JP2699245B2 - Modular water tube boiler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a water pipe boiler which is widely used in all fields such as ordinary business for heating and heating, industrial and air conditioning to power generation and the like. Japanese Patent Application Laid-Open No. 2-27220, which is an invention of five inventors.
No. 7 “Hot-water boiler and its combustion method” constitutes a heat-collecting water-tube-inserted combustion chamber, and the heat-collecting-water-insertion-type combustion chamber and a contact pipe group located downstream of the heat-collecting water-tube boiler are configured as water pipe groups having substantially the same structure. As a water pipe boiler, one in which each water pipe in the flow direction of the combustion gas is formed in a uniform panel shape is used as a basic element, and the basic unit in which the water pipe row is formed in a panel shape is a header. The boiler of the present invention can be designed in accordance with the area and height of the installation location by appropriately combining the basic module with the basic module and appropriately combining the width and the depth of the basic module. Yes,
It is intended to provide a modular water tube boiler having a large degree of freedom in design.

[0002]

2. Description of the Related Art A conventional water tube boiler is composed of a combustion chamber having a large combustion space surrounding a flame emitted from a burner by a furnace wall water tube or the like, and a contact heat transfer surface comprising a group of water tubes flowing downstream. Was based on In that case, a conventional combustion chamber is disclosed in, for example, Japanese Patent Application Laid-Open No. 3-260501 (FIG. 5).
As shown in FIG. 6, a radiant heat transfer water pipe wall is disposed around the fire flame defined by the burner, and generally constitutes one large space. That is, in the case of the conventional combustion chamber, the size (diameter and length) of the fire flame emitted from the burner generally increases in proportion to the capacity (that is, the amount of combustion) of the boiler in a certain function relation. It is necessary to further increase the size of the combustion chamber according to the similarity law from the relation of the heat transfer surface heat load, and generally, the size of the conventional boiler combustion chamber is from the small capacity boiler to the large capacity boiler. (I.e., the amount of evaporation and the amount of combustion). Thus, the size (volume) of the boiler combustion chamber is so large that it occupies 40 to 70% of the total size of the boiler, so that one large space defined by diameter and length or width, depth and length is required. I needed it. This is based on the conventional idea that when the combustion flame emitted from the burner hits the cooling heat transfer surface, the heat transfer surface may burn due to overheating, or the combustion flame may be cooled to generate unburned components. This is because the flame was governed by a design concept that prevents the flame from hitting the heat transfer surface.

[0003]

FIG. 5

[0004]

FIG. 6

[0005] If the conventional design concept as described above is defined as a concept of similarity in the sense that the size of the combustion chamber is defined by similarity, all conventional boilers are governed by this concept of similarity. In order to make the boiler smaller, lighter, and more efficient for that purpose, the only technology for that was to pursue a high-load combustion technology. In other words, the size of the combustion chamber is reduced by reducing the flame emitted from the burner, or the size of the boiler is reduced and improved by shortening the flame length and reducing the combustion chamber like a flat flame burner or a surface combustion burner. Was.

[0006]

However, the above-mentioned prior art has the following problems to be solved. In particular, the problem became more important as the capacity of the boiler was increased. That is, the first problem is that, in any case, the larger the capacity of the boiler is, the larger the required space of the combustion chamber is, the larger the space occupies more than half of the boiler volume, and the size (width and length) ) Must be adjusted to the size of the flame from the burner, which cannot be changed, which has made it possible to design the boiler to the dimensions and area of its installation location. This greatly impaired the freedom of boiler design. For example, the degree of freedom such as changing the vertical and horizontal dimensions of the combustion chamber, or extremely bending the combustion chamber on the way, or adding irregularities to a part of the wall surface and aligning it under the pillar or ceiling beam. However, there was little in the conventional concept of similarity rule.

A second problem is that when the combustion chamber is conventionally configured with a water pipe module, the combustion chamber has a shape surrounding a large space. It is only conceivable to use a water pipe wall module composed of water pipes.In particular, in large capacity boilers, the idea that the cross section of the combustion chamber is a water pipe module, that is, the cross section and the vertical section are composed of water pipe modules has been born. Never If the section was to be made into a module, there were only water pipes around the four surroundings, and there were no water pipes in the middle, and the module could not be formed.

