JP5211764B2 - Heating device - Google Patents

Description

  The present invention relates to a heating device that heats a fluid to be heated.

In restaurants, accommodation facilities, etc., there are cases where a small heating device for obtaining cooking steam or hot water for a bathroom is installed.
For example, Patent Document 1 discloses a heating device that heats water flowing in a pipe using high-temperature combustion gas generated by burning fuel together with combustion air, thereby obtaining steam.
Further, the heating device is used not only for generating steam and hot water but also for heating various fluids (heated fluid).
JP 2007-139358 A

By the way, in the conventional heating device, a large combustion chamber is required in order to ensure time for complete combustion in the combustion chamber. For this reason, a heating apparatus cannot fully be reduced in size.
Therefore, the flame is stably maintained even in a small combustion chamber by previously burning the unburned gas with the combustion gas and then burning it.
However, the combustion gas is quite hot. For this reason, there is a possibility that the unburned gas is excessively heated before being supplied to the combustion chamber, and the unburned gas is self-ignited or spreads, and burns outside the combustion chamber.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to reduce the size of a combustion chamber in a heating device that heats a fluid to be heated and stabilize a flame in the combustion chamber.

  In order to achieve the above object, according to the present invention, unburned gas including combustible fuel ejected through a nozzle hole set smaller than a flame extinguishing distance and at a flow rate capable of maintaining a flame is burned. A first flow path through which combustion gas from the combustion flows; and a second flow path formed around the first flow path and through which the unburned gas supplied through the nozzle holes flows. Features.

According to the present invention having such a feature, the unburned gas is heated by flowing through the second flow path formed around the first flow path through which the combustion gas flows.
Here, since the 2nd channel is formed around the 1st channel, the perimeter does not contact the 1st channel. Accordingly, a part of the heat transferred from the combustion gas is radiated from the unburned gas.

  Moreover, in this invention, the structure of providing the 3rd flow path through which a to-be-heated fluid flows is employ | adopted while being surrounded by the said 1st flow path.

  In the present invention, the third flow path is constituted by an internal space of a third pipe, and the first flow path is sandwiched between the third pipe and the first pipe that concentrically surrounds the third pipe. The second channel is composed of a space sandwiched between the first pipe and a second pipe concentrically surrounding the first pipe.

  Moreover, in this invention, the structure provided with the several fin projected from the outer peripheral surface of the said 3rd piping toward the said 1st flow path is employ | adopted.

  Moreover, in this invention, the said 3rd piping employ | adopts the structure bent at the said 1st flow path side and the said 2nd flow path side for every predetermined space | interval.

According to the present invention, since the second flow path through which the unburned gas flows is formed around the first flow path through which the combustion gas flows, the entire circumference of the second flow path is in contact with the first flow path. And a part of the heat transferred from the combustion gas is dissipated from the unburned gas.
For this reason, according to the present invention, it is possible to reduce the combustion chamber by heating the unburned gas, and suppress overheating of the unburned gas, thereby forming a stable flame in the combustion chamber. It becomes possible to do.
Therefore, according to the present invention, it is possible to reduce the size of the combustion chamber in the heating device that heats the fluid to be heated and stabilize the flame in the combustion chamber.

  Hereinafter, an embodiment of a heating device according to the present invention will be described with reference to the drawings. In the following description, a small boiler will be described as an example of the heating device according to the present invention. Further, in the following drawings, the scale of each member is appropriately changed in order to make each member a recognizable size.

(First embodiment)
1 to 3 are schematic configuration diagrams schematically showing the small boiler B1 of the present embodiment, FIG. 1 is a perspective view, FIG. 2 is a horizontal sectional view, and FIG. 3 is a vertical sectional view. is there.
As shown in these drawings, the small boiler B1 of the present embodiment includes a first pipe 1 (first pipe), a second pipe 2 (second pipe), and a third pipe 3 (third pipe). It has a triple tube structure arranged concentrically in plan view.

