the gas-liquid contact portion 6 inside the main body 1 by the operation of the air supply member 13 passes therethrough and from the blow-out port 3b of the main body 1 to the blow-out port cover 9 of the main body 1. It reaches the inner space 12 and is blown out of the main body 1 through a plurality of notches 9 a on the front surface side of the upper cover 11 through the inner space 12. In this case, since the heater 22 is installed in the space 12 inside the air outlet cover 9, the air blown from the air outlet 3b becomes hot dry air and is blown into the bathroom. The inside of the bathroom will be formed in a hot and dry atmosphere.

In this embodiment, the size of the bathroom is “1200 mm × 1800 mm × 2000 mm (height)”, the initial temperature of the bathroom is “21 ° C.”, the outside air temperature is “21 ° C.”, and hot water is supplied. The amount of hot water supplied by the member 14 is set to "5.0
The performance test was performed with the output of the fan 13 set to 28 W and the output of the heater 22 set to 800 W.

As a result, about 7
By supplying hot water of 5 ° C, relatively low temperature steam of 40 ° C to 50 ° C can be generated, and by filling such bathroom with 40 ° C to 50 ° C in the bathroom. The temperature could be (see FIG. 6).

On the other hand, when the supply of hot water was stopped and the fan 13 and the heater 22 were operated, the weight of the laundry before drying was 5.45 Kg and the weight before the test after drying for 5 hours. It became 3.40 Kg (see FIG. 7). The relationship between the hot air temperature, the indoor temperature, and the indoor humidity is shown in FIG. 8. The indoor temperature is in the range of 30 ° C. to 35 ° C., and the hot air temperature is in the range of 40 ° C. to 45 ° C. On the other hand, the indoor humidity gradually decreased with time, and the humidity was 75% at the start of drying and dropped to 35% at the end of drying.

The background of the present invention will be described below.
Generally, in a steam generator using hot water, the point is to bring the hot water and air into contact with each other efficiently in order to make the whole compact. However, the phenomenon that occurs when hot water and air are in contact with each other is complicated. Heating the air with hot water (heat transfer) and moving part of the hot water by evaporating (moving in air) ( Mass transfer) occurs at the same time.
Therefore, it is difficult to accurately grasp these phenomena, and it is difficult to clarify the factors that determine the performance of the device and the means for improving the efficiency.

In this case, it is clear that the performance of the apparatus is improved by increasing the contact area between hot water and air.
Therefore, various efforts have been made in the past to simply increase the contact area. However, increasing the contact area results in increasing the size of the device, which defeats the purpose of downsizing the device.

In a normal heat transfer device, the heat transfer coefficient is increased so as to increase the efficiency of the device. This corresponds to devising the flow of hot water and air in the steam generator to be as turbulent as possible to promote heat transfer and mass transfer. However, in the steam generator,
Since the hot water and the air are directly contacted with each other, the heat transfer is originally good, and it is not so effective to greatly improve the heat transfer.

Therefore, it is conceivable to increase the driving force that causes heat transfer or mass transfer. This means increasing the temperature difference in heat transfer, and increasing the temperature difference or pressure difference of the moving substance in mass transfer. However, in the steam generator, heat transfer and mass transfer proceed at the same time, so it was unclear what and how much it affects the performance of the device. Therefore, the inventor conducted an experimental study on the increase in propulsive force with the goal of efficiently contacting hot water and air to make the apparatus compact.

First, the propulsion force is the temperature difference between hot water and air when heat transfer is considered, and the moisture content between the hot water surface and air when mass transfer is considered. It becomes the pressure difference of. Therefore, in order to clarify which is the dominant factor, the amount of heat exchanged in the steam generator (that is, the amount of steam generated) is measured, and the relationship between the amount of heat exchanged and the temperature difference, and the amount of heat exchanged and the pressure difference I investigated the relationship in detail. As a result,
It has been found that the heat exchange amount of the steam generator is proportional to the difference between the vapor pressure of hot water and the partial pressure of moisture in the air, that is, the pressure difference.

Next, since the pressure difference, which is the propulsive force, changes depending on the structure of the device, that is, the relative flow of hot water and air, there is a problem how to configure the device. The relative flows of hot water and air include countercurrent, cocurrent,
There are cross currents and the like, and it is considered that the counter current is the most preferable from an engineering point of view, but the specific difference is not clear. Therefore,
As a result of a comparative examination of these, it became clear that in the case of countercurrent flow, it is about 1.5 times that of other flows.

Further, in order to evaluate the effect of the increase in the propulsive force due to the counterflow from the viewpoint of downsizing the steam generator, the effect of the propulsive force on the heat exchange amount (or the steam generation amount) and the hot water The effect of the contact area between air and air was studied in detail. As a result, it was found that the heat exchange amount (or steam generation amount) was proportional to the product of the propulsive force and the contact area.

Therefore, when the propulsive force is increased in a device having the same contact area, the amount of heat exchanged is increased in proportion to the propulsive force. On the other hand, when the contact area is simply increased, the amount of heat exchanged increases with an increase in the contact area, but at the same time, the propulsive force decreases with an increase in the amount heat exchanged, so the amount of heat exchange does not increase as expected. . Considering these together, it is suggested that if the propulsive force can be increased, the contact area can be significantly reduced.

As described above, the propulsive force in the case of counterflow is about 1.5 times that of other flows. As a result of research into how small the contact area can be made, the contact area is half that of the conventional one. It was found that the same performance was obtained even with the following, and the effect was smaller than expected in miniaturizing the device.

