WO2015004935A1

WO2015004935A1 - Boiler

Info

Publication number: WO2015004935A1
Application number: PCT/JP2014/052471
Authority: WO
Inventors: 草平秋永; 智浩大久保
Original assignee: 三浦工業株式会社
Priority date: 2013-07-12
Filing date: 2014-02-03
Publication date: 2015-01-15
Also published as: JP6171647B2; JP2015017777A

Abstract

Provided is a boiler that has a simple piping arrangement during installation and that can be made compact. A boiler (1) comprises: a vessel (10) that generates steam by a liquid being heated by way of burning a fuel; a water supply channel (20) for supplying the liquid to the vessel (10); an air supply channel (30) for supplying air for combustion to the vessel (10); an exhaust channel (50) by which combustion gas generated by the vessel (10) is discharged and that is disposed on the side of the vessel (10); an economizer (60) that is disposed in the exhaust channel (50) and that performs heat exchange between the liquid flowing in the water supply channel (20) and the combustion gas flowing in the exhaust channel (50); an air heater (70) that is disposed further downstream than the economizer (60) in the exhaust channel (50) and that performs heat exchange between the air for combustion flowing in the air supply channel (30) and the combustion gas flowing in the exhaust channel (50); and a blower (80) that is disposed near the air heater (70) and that sends air for combustion to the air supply channel (30).

Description

boiler

The present invention relates to a boiler. This application claims priority based on Japanese Patent Application No. 2013-146336 for which it applied to Japan on July 12, 2013, and uses the content here.

Conventionally, boilers that generate steam by heating water with combustion gas generated by burning fuel in a can body are known. In such a boiler, heat recovery is performed from the combustion gas by providing an economizer that exchanges heat between the water supplied to the can body and the combustion gas after being used to generate steam. The heat efficiency is improved. In order to further improve the thermal efficiency of the boiler, a boiler is further proposed that further includes an air heater that performs heat exchange between the combustion air supplied to the can body and the combustion gas in addition to the economizer (for example, , See Patent Document 1).

In the boiler proposed in Patent Document 1, an air heater is arranged on the upstream side of a blower that feeds combustion air into a can body, and heat exchange between the combustion air and the combustion gas is performed.

JP-A-11-118104

However, in the boiler proposed in Patent Document 1, since the air heater is disposed in the air supply path upstream of the blower, the distance from when the combustion air is heat-exchanged until it is supplied to the can body is long. turn into. Thus, in the boiler proposed by patent document 1, since the air supply path which supplies combustion air to a can body will become long, the management of piping at the time of installing a boiler will become complicated, and a boiler will be used. It cannot be configured compactly.

This invention solves the said subject, and it is easy to manage the piping at the time of installation, and it aims at providing the boiler which can be reduced in size.

The present invention comprises a can body that generates steam by burning fuel to heat a liquid, a water supply path that supplies liquid to the can body, an air supply path that supplies combustion air to the can body, An exhaust path that is disposed at a side of the can body and discharges combustion gas generated in the can body, and a liquid that is disposed in the exhaust path and that flows through the water supply path and the combustion gas that flows through the exhaust path. Between the combustion air flowing through the air supply passage and the combustion gas flowing through the exhaust passage, and disposed downstream of the water supply heater in the exhaust passage. The present invention relates to a boiler that includes an air heater that performs replacement and a blower that is disposed in the vicinity of the exhaust passage and feeds combustion air into the air supply passage.

The feed water heater is disposed at a lower portion on the side of the can body, the air heater is disposed above the feed water heater, and the blower is disposed in the vicinity of the feed water heater. It is preferable.

Further, it is preferable that the can body is formed in a cylindrical shape, and the exhaust passage is disposed between the can body and the blower.