  The first pipe 1 is a pipe that extends in the vertical direction and has a lower end 11 that is a closed end, and has a nozzle hole whose diameter is set smaller than the extinguishing distance of unburned gas in the side wall near the lower end 11. A plurality of 12 are formed. And the 1st piping 1 is formed with the material (for example, brass (brass) etc.) with high heat conductivity.

  The second pipe 2 is a pipe extending in the vertical direction and concentrically surrounding the first pipe 1. The lower end 21 is a closed end, and is formed of a material having high heat transfer like the first pipe 1. ing.

  The third pipe 3 is a pipe that extends in the vertical direction and is inserted into the first pipe 1, and the lower end 31 is a closed end. In addition, it is preferable that this 3rd piping 3 is formed with a material with high heat conductivity similarly to the 1st piping 1 and the 2nd piping 2. FIG.

And the internal space of the 3rd piping 3 is made into the water flow path R3 (3rd flow path) through which water (to-be-heated fluid) W flows. That is, in the small boiler B <b> 1 of the present embodiment, the water flow path R <b> 3 is configured from the internal space of the third pipe 3.
A water supply part (not shown) for supplying water W to the water flow path R3 is connected near the lower end of the water flow path R3, and water W whose flow rate is adjusted by the water supply part is supplied to the water flow path R3. Is done. Further, a discharge part (not shown) for discharging steam generated by evaporation of the water W in the water flow path R3 is connected to the vicinity of the upper end of the water flow path R3, and the water flow path R3 is connected by the discharge part. The steam whose flow rate is adjusted is discharged to the outside.

In addition, in the space between the third pipe 3 and the first pipe 1, the combustion gas flow path R1 (the combustion gas G2 generated by the combustion of the unburned gas G1 and the unburned gas G1 flows). First flow path). That is, in the small boiler B1 of the present embodiment, the combustion gas flow path R1 is configured by a space sandwiched between the third pipe 3 and the first pipe 1 that concentrically surrounds the third pipe. The water channel R3 is surrounded by the combustion gas channel R1.
Note that the vicinity of the lower end of the combustion gas passage R1 (near the nozzle hole 12) is a combustion chamber K in which the unburned gas G1 ejected from the nozzle hole 12 burns. The combustion chamber K is provided with an ignition device (not shown).

A space between the first pipe 1 and the second pipe 2 serves as an unburned gas flow path R2 (second flow path) through which unburned gas G1 containing combustible fuel flows. That is, in the small boiler B1 of the present embodiment, the unburned gas flow path R2 is configured by a space sandwiched between the first pipe 1 and the second pipe 2 that concentrically surrounds the first pipe.
Note that the upper end of the second pipe 2 is connected to an unburned gas supply device (not shown) for supplying unburned gas G1 to the unburned gas flow path R2.

Further, as the unburned gas G1, an air-fuel mixture of fuel and oxidant can be used.
As the fuel, petroleum fuel, natural gas, or the like can be used.

  In the small boiler B1 of the present embodiment having such a configuration, first, unburned gas G1 is supplied from the unburned gas supply device connected to the second pipe 2 to the unburned gas flow path R2, and the first pipe 1 A flame is formed in the combustion chamber K by igniting and burning the unburned gas G1 ejected from the nozzle hole 12 formed in the above. The combustion gas G2 generated by burning the unburned gas G1 flows through the combustion gas flow path R1 and is discharged.

  When a flame is formed in the combustion chamber K in this manner, the high-temperature combustion gas G2 flows through the combustion gas flow path R1, so that the unburned gas G1 flowing through the unburned gas flow path R2 is heated. That is, the amount of heat of the combustion gas G2 is transferred to the unburned gas G1 through the first pipe 1 functioning as a heat exchange wall, and as a result, the unburned gas G1 is heated.

