Heating system and heating method

Abstract

To provide a heating system which can suppress the occurrence of dew condensation in an indoor space.SOLUTION: A heating system 200 according to the present disclosure comprises: a burner 150; an air-sending (air return) duct 10 for sending air to the burner 150; a fuel (oxygen) supply part 30 for supplying fuel containing oxygen atoms to the burner 150; an air supply duct 20 for supplying combustion air which is generated by the combustion of a mixture of air and fuel in the burner 150 indoors; a heat exchanger 50 for exchanging heat between the air in the air-sending duct 10 and the combustion air in the air supply duct 20; and a discharge part 60 for discharging drain water D which is produced by the heat exchange.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a heating system and a heating method. [Background technology]

[0002] Hydrogen fuel is used as fuel in heating systems for heating buildings such as factories. Unlike heavy oil and city gas, hydrogen fuel does not emit CO x and S.O. x There is no risk of emitting toxic gases or unpleasant odors such as those mentioned above. When using heavy oil or city gas, it is necessary to exchange heat between the combustion air and the indoor air before exhausting the combustion air, but when using hydrogen fuel, the combustion air can be blown directly into the indoor space.

[0003] As a related technique, for example, Patent Document 1 discloses a hydrogen fuel heating system having a reformer that generates hydrogen by reacting hydrocarbons or alcohol contained in a liquid hydrogen raw material with water, and a heating device that burns the hydrogen supplied by the reformer and heats the air inside the room with the heat of combustion of the hydrogen. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 11-281160 Summary of the Invention [Problem to be solved by the invention]

[0005] 4 is a schematic diagram showing an overview of a heating system 201 according to another related technique. The heating system 201 includes a burner 150 provided in a heating device (not shown) and a duct 101 that carries combustion air from the burner 150. When hydrogen fuel is burned by the burner 150, the combustion air generated by the combustion moves inside the duct 101. In the following description, the combustion air is referred to as supply air SA (SA). The supply air SA moves inside the duct 101 and is blown out into the indoor space through an air supply port 121 provided in the duct 101.

[0006] Hydrogen atoms contained in hydrogen fuel combine with oxygen to become water, which exists as water vapor in the supply air SA. Therefore, if the supply air SA is blown directly into a room for heating, the supply air SA may cool in the room and cause condensation. The risk of condensation is particularly high in metal equipment installed in the perimeter zone.

[0007] In view of the above-mentioned problems, an object of the present disclosure is to provide a heating system and a heating method capable of suppressing the occurrence of condensation in an indoor space. [Means for solving the problem]

[0008] The heating system according to the present disclosure comprises: Burna and an air supply duct for supplying air to the burner; a fuel supply unit for supplying fuel containing hydrogen atoms to the burner; an air supply duct for supplying combustion air generated by the combustion of the mixture of the air and the fuel in the burner into a room; a heat exchanger for exchanging heat between the air in the air supply duct and the combustion air in the air supply duct; and a drain portion for discharging drain water generated by the heat exchange.

[0009] The heating method according to the present disclosure comprises: Delivering air to the burner using an air delivery duct; supplying fuel containing hydrogen atoms to the burner; supplying combustion air generated by burning the mixture of the air and the fuel in the burner into a room using an air supply duct; performing heat exchange between the air and the combustion air using a heat exchanger disposed between the air supply duct and the air intake duct; and a step of discharging drain water generated by the heat exchange. Effect of the Invention

[0010] The heating system and heating method according to the present disclosure make it possible to suppress the occurrence of condensation in an indoor space. [Brief description of the drawings]

[0011] [Figure 1] 1 is a schematic diagram showing an overview of a heating system according to an embodiment; [Diagram 2] 2 is a cross-sectional view of the duct according to the embodiment taken along line AA' in FIG. [Diagram 3] FIG. 11 is a cross-sectional view of a duct in a modified example. [Figure 4] FIG. 1 is a schematic diagram showing an overview of a heating system according to a related art. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Fig. 1 is a schematic diagram showing an overview of a heating system 200 according to an embodiment.

[0013] The heating system 200 is a system that heats an indoor space that is a target for heating. The heating system 200 may be installed in a factory, for example, and heat a work area in the factory where workers work. However, the heating system 200 may be applied to various buildings such as offices, hotels, hospitals, factories, theaters, and stores.

[0014] 1, the heating system 200 includes a burner 150, a hydrogen (fuel) supply unit 30, and a duct (piping) 100. The heating system 200 is a system that burns air taken in from an indoor space together with fuel in the burner 150, and supplies the combustion air generated by the combustion back to the indoor space.

