WAVY SMOKE TUBE STRUCTURE OF BOILER

Abstract

The present disclosure relates to a wavy smoke tube structure of a boiler, which improves heat exchange efficiency of a smoke tube. The wavy smoke tube structure includes: a main body formed in a columnar shape and having a space therein; a plurality of first concave portions concavely formed along a first side portion in a longitudinal direction of the main body; a plurality of second concave portions concavely formed along a second side portion in the longitudinal direction of the main body opposite to the first side portion and each positioned between a pair of the first concave portions to face them; and a plurality of blocking grooves formed in a pair of sidewall portions provided between the first side portion and the second side portion.

Claims

1. A wavy smoke tube structure of a boiler, comprising: a main body formed in a columnar shape and having a space therein; a plurality of first concave portions concavely formed along a first side portion in a longitudinal direction of the main body; a plurality of second concave portions concavely formed along a second side portion in the longitudinal direction of the main body opposite to the first side portion and each positioned between a pair of the first concave portions to face them; and a plurality of blocking grooves formed in a pair of sidewall portions provided between the first side portion and the second side portion.

2. The wavy smoke tube structure of claim 1, wherein the sidewall portions include a first sidewall portion provided on one longitudinal side between the first side portion and the second side portion, and a second sidewall portion provided on the other longitudinal side between the first side portion and the second side portion, a center of each of the second concave portions is positioned between opposite ends of the plurality of first concave portions to face them, and the plurality of the blocking grooves are formed along the longitudinal direction of the first sidewall portion and the second sidewall portion, and are concavely formed between the opposite ends of the plurality of first concave portions and the center of each of the second concave portions.

3. The wavy smoke tube structure of claim 2, wherein each of the blocking grooves is concavely formed in a hemispherical shape.

4. The wavy smoke tube structure of claim 1, further comprising: a concave end portion formed concavely at one end of a pair of sidewall portions.

5. The wavy smoke tube structure of claim 4, wherein a diameter between the pair of sidewall portions becomes smaller by the concave end portion as it goes toward ends of the sidewall portions.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG. 1 is a diagram illustrating a conventional boiler.

[0018] FIG. 2 is a perspective view illustrating a smoke tube applied to the conventional boiler.

[0019] FIG. 3 is a side view illustrating the smoke tube applied to the conventional boiler.

[0020] FIG. 4 is a perspective view illustrating a flow analysis of fluid over time in the smoke tube applied to the conventional boiler.

[0021] FIG. 5 is a side view illustrating a flow analysis of fluid over time in the smoke tube applied to the conventional boiler.

[0022] FIG. 6 is a perspective view schematically illustrating a wavy smoke tube structure of a boiler according to one embodiment of the present disclosure.

[0023] FIG. 7 is a cross-sectional view taken along line A-A′ of FIG. 6.

[0024] FIG. 8 is a plan view schematically illustrating the wavy smoke tube structure of the boiler according to one embodiment of the present disclosure.

[0025] FIG. 9 is a side view schematically illustrating the wavy smoke tube structure of the boiler according to one embodiment of the present disclosure.

[0026] FIG. 10 is a cross-sectional view taken along line B-B′ of FIG. 9.

[0027] FIG. 11 is a cross-sectional view taken along line C-C′ of FIG. 9.

[0028] FIG. 12 is a perspective view illustrating a flow analysis of a fluid over time of the wavy smoke tube structure of the boiler according to one embodiment of the present disclosure.

[0029] FIG. 13 is a side view illustrating a flow analysis of a fluid over time of the wavy smoke tube structure of the boiler according to one embodiment of the present disclosure.

DESCRIPTION OF REFERENCE NUMERALS

[0030]

TABLE-US-00001 100: smoke tube 110: main body 111: first side portion 112: second side portion 113: first sidewall portion 114: second sidewall portion 120: first concave portion 122: second concave portion 130: blocking groove 140: concave end portion

DESCRIPTION OF EXEMPLARY EMBODIMENTS

[0031] Hereinafter, a wavy smoke tube structure of a boiler according to one embodiment of the present disclosure will be described in more detail with reference to the accompanying drawings.

[0032] FIG. 6 is a perspective view schematically illustrating a wavy smoke tube structure of a boiler according to one embodiment of the present disclosure, and FIG. 7 is a cross-sectional view taken along line A-A′ of FIG. 6.

[0033] Referring to FIGS. 6 and 7, the wavy smoke tube of the boiler according to the embodiment of the present disclosure includes a smoke tube 100, and the smoke tube 100 includes a main body 110, first and second concave portions 120, 122, a blocking groove 130 and a concave end portion 140.

[0034] The smoke tube 100 is configured as a passage through which combustion gas generated from a burner of the boiler moves, and external direct water supplied to the boiler is heat-exchanged to be hot water while coming into contact with the smoke tube 100. As the combustion gas moves slowly, more heat of the combustion gas is transferred to the smoke tube 100, so that the heat exchange efficiency of the smoke tube 100 is improved.