  The unburned gas G1 heated by heat exchange with the combustion gas G2 is jetted into the first pipe 1 through the nozzle hole 12 in a heated state. Then, the unburned gas G1 ejected from the nozzle hole 12 burns in the combustion chamber K.

And since the nozzle hole 12 formed in the 1st piping 1 is set smaller than the flame extinction distance in the combustion environment in the combustion chamber K of the unburned gas G1, a flame spreads to unburned gas flow path R2. It is suppressed.
Furthermore, since the unburned gas flow path R2 is formed around the combustion gas flow path R1, the entire circumference of the unburned gas flow path R2 does not come into contact with the combustion gas flow path R1, and the combustion gas G2 Part of the heat transferred is radiated from the unburned gas G1. For this reason, it is suppressed that unburned gas G1 is heated too much, a flame spreads to unburned gas flow path R2, and it is suppressed that unburned gas G1 self-ignites.
As a result, the flame is stabilized in the combustion chamber K, and combustion is continued.

  Further, as described above, the unburned gas G1 supplied to the combustion chamber K via the unburned gas flow path R2 flows through the combustion gas flow path R1 in a state where the combustion in the combustion chamber K is continued. Heated by the combustion gas G2. For this reason, even if the combustion chamber K is made extremely small as compared with the combustion chamber in the conventional heating device, a stable flame can be formed.

Thus, in a state where a flame is stably formed in the combustion chamber K and combustion is continued, the water W in the water channel R3 is the flame in the combustion chamber K and the combustion gas G2 in the combustion gas channel R2. Is evaporated by heating. That is, the heat generated by the combustion is transferred to the water W through the second pipe 2 functioning as a heat exchange wall, and as a result, the water W is heated and evaporated.
And the vapor | steam produced | generated by water W evaporating is discharged | emitted outside the small boiler B1 via the discharge part not shown.
Here, in the small boiler B2 of the present embodiment, the water flow path R3 is surrounded by the combustion gas flow path R1. The amount of heat can be transferred from the entire circumference of the water flow path R3 to the water W, and the water W can be efficiently heated.

According to the small boiler B1 of the present embodiment as described above, the unburned gas passage R2 through which the unburned gas G1 flows is formed around the combustion gas passage R1 through which the combustion gas G2 flows. The entire circumference of the gas flow path R2 is not in contact with the unburned gas flow path R1, and a part of the heat transferred from the combustion gas G2 is radiated from the unburned gas G1.
For this reason, according to the small boiler B1 of the present embodiment, the combustion chamber K can be reduced by heating the unburned gas G1, and the unburned gas G1 is prevented from being overheated. It becomes possible to stabilize the flame in the combustion chamber K.
Therefore, the combustion chamber K can be made smaller and the flame in the combustion chamber K can be stabilized.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the description of the second embodiment, the description of the same parts as those of the first embodiment will be omitted or simplified.

FIG. 4 is a schematic configuration diagram schematically showing the small boiler B2 of the present embodiment, and is a vertical sectional view.
As shown in this figure, the small boiler B2 of the present embodiment includes a fourth pipe 4 surrounding the second pipe 2 concentrically. A space sandwiched between the second pipe 2 and the fourth pipe 4 is configured as a storage unit 5 that is connected to the water flow path R3 and stores water W.

According to the small boiler B2 of the present embodiment having such a configuration, the water W once stored in the storage unit 5 is supplied to the water flow path R3, but the water W is supplied from the unburned gas G1 in the storage unit 5. Receive a portion of the heat released.
For this reason, the quantity of heat radiated from the unburned gas G1 can be used for heating the water W, and the water W can be heated more efficiently.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In the description of the third embodiment, the description of the same parts as those of the first embodiment will be omitted or simplified.

FIG. 5 is a schematic configuration diagram of the small boiler B3 of the present embodiment, and is a horizontal sectional view.
As shown in the figure, the small boiler B3 of the present embodiment includes a plurality of fins 10 protruding from the outer peripheral surface of the third pipe 3 toward the combustion gas flow path R1. The fins 10 are integrally formed with the third pipe 3 and are formed of a material having high heat transfer properties as with the third pipe 3.