According to the present invention, it is possible to provide a boiler that can be easily routed for installation and can be made compact.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external view of the boiler which concerns on 1st Embodiment of this invention, Fig.1 (a) is a front view of the said boiler, FIG.1 (b) is a right view of the said boiler, FIG.1 (c) Is a rear view of the boiler, and FIG. 1D is a plan view of the boiler. It is sectional drawing of the can part in the boiler which concerns on 1st Embodiment of this invention, and is a figure which shows the AA line cross section of FIG. (D). FIG. 3 is a sectional view taken along line BB in FIG. It is the figure which showed typically the external appearance of the boiler which concerns on 2nd Embodiment of this invention, Fig.4 (a) is a top view of the said boiler, FIG.4 (b) is a front view of the said boiler.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>
First, the boiler 1 which concerns on 1st Embodiment of this invention is demonstrated.
FIG. 1 is an external view of a boiler 1 according to the first embodiment of the present invention.
As shown in FIG. 1, the boiler 1 includes a can body 10, a water supply path 20 that supplies liquid to the can body 10, an air supply path 30 that supplies combustion air to the can body 10, and an air supply path 30. A gas supply line 40 for supplying fuel gas (see FIG. 2), an exhaust path 50 for discharging combustion gas generated in the can 10, a liquid disposed in the exhaust path 50 and flowing through the water supply path 20 and the exhaust path 50 An economizer (a feed water heater according to the present invention) 60 that exchanges heat with the combustion gas that circulates in the exhaust gas, and the combustion air that circulates in the air supply passage 30 and the exhaust passage 50 that is disposed in the exhaust passage 50. An air heater (air heater according to the present invention) 70 that exchanges heat with the combustion gas, and a blower 80 that sends combustion air into the air supply path 30 are provided.

The can 10 generates steam by burning fuel and heating a liquid. As shown in FIGS. 2 and 3, the can body 10 includes a boiler housing 11, a plurality of water pipes 12, a connecting wall 13, a lower header 14, an upper header 15, and a burner 17.
The boiler housing | casing 11 comprises the external shape of the can 10, and is formed in the rectangular parallelepiped shape of planar view. An air supply port 18 is formed in the first side surface 11 a located on one end side in the longitudinal direction of the boiler housing 11, and a second side surface 11 b located on the other end side in the longitudinal direction of the boiler housing 11 is An exhaust port 19 is formed.

A front end portion of an air supply path 30 to be described later is connected to the air supply port 18. A base end portion of an exhaust passage 50 to be described later is connected to the exhaust port 19.
The plurality of water pipes 12 are disposed in the boiler casing 11 so as to extend in the vertical direction, and are disposed at predetermined intervals in the longitudinal direction and the width direction of the boiler casing 11.
In the present embodiment, the plurality of water tubes 12 are arranged along the longitudinal direction at the outer water tube group 12 a arranged along the side portion extending in the longitudinal direction of the boiler housing 11 and at the center portion in the width direction of the boiler housing 11. The central water pipe group 12b is disposed between the outer water pipe group 12a and the central water pipe group 12b.

The connection wall 13 connects the water pipes 12 arranged adjacent to each other in the outer water pipe group 12a.
The lower header 14 is configured by a rectangular parallelepiped container having a rectangular shape in plan view, and is disposed at the lower portion of the boiler casing 11. The lower header 14 is connected to lower ends of the plurality of water pipes 12. Water is supplied to the lower header 14, and water is supplied from the lower header 14 to the plurality of water pipes 12.

The upper header 15 is configured by a rectangular parallelepiped container having a rectangular shape in plan view, and is disposed on an upper portion of the boiler casing 11. The upper header 15 is connected to the upper ends of the plurality of water pipes 12. Steam generated in the plurality of water pipes 12 is collected in the upper header 15. The steam collected in the upper header 15 is led out to the outside through a steam outlet pipe 16 (see FIG. 1).
The burner 17 is disposed in the air supply port 18.

The water supply channel 20 is a water channel through which a liquid serving as can water flows, and supplies the liquid to the lower header 14 (see FIG. 2) of the can body 10. As shown in FIG. 1B, the water supply channel 20 has a portion that extends downward along the side surface on the exhaust side of the can body 10.