A third problem is that in a conventional boiler, for example, as shown in FIGS. 5 and 6 of JP-A-3-260501, contact between the combustion chamber and the wake is limited to a certain capacity. Even if the water tube group that constitutes the heat transfer surface can be successfully formed into a module, if the boiler becomes a large-capacity boiler, the module must be a separate module from the combustion chamber, and costs due to modularization at the original manufacturing plant Not only does the downtime stop halfway, but it also ends halfway with the intent of making it easier to carry in and assemble the entire boiler into a structure that can be divided when installing the boiler on site. The cost has not increased.

The present invention eliminates the conventional combustion chamber of a large space at all, and combusts a combustion flame into a group of water tubes to burn in the group of water tubes, thereby preventing combustion of the water tubes by promoting combustion and heat transfer. In a way that broke common sense, the entire boiler was made up of only water tubes without space,
By completing a boiler composed of only a small and high-performance water pipe group, and further dividing the boiler elements into substantially the same dimensions and the same shape, which can be appropriately divided, into a modular structure, The objective is to provide a modular water pipe boiler that not only reduces costs at the manufacturing plant, but also facilitates on-site transport, installation and assembly, and simplifies on-site construction.

[0010]

According to the present invention, in order to achieve the above object, first, the entire boiler is constituted by a group of water tubes, and fuel is burned in front of the group of water tubes. In the water pipe boiler in which the downstream water pipe group becomes a contact heat transfer water pipe group, the flow path of the combustion gas is formed by bending a plurality of times in any desired place in the horizontal and / or vertical directions, and before and after the path. In the section, each water pipe in the flow direction of the combustion gas is collectively formed into a panel shape to be a basic element, and an appropriate number of the basic elements are collected by one header to form a basic module, and the header is formed. One or more of the assembled basic modules are attached to the desired number of upper and lower headers, one or more water-side and steam-side connecting pipes, and the shapes and configurations of the basic elements and the basic module are changed to the combustion section of the water pipe group and the following. contact Regardless, some basic modules are collected to form a similar module configuration, one or more of the basic modules can be attached by a water pipe and a steam-side communication pipe, and the shapes of the basic elements and the basic module are changed. Irrespective of the combustion part of the water pipe group and the contact part following the water pipe group, one or more of the basic modules are connected to the drum by a flange or welding of a connecting pipe in a configuration in which some basic modules are collected. And a modular water tube boiler. The second
The modular water pipe boiler according to the first feature, wherein a water passage as a basic element is partially removed at a bent portion of the boiler combustion gas to provide a gas passage. Thirdly, a rectifying sloping wall is provided at an outer corner of a hot gas passage in which a water pipe as a basic element is partially removed at a bent portion of the boiler combustion gas, wherein the rectifying inclined wall is provided. It is about a boiler.

That is, according to the present invention, a conventional combustion chamber requiring a large space is a heat collecting water pipe insertion type combustion chamber having substantially no space as in the above-mentioned JP-A-2-272207, and a water pipe of the conventional combustion chamber is used. In contrast to the group consisting of planar water tube walls receiving radiant heat transfer, the present invention comprises tube nest combustion water tube groups receiving heat transfer superimposed with radiation and contact within the group of water tubes, and thus the combustion of the present invention. Since the chamber is extremely small and is composed only of water pipes that absorb heat to an appropriate combustion gas temperature, the path of the emitted flame in the chamber does not necessarily have to be straight, and a bent portion may be present. That is, it is possible to bend the passage design in the same manner as the contact water tube group in the downstream stream, and furthermore, to make the passage uneven.

[0012] Further, in the conventional combustion chamber, the module was considered only as a four-walled water pipe wall.
In the present invention, an appropriate number of water pipe rows each having substantially the same size and substantially the same shape in the flow direction of the combustion gas in the combustion chamber having the water pipe group are grouped in an appropriate number to form a panel, which is a basic element. Are grouped by one header to form a basic module, so that the combustion chamber water pipe group and the downstream contact water pipe group can have the same module configuration. An element as a boiler water pipe panel is constituted by the and the upper and lower collecting pipes where they are gathered, and the upper and lower collecting pipes of the basic element consisting of the steam and water header and the water pipe group are formed by one or more water side and steam side connecting pipes It is a modular water tube boiler constituted by one or a plurality of the basic modules to be connected.