[0015] The right-handed xyz coordinate system shown in FIG. 1 is for the convenience of explaining the positional relationship of the components. The positive direction of the z-axis is vertically upward, and the xy plane is a horizontal plane. The xy plane may be parallel to the floor surface of the indoor space, for example. Here, the x-axis indicates the axial direction (longitudinal direction) of the duct 100. The y-axis indicates the width direction of the duct 100. The z-axis indicates the height direction of the duct 100. These are only examples, and the arrangement of the duct 100 may be changed as appropriate. These coordinates shown in FIG. 1 are common to the drawings in this embodiment. Each configuration of the heating system 200 will be described below.

[0016] The hydrogen supply unit 30 supplies hydrogen to the burner 150. The burner 150 burns a mixture of indoor air sent from the duct 100 and hydrogen supplied from the hydrogen supply unit 30. The fuel supplied by the hydrogen supply unit 30 is not limited to hydrogen. For example, it may be city gas, heavy oil, ammonia, etc. The present embodiment can be applied to any fuel containing hydrogen atoms, without being limited to these, since the combustion air contains water vapor. The fuel may be gas or liquid.

[0017] The duct 100 is a piping facility capable of transporting gas and liquid. The duct 100 is connected to a heating device (not shown) equipped with a burner 150. The duct 100 is equipped with a return air port 111 for taking in air from an indoor space. The duct 100 takes in air from the indoor space through the return air port 111 and supplies the taken-in air to the burner 150 of the heating device.

[0018] In the following description, the air taken in from the indoor space is referred to as return air RA. The flow of the return air RA is indicated by solid arrows in Fig. 1. The duct 100 may be connected to other ducts. The duct 100 may also take in outside air from outside the building.

[0019] The duct 100 has an air intake port 121 for blowing out the supply air SA into the indoor space. The duct 100 supplies the supply air SA generated by combustion in a burner 150 of the heating device to the indoor space via the air intake port 121. The flow of the supply air SA is indicated by dashed arrows in FIG. 1. Note that the number of burners 150, return air ports 111, and supply air ports 121 is not limited to that shown in FIG. 1. Other ducts or devices may be connected to the return air port 111 and the supply air port 121, and return air and supply air may be discharged from the ends of the connected ducts, etc.

[0020] The duct 100 may be made of, for example, a cylindrical member extending in the longitudinal direction (x-axis direction). The duct 100 may be made of, for example, a metal member such as iron. The duct 100 may be configured to be bendable in the radial direction (y-axis direction), and may be fixed to a desired position on the ceiling of a building or the like using a fixing member (not shown) or the like.

[0021] The duct 100 also includes a heat exchanger 50 therein. Here, the space within the duct 100 is divided into two spaces by the heat exchanger 50, and the supply air SA and the return air RA move through each of the divided spaces. The heat exchanger 50 exchanges heat between the return air RA and the supply air SA. The duct 100 may be divided into three or more spaces. The return air RA or the supply air SA may flow through part of the divided spaces.

[0022] The heat exchanger 50 may be, for example, a plate-like member configured to pass through the central axis of the duct 100 and be parallel to the xy plane. The heat exchanger 50 may be made of, for example, a metal material such as iron, stainless steel, titanium, or aluminum. Not limited to this, the heat exchanger 50 may be made of other materials capable of sensible heat exchange between the return air RA and the supply air SA. The surface of the heat exchanger 50 does not have to be flat. For example, the surface of the heat exchanger 50 may be provided with irregularities to increase the heat exchange area.

[0023] The heat exchanger 50 may divide the space within the duct 100 into upper and lower spaces, or into inside and outside spaces. Here, a description will be given assuming that the first space divided by the heat exchanger 50 functions as the return air duct 10, and the second space functions as the supply air duct 20. Below, a description will be given of the case where the duct 100 is divided into upper and lower spaces, and the case where the duct 100 is divided into inside and outside spaces (variations).

[0024] Fig. 2 is a cross-sectional view of the duct (piping) 100 taken along line A-A' shown in Fig. 1. Here, the duct 100 is divided into upper and lower parts by a heat exchanger 50. As shown in the figure, the duct 100 is divided by the heat exchanger 50 into an upper side (first space) and a lower side (second space).

[0025] The upper side of the space partitioned by the heat exchanger 50 takes in the return air RA via the return air port 111. Here, the flow path of the return air RA formed by this space will be referred to as the return air duct 10a for explanation. The return air duct 10a has a semi-cylindrical space surrounded by the surface (positive z-axis direction side) of the heat exchanger 50 and a portion of the inner wall (inner circumferential surface) of the duct 100 located above the heat exchanger 50 (positive z-axis direction side). A connection hole 80 for connecting to the return air port 111 is provided at the upper end of the return air duct 10a.