The air supply path 30 has a downstream end connected to the air supply port 18. The air supply path 30 supplies combustion air fed from a blower 80 described later to the can body 10.
As shown in FIG. 1, the air supply path 30 includes an upward air supply path part 31, a first horizontal air supply path part 32, a first downward air supply path part 33, and a second horizontal air supply path part 34. And a second downward air supply passage 35.

As illustrated in FIG. 1C, the upward air supply path portion 31 extends upward from a connection portion with a blower 80 described later.
The 1st horizontal air supply path part 32 is connected to the upper end of the upward air supply path part 31, and is extended in a horizontal direction, as shown in FIG.1 (c) and (d).
The first downward air supply path section 33 extends downward from the tip of the first horizontal air supply path section 32 as shown in FIGS.

As shown in FIG. 1 (b), the second horizontal air supply passage portion 34 extends substantially horizontally from the front end portion of the first downward air supply passage portion 35 above the can body 10.
As shown in FIGS. 1A and 1B, the second downward air supply passage portion 35 extends downward from the tip of the second horizontal air supply passage portion 34 along the first side surface 11 a of the can 10. It extends and is connected to the air inlet 18.

According to the air supply path 30 described above, the combustion air sent out from the blower 80 circulates upward in the upward air supply path section 31 as shown in FIG. 1 and then the first horizontal air supply path section. 32 circulates in the horizontal direction, then circulates downward in the first downward air supply passage portion 33, then circulates in the second horizontal air supply passage portion 34 in the horizontal direction, and finally the second downward air supply passageway. It is supplied to the can 10 by flowing downward through the portion 35. In the second downward air supply passage 35, fuel gas is supplied from a gas supply line 40 described later, and the fuel gas and combustion air are mixed.

The gas supply line 40 is connected to the second downward air supply path 35. The gas supply line 40 is provided with an adjustment valve 41 and a plurality of nozzles 42.
The adjustment valve 41 adjusts the flow rate of the fuel gas supplied to the air supply path 30. The plurality of nozzles 42 are disposed at the distal end portion of the gas supply line 40 and eject fuel gas into the air supply path 30. The tip ends of the plurality of nozzles 42 extend upward, that is, in a direction facing the flow direction of the combustion air in the supply passage 30 (see FIG. 2).

The exhaust path 50 is arrange | positioned at the 2nd side surface 11b side of the can 10 (refer FIG. 2). The exhaust path 50 is connected to the second side surface 11b of the can body 10 (boiler casing 11). The exhaust passage 50 discharges the combustion gas generated by burning the mixed gas inside the can body 10. The exhaust passage 50 has an upward exhaust passage portion 51 that extends upward along the second side surface 11b.
According to the exhaust path 50 described above, the combustion gas discharged from the can body 10 is exhausted through the upward exhaust path portion 51 upward as shown in FIG.

The economizer 60 is disposed in the lower portion of the exhaust body 50 on the second side surface 11b side of the can body 10 (boiler casing 11). The economizer 60 performs heat exchange between the water flowing through the water supply channel 20 and the combustion gas flowing through the exhaust channel 50 (upward exhaust channel portion 51).
More specifically, the economizer 60 heats water by exchanging heat between water flowing from the upper side to the lower side of the water supply channel 20 and combustion gas flowing from the lower side to the upper side of the upward exhaust channel portion 51. .

The air heater 70 is disposed downstream of the economizer 60 in the exhaust passage 50. More specifically, as shown in FIG. 1, the air heater 70 is disposed in a portion where the first downward air supply passage portion 33 and the upward exhaust passage portion 51 are located above the economizer 60. The air heater 70 performs heat exchange between the combustion air flowing through the air supply passage 30 and the combustion gas flowing through the exhaust passage 50 (upward exhaust passage portion 51).
More specifically, the air heater 70 performs heat exchange between the combustion air that circulates in the first downward air supply passage portion 33 from above and the combustion gas that circulates in the upward exhaust passage portion 51 from below. To heat the combustion air.