As a result, the conventional combustion chamber and the module of the contact water pipe group cannot be formed in the same shape and structure, but in the present invention, the contact water pipe group section is replaced with the combustion chamber water pipe group as described above. The structure is the same as that of the part, and each water pipe in the flow direction of the combustion gas is formed into one panel shape as a basic element, and an appropriate number of the basic elements are put together by one header to form a basic module. By doing
The whole can be made almost the same shape, so that a gas passage having a bent portion is formed at an appropriate portion in the middle of the tube nest combustion water tube group constituting the front part and the contact water tube group connected thereto. In the end, the boiler can be adjusted to the size and area of the installation location, which is extremely excellent in the degree of freedom of design.Furthermore, the cost reduction in the manufacturing process by modularizing the entire boiler, as well as the on-site transportation, installation and assembly A more efficient and splittable modular water tube boiler which has been made to be able to be used in a simple and significant manner.

As a further significant feature, firstly, the water pipe rows in the combustion gas flow direction are collectively formed into a water pipe panel as a basic element, and an appropriate number of the basic elements are collected in one header. By using the basic module, the heat load distribution of the water pipes in the flow direction of each of the above water pipe panels becomes the same, and therefore the two-phase flow distribution in the water pipe panels becomes the same. It is possible to significantly simplify the design and achieve safe design. Secondly, by adopting such a basic module structure, it is possible to manufacture, replace, repair, add up, or the like for each basic element or a basic module unit or a smaller basic module unit. Has the advantage that the load can be easily changed.

In the bent portion of the modular water pipe boiler of the present invention when the combustion gas passage is bent, when the number of tube rows in the width direction of the gas passage is small, little consideration is needed for the drift of the flow in the bent portion. However, when the number of pipes arranged in one header constituting the basic module becomes about four or more, a part of the water pipes of the basic element is deleted at the bend so that the distribution in the width direction of the flow becomes as uniform as possible. In addition, it is preferable to provide a slope wall made of a refractory material or the like for rectification at the corner.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIGS. 1 to 5 show one embodiment of the modular water pipe boiler of the present invention, and FIGS. 6 to 8 show other embodiments, FIG.
FIG. 10 is a schematic diagram showing the flow direction of the combustion gas.

[0017]

FIG.

[0018]

FIG. 2

[0019]

FIG. 3

[0020]

FIG. 4

[0021]

FIG. 7

[0022]

FIG. 8

[0023]

FIG. 9

[0024]

FIG. 10

FIG. 1 is a side view of a modular water pipe boiler according to the present invention. (1a) is a membrane wall composed of a water pipe and a fin plate closing between the water pipes, (3a) is an upper collecting pipe, (3a).
b) is a lower collecting pipe, (3c) is a steam header, (3d) is a water header, (4a) is a first steam connecting pipe, and (4b) is a second steam connecting pipe.
Steam connection pipe, (4c) downcomer pipe, (20) flange or weld to assemble the basic module of the present invention, (5)
Denotes a steam drum, and (6) denotes a boiler casing.

FIG. 2 is a view taken in the direction of arrows II-II in FIG. 1, and the flame emitted from the burner (7) attached to the front wall (8) made of a refractory material or the like immediately causes the present invention. After entering the tube nest combustion water tubes (2a) and transferring heat, the combustion gas exits the tube nest combustion portion and the combustion gas of the boiler rear water tube group, which is the first feature of the present invention, is removed. Bend (9
From a), after further heat transfer in the first contact tube group (2b) and the second contact tube group (2c) at the rear, the exhaust gas outlet (1
0).

