JP7316669B2 - Thermal storage warm air heater - Google Patents

Description

Article 30, Paragraph 2 of the Patent Act applies Date of sale: August 26, 2020 Place of sale: Rankoshi Town Office

The present invention relates to a heat storage hot air heater.

Conventionally, stoves using solid fuel have been proposed. This burns solid fuel in the furnace and heats the indoor air with radiant heat from the furnace surface. Reference 1). Such radiant stoves are used to heat relatively small spaces.

On the other hand, a warm air heater using a heat exchanger has been proposed as a heating system used in a gardening house or the like having a larger space (see, for example, Patent Document 2). The hot air heater uses a fan to draw air into the combustion furnace, and discharges the combustion gas generated in the combustion furnace to the outside through the smoke pipe and chimney, while taking in the low-temperature house air into the casing. The air inside the house and the combustion gas are heat-exchanged through a smoke pipe, and warm air is blown into the house for heating. In addition, biomass solid fuel using wood chips, rice husks, etc. is being reconsidered as a fuel for hot air heaters.

Japanese Patent Application Laid-Open No. 2010-19470 JP 2018-96565 A

In order to lengthen the heating operation time of the hot air heater, it is possible to increase the size of the combustion furnace and burn more fuel, but in this case the overall size of the warm air heater is unavoidably increased. There was a problem. It is also conceivable to store heat energy from combustion in hot water and use the hot water as a heat source to extend the heating operation time. It was difficult to adopt it for the heating equipment provided.

SUMMARY OF THE INVENTION An object of the present invention is to provide a heat storage warm air heater capable of extending the heating operation time with a simple configuration.

A heat storage hot air heater according to the present invention includes a combustion furnace having a combustion chamber, and a blower for introducing air into the combustion furnace, the combustion chamber being a combustion part in which fuel is burned, a heat storage unit containing a large number of heat storage elements, the heat storage unit communicates with the combustion unit on the downstream side, a partition plate is disposed between the combustion unit and the heat storage unit, and the combustion furnace Part of the air introduced into the heat storage unit flows from the upstream side to the downstream side through the gaps between the numerous heat storage elements.

According to the heat storage warmer according to the present invention, since a large number of heat storage bodies are accommodated in the heat storage section of the combustion chamber, part of the heat energy generated by the combustion of the fuel is stored in the heat storage bodies and generated by the combustion. When the heat energy to be supplied decreases or combustion is completed, the heat storage medium serves as a heat source to continue the heating operation, so the heating operation time can be extended.

In addition, part of the air introduced into the combustion furnace flows through the gaps in the heat accumulators from the upstream side to the downstream side of the heat accumulator, promoting the release of the thermal energy stored in the heat accumulators. Furthermore, since the partition plate is interposed between the heat storage medium and the fuel, ash can be easily removed after combustion.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic which shows the thermal storage warm air heater which concerns on embodiment of this invention. FIG. 2 is an external perspective view showing an example of fuel used in the heat storage hot air heater of FIG. 1 ; III-III line sectional drawing of FIG. The IV-IV line cross-section perspective view of FIG. (a) is a diagram showing the heating function of a conventional warm air heater having no heat storage means, and (b) is a diagram showing the heating function of the heat storage warm air heater of FIG. The figure which shows the modification of the heat storage warm air heater which concerns on embodiment of this invention. The figure which shows the other modification of the thermal storage warm air heater which concerns on embodiment of this invention.

A heat storage warm air heater according to an embodiment of the present invention will be described with reference to the accompanying drawings. Referring to FIG. 1, a heat storage hot air heater 1 of the present embodiment is installed and used in a gardening house H, for example. 3 and a chimney 4 located downstream of the heat exchanger 3. The fuel furnace 2 in this embodiment is particularly a batch combustion furnace, and hollow cylindrical solid fuel made from biomass (such as rice husk) as shown in FIG. 2 is used as the fuel F, for example. Air in the gardening house H (hereinafter referred to as "outside air") is introduced into the combustion furnace 2 through an air supply pipe 5, and the fuel F is burned in the combustion furnace 2 to generate high-temperature combustion gas.