The blower 80 is disposed in the vicinity of the exhaust passage 50. More specifically, as shown in FIG. 1, the blower 80 is disposed at a lower portion on the left side of the exhaust passage 50 and at a lower portion on the left side of the boiler 1. The blower 80 is connected to the upstream end of the air supply path 30. The blower 80 has air wheel blades.
The air wheel blades are disposed inside the blower 80. As the air wheel blades rotate, the combustion air is drawn into the blower 80 and sent into the air supply path 30 described later.

Next, the operation of the boiler 1 will be described.
The boiler 1 draws combustion air by the blower 80 and sends it out to the air supply path 30.
In the air supply path 30, the combustion air sent out from the blower 80 circulates upward in the upward air supply path portion 31. The combustion air that has passed through the upward air supply passage portion 31 flows through the first horizontal air supply passage portion 32 and then flows through the first downward air supply passage portion 33.

The combustion air flowing through the first downward air supply passage portion 33 is heated by the air heater 70 by exchanging heat with the combustion gas discharged from the can 10 and flowing through the exhaust passage 50. Here, as described above, since the blower 80 is disposed in the vicinity of the exhaust passage 50, the distance between the blower 80 and the air heater 70 disposed in the exhaust passage 50 is shortened. Therefore, in the boiler 1, it is not necessary to configure a long path from the blower 80 to the air heater 70 (upward air supply path portion 31, first horizontal air supply path portion 32) in the air supply path 30.
Note that the combustion gas discharged from the can 10 flows through the water supply channel 20 in the economizer 60 before the heat exchange (second heat exchange) in the air heater 70, and the water and heat supplied to the can 10. Exchange (first heat exchange).

Then, the combustion air after heat exchange with the combustion gas flowing through the air heater 70 flows through the second horizontal air supply passage 34 and then the second downward air supply passage 35. Circulate.

In the second downward air supply passage 35, the fuel gas is supplied through the gas supply line 40 and a plurality of nozzles 42 provided at the tip of the gas supply line 40, and the fuel gas and the combustion air are mixed.
The mixed gas obtained by mixing the fuel gas and the combustion air is supplied to the inside of the can body 10 through the air supply port 18.

In the can 10, the mixed gas is injected by the burner 17 and burned. By the combustion of the mixed gas, the water (can water) supplied from the above-described water supply channel 20 and disposed in the water pipe disposed inside the can body 10 boils to generate steam. The steam generated in the water pipe is stored in the upper header 15 and then led out to the outside through the steam outlet pipe 16.

On the other hand, the combustion gas generated by the mixed gas burning in the gas flow space in the can 10 is discharged from the exhaust port 19 to the exhaust path 50. The combustion gas discharged from the exhaust passage 50 is discharged to the outside after being subjected to the first heat exchange and the second heat exchange described above (see FIG. 1B).

The boiler 1 according to the first embodiment of the present invention has the following effects.
(1) In the boiler 1, the exhaust path 50 is disposed in the vicinity of the can body 10, and the blower 80 that sends combustion air to the air supply path 30 is disposed in the vicinity of the exhaust path 50. Thereby, the distance from the air blower 80 to the air heater 70 arrange | positioned at the exhaust path 50 can be shortened. Therefore, the boiler 1 according to the present embodiment can be easily installed and can be installed in a compact manner.
Moreover, since the boiler 1 can be installed compactly, there is little loss of the heat of the combustion air after heating with the air heater 70 or combustion gas.

(2) The economizer 60 was disposed at the lower part of the exhaust passage 50 extending vertically on the side of the can 10. Further, the air heater 70 is disposed above the economizer 60, and the blower 80 is disposed in the vicinity of the economizer 60. The boiler 1 includes both an economizer and an air heater, but with such an arrangement, the boiler 1 can be made compact.

Second Embodiment
Next, a boiler 1A according to a second embodiment of the present invention will be described.
In addition, about the boiler 1A which concerns on 2nd Embodiment, the boiler 1 which concerns on 1st Embodiment is demonstrated about a different structure, and description is abbreviate | omitted about the same structure.
FIG. 4 is a diagram schematically showing the appearance of a boiler 1 according to the second embodiment of the present invention, FIG. 4 (a) is a plan view of the boiler, and FIG. 4 (b) is a diagram of the boiler. It is a front view.