[0035] The main body 110 is to form an appearance of the smoke tube 100, is formed in a long column shape and includes an empty space therein. The combustion gas of the burner is moved from one end in the longitudinal direction of the main body 110 to the other end through the empty space inside the main body 110. The main body 110 is provided with a first side portion 111 on one longitudinal side, and a second side portion 112 is provided on the other longitudinal side of the main body 110 which is opposite to the first side portion 111, a first sidewall portion 113 is provided on one longitudinal side between the first side portion 111 and the second side portion 112, and a second sidewall portion 114 is provided on the other longitudinal side between the first side portion 111 and the second side portion 112.

[0036] FIG. 8 is a plan view schematically illustrating the wavy smoke tube structure of the boiler according to one embodiment of the present disclosure, and FIG. 9 is a side view schematically illustrating the wavy smoke tube structure of the boiler according to one embodiment of the present disclosure.

[0037] Referring to FIGS. 6 to 9, a plurality of first concave portions 120 are formed in a wavy shape along the longitudinal direction of the first side portion 111. The first concave portions 120 are arranged in series with each other, and a pair of first concave portions 120 facing each other is spaced apart from each other. A plurality of second concave portions 122 are formed in a wavy shape along the longitudinal direction of the second side portion 112. The second concave portions 122 are arranged in series with each other, and a pair of second concave portions 122 facing each other is spaced apart from each other. In this case, the second concave portion 122 is positioned between the pair of first concave portions 120 to face them, and the center of the second concave portion 122 is positioned between the opposite ends of the plurality of first concave portions 120 to face them.

[0038] A plurality of blocking grooves 130 are formed along the longitudinal direction of the first sidewall portion 113 and the second sidewall portion 114, and the blocking grooves 130 are concavely formed between the opposite ends of the plurality of first concave portions 120 and the center of the second concave portions 122. The blocking groove 130 is concavely formed in a hemispherical shape. In addition, a diameter between the opposite ends of the pair of first concave portions 120 and the center of the second concave portion 122 becomes smaller by the blocking groove 130.

[0039] The concave end portion 140 is concavely formed at one end of the pair of sidewall portions. A diameter between the first and second sidewall portions 113 and 114 becomes smaller by the concave end portion 140 as it goes toward the ends of the first and second sidewall portions 113 and 114.

[0040] FIG. 10 is a cross-sectional view taken along line B-B′ of FIG. 9, and FIG. 11 is a cross-sectional view taken along line C-C′ of FIG. 9.

[0041] Referring to FIGS. 6 to 11, a diameter d2 between the pair of blocking grooves 130 provided in the first and second sidewall portions 113 and 114 is configured to be smaller than a diameter d1 between the first and second sidewall portions 113 and 114 without the pair of blocking grooves 130. Accordingly, the flame moving along the smoke tube 100 moves more slowly while being blocked by the blocking grooves 130.

[0042] In addition, a diameter d4 between the pair of concave end portions 140 provided in the first and second sidewall portions 113 and 114 is configured to be smaller than a diameter d3 between the first and second sidewall portions 113 without the pair of concave end portions 140. Accordingly, the flame moving along the smoke tube 100 moves more slowly while being blocked by the concave end portions 140.

[0043] FIG. 12 is a perspective view illustrating a flow analysis of a fluid over time of the wavy smoke tube structure of the boiler according to one embodiment of the present disclosure, and FIG. 13 is a side view illustrating a flow analysis of a fluid over time of the wavy smoke tube structure of the boiler according to one embodiment of the present disclosure.

[0044] Referring to FIGS. 4 to 13, the flow rate of the fluid inserted into the smoke tube 100 increases as it passes through a narrow passage, and decreases as it passes through a wide passage, according to Bernoulli's principle. Based on this rule, first, referring to FIGS. 4 and 5, it can be seen that the flow rate of the fluid relatively increases in the central portion of the first and second concave portions 15a and 15b.

[0045] Then, referring to FIGS. 12 and 13, it can be seen that the flow rate of the fluid in the central portion of the first and second concave portions 120 and 122 relatively increases, and the flow rate of the fluid around both ends of the pair of first concave portions 120 also relatively increases. This means that, due to the blocking groove 130 formed between both ends of the pair of first concave portions 120 and the center of the second concave portion 122, a diameter around the blocking groove 130 becomes relatively small. Accordingly, the flame moving along the smoke tube 100 stays longer around the blocking groove 130, which results in more efficient transfer of the heat of the flame to the smoke tube 100.

[0046] In addition, it can be seen that the flow rate of the fluid relatively increases even around the concave end portion 140. This means that, due to the pair of concave end portions 140, a diameter of the smoke tube 100 around the concave end portion 140 becomes relatively small, and accordingly, the flame moving along the smoke tube 100 stays longer around the concave end portion 140, which results in more efficient transfer of the heat of the flame to the smoke tube 100.

[0047] Although the present disclosure has been described in detail in the above embodiments, it goes without saying that the present disclosure is not limited thereto, and it is apparent to those skilled in the art that various changes and modifications may be made within the scope of the technical spirit of the present disclosure, and these variations and modifications fall within the scope of the appended claims, the technical idea should also be regarded as belonging to the present disclosure.