In this case, according to the present invention, both in the tube nest combustion portion (2a) of the first passage and in the first contact tube group (2b) and the second contact tube group (2c) of the second passage. As described above, the water pipe row in the flow direction of the combustion gas formed in one panel is used as a basic element, and the basic elements are grouped by an appropriate number of headers in the width direction, and a number of water pipes are grouped in each header. The second feature resides in that the basic module is constituted by the groups, whereby the combustion chamber water pipe group can be made to have the same module configuration as the contact water pipe group in the downstream flow. In addition to the above first and second features, the load distribution is the same, and therefore the two-phase flow distribution in the water pipe panel is also the same. Third major feature A. Importantly, by adopting such a configuration, in the process in the entire combustion gas flow direction of the tube nest combustion water pipe group part constituting the front part and the contact water pipe part connected thereto, a bent part is formed at an appropriate part in the middle. The gas passage can be configured to be bent by providing
As a result, the boiler according to the present invention can be freely designed in accordance with its capacity and the allowable dimensions and area of the installation place, so that a boiler with a very large degree of design freedom can be obtained. Of course, the water tube group panel in the width direction of the gas flow can be a basic module having the same structure and shape. Therefore, it is possible to design a modular water pipe boiler of appropriate size so that it is easy to carry in and install it on site, as well as to reduce the cost in the manufacturing process, and the assembly work can be made very easily and inexpensively. .

The portion where the combustion gas exits the tube group and bends, that is, the bent portion of the gas flow from which the water tube group shown in FIG. 2 (9a) is deleted, and (9a) in FIG.
In the bent part of the gas of (9c), a space is provided in the first half (exit of the first passage) by omitting a water pipe as shown in FIG. 2, and the space is used as a maintenance space for inspection and cleaning.
In the latter half (the entrance of the second passage), a water pipe group (2b) may be provided as a heat transfer surface, and these may be problems within the range of design freedom. However, as a result of research conducted by the present inventors, the bent portion of the gas and the bent portion of the gas (FIG. 4) and [ (9a) and (9) in FIG.
It is good to omit all the water tube groups as in a) and (9c).
Further, as shown in FIG. 5, it is preferable to provide a rectifying wall made of a refractory material or the like at (12a) and (12b) at the outer corners of the entrance side and the exit side of the part (9a). As a result of the study of the present inventors, it was found. Further, when the space is provided as described above, it is preferable to provide an opening through which the gas can be bent and to enter and exit from the space where the gas is bent. An example thereof is shown in FIG. 6 and FIG. (11) in FIG. 2 shows an exit smoke chamber wall made of the same refractory material as (8) in FIG. 4 and (12a) in FIG. FIG. 3 is a view taken along the line III-III of FIG. 1, and (7) is a burner.

FIG. 7 shows another embodiment of the present invention having a larger capacity, and is a view taken along the line VII-VII of FIG.
FIG. 8 is a view taken in the direction of arrows VIII-VIII of FIG. 6, and the mounting shape of the burner (7) is different between FIG. 8 and FIG. 3, but there is no other difference.

FIG. 9 is a schematic diagram showing the direction of the zigzag flow of the combustion gas only in the horizontal direction, and FIG. 10 is a diagram in which the combustion gas flows first in the horizontal direction, then in the vertical direction, and further in the upper horizontal direction. It is a schematic diagram similarly showing the direction of a zigzag flow when it is discharged as exhaust gas.

[0031]

The effects of the present invention are summarized as follows. (A) The present invention provides a water tube boiler in which the fuel is burned in a group of water tubes to eliminate a large-sized combustion chamber as in the prior art, and the combustion chamber is constituted only by the group of water tubes. Thus, a modular water pipe boiler has been achieved which is remarkably compact as compared with the water pipe boiler described above, and in which the water pipe is not burned even under high load combustion. (B) In the tube nest combustion water tube group and the downstream contact water tube group according to the present invention, the flow direction of the combustion gas is appropriately bent, and the water tube row in the flow direction of the combustion gas is formed in one water tube panel. What is a basic element, an appropriate number of the basic elements are grouped by each header in the width direction,
By constructing a basic module consisting of a number of water pipe groups that constitute the basic elements put together in each header, the combustion chamber water pipe group and the contact water pipe group following it are made to have the same module configuration, thus Therefore, in the present invention, the passage of the combustion gas does not necessarily have to be straight, and the passage of the combustion gas may be made uneven according to other conditions as necessary, or by forming a bent portion at an appropriate place. Thus, a modular water tube boiler that can be freely designed in accordance with the allowable installation space as a boiler can be obtained. (C) By doing so, the heat load distribution of the water pipes of each panel becomes the same, and therefore the flow distribution of the water pipes and the two-phase flow becomes the same, and the design of the basic element or the basic module constituted by each water pipe is made. It was done simply and safely. (D) Similarly, by configuring the basic module in this manner, it is possible to replace a part of the boiler for each basic element or each basic module, as well as for repair. Further, even when the capacity of the boiler of the present invention needs to be changed, it can be easily removed or added for each basic element or each basic module. (E) In the tube nest combustion water tube group and the contact water tube group of the present invention, a basic element composed of a water tube group in the flow direction of the combustion gas, and an appropriate number of the basic elements composed of the water tube group are respectively combined by a header into a basic module. As a result, production at a manufacturing plant, transport to an installation site, installation, and assembly are greatly facilitated, installation time is shortened, and costs are easily reduced.