In order to make the relative flow of hot water and air countercurrent, the gas-liquid contact portion is elongated vertically so that hot water flows downward from above and air flows downward from above. Will be flushed. Then, it has been found that it is preferable to set the ratio of the height and the diameter of the gas-liquid contact portion to 3 times or more in order to actually sufficiently exert the effect of the countercurrent.

The cross section of the gas-liquid contact portion is not limited to a circular shape, but if it is not circular, it can be discussed with a circle having the same area as is often used in fluid dynamics. That is, it can be considered by the diameter (equivalent diameter) of a circle having an area equal to the cross-sectional area of the gas-liquid contact portion.

[0050]

[Effect of the Invention] The present invention, configured as described above, the gas
The height of the liquid contact part has an area equal to the cross-sectional area of the gas-liquid contact part.
By setting the diameter of the circle to be 3 times or more, the relative flow of hot water and air can be made countercurrent, and
The effect of countercurrent can be fully exerted. Therefore, even if the contact area between hot water and air is smaller than that of the conventional one, the performance higher than the conventional one can be obtained, and the overall size can be significantly reduced without lowering the performance. />-out that. In addition, the main body is formed into a substantially triangular prism shape and
By forming the gas-liquid contact part in the body in a substantially triangular prism shape,
It is possible to install it in a narrow space such as a corner of a bathroom for home use. In addition, it has a gas-liquid contact part inside, and the lower end is connected to the lower end of the gas-liquid contact part.
It has a suction inlet that connects to the upper end of the gas-liquid contact part.
Attached to the upper end of the main body
And has a dispersion part that disperses hot water from above in the gas-liquid contact part.
It is attached to the hot water supply member and the upper end of the main unit
Air from the suction port into the body through the gas-liquid contact section to the air outlet
Since it has a simple structure consisting of an air supply member that forms the flow of , the maintenance is easy and
It would also be possible to make the whole cheaper. Furthermore, the gas-liquid contact part is composed only of the space part with a filling member or an air dispersion member, and the hot water dispersion of them and the hot water supply member is performed.
Air can be efficiently dispersed in the hot water by appropriately combining the parts and the parts, and thus steam can be efficiently generated.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a steam generator according to the present invention.

FIG. 2 is a top view of what is shown in FIG.

FIG. 3 is a bottom view of what is shown in FIG.

FIG. 4 is a vertical sectional view of what is shown in FIG.

FIG. 5 is a rear view of what is shown in FIG.

6 is an explanatory diagram showing the results of the performance test of the one shown in FIG. 1, and is an explanatory diagram showing the relationship between hot water supply temperature, room temperature, steam temperature and time.

FIG. 7 is an explanatory diagram showing the results of the performance test of the one shown in FIG. 1, and is an explanatory diagram comparing the weight of the laundry before drying and the weight after drying.

8 is an explanatory diagram showing the relationship between hot air temperature, room temperature, room humidity, and time shown in FIG. 7. FIG.

[Explanation of symbols]

1 ... Main body 2 ... rear plate 2a, 2b ... Exit 3 ... Front plate 3a ... Suction port 3b ... Blowout port 4 ... Top plate 5: Bottom plate 6 ... Gas-liquid contact section 7 ... Filling material 8 ... Cover for suction port 8a ... hole 9 ... Cover for outlet 9a ... notch 10 ... Lower cover 11 ... Top cover 12 ... space 13 ... Air supply member (fan) 13a ... Motor part 13b ... Fan section 14: Hot water supply member 15: Hot water dispersion unit 16 ... Flow rate adjusting valve 17 ... Solenoid valve 18, 19 ... Rubber hose 20: Hot water supply pipe connection port 21 ... Hot water pipe connection port 22 ... Heating member (heater)

Claims (8)

(57) [Claims] With claim 1, having a substantially triangular prism shape of the gas-liquid contact portion therein, inlet communicating with a lower end portion of the gas-liquid contact portion to the lower end, the air outlet leading to the upper end of the gas-liquid contact portion to the upper portion
A substantially triangular prism-shaped body having a respective upper end of the body
From a spray nozzle or a shower head that is attached to the above-mentioned part and disperses hot water from above into the gas-liquid contact part.
A hot water supply member having a hot water distribution unit comprising, on the body
An air supply member that is attached to an end portion and that forms an air flow from the suction port to the air outlet through the gas-liquid contact portion in the main body, and the height of the gas-liquid contact portion is increased.
A circle having an area equal to the cross-sectional area of the gas-liquid contact portion.
A steam generator characterized by having a diameter of 3 times or more . 2. The steam generator according to claim 1, wherein the gas-liquid contact portion comprises a space portion. 3. The steam generator according to claim 1, wherein the gas-liquid contact portion is a filling member. 4. The steam generator according to claim 3, wherein the filling member is made of a filler that is often used industrially, such as a Raschig ring, a pole ring, a terraret, or a wire mesh. 5. The filling member is a flat plate, a corrugated plate, a perforated plate,
The steam generator according to claim 3, which is made of a plate material such as an inclined plate. 6. The steam generator according to claim 1, wherein the gas-liquid contact portion is an air dispersion member. 7. The steam generator according to claim 6, wherein the air dispersion member comprises a fence step such as a bubble cap tray or a perforated plate tray. 8. A heating member is provided on the main body, and the heating unit is provided.
To heat the air flowing inside the main body with a material
The steam generator according to any one of claims 1 to 7 .