  According to the small boiler B3 of the present embodiment having such a configuration, the fin 10 increases the heat exchange area between the combustion gas G2 flowing through the combustion gas flow path R1 and the water W flowing through the water flow path R3, and is more efficient. Thus, it becomes possible to heat the water W.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. In the description of the fourth embodiment, the description of the same parts as those of the first embodiment will be omitted or simplified.

FIG. 7 is a schematic configuration diagram of a small boiler B4 of the present embodiment, and is a horizontal sectional view.
As shown in this figure, in the small boiler B4 of the present embodiment, the second pipe 2 is bent into a star shape at a predetermined interval between the combustion gas flow path R1 side and the water flow path R3 side.

  According to the small boiler B4 of the present embodiment having such a configuration, the third pipe 3 is bent at a predetermined interval to form a star shape, so that the combustion gas G2 and the water flow path flowing through the combustion gas flow path R1. The heat exchange area with the water W flowing through R3 increases, and the water W can be heated more efficiently.

  As mentioned above, although preferred embodiment of the heating apparatus which concerns on this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

For example, in the said embodiment, the small boiler was mentioned and demonstrated as an example of a heating apparatus.
However, the present invention is not limited to this, and can be applied to a water heater that heats water to form hot water, an apparatus that heats oil or gas, and the like. It can also be applied to industrial products such as large boilers and fluidized bed boilers that use heated powder fluid.
In addition, when the heating device of the present invention is applied to a circulating fluidized bed boiler, the powdered fluid can be transported using combustion gas.

  Moreover, the external shape and cross-sectional shape of the 1st piping 1, the 2nd piping 2, the 3rd piping 3, and the 4th piping 4 in the said 1st-4th embodiment are examples, and can be set arbitrarily.

It is a perspective view showing a typical schematic structure of a small boiler in a 1st embodiment of the present invention. It is a horizontal sectional view showing a typical schematic structure of a small boiler in a 1st embodiment of the present invention. 1 is a vertical sectional view showing a schematic schematic configuration of a small boiler according to a first embodiment of the present invention. It is a vertical sectional view showing a schematic schematic configuration of a small boiler in a second embodiment of the present invention. It is a horizontal sectional view showing a typical schematic structure of a small boiler in a 3rd embodiment of the present invention. It is a horizontal sectional view showing a typical schematic structure of a small boiler in a 4th embodiment of the present invention.

Explanation of symbols

  B1, B2, B3, B4 ... Small boiler (heating device), 1 ... 1st piping, 12 ... Nozzle hole, 2 ... 2nd piping, 3 ... 3rd piping, 4 ... 4th piping, R1... Combustion gas flow path (first flow path), R2... Unburned gas flow path (second flow path), R3... Water flow path (third flow path), G1. ... combustion gas, W ... water (heated fluid), K ... combustion chamber

Claims (1)

A first flow path through which unburned gas containing combustible fuel injected through a nozzle hole set smaller than the flame extinguishing distance and jetted at a flow rate capable of maintaining a flame is combusted and in which the combustion gas from the combustion flows. ,
A second channel formed around the first channel and through which the unburned gas supplied through the nozzle hole flows ;
A third channel surrounded by the first channel and through which the fluid to be heated flows;
A reservoir formed around the second flow path and connected to the third flow path;
With
The third flow path is constituted by an internal space of a third pipe;
The first flow path is composed of a space sandwiched between the third pipe and a first pipe concentrically surrounding the third pipe;
The second flow path is composed of a space sandwiched between the first pipe and a second pipe concentrically surrounding the first pipe;
The heating device, wherein the storage unit is configured by a space sandwiched between the second pipe and a fourth pipe that concentrically surrounds the second pipe .

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