[Brief description of the drawings]

FIG. 1 is a side view of one embodiment of a modular water tube boiler of the present invention.

FIG. 2 is a view taken along the line II-II in FIG.

FIG. 3 is a view taken in the direction of arrows III-III in FIG. 1;

FIG. 4 is an improved view of FIG. 2;

FIG. 5 is a further improved view thereof.

FIG. 6 is a side view of another embodiment of the present invention.

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 6;

FIG. 8 is a view taken along the line VIII-VIII in FIG. 6;

FIG. 9 is a diagram showing a zigzag flow direction of a combustion gas only in a horizontal direction.

FIG. 10 is a view showing a flow direction flowing in a horizontal direction and a vertical direction.

[Explanation of symbols]

1a, 1b, 1c, 1d. Water tube membrane wall 1e. Horizontal partition 2a, 2b, 2c. 2d. Water tube group 3a, 3b. Upper and lower collecting pipes 3c, 3d. Steam and water header 4a, 4b. Steam connection pipe 4c. Downcomer 5. Steam drum 6. Boiler casing 7. Burner 8,11. Refractory walls 9a, 9c. Combustion gas bend 10. Exhaust gas outlets 12a, 12b. Rectifier wall 13. Manhole 20. Flange or welding for modular water tube boiler assembly

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kara Keira 1-9-36 Oyodo-kita, Kita-ku, Osaka-shi Inside the Hirakawagaidam Co., Ltd. (72) Inventor Masanari Kinoshita 1-9-1, Oyodokita, Kita-ku, Osaka-shi No. 36 Inside the Hirakawa Guy Dam (72) Inventor Kaminashi Atsumi 1-9-36 Oyodo Kita, Kita-ku, Osaka-shi Inside the Hirakawa Guy Dam (72) Inventor Kiyotake Ishitani 8 Iwazonocho, Ashiya-shi, Hyogo No. 7 (56) References JP-A-3-260501 (JP, A) JP-A-59-23501 (JP, U) JP-A-1-67402 (JP, U)

Claims (3)

(57) [Claims] In a water tube boiler in which the entire boiler is constituted by a group of water tubes, fuel burns in front of the group of water tubes, and the downstream water tube group becomes a contact heat transfer water tube group. The passage is formed by being bent a plurality of times in a horizontal direction and / or a vertical direction at any desired position, and a single water pipe in a flow direction of the combustion gas is collectively formed in a panel shape at the front and rear portions of the passage. An appropriate number of the basic elements are combined by one header to form a basic module, and the desired number of the basic modules combined in the header is arbitrarily set to one or more headers, one or more on the water side and steam. Attached to the side connecting pipe, the basic module and the basic module are similar in shape and configuration by collecting several basic modules irrespective of the combustion section of the water pipe group and the subsequent contact section. One or more of the basic modules are mounted by means of water pipes and steam-side connecting pipes, and the basic elements and the shape of the basic modules are independent of the combustion section of the group of water pipes and the subsequent contact sections, A modular water pipe boiler comprising a configuration in which several basic modules are assembled, and one or more of the basic modules are connected to a drum by a flange or welding of a connecting pipe. 2. A modular water tube boiler according to claim 1, wherein a gas passage is provided by partially removing a water tube as a basic element at a bent portion of the boiler combustion gas. 3. The modular water pipe according to claim 2, wherein a rectifying slope is provided at an outer corner of the hot gas passage where a water pipe as a basic element is partially removed at a bent portion of the boiler combustion gas. boiler.