1 and 3 to 4, the combustion furnace 2 has a furnace body 22 having a combustion chamber 21 and a partition plate 23 erected inside the furnace body 22. As shown in FIG. The partition plate 23 is installed upstream of the combustion chamber 21 and defines a flow path 27 between itself and the rear wall 26 of the furnace body 22 . Also, the partition plate 23 is provided with a large number of through holes 23a. Outside air introduced into the combustion furnace 2 from the air supply pipe 5 passes through the flow path 27 and is supplied to the combustion chamber 21 via the through hole 23 a of the partition plate 23 . Note that the heat storage plate 11 and the heat storage body 10 are omitted in FIG.

The heat storage hot air heater 1 further has a heat storage means 15, and the heat storage means 15 is composed of a large number of heat storage bodies 10 spread over the bottom surface 23 of the combustion chamber 21 and partition plates placed on the heat storage bodies 10. and a heat storage plate 11 of The fuel F is placed on the heat storage plate 11 and burned there. That is, the combustion chamber 21 is divided into a combustion portion 21a in which the fuel F is burned by the heat storage plate 11 and a heat storage portion 21b that accommodates the heat storage body 10. , and the heat storage portion 21 b communicates with the combustion portion 21 a on the upstream side and the downstream side of the heat storage plate 11 .

As a result, part of the outside air supplied to the combustion chamber 21 through the through hole 23a of the partition plate 23 flows from the upstream side to the downstream side in the heat storage portion 21b along the heat storage plate 11, and flows into the combustion portion 21a. .

The heat storage element 10 is preferably made of ceramic, and spherical alumina (alumina ball) is used as the heat storage element 10 in this embodiment. Therefore, the air (outside air) passing through the heat storage section 21 b flows through the gaps between the large number of heat storage elements 10 . The heat storage plate 11 is preferably made of alumina ceramic (high alumina brick).

The heat exchanger 3 is connected to the combustion furnace 2 via a combustion gas pipe 6 , and combustion gas generated in the combustion furnace 2 is supplied to the heat exchanger 3 via the combustion gas pipe 6 . The heat exchanger 3 includes a casing 31 , a plurality of smoke pipes 32 provided inside the casing 31 , and a blower 33 provided at an upper opening of the casing 31 . Each smoke pipe 32 is connected to the combustion gas pipe 6, and the combustion gas supplied through the combustion gas pipe 6 is guided to the chimney 4 through the plurality of smoke pipes 32, and is exhausted from the chimney 4 to the outside of the gardening house H (outdoor). be done. The blower 33 takes outside air into the casing 31 by rotating a blower fan (not shown), and generates warm air by heat exchange with the combustion gas passing through the smoke pipe 32. The hot air flows into the gardening house H from the air outlet of the duct 34, and heating is performed.

The air supply pipe 5 and the chimney 4 are provided with blowers 7 and 8, respectively. The blowers 7 and 8 are electric axial flow blowers, and the operation of the blowers 7 and 8 promotes introduction of outside air into the combustion furnace 2 and exhaust of combustion gas through the chimney 4 . The hot air heater 1 further includes a vent pipe 9 branching from the combustion gas pipe 6 and extending to the outside of the gardening house H.

Heating by the heat storage warm air heater 1 having such a configuration is performed as follows. The fuel F is burned in the combustion furnace 2 while the outside air is introduced into the combustion furnace 2 by the blowers 7 and 8 . Accordingly, the combustion gas generated in the combustion furnace 2 is introduced into the smoke pipe 32 through the combustion gas pipe 6 by the blowers 7 and 8, and exhausted to the outside of the gardening house H through the chimney 4. The outside air taken into the casing 31 of the heat exchanger 3 by the blower 33 is warmed by heat exchange with the combustion gas passing through the smoke pipe 32, and sent into the gardening house H through the duct 34. .

Also, part of the thermal energy generated by the combustion of the fuel F is transmitted to the heat storage body 10 via the heat storage plate 11 and stored in the heat storage plate 11 and the heat storage body 10 (heat storage means 15).

After that, as the combustion of the fuel F progresses, surface combustion occurs in which the carbon of the fuel F is burned, and the amount of combustion gradually decreases. When the amount of combustion decreases in this way and the thermal energy obtained by combustion decreases, the thermal energy stored in the heat storage means 15 (that is, the heat storage plate 11 and the heat storage body 10) is gradually dissipated, and the heat storage means 15 becomes the heat source. function as Even after the combustion of the fuel F has stopped, heating can be performed for a while using only the heat storage means 15 as a heat source. Note that the rotational speeds of the fans 7 and 8 are controlled according to the amount of fuel F burned.