The boiler 1A of the second embodiment is different from the first embodiment mainly in the shape of the can body 10A and the shape of the exhaust passage 50A.
As shown in FIG. 4, the can body 10A has a cylindrical shape. The exhaust passage 50A is disposed between the can body 10A and the blower 80A. That is, since the can body 10A, the exhaust passage 50A, and the blower 80A are arranged on a straight line in the plan view of the boiler 1A, it is possible to arrange the supply passage 30A without making it long ( (See FIG. 4 (a)).

The exhaust passage 50A has a downward exhaust passage portion 52A and an upward exhaust passage portion 51A.
According to the exhaust path 50A, as shown in FIG. 4B, the combustion gas discharged from the can body 10A flows downward through the downward exhaust path part 52A and then moves upward through the upward exhaust path part 51A. It is distributed and discharged.
The economizer 60A is disposed in a portion of the exhaust passage 50A where the downward exhaust passage portion 52A is located.

In the second embodiment, the combustion gas discharged to the exhaust passage 50A flows downward through the economizer 60A as shown in FIG. In the economizer 60A, the first heat exchange is performed between the combustion gas flowing through the downward exhaust passage 52A and the water flowing through the water supply passage 20A. Then, the combustion gas that has flowed through the economizer 60A and performed the first heat exchange flows through the air heater 70A in the middle of flowing upward through the upward exhaust passage 51A. In the air heater 70A, a second heat exchange is performed between the combustion gas flowing through the upward exhaust passage 51A and the combustion air flowing through the supply passage 30A (first downward supply passage 33A).
The combustion gas after passing through the air heater 70A and performing the second heat exchange flows through the upward exhaust passage 51A and is discharged.

The boiler 1A according to the second embodiment of the present invention has the following effects in addition to (1) and (2) described above.
(3) The can body 10A was configured in a cylindrical shape, and the exhaust passage 50A was disposed between the can body 10A and the blower 80A. That is, the can body 10A, the exhaust passage 50A, and the blower 80A are arranged on a straight line in a plan view of the boiler 1A. Thereby, the air supply path 30A and the exhaust path 50A can be crossed in the middle of the path from the blower 80A toward the can body 10A. Accordingly, the air heater 70A can be arranged without lengthening the air supply passage 30A for sending combustion air from the blower 80A to the can body 10A, and thus the boiler 1A can be made compact.

The preferred embodiments of the boiler of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and can be modified as appropriate.

DESCRIPTION OF SYMBOLS 1,1A ...

Boiler

10, 10A ... Can

body

20, 20A ...

Supply channel

30, 30A ...

Supply channel

50, 50A ...

Exhaust channel

60, 60A ... Economizer (supply water heater)
70, 70A ... Air heater (air heater)
80, 80A ... Blower

Claims

A can body that generates steam by burning a fuel and heating a liquid;
A water supply channel for supplying liquid to the can body;
An air supply passage for supplying combustion air to the can body;
An exhaust passage that is disposed at a side of the can body and discharges combustion gas generated in the can body;
A water heater that is disposed in the exhaust passage and exchanges heat between the liquid flowing through the water supply passage and the combustion gas flowing through the exhaust passage;
An air heater that is disposed on the downstream side of the feed water heater in the exhaust passage, and exchanges heat between the combustion air flowing through the air supply passage and the combustion gas flowing through the exhaust passage;
A boiler provided with a blower that is disposed in the vicinity of the exhaust passage and feeds combustion air into the air supply passage.
The feed water heater is disposed at a lower portion on the side of the can body,
The air heater is disposed above the feed water heater,
The boiler according to claim 1, wherein the blower is disposed in the vicinity of the feed water heater.
The can body is configured in a cylindrical shape,
The boiler according to claim 2, wherein the exhaust path is disposed between the can body and the blower.