[0026] The lower side of the space partitioned by the heat exchanger 50 blows out the supply air SA into the indoor space through the supply air port 121. Here, the flow path of the supply air SA formed by the space is referred to as the supply air duct 20a for explanation. The supply air duct 20a has a semi-cylindrical space surrounded by the rear surface (z-axis negative direction side) of the heat exchanger 50 and a portion of the inner wall (inner circumferential surface) of the duct 100 that is located below the heat exchanger 50 (z-axis negative direction side). A connection hole 90 for connecting to the supply air port 121 is provided at the lower end of the supply air duct 20a.

[0027] The supply air SA in the supply air duct 20a is combustion air from the burner 150. Therefore, it is hotter than the return air RA in the return air duct 10a, which is return air from the indoor space. The heat exchanger 50 exchanges heat between the supply air SA in the supply air duct 20a and the return air RA in the return air duct 10a. As a result, the water vapor in the supply air SA condenses to generate drain water D.

[0028] In order to prevent the drain water D from dropping into the indoor space, a jaw portion 70 is provided so as to rise from the edge of the connection hole 90. The drain water D can remain in the air supply duct 20a until the water level reaches the height of the jaw portion 70.

[0029] The amount of water vapor in the supply air SA is reduced by the heat exchange in the heat exchanger 50. Therefore, the amount of water vapor in the supply air SA supplied from the supply air duct 20a is reduced, making it possible to suppress the occurrence of condensation in the indoor space.

[0030] In addition, the temperature of the return air RA increases due to the heat exchange. As a result, the return air RA supplied to the burner 150 becomes hotter, enabling efficient combustion.

[0031] Furthermore, the latent heat of condensation of water can be extracted as sensible heat by condensing the water vapor in the supply air SA, which further increases the temperature of the return air RA, enabling more efficient combustion.

[0032] The discharge unit 60 is a mechanism for discharging the drain water D. The discharge unit 60 may be, for example, a valve. The drain water D may be discharged by the discharge unit 60 at any timing depending on the amount of the drain water D accumulated at the lower end of the intake air duct 20a. For example, the drain water D may be retained in the intake air duct 20a without being discharged during operation of the heating system 200, and may be discharged from the discharge unit 60 after the operation is terminated or when the water level of the drain water D exceeds the jaw portion 70. In this way, the high-temperature intake air SA can be retained in the intake air duct 20a, so that heating can be performed efficiently. In addition, the cooled drain water D can be prevented from reducing the combustion efficiency when the system is operated again.

[0033] As shown in Fig. 1, the duct 100 is branched into two. One of the branches becomes a space connected to the return air duct 10a, and the other becomes a space connected to the supply air duct 20a. Return air RA is supplied to the burner 150 from the space connected to the return air duct 10a. Supply air SA is supplied from the burner 150 to the space connected to the supply air duct 20a. Note that the heat exchanger 50 is not provided in the duct 100 after branching.

[0034] (Modification) A modified example of the duct 100 will be described with reference to Fig. 3. Fig. 3 is a cross-sectional view of the duct (piping) 100. In this modified example, the duct 100 is divided into an inside (first space) and an outside (second space) by a heat exchanger 50. The heat exchanger 50 may be, for example, a cylindrical member having the same central axis as the central axis of the duct 100.

[0035] The outside of the space partitioned off by the heat exchanger 50 takes in the return air RA via the return air port 111. Here, the flow path of the return air RA formed by this space will be referred to as the return air duct 10b for explanation. The return air duct 10b has a space surrounded by the outer wall (outer peripheral surface) of the heat exchanger 50 and the inner wall (inner peripheral surface) of the duct 100. This space has a shape in which the part inside the heat exchanger 50 is hollowed out from the duct 100. A connection hole 80 for connecting to the return air port 111 is provided at the upper end of the return air duct 10b.

[0036] Inside the space partitioned by the heat exchanger 50, the supply air SA is blown out to the indoor space through the supply air port 121. Here, the flow path of the supply air SA formed by the space is referred to as the supply air duct 20b for explanation. The supply air duct 20b has a cylindrical space surrounded by the inner wall (inner peripheral surface) of the heat exchanger 50.

[0037] As in the case where the duct 100 is divided into upper and lower parts by the heat exchanger 50, the supply air SA in the supply air duct 20b is combustion air from the burner 150. Therefore, it is hotter than the return air RA in the return air duct 10b, which is the return air from the indoor space. The heat exchanger 50 exchanges heat between the supply air SA in the supply air duct 20b and the return air RA in the return air duct 10b. As a result, the water vapor in the supply air SA condenses to generate drain water D. The jaw portion 70 is provided so as to rise from the edge of the connection hole 90 and so that the tip of the drain water D reaches the supply air duct 20b. The drain water D can remain in the supply air duct 20b until the water level reaches the height of the jaw portion 70.

[0038] In this way, it is possible to obtain the same effect as when the duct 100 is divided into upper and lower parts by the heat exchanger 50. Note that detailed explanations of the same configuration as when the duct 100 is divided into upper and lower parts will be omitted. Note that the return air duct 10b and the supply air duct 20b may be arranged in reverse. The inside of the partition by the heat exchanger 50 may be the return air duct 10b, and the outside may be the supply air duct 20b.

[0039] As described above, in the heating system 200 according to this embodiment, the duct 100 sends the return air RA taken in from the indoor space to the burner 150. The burner 150 burns a mixed gas of the return air RA and hydrogen supplied from the hydrogen supply unit 30, and supplies the supply air SA, which is the combustion air, to the duct 100. Inside the duct 100, the heat exchanger 50 exchanges heat between the return air RA and the supply air SA, condensing the water vapor in the supply air SA and generating drain water D. As a result, the amount of water vapor in the supply air SA is reduced, and the duct 100 can supply the supply air SA with a reduced amount of water vapor to the indoor space. Therefore, the occurrence of condensation in the indoor space can be suppressed.

[0040] Furthermore, by performing heat exchange by the heat exchanger 50, the latent heat of condensation of the water vapor in the supply air SA can be extracted as sensible heat of the air to be supplied to the primary side of the burner 150. Therefore, the sensible heat extracted from the latent heat of condensation can be efficiently used as energy for heating.

[0041] In this way, according to the present disclosure, it is possible to efficiently heat an indoor space while suppressing the occurrence of condensation in the indoor space. By using hydrogen fuel as a heating fuel, it is also possible to contribute to reducing carbon dioxide emissions.

[0042] The present disclosure is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit and scope of the present disclosure. For example, in the above description, a plate-shaped member or a cylindrical member is used as the heat exchanger 50, but the present disclosure is not limited to this. The heat exchanger 50 may be, for example, a shell-and-tube type heat exchanger or a plate type heat exchanger. In this case, the heat exchanger 50 may be provided as a part of the heating device.

[0043] In addition, in this embodiment, a cylindrical member is used as the duct 100, but this is not limited thereto. For example, a rectangular member may be used as the duct 100. Also, instead of providing a separate heat exchanger 50, two ducts 100 may be brought into contact with each other to perform heat exchange. [Explanation of symbols]

[0044] 10 Return air (supply air) duct 10a Return air duct 10b Return air duct 20 Air supply duct 20a Air supply duct 20b Air supply duct 30 Hydrogen (fuel) supply section 50 heat exchanger 60 Discharge section 70 Jaw 80 Connection hole 90 Connection hole 100 Duct (piping) 101 Duct 111 Return air port 121 Air supply port 150 Burner 200 Heating System 201 Heating System D Drain water RA return air SA Air Supply

Claims

1. Burna and an air supply duct for supplying air to the burner; a fuel supply unit for supplying fuel containing hydrogen atoms to the burner; an air supply duct for supplying combustion air generated by the combustion of the mixture of the air and the fuel in the burner into a room; a heat exchanger that exchanges heat between the air in the air supply duct and the combustion air in the air supply duct; A drain portion for discharging drain water generated by the heat exchange, The piping is partitioned by the heat exchanger extending along the longitudinal direction of the piping, The first space partitioned by the heat exchanger is the air supply duct, and the second space is the air supply duct, The longitudinal directions of the air supply duct, the air supply duct, and the heat exchanger are the same. Heating system.

2. The air intake duct has a jaw portion that is provided so as to rise from the edge of a connection hole for connecting to an air intake port.

2. The heating system of claim 1.

3. The piping is divided into upper and lower parts by the heat exchanger, The first space on the upper side is the air supply duct, and the second space on the lower side is the air supply duct.

3. A heating system according to claim 1 or 2.

4. The piping is divided into inside and outside by the heat exchanger, The first space on the outside is the air supply duct, and the second space on the inside is the air supply duct.

3. A heating system according to claim 1 or 2.

5. Delivering air to the burner using an air delivery duct; supplying fuel containing hydrogen atoms to the burner; supplying combustion air generated by burning the mixture of the air and the fuel in the burner into a room using an air supply duct; performing heat exchange between the air and the combustion air using a heat exchanger disposed between the air supply duct and the air intake duct; and discharging drain water generated by the heat exchange. The piping is partitioned by the heat exchanger extending along the longitudinal direction of the piping, The first space partitioned by the heat exchanger is the air supply duct, and the second space is the air supply duct, The longitudinal directions of the air supply duct, the air supply duct, and the heat exchanger are the same. Heating method.

Images