As described above, according to the heat storage hot air heater 1 according to the present embodiment, part of the thermal energy generated by the combustion of the fuel F is stored in the heat storage means 15 consisting of the heat storage plate 11 and the heat storage body 10, and the combustion is performed. Since the heat storage means 15 is used as a heat source after completion, the heating operation time of the heat storage hot air heater 1 can be lengthened.

FIG. 5 shows changes in hot air temperature passing through the duct 34 . It can be confirmed that, in the heat storage warm air heater 1 of the present embodiment, the heating peak temperature is lowered and the heating effect is constant compared to the conventional one that does not have the heat storage means 15 . This is because part of the thermal energy generated by the combustion of the fuel F is stored in the heat storage means 15 in the first half of the combustion, and when the thermal energy due to the combustion of the fuel F decreases in the second half of the combustion, the heat storage means 15 functions as a heat source. It's for.

Furthermore, in the present embodiment, since outside air flows between the heat storage bodies 10, the thermal energy stored in the heat storage bodies 10 is effectively released.

Since the fuel F is placed on the heat storage plate 11, compared with the case where the fuel F is placed directly on the bottom surface 23 (lower wall of the furnace body 22) of the combustion chamber 21 with low thermal conductivity, the fuel The temperature rise of F is accelerated, and the combustion of fuel F immediately after the start of combustion can be promoted.

Since the heat storage plate 11 is simply placed on the heat storage element 10, the overall configuration of the combustion furnace 2 can be simplified. Further, since the fuel F and the heat storage element 10 are separated by the heat storage plate 11, ash can be easily removed after the fuel F is burned.

As described above, the heat storage hot air heater according to the embodiment of the present invention has been described with reference to the accompanying drawings, but the present invention is not limited to such an embodiment, and various modifications and variations can be made without departing from the scope of the present invention. Modification is possible.

For example, in the above embodiment, the heat storage plate 11 is placed on the bottom surface 23 of the combustion chamber 21 and the heat storage plate 11 is placed on the bottom surface 23 of the combustion chamber 21 . Further, in the above embodiment, the heat storage portion 21b is provided between the combustion portion 21a and the bottom surface 23 of the combustion chamber 21, but the present invention is not limited to this. The heat storage plate 11 may be provided between the combustion portion 21a and the upper surface 24 of the combustion chamber 21, and the heat storage plate 11 may be covered with the heat storage plate 11. Alternatively, as shown in FIG. 21b may be provided between the combustion portion 21a and the side surface 25 of the combustion chamber 21, and the heat storage bodies 10 may be vertically stacked.

In the above embodiment, the heat storage plate 11 made of alumina ceramic is used as the partition plate, but it is also possible to use a partition plate that does not have a heat storage function. For example, a steel plate can be used as the partition plate. can.

1 heat storage hot air heater 2 combustion furnace 3 heat exchanger 4 chimney 6 combustion gas pipes 7, 8 fan 10 heat storage element 11 heat storage plate (partition plate)
15 heat storage means 21 combustion chamber 21a combustion section 21b heat storage section F fuel

Claims (5)

a combustion furnace having a combustion chamber ;
a blower for introducing air into the combustion furnace;
The combustion chamber has a combustion section in which fuel is burned, and a heat storage section containing a large number of heat storage bodies, and the heat storage section communicates with the combustion section on the downstream side,
A partition plate is arranged between the combustion section and the heat storage section,
A heat-storage hot-air heater in which part of the air introduced into the combustion furnace flows from the upstream side to the downstream side of the heat-storage unit through the gaps between the numerous heat-storage elements. 2. The heat storage hot air heater according to claim 1, wherein the plurality of heat accumulators are spread over the bottom surface of the combustion furnace, and the partition plate is placed on the plurality of heat accumulators. 3. The heat storage hot air heater according to claim 1, wherein each of the plurality of heat storage elements is a spherical ceramic heat storage element. The heat storage hot air heater according to any one of claims 1 to 3, wherein the partition plate is made of alumina ceramics. The combustion furnace has a furnace body having the combustion chamber and a partition plate provided in the furnace body, and the partition plate is provided with a large number of through holes,
The air introduced into the combustion furnace is supplied to the combustion chamber through the numerous through-holes of the partition plate,
The heat storage hot air heater according to any one of claims 1 to 4, wherein the partition plates are arranged along the blowing direction of the air from the plurality of